ARM: dma-mapping: provide dma_to_page()

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-By: Jamie Iles <jamie@jamieiles.com>

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 5d78eb1..f06d80c 100644 (file)
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -20,6 +20,11 @@ static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
        return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
 }
 
+static inline struct page *dma_to_page(struct device *dev, dma_addr_t addr)
+{
+       return pfn_to_page(__bus_to_pfn(addr));
+}
+
 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 {
        return (void *)__bus_to_virt(addr);
@@ -35,6 +40,11 @@ static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
        return __arch_page_to_dma(dev, page);
 }
 
+static inline struct page *dma_to_page(struct device *dev, dma_addr_t addr)
+{
+       return __arch_dma_to_page(dev, addr);
+}
+
 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 {
        return __arch_dma_to_virt(dev, addr);

diff --git a/arch/arm/mach-iop13xx/include/mach/memory.h b/arch/arm/mach-iop13xx/include/mach/memory.h
index 42ae29b..25b1da9 100644 (file)
--- a/arch/arm/mach-iop13xx/include/mach/memory.h
+++ b/arch/arm/mach-iop13xx/include/mach/memory.h
@@ -64,6 +64,8 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x)
                (dma_addr_t)page_to_phys(page);                         \
        })
 
+#define __arch_dma_to_page(dev, addr)  phys_to_page(addr)
+
 #endif /* CONFIG_ARCH_IOP13XX */
 #endif /* !ASSEMBLY */
 

diff --git a/arch/arm/mach-ks8695/include/mach/memory.h b/arch/arm/mach-ks8695/include/mach/memory.h
index 76e5308..ffa19aa 100644 (file)
--- a/arch/arm/mach-ks8695/include/mach/memory.h
+++ b/arch/arm/mach-ks8695/include/mach/memory.h
@@ -41,6 +41,13 @@ extern struct bus_type platform_bus_type;
                __dma = __dma - PHYS_OFFSET + KS8695_PCIMEM_PA; \
           __dma; })
 
+#define __arch_dma_to_page(dev, x)     \
+       ({ dma_addr_t __dma = x;                                \
+          if (!is_lbus_device(dev))                            \
+               __dma += PHYS_OFFSET - KS8695_PCIMEM_PA;        \
+          phys_to_page(__dma);                                 \
+       })
+
 #endif
 
 #endif

diff --git a/arch/arm/plat-omap/include/mach/memory.h b/arch/arm/plat-omap/include/mach/memory.h
index 9ad41dc..3325f7b 100644 (file)
--- a/arch/arm/plat-omap/include/mach/memory.h
+++ b/arch/arm/plat-omap/include/mach/memory.h
@@ -68,6 +68,13 @@
                __dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \
           __dma; })
 
+#define __arch_dma_to_page(dev, addr)  \
+       ({ dma_addr_t __dma = addr;                             \
+          if (is_lbus_device(dev))                             \
+               __dma += PHYS_OFFSET - OMAP1510_LB_OFFSET;      \
+          phys_to_page(__dma);                                 \
+       })
+
 #define __arch_dma_to_virt(dev, addr)  ({ (void *) (is_lbus_device(dev) ? \
                                                lbus_to_virt(addr) : \
                                                __phys_to_virt(addr)); })