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-rw-r--r--arch/arm/include/asm/io.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 9db072df2b3d..3c91e7c80c29 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -26,6 +26,7 @@
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/memory.h>
+#include <asm/system.h>
/*
* ISA I/O bus memory addresses are 1:1 with the physical address.
@@ -191,6 +192,15 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
#define writel_relaxed(v,c) ((void)__raw_writel((__force u32) \
cpu_to_le32(v),__mem_pci(c)))
+#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
+#define readb(c) ({ u8 __v = readb_relaxed(c); rmb(); __v; })
+#define readw(c) ({ u16 __v = readw_relaxed(c); rmb(); __v; })
+#define readl(c) ({ u32 __v = readl_relaxed(c); rmb(); __v; })
+
+#define writeb(v,c) ({ wmb(); writeb_relaxed(v,c); })
+#define writew(v,c) ({ wmb(); writew_relaxed(v,c); })
+#define writel(v,c) ({ wmb(); writel_relaxed(v,c); })
+#else
#define readb(c) readb_relaxed(c)
#define readw(c) readw_relaxed(c)
#define readl(c) readl_relaxed(c)
@@ -198,6 +208,7 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
#define writeb(v,c) writeb_relaxed(v,c)
#define writew(v,c) writew_relaxed(v,c)
#define writel(v,c) writel_relaxed(v,c)
+#endif
#define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
#define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)