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-rw-r--r--include/asm-arm/io.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-arm/io.h b/include/asm-arm/io.h
index 47c18e7..029b7f9 100644
--- a/include/asm-arm/io.h
+++ b/include/asm-arm/io.h
@@ -34,6 +34,32 @@ static inline void sync(void)
}
/*
+ * Given a physical address and a length, return a virtual address
+ * that can be used to access the memory range with the caching
+ * properties specified by "flags".
+ */
+typedef unsigned long phys_addr_t;
+
+#define MAP_NOCACHE (0)
+#define MAP_WRCOMBINE (0)
+#define MAP_WRBACK (0)
+#define MAP_WRTHROUGH (0)
+
+static inline void *
+map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
+{
+ return (void *)paddr;
+}
+
+/*
+ * Take down a mapping set up by map_physmem().
+ */
+static inline void unmap_physmem(void *vaddr, unsigned long flags)
+{
+
+}
+
+/*
* Generic virtual read/write. Note that we don't support half-word
* read/writes. We define __arch_*[bl] here, and leave __arch_*w
* to the architecture specific code.