1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/mach-realview/include/mach/memory.h b/arch/arm/mach-realview/include/mach/memory.h
index 293c30025e7..2417bbcf97f 100644
--- a/arch/arm/mach-realview/include/mach/memory.h
+++ b/arch/arm/mach-realview/include/mach/memory.h
@@ -29,4 +29,53 @@
 #define PHYS_OFFSET		UL(0x00000000)
 #endif
 
+#if !defined(__ASSEMBLY__) && defined(CONFIG_ZONE_DMA)
+extern void realview_adjust_zones(int node, unsigned long *size,
+				  unsigned long *hole);
+#define arch_adjust_zones(node, size, hole) \
+	realview_adjust_zones(node, size, hole)
+
+#define ISA_DMA_THRESHOLD	(PHYS_OFFSET + SZ_256M - 1)
+#define MAX_DMA_ADDRESS		(PAGE_OFFSET + SZ_256M)
+#endif
+
+#ifdef CONFIG_SPARSEMEM
+
+/*
+ * Sparsemem definitions for RealView PBX.
+ *
+ * The RealView PBX board has another block of 512MB of RAM at 0x20000000,
+ * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000)
+ * may be used for DMA.
+ *
+ * The macros below define a section size of 256MB and a non-linear virtual to
+ * physical mapping:
+ *
+ * 256MB @ 0x00000000 -> PAGE_OFFSET
+ * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000
+ * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000
+ */
+#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
+#error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET"
+#endif
+
+#define MAX_PHYSMEM_BITS	32
+#define SECTION_SIZE_BITS	28
+
+/* bank page offsets */
+#define PAGE_OFFSET1	(PAGE_OFFSET + 0x10000000)
+#define PAGE_OFFSET2	(PAGE_OFFSET + 0x30000000)
+
+#define __phys_to_virt(phys)						\
+	((phys) >= 0x80000000 ?	(phys) - 0x80000000 + PAGE_OFFSET2 :	\
+	 (phys) >= 0x20000000 ?	(phys) - 0x20000000 + PAGE_OFFSET1 :	\
+	 (phys) + PAGE_OFFSET)
+
+#define __virt_to_phys(virt)						\
+	 ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 :	\
+	  (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 :	\
+	  (virt) - PAGE_OFFSET)
+
+#endif	/* CONFIG_SPARSEMEM */
+
 #endif