1 files changed, 108 insertions, 0 deletions
diff --git a/include/asm-arm/arch-sa1100/memory.h b/include/asm-arm/arch-sa1100/memory.h
new file mode 100644
index 000000000000..32d3d5bde34d
--- /dev/null
+++ b/include/asm-arm/arch-sa1100/memory.h
@@ -0,0 +1,108 @@
+/*
+ * linux/include/asm-arm/arch-sa1100/memory.h
+ *
+ * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
+ */
+
+#ifndef __ASM_ARCH_MEMORY_H
+#define __ASM_ARCH_MEMORY_H
+
+#include <linux/config.h>
+#include <asm/sizes.h>
+
+/*
+ * Physical DRAM offset is 0xc0000000 on the SA1100
+ */
+#define PHYS_OFFSET	(0xc0000000UL)
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_SA1111
+static inline void
+__arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
+{
+	unsigned int sz = SZ_1M >> PAGE_SHIFT;
+
+	if (node != 0)
+		sz = 0;
+
+	size[1] = size[0] - sz;
+	size[0] = sz;
+}
+
+#define arch_adjust_zones(node, size, holes) \
+	__arch_adjust_zones(node, size, holes)
+
+#define ISA_DMA_THRESHOLD	(PHYS_OFFSET + SZ_1M - 1)
+
+#endif
+#endif
+
+/*
+ * Virtual view <-> DMA view memory address translations
+ * virt_to_bus: Used to translate the virtual address to an
+ *		address suitable to be passed to set_dma_addr
+ * bus_to_virt: Used to convert an address for DMA operations
+ *		to an address that the kernel can use.
+ *
+ * On the SA1100, bus addresses are equivalent to physical addresses.
+ */
+#define __virt_to_bus(x)	 __virt_to_phys(x)
+#define __bus_to_virt(x)	 __phys_to_virt(x)
+
+#ifdef CONFIG_DISCONTIGMEM
+/*
+ * Because of the wide memory address space between physical RAM banks on the 
+ * SA1100, it's much convenient to use Linux's NUMA support to implement our 
+ * memory map representation.  Assuming all memory nodes have equal access 
+ * characteristics, we then have generic discontiguous memory support.
+ *
+ * Of course, all this isn't mandatory for SA1100 implementations with only
+ * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
+ *
+ * The nodes are matched with the physical memory bank addresses which are 
+ * incidentally the same as virtual addresses.
+ * 
+ * 	node 0:  0xc0000000 - 0xc7ffffff
+ * 	node 1:  0xc8000000 - 0xcfffffff
+ * 	node 2:  0xd0000000 - 0xd7ffffff
+ * 	node 3:  0xd8000000 - 0xdfffffff
+ */
+
+/*
+ * Given a kernel address, find the home node of the underlying memory.
+ */
+#define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
+
+/*
+ * Given a page frame number, convert it to a node id.
+ */
+#define PFN_TO_NID(pfn)		(((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
+
+/*
+ * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
+ * and return the mem_map of that node.
+ */
+#define ADDR_TO_MAPBASE(kaddr)	NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
+
+/*
+ * Given a page frame number, find the owning node of the memory
+ * and return the mem_map of that node.
+ */
+#define PFN_TO_MAPBASE(pfn)	NODE_MEM_MAP(PFN_TO_NID(pfn))
+
+/*
+ * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
+ * and returns the index corresponding to the appropriate page in the
+ * node's mem_map.
+ */
+#define LOCAL_MAP_NR(addr) \
+	(((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
+
+#else
+
+#define PFN_TO_NID(addr)	(0)
+
+#endif
+
+#endif