1 /*
2  * arch/arm/mach-sa1100/include/mach/memory.h
3  *
4  * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
5  */
6 
7 #ifndef __ASM_ARCH_MEMORY_H
8 #define __ASM_ARCH_MEMORY_H
9 
10 #include <asm/sizes.h>
11 
12 /*
13  * Physical DRAM offset is 0xc0000000 on the SA1100
14  */
15 #define PHYS_OFFSET	UL(0xc0000000)
16 
17 #ifndef __ASSEMBLY__
18 
19 #ifdef CONFIG_SA1111
20 void sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes);
21 
22 #define arch_adjust_zones(node, size, holes) \
23 	sa1111_adjust_zones(node, size, holes)
24 
25 #define ISA_DMA_THRESHOLD	(PHYS_OFFSET + SZ_1M - 1)
26 
27 #endif
28 #endif
29 
30 /*
31  * Virtual view <-> DMA view memory address translations
32  * virt_to_bus: Used to translate the virtual address to an
33  *		address suitable to be passed to set_dma_addr
34  * bus_to_virt: Used to convert an address for DMA operations
35  *		to an address that the kernel can use.
36  *
37  * On the SA1100, bus addresses are equivalent to physical addresses.
38  */
39 #define __virt_to_bus(x)	 __virt_to_phys(x)
40 #define __bus_to_virt(x)	 __phys_to_virt(x)
41 
42 /*
43  * Because of the wide memory address space between physical RAM banks on the
44  * SA1100, it's much convenient to use Linux's NUMA support to implement our
45  * memory map representation.  Assuming all memory nodes have equal access
46  * characteristics, we then have generic discontiguous memory support.
47  *
48  * Of course, all this isn't mandatory for SA1100 implementations with only
49  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
50  *
51  * The nodes are matched with the physical memory bank addresses which are
52  * incidentally the same as virtual addresses.
53  *
54  * 	node 0:  0xc0000000 - 0xc7ffffff
55  * 	node 1:  0xc8000000 - 0xcfffffff
56  * 	node 2:  0xd0000000 - 0xd7ffffff
57  * 	node 3:  0xd8000000 - 0xdfffffff
58  */
59 #define NODE_MEM_SIZE_BITS	27
60 
61 /*
62  * Cache flushing area - SA1100 zero bank
63  */
64 #define FLUSH_BASE_PHYS		0xe0000000
65 #define FLUSH_BASE		0xf5000000
66 #define FLUSH_BASE_MINICACHE	0xf5100000
67 
68 #endif
69