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wdenkb783eda2003-06-25 22:26:29 +00001/*
2 * linux/include/asm-arm/arch-s3c2400/memory.h by gj@denx.de
3 * based on
4 * linux/include/asm-arm/arch-sa1100/memory.h
5 *
6 * Copyright (c) 1999 Nicolas Pitre <nico@visuaide.com>
7 */
8
9#ifndef __ASM_ARCH_MEMORY_H
10#define __ASM_ARCH_MEMORY_H
11
12
13/*
14 * Task size: 3GB
15 */
16#define TASK_SIZE (0xc0000000UL)
17#define TASK_SIZE_26 (0x04000000UL)
18
19/*
20 * This decides where the kernel will search for a free chunk of vm
21 * space during mmap's.
22 */
23#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
24
25/*
26 * Page offset: 3GB
27 */
28#define PAGE_OFFSET (0xc0000000UL)
29
30/*
31 * Physical DRAM offset is 0x0c000000 on the S3C2400
32 */
33#define PHYS_OFFSET (0x0c000000UL)
34
35#include <linux/config.h>
36
37
38/* Modified for S3C2400, by chc, 20010509 */
39#define RAM_IN_BANK_0 32*1024*1024
40#define RAM_IN_BANK_1 0
41#define RAM_IN_BANK_2 0
42#define RAM_IN_BANK_3 0
43
44#define MEM_SIZE (RAM_IN_BANK_0+RAM_IN_BANK_1+RAM_IN_BANK_2+RAM_IN_BANK_3)
45
46
47/* translation macros */
48#define __virt_to_phys__is_a_macro
49#define __phys_to_virt__is_a_macro
50
51#if (RAM_IN_BANK_1 + RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
52
53#define __virt_to_phys(x) ( (x) - PAGE_OFFSET + 0x0c000000 )
54#define __phys_to_virt(x) ( (x) - 0x0c000000 + PAGE_OFFSET )
55
56#elif (RAM_IN_BANK_0 == RAM_IN_BANK_1) && \
57 (RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
58
59/* Two identical banks */
60#define __virt_to_phys(x) \
61 ( ((x) < PAGE_OFFSET+RAM_IN_BANK_0) ? \
62 ((x) - PAGE_OFFSET + _DRAMBnk0) : \
63 ((x) - PAGE_OFFSET - RAM_IN_BANK_0 + _DRAMBnk1) )
64#define __phys_to_virt(x) \
65 ( ((x)&0x07ffffff) + \
66 (((x)&0x08000000) ? PAGE_OFFSET+RAM_IN_BANK_0 : PAGE_OFFSET) )
67#else
68
69/* It's more efficient for all other cases to use the function call */
70#undef __virt_to_phys__is_a_macro
71#undef __phys_to_virt__is_a_macro
72extern unsigned long __virt_to_phys(unsigned long vpage);
73extern unsigned long __phys_to_virt(unsigned long ppage);
74
75#endif
76
77/*
78 * Virtual view <-> DMA view memory address translations
79 * virt_to_bus: Used to translate the virtual address to an
80 * address suitable to be passed to set_dma_addr
81 * bus_to_virt: Used to convert an address for DMA operations
82 * to an address that the kernel can use.
83 *
84 * On the SA1100, bus addresses are equivalent to physical addresses.
85 */
86#define __virt_to_bus__is_a_macro
87#define __virt_to_bus(x) __virt_to_phys(x)
88#define __bus_to_virt__is_a_macro
89#define __bus_to_virt(x) __phys_to_virt(x)
90
91
92#ifdef CONFIG_DISCONTIGMEM
93#error "CONFIG_DISCONTIGMEM will not work on S3C2400"
94/*
wdenk8bde7f72003-06-27 21:31:46 +000095 * Because of the wide memory address space between physical RAM banks on the
wdenkb783eda2003-06-25 22:26:29 +000096 * SA1100, it's much more convenient to use Linux's NUMA support to implement
wdenk8bde7f72003-06-27 21:31:46 +000097 * our memory map representation. Assuming all memory nodes have equal access
wdenkb783eda2003-06-25 22:26:29 +000098 * characteristics, we then have generic discontiguous memory support.
99 *
100 * Of course, all this isn't mandatory for SA1100 implementations with only
101 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
102 *
wdenk8bde7f72003-06-27 21:31:46 +0000103 * The nodes are matched with the physical memory bank addresses which are
wdenkb783eda2003-06-25 22:26:29 +0000104 * incidentally the same as virtual addresses.
wdenk8bde7f72003-06-27 21:31:46 +0000105 *
Wolfgang Denk53677ef2008-05-20 16:00:29 +0200106 * node 0: 0xc0000000 - 0xc7ffffff
107 * node 1: 0xc8000000 - 0xcfffffff
108 * node 2: 0xd0000000 - 0xd7ffffff
109 * node 3: 0xd8000000 - 0xdfffffff
wdenkb783eda2003-06-25 22:26:29 +0000110 */
111
112#define NR_NODES 4
113
114/*
115 * Given a kernel address, find the home node of the underlying memory.
116 */
117#define KVADDR_TO_NID(addr) \
118 (((unsigned long)(addr) - 0xc0000000) >> 27)
119
120/*
121 * Given a physical address, convert it to a node id.
122 */
123#define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr))
124
125/*
126 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
127 * and returns the mem_map of that node.
128 */
129#define ADDR_TO_MAPBASE(kaddr) \
130 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
131
132/*
133 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
134 * and returns the index corresponding to the appropriate page in the
135 * node's mem_map.
136 */
137#define LOCAL_MAP_NR(kvaddr) \
138 (((unsigned long)(kvaddr) & 0x07ffffff) >> PAGE_SHIFT)
139
140/*
wdenk8bde7f72003-06-27 21:31:46 +0000141 * Given a kaddr, virt_to_page returns a pointer to the corresponding
wdenkb783eda2003-06-25 22:26:29 +0000142 * mem_map entry.
143 */
144#define virt_to_page(kaddr) \
145 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
146
147/*
148 * VALID_PAGE returns a non-zero value if given page pointer is valid.
149 * This assumes all node's mem_maps are stored within the node they refer to.
150 */
151#define VALID_PAGE(page) \
152({ unsigned int node = KVADDR_TO_NID(page); \
153 ( (node < NR_NODES) && \
154 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \
155})
156
157#else
158
159#define PHYS_TO_NID(addr) (0)
160
161#endif
162#endif /* __ASM_ARCH_MEMORY_H */