1 /*
2 * arch/arm/mach-footbridge/include/mach/memory.h
3 *
4 * Copyright (C) 1996-1999 Russell King.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Changelog:
11 * 20-Oct-1996 RMK Created
12 * 31-Dec-1997 RMK Fixed definitions to reduce warnings.
13 * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions.
14 * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros.
15 * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture.
16 * Renamed to memory.h
17 * Moved PAGE_OFFSET and TASK_SIZE here
18 */
19 #ifndef __ASM_ARCH_MEMORY_H
20 #define __ASM_ARCH_MEMORY_H
21
22
23 #if defined(CONFIG_FOOTBRIDGE_ADDIN)
24 /*
25 * If we may be using add-in footbridge mode, then we must
26 * use the out-of-line translation that makes use of the
27 * PCI BAR
28 */
29 #ifndef __ASSEMBLY__
30 extern unsigned long __virt_to_bus(unsigned long);
31 extern unsigned long __bus_to_virt(unsigned long);
32 #endif
33 #define __virt_to_bus __virt_to_bus
34 #define __bus_to_virt __bus_to_virt
35
36 #elif defined(CONFIG_FOOTBRIDGE_HOST)
37
38 /*
39 * The footbridge is programmed to expose the system RAM at the corresponding
40 * address. So, if PAGE_OFFSET is 0xc0000000, RAM appears at 0xe0000000.
41 * If 0x80000000, then its exposed at 0xa0000000 on the bus. etc.
42 * The only requirement is that the RAM isn't placed at bus address 0 which
43 * would clash with VGA cards.
44 */
45 #define __virt_to_bus(x) ((x) - 0xe0000000)
46 #define __bus_to_virt(x) ((x) + 0xe0000000)
47
48 #else
49
50 #error "Undefined footbridge mode"
51
52 #endif
53
54 /*
55 * Cache flushing area.
56 */
57 #define FLUSH_BASE 0xf9000000
58
59 /*
60 * Physical DRAM offset.
61 */
62 #define PHYS_OFFSET UL(0x00000000)
63
64 #define FLUSH_BASE_PHYS 0x50000000
65
66 #endif
67
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