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 extern unsigned long __pfn_to_bus(unsigned long);
33 extern unsigned long __bus_to_pfn(unsigned long);
34 #endif
35 #define __virt_to_bus	__virt_to_bus
36 #define __bus_to_virt	__bus_to_virt
37 
38 #elif defined(CONFIG_FOOTBRIDGE_HOST)
39 
40 /*
41  * The footbridge is programmed to expose the system RAM at 0xe0000000.
42  * The requirement is that the RAM isn't placed at bus address 0, which
43  * would clash with VGA cards.
44  */
45 #define BUS_OFFSET		0xe0000000
46 #define __virt_to_bus(x)	((x) + (BUS_OFFSET - PAGE_OFFSET))
47 #define __bus_to_virt(x)	((x) - (BUS_OFFSET - PAGE_OFFSET))
48 #define __pfn_to_bus(x)		(__pfn_to_phys(x) + (BUS_OFFSET - PHYS_OFFSET))
49 #define __bus_to_pfn(x)		__phys_to_pfn((x) - (BUS_OFFSET - PHYS_OFFSET))
50 
51 #else
52 
53 #error "Undefined footbridge mode"
54 
55 #endif
56 
57 /*
58  * Cache flushing area.
59  */
60 #define FLUSH_BASE		0xf9000000
61 
62 /*
63  * Physical DRAM offset.
64  */
65 #define PLAT_PHYS_OFFSET		UL(0x00000000)
66 
67 #define FLUSH_BASE_PHYS		0x50000000
68 
69 #endif
70