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 #define FLUSH_BASE_PHYS 0x50000000 63 64 #endif 65