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