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__ 30extern unsigned long __virt_to_bus(unsigned long); 31extern unsigned long __bus_to_virt(unsigned long); 32extern unsigned long __pfn_to_bus(unsigned long); 33extern 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 PHYS_OFFSET UL(0x00000000) 66 67#define FLUSH_BASE_PHYS 0x50000000 68 69#endif 70