1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/mach-footbridge/include/mach/memory.h 4 * 5 * Copyright (C) 1996-1999 Russell King. 6 * 7 * Changelog: 8 * 20-Oct-1996 RMK Created 9 * 31-Dec-1997 RMK Fixed definitions to reduce warnings. 10 * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions. 11 * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros. 12 * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture. 13 * Renamed to memory.h 14 * Moved PAGE_OFFSET and TASK_SIZE here 15 */ 16 #ifndef __ASM_ARCH_MEMORY_H 17 #define __ASM_ARCH_MEMORY_H 18 19 20 #if defined(CONFIG_FOOTBRIDGE_ADDIN) 21 /* 22 * If we may be using add-in footbridge mode, then we must 23 * use the out-of-line translation that makes use of the 24 * PCI BAR 25 */ 26 #ifndef __ASSEMBLY__ 27 extern unsigned long __virt_to_bus(unsigned long); 28 extern unsigned long __bus_to_virt(unsigned long); 29 extern unsigned long __pfn_to_bus(unsigned long); 30 extern unsigned long __bus_to_pfn(unsigned long); 31 #endif 32 #define __virt_to_bus __virt_to_bus 33 #define __bus_to_virt __bus_to_virt 34 35 #elif defined(CONFIG_FOOTBRIDGE_HOST) 36 37 /* 38 * The footbridge is programmed to expose the system RAM at 0xe0000000. 39 * The requirement is that the RAM isn't placed at bus address 0, which 40 * would clash with VGA cards. 41 */ 42 #define BUS_OFFSET 0xe0000000 43 #define __virt_to_bus(x) ((x) + (BUS_OFFSET - PAGE_OFFSET)) 44 #define __bus_to_virt(x) ((x) - (BUS_OFFSET - PAGE_OFFSET)) 45 #define __pfn_to_bus(x) (__pfn_to_phys(x) + (BUS_OFFSET - PHYS_OFFSET)) 46 #define __bus_to_pfn(x) __phys_to_pfn((x) - (BUS_OFFSET - PHYS_OFFSET)) 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 #define FLUSH_BASE_PHYS 0x50000000 60 61 #endif 62