1/* 2 * arch/arm/mach-clps711x/include/mach/memory.h 3 * 4 * Copyright (C) 1999 ARM Limited 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 as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20#ifndef __ASM_ARCH_MEMORY_H 21#define __ASM_ARCH_MEMORY_H 22 23/* 24 * Physical DRAM offset. 25 */ 26#define PHYS_OFFSET UL(0xc0000000) 27 28#if !defined(CONFIG_ARCH_CDB89712) && !defined(CONFIG_ARCH_AUTCPU12) 29 30#define __virt_to_bus(x) ((x) - PAGE_OFFSET) 31#define __bus_to_virt(x) ((x) + PAGE_OFFSET) 32#define __pfn_to_bus(x) (__pfn_to_phys(x) - PHYS_OFFSET) 33#define __bus_to_pfn(x) __phys_to_pfn((x) + PHYS_OFFSET) 34 35#endif 36 37 38/* 39 * Like the SA1100, the EDB7211 has a large gap between physical RAM 40 * banks. In 2.2, the Psion (CL-PS7110) port added custom support for 41 * discontiguous physical memory. In 2.4, we can use the standard 42 * Linux NUMA support. 43 * 44 * This is not necessary for EP7211 implementations with only one used 45 * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM. 46 */ 47 48/* 49 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211 50 * uses only one of the two banks (bank #1). However, even within 51 * bank #1, memory is discontiguous. 52 * 53 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between 54 * them, so we use 24 for the node max shift to get 16MB node sizes. 55 */ 56 57/* 58 * Because of the wide memory address space between physical RAM banks on the 59 * SA1100, it's much more convenient to use Linux's NUMA support to implement 60 * our memory map representation. Assuming all memory nodes have equal access 61 * characteristics, we then have generic discontiguous memory support. 62 * 63 * Of course, all this isn't mandatory for SA1100 implementations with only 64 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM. 65 * 66 * The nodes are matched with the physical memory bank addresses which are 67 * incidentally the same as virtual addresses. 68 * 69 * node 0: 0xc0000000 - 0xc7ffffff 70 * node 1: 0xc8000000 - 0xcfffffff 71 * node 2: 0xd0000000 - 0xd7ffffff 72 * node 3: 0xd8000000 - 0xdfffffff 73 */ 74#define SECTION_SIZE_BITS 24 75#define MAX_PHYSMEM_BITS 32 76 77#endif 78