| /* |
| * arch/arm/mach-clps711x/include/mach/memory.h |
| * |
| * Copyright (C) 1999 ARM Limited |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #ifndef __ASM_ARCH_MEMORY_H |
| #define __ASM_ARCH_MEMORY_H |
| |
| |
| /* |
| * Physical DRAM offset. |
| */ |
| #define PHYS_OFFSET UL(0xc0000000) |
| |
| /* |
| * Virtual view <-> DMA view memory address translations |
| * virt_to_bus: Used to translate the virtual address to an |
| * address suitable to be passed to set_dma_addr |
| * bus_to_virt: Used to convert an address for DMA operations |
| * to an address that the kernel can use. |
| */ |
| |
| #if defined(CONFIG_ARCH_CDB89712) |
| |
| #define __virt_to_bus(x) (x) |
| #define __bus_to_virt(x) (x) |
| |
| #elif defined (CONFIG_ARCH_AUTCPU12) |
| |
| #define __virt_to_bus(x) (x) |
| #define __bus_to_virt(x) (x) |
| |
| #else |
| |
| #define __virt_to_bus(x) ((x) - PAGE_OFFSET) |
| #define __bus_to_virt(x) ((x) + PAGE_OFFSET) |
| |
| #endif |
| |
| |
| /* |
| * Like the SA1100, the EDB7211 has a large gap between physical RAM |
| * banks. In 2.2, the Psion (CL-PS7110) port added custom support for |
| * discontiguous physical memory. In 2.4, we can use the standard |
| * Linux NUMA support. |
| * |
| * This is not necessary for EP7211 implementations with only one used |
| * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM. |
| */ |
| |
| /* |
| * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211 |
| * uses only one of the two banks (bank #1). However, even within |
| * bank #1, memory is discontiguous. |
| * |
| * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between |
| * them, so we use 24 for the node max shift to get 16MB node sizes. |
| */ |
| |
| /* |
| * Because of the wide memory address space between physical RAM banks on the |
| * SA1100, it's much more convenient to use Linux's NUMA support to implement |
| * our memory map representation. Assuming all memory nodes have equal access |
| * characteristics, we then have generic discontiguous memory support. |
| * |
| * Of course, all this isn't mandatory for SA1100 implementations with only |
| * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM. |
| * |
| * The nodes are matched with the physical memory bank addresses which are |
| * incidentally the same as virtual addresses. |
| * |
| * node 0: 0xc0000000 - 0xc7ffffff |
| * node 1: 0xc8000000 - 0xcfffffff |
| * node 2: 0xd0000000 - 0xd7ffffff |
| * node 3: 0xd8000000 - 0xdfffffff |
| */ |
| #define NODE_MEM_SIZE_BITS 24 |
| |
| #endif |
| |
