Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/asm-arm/arch-clps711x/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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | /* |
| 25 | * Physical DRAM offset. |
| 26 | */ |
Nicolas Pitre | f09b997 | 2005-10-29 21:44:55 +0100 | [diff] [blame] | 27 | #define PHYS_OFFSET UL(0xc0000000) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | /* |
| 30 | * Virtual view <-> DMA view memory address translations |
| 31 | * virt_to_bus: Used to translate the virtual address to an |
| 32 | * address suitable to be passed to set_dma_addr |
| 33 | * bus_to_virt: Used to convert an address for DMA operations |
| 34 | * to an address that the kernel can use. |
| 35 | */ |
| 36 | |
| 37 | #if defined(CONFIG_ARCH_CDB89712) |
| 38 | |
| 39 | #define __virt_to_bus(x) (x) |
| 40 | #define __bus_to_virt(x) (x) |
| 41 | |
| 42 | #elif defined (CONFIG_ARCH_AUTCPU12) |
| 43 | |
| 44 | #define __virt_to_bus(x) (x) |
| 45 | #define __bus_to_virt(x) (x) |
| 46 | |
| 47 | #else |
| 48 | |
| 49 | #define __virt_to_bus(x) ((x) - PAGE_OFFSET) |
| 50 | #define __bus_to_virt(x) ((x) + PAGE_OFFSET) |
| 51 | |
| 52 | #endif |
| 53 | |
| 54 | |
| 55 | /* |
| 56 | * Like the SA1100, the EDB7211 has a large gap between physical RAM |
| 57 | * banks. In 2.2, the Psion (CL-PS7110) port added custom support for |
| 58 | * discontiguous physical memory. In 2.4, we can use the standard |
| 59 | * Linux NUMA support. |
| 60 | * |
| 61 | * This is not necessary for EP7211 implementations with only one used |
| 62 | * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM. |
| 63 | */ |
| 64 | |
| 65 | #ifdef CONFIG_DISCONTIGMEM |
| 66 | /* |
| 67 | * Because of the wide memory address space between physical RAM banks on the |
| 68 | * SA1100, it's much more convenient to use Linux's NUMA support to implement |
| 69 | * our memory map representation. Assuming all memory nodes have equal access |
| 70 | * characteristics, we then have generic discontiguous memory support. |
| 71 | * |
| 72 | * Of course, all this isn't mandatory for SA1100 implementations with only |
| 73 | * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM. |
| 74 | * |
| 75 | * The nodes are matched with the physical memory bank addresses which are |
| 76 | * incidentally the same as virtual addresses. |
| 77 | * |
| 78 | * node 0: 0xc0000000 - 0xc7ffffff |
| 79 | * node 1: 0xc8000000 - 0xcfffffff |
| 80 | * node 2: 0xd0000000 - 0xd7ffffff |
| 81 | * node 3: 0xd8000000 - 0xdfffffff |
| 82 | */ |
| 83 | |
| 84 | /* |
| 85 | * Given a kernel address, find the home node of the underlying memory. |
| 86 | */ |
| 87 | #define KVADDR_TO_NID(addr) \ |
| 88 | (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT) |
| 89 | |
| 90 | /* |
| 91 | * Given a page frame number, convert it to a node id. |
| 92 | */ |
| 93 | #define PFN_TO_NID(pfn) \ |
| 94 | (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT)) |
| 95 | |
| 96 | /* |
| 97 | * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory |
| 98 | * and returns the mem_map of that node. |
| 99 | */ |
| 100 | #define ADDR_TO_MAPBASE(kaddr) \ |
| 101 | NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr))) |
| 102 | |
| 103 | #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) |
| 104 | |
| 105 | /* |
| 106 | * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory |
| 107 | * and returns the index corresponding to the appropriate page in the |
| 108 | * node's mem_map. |
| 109 | */ |
| 110 | #define LOCAL_MAP_NR(addr) \ |
| 111 | (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT) |
| 112 | |
| 113 | /* |
| 114 | * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211 |
| 115 | * uses only one of the two banks (bank #1). However, even within |
| 116 | * bank #1, memory is discontiguous. |
| 117 | * |
| 118 | * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between |
| 119 | * them, so we use 24 for the node max shift to get 16MB node sizes. |
| 120 | */ |
| 121 | #define NODE_MAX_MEM_SHIFT 24 |
| 122 | #define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT) |
| 123 | |
| 124 | #endif /* CONFIG_DISCONTIGMEM */ |
| 125 | |
| 126 | #endif |
| 127 | |