include/asm-arm/arch-clps711x/memory.h

   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
  23 #include <linux/config.h>
  24
  25 /*
  26  * Physical DRAM offset.
  27  */
  28 #define PHYS_OFFSET     UL(0xc0000000)
  29
  30 /*
  31  * Virtual view <-> DMA view memory address translations
  32  * virt_to_bus: Used to translate the virtual address to an
  33  *              address suitable to be passed to set_dma_addr
  34  * bus_to_virt: Used to convert an address for DMA operations
  35  *              to an address that the kernel can use.
  36  */
  37
  38 #if defined(CONFIG_ARCH_CDB89712)
  39
  40 #define __virt_to_bus(x)        (x)
  41 #define __bus_to_virt(x)        (x)
  42
  43 #elif defined (CONFIG_ARCH_AUTCPU12)
  44
  45 #define __virt_to_bus(x)        (x)
  46 #define __bus_to_virt(x)        (x)
  47
  48 #else
  49
  50 #define __virt_to_bus(x)        ((x) - PAGE_OFFSET)
  51 #define __bus_to_virt(x)        ((x) + PAGE_OFFSET)
  52
  53 #endif
  54
  55
  56 /*
  57  * Like the SA1100, the EDB7211 has a large gap between physical RAM
  58  * banks.  In 2.2, the Psion (CL-PS7110) port added custom support for
  59  * discontiguous physical memory.  In 2.4, we can use the standard
  60  * Linux NUMA support.
  61  *
  62  * This is not necessary for EP7211 implementations with only one used
  63  * memory bank.  For those systems, simply undefine CONFIG_DISCONTIGMEM.
  64  */
  65
  66 #ifdef CONFIG_DISCONTIGMEM
  67 /*
  68  * Because of the wide memory address space between physical RAM banks on the
  69  * SA1100, it's much more convenient to use Linux's NUMA support to implement
  70  * our memory map representation.  Assuming all memory nodes have equal access
  71  * characteristics, we then have generic discontiguous memory support.
  72  *
  73  * Of course, all this isn't mandatory for SA1100 implementations with only
  74  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
  75  *
  76  * The nodes are matched with the physical memory bank addresses which are
  77  * incidentally the same as virtual addresses.
  78  *
  79  *      node 0:  0xc0000000 - 0xc7ffffff
  80  *      node 1:  0xc8000000 - 0xcfffffff
  81  *      node 2:  0xd0000000 - 0xd7ffffff
  82  *      node 3:  0xd8000000 - 0xdfffffff
  83  */
  84
  85 /*
  86  * Given a kernel address, find the home node of the underlying memory.
  87  */
  88 #define KVADDR_TO_NID(addr) \
  89                 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
  90
  91 /*
  92  * Given a page frame number, convert it to a node id.
  93  */
  94 #define PFN_TO_NID(pfn) \
  95         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
  96
  97 /*
  98  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  99  * and returns the mem_map of that node.
 100  */
 101 #define ADDR_TO_MAPBASE(kaddr) \
 102                         NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
 103
 104 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
 105
 106 /*
 107  * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory
 108  * and returns the index corresponding to the appropriate page in the
 109  * node's mem_map.
 110  */
 111 #define LOCAL_MAP_NR(addr) \
 112         (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
 113
 114 /*
 115  * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
 116  * uses only one of the two banks (bank #1).  However, even within
 117  * bank #1, memory is discontiguous.
 118  *
 119  * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
 120  * them, so we use 24 for the node max shift to get 16MB node sizes.
 121  */
 122 #define NODE_MAX_MEM_SHIFT      24
 123 #define NODE_MAX_MEM_SIZE       (1<<NODE_MAX_MEM_SHIFT)
 124
 125 #endif /* CONFIG_DISCONTIGMEM */
 126
 127 #endif
 128