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

   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 /*
  25  * Physical DRAM offset.
  26  */
  27 #define PHYS_OFFSET     UL(0xc0000000)
  28
  29 #if !defined(CONFIG_ARCH_CDB89712) && !defined (CONFIG_ARCH_AUTCPU12)
  30
  31 #define __virt_to_bus(x)        ((x) - PAGE_OFFSET)
  32 #define __bus_to_virt(x)        ((x) + PAGE_OFFSET)
  33 #define __pfn_to_bus(x)         (__pfn_to_phys(x) - PHYS_OFFSET)
  34 #define __bus_to_pfn(x)         __phys_to_pfn((x) + PHYS_OFFSET)
  35
  36 #endif
  37
  38
  39 /*
  40  * Like the SA1100, the EDB7211 has a large gap between physical RAM
  41  * banks.  In 2.2, the Psion (CL-PS7110) port added custom support for
  42  * discontiguous physical memory.  In 2.4, we can use the standard
  43  * Linux NUMA support.
  44  *
  45  * This is not necessary for EP7211 implementations with only one used
  46  * memory bank.  For those systems, simply undefine CONFIG_DISCONTIGMEM.
  47  */
  48
  49 /*
  50  * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
  51  * uses only one of the two banks (bank #1).  However, even within
  52  * bank #1, memory is discontiguous.
  53  *
  54  * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
  55  * them, so we use 24 for the node max shift to get 16MB node sizes.
  56  */
  57
  58 /*
  59  * Because of the wide memory address space between physical RAM banks on the
  60  * SA1100, it's much more convenient to use Linux's NUMA support to implement
  61  * our memory map representation.  Assuming all memory nodes have equal access
  62  * characteristics, we then have generic discontiguous memory support.
  63  *
  64  * Of course, all this isn't mandatory for SA1100 implementations with only
  65  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
  66  *
  67  * The nodes are matched with the physical memory bank addresses which are
  68  * incidentally the same as virtual addresses.
  69  *
  70  *      node 0:  0xc0000000 - 0xc7ffffff
  71  *      node 1:  0xc8000000 - 0xcfffffff
  72  *      node 2:  0xd0000000 - 0xd7ffffff
  73  *      node 3:  0xd8000000 - 0xdfffffff
  74  */
  75 #define NODE_MEM_SIZE_BITS      24
  76 #define SECTION_SIZE_BITS       24
  77 #define MAX_PHYSMEM_BITS        32
  78
  79 #endif
  80