LXR linux/arch/arm/mach-realview/include/mach/memory.h

   1/*
   2 *  arch/arm/mach-realview/include/mach/memory.h
   3 *
   4 *  Copyright (C) 2003 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#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
  27#define PHYS_OFFSET             UL(0x70000000)
  28#else
  29#define PHYS_OFFSET             UL(0x00000000)
  30#endif
  31
  32#if !defined(__ASSEMBLY__) && defined(CONFIG_ZONE_DMA)
  33extern void realview_adjust_zones(unsigned long *size, unsigned long *hole);
  34#define arch_adjust_zones(size, hole) \
  35        realview_adjust_zones(size, hole)
  36
  37#define ISA_DMA_THRESHOLD       (PHYS_OFFSET + SZ_256M - 1)
  38#define MAX_DMA_ADDRESS         (PAGE_OFFSET + SZ_256M)
  39#endif
  40
  41#ifdef CONFIG_SPARSEMEM
  42
  43/*
  44 * Sparsemem definitions for RealView PBX.
  45 *
  46 * The RealView PBX board has another block of 512MB of RAM at 0x20000000,
  47 * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000)
  48 * may be used for DMA.
  49 *
  50 * The macros below define a section size of 256MB and a non-linear virtual to
  51 * physical mapping:
  52 *
  53 * 256MB @ 0x00000000 -> PAGE_OFFSET
  54 * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000
  55 * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000
  56 */
  57#ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
  58#error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET"
  59#endif
  60
  61#define MAX_PHYSMEM_BITS        32
  62#define SECTION_SIZE_BITS       28
  63
  64/* bank page offsets */
  65#define PAGE_OFFSET1    (PAGE_OFFSET + 0x10000000)
  66#define PAGE_OFFSET2    (PAGE_OFFSET + 0x30000000)
  67
  68#define __phys_to_virt(phys)                                            \
  69        ((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 :    \
  70         (phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 :    \
  71         (phys) + PAGE_OFFSET)
  72
  73#define __virt_to_phys(virt)                                            \
  74         ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \
  75          (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \
  76          (virt) - PAGE_OFFSET)
  77
  78#endif  /* CONFIG_SPARSEMEM */
  79
  80#endif
  81