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 PLAT_PHYS_OFFSET                UL(0x70000000)
  28 #else
  29 #define PLAT_PHYS_OFFSET                UL(0x00000000)
  30 #endif
  31
  32 #ifdef CONFIG_ZONE_DMA
  33 #define ARM_DMA_ZONE_SIZE       SZ_256M
  34 #endif
  35
  36 #ifdef CONFIG_SPARSEMEM
  37
  38 /*
  39  * Sparsemem definitions for RealView PBX.
  40  *
  41  * The RealView PBX board has another block of 512MB of RAM at 0x20000000,
  42  * however only the block at 0x70000000 (or the 256MB mirror at 0x00000000)
  43  * may be used for DMA.
  44  *
  45  * The macros below define a section size of 256MB and a non-linear virtual to
  46  * physical mapping:
  47  *
  48  * 256MB @ 0x00000000 -> PAGE_OFFSET
  49  * 512MB @ 0x20000000 -> PAGE_OFFSET + 0x10000000
  50  * 256MB @ 0x80000000 -> PAGE_OFFSET + 0x30000000
  51  */
  52 #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
  53 #error "SPARSEMEM not available with REALVIEW_HIGH_PHYS_OFFSET"
  54 #endif
  55
  56 #define MAX_PHYSMEM_BITS        32
  57 #define SECTION_SIZE_BITS       28
  58
  59 /* bank page offsets */
  60 #define PAGE_OFFSET1    (PAGE_OFFSET + 0x10000000)
  61 #define PAGE_OFFSET2    (PAGE_OFFSET + 0x30000000)
  62
  63 #define __phys_to_virt(phys)                                            \
  64         ((phys) >= 0x80000000 ? (phys) - 0x80000000 + PAGE_OFFSET2 :    \
  65          (phys) >= 0x20000000 ? (phys) - 0x20000000 + PAGE_OFFSET1 :    \
  66          (phys) + PAGE_OFFSET)
  67
  68 #define __virt_to_phys(virt)                                            \
  69          ((virt) >= PAGE_OFFSET2 ? (virt) - PAGE_OFFSET2 + 0x80000000 : \
  70           (virt) >= PAGE_OFFSET1 ? (virt) - PAGE_OFFSET1 + 0x20000000 : \
  71           (virt) - PAGE_OFFSET)
  72
  73 #endif  /* CONFIG_SPARSEMEM */
  74
  75 #endif