release/src-rt-6.x.4708/linux/linux-2.6.36/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)
  33 extern 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