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

   1 /*
   2  *  linux/include/asm-arm/arch-imx/memory.h
   3  *
   4  *  Copyright (C) 1999 ARM Limited
   5  *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #ifndef __ASM_ARCH_MMU_H
  22 #define __ASM_ARCH_MMU_H
  23
  24 #define PHYS_OFFSET     UL(0x08000000)
  25
  26 /*
  27  * Virtual view <-> DMA view memory address translations
  28  * virt_to_bus: Used to translate the virtual address to an
  29  *              address suitable to be passed to set_dma_addr
  30  * bus_to_virt: Used to convert an address for DMA operations
  31  *              to an address that the kernel can use.
  32  */
  33 #define __virt_to_bus(x)        (x - PAGE_OFFSET + PHYS_OFFSET)
  34 #define __bus_to_virt(x)        (x - PHYS_OFFSET + PAGE_OFFSET)
  35
  36 #endif