release/src-rt-6.x/linux/linux-2.6/include/asm-arm/arch-ixp23xx/memory.h

   1 /*
   2  * include/asm-arm/arch-ixp23xx/memory.h
   3  *
   4  * Copyright (c) 2003-2004 Intel Corp.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #ifndef __ASM_ARCH_MEMORY_H
  13 #define __ASM_ARCH_MEMORY_H
  14
  15 #include <asm/hardware.h>
  16
  17 /*
  18  * Physical DRAM offset.
  19  */
  20 #define PHYS_OFFSET             (0x00000000)
  21
  22
  23 /*
  24  * Virtual view <-> DMA view memory address translations
  25  * virt_to_bus: Used to translate the virtual address to an
  26  *              address suitable to be passed to set_dma_addr
  27  * bus_to_virt: Used to convert an address for DMA operations
  28  *              to an address that the kernel can use.
  29  */
  30 #ifndef __ASSEMBLY__
  31 #include <asm/mach-types.h>
  32
  33 #define __virt_to_bus(v)                                                \
  34         ({ unsigned int ret;                                            \
  35         ret = ((__virt_to_phys(v) - 0x00000000) +                       \
  36          (*((volatile int *)IXP23XX_PCI_SDRAM_BAR) & 0xfffffff0));      \
  37         ret; })
  38
  39 #define __bus_to_virt(b)                                                \
  40         ({ unsigned int data;                                           \
  41         data = *((volatile int *)IXP23XX_PCI_SDRAM_BAR);                \
  42          __phys_to_virt((((b - (data & 0xfffffff0)) + 0x00000000))); })
  43
  44 #define arch_is_coherent()      1
  45
  46 #endif
  47
  48
  49 #endif