LXR uboot/arch/arm/cpu/arm920t/cpu.c

   1/*
   2 * (C) Copyright 2002
   3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4 * Marius Groeger <mgroeger@sysgo.de>
   5 *
   6 * (C) Copyright 2002
   7 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
   8 *
   9 * See file CREDITS for list of people who contributed to this
  10 * project.
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation; either version 2 of
  15 * the License, or (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25 * MA 02111-1307 USA
  26 */
  27
  28/*
  29 * CPU specific code
  30 */
  31
  32#include <common.h>
  33#include <command.h>
  34#include <asm/system.h>
  35
  36static void cache_flush(void);
  37
  38int cleanup_before_linux (void)
  39{
  40        /*
  41         * this function is called just before we call linux
  42         * it prepares the processor for linux
  43         *
  44         * we turn off caches etc ...
  45         */
  46
  47        disable_interrupts ();
  48
  49        /* turn off I/D-cache */
  50        icache_disable();
  51        dcache_disable();
  52        /* flush I/D-cache */
  53        cache_flush();
  54
  55        return 0;
  56}
  57
  58/* flush I/D-cache */
  59static void cache_flush (void)
  60{
  61        unsigned long i = 0;
  62
  63        asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
  64}
  65