arch/mips/ite-boards/generic/reset.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      ITE 8172 reset routines.
   5  *
   6  * Copyright 2001 MontaVista Software Inc.
   7  * Author: MontaVista Software, Inc.
   8  *              ppopov@mvista.com or source@mvista.com
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  16  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  17  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  18  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  19  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  21  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  23  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  *  You should have received a copy of the  GNU General Public License along
  27  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  28  *  675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/sched.h>
  32 #include <linux/mm.h>
  33 #include <asm/cacheflush.h>
  34 #include <asm/io.h>
  35 #include <asm/processor.h>
  36 #include <asm/reboot.h>
  37 #include <asm/system.h>
  38
  39 void it8172_restart()
  40 {
  41         set_c0_status(ST0_BEV | ST0_ERL);
  42         change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
  43         flush_cache_all();
  44         write_c0_wired(0);
  45         __asm__ __volatile__("jr\t%0"::"r"(0xbfc00000));
  46 }
  47
  48 void it8172_halt(void)
  49 {
  50         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  51         while (1)
  52                 __asm__(".set\tmips3\n\t"
  53                         "wait\n\t"
  54                         ".set\tmips0");
  55 }
  56
  57 void it8172_power_off(void)
  58 {
  59         it8172_halt();
  60 }