arch/arm/cpu/arm926ejs/spear/reset.c

   1 /*
   2  * (C) Copyright 2009
   3  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <asm/io.h>
  26 #include <asm/arch/hardware.h>
  27 #include <asm/arch/spr_syscntl.h>
  28
  29 void reset_cpu(ulong ignored)
  30 {
  31         struct syscntl_regs *syscntl_regs_p =
  32             (struct syscntl_regs *)CONFIG_SPEAR_SYSCNTLBASE;
  33
  34         printf("System is going to reboot ...\n");
  35
  36         /*
  37          * This 1 second delay will allow the above message
  38          * to be printed before reset
  39          */
  40         udelay((1000 * 1000));
  41
  42         /* Going into slow mode before resetting SOC */
  43         writel(0x02, &syscntl_regs_p->scctrl);
  44
  45         /*
  46          * Writing any value to the system status register will
  47          * reset the SoC
  48          */
  49         writel(0x00, &syscntl_regs_p->scsysstat);
  50
  51         /* system will restart */
  52         while (1)
  53                 ;
  54 }