cpu/sh4/watchdog.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License as
   4  * published by the Free Software Foundation; either version 2 of
   5  * the License, or (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  15  * MA 02111-1307 USA
  16  */
  17
  18 #include <common.h>
  19 #include <asm/processor.h>
  20
  21 #define WDT_BASE        WTCNT
  22
  23 static unsigned char cnt_read (void){
  24         return *((volatile unsigned char *)(WDT_BASE + 0x00));
  25 }
  26
  27 static unsigned char csr_read (void){
  28         return *((volatile unsigned char *)(WDT_BASE + 0x04));
  29 }
  30
  31 static void cnt_write (unsigned char value){
  32         while (csr_read() & (1 << 5)) {
  33                 /* delay */
  34         }
  35         *((volatile unsigned short *)(WDT_BASE + 0x00))
  36                 = ((unsigned short) value) | 0x5A00;
  37 }
  38
  39 static void csr_write (unsigned char value){
  40         *((volatile unsigned short *)(WDT_BASE + 0x04))
  41                 = ((unsigned short) value) | 0xA500;
  42 }
  43
  44
  45 int watchdog_init (void){ return 0; }
  46
  47 void reset_cpu (unsigned long ignored)
  48 {
  49         while(1);
  50 }