From 0b135cfc2e524dc249b75057b55dd4cc09842e27 Mon Sep 17 00:00:00 2001 From: Nobuhiro Iwamatsu Date: Sun, 13 May 2007 20:58:00 +0900 Subject: sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu --- cpu/sh4/watchdog.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 cpu/sh4/watchdog.c (limited to 'cpu/sh4/watchdog.c') diff --git a/cpu/sh4/watchdog.c b/cpu/sh4/watchdog.c new file mode 100644 index 0000000..e2bc820 --- /dev/null +++ b/cpu/sh4/watchdog.c @@ -0,0 +1,50 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include + +#define WDT_BASE WTCNT + +static unsigned char cnt_read (void){ + return *((volatile unsigned char *)(WDT_BASE + 0x00)); +} + +static unsigned char csr_read (void){ + return *((volatile unsigned char *)(WDT_BASE + 0x04)); +} + +static void cnt_write (unsigned char value){ + while (csr_read() & (1 << 5)) { + /* delay */ + } + *((volatile unsigned short *)(WDT_BASE + 0x00)) = ((unsigned short) value) | 0x5A00; +} + +static void csr_write (unsigned char value){ + *((volatile unsigned short *)(WDT_BASE + 0x04)) = ((unsigned short) value) | 0xA500; +} + + +int watchdog_init (void){ return 0; } + +void reset_cpu (unsigned long ignored) +{ + while(1); +} + + -- cgit v1.1