sh: First support code of SuperH.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 50 insertions, 0 deletions

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 <common.h>
+#include <asm/processor.h>
+
+#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);
+}
+
+