sh: Add support watchdog for SH4A core

Add support watchdog for SH4A core (SH7763, SH7780 and SH7785).
And fix some compile warning.

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

1 files changed, 37 insertions, 16 deletions

diff --git a/cpu/sh4/watchdog.c b/cpu/sh4/watchdog.c
index 346e217..f692429 100644
--- a/cpu/sh4/watchdog.c
+++ b/cpu/sh4/watchdog.c
@@ -17,34 +17,55 @@
 
 #include <common.h>
 #include <asm/processor.h>
+#include <asm/io.h>
 
 #define WDT_BASE	WTCNT
 
-static unsigned char cnt_read (void){
-	return *((volatile unsigned char *)(WDT_BASE + 0x00));
+#define WDT_WD		(1 << 6)
+#define WDT_RST_P	(0)
+#define WDT_RST_M	(1 << 5)
+#define WDT_ENABLE	(1 << 7)
+
+#if defined(CONFIG_WATCHDOG)
+static unsigned char csr_read(void)
+{
+	return inb(WDT_BASE + 0x04);
 }
 
-static unsigned char csr_read (void){
-	return *((volatile unsigned char *)(WDT_BASE + 0x04));
+static void cnt_write(unsigned char value)
+{
+	outl((unsigned short)value | 0x5A00, WDT_BASE + 0x00);
 }
 
-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)
+{
+	outl((unsigned short)value | 0xA500, WDT_BASE + 0x04);
 }
 
-static void csr_write (unsigned char value){
-	*((volatile unsigned short *)(WDT_BASE + 0x04))
-		= ((unsigned short) value) | 0xA500;
+void watchdog_reset(void)
+{
+	outl(0x55000000, WDT_BASE + 0x08);
 }
 
+int watchdog_init(void)
+{
+	/* Set overflow time*/
+	cnt_write(0);
+	/* Power on reset */
+	csr_write(WDT_WD|WDT_RST_P|WDT_ENABLE);
+
+	return 0;
+}
 
-int watchdog_init (void){ return 0; }
+int watchdog_disable(void)
+{
+	csr_write(csr_read() & ~WDT_ENABLE);
+	return 0;
+}
+#endif
 
-void reset_cpu (unsigned long ignored)
+void reset_cpu(unsigned long ignored)
 {
-	while(1);
+	while (1)
+		;
 }