1 files changed, 49 insertions, 0 deletions
diff --git a/arch/sh/boards/sh03/led.c b/arch/sh/boards/sh03/led.c
new file mode 100644
index 000000000000..c851b0bec80f
--- /dev/null
+++ b/arch/sh/boards/sh03/led.c
@@ -0,0 +1,49 @@
+/*
+ * linux/arch/sh/boards/sh03/led.c
+ *
+ * Copyright (C) 2004  Saito.K Interface Corporation.
+ *
+ * This file contains Interface CTP/PCI-SH03 specific LED code.
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+
+/* Cycle the LED's in the clasic Knightrider/Sun pattern */
+void heartbeat_sh03(void)
+{
+	static unsigned int cnt = 0, period = 0;
+	volatile unsigned char* p = (volatile unsigned char*)0xa0800000;
+	static unsigned bit = 0, up = 1;
+
+	cnt += 1;
+	if (cnt < period) {
+		return;
+	}
+
+	cnt = 0;
+
+	/* Go through the points (roughly!):
+	 * f(0)=10, f(1)=16, f(2)=20, f(5)=35,f(inf)->110
+	 */
+	period = 110 - ( (300<<FSHIFT)/
+			 ((avenrun[0]/5) + (3<<FSHIFT)) );
+
+	if (up) {
+		if (bit == 7) {
+			bit--;
+			up=0;
+		} else {
+			bit ++;
+		}
+	} else {
+		if (bit == 0) {
+			bit++;
+			up=1;
+		} else {
+			bit--;
+		}
+	}
+	*p = 1<<bit;
+
+}