1 files changed, 59 insertions, 0 deletions

diff --git a/arch/sh/boards/overdrive/led.c b/arch/sh/boards/overdrive/led.c
new file mode 100644
index 00000000000..734742e9227
--- /dev/null
+++ b/arch/sh/boards/overdrive/led.c
@@ -0,0 +1,59 @@
+/*
+ * linux/arch/sh/overdrive/led.c
+ *
+ * Copyright (C) 1999 Stuart Menefy <stuart.menefy@st.com>
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ *
+ * This file contains an Overdrive specific LED feature.
+ */
+
+#include <linux/config.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/overdrive/overdrive.h>
+
+static void mach_led(int position, int value)
+{
+        unsigned long flags;
+        unsigned long reg;
+
+        local_irq_save(flags);
+        
+        reg = readl(OVERDRIVE_CTRL);
+        if (value) {
+                reg |= (1<<3);
+        } else {
+                reg &= ~(1<<3);
+        }
+        writel(reg, OVERDRIVE_CTRL);
+
+        local_irq_restore(flags);
+}
+
+#ifdef CONFIG_HEARTBEAT
+
+#include <linux/sched.h>
+
+/* acts like an actual heart beat -- ie thump-thump-pause... */
+void heartbeat_od(void)
+{
+        static unsigned cnt = 0, period = 0, dist = 0;
+
+        if (cnt == 0 || cnt == dist)
+                mach_led( -1, 1);
+        else if (cnt == 7 || cnt == dist+7)
+                mach_led( -1, 0);
+
+        if (++cnt > period) {
+                cnt = 0;
+                /* The hyperbolic function below modifies the heartbeat period
+                 * length in dependency of the current (5min) load. It goes
+                 * through the points f(0)=126, f(1)=86, f(5)=51,
+                 * f(inf)->30. */
+                period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
+                dist = period / 4;
+        }
+}
+#endif /* CONFIG_HEARTBEAT */