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-rw-r--r--arch/sh/boards/bigsur/led.c55
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diff --git a/arch/sh/boards/bigsur/led.c b/arch/sh/boards/bigsur/led.c
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+/*
+ * linux/arch/sh/kernel/led_bigsur.c
+ *
+ * By Dustin McIntire (dustin@sensoria.com) (c)2001
+ * Derived from led_se.c and led.c, which bore the message:
+ * Copyright (C) 2000 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 Big Sur specific LED code.
+ */
+
+#include <linux/config.h>
+#include <asm/io.h>
+#include <asm/bigsur/bigsur.h>
+
+static void mach_led(int position, int value)
+{
+ int word;
+
+ word = bigsur_inl(BIGSUR_CSLR);
+ if (value) {
+ bigsur_outl(word & ~BIGSUR_LED, BIGSUR_CSLR);
+ } else {
+ bigsur_outl(word | BIGSUR_LED, BIGSUR_CSLR);
+ }
+}
+
+#ifdef CONFIG_HEARTBEAT
+
+#include <linux/sched.h>
+
+/* Cycle the LED on/off */
+void heartbeat_bigsur(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 */
+