summaryrefslogtreecommitdiffstats
path: root/arch/sh/boards/se/7751/led.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/boards/se/7751/led.c')
-rw-r--r--arch/sh/boards/se/7751/led.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/sh/boards/se/7751/led.c b/arch/sh/boards/se/7751/led.c
new file mode 100644
index 000000000000..0c788230cf8f
--- /dev/null
+++ b/arch/sh/boards/se/7751/led.c
@@ -0,0 +1,68 @@
+/*
+ * linux/arch/sh/kernel/led_se.c
+ *
+ * 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 Solution Engine specific LED code.
+ */
+
+#include <linux/config.h>
+#include <asm/se7751/se7751.h>
+
+static void mach_led(int position, int value)
+{
+ volatile unsigned short* p = (volatile unsigned short*)PA_LED;
+
+ if (value) {
+ *p |= (1<<8);
+ } else {
+ *p &= ~(1<<8);
+ }
+}
+
+#ifdef CONFIG_HEARTBEAT
+
+#include <linux/sched.h>
+
+/* Cycle the LED's in the clasic Knightrider/Sun pattern */
+void heartbeat_7751se(void)
+{
+ static unsigned int cnt = 0, period = 0;
+ volatile unsigned short* p = (volatile unsigned short*)PA_LED;
+ 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+8);
+
+}
+#endif /* CONFIG_HEARTBEAT */