linux-kernel - [PATCH 20/56] microblaze

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Date:	Sun,  4 May 2008 13:41:09 +0200
From:	monstr@...nam.cz
To:	linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, linux-arch@...r.kernel.org,
	stephen.neuendorffer@...inx.com, John.Linn@...inx.com,
	john.williams@...alogix.com, matthew@....cx, will.newton@...il.com,
	drepper@...hat.com, microblaze-uclinux@...e.uq.edu.au,
	grant.likely@...retlab.ca, Michal Simek <monstr@...str.eu>
Subject: [PATCH 20/56] microblaze_v2: heartbeat file

From: Michal Simek <monstr@...str.eu>


Signed-off-by: Michal Simek <monstr@...str.eu>
---
 arch/microblaze/kernel/heartbeat.c |   37 ++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)
 create mode 100644 arch/microblaze/kernel/heartbeat.c

diff --git a/arch/microblaze/kernel/heartbeat.c b/arch/microblaze/kernel/heartbeat.c
new file mode 100644
index 0000000..508b463
--- /dev/null
+++ b/arch/microblaze/kernel/heartbeat.c
@@ -0,0 +1,37 @@
+/*
+ * arch/microblaze/kernel/heartbeat.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#include <linux/sched.h>
+#include <asm/page.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+
+void heartbeat(void)
+{
+	static unsigned int cnt, period, dist;
+
+	if (cnt == 0 || cnt == dist)
+		iowrite32(1, CONFIG_HEART_BEAT_ADDRESS);
+	else if (cnt == 7 || cnt == dist + 7)
+		iowrite32(0, CONFIG_HEART_BEAT_ADDRESS);
+
+	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;
+	}
+}
-- 
1.5.4.GIT

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