Implement cpu frequency scaling for Arndale

* Implements platform driver for Arndale providing Regulator for CPU clock
* Implements a cpu frequency scaling test using the affinity test
* Fixes #770

os/include/platform/arndale/regulator/consts.h

@@ -0,0 +1,68 @@
+/*
+ * \brief  Regulator definitions for Arndale
+ * \author Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
+ * \date   2013-06-13
+ */
+
+/*
+ * Copyright (C) 2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__PLATFORM__ARNDALE__REGULATOR__CONSTS_H_
+#define _INCLUDE__PLATFORM__ARNDALE__REGULATOR__CONSTS_H_
+
+#include <util/string.h>
+
+namespace Regulator {
+
+	enum Regulator_id {
+		CLK_CPU,
+		MAX,
+		INVALID
+	};
+
+	struct Regulator_name {
+		Regulator_id id;
+		const char * name;
+	};
+
+	Regulator_name names[] = {
+		{ CLK_CPU, "clock-cpu" },
+	};
+
+	Regulator_id regulator_id_by_name(const char * name)
+	{
+		for (unsigned i = 0; i < MAX; i++)
+			if (Genode::strcmp(names[i].name, name) == 0)
+				return names[i].id;
+		return INVALID;
+	}
+
+	const char * regulator_name_by_id(Regulator_id id)   {
+		return (id < MAX) ? names[id].name : 0; }
+
+
+	/***************************************
+	 ** Device specific level definitions **
+	 ***************************************/
+
+	enum Cpu_clock_freq {
+		CPU_FREQ_200,
+		CPU_FREQ_400,
+		CPU_FREQ_600,
+		CPU_FREQ_800,
+		CPU_FREQ_1000,
+		CPU_FREQ_1200,
+		CPU_FREQ_1400,
+		CPU_FREQ_1600,
+		CPU_FREQ_1700, /* warning: 1700 not recommended by the reference manual
+		              we just insert this for performance measurement against
+		              Linux, which uses this overclocking */
+		CPU_FREQ_MAX
+	};
+}
+
+#endif /* _INCLUDE__PLATFORM__ARNDALE__REGULATOR__CONSTS_H_ */