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-rw-r--r--arch/metag/include/asm/clock.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/metag/include/asm/clock.h b/arch/metag/include/asm/clock.h
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+++ b/arch/metag/include/asm/clock.h
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+/*
+ * arch/metag/include/asm/clock.h
+ *
+ * Copyright (C) 2012 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _METAG_CLOCK_H_
+#define _METAG_CLOCK_H_
+
+#include <asm/mach/arch.h>
+
+/**
+ * struct meta_clock_desc - Meta Core clock callbacks.
+ * @get_core_freq: Get the frequency of the Meta core. If this is NULL, the
+ * core frequency will be determined like this:
+ * Meta 1: based on loops_per_jiffy.
+ * Meta 2: (EXPAND_TIMER_DIV + 1) MHz.
+ */
+struct meta_clock_desc {
+ unsigned long (*get_core_freq)(void);
+};
+
+extern struct meta_clock_desc _meta_clock;
+
+/*
+ * Set up the default clock, ensuring all callbacks are valid - only accessible
+ * during boot.
+ */
+void setup_meta_clocks(struct meta_clock_desc *desc);
+
+/**
+ * get_coreclock() - Get the frequency of the Meta core clock.
+ *
+ * Returns: The Meta core clock frequency in Hz.
+ */
+static inline unsigned long get_coreclock(void)
+{
+ /*
+ * Use the current clock callback. If set correctly this will provide
+ * the most accurate frequency as it can be calculated directly from the
+ * PLL configuration. otherwise a default callback will have been set
+ * instead.
+ */
+ return _meta_clock.get_core_freq();
+}
+
+#endif /* _METAG_CLOCK_H_ */