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Diffstat (limited to 'kernel/arch/metag/include/asm/clock.h')
-rw-r--r-- | kernel/arch/metag/include/asm/clock.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/arch/metag/include/asm/clock.h b/kernel/arch/metag/include/asm/clock.h new file mode 100644 index 000000000..ded4ab2e1 --- /dev/null +++ b/kernel/arch/metag/include/asm/clock.h @@ -0,0 +1,59 @@ +/* + * 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. + * If a "core" clock is provided by the device tree, it + * will override this function. + */ +struct meta_clock_desc { + unsigned long (*get_core_freq)(void); +}; + +extern struct meta_clock_desc _meta_clock; + +/* + * Perform platform clock initialisation, reading clocks from device tree etc. + * Only accessible during boot. + */ +void init_metag_clocks(void); + +/* + * 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_ */ |