libutils/include/utils/frequency.h

/*
 * Copyright 2017, Data61
 * Commonwealth Scientific and Industrial Research Organisation (CSIRO)
 * ABN 41 687 119 230.
 *
 * This software may be distributed and modified according to the terms of
 * the BSD 2-Clause license. Note that NO WARRANTY is provided.
 * See "LICENSE_BSD2.txt" for details.
 *
 * @TAG(DATA61_BSD)
 */

#pragma once

#include <stdint.h>
#include <utils/time.h>

#define KHZ (1000)
#define MHZ (1000 * KHZ)
#define GHZ (1000 * MHZ)

typedef uint64_t freq_t;

static inline uint64_t freq_cycles_and_hz_to_ns(uint64_t ncycles, freq_t hz)
{
    if (hz % GHZ == 0) {
        return ncycles / (hz / GHZ);
    } else if (hz % MHZ == 0) {
        return ncycles * MS_IN_S / (hz / MHZ);
    } else if (hz % KHZ == 0) {
        return ncycles * US_IN_S / (hz / KHZ);
    }

    return (ncycles * NS_IN_S) / hz;
}

static inline freq_t freq_cycles_and_ns_to_hz(uint64_t ncycles, uint64_t ns)
{
    return (ncycles * NS_IN_S) / ns;
}

static inline uint64_t freq_ns_and_hz_to_cycles(uint64_t ns, freq_t hz)
{
    return (ns * hz) / NS_IN_S;
}