FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1-RevB_FreedomStudio/freedom-metal/src/drivers/sifive_fe310-g000_hfrosc.c

/* Copyright 2018 SiFive, Inc */
/* SPDX-License-Identifier: Apache-2.0 */

#include <metal/machine/platform.h>

#ifdef METAL_SIFIVE_FE310_G000_HFROSC

#include <metal/drivers/sifive_fe310-g000_hfrosc.h>
#include <metal/machine.h>

#define CONFIG_DIVIDER 0x0000003FUL
#define CONFIG_TRIM    0x001F0000UL
#define CONFIG_ENABLE  0x40000000UL
#define CONFIG_READY   0x80000000UL

long __metal_driver_sifive_fe310_g000_hfrosc_get_rate_hz(const struct metal_clock *clock)
{
    struct metal_clock *ref = __metal_driver_sifive_fe310_g000_hfrosc_ref(clock);
    long config_offset = __metal_driver_sifive_fe310_g000_hfrosc_config_offset(clock);
    struct __metal_driver_sifive_fe310_g000_prci *config_base =
      __metal_driver_sifive_fe310_g000_hfrosc_config_base(clock);
    const struct __metal_driver_vtable_sifive_fe310_g000_prci *vtable =
      __metal_driver_sifive_fe310_g000_prci_vtable();
    long cfg = vtable->get_reg(config_base, config_offset);

    if ((cfg & CONFIG_ENABLE) == 0)
        return -1;
    if ((cfg & CONFIG_READY) == 0)
        return -1;
    return metal_clock_get_rate_hz(ref) / ((cfg & CONFIG_DIVIDER) + 1);
}

long __metal_driver_sifive_fe310_g000_hfrosc_set_rate_hz(struct metal_clock *clock, long rate)
{
    return __metal_driver_sifive_fe310_g000_hfrosc_get_rate_hz(clock);
}

__METAL_DEFINE_VTABLE(__metal_driver_vtable_sifive_fe310_g000_hfrosc) = {
    .clock.get_rate_hz = &__metal_driver_sifive_fe310_g000_hfrosc_get_rate_hz,
    .clock.set_rate_hz = &__metal_driver_sifive_fe310_g000_hfrosc_set_rate_hz,
};
#endif /* METAL_SIFIVE_FE310_G000_HFROSC */

typedef int no_empty_translation_units;