src/platform/nrfconnect/Reboot.cpp

/*
 *
 *    Copyright (c) 2022 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "Reboot.h"

#include <lib/support/TypeTraits.h>

#include <zephyr/sys/reboot.h>

#ifndef CONFIG_ARCH_POSIX
#include <hal/nrf_power.h>
#endif

namespace chip {
namespace DeviceLayer {

#ifdef CONFIG_ARCH_POSIX

void Reboot(SoftwareRebootReason reason)
{
    sys_reboot(SYS_REBOOT_WARM);
}

SoftwareRebootReason GetSoftwareRebootReason()
{
    return SoftwareRebootReason::kOther;
}

#else

using RetainedReason = decltype(nrf_power_gpregret_get(NRF_POWER));

constexpr RetainedReason EncodeReason(SoftwareRebootReason reason)
{
    // Set MSB to avoid collission with Zephyr's pre-defined reboot reasons.
    constexpr RetainedReason kCustomReasonFlag = 0x80;

    return static_cast<RetainedReason>(reason) | kCustomReasonFlag;
}

void Reboot(SoftwareRebootReason reason)
{
    const RetainedReason retainedReason = EncodeReason(reason);

    // The parameter passed to sys_reboot() is retained in GPREGRET (general-purpose
    // retention register) on nRF52 SOC family, but nRF53 ignores the parameter, so
    // set it manually.

#ifdef CONFIG_SOC_SERIES_NRF53X
    nrf_power_gpregret_set(NRF_POWER, retainedReason);
#endif

    sys_reboot(retainedReason);
}

SoftwareRebootReason GetSoftwareRebootReason()
{
    switch (nrf_power_gpregret_get(NRF_POWER))
    {
    case EncodeReason(SoftwareRebootReason::kSoftwareUpdate):
        nrf_power_gpregret_set(NRF_POWER, 0);
        return SoftwareRebootReason::kSoftwareUpdate;
    default:
        return SoftwareRebootReason::kOther;
    }
}

#endif

} // namespace DeviceLayer
} // namespace chip