/* Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this
 *      list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/**
 * @file
 *   This file implements requests to the driver triggered by the MAC layer through SWI.
 *
 */

#include "nrf_802154_request.h"

#include <assert.h>
#include <stdbool.h>
#include <stdint.h>

#include "nrf_802154_config.h"
#include "nrf_802154_core.h"
#include "nrf_802154_critical_section.h"
#include "nrf_802154_debug.h"
#include "nrf_802154_utils.h"
#include "nrf_802154_rx_buffer.h"
#include "nrf_802154_swi.h"
#include "hal/nrf_radio.h"

#include <nrf.h>

/** Assert if SWI interrupt is disabled. */
static inline void assert_interrupt_status(void)
{
    assert(nrf_is_nvic_irq_enabled(NRF_802154_SWI_IRQN));
}

#define REQUEST_FUNCTION(func_core, func_swi, ...) \
    bool result = false;                           \
                                                   \
    if (active_vector_priority_is_high())          \
    {                                              \
        result = func_core(__VA_ARGS__);           \
    }                                              \
    else                                           \
    {                                              \
        assert_interrupt_status();                 \
        func_swi(__VA_ARGS__, &result);            \
    }                                              \
                                                   \
    return result;

#define REQUEST_FUNCTION_NO_ARGS(func_core, func_swi) \
    bool result = false;                              \
                                                      \
    if (active_vector_priority_is_high())             \
    {                                                 \
        result = func_core();                         \
    }                                                 \
    else                                              \
    {                                                 \
        assert_interrupt_status();                    \
        func_swi(&result);                            \
    }                                                 \
                                                      \
    return result;

/** Check if active vector priority is high enough to call requests directly.
 *
 *  @retval  true   Active vector priority is greater or equal to SWI priority.
 *  @retval  false  Active vector priority is lower than SWI priority.
 */
static bool active_vector_priority_is_high(void)
{

    return nrf_802154_critical_section_active_vector_priority_get() <= NRF_802154_SWI_PRIORITY;
}

void nrf_802154_request_init(void)
{
    nrf_802154_swi_init();
}

bool nrf_802154_request_sleep(nrf_802154_term_t term_lvl)
{
    REQUEST_FUNCTION(nrf_802154_core_sleep, nrf_802154_swi_sleep, term_lvl)
}

bool nrf_802154_request_receive(nrf_802154_term_t              term_lvl,
                                req_originator_t               req_orig,
                                nrf_802154_notification_func_t notify_function,
                                bool                           notify_abort)
{
    REQUEST_FUNCTION(nrf_802154_core_receive,
                     nrf_802154_swi_receive,
                     term_lvl,
                     req_orig,
                     notify_function,
                     notify_abort)
}

bool nrf_802154_request_transmit(nrf_802154_term_t              term_lvl,
                                 req_originator_t               req_orig,
                                 const uint8_t                * p_data,
                                 bool                           cca,
                                 bool                           immediate,
                                 nrf_802154_notification_func_t notify_function)
{
    REQUEST_FUNCTION(nrf_802154_core_transmit,
                     nrf_802154_swi_transmit,
                     term_lvl,
                     req_orig,
                     p_data,
                     cca,
                     immediate,
                     notify_function)
}

bool nrf_802154_request_energy_detection(nrf_802154_term_t term_lvl,
                                         uint32_t          time_us)
{
    REQUEST_FUNCTION(nrf_802154_core_energy_detection,
                     nrf_802154_swi_energy_detection,
                     term_lvl,
                     time_us)
}

bool nrf_802154_request_cca(nrf_802154_term_t term_lvl)
{
    REQUEST_FUNCTION(nrf_802154_core_cca, nrf_802154_swi_cca, term_lvl)
}

bool nrf_802154_request_continuous_carrier(nrf_802154_term_t term_lvl)
{
    REQUEST_FUNCTION(nrf_802154_core_continuous_carrier, nrf_802154_swi_continuous_carrier,
                     term_lvl)
}

bool nrf_802154_request_buffer_free(uint8_t * p_data)
{
    REQUEST_FUNCTION(nrf_802154_core_notify_buffer_free, nrf_802154_swi_buffer_free, p_data)
}

bool nrf_802154_request_channel_update(void)
{
    REQUEST_FUNCTION_NO_ARGS(nrf_802154_core_channel_update, nrf_802154_swi_channel_update)
}

bool nrf_802154_request_cca_cfg_update(void)
{
    REQUEST_FUNCTION_NO_ARGS(nrf_802154_core_cca_cfg_update, nrf_802154_swi_cca_cfg_update)
}