/*
    ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio

    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.
*/

/**
 * @file    hal_mac_lld.c
 * @brief   PLATFORM MAC subsystem low level driver source.
 *
 * @addtogroup MAC
 * @{
 */

#include <string.h>

#include "hal.h"

#if (HAL_USE_MAC == TRUE) || defined(__DOXYGEN__)

#include "hal_mii.h"

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/**
 * @brief MAC1 driver identifier.
 */
#if (PLATFORM_MAC_USE_MAC1 == TRUE) || defined(__DOXYGEN__)
MACDriver ETHD1;
#endif

/*===========================================================================*/
/* Driver local variables and types.                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   Low level MAC initialization.
 *
 * @notapi
 */
void mac_lld_init(void) {

#if PLATFORM_MAC_USE_MAC1 == TRUE
  /* Driver initialization.*/
  macObjectInit(&MACD1);
#endif
}

/**
 * @brief   Configures and activates the MAC peripheral.
 *
 * @param[in] macp      pointer to the @p MACDriver object
 *
 * @notapi
 */
void mac_lld_start(MACDriver *macp) {

  if (macp->state == MAC_STOP) {
    /* Enables the peripheral.*/
#if PLATFORM_MAC_USE_MAC1 == TRUE
    if (&MACD1 == macp) {

    }
#endif
  }
  /* Configures the peripheral.*/

}

/**
 * @brief   Deactivates the MAC peripheral.
 *
 * @param[in] macp      pointer to the @p MACDriver object
 *
 * @notapi
 */
void mac_lld_stop(MACDriver *macp) {

  if (macp->state != MAC_STOP) {
    /* Resets the peripheral.*/

    /* Disables the peripheral.*/
#if PLATFORM_MAC_USE_MAC1 == TRUE
    if (&MACD1 == macp) {

    }
#endif
  }
}

/**
 * @brief   Returns a transmission descriptor.
 * @details One of the available transmission descriptors is locked and
 *          returned.
 *
 * @param[in] macp      pointer to the @p MACDriver object
 * @param[out] tdp      pointer to a @p MACTransmitDescriptor structure
 * @return              The operation status.
 * @retval MSG_OK       the descriptor has been obtained.
 * @retval MSG_TIMEOUT  descriptor not available.
 *
 * @notapi
 */
msg_t mac_lld_get_transmit_descriptor(MACDriver *macp,
                                      MACTransmitDescriptor *tdp) {

  (void)macp;
  (void)tdp;

  return MSG_OK;
}

/**
 * @brief   Releases a transmit descriptor and starts the transmission of the
 *          enqueued data as a single frame.
 *
 * @param[in] tdp       the pointer to the @p MACTransmitDescriptor structure
 *
 * @notapi
 */
void mac_lld_release_transmit_descriptor(MACTransmitDescriptor *tdp) {

  (void)tdp;

}

/**
 * @brief   Returns a receive descriptor.
 *
 * @param[in] macp      pointer to the @p MACDriver object
 * @param[out] rdp      pointer to a @p MACReceiveDescriptor structure
 * @return              The operation status.
 * @retval MSG_OK       the descriptor has been obtained.
 * @retval MSG_TIMEOUT  descriptor not available.
 *
 * @notapi
 */
msg_t mac_lld_get_receive_descriptor(MACDriver *macp,
                                     MACReceiveDescriptor *rdp) {

  (void)macp;
  (void)rdp;

  return MSG_OK;
}

/**
 * @brief   Releases a receive descriptor.
 * @details The descriptor and its buffer are made available for more incoming
 *          frames.
 *
 * @param[in] rdp       the pointer to the @p MACReceiveDescriptor structure
 *
 * @notapi
 */
void mac_lld_release_receive_descriptor(MACReceiveDescriptor *rdp) {

  (void)rdp;

}

/**
 * @brief   Updates and returns the link status.
 *
 * @param[in] macp      pointer to the @p MACDriver object
 * @return              The link status.
 * @retval true         if the link is active.
 * @retval false        if the link is down.
 *
 * @notapi
 */
bool mac_lld_poll_link_status(MACDriver *macp) {

  (void)macp;

  return false;
}

/**
 * @brief   Writes to a transmit descriptor's stream.
 *
 * @param[in] tdp       pointer to a @p MACTransmitDescriptor structure
 * @param[in] buf       pointer to the buffer containing the data to be
 *                      written
 * @param[in] size      number of bytes to be written
 * @return              The number of bytes written into the descriptor's
 *                      stream, this value can be less than the amount
 *                      specified in the parameter @p size if the maximum
 *                      frame size is reached.
 *
 * @notapi
 */
size_t mac_lld_write_transmit_descriptor(MACTransmitDescriptor *tdp,
                                         uint8_t *buf,
                                         size_t size) {

  (void)tdp;
  (void)buf;

  return size;
}

/**
 * @brief   Reads from a receive descriptor's stream.
 *
 * @param[in] rdp       pointer to a @p MACReceiveDescriptor structure
 * @param[in] buf       pointer to the buffer that will receive the read data
 * @param[in] size      number of bytes to be read
 * @return              The number of bytes read from the descriptor's
 *                      stream, this value can be less than the amount
 *                      specified in the parameter @p size if there are
 *                      no more bytes to read.
 *
 * @notapi
 */
size_t mac_lld_read_receive_descriptor(MACReceiveDescriptor *rdp,
                                       uint8_t *buf,
                                       size_t size) {

  (void)rdp;
  (void)buf;

  return size;
}

#if (MAC_USE_ZERO_COPY == TRUE) || defined(__DOXYGEN__)
/**
 * @brief   Returns a pointer to the next transmit buffer in the descriptor
 *          chain.
 * @note    The API guarantees that enough buffers can be requested to fill
 *          a whole frame.
 *
 * @param[in] tdp       pointer to a @p MACTransmitDescriptor structure
 * @param[in] size      size of the requested buffer. Specify the frame size
 *                      on the first call then scale the value down subtracting
 *                      the amount of data already copied into the previous
 *                      buffers.
 * @param[out] sizep    pointer to variable receiving the buffer size, it is
 *                      zero when the last buffer has already been returned.
 *                      Note that a returned size lower than the amount
 *                      requested means that more buffers must be requested
 *                      in order to fill the frame data entirely.
 * @return              Pointer to the returned buffer.
 * @retval NULL         if the buffer chain has been entirely scanned.
 *
 * @notapi
 */
uint8_t *mac_lld_get_next_transmit_buffer(MACTransmitDescriptor *tdp,
                                          size_t size,
                                          size_t *sizep) {

  (void)tdp;
  (void)size;
  (void)sizep;

  return NULL;
}

/**
 * @brief   Returns a pointer to the next receive buffer in the descriptor
 *          chain.
 * @note    The API guarantees that the descriptor chain contains a whole
 *          frame.
 *
 * @param[in] rdp       pointer to a @p MACReceiveDescriptor structure
 * @param[out] sizep    pointer to variable receiving the buffer size, it is
 *                      zero when the last buffer has already been returned.
 * @return              Pointer to the returned buffer.
 * @retval NULL         if the buffer chain has been entirely scanned.
 *
 * @notapi
 */
const uint8_t *mac_lld_get_next_receive_buffer(MACReceiveDescriptor *rdp,
                                               size_t *sizep) {

  (void)rdp;
  (void)sizep;

  return NULL;
}
#endif /* MAC_USE_ZERO_COPY == TRUE */

#endif /* HAL_USE_MAC == TRUE */

/** @} */
