/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    templates/mac_lld.c
 * @brief   MAC Driver subsystem low level driver source template.
 *
 * @addtogroup MAC
 * @{
 */

#include <string.h>

#include "ch.h"
#include "hal.h"
#include "mii.h"

#if HAL_USE_MAC || defined(__DOXYGEN__)

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

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

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

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

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

/**
 * @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
    if (&MACD1 == macp) {

    }
#endif /* PLATFORM_MAC_USE_MAC1 */
  }
  /* 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_ACTIVE) {
    /* Resets the peripheral.*/

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

    }
#endif /* PLATFORM_MAC_USE_MAC1 */
  }
}

/**
 * @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 RDY_OK       the descriptor has been obtained.
 * @retval RDY_TIMEOUT  descriptor not available.
 *
 * @notapi
 */
msg_t mac_lld_get_transmit_descriptor(MACDriver *macp,
                                      MACTransmitDescriptor *tdp) {

  (void)macp;
  (void)tdp;

  return RDY_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 RDY_OK       the descriptor has been obtained.
 * @retval RDY_TIMEOUT  descriptor not available.
 *
 * @notapi
 */
msg_t mac_lld_get_receive_descriptor(MACDriver *macp,
                                     MACReceiveDescriptor *rdp) {

  (void)macp;
  (void)rdp;

  return RDY_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_t 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 || 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 */

#endif /* HAL_USE_MAC */

/** @} */