/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011 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    STM32/mac_lld.h
 * @brief   STM32 low level MAC driver header.
 *
 * @addtogroup MAC
 * @{
 */

#ifndef _MAC_LLD_H_
#define _MAC_LLD_H_

#if HAL_USE_MAC || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @brief   Number of available transmit buffers.
 */
#if !defined(MAC_TRANSMIT_BUFFERS) || defined(__DOXYGEN__)
#define MAC_TRANSMIT_BUFFERS        2
#endif

/**
 * @brief   Number of available receive buffers.
 */
#if !defined(MAC_RECEIVE_BUFFERS) || defined(__DOXYGEN__)
#define MAC_RECEIVE_BUFFERS         2
#endif

/**
 * @brief   Maximum supported frame size.
 */
#if !defined(MAC_BUFFERS_SIZE) || defined(__DOXYGEN__)
#define MAC_BUFFERS_SIZE            1518
#endif

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Type of an STM32 Ethernet receive descriptor.
 */
typedef struct {
  volatile uint32_t     rdes0;
  volatile uint32_t     rdes1;
  volatile uint32_t     rdes2;
  volatile uint32_t     rdes3;
} stm32_eth_rx_descriptor_t;

/**
 * @brief   Type of an STM32 Ethernet transmit descriptor.
 */
typedef struct {
  volatile uint32_t     tdes0;
  volatile uint32_t     tdes1;
  volatile uint32_t     tdes2;
  volatile uint32_t     tdes3;
} stm32_eth_tx_descriptor_t;

/**
 * @brief   Driver configuration structure.
 */
typedef struct {
  /**
   * @brief MAC address.
   */
  uint8_t               *mac_address;
  /* End of the mandatory fields.*/
} MACConfig;

/**
 * @brief   Structure representing a MAC driver.
 */
struct MACDriver {
  /**
   * @brief Driver state.
   */
  macstate_t            state;
  /**
   * @brief Current configuration data.
   */
  const MACConfig       *config;
  /**
   * @brief Transmit semaphore.
   */
  Semaphore             tdsem;
  /**
   * @brief Receive semaphore.
   */
  Semaphore             rdsem;
#if MAC_USE_EVENTS || defined(__DOXYGEN__)
  /**
   * @brief Receive event.
   */
  EventSource           rdevent;
#endif
  /* End of the mandatory fields.*/
};

/**
 * @brief   Structure representing a transmit descriptor.
 */
typedef struct {
  /**
   * @brief Current write offset.
   */
  size_t                offset;
  /**
   * @brief Available space size.
   */
  size_t                size;
  /* End of the mandatory fields.*/
} MACTransmitDescriptor;

/**
 * @brief   Structure representing a receive descriptor.
 */
typedef struct {
  /**
   * @brief Current read offset.
   */
  size_t                offset;
  /**
   * @brief Available data size.
   */
  size_t                size;
  /* End of the mandatory fields.*/
} MACReceiveDescriptor;

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if !defined(__DOXYGEN__)
extern MACDriver ETH1;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void mac_lld_init(void);
  void mac_lld_start(MACDriver *macp);
  void mac_lld_stop(MACDriver *macp);
  msg_t max_lld_get_transmit_descriptor(MACDriver *macp,
                                        MACTransmitDescriptor *tdp);
  size_t mac_lld_write_transmit_descriptor(MACTransmitDescriptor *tdp,
                                           uint8_t *buf,
                                           size_t size);
  void mac_lld_release_transmit_descriptor(MACTransmitDescriptor *tdp);
  msg_t max_lld_get_receive_descriptor(MACDriver *macp,
                                       MACReceiveDescriptor *rdp);
  size_t mac_lld_read_receive_descriptor(MACReceiveDescriptor *rdp,
                                         uint8_t *buf,
                                         size_t size);
  void mac_lld_release_receive_descriptor(MACReceiveDescriptor *rdp);
  bool_t mac_lld_poll_link_status(MACDriver *macp);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_MAC */

#endif /* _MAC_LLD_H_ */

/** @} */