314 lines
9.3 KiB
C
314 lines
9.3 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file mac_lld.c
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* @brief PLATFORM MAC subsystem low level driver source.
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*
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* @addtogroup MAC
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* @{
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*/
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#include <string.h>
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#include "hal.h"
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#if (HAL_USE_MAC == TRUE) || defined(__DOXYGEN__)
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#include "mii.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief MAC1 driver identifier.
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*/
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#if (PLATFORM_MAC_USE_MAC1 == TRUE) || defined(__DOXYGEN__)
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MACDriver ETHD1;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level MAC initialization.
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*
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* @notapi
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*/
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void mac_lld_init(void) {
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#if PLATFORM_MAC_USE_MAC1 == TRUE
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/* Driver initialization.*/
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macObjectInit(&MACD1);
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#endif
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}
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/**
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* @brief Configures and activates the MAC peripheral.
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*
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* @param[in] macp pointer to the @p MACDriver object
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*
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* @notapi
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*/
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void mac_lld_start(MACDriver *macp) {
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if (macp->state == MAC_STOP) {
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/* Enables the peripheral.*/
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#if PLATFORM_MAC_USE_MAC1 == TRUE
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if (&MACD1 == macp) {
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}
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#endif
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}
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/* Configures the peripheral.*/
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}
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/**
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* @brief Deactivates the MAC peripheral.
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*
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* @param[in] macp pointer to the @p MACDriver object
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*
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* @notapi
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*/
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void mac_lld_stop(MACDriver *macp) {
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if (macp->state != MAC_STOP) {
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/* Resets the peripheral.*/
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/* Disables the peripheral.*/
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#if PLATFORM_MAC_USE_MAC1 == TRUE
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if (&MACD1 == macp) {
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}
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#endif
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}
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}
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/**
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* @brief Returns a transmission descriptor.
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* @details One of the available transmission descriptors is locked and
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* returned.
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*
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* @param[in] macp pointer to the @p MACDriver object
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* @param[out] tdp pointer to a @p MACTransmitDescriptor structure
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* @return The operation status.
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* @retval RDY_OK the descriptor has been obtained.
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* @retval RDY_TIMEOUT descriptor not available.
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*
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* @notapi
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*/
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msg_t mac_lld_get_transmit_descriptor(MACDriver *macp,
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MACTransmitDescriptor *tdp) {
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(void)macp;
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(void)tdp;
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return MSG_OK;
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}
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/**
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* @brief Releases a transmit descriptor and starts the transmission of the
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* enqueued data as a single frame.
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*
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* @param[in] tdp the pointer to the @p MACTransmitDescriptor structure
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*
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* @notapi
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*/
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void mac_lld_release_transmit_descriptor(MACTransmitDescriptor *tdp) {
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(void)tdp;
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}
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/**
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* @brief Returns a receive descriptor.
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*
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* @param[in] macp pointer to the @p MACDriver object
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* @param[out] rdp pointer to a @p MACReceiveDescriptor structure
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* @return The operation status.
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* @retval RDY_OK the descriptor has been obtained.
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* @retval RDY_TIMEOUT descriptor not available.
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*
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* @notapi
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*/
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msg_t mac_lld_get_receive_descriptor(MACDriver *macp,
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MACReceiveDescriptor *rdp) {
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(void)macp;
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(void)rdp;
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return MSG_OK;
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}
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/**
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* @brief Releases a receive descriptor.
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* @details The descriptor and its buffer are made available for more incoming
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* frames.
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*
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* @param[in] rdp the pointer to the @p MACReceiveDescriptor structure
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*
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* @notapi
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*/
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void mac_lld_release_receive_descriptor(MACReceiveDescriptor *rdp) {
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(void)rdp;
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}
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/**
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* @brief Updates and returns the link status.
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*
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* @param[in] macp pointer to the @p MACDriver object
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* @return The link status.
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* @retval true if the link is active.
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* @retval false if the link is down.
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*
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* @notapi
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*/
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bool mac_lld_poll_link_status(MACDriver *macp) {
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(void)macp;
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return false;
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}
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/**
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* @brief Writes to a transmit descriptor's stream.
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*
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* @param[in] tdp pointer to a @p MACTransmitDescriptor structure
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* @param[in] buf pointer to the buffer containing the data to be
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* written
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* @param[in] size number of bytes to be written
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* @return The number of bytes written into the descriptor's
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* stream, this value can be less than the amount
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* specified in the parameter @p size if the maximum
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* frame size is reached.
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*
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* @notapi
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*/
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size_t mac_lld_write_transmit_descriptor(MACTransmitDescriptor *tdp,
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uint8_t *buf,
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size_t size) {
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(void)tdp;
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(void)buf;
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return size;
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}
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/**
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* @brief Reads from a receive descriptor's stream.
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*
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* @param[in] rdp pointer to a @p MACReceiveDescriptor structure
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* @param[in] buf pointer to the buffer that will receive the read data
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* @param[in] size number of bytes to be read
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* @return The number of bytes read from the descriptor's
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* stream, this value can be less than the amount
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* specified in the parameter @p size if there are
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* no more bytes to read.
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*
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* @notapi
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*/
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size_t mac_lld_read_receive_descriptor(MACReceiveDescriptor *rdp,
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uint8_t *buf,
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size_t size) {
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(void)rdp;
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(void)buf;
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return size;
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}
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#if (MAC_USE_ZERO_COPY == TRUE) || defined(__DOXYGEN__)
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/**
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* @brief Returns a pointer to the next transmit buffer in the descriptor
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* chain.
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* @note The API guarantees that enough buffers can be requested to fill
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* a whole frame.
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*
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* @param[in] tdp pointer to a @p MACTransmitDescriptor structure
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* @param[in] size size of the requested buffer. Specify the frame size
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* on the first call then scale the value down subtracting
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* the amount of data already copied into the previous
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* buffers.
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* @param[out] sizep pointer to variable receiving the buffer size, it is
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* zero when the last buffer has already been returned.
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* Note that a returned size lower than the amount
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* requested means that more buffers must be requested
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* in order to fill the frame data entirely.
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* @return Pointer to the returned buffer.
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* @retval NULL if the buffer chain has been entirely scanned.
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*
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* @notapi
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*/
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uint8_t *mac_lld_get_next_transmit_buffer(MACTransmitDescriptor *tdp,
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size_t size,
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size_t *sizep) {
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(void)tdp;
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(void)size;
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(void)sizep;
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return NULL;
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}
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/**
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* @brief Returns a pointer to the next receive buffer in the descriptor
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* chain.
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* @note The API guarantees that the descriptor chain contains a whole
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* frame.
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*
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* @param[in] rdp pointer to a @p MACReceiveDescriptor structure
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* @param[out] sizep pointer to variable receiving the buffer size, it is
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* zero when the last buffer has already been returned.
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* @return Pointer to the returned buffer.
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* @retval NULL if the buffer chain has been entirely scanned.
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*
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* @notapi
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*/
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const uint8_t *mac_lld_get_next_receive_buffer(MACReceiveDescriptor *rdp,
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size_t *sizep) {
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(void)rdp;
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(void)sizep;
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return NULL;
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}
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#endif /* MAC_USE_ZERO_COPY == TRUE */
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#endif /* HAL_USE_MAC == TRUE */
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/** @} */
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