261 lines
8.2 KiB
C
261 lines
8.2 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file STM32/mac_lld.c
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* @brief STM32 low level MAC driver code.
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*
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* @addtogroup MAC
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#include "mii.h"
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#
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#if HAL_USE_MAC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#define BUFFER_SLICE ((((MAC_BUFFERS_SIZE - 1) | 3) + 1) / 4)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief Ethernet driver 1.
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*/
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MACDriver ETH1;
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static stm32_eth_rx_descriptor_t *rxptr;
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static stm32_eth_tx_descriptor_t *txptr;
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static stm32_eth_rx_descriptor_t rd[MAC_RECEIVE_BUFFERS];
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static stm32_eth_tx_descriptor_t td[MAC_TRANSMIT_BUFFERS];
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static uint32_t rb[MAC_RECEIVE_BUFFERS * BUFFER_SLICE];
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static uint32_t tb[MAC_TRANSMIT_BUFFERS * BUFFER_SLICE];
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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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unsigned i;
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macObjectInit(Ð1);
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/* Descriptor tables are initialized in linked mode, note that the first
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word is not initialized here but in mac_lld_start().*/
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for (i = 0; i < MAC_RECEIVE_BUFFERS; i++) {
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rd[i].rdes1 = RDES1_RCH | MAC_BUFFERS_SIZE;
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rd[i].rdes2 = (uint32_t)&rb[i * BUFFER_SLICE];
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rd[i].rdes3 = (uint32_t)&rb[((i + 1) % MAC_RECEIVE_BUFFERS) *
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BUFFER_SLICE];
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}
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for (i = 0; i < MAC_TRANSMIT_BUFFERS; i++) {
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td[i].tdes1 = 0;
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td[i].tdes2 = (uint32_t)&tb[i * BUFFER_SLICE];
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td[i].tdes3 = (uint32_t)&tb[((i + 1) % MAC_TRANSMIT_BUFFERS) *
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BUFFER_SLICE];
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}
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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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unsigned i;
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/* Resets the state of all descriptors.*/
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for (i = 0; i < MAC_RECEIVE_BUFFERS; i++)
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rd[i].rdes0 = RDES0_OWN;
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rxptr = (stm32_eth_rx_descriptor_t *)rd;
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for (i = 0; i < MAC_TRANSMIT_BUFFERS; i++)
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td[i].tdes0 = TDES0_TCH;
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txptr = (stm32_eth_tx_descriptor_t *)td;
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/* Soft reset of the MAC core and wait until the reset is complete.*/
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ETH->DMABMR |= ETH_DMABMR_SR;
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while (ETH->DMABMR & ETH_DMABMR_SR)
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;
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/* Descriptor chains pointers.*/
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ETH->DMARDLAR = (uint32_t)rd;
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ETH->DMATDLAR = (uint32_t)rd;
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/* Clear DMA status.*/
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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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}
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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 max_lld_get_transmit_descriptor(MACDriver *macp,
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MACTransmitDescriptor *tdp) {
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return RDY_OK;
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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 cointaining 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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return 0;
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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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}
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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 max_lld_get_receive_descriptor(MACDriver *macp,
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MACReceiveDescriptor *rdp) {
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return RDY_TIMEOUT;
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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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return 0;
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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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}
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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_t mac_lld_poll_link_status(MACDriver *macp) {
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}
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#endif /* HAL_USE_MAC */
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/** @} */
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