/* 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 . */ /** * @file STM32/mac_lld.c * @brief STM32 low level MAC driver code. * * @addtogroup MAC * @{ */ #include "ch.h" #include "hal.h" #include "mii.h" #if HAL_USE_MAC || defined(__DOXYGEN__) /*===========================================================================*/ /* Driver local definitions. */ /*===========================================================================*/ #define BUFFER_SLICE ((((MAC_BUFFERS_SIZE - 1) | 3) + 1) / 4) /* MII divider optimal value.*/ #if (STM32_HCLK >= 60000000) #define MACMIIDR_CR ETH_MACMIIAR_CR_Div42 #elif (STM32_HCLK >= 35000000) #define MACMIIDR_CR ETH_MACMIIAR_CR_Div26 #elif (STM32_HCLK >= 20000000) #define MACMIIDR_CR ETH_MACMIIAR_CR_Div16 #else #error "STM32_HCLK below minimum frequency for ETH operations (20MHz)" #endif /* PHY address.*/ #define MACMIIDR_PA (32 << 11) /*===========================================================================*/ /* Driver exported variables. */ /*===========================================================================*/ /** * @brief Ethernet driver 1. */ MACDriver ETH1; /*===========================================================================*/ /* Driver local variables. */ /*===========================================================================*/ static stm32_eth_rx_descriptor_t *rxptr; static stm32_eth_tx_descriptor_t *txptr; static stm32_eth_rx_descriptor_t rd[MAC_RECEIVE_BUFFERS]; static stm32_eth_tx_descriptor_t td[MAC_TRANSMIT_BUFFERS]; static uint32_t rb[MAC_RECEIVE_BUFFERS * BUFFER_SLICE]; static uint32_t tb[MAC_TRANSMIT_BUFFERS * BUFFER_SLICE]; /*===========================================================================*/ /* Driver local functions. */ /*===========================================================================*/ /** * @brief Writes a PHY register. * * @param[in] reg register number * @param[in] value new register value */ static void mii_write_phy(uint16_t reg, uint16_t value) { uint32_t miiar; miiar = ETH->MACMIIAR | ETH_MACMIIAR_MW | ETH_MACMIIAR_MB; miiar = (miiar & ~ETH_MACMIIAR_MR) | (reg << 6); ETH->MACMIIDR = value; ETH->MACMIIAR = miiar; while ((ETH->MACMIIAR & ETH_MACMIIAR_MB) != 0) ; } /** * @brief Reads a PHY register. * * @param[in] reg register number */ static uint16_t mii_read_phy(uint16_t reg) { uint32_t miiar; miiar = ETH->MACMIIAR | ETH_MACMIIAR_MB; miiar = (miiar & ~(ETH_MACMIIAR_MR | ETH_MACMIIAR_MW)) | (reg << 6); ETH->MACMIIAR = miiar; while ((ETH->MACMIIAR & ETH_MACMIIAR_MB) != 0) ; return (uint16_t)ETH->MACMIIDR; } /** * @brief MII/RMII interface initialization. */ static void mii_init(void) { uint32_t i; for (i = 0; i < 31; i++) { ETH->MACMIIDR = (i << 6) | MACMIIDR_CR; if ((mii_read_phy(MII_PHYSID1) == (PHY_ID >> 16)) && (mii_read_phy(MII_PHYSID2) == (PHY_ID & 0xFFF0))) return; } /* Wrong or defective board.*/ chSysHalt(); } /*===========================================================================*/ /* Driver interrupt handlers. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver exported functions. */ /*===========================================================================*/ /** * @brief Low level MAC initialization. * * @notapi */ void mac_lld_init(void) { unsigned i; macObjectInit(Ð1); /* Descriptor tables are initialized in linked mode, note that the first word is not initialized here but in mac_lld_start().*/ for (i = 0; i < MAC_RECEIVE_BUFFERS; i++) { rd[i].rdes1 = RDES1_RCH | MAC_BUFFERS_SIZE; rd[i].rdes2 = (uint32_t)&rb[i * BUFFER_SLICE]; rd[i].rdes3 = (uint32_t)&rb[((i + 1) % MAC_RECEIVE_BUFFERS) * BUFFER_SLICE]; } for (i = 0; i < MAC_TRANSMIT_BUFFERS; i++) { td[i].tdes1 = 0; td[i].tdes2 = (uint32_t)&tb[i * BUFFER_SLICE]; td[i].tdes3 = (uint32_t)&tb[((i + 1) % MAC_TRANSMIT_BUFFERS) * BUFFER_SLICE]; } } /** * @brief Configures and activates the MAC peripheral. * * @param[in] macp pointer to the @p MACDriver object * * @notapi */ void mac_lld_start(MACDriver *macp) { unsigned i; /* Resets the state of all descriptors.*/ for (i = 0; i < MAC_RECEIVE_BUFFERS; i++) rd[i].rdes0 = RDES0_OWN; rxptr = (stm32_eth_rx_descriptor_t *)rd; for (i = 0; i < MAC_TRANSMIT_BUFFERS; i++) td[i].tdes0 = TDES0_TCH; txptr = (stm32_eth_tx_descriptor_t *)td; /* Soft reset of the MAC core and wait until the reset is complete.*/ ETH->DMABMR |= ETH_DMABMR_SR; while (ETH->DMABMR & ETH_DMABMR_SR) ; /* MII initialization.*/ mii_init(); /* Descriptor chains pointers.*/ ETH->DMARDLAR = (uint32_t)rd; ETH->DMATDLAR = (uint32_t)rd; /* Clear DMA status.*/ } /** * @brief Deactivates the MAC peripheral. * * @param[in] macp pointer to the @p MACDriver object * * @notapi */ void mac_lld_stop(MACDriver *macp) { } /** * @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 max_lld_get_transmit_descriptor(MACDriver *macp, MACTransmitDescriptor *tdp) { return RDY_OK; } /** * @brief Writes to a transmit descriptor's stream. * * @param[in] tdp pointer to a @p MACTransmitDescriptor structure * @param[in] buf pointer to the buffer cointaining 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) { return 0; } /** * @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) { } /** * @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 max_lld_get_receive_descriptor(MACDriver *macp, MACReceiveDescriptor *rdp) { return RDY_TIMEOUT; } /** * @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) { return 0; } /** * @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) { } /** * @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) { } #endif /* HAL_USE_MAC */ /** @} */