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ChibiOS/os/hal/platforms/STM32/mac_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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.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
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief Ethernet driver 1.
*/
MACDriver ETHD1;
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
static uint32_t phyaddr;
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(uint32_t reg, uint32_t value) {
ETH->MACMIIDR = value;
ETH->MACMIIAR = phyaddr | (reg << 6) | MACMIIDR_CR |
ETH_MACMIIAR_MW | ETH_MACMIIAR_MB;
while ((ETH->MACMIIAR & ETH_MACMIIAR_MB) != 0)
;
}
/**
* @brief Reads a PHY register.
*
* @param[in] reg register number
*/
static uint32_t mii_read_phy(uint32_t reg) {
ETH->MACMIIAR = phyaddr | (reg << 6) | MACMIIDR_CR |
ETH_MACMIIAR_MB;
while ((ETH->MACMIIAR & ETH_MACMIIAR_MB) != 0)
;
return ETH->MACMIIDR;
}
/**
* @brief PHY address detection.
*/
static void mii_find_phy(void) {
uint32_t i;
for (i = 0; i < 31; i++) {
ETH->MACMIIDR = (i << 6) | MACMIIDR_CR;
if ((mii_read_phy(MII_PHYSID1) == (BOARD_PHY_ID >> 16)) &&
(mii_read_phy(MII_PHYSID2) == (BOARD_PHY_ID & 0xFFF0))) {
phyaddr = i << 11;
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(&ETHD1);
/* 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 = STM32_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];
}
/* MAC clocks activation.*/
rccEnableETH(FALSE);
/* Reset of the MAC core.*/
rccResetETH();
/* Find PHY address.*/
mii_find_phy();
#if defined(BOARD_PHY_RESET)
/* PHY board-specific reset procedure.*/
BOARD_PHY_RESET();
#else
/* PHY soft reset procedure.*/
mii_write_phy(MII_BMCR, BMCR_RESET);
while (mii_read_phy(MII_BMCR) & BMCR_RESET)
;
#endif
/* PHY in power down mode until the driver will be started.*/
mii_write_phy(MII_BMCR, BMCR_PDOWN);
/* MAC clocks stopped again.*/
rccDisableETH(FALSE);
}
/**
* @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 = STM32_RDES0_OWN;
rxptr = (stm32_eth_rx_descriptor_t *)rd;
for (i = 0; i < MAC_TRANSMIT_BUFFERS; i++)
td[i].tdes0 = STM32_TDES0_TCH;
txptr = (stm32_eth_tx_descriptor_t *)td;
/* MAC clocks activation.*/
rccEnableETH(FALSE);
/* Descriptor chains pointers.*/
ETH->DMARDLAR = (uint32_t)rd;
ETH->DMATDLAR = (uint32_t)rd;
/* MAC configuration:
ETH_MACCR_TE - Transmitter enable.
ETH_MACCR_RE - Receiver enable.
Note that the complete setup of the MAC is performed when the link
status is detected.*/
ETH->MACCR = ETH_MACCR_TE | ETH_MACCR_TE;
ETH->MACFFR = 0;
ETH->MACHTHR = 0;
ETH->MACHTLR = 0;
ETH->MACHTLR = 0;
ETH->MACFCR = 0;
ETH->MACVLANTR = 0;
}
/**
* @brief Deactivates the MAC peripheral.
*
* @param[in] macp pointer to the @p MACDriver object
*
* @notapi
*/
void mac_lld_stop(MACDriver *macp) {
/* MAC clocks stopped.*/
rccDisableETH(FALSE);
}
/**
* @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 */
/** @} */
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