st802rt1a_driver.c

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/**
 * @file st802rt1a_driver.c
 * @brief ST802RT1A Ethernet PHY driver
 *
 * @section License
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Copyright (C) 2010-2024 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneTCP Open.
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.4.4
 **/
 
//Switch to the appropriate trace level
#define TRACE_LEVEL NIC_TRACE_LEVEL
 
//Dependencies
#include "core/net.h"
#include "drivers/phy/st802rt1a_driver.h"
#include "debug.h"
 
 
/**
 * @brief ST802RT1A Ethernet PHY driver
 **/
 
const PhyDriver st802rt1aPhyDriver =
{
   st802rt1aInit,
   st802rt1aTick,
   st802rt1aEnableIrq,
   st802rt1aDisableIrq,
   st802rt1aEventHandler
};
 
 
/**
 * @brief ST802RT1A PHY transceiver initialization
 * @param[in] interface Underlying network interface
 * @return Error code
 **/
 
error_t st802rt1aInit(NetInterface *interface)
{
   //Debug message
   TRACE_INFO("Initializing ST802RT1A...\r\n");
 
   //Undefined PHY address?
   if(interface->phyAddr >= 32)
   {
      //Use the default address
      interface->phyAddr = ST802RT1A_PHY_ADDR;
   }
 
   //Initialize serial management interface
   if(interface->smiDriver != NULL)
   {
      interface->smiDriver->init();
   }
 
   //Reset PHY transceiver
   st802rt1aWritePhyReg(interface, ST802RT1A_CNTRL, ST802RT1A_CNTRL_RESET);
 
   //Wait for the reset to complete
   while(st802rt1aReadPhyReg(interface, ST802RT1A_CNTRL) & ST802RT1A_CNTRL_RESET)
   {
   }
 
   //Dump PHY registers for debugging purpose
   st802rt1aDumpPhyReg(interface);
 
   //Perform custom configuration
   st802rt1aInitHook(interface);
 
   //Force the TCP/IP stack to poll the link state at startup
   interface->phyEvent = TRUE;
   //Notify the TCP/IP stack of the event
   osSetEvent(&netEvent);
 
   //Successful initialization
   return NO_ERROR;
}
 
 
/**
 * @brief ST802RT1A custom configuration
 * @param[in] interface Underlying network interface
 **/
 
__weak_func void st802rt1aInitHook(NetInterface *interface)
{
}
 
 
/**
 * @brief ST802RT1A timer handler
 * @param[in] interface Underlying network interface
 **/
 
void st802rt1aTick(NetInterface *interface)
{
   uint16_t value;
   bool_t linkState;
 
   //Read status register
   value = st802rt1aReadPhyReg(interface, ST802RT1A_STATS);
   //Retrieve current link state
   linkState = (value & ST802RT1A_STATS_LINK_STATUS) ? TRUE : FALSE;
 
   //Link up event?
   if(linkState && !interface->linkState)
   {
      //Set event flag
      interface->phyEvent = TRUE;
      //Notify the TCP/IP stack of the event
      osSetEvent(&netEvent);
   }
   //Link down event?
   else if(!linkState && interface->linkState)
   {
      //Set event flag
      interface->phyEvent = TRUE;
      //Notify the TCP/IP stack of the event
      osSetEvent(&netEvent);
   }
}
 
 
/**
 * @brief Enable interrupts
 * @param[in] interface Underlying network interface
 **/
 
void st802rt1aEnableIrq(NetInterface *interface)
{
}
 
 
/**
 * @brief Disable interrupts
 * @param[in] interface Underlying network interface
 **/
 
void st802rt1aDisableIrq(NetInterface *interface)
{
}
 
 
/**
 * @brief ST802RT1A event handler
 * @param[in] interface Underlying network interface
 **/
 
void st802rt1aEventHandler(NetInterface *interface)
{
   uint16_t value;
   bool_t linkState;
 
   //Read status register
   value = st802rt1aReadPhyReg(interface, ST802RT1A_STATS);
   //Retrieve current link state
   linkState = (value & ST802RT1A_STATS_LINK_STATUS) ? TRUE : FALSE;
 
   //Link is up?
   if(linkState && !interface->linkState)
   {
      //Read RN13 register
      value = st802rt1aReadPhyReg(interface, ST802RT1A_XCCNT);
 
      //Check current operation mode
      switch(value & ST802RT1A_XCCNT_CMODE)
      {
      //10BASE-T half-duplex
      case ST802RT1A_XCCNT_CMODE_10BT_HD:
         interface->linkSpeed = NIC_LINK_SPEED_10MBPS;
         interface->duplexMode = NIC_HALF_DUPLEX_MODE;
         break;
 
      //10BASE-T full-duplex
      case ST802RT1A_XCCNT_CMODE_10BT_FD:
         interface->linkSpeed = NIC_LINK_SPEED_10MBPS;
         interface->duplexMode = NIC_FULL_DUPLEX_MODE;
         break;
 
      //100BASE-TX half-duplex
      case ST802RT1A_XCCNT_CMODE_100BTX_HD:
         interface->linkSpeed = NIC_LINK_SPEED_100MBPS;
         interface->duplexMode = NIC_HALF_DUPLEX_MODE;
         break;
 
      //100BASE-TX full-duplex
      case ST802RT1A_XCCNT_CMODE_100BTX_FD:
         interface->linkSpeed = NIC_LINK_SPEED_100MBPS;
         interface->duplexMode = NIC_FULL_DUPLEX_MODE;
         break;
 
      //Unknown operation mode
      default:
         //Debug message
         TRACE_WARNING("Invalid operation mode!\r\n");
         break;
      }
 
      //Update link state
      interface->linkState = TRUE;
 
      //Adjust MAC configuration parameters for proper operation
      interface->nicDriver->updateMacConfig(interface);
 
      //Process link state change event
      nicNotifyLinkChange(interface);
   }
   //Link is down?
   else if(!linkState && interface->linkState)
   {
      //Update link state
      interface->linkState = FALSE;
 
      //Process link state change event
      nicNotifyLinkChange(interface);
   }
}
 
 
/**
 * @brief Write PHY register
 * @param[in] interface Underlying network interface
 * @param[in] address PHY register Register address
 * @param[in] data Register value
 **/
 
void st802rt1aWritePhyReg(NetInterface *interface, uint8_t address,
   uint16_t data)
{
   //Write the specified PHY register
   if(interface->smiDriver != NULL)
   {
      interface->smiDriver->writePhyReg(SMI_OPCODE_WRITE,
         interface->phyAddr, address, data);
   }
   else
   {
      interface->nicDriver->writePhyReg(SMI_OPCODE_WRITE,
         interface->phyAddr, address, data);
   }
}
 
 
/**
 * @brief Read PHY register
 * @param[in] interface Underlying network interface
 * @param[in] address PHY register address
 * @return Register value
 **/
 
uint16_t st802rt1aReadPhyReg(NetInterface *interface, uint8_t address)
{
   uint16_t data;
 
   //Read the specified PHY register
   if(interface->smiDriver != NULL)
   {
      data = interface->smiDriver->readPhyReg(SMI_OPCODE_READ,
         interface->phyAddr, address);
   }
   else
   {
      data = interface->nicDriver->readPhyReg(SMI_OPCODE_READ,
         interface->phyAddr, address);
   }
 
   //Return the value of the PHY register
   return data;
}
 
 
/**
 * @brief Dump PHY registers for debugging purpose
 * @param[in] interface Underlying network interface
 **/
 
void st802rt1aDumpPhyReg(NetInterface *interface)
{
   uint8_t i;
 
   //Loop through PHY registers
   for(i = 0; i < 32; i++)
   {
      //Display current PHY register
      TRACE_DEBUG("%02" PRIu8 ": 0x%04" PRIX16 "\r\n", i,
         st802rt1aReadPhyReg(interface, i));
   }
 
   //Terminate with a line feed
   TRACE_DEBUG("\r\n");
}