Diff: cyclone_tcp/drivers/dp83848.c

Revision:

0:8918a71cdbe9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cyclone_tcp/drivers/dp83848.c	Sat Feb 04 18:15:49 2017 +0000
@@ -0,0 +1,268 @@
+/**
+ * @file dp83848.c
+ * @brief DP83848 Ethernet PHY transceiver
+ *
+ * @section License
+ *
+ * Copyright (C) 2010-2017 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 1.7.6
+ **/
+
+//Switch to the appropriate trace level
+#define TRACE_LEVEL NIC_TRACE_LEVEL
+
+//Dependencies
+#include "core/net.h"
+#include "drivers/dp83848.h"
+#include "debug.h"
+
+
+/**
+ * @brief DP83848 Ethernet PHY driver
+ **/
+
+const PhyDriver dp83848PhyDriver =
+{
+   dp83848Init,
+   dp83848Tick,
+   dp83848EnableIrq,
+   dp83848DisableIrq,
+   dp83848EventHandler,
+};
+
+
+/**
+ * @brief DP83848 PHY transceiver initialization
+ * @param[in] interface Underlying network interface
+ * @return Error code
+ **/
+
+error_t dp83848Init(NetInterface *interface)
+{
+   //Debug message
+   TRACE_INFO("Initializing DP83848...\r\n");
+
+   //Initialize external interrupt line driver
+   if(interface->extIntDriver != NULL)
+      interface->extIntDriver->init();
+
+   //Reset PHY transceiver
+   dp83848WritePhyReg(interface, DP83848_PHY_REG_BMCR, BMCR_RESET);
+   //Wait for the reset to complete
+   while(dp83848ReadPhyReg(interface, DP83848_PHY_REG_BMCR) & BMCR_RESET);
+
+   //Dump PHY registers for debugging purpose
+   dp83848DumpPhyReg(interface);
+
+   //Configure PWR_DOWN/INT pin as an interrupt output
+   dp83848WritePhyReg(interface, DP83848_PHY_REG_MICR, MICR_INTEN | MICR_INT_OE);
+   //The PHY will generate interrupts when link status changes are detected
+   dp83848WritePhyReg(interface, DP83848_PHY_REG_MISR, MISR_LINK_INT_EN);
+
+   //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 DP83848 timer handler
+ * @param[in] interface Underlying network interface
+ **/
+
+void dp83848Tick(NetInterface *interface)
+{
+   uint16_t value;
+   bool_t linkState;
+
+   //No external interrupt line driver?
+   if(interface->extIntDriver == NULL)
+   {
+      //Read basic status register
+      value = dp83848ReadPhyReg(interface, DP83848_PHY_REG_BMSR);
+      //Retrieve current link state
+      linkState = (value & BMSR_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 dp83848EnableIrq(NetInterface *interface)
+{
+   //Enable PHY transceiver interrupts
+   if(interface->extIntDriver != NULL)
+      interface->extIntDriver->enableIrq();
+}
+
+
+/**
+ * @brief Disable interrupts
+ * @param[in] interface Underlying network interface
+ **/
+
+void dp83848DisableIrq(NetInterface *interface)
+{
+   //Disable PHY transceiver interrupts
+   if(interface->extIntDriver != NULL)
+      interface->extIntDriver->disableIrq();
+}
+
+
+/**
+ * @brief DP83848 event handler
+ * @param[in] interface Underlying network interface
+ **/
+
+void dp83848EventHandler(NetInterface *interface)
+{
+   uint16_t status;
+
+   //Read status register to acknowledge the interrupt
+   status = dp83848ReadPhyReg(interface, DP83848_PHY_REG_MISR);
+
+   //Link status change?
+   if(status & MISR_LINK_INT)
+   {
+      //Read PHY status register
+      status = dp83848ReadPhyReg(interface, DP83848_PHY_REG_PHYSTS);
+
+      //Link is up?
+      if(status & PHYSTS_LINK_STATUS)
+      {
+         //Check current speed
+         if(status & PHYSTS_SPEED_STATUS)
+            interface->linkSpeed = NIC_LINK_SPEED_10MBPS;
+         else
+            interface->linkSpeed = NIC_LINK_SPEED_100MBPS;
+
+         //Check duplex mode
+         if(status & PHYSTS_DUPLEX_STATUS)
+            interface->duplexMode = NIC_FULL_DUPLEX_MODE;
+         else
+            interface->duplexMode = NIC_HALF_DUPLEX_MODE;
+
+         //Update link state
+         interface->linkState = TRUE;
+
+         //Adjust MAC configuration parameters for proper operation
+         interface->nicDriver->updateMacConfig(interface);
+      }
+      else
+      {
+         //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 address
+ * @param[in] data Register value
+ **/
+
+void dp83848WritePhyReg(NetInterface *interface, uint8_t address, uint16_t data)
+{
+   uint8_t phyAddr;
+
+   //Get the address of the PHY transceiver
+   if(interface->phyAddr < 32)
+      phyAddr = interface->phyAddr;
+   else
+      phyAddr = DP83848_PHY_ADDR;
+
+   //Write the specified PHY register
+   interface->nicDriver->writePhyReg(phyAddr, address, data);
+}
+
+
+/**
+ * @brief Read PHY register
+ * @param[in] interface Underlying network interface
+ * @param[in] address PHY register address
+ * @return Register value
+ **/
+
+uint16_t dp83848ReadPhyReg(NetInterface *interface, uint8_t address)
+{
+   uint8_t phyAddr;
+
+   //Get the address of the PHY transceiver
+   if(interface->phyAddr < 32)
+      phyAddr = interface->phyAddr;
+   else
+      phyAddr = DP83848_PHY_ADDR;
+
+   //Read the specified PHY register
+   return interface->nicDriver->readPhyReg(phyAddr, address);
+}
+
+
+/**
+ * @brief Dump PHY registers for debugging purpose
+ * @param[in] interface Underlying network interface
+ **/
+
+void dp83848DumpPhyReg(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, dp83848ReadPhyReg(interface, i));
+   }
+
+   //Terminate with a line feed
+   TRACE_DEBUG("\r\n");
+}
+