init_ethernet

#include <net_config.h>

void init_ethernet (void);

The init_ethernet function initializes the ethernet controller. The function:

• enables the sending and receiving of packets
• sets the MAC ethernet address
• sets the interrupt configuration registers of the ethernet controller if the ethernet controller is configured for interrupt mode.

The init_ethernet function is part of RL-TCPnet. The prototype is defined in net_config.h.

note

• The MAC address of the ethernet interface is typically configured by writing the six byte MAC address into the dedicated registers of the ethernet controller.
• You must provide the init_ethernet function if the ethernet controller you use is different from the ones provided in the TCPnet source.
• The TcpNet system frequently calls init_ethernet during its startup.

The init_ethernet function does not return any value.

interrupt_ethernet, poll_ethernet, send_frame

void init_ethernet (void) {
  /* Initialize the EMAC ethernet controller. */
  U32 regv,tout,id1,id2;

  /* Power Up the EMAC controller. */
  PCONP |= 0x40000000;

  /* Enable P1 Ethernet Pins. */
  if (MAC_MODULEID == OLD_EMAC_MODULE_ID) {
    /* For the first silicon rev.'-' ID P1.6 should be set. */
    PINSEL2 = 0x50151105;
  }
  else {
    /* on rev. 'A' and later, P1.6 should NOT be set. */
    PINSEL2 = 0x50150105;
  }
  PINSEL3 = (PINSEL3 & ~0x0000000F) | 0x00000005;

  /* Reset all EMAC internal modules. */
  MAC_MAC1 = MAC1_RES_TX | MAC1_RES_MCS_TX | MAC1_RES_RX | MAC1_RES_MCS_RX |
             MAC1_SIM_RES | MAC1_SOFT_RES;
  MAC_COMMAND = CR_REG_RES | CR_TX_RES | CR_RX_RES;

  /* A short delay after reset. */
  for (tout = 100; tout; tout--);

  /* Initialize MAC control registers. */
  MAC_MAC1 = MAC1_PASS_ALL;
  MAC_MAC2 = MAC2_CRC_EN | MAC2_PAD_EN;
  MAC_MAXF = ETH_MAX_FLEN;
  MAC_CLRT = CLRT_DEF;
  MAC_IPGR = IPGR_DEF;

  /* Enable Reduced MII interface. */
  MAC_COMMAND = CR_RMII | CR_PASS_RUNT_FRM;

  /* Reset Reduced MII Logic. */
  MAC_SUPP = SUPP_RES_RMII;
  for (tout = 100; tout; tout--);
  MAC_SUPP = 0;

  /* Put the DP83848C in reset mode */
  write_PHY (PHY_REG_BMCR, 0x8000);

  /* Wait for hardware reset to end. */
  for (tout = 0; tout < 0x100000; tout++) {
    regv = read_PHY (PHY_REG_BMCR);
    if (!(regv & 0x8800)) {
      /* Reset complete, device not Power Down. */
      break;
    }
  }

  /* Check if this is a DP83848C PHY. */
  id1 = read_PHY (PHY_REG_IDR1);
  id2 = read_PHY (PHY_REG_IDR2);

  if (((id1 << 16) | (id2 & 0xFFF0)) == DP83848C_ID) {
    /* Configure the PHY device */
#if defined (_10MBIT_)
    /* Connect at 10MBit */
    write_PHY (PHY_REG_BMCR, PHY_FULLD_10M);
#elif defined (_100MBIT_)
    /* Connect at 100MBit */
    write_PHY (PHY_REG_BMCR, PHY_FULLD_100M);
#else
    /* Use autonegotiation about the link speed. */
    write_PHY (PHY_REG_BMCR, PHY_AUTO_NEG);
    /* Wait to complete Auto_Negotiation. */
    for (tout = 0; tout < 0x100000; tout++) {
      regv = read_PHY (PHY_REG_BMSR);
      if (regv & 0x0020) {
        /* Autonegotiation Complete. */
        break;
      }
    }
#endif
  }

  /* Check the link status. */
  for (tout = 0; tout < 0x10000; tout++) {
    regv = read_PHY (PHY_REG_STS);
    if (regv & 0x0001) {
      /* Link is on. */
      break;
    }
  }

  /* Configure Full/Half Duplex mode. */
  if (regv & 0x0004) {
    /* Full duplex is enabled. */
    MAC_MAC2    |= MAC2_FULL_DUP;
    MAC_COMMAND |= CR_FULL_DUP;
    MAC_IPGT     = IPGT_FULL_DUP;
  }
  else {
    /* Half duplex mode. */
    MAC_IPGT = IPGT_HALF_DUP;
  }

  /* Configure 100MBit/10MBit mode. */
  if (regv & 0x0002) {
    /* 10MBit mode. */
    MAC_SUPP = 0;
  }
  else {
    /* 100MBit mode. */
    MAC_SUPP = SUPP_SPEED;
  }

  /* Set the Ethernet MAC Address registers */
  MAC_SA0 = ((U32)own_hw_adr[5] << 8) | (U32)own_hw_adr[4];
  MAC_SA1 = ((U32)own_hw_adr[3] << 8) | (U32)own_hw_adr[2];
  MAC_SA2 = ((U32)own_hw_adr[1] << 8) | (U32)own_hw_adr[0];

  /* Initialize Tx and Rx DMA Descriptors */
  rx_descr_init ();
  tx_descr_init ();

  /* Receive Broadcast, Multicast and Perfect Match Packets */
  MAC_RXFILTERCTRL = RFC_MCAST_EN | RFC_BCAST_EN | RFC_PERFECT_EN;

  /* Enable EMAC interrupts. */
  MAC_INTENABLE = INT_RX_DONE | INT_TX_DONE;

  /* Reset all interrupts */
  MAC_INTCLEAR  = 0xFFFF;

  /* Enable receive and transmit mode of MAC Ethernet core */
  MAC_COMMAND  |= (CR_RX_EN | CR_TX_EN);
  MAC_MAC1     |= MAC1_REC_EN;

  /* Configure VIC for EMAC interrupt. */
  VICVectAddr21 = (U32)interrupt_ethernet;
}