Diff: EthernetInterface/lwip-eth/arch/TARGET_K64F/k64f_emac.c

Revision:

9:58eb378727d9

Parent:

8:80d49dd91542

Child:

10:0b5e0dfee08e

--- a/EthernetInterface/lwip-eth/arch/TARGET_K64F/k64f_emac.c	Wed Oct 01 13:27:35 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,880 +0,0 @@
-#include "lwip/opt.h"
-#include "lwip/sys.h"
-#include "lwip/def.h"
-#include "lwip/mem.h"
-#include "lwip/pbuf.h"
-#include "lwip/stats.h"
-#include "lwip/snmp.h"
-#include "lwip/tcpip.h"
-#include "netif/etharp.h"
-#include "netif/ppp_oe.h"
-
-#include "eth_arch.h"
-#include "sys_arch.h"
-
-#include "fsl_enet_driver.h"
-#include "fsl_enet_hal.h"
-#include "fsl_device_registers.h"
-#include "fsl_phy_driver.h"
-#include "fsl_interrupt_manager.h"
-#include "k64f_emac_config.h"
-#include <ctype.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-#include "mbed_interface.h"
-
-extern IRQn_Type enet_irq_ids[HW_ENET_INSTANCE_COUNT][FSL_FEATURE_ENET_INTERRUPT_COUNT];
-extern uint8_t enetIntMap[kEnetIntNum];
-extern void *enetIfHandle;
-
-/********************************************************************************
- * Internal data
- ********************************************************************************/
-
-extern void k64f_init_eth_hardware(void);
-
-/* K64F EMAC driver data structure */
-struct k64f_enetdata {
-  struct netif *netif;  /**< Reference back to LWIP parent netif */
-  sys_sem_t RxReadySem; /**< RX packet ready semaphore */
-  sys_sem_t TxCleanSem; /**< TX cleanup thread wakeup semaphore */
-  sys_mutex_t TXLockMutex; /**< TX critical section mutex */
-  sys_sem_t xTXDCountSem; /**< TX free buffer counting semaphore */
-  volatile u32_t rx_free_descs; /**< Count of free RX descriptors */
-  struct pbuf *rxb[ENET_RX_RING_LEN]; /**< RX pbuf pointer list, zero-copy mode */
-  uint8_t *rx_desc_start_addr; /**< RX descriptor start address */
-  uint8_t *tx_desc_start_addr; /**< TX descriptor start address */
-  uint8_t tx_consume_index, tx_produce_index; /**< TX buffers ring */
-  uint8_t rx_fill_index; /**< RX ring fill index */
-  struct pbuf *txb[ENET_TX_RING_LEN]; /**< TX pbuf pointer list, zero-copy mode */
-  void *txb_aligned[ENET_TX_RING_LEN]; /**< TX aligned buffers (if needed) */
-};
-
-static struct k64f_enetdata k64f_enetdata;
-
-static enet_dev_if_t enetDevIf[HW_ENET_INSTANCE_COUNT];
-static enet_mac_config_t g_enetMacCfg[HW_ENET_INSTANCE_COUNT] = 
-{
-  {
-    ENET_ETH_MAX_FLEN ,  /*!< enet receive buffer size*/
-    ENET_RX_LARGE_BUFFER_NUM, /*!< enet large receive buffer number*/
-    ENET_RX_RING_LEN,        /*!< enet receive bd number*/
-    ENET_TX_RING_LEN,        /*!< enet transmit bd number*/
-    {0},                /*!< enet mac address*/
-    kEnetCfgRmii,       /*!< enet rmii interface*/
-    kEnetCfgSpeed100M,  /*!< enet rmii 100M*/
-    kEnetCfgFullDuplex, /*!< enet rmii Full- duplex*/
-     /*!< enet mac control flag recommended to use enet_mac_control_flag_t
-      we send frame with crc so receive crc forward for data length check test*/
-    kEnetRxCrcFwdEnable | kEnetRxFlowControlEnable,
-    true,         /*!< enet txaccelerator enabled*/
-    true,        /*!< enet rxaccelerator enabled*/
-    false,        /*!< enet store and forward*/
-    {false, false, true, false, true},  /*!< enet rxaccelerator config*/
-    {false, false, true},          /*!< enet txaccelerator config*/
-    true,               /*!< vlan frame support*/
-    true,               /*!< phy auto discover*/
-    ENET_MII_CLOCK,     /*!< enet MDC clock*/
-  },
-};
-
-static enet_phy_config_t g_enetPhyCfg[HW_ENET_INSTANCE_COUNT] =
-{
-  {0, false}
-};
-
-/** \brief  Driver transmit and receive thread priorities
- *
- * Thread priorities for receive thread and TX cleanup thread. Alter
- * to prioritize receive or transmit bandwidth. In a heavily loaded
- * system or with LEIP_DEBUG enabled, the priorities might be better
- * the same. */
-#define RX_PRIORITY   (osPriorityNormal)
-#define TX_PRIORITY   (osPriorityNormal)
-#define PHY_PRIORITY  (osPriorityNormal)
-
-/** \brief  Debug output formatter lock define
- *
- * When using FreeRTOS and with LWIP_DEBUG enabled, enabling this
- * define will allow RX debug messages to not interleave with the
- * TX messages (so they are actually readable). Not enabling this
- * define when the system is under load will cause the output to
- * be unreadable. There is a small tradeoff in performance for this
- * so use it only for debug. */
-//#define LOCK_RX_THREAD
-
-/** \brief  Signal used for ethernet ISR to signal packet_rx() thread.
- */
-#define RX_SIGNAL  1
-
-// K64F-specific macros
-#define RX_PBUF_AUTO_INDEX    (-1)
-
-/********************************************************************************
- * Buffer management
- ********************************************************************************/
-
-/** \brief  Queues a pbuf into the RX descriptor list
- *
- *  \param[in] k64f_enet Pointer to the drvier data structure
- *  \param[in] p         Pointer to pbuf to queue
- *  \param[in] bidx      Index to queue into   
- */
-static void k64f_rxqueue_pbuf(struct k64f_enetdata *k64f_enet, struct pbuf *p, int bidx)
-{
-  enet_bd_struct_t *start = (enet_bd_struct_t *)k64f_enet->rx_desc_start_addr;
-  int idx;
-
-  /* Get next free descriptor index */
-  if (bidx == RX_PBUF_AUTO_INDEX)
-    idx = k64f_enet->rx_fill_index;
-  else
-    idx = bidx;
-
-  /* Setup descriptor and clear statuses */
-  enet_hal_init_rxbds(start + idx, (uint8_t*)p->payload, idx == ENET_RX_RING_LEN - 1);
-
-  /* Save pbuf pointer for push to network layer later */
-  k64f_enet->rxb[idx] = p;
-
-  /* Wrap at end of descriptor list */
-  idx = (idx + 1) % ENET_RX_RING_LEN;
-
-  /* Queue descriptor(s) */
-  k64f_enet->rx_free_descs -= 1;
-
-  if (bidx == RX_PBUF_AUTO_INDEX)
-    k64f_enet->rx_fill_index = idx;
-
-  enet_hal_active_rxbd(BOARD_DEBUG_ENET_INSTANCE);
-
-  LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-    ("k64f_rxqueue_pbuf: pbuf packet queued: %p (free desc=%d)\n", p,
-      k64f_enet->rx_free_descs));
-}
-
-/** \brief  Attempt to allocate and requeue a new pbuf for RX
- *
- *  \param[in]     netif Pointer to the netif structure
- *  \returns       number of queued packets
- */
-s32_t k64f_rx_queue(struct netif *netif, int idx)
-{
-  struct k64f_enetdata *k64f_enet = netif->state;
-  enet_dev_if_t *enetIfPtr = (enet_dev_if_t *)&enetDevIf[BOARD_DEBUG_ENET_INSTANCE];
-  struct pbuf *p;
-  int queued = 0;
-
-  /* Attempt to requeue as many packets as possible */
-  while (k64f_enet->rx_free_descs > 0) {
-    /* Allocate a pbuf from the pool. We need to allocate at the
-       maximum size as we don't know the size of the yet to be
-       received packet. */
-    p = pbuf_alloc(PBUF_RAW, enetIfPtr->macCfgPtr->rxBufferSize + RX_BUF_ALIGNMENT, PBUF_RAM);
-    if (p == NULL) {
-      LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-        ("k64_rx_queue: could not allocate RX pbuf (free desc=%d)\n",
-        k64f_enet->rx_free_descs));
-      return queued;
-    }
-    /* K64F note: the next line ensures that the RX buffer is properly aligned for the K64F
-       RX descriptors (16 bytes alignment). However, by doing so, we're effectively changing
-       a data structure which is internal to lwIP. This might not prove to be a good idea
-       in the long run, but a better fix would probably involve modifying lwIP itself */
-    p->payload = (void*)ENET_ALIGN((uint32_t)p->payload, RX_BUF_ALIGNMENT);
-    
-    /* pbufs allocated from the RAM pool should be non-chained. */
-    LWIP_ASSERT("k64f_rx_queue: pbuf is not contiguous (chained)", pbuf_clen(p) <= 1);
-
-    /* Queue packet */
-    k64f_rxqueue_pbuf(k64f_enet, p, idx);
-    queued++;
-  }
-
-  return queued;
-}
-
-/** \brief  Sets up the RX descriptor ring buffers.
- *
- *  This function sets up the descriptor list used for receive packets.
- *
- *  \param[in]  netif  Pointer to driver data structure
- *  \returns           ERR_MEM if out of memory, ERR_OK otherwise
- */
-static err_t k64f_rx_setup(struct netif *netif, enet_rxbd_config_t *rxbdCfg) {   
-  struct k64f_enetdata *k64f_enet = netif->state;
-  enet_dev_if_t *enetIfPtr = (enet_dev_if_t *)&enetDevIf[BOARD_DEBUG_ENET_INSTANCE];
-  uint8_t *rxBdPtr;
-  uint32_t rxBufferSizeAligned;
-
-  // Allocate RX descriptors
-  rxBdPtr = (uint8_t *)calloc(1, enet_hal_get_bd_size() * enetIfPtr->macCfgPtr->rxBdNumber + ENET_BD_ALIGNMENT);
-  if(!rxBdPtr)
-      return ERR_MEM;
-  k64f_enet->rx_desc_start_addr = (uint8_t *)ENET_ALIGN((uint32_t)rxBdPtr, ENET_BD_ALIGNMENT);
-  k64f_enet->rx_free_descs = enetIfPtr->macCfgPtr->rxBdNumber;
-  k64f_enet->rx_fill_index = 0;
-
-  rxBufferSizeAligned = ENET_ALIGN(enetIfPtr->macCfgPtr->rxBufferSize, ENET_RX_BUFFER_ALIGNMENT);
-  enetIfPtr->macContextPtr->rxBufferSizeAligned = rxBufferSizeAligned;
-  rxbdCfg->rxBdPtrAlign = k64f_enet->rx_desc_start_addr;
-  rxbdCfg->rxBdNum = enetIfPtr->macCfgPtr->rxBdNumber;
-  rxbdCfg->rxBufferNum = enetIfPtr->macCfgPtr->rxBdNumber;
-  
-  k64f_rx_queue(netif, RX_PBUF_AUTO_INDEX);
-  return ERR_OK;
-}
-
-/** \brief  Sets up the TX descriptor ring buffers.
- *
- *  This function sets up the descriptor list used for transmit packets.
- *
- *  \param[in]      netif  Pointer to driver data structure
- *  \returns               ERR_MEM if out of memory, ERR_OK otherwise
- */
-static err_t k64f_tx_setup(struct netif *netif, enet_txbd_config_t *txbdCfg) {
-  struct k64f_enetdata *k64f_enet = netif->state;
-  enet_dev_if_t *enetIfPtr = (enet_dev_if_t *)&enetDevIf[BOARD_DEBUG_ENET_INSTANCE];
-  uint8_t *txBdPtr;
-
-  // Allocate TX descriptors
-  txBdPtr = (uint8_t *)calloc(1, enet_hal_get_bd_size() * enetIfPtr->macCfgPtr->txBdNumber + ENET_BD_ALIGNMENT);
-  if(!txBdPtr)
-    return ERR_MEM;
-
-  k64f_enet->tx_desc_start_addr = (uint8_t *)ENET_ALIGN((uint32_t)txBdPtr, ENET_BD_ALIGNMENT);
-  k64f_enet->tx_consume_index = k64f_enet->tx_produce_index = 0;
-
-  txbdCfg->txBdPtrAlign = k64f_enet->tx_desc_start_addr;
-  txbdCfg->txBufferNum = enetIfPtr->macCfgPtr->txBdNumber;
-  txbdCfg->txBufferSizeAlign = ENET_ALIGN(enetIfPtr->maxFrameSize, ENET_TX_BUFFER_ALIGNMENT);
-
-  // Make the TX descriptor ring circular
-  enet_hal_init_txbds(k64f_enet->tx_desc_start_addr + enet_hal_get_bd_size() * (ENET_TX_RING_LEN - 1), 1);
-
-  return ERR_OK;
-}
-
-/** \brief  Free TX buffers that are complete
- *
- *  \param[in] k64f_enet  Pointer to driver data structure
- */
-static void k64f_tx_reclaim(struct k64f_enetdata *k64f_enet)
-{
-  uint8_t i;
-  volatile enet_bd_struct_t * bdPtr = (enet_bd_struct_t *)k64f_enet->tx_desc_start_addr;
-
-  /* Get exclusive access */
-  sys_mutex_lock(&k64f_enet->TXLockMutex);
-
-  // Traverse all descriptors, looking for the ones modified by the uDMA
-  i = k64f_enet->tx_consume_index;
-  while(i != k64f_enet->tx_produce_index) {
-    if (bdPtr[i].controlExtend2 & TX_DESC_UPDATED_MASK) { // descriptor updated by uDMA
-      if (k64f_enet->txb_aligned[i]) {
-        free(k64f_enet->txb_aligned[i]);
-        k64f_enet->txb_aligned[i] = NULL;
-      } else if (k64f_enet->txb[i]) {
-        pbuf_free(k64f_enet->txb[i]);
-        k64f_enet->txb[i] = NULL;
-      }
-      osSemaphoreRelease(k64f_enet->xTXDCountSem.id);
-      bdPtr[i].controlExtend2 &= ~TX_DESC_UPDATED_MASK;
-    }
-    i = (i + 1) % ENET_TX_RING_LEN;
-  }
-  k64f_enet->tx_consume_index = i;
-
-  /* Restore access */
-  sys_mutex_unlock(&k64f_enet->TXLockMutex);
-}
-
-/** \brief  Low level init of the MAC and PHY.
- *
- *  \param[in]      netif  Pointer to LWIP netif structure
- */
-static err_t low_level_init(struct netif *netif)
-{
-  enet_dev_if_t * enetIfPtr;
-  uint32_t device = BOARD_DEBUG_ENET_INSTANCE;
-  enet_rxbd_config_t rxbdCfg;
-  enet_txbd_config_t txbdCfg;
-  enet_phy_speed_t phy_speed;
-  enet_phy_duplex_t phy_duplex;
-
-  k64f_init_eth_hardware();
-  
-  /* Initialize device*/
-  enetIfPtr = (enet_dev_if_t *)&enetDevIf[device];
-  enetIfPtr->deviceNumber = device;
-  enetIfPtr->macCfgPtr = &g_enetMacCfg[device];
-  enetIfPtr->phyCfgPtr = &g_enetPhyCfg[device];
-  enetIfPtr->macApiPtr = &g_enetMacApi;
-  enetIfPtr->phyApiPtr = (void *)&g_enetPhyApi;
-  memcpy(enetIfPtr->macCfgPtr->macAddr, (char*)netif->hwaddr, kEnetMacAddrLen);
-
-  /* Allocate buffer for ENET mac context*/
-  enetIfPtr->macContextPtr = (enet_mac_context_t *)calloc(1, sizeof(enet_mac_context_t));
-  if (!enetIfPtr->macContextPtr) {
-    return ERR_BUF;
-  }  
-
-  /* Initialize enet buffers*/
-  if(k64f_rx_setup(netif, &rxbdCfg) != ERR_OK) {
-    return ERR_BUF;
-  }
-  /* Initialize enet buffers*/
-  if(k64f_tx_setup(netif, &txbdCfg) != ERR_OK) {
-    return ERR_BUF;
-  }
-  /* Initialize enet module*/
-  if (enet_mac_init(enetIfPtr, &rxbdCfg, &txbdCfg) == kStatus_ENET_Success)
-  {
-    /* Initialize PHY*/
-    if (enetIfPtr->macCfgPtr->isPhyAutoDiscover) {
-      if (((enet_phy_api_t *)(enetIfPtr->phyApiPtr))->phy_auto_discover(enetIfPtr) != kStatus_PHY_Success)
-        return ERR_IF;
-    }
-    if (((enet_phy_api_t *)(enetIfPtr->phyApiPtr))->phy_init(enetIfPtr) != kStatus_PHY_Success)
-      return ERR_IF;
-
-    enetIfPtr->isInitialized = true;
-  }
-  else
-  {
-    // TODOETH: cleanup memory
-    return ERR_IF;
-  }
-
-  /* Get link information from PHY */
-  phy_get_link_speed(enetIfPtr, &phy_speed);
-  phy_get_link_duplex(enetIfPtr, &phy_duplex);
-  BW_ENET_RCR_RMII_10T(enetIfPtr->deviceNumber, phy_speed == kEnetSpeed10M ? kEnetCfgSpeed10M : kEnetCfgSpeed100M);
-  BW_ENET_TCR_FDEN(enetIfPtr->deviceNumber, phy_duplex == kEnetFullDuplex ? kEnetCfgFullDuplex : kEnetCfgHalfDuplex);
-
-  /* Enable Ethernet module*/
-  enet_hal_config_ethernet(device, true, true);
-
-  /* Active Receive buffer descriptor must be done after module enable*/
-  enet_hal_active_rxbd(enetIfPtr->deviceNumber);
-
-  return ERR_OK;
-}
-
-/********************************************************************************
- * LWIP port
- ********************************************************************************/
-
-/** \brief Ethernet receive interrupt handler
- *
- *  This function handles the receive interrupt of K64F.
- */
-void enet_mac_rx_isr(void *enetIfPtr)
-{
-  /* Clear interrupt */
-  enet_hal_clear_interrupt(((enet_dev_if_t *)enetIfPtr)->deviceNumber, kEnetRxFrameInterrupt);
-  sys_sem_signal(&k64f_enetdata.RxReadySem);
-}
-
-void enet_mac_tx_isr(void *enetIfPtr)
-{
-  /*Clear interrupt*/
-  enet_hal_clear_interrupt(((enet_dev_if_t *)enetIfPtr)->deviceNumber, kEnetTxFrameInterrupt);
-  sys_sem_signal(&k64f_enetdata.TxCleanSem);    
-}
-
-/**
- * This function is the ethernet packet send function. It calls
- * etharp_output after checking link status.
- *
- * \param[in] netif the lwip network interface structure for this enetif
- * \param[in] q Pointer to pbug to send
- * \param[in] ipaddr IP address
- * \return ERR_OK or error code
- */
-err_t k64f_etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
-{ 
-  /* Only send packet is link is up */
-  if (netif->flags & NETIF_FLAG_LINK_UP)
-    return etharp_output(netif, q, ipaddr);
-
-  return ERR_CONN;
-}
-
-/** \brief  Allocates a pbuf and returns the data from the incoming packet.
- *
- *  \param[in] netif the lwip network interface structure
- *  \param[in] idx   index of packet to be read
- *  \return a pbuf filled with the received packet (including MAC header)
- */
-static struct pbuf *k64f_low_level_input(struct netif *netif, int idx)
-{
-  struct k64f_enetdata *k64f_enet = netif->state;
-  enet_bd_struct_t * bdPtr = (enet_bd_struct_t*)k64f_enet->rx_desc_start_addr;
-  struct pbuf *p = NULL;
-  u32_t length = 0, orig_length;
-  const u16_t err_mask = kEnetRxBdTrunc | kEnetRxBdCrc | kEnetRxBdNoOctet | kEnetRxBdLengthViolation;
-
-#ifdef LOCK_RX_THREAD
-  /* Get exclusive access */
-  sys_mutex_lock(&k64f_enet->TXLockMutex);
-#endif
-
-  /* Determine if a frame has been received */
-  if ((bdPtr[idx].control & err_mask) != 0) {
-#if LINK_STATS
-    if ((bdPtr[idx].control & kEnetRxBdLengthViolation) != 0)
-      LINK_STATS_INC(link.lenerr);
-    else
-      LINK_STATS_INC(link.chkerr);
-#endif
-    LINK_STATS_INC(link.drop);
-
-    /* Re-queue the same buffer */
-    k64f_enet->rx_free_descs++;
-    p = k64f_enet->rxb[idx];
-    k64f_enet->rxb[idx] = NULL;
-    k64f_rxqueue_pbuf(k64f_enet, p, idx);
-    p = NULL;
-  } else {
-    /* A packet is waiting, get length */
-    length = enet_hal_get_bd_length(bdPtr + idx);
-
-    /* Zero-copy */
-    p = k64f_enet->rxb[idx];
-    orig_length = p->len;
-    p->len = (u16_t) length;
-
-    /* Free pbuf from descriptor */
-    k64f_enet->rxb[idx] = NULL;
-    k64f_enet->rx_free_descs++;
-    
-    /* Attempt to queue new buffer */
-    if (k64f_rx_queue(netif, idx) == 0) {
-      /* Drop frame (out of memory) */
-      LINK_STATS_INC(link.drop);
-
-      /* Re-queue the same buffer */
-      p->len = orig_length;
-      k64f_rxqueue_pbuf(k64f_enet, p, idx);
-
-      LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-        ("k64f_low_level_input: Packet index %d dropped for OOM\n",
-        idx));
-#ifdef LOCK_RX_THREAD
-      sys_mutex_unlock(&k64f_enet->TXLockMutex);
-#endif
-
-      return NULL;
-    }
-
-    LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-      ("k64f_low_level_input: Packet received: %p, size %d (index=%d)\n",
-      p, length, idx));
-
-    /* Save size */
-    p->tot_len = (u16_t) length;
-    LINK_STATS_INC(link.recv);
-  }
-
-#ifdef LOCK_RX_THREAD
-  sys_mutex_unlock(&k64f_enet->TXLockMutex);
-#endif
-
-  return p;
-}
-
-/** \brief  Attempt to read a packet from the EMAC interface.
- *
- *  \param[in] netif the lwip network interface structure
- *  \param[in] idx   index of packet to be read
- */
-void k64f_enetif_input(struct netif *netif, int idx)
-{
-  struct eth_hdr *ethhdr;
-  struct pbuf *p;
-
-  /* move received packet into a new pbuf */
-  p = k64f_low_level_input(netif, idx);
-  if (p == NULL)
-    return;
-
-  /* points to packet payload, which starts with an Ethernet header */
-  ethhdr = (struct eth_hdr*)p->payload;
-
-  switch (htons(ethhdr->type)) {
-    case ETHTYPE_IP:
-    case ETHTYPE_ARP:
-#if PPPOE_SUPPORT
-    case ETHTYPE_PPPOEDISC:
-    case ETHTYPE_PPPOE:
-#endif /* PPPOE_SUPPORT */
-      /* full packet send to tcpip_thread to process */
-      if (netif->input(p, netif) != ERR_OK) {
-        LWIP_DEBUGF(NETIF_DEBUG, ("k64f_enetif_input: IP input error\n"));
-        /* Free buffer */
-        pbuf_free(p);
-      }
-      break;
-
-    default:
-      /* Return buffer */
-      pbuf_free(p);
-      break;
-  }
-}
-
-/** \brief  Packet reception task
- *
- * This task is called when a packet is received. It will
- * pass the packet to the LWIP core.
- *
- *  \param[in] pvParameters pointer to the interface data
- */
-static void packet_rx(void* pvParameters) {
-  struct k64f_enetdata *k64f_enet = pvParameters;
-  volatile enet_bd_struct_t * bdPtr = (enet_bd_struct_t*)k64f_enet->rx_desc_start_addr;
-  int idx = 0;
-
-  while (1) {
-    /* Wait for receive task to wakeup */
-    sys_arch_sem_wait(&k64f_enet->RxReadySem, 0);
-
-    if ((bdPtr[idx].control & kEnetRxBdEmpty) == 0) {
-      k64f_enetif_input(k64f_enet->netif, idx);
-      idx = (idx + 1) % ENET_RX_RING_LEN;
-    }
-  }
-}
-
-/** \brief  Transmit cleanup task
- *
- * This task is called when a transmit interrupt occurs and
- * reclaims the pbuf and descriptor used for the packet once
- * the packet has been transferred.
- *
- *  \param[in] pvParameters pointer to the interface data
- */
-static void packet_tx(void* pvParameters) {
-  struct k64f_enetdata *k64f_enet = pvParameters;
-
-  while (1) {
-    /* Wait for transmit cleanup task to wakeup */
-    sys_arch_sem_wait(&k64f_enet->TxCleanSem, 0);
-    // TODOETH: handle TX underrun?
-    k64f_tx_reclaim(k64f_enet);
-  }
-}
-
- /** \brief  Polls if an available TX descriptor is ready. Can be used to
- *           determine if the low level transmit function will block.
- *
- *  \param[in] netif the lwip network interface structure
- *  \return 0 if no descriptors are read, or >0
- */
-s32_t k64f_tx_ready(struct netif *netif)
-{
-  struct k64f_enetdata *k64f_enet = netif->state;
-  s32_t fb;
-  u32_t idx, cidx;
-
-  cidx = k64f_enet->tx_consume_index;
-  idx = k64f_enet->tx_produce_index;
-
-  /* Determine number of free buffers */
-  if (idx == cidx)
-    fb = ENET_TX_RING_LEN;
-  else if (cidx > idx)
-    fb = (ENET_TX_RING_LEN - 1) -
-      ((idx + ENET_TX_RING_LEN) - cidx);
-  else
-    fb = (ENET_TX_RING_LEN - 1) - (cidx - idx);
-
-  return fb;
-}
-
-/*FUNCTION****************************************************************
- *
- * Function Name: enet_hal_update_txbds
- * Description: Update ENET transmit buffer descriptors.
- *END*********************************************************************/
-void k64f_update_txbds(struct k64f_enetdata *k64f_enet, int idx, uint8_t *buffer, uint16_t length, bool isLast)
-{
-  volatile enet_bd_struct_t * bdPtr = (enet_bd_struct_t *)(k64f_enet->tx_desc_start_addr + idx * enet_hal_get_bd_size());
-    
-  bdPtr->length = HTONS(length); /* Set data length*/
-  bdPtr->buffer = (uint8_t *)HTONL((uint32_t)buffer); /* Set data buffer*/
-  if (isLast)
-    bdPtr->control |= kEnetTxBdLast;
-  else
-    bdPtr->control &= ~kEnetTxBdLast;
-  bdPtr->controlExtend1 |= kEnetTxBdTxInterrupt;
-  bdPtr->controlExtend2 &= ~TX_DESC_UPDATED_MASK; // descriptor not updated by DMA
-  bdPtr->control |= kEnetTxBdTransmitCrc | kEnetTxBdReady;
-}
-
-/** \brief  Low level output of a packet. Never call this from an
- *          interrupt context, as it may block until TX descriptors
- *          become available.
- *
- *  \param[in] netif the lwip network interface structure for this netif
- *  \param[in] p the MAC packet to send (e.g. IP packet including MAC addresses and type)
- *  \return ERR_OK if the packet could be sent or an err_t value if the packet couldn't be sent
- */
-static err_t k64f_low_level_output(struct netif *netif, struct pbuf *p)
-{
-  struct k64f_enetdata *k64f_enet = netif->state;
-  struct pbuf *q;
-  u32_t idx;
-  s32_t dn;
-  uint8_t *psend = NULL, *dst;
-
-  /* Get free TX buffer index */
-  idx = k64f_enet->tx_produce_index;
-  
-  /* Check the pbuf chain for payloads that are not 8-byte aligned.
-     If found, a new properly aligned buffer needs to be allocated
-     and the data copied there */
-  for (q = p; q != NULL; q = q->next)
-    if (((u32_t)q->payload & (TX_BUF_ALIGNMENT - 1)) != 0)
-      break;
-  if (q != NULL) {
-    // Allocate properly aligned buffer
-    psend = (uint8_t*)malloc(p->tot_len);
-    if (NULL == psend)
-      return ERR_MEM;   
-    LWIP_ASSERT("k64f_low_level_output: buffer not properly aligned", ((u32_t)psend & (TX_BUF_ALIGNMENT - 1)) == 0);
-    for (q = p, dst = psend; q != NULL; q = q->next) {
-      MEMCPY(dst, q->payload, q->len);
-      dst += q->len;
-    }
-    k64f_enet->txb_aligned[idx] = psend;
-    dn = 1;
-  } else {
-    k64f_enet->txb_aligned[idx] = NULL;
-    dn = (s32_t) pbuf_clen(p);
-    pbuf_ref(p);
-  }
-
-  /* Wait until enough descriptors are available for the transfer. */
-  /* THIS WILL BLOCK UNTIL THERE ARE ENOUGH DESCRIPTORS AVAILABLE */
-  while (dn > k64f_tx_ready(netif))
-    osSemaphoreWait(k64f_enet->xTXDCountSem.id, osWaitForever);
-
-  /* Get exclusive access */
-  sys_mutex_lock(&k64f_enet->TXLockMutex);
-
-  /* Setup transfers */
-  q = p;
-  while (dn > 0) {
-    dn--;
-    if (psend != NULL) {
-      k64f_update_txbds(k64f_enet, idx, psend, p->tot_len, 1);
-      k64f_enet->txb[idx] = NULL;
-      
-      LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-      ("k64f_low_level_output: aligned packet(%p) sent"
-      " size = %d (index=%d)\n", psend, p->tot_len, idx));      
-    } else {
-      LWIP_ASSERT("k64f_low_level_output: buffer not properly aligned", ((u32_t)q->payload & 0x07) == 0);
-
-      /* Only save pointer to free on last descriptor */
-      if (dn == 0) {
-        /* Save size of packet and signal it's ready */
-        k64f_update_txbds(k64f_enet, idx, q->payload, q->len, 1);
-        k64f_enet->txb[idx] = p;
-      }
-      else {
-        /* Save size of packet, descriptor is not last */
-        k64f_update_txbds(k64f_enet, idx, q->payload, q->len, 0);
-        k64f_enet->txb[idx] = NULL;
-      }
-      
-      LWIP_DEBUGF(UDP_LPC_EMAC | LWIP_DBG_TRACE,
-      ("k64f_low_level_output: pbuf packet(%p) sent, chain#=%d,"
-      " size = %d (index=%d)\n", q->payload, dn, q->len, idx));
-    }
-
-    q = q->next;
-
-    idx = (idx + 1) % ENET_TX_RING_LEN;
-  }
-
-  k64f_enet->tx_produce_index = idx;
-  enet_hal_active_txbd(BOARD_DEBUG_ENET_INSTANCE);
-  LINK_STATS_INC(link.xmit);
-
-  /* Restore access */
-  sys_mutex_unlock(&k64f_enet->TXLockMutex);
-
-  return ERR_OK;
-}
-
-/*******************************************************************************
- * PHY task: monitor link
-*******************************************************************************/
-
-#define PHY_TASK_PERIOD_MS      200
-#define STATE_UNKNOWN           (-1)
-
-typedef struct {
-    int connected;
-    enet_phy_speed_t speed;
-    enet_phy_duplex_t duplex;
-} PHY_STATE;
-
-static void k64f_phy_task(void *data) {
-  struct netif *netif = (struct netif*)data;
-  bool connection_status;
-  enet_dev_if_t * enetIfPtr = (enet_dev_if_t*)&enetDevIf[BOARD_DEBUG_ENET_INSTANCE];
-  PHY_STATE crt_state = {STATE_UNKNOWN, (enet_phy_speed_t)STATE_UNKNOWN, (enet_phy_duplex_t)STATE_UNKNOWN};
-  PHY_STATE prev_state;
-
-  prev_state = crt_state;
-  while (true) {
-    // Get current status
-    phy_get_link_status(enetIfPtr, &connection_status);
-    crt_state.connected = connection_status ? 1 : 0;
-    phy_get_link_speed(enetIfPtr, &crt_state.speed);
-    phy_get_link_duplex(enetIfPtr, &crt_state.duplex);
-
-    // Compare with previous state
-    if (crt_state.connected != prev_state.connected) {
-      if (crt_state.connected)
-        tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_up, (void*) netif, 1);
-      else
-        tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_down, (void*) netif, 1);
-    }
-
-    if (crt_state.speed != prev_state.speed)
-      BW_ENET_RCR_RMII_10T(enetIfPtr->deviceNumber, crt_state.speed == kEnetSpeed10M ? kEnetCfgSpeed10M : kEnetCfgSpeed100M);
-
-    // TODO: duplex change requires disable/enable of Ethernet interface, to be implemented
-
-    prev_state = crt_state;
-    osDelay(PHY_TASK_PERIOD_MS);
-  }
-}
-
-/**
- * Should be called at the beginning of the program to set up the
- * network interface.
- *
- * This function should be passed as a parameter to netif_add().
- *
- * @param[in] netif the lwip network interface structure for this netif
- * @return ERR_OK if the loopif is initialized
- *         ERR_MEM if private data couldn't be allocated
- *         any other err_t on error
- */
-err_t eth_arch_enetif_init(struct netif *netif)
-{
-  err_t err;
-
-  LWIP_ASSERT("netif != NULL", (netif != NULL));
-
-  k64f_enetdata.netif = netif;
-
-  /* set MAC hardware address */
-#if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
-  netif->hwaddr[0] = MBED_MAC_ADDR_0;
-  netif->hwaddr[1] = MBED_MAC_ADDR_1;
-  netif->hwaddr[2] = MBED_MAC_ADDR_2;
-  netif->hwaddr[3] = MBED_MAC_ADDR_3;
-  netif->hwaddr[4] = MBED_MAC_ADDR_4;
-  netif->hwaddr[5] = MBED_MAC_ADDR_5;
-#else
-  mbed_mac_address((char *)netif->hwaddr);
-#endif
-  netif->hwaddr_len = ETHARP_HWADDR_LEN;
-
-  /* maximum transfer unit */
-  netif->mtu = 1500;
-
-  /* device capabilities */
-  // TODOETH: check if the flags are correct below
-  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
-
-  /* Initialize the hardware */
-  netif->state = &k64f_enetdata;
-  err = low_level_init(netif);
-  if (err != ERR_OK)
-    return err;
-
-#if LWIP_NETIF_HOSTNAME
-  /* Initialize interface hostname */
-  netif->hostname = "lwipk64f";
-#endif /* LWIP_NETIF_HOSTNAME */
-
-  netif->name[0] = 'e';
-  netif->name[1] = 'n';
-
-  netif->output = k64f_etharp_output;
-  netif->linkoutput = k64f_low_level_output;
-
-  /* CMSIS-RTOS, start tasks */
-#ifdef CMSIS_OS_RTX
-  memset(k64f_enetdata.xTXDCountSem.data, 0, sizeof(k64f_enetdata.xTXDCountSem.data));
-  k64f_enetdata.xTXDCountSem.def.semaphore = k64f_enetdata.xTXDCountSem.data;
-#endif
-  k64f_enetdata.xTXDCountSem.id = osSemaphoreCreate(&k64f_enetdata.xTXDCountSem.def, ENET_TX_RING_LEN);
-
-  LWIP_ASSERT("xTXDCountSem creation error", (k64f_enetdata.xTXDCountSem.id != NULL));
-
-  err = sys_mutex_new(&k64f_enetdata.TXLockMutex);
-  LWIP_ASSERT("TXLockMutex creation error", (err == ERR_OK));
-
-  /* Packet receive task */
-  err = sys_sem_new(&k64f_enetdata.RxReadySem, 0);
-  LWIP_ASSERT("RxReadySem creation error", (err == ERR_OK));
-  sys_thread_new("receive_thread", packet_rx, netif->state, DEFAULT_THREAD_STACKSIZE, RX_PRIORITY);
-
-  /* Transmit cleanup task */
-  err = sys_sem_new(&k64f_enetdata.TxCleanSem, 0);
-  LWIP_ASSERT("TxCleanSem creation error", (err == ERR_OK));
-  sys_thread_new("txclean_thread", packet_tx, netif->state, DEFAULT_THREAD_STACKSIZE, TX_PRIORITY);
-
-  /* PHY monitoring task */
-  sys_thread_new("phy_thread", k64f_phy_task, netif, DEFAULT_THREAD_STACKSIZE, PHY_PRIORITY);
-
-  /* Allow the PHY task to detect the initial link state and set up the proper flags */
-  osDelay(10);
-
-  return ERR_OK;
-}
-
-void eth_arch_enable_interrupts(void) {
-  enet_hal_config_interrupt(BOARD_DEBUG_ENET_INSTANCE, (kEnetTxFrameInterrupt | kEnetRxFrameInterrupt), true);  
-  interrupt_enable(enet_irq_ids[BOARD_DEBUG_ENET_INSTANCE][enetIntMap[kEnetRxfInt]]);
-  interrupt_enable(enet_irq_ids[BOARD_DEBUG_ENET_INSTANCE][enetIntMap[kEnetTxfInt]]); 
-}
-
-void eth_arch_disable_interrupts(void) {
-  interrupt_disable(enet_irq_ids[BOARD_DEBUG_ENET_INSTANCE][enetIntMap[kEnetRxfInt]]);
-  interrupt_disable(enet_irq_ids[BOARD_DEBUG_ENET_INSTANCE][enetIntMap[kEnetTxfInt]]);  
-}
-
-void ENET_Transmit_IRQHandler(void)
-{
-     enet_mac_tx_isr(enetIfHandle);
-}
-
-void ENET_Receive_IRQHandler(void)
-{
-     enet_mac_rx_isr(enetIfHandle);
-}
-
-#if FSL_FEATURE_ENET_SUPPORT_PTP
-void ENET_1588_Timer_IRQHandler(void)
-{
-     enet_mac_ts_isr(enetIfHandle);
-}
-#endif
-/**
- * @}
- */
-
-/* --------------------------------- End Of File ------------------------------ */
-