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/*

 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

 * OF SUCH DAMAGE.

 *

 * This file is part of the lwIP TCP/IP stack.

 *

 * Author: Adam Dunkels <adam@sics.se>

 *

 */

/*

 * This file is a skeleton for developing Ethernet network interface

 * drivers for lwIP. Add code to the low_level functions and do a

 * search-and-replace for the word "ethernetif" to replace it with

 * something that better describes your network interface.

 */

#include "lwip/opt.h"

#include "lwip/def.h"

#include "lwip/mem.h"

#include "lwip/pbuf.h"

#include "lwip/sys.h"

#include <lwip/stats.h>

#include "netif/etharp.h"

#include "91x_enet.h"

// Standard library include

#include <string.h>

#define netifMTU                                ( 1500 )

#define netifINTERFACE_TASK_STACK_SIZE          ( 350 )

#define netifINTERFACE_TASK_PRIORITY            ( configMAX_PRIORITIES - 1 )

#define netifGUARD_BLOCK_TIME                   ( 250 )

#define IFNAME0 'e'

#define IFNAME1 'm'

/* The time to block waiting for input. */

#define emacBLOCK_TIME_WAITING_FOR_INPUT        ( ( portTickType ) 100 )

/* Interrupt status bit definition. */

#define DMI_RX_CURRENT_DONE 0x8000

extern u8 TxBuff[1520];

static u8_t s_rxBuff[1520];

/* The semaphore used by the ISR to wake the lwIP task. */

static xSemaphoreHandle s_xSemaphore = NULL;

struct ethernetif {

  struct eth_addr *ethaddr;

  /* Add whatever per-interface state that is needed here. */

};

static struct netif *s_pxNetIf = NULL;

/* Forward declarations. */

static err_t ethernetif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr);

static void ethernetif_input( void * pvParameters );

static void vEMACWaitForInput( void );

static void low_level_init(struct netif *netif)

{

  /* set MAC hardware address length */

  netif->hwaddr_len = 6;

  /* set MAC hardware address */

  netif->hwaddr[0] = MAC_ADDR0;

  netif->hwaddr[1] = MAC_ADDR1;

  netif->hwaddr[2] = MAC_ADDR2;

  netif->hwaddr[3] = MAC_ADDR3;

  netif->hwaddr[4] = MAC_ADDR4;

  netif->hwaddr[5] = MAC_ADDR5;

  /* maximum transfer unit */

  netif->mtu = netifMTU;

  /* broadcast capability */

  netif->flags = NETIF_FLAG_BROADCAST;

  s_pxNetIf = netif;

  if( s_xSemaphore == NULL )

  {

      vSemaphoreCreateBinary( s_xSemaphore );

      xSemaphoreTake( s_xSemaphore,  0);

  }

  /* Do whatever else is needed to initialize interface. */

  /* Initialise the MAC. */

  ENET_InitClocksGPIO();

  ENET_Init();

  ENET_Start();

  portENTER_CRITICAL();

  {

      /*set MAC physical*/

      ENET_MAC->MAH = (MAC_ADDR5<<8) + MAC_ADDR4;

      ENET_MAC->MAL = (MAC_ADDR3<<24) + (MAC_ADDR2<<16) + (MAC_ADDR1<<8) + MAC_ADDR0;

      VIC_Config( ENET_ITLine, VIC_IRQ, 1 );

      VIC_ITCmd( ENET_ITLine, ENABLE );

      ENET_DMA->ISR = DMI_RX_CURRENT_DONE;

      ENET_DMA->IER = DMI_RX_CURRENT_DONE;

  }

  portEXIT_CRITICAL();

  /* Create the task that handles the EMAC. */

  xTaskCreate( ethernetif_input, ( signed char * ) "ETH_INT", netifINTERFACE_TASK_STACK_SIZE, NULL, netifINTERFACE_TASK_PRIORITY, NULL );

}

/*

 * low_level_output():

 *

 * Should do the actual transmission of the packet. The packet is

 * contained in the pbuf that is passed to the function. This pbuf

 * might be chained.

 *

 */

static err_t low_level_output(struct netif *netif, struct pbuf *p)

{

  static xSemaphoreHandle xTxSemaphore = NULL;

  struct pbuf *q;

  u32_t l = 0;

  if( xTxSemaphore == NULL )

  {

      vSemaphoreCreateBinary( xTxSemaphore );

  }

#if ETH_PAD_SIZE

  pbuf_header(p, -ETH_PAD_SIZE);                        /* drop the padding word */

#endif

  /* Access to the EMAC is guarded using a semaphore. */

  if( xSemaphoreTake( xTxSemaphore, netifGUARD_BLOCK_TIME ) )

  {

      for(q = p; q != NULL; q = q->next) {

        /* Send the data from the pbuf to the interface, one pbuf at a

           time. The size of the data in each pbuf is kept in the ->len

           variable. */

        memcpy(&TxBuff[l], (u8_t*)q->payload, q->len);

        l += q->len;

      }

      ENET_TxPkt(0, l);

      #if ETH_PAD_SIZE

        pbuf_header(p, ETH_PAD_SIZE);                   /* reclaim the padding word */

      #endif

      #if LINK_STATS

        lwip_stats.link.xmit++;

      #endif /* LINK_STATS */

      xSemaphoreGive( xTxSemaphore );

  }

  return ERR_OK;

}

/*

 * low_level_input():

 *

 * Should allocate a pbuf and transfer the bytes of the incoming

 * packet from the interface into the pbuf.

 *

 */

static struct pbuf *

low_level_input(struct netif *netif)

{

  static xSemaphoreHandle xRxSemaphore = NULL;

  struct pbuf *p, *q;

  u16_t len, l;

  l = 0;

  p = NULL;

  if( xRxSemaphore == NULL )

  {

    vSemaphoreCreateBinary( xRxSemaphore );

  }

  /* Access to the emac is guarded using a semaphore. */

  if( xSemaphoreTake( xRxSemaphore, netifGUARD_BLOCK_TIME ) )

  {

        /* Obtain the size of the packet and put it into the "len"

           variable. */

        len = ENET_HandleRxPkt(s_rxBuff);

        if(len)

        {

              #if ETH_PAD_SIZE

                len += ETH_PAD_SIZE;                                            /* allow room for Ethernet padding */

              #endif

                /* We allocate a pbuf chain of pbufs from the pool. */

                p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);

                if (p != NULL) {

              #if ETH_PAD_SIZE

                  pbuf_header(p, -ETH_PAD_SIZE);                        /* drop the padding word */

              #endif

                  /* We iterate over the pbuf chain until we have read the entire

                   * packet into the pbuf. */

                  for(q = p; q != NULL; q = q->next) {

                    /* Read enough bytes to fill this pbuf in the chain. The

                     * available data in the pbuf is given by the q->len

                     * variable. */

                    memcpy((u8_t*)q->payload, &s_rxBuff[l], q->len);

                    l = l + q->len;

                  }

              #if ETH_PAD_SIZE

                  pbuf_header(p, ETH_PAD_SIZE);                 /* reclaim the padding word */

              #endif

              #if LINK_STATS

                  lwip_stats.link.recv++;

              #endif /* LINK_STATS */

                } else {

              #if LINK_STATS

                  lwip_stats.link.memerr++;

                  lwip_stats.link.drop++;

              #endif /* LINK_STATS */

                } /* End else */

        } /* End if */

       xSemaphoreGive( xRxSemaphore );

  }

  return p;

}

/*

 * ethernetif_output():

 *

 * This function is called by the TCP/IP stack when an IP packet

 * should be sent. It calls the function called low_level_output() to

 * do the actual transmission of the packet.

 *

 */

static err_t ethernetif_output(struct netif *netif, struct pbuf *p,  struct ip_addr *ipaddr)

{

 /* resolve hardware address, then send (or queue) packet */

  return etharp_output(netif, ipaddr, p);

}

/*

 * ethernetif_input():

 *

 * This function should be called when a packet is ready to be read

 * from the interface. It uses the function low_level_input() that

 * should handle the actual reception of bytes from the network

 * interface.

 *

 */

static void ethernetif_input( void * pvParameters )

{

  struct ethernetif *ethernetif;

  struct eth_hdr *ethhdr;

  struct pbuf *p;

        for( ;; )

        {

                do

                {

                        ethernetif = s_pxNetIf->state;

                        /* move received packet into a new pbuf */

                        p = low_level_input( s_pxNetIf );

                        if( p == NULL )

                        {

                                /* No packet could be read.  Wait a for an interrupt to tell us

                                there is more data available. */

                                vEMACWaitForInput();

                        }

                } while( p == NULL );

                /* points to packet payload, which starts with an Ethernet header */

                ethhdr = p->payload;

                #if LINK_STATS

                        lwip_stats.link.recv++;

                #endif /* LINK_STATS */

                ethhdr = p->payload;

                switch (htons(ethhdr->type))

                {

                        /* IP packet? */

                        case ETHTYPE_IP:

                                /* update ARP table */

                                etharp_ip_input(s_pxNetIf, p);

                                /* skip Ethernet header */

                                pbuf_header(p, (s16_t)-sizeof(struct eth_hdr));

                                /* pass to network layer */

                                s_pxNetIf->input(p, s_pxNetIf);

                                break;

                        case ETHTYPE_ARP:

                                  /* pass p to ARP module  */

                                  etharp_arp_input(s_pxNetIf, ethernetif->ethaddr, p);

                                  break;

                        default:

                                  pbuf_free(p);

                                  p = NULL;

                                  break;

                }

        }

}

static void

arp_timer(void *arg)

{

  etharp_tmr();

  sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);

}

/*

 * ethernetif_init():

 *

 * Should be called at the beginning of the program to set up the

 * network interface. It calls the function low_level_init() to do the

 * actual setup of the hardware.

 *

 */

err_t

ethernetif_init(struct netif *netif)

{

  struct ethernetif *ethernetif;

  ethernetif = mem_malloc(sizeof(struct ethernetif));

  if (ethernetif == NULL)

  {

        LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));

        return ERR_MEM;

  }

#if LWIP_SNMP

        /* ifType ethernetCsmacd(6) @see RFC1213 */

        netif->link_type = 6;

        /* your link speed here */

        netif->link_speed = ;

        netif->ts = 0;

        netif->ifinoctets = 0;

        netif->ifinucastpkts = 0;

        netif->ifinnucastpkts = 0;

        netif->ifindiscards = 0;

        netif->ifoutoctets = 0;

        netif->ifoutucastpkts = 0;

        netif->ifoutnucastpkts = 0;

        netif->ifoutdiscards = 0;

#endif

  netif->state = ethernetif;

  netif->name[0] = IFNAME0;

  netif->name[1] = IFNAME1;

  netif->output = ethernetif_output;

  netif->linkoutput = low_level_output;

  ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);

  low_level_init(netif);

  etharp_init();

  sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);

  return ERR_OK;

}

/*-----------------------------------------------------------*/

void ENET_IRQHandler(void)

{

portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

        /* Give the semaphore in case the lwIP task needs waking. */

        xSemaphoreGiveFromISR( s_xSemaphore, &xHigherPriorityTaskWoken );

        /* Clear the interrupt. */

        ENET_DMA->ISR = DMI_RX_CURRENT_DONE;

        /* Switch tasks if necessary. */

        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );

}

/*-----------------------------------------------------------*/

void vEMACWaitForInput( void )

{

        /* Just wait until we are signled from an ISR that data is available, or

        we simply time out. */

        xSemaphoreTake( s_xSemaphore, emacBLOCK_TIME_WAITING_FOR_INPUT );

}