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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/def.h"

#include "lwip/mem.h"

#include "lwip/pbuf.h"

#include "lwip/sys.h"

#include <lwip/stats.h>

#include <lwip/snmp.h>

#include "netif/etharp.h"

#include "91x_enet.h"

// Standard library include

#include <stdio.h>

#include <string.h>

#define netifMTU                                                                                                        ( 1500 )

#define netifINTERFACE_TASK_STACK_SIZE          ( 350 )

#define netifINTERFACE_TASK_PRIORITY                    ( configMAX_PRIORITIES - 1 )

#define netifBUFFER_WAIT_ATTEMPTS                                       10

#define netifBUFFER_WAIT_DELAY                                          (10 / portTICK_RATE_MS)

#define IFNAME0 'e'

#define IFNAME1 'n'

/* 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

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. */

};

/* Forward declarations. */

static void ethernetif_input( void *pParams );

u8 *pcGetNextBuffer( void );

/**

 * In this function, the hardware should be initialized.

 * Called from ethernetif_init().

 *

 * @param netif the already initialized lwip network interface structure

 *        for this ethernetif

 */

static void low_level_init(struct netif *netif)

{

  /* set MAC hardware address length */

  netif->hwaddr_len = ETHARP_HWADDR_LEN;

  /* 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;

  // device capabilities.

        // don't set NETIF_FLAG_ETHARP if this device is not an ethernet one

  netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;

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

  if( s_xSemaphore == NULL )

  {

      vSemaphoreCreateBinary( s_xSemaphore );

      xSemaphoreTake( s_xSemaphore,  0);

  }

  /* Initialise the MAC. */

  ENET_InitClocksGPIO();

  ENET_Init(PHY_AUTO_NEGOTIATION);

  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();

  netif->flags |= NETIF_FLAG_LINK_UP;

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

  xTaskCreate( ethernetif_input, ( signed portCHAR * ) "ETH_INT", netifINTERFACE_TASK_STACK_SIZE, (void *)netif, netifINTERFACE_TASK_PRIORITY, NULL );

}

/**

 * This function 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.

 *

 * @param netif the lwip network interface structure for this ethernetif

 * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)

 * @return ERR_OK if the packet could be sent

 *         an err_t value if the packet couldn't be sent

 *

 * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to

 *       strange results. You might consider waiting for space in the DMA queue

 *       to become availale since the stack doesn't retry to send a packet

 *       dropped because of memory failure (except for the TCP timers).

 */

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

{

  struct pbuf *q;

  u32_t l = 0;

        unsigned portCHAR *pcTxData;

#if ETH_PAD_SIZE

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

#endif

        /* Get a DMA buffer into which we can write the data to send. */

        for( int i = 0; i < netifBUFFER_WAIT_ATTEMPTS; i++ )

        {

                pcTxData = pcGetNextBuffer();

                if( pcTxData ){

                        break;

                } else {

                        vTaskDelay( netifBUFFER_WAIT_DELAY );

                }

        }

        if (pcTxData == NULL) {

                portNOP();

                return ERR_BUF;

        }

        else {

                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. */

                        vTaskSuspendAll();

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

                        xTaskResumeAll();

                        l += q->len;

                }

        }

        ENET_TxPkt( &pcTxData, l );

        #if ETH_PAD_SIZE

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

        #endif

                LINK_STATS_INC(link.xmit);

  return ERR_OK;

}

/**

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

 * packet from the interface into the pbuf.

 *

 * @param netif the lwip network interface structure for this ethernetif

 * @return a pbuf filled with the received packet (including MAC header)

 *         NULL on memory error

 */

static struct pbuf *low_level_input(struct netif *netif)

{

  struct pbuf *p, *q;

  u16_t len, l;

  l = 0;

  p = NULL;

        /* 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. */

                                vTaskSuspendAll();

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

                                xTaskResumeAll();

                                l = l + q->len;

                        }

        #if ETH_PAD_SIZE

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

        #endif

                        LINK_STATS_INC(link.recv);

                } else {

                        LINK_STATS_INC(link.memerr);

                        LINK_STATS_INC(link.drop);

                } /* End else */

        } /* End if */

  return p;

}

/**

 * 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.Then the type of the received packet is determined and

 * the appropriate input function is called.

 *

 * @param netif the lwip network interface structure for this ethernetif

 */

static void ethernetif_input( void *pParams )

{

        struct netif *netif;

  struct ethernetif *ethernetif;

  struct eth_hdr *ethhdr;

  struct pbuf *p;

        netif = (struct netif*) pParams;

        ethernetif = netif->state;

        for( ;; )

        {

                do

                {

                        /* move received packet into a new pbuf */

                        p = low_level_input( netif );

                        if( p == NULL )

                        {

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

                                there is more data available. */

                                xSemaphoreTake( s_xSemaphore, emacBLOCK_TIME_WAITING_FOR_INPUT );

                        }

                } while( p == NULL );

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

                ethhdr = p->payload;

                switch (htons(ethhdr->type)) {

                        /* IP or ARP packet? */

                case ETHTYPE_IP:

                        /* full packet send to tcpip_thread to process */

                        if (netif->input(p, netif) != ERR_OK)

                        {

                                LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));

                                pbuf_free(p);

                                p = NULL;

                        }

                        break;

                case ETHTYPE_ARP:

#if ETHARP_TRUST_IP_MAC

                        etharp_ip_input(netif, p);

#endif

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

                        break;

                default:

                        pbuf_free(p);

                        p = NULL;

                        break;

                }

        }

}

/**

 * 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.

 *

 * This function should be passed as a parameter to netif_add().

 *

 * @param netif the lwip network interface structure for this ethernetif

 * @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

ethernetif_init(struct netif *netif)

{

  struct ethernetif *ethernetif;

        LWIP_ASSERT("netif != NULL", (netif != NULL));

  ethernetif = mem_malloc(sizeof(struct ethernetif));

  if (ethernetif == NULL)

  {

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

        return ERR_MEM;

  }

#if LWIP_NETIF_HOSTNAME

  /* Initialize interface hostname */

  netif->hostname = "lwip";

#endif /* LWIP_NETIF_HOSTNAME */

  /*

         * Initialize the snmp variables and counters inside the struct netif.

         * The last argument should be replaced with your link speed, in units

         * of bits per second.

         */

        NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, 100);

  netif->state = ethernetif;

  netif->name[0] = IFNAME0;

  netif->name[1] = IFNAME1;

  /* We directly use etharp_output() here to save a function call.

         * You can instead declare your own function an call etharp_output()

         * from it if you have to do some checks before sending (e.g. if link

         * is available...)

         */

  netif->output = etharp_output;

  netif->linkoutput = low_level_output;

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

  low_level_init(netif);

  return ERR_OK;

}

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

void ENET_IRQHandler(void)

{

portBASE_TYPE xSwitchRequired;

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

        xSwitchRequired = xSemaphoreGiveFromISR( s_xSemaphore, &xSwitchRequired );

        /* Clear the interrupt. */

        ENET_DMA->ISR = DMI_RX_CURRENT_DONE;

        /* Switch tasks if necessary. */

        portEND_SWITCHING_ISR( xSwitchRequired );

}

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