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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 );
}
/*-----------------------------------------------------------*/