sed_ar7.c

ADAM2 sources (modified by Oleg)

/*-----------------------------------------------------------------------------*/
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/*  c/o ADAM2 Application Manager                                              */
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/*-----------------------------------------------------------------------------*/
/* 																			   */
/* Ethernet Driver. 														   */
/* A Very Simple set of ethernet driver primitives.  The ethernet (3com Mbus)  */
/* interface is controlled by busy-waiting, the application is handed the      */
/* location of on-board packet buffers, and allowed to fill in the             */
/* transmit buffer directly.  The interface is entirely blocking.              */
/*  																		   */
/* Written March, 1986 by Geoffrey Cooper 									   */
/* 																			   */
/* Copyright (C) 1986, IMAGEN Corporation 									   */
/*  "This code may be duplicated in whole or in part provided that [1] there   */
/*   is no commercial gain involved in the duplication, and [2] that this      */
/*   copyright notice is preserved on all copies.  Any other duplication       */
/*   requires written notice of the author."                                   */
/*  																		   */
/* Primitives: 																   */
/*  sed_Init()  -- Initialize the package 									   */
/*  sed_FormatPacket( destEAddr ) => location of transmit buffer               */
/*  sed_Send( pkLength ) -- send the packet that is in the transmit buffer     */ 
/*  sed_Receive( recBufLocation ) -- enable receiving packets.                 */
/*  sed_IsPacket() => location of packet in receive buffer                     */
/*  sed_CheckPacket( recBufLocation, expectedType )                            */
/*  sed_shutdown(); 														   */
/* 																			   */
/* Global Variables: 														   */
/*  sed_lclEthAddr -- Ethernet address of this host. 						   */
/*  sed_ethBcastAddr -- Ethernet broadcast address.                            */
/*-----------------------------------------------------------------------------*/

#include "_stdio.h"
#include "tinyip.h"
#include "emacphy.h"
#include "hw.h"
#include "env.h"
#include "support.h"
#include "errors.h"
#include "cpmac.h"

//#define  CPMAC_DEBUG	1

#define E10P_MIN        60              /* Minimum Ethernet packet size */

bit32u emacbase;

void sed_shutdown(void)
  {
	/* Do nothing, don't take the MAC out of reset */
	/*
	if(emacbase ==  EMACA_BASE)
	{
		RESET_PRCR  &= ~EMACA_RESET;
	}
	else
	{
  		RESET_PRCR  &= ~EMACB_RESET;
	}
	*/
	return;
  }

int sed_Init(int loopback)
  {
  int i;
  
  cpmac_init();
  for (i=0; i<3; i++) 
  	sed_ethBcastAddr[i] = 0xFFFF;
  return(0);
  }

/* 
 * Format an ethernet header in the transmit buffer, and say where it is.
 * Note that because of the way the 3Com interface works, we need to know
 * how long the packet is before we know where to put it.  The solution is
 * that we format the packet at the BEGINNING of the transmit buffer, and
 * later copy it (carefully) to where it belongs.  Another hack would be
 * to be inefficient about the size of the packet to be sent (always send
 * a larger ethernet packet than you need to, but copying should be ok for
 * now.
 */

char abuffer[4096];

octet *
sed_FormatPacket( destEAddr, ethType )
        register octet *destEAddr;
  {
  octet *xMitBuf;
  bit32u *dp;
  int i;
    
  for(i=0,dp=(bit32u *)abuffer;i<((sizeof abuffer)/4);i++) 
    *dp++=0;

  xMitBuf = (octet *)&abuffer[2];
  Move( destEAddr, xMitBuf, 6 );
  Move( sed_lclEthAddr, xMitBuf + 6, 6 );
  *((short *)(xMitBuf+12)) = wfix(ethType);
  return(xMitBuf+14);
  }

/*
 *  Send a packet out over the ethernet.  The packet is sitting at the
 * beginning of the transmit buffer.  The routine returns when the
 * packet has been successfully sent.
 */
int sed_Send( pkLengthInOctets )
  register int pkLengthInOctets;
  {
  char *cp;

  pkLengthInOctets += 14;             /* account for Ethernet header */
  pkLengthInOctets = (pkLengthInOctets + 1) & (~1);

  if (pkLengthInOctets < E10P_MIN) 
    pkLengthInOctets = E10P_MIN; /* and min. ethernet len */

  cp=&abuffer[2];
  cpmac_tx((char *)UNCACHED(cp),pkLengthInOctets);
  return(0);
  }

/* 
 * Test for the arrival of a packet on the Ethernet interface.  The packet may
 * arrive in either buffer A or buffer B; the location of the packet is
 * returned.  If no packet is returned withing 'timeout' milliseconds,
 * then the routine returns zero.
 * 
 * Note: ignores ethernet errors.  may occasionally return something
 * which was received in error.
 */

octet *sed_IsPacket(void)
  {
  octet *pb;
    
  int len;
  Status ret;
  volatile unsigned int  poll_itv = 60000;

#ifdef CPMAC_DEBUG
  sys_printf("WAITING FOR INCOMING PACKET...\n");
#endif

  do {
  	ret = cpmac_rx((char **)&pb, &len);

	if (SBL_ELKDN == ret || SBL_EFAILURE == ret) {
	  sys_printf("\ncpmac rx failed or link is down.");
	  return NULL;
	}

	if (SBL_SUCCESS == ret)
	{
#ifdef CPMAC_DEBUG
	  sys_printf("rx success!!\n");
#endif
	  break;
	}

  } while (SBL_ETIMEOUT == ret && --poll_itv > 0);

  if(poll_itv ==  0)
  {
#ifdef CPMAC_DEBUG
	sys_printf("Rx timed out!!\n");	
	cpmac_stats(); 
#endif
  }
  if (pb)
    {
    pb+=14;
#ifdef CPMAC_DEBUG
  	sys_printf("GOT PACKET! Address: 0x%08x\n", pb);
#endif
    }
  return(pb);
  }

/* 
 *  Check to make sure that the packet that you received was the one that
 * you expected to get.
 */
int sed_CheckPacket( recBufLocation, expectedType )
    word *recBufLocation;
    word expectedType;
  {

  if ( recBufLocation[-1] != wfix(expectedType) ) 
    return(0);
   else
    return(1);
  }

#include "cpmac.c"