netinit.c

这是TFTP 协议的最新源代码 很辛苦的

/*
	Copyright 2001-2004 Georges Menie (www.menie.org)

	This file is part of Tftpnaive.

    Tftpnaive is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Tftpnaive is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Tftpnaive; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "tftpnaive.h"
#include "68vz328.h"
#include "io.h"
#include "net.h"
#include "timer.h"
#include "proto.h"
#include "cs89x.h"

int netUp (void)
{
	int error;

	memcpy (netif.IEEEIA, (void *) 0x400fffa, sizeof netif.IEEEIA);
	netif.send = cs89xSend;

	/* disable IRQ */
	orl (1 << IRQ_NUM, IMR);

	/* initialise the CSB0 to be used as FPGA/CS89 Chip Select */
	writew (0x08000000 >> 13, CSGBB);
	writew (0x01A1, CSB);		/* read/write, 128k, 4ws, FLASH enable, 16 bits bus */

	/* PK3: hardware sleep function pin, active low */
	orb (0x08, PKSEL);			// select pin as I/O
	orb (0x08, PKDIR);			// select pin as output
	orb (0x08, PKDATA);			// set pin high

	/* PF5: hardware reset function pin, active high */
	orb (0x20, PFSEL);			// select pin as I/O
	orb (0x20, PFDIR);			// select pin as output
	andb (~0x20, PFDATA);		// set pin low

	error = cs89xReset ();
	if (error) return error;

	/* set interrupt service routine: INT1 -> level 4 */
	writel ((int) cs89xISR, ((readb (IVR) & 0xf8) + 4) << 2);

	/* INT1 enable (cs8900 IRQ) */
	andb (~2, PDPOL);			/* active high signal */
	andb (~2, PDIRQEG);			/* level-triggered */
	orb (2, PDIRQEN);			/* IRQ enabled */

	/* network chip initialization
	 * if there is a error the function returns to the caller.
	 */
	error = cs89xSetup ();
	if (error) return error;

	/* enable IRQ */
	orl (1 << IRQ_NUM, ISR);
	andl (~(1 << IRQ_NUM), IMR);

	return 0;
}

int netDown (void)
{
	/* INT1 disable (cs8900 IRQ) */
	andb (~2, PDIRQEN);

	/* disable IRQ */
	orl (1 << IRQ_NUM, IMR);
	orl (1 << IRQ_NUM, ISR);

	return cs89xReset ();
}