if_ne.c

早期freebsd实现

/*-
 * Copyright (c) 1990, 1991 William F. Jolitz.
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)if_ne.c	8.1 (Berkeley) 6/11/93
 */

/*
 * NE2000 Ethernet driver
 *
 * Parts inspired from Tim Tucker's if_wd driver for the wd8003,
 * insight on the ne2000 gained from Robert Clements PC/FTP driver.
 */

#include "ne.h"
#if NNE > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#include <i386/isa/isa_device.h>
#include <i386/isa/if_nereg.h>
#include <i386/isa/icu.h>

int	neprobe(), neattach(), neintr();
int	nestart(),neinit(), ether_output(), neioctl();

struct	isa_driver nedriver = {
	neprobe, neattach, "ne",
};

struct	mbuf *neget();

#define ETHER_MIN_LEN 64
#define ETHER_MAX_LEN 1536

/*
 * Ethernet software status per interface.
 *
 * Each interface is referenced by a network interface structure,
 * ns_if, which the routing code uses to locate the interface.
 * This structure contains the output queue for the interface, its address, ...
 */
struct	ne_softc {
	struct	arpcom ns_ac;		/* Ethernet common part */
#define	ns_if	ns_ac.ac_if		/* network-visible interface */
#define	ns_addr	ns_ac.ac_enaddr		/* hardware Ethernet address */
	int	ns_flags;
#define	DSF_LOCK	1		/* block re-entering enstart */
	int	ns_oactive ;
	int	ns_mask ;
	int	ns_ba;			/* byte addr in buffer ram of inc pkt */
	int	ns_cur;			/* current page being filled */
	struct	prhdr	ns_ph;		/* hardware header of incoming packet*/
	struct	ether_header ns_eh;	/* header of incoming packet */
	u_char	ns_pb[2048 /*ETHERMTU+sizeof(long)*/];
} ne_softc[NNE] ;
#define	ENBUFSIZE	(sizeof(struct ether_header) + ETHERMTU + 2 + ETHER_MIN_LEN)

int nec;

u_short boarddata[16];
 
neprobe(dvp)
	struct isa_device *dvp;
{
	int val,i,s;
	register struct ne_softc *ns = &ne_softc[0];

#ifdef lint
	neintr(0);
#endif

	nec = dvp->id_iobase;
	s = splimp();

	/* Reset the bastard */
	val = inb(nec+ne_reset);
	DELAY(2000000);
	outb(nec+ne_reset,val);

	outb(nec+ds_cmd, DSCM_STOP|DSCM_NODMA);
	
	i = 1000000;
	while ((inb(nec+ds0_isr)&DSIS_RESET) == 0 && i-- > 0);
	if (i < 0) return (0);

	outb(nec+ds0_isr, 0xff);

	/* Word Transfers, Burst Mode Select, Fifo at 8 bytes */
	outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1);

	outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP);
	DELAY(10000);

	/* Check cmd reg and fail if not right */
	if ((i=inb(nec+ds_cmd)) != (DSCM_NODMA|DSCM_PG0|DSCM_STOP))
		return(0);

	outb(nec+ds0_tcr, 0);
	outb(nec+ds0_rcr, DSRC_MON);
	outb(nec+ds0_pstart, RBUF/DS_PGSIZE);
	outb(nec+ds0_pstop, RBUFEND/DS_PGSIZE);
	outb(nec+ds0_bnry, RBUFEND/DS_PGSIZE);
	outb(nec+ds0_imr, 0);
	outb(nec+ds0_isr, 0);
	outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP);
	outb(nec+ds1_curr, RBUF/DS_PGSIZE);
	outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP);

#ifdef NEDEBUG
#define	PAT(n)	(0xa55a + 37*(n))
#define	RCON	37
	{	int i, rom, pat;

		rom=1;
		printf("ne ram ");
		
		for (i = 0; i < 0xfff0; i+=4) {
			pat = PAT(i);
			neput(&pat,i,4);
			nefetch(&pat,i,4);
			if (pat == PAT(i)) {
				if (rom) {
					rom=0;
					printf(" %x", i);
				}
			} else {
				if (!rom) {
					rom=1;
					printf("..%x ", i);
				}
			}
			pat=0;
			neput(&pat,i,4);
		}
		printf("\n");
	}
#endif

	/* Extract board address */
	nefetch ((caddr_t)boarddata, 0, sizeof(boarddata));
	for(i=0; i < 6; i++)  ns->ns_addr[i] = boarddata[i];
	splx(s);
	return (1);
}

/*
 * Fetch from onboard ROM/RAM
 */
nefetch (up, ad, len) caddr_t up; {
	u_char cmd;

	cmd = inb(nec+ds_cmd);
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START);

	/* Setup remote dma */
	outb (nec+ds0_isr, DSIS_RDC);
	outb (nec+ds0_rbcr0, len);
	outb (nec+ds0_rbcr1, len>>8);
	outb (nec+ds0_rsar0, ad);
	outb (nec+ds0_rsar1, ad>>8);

	/* Execute & extract from card */
	outb (nec+ds_cmd, DSCM_RREAD|DSCM_PG0|DSCM_START);
	insw (nec+ne_data, up, len/2);

	/* Wait till done, then shutdown feature */
	while ((inb (nec+ds0_isr) & DSIS_RDC) == 0) ;
	outb (nec+ds0_isr, DSIS_RDC);
	outb (nec+ds_cmd, cmd);
}

/*
 * Put to onboard RAM
 */
neput (up, ad, len) caddr_t up; {
	u_char cmd;

	cmd = inb(nec+ds_cmd);
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START);

	/* Setup for remote dma */
	outb (nec+ds0_isr, DSIS_RDC);
	if(len&1) len++;		/* roundup to words */
	outb (nec+ds0_rbcr0, len);
	outb (nec+ds0_rbcr1, len>>8);
	outb (nec+ds0_rsar0, ad);
	outb (nec+ds0_rsar1, ad>>8);

	/* Execute & stuff to card */
	outb (nec+ds_cmd, DSCM_RWRITE|DSCM_PG0|DSCM_START);
	outsw (nec+ne_data, up, len/2);
	
	/* Wait till done, then shutdown feature */
	while ((inb (nec+ds0_isr) & DSIS_RDC) == 0) ;
	outb (nec+ds0_isr, DSIS_RDC);
	outb (nec+ds_cmd, cmd);
}

/*
 * Reset of interface.
 */
nereset(unit, uban)
	int unit, uban;
{
	if (unit >= NNE)
		return;
	printf("ne%d: reset\n", unit);
	ne_softc[unit].ns_flags &= ~DSF_LOCK;
	neinit(unit);
}
 
/*
 * Interface exists: make available by filling in network interface
 * record.  System will initialize the interface when it is ready
 * to accept packets.  We get the ethernet address here.
 */
neattach(dvp)
	struct isa_device *dvp;
{
	int unit = dvp->id_unit;
	register struct ne_softc *ns = &ne_softc[unit];
	register struct ifnet *ifp = &ns->ns_if;

	ifp->if_unit = unit;
	ifp->if_name = nedriver.name ;
	ifp->if_mtu = ETHERMTU;
	printf (" ethernet address %s", ether_sprintf(ns->ns_addr)) ;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
	ifp->if_init = neinit;
	ifp->if_output = ether_output;
	ifp->if_start = nestart;
	ifp->if_ioctl = neioctl;
	ifp->if_reset = nereset;
	ifp->if_watchdog = 0;
	if_attach(ifp);
}

/*
 * Initialization of interface; set up initialization block
 * and transmit/receive descriptor rings.
 */
neinit(unit)
	int unit;
{
	register struct ne_softc *ns = &ne_softc[unit];
	struct ifnet *ifp = &ns->ns_if;
	int s;
	register i; char *cp;

 	if (ifp->if_addrlist == (struct ifaddr *)0) return;
	if (ifp->if_flags & IFF_RUNNING) return;

	s = splimp();

	/* set physical address on ethernet */
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP);
	for (i=0 ; i < 6 ; i++) outb(nec+ds1_par0+i,ns->ns_addr[i]);

	/* clr logical address hash filter for now */
	for (i=0 ; i < 8 ; i++) outb(nec+ds1_mar0+i,0xff);

	/* init regs */
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP);
	outb (nec+ds0_rbcr0, 0);
	outb (nec+ds0_rbcr1, 0);
	outb (nec+ds0_imr, 0);
	outb (nec+ds0_isr, 0xff);

	/* Word Transfers, Burst Mode Select, Fifo at 8 bytes */
	outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1);
	outb(nec+ds0_tcr, 0);
	outb (nec+ds0_rcr, DSRC_MON);
	outb (nec+ds0_tpsr, 0);
	outb(nec+ds0_pstart, RBUF/DS_PGSIZE);
	outb(nec+ds0_pstop, RBUFEND/DS_PGSIZE);
	outb(nec+ds0_bnry, RBUF/DS_PGSIZE);
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP);
	outb(nec+ds1_curr, RBUF/DS_PGSIZE);
	ns->ns_cur = RBUF/DS_PGSIZE;
	outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START);
	outb (nec+ds0_rcr, DSRC_AB);
	outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1);
	outb (nec+ds0_imr, 0xff);

	ns->ns_if.if_flags |= IFF_RUNNING;
	ns->ns_oactive = 0; ns->ns_mask = ~0;
	nestart(ifp);
	splx(s);
}

/*
 * Setup output on interface.
 * Get another datagram to send off of the interface queue,
 * and map it to the interface before starting the output.
 * called only at splimp or interrupt level.
 */
nestart(ifp)
	struct ifnet *ifp;
{
	register struct ne_softc *ns = &ne_softc[ifp->if_unit];
	struct mbuf *m0, *m;
	int buffer;
	int len = 0, i, total,t;

	/*
	 * The DS8390 has only one transmit buffer, if it is busy we
	 * must wait until the transmit interrupt completes.
	 */
	outb(nec+ds_cmd,DSCM_NODMA|DSCM_START);

	if (ns->ns_flags & DSF_LOCK)
		return;

	if (inb(nec+ds_cmd) & DSCM_TRANS)
		return;

	if ((ns->ns_if.if_flags & IFF_RUNNING) == 0)
		return;

	IF_DEQUEUE(&ns->ns_if.if_snd, m);
 
	if (m == 0)
		return;

	/*
	 * Copy the mbuf chain into the transmit buffer
	 */

	ns->ns_flags |= DSF_LOCK;	/* prevent entering nestart */
	buffer = TBUF; len = i = 0;
	t = 0;
	for (m0 = m; m != 0; m = m->m_next)
		t += m->m_len;
		
	m = m0;
	total = t;
	for (m0 = m; m != 0; ) {
		
		if (m->m_len&1 && t > m->m_len) {
			neput(mtod(m, caddr_t), buffer, m->m_len - 1);
			t -= m->m_len - 1;
			buffer += m->m_len - 1;
			m->m_data += m->m_len - 1;
			m->m_len = 1;