if_ns.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

/* 
 * Copyright (c) 1994 Shantanu Goel
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 */

/*
 * Written 1992,1993 by Donald Becker.
 * 
 * Copyright 1993 United States Government as represented by the
 * Director, National Security Agency.	 This software may be used and
 * distributed according to the terms of the GNU Public License,
 * incorporated herein by reference.
 *
 * The Author may be reached as [e-mail] or
 * C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
 */

#include <ul.h>
#include <wd.h>
#include <hpp.h>
#if NUL > 0 || NWD > 0 || NHPP > 0
/*
 * Generic NS8390 routines.
 * Derived from the Linux driver by Donald Becker.
 *
 * Shantanu Goel ([e-mail])
 */
#include <sys/types.h>
#include <device/device_types.h>
#include <device/errno.h>
#include <device/io_req.h>
#include <device/if_hdr.h>
#include <device/if_ether.h>
#include <device/net_status.h>
#include <device/net_io.h>
#include <chips/busses.h>
#include <i386/machspl.h>
#include <i386/pio.h>
#include <i386at/gpl/if_nsreg.h>

#define IO_DELAY	__asm__ __volatile__ ("outb %al,$0x80")
#define outb_p(p, v)	{ outb(p, v); IO_DELAY; }
#define inb_p(p)	({ unsigned char _v; _v = inb(p); IO_DELAY; _v; })

#define NSDEBUG
#ifdef NSDEBUG
int	nsdebug = 0;
#define DEBUGF(stmt)	{ if (nsdebug) stmt; }
#else
#define DEBUGF(stmt)
#endif

void	nsxint(struct nssoftc *);
void	nsrint(struct nssoftc *);
void	nsxmit(struct nssoftc *, unsigned, int);
void	nsrxoverrun(struct nssoftc *);

/*
 * Initialize the NIC.
 * Must be called at splimp().
 */
void
nsinit(sc)
	struct nssoftc *sc;
{
	int port = sc->sc_port, i, rxconfig;
	int endcfg = sc->sc_word16 ? (0x48 | ENDCFG_WTS) : 0x48;
	struct ifnet *ifp = &sc->sc_if;

	/*
	 * Reset the board.
	 */
	(*sc->sc_reset)(sc);

	sc->sc_oactive = 0;
	sc->sc_txing = 0;
	sc->sc_timer = 0;
	sc->sc_tx1 = sc->sc_tx2 = 0;
	sc->sc_curpg = sc->sc_rxstrtpg;

	/*
	 * Follow National Semiconductor's recommendations for
	 * initializing the DP83902.
	 */
	outb_p(port, E8390_NODMA+E8390_PAGE0+E8390_STOP);	/* 0x21 */
	outb_p(port + EN0_DCFG, endcfg);	/* 0x48 or 0x49 */

	/*
	 * Clear remote byte count registers.
	 */
	outb_p(port + EN0_RCNTLO, 0);
	outb_p(port + EN0_RCNTHI, 0);

	/*
	 * Set to monitor and loopback mode -- this is vital!
	 */
	outb_p(port + EN0_RXCR, E8390_RXOFF);	/* 0x20 */
	outb_p(port + EN0_TXCR, E8390_TXOFF);	/* 0x02 */

	/*
	 * Set transmit page and receive ring.
	 */
	outb_p(port + EN0_TPSR, sc->sc_txstrtpg);
	outb_p(port + EN0_STARTPG, sc->sc_rxstrtpg);
	outb_p(port + EN0_BOUNDARY, sc->sc_stoppg - 1);
	outb_p(port + EN0_STOPPG, sc->sc_stoppg);

	/*
	 * Clear pending interrupts and mask.
	 */
	outb_p(port + EN0_ISR, 0xff);

	/*
         * Enable the following interrupts: receive/transmit complete,
         * receive/transmit error, and Receiver OverWrite.
         *
         * Counter overflow and Remote DMA complete are *not* enabled.
         */
	outb_p(port + EN0_IMR, ENISR_RX | ENISR_TX | ENISR_RX_ERR |
              ENISR_TX_ERR | ENISR_OVER );

	/*
	 * Copy station address into 8390 registers.
	 */
	outb_p(port, E8390_NODMA + E8390_PAGE1 + E8390_STOP);	/* 0x61 */
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		outb_p(port + EN1_PHYS + i, sc->sc_addr[i]);

	/*
	 * Set up to accept all multicast packets.
	 */
	for (i = 0; i < 8; i++)
		outb_p(port + EN1_MULT + i, 0xff);

	/*
	 * Initialize CURRent pointer
	 */
	outb_p(port + EN1_CURPAG, sc->sc_rxstrtpg);

	/*
	 * Program command register for page 0.
	 */
	outb_p(port, E8390_NODMA + E8390_PAGE0 + E8390_STOP);

#if 0
	outb_p(port + EN0_ISR, 0xff);
	outb_p(port + EN0_IMR, ENISR_ALL);
#endif

	outb_p(port + E8390_CMD, E8390_NODMA + E8390_PAGE0 + E8390_START);
	outb_p(port + EN0_TXCR, E8390_TXCONFIG);	/* xmit on */

	/* 3c503 TechMan says rxconfig only after the NIC is started. */
	rxconfig = E8390_RXCONFIG;
	if (ifp->if_flags & IFF_ALLMULTI)
		rxconfig |= 0x08;
	if (ifp->if_flags & IFF_PROMISC)
		rxconfig |= 0x10;
	outb_p(port + EN0_RXCR, rxconfig);	/* rx on */

	/*
	 * Mark interface as up and start output.
	 */
	ifp->if_flags |= IFF_RUNNING;
	nsstart(sc);
}

/*
 * Start output on interface.
 * Must be called at splimp().
 */
void
nsstart(sc)
	struct nssoftc *sc;
{
	io_req_t ior;
	struct ifnet *ifp = &sc->sc_if;

	/*
	 * Drop packets if interface is down.
	 */
	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
		while (1) {
			IF_DEQUEUE(&ifp->if_snd, ior);
			if (ior == 0)
				return;
			iodone(ior);
		}
	}
	/*
	 * If transmitter is busy, bail out.
	 */
	if (sc->sc_oactive)
		return;

	/*
	 * Dequeue a packet.
	 */
	IF_DEQUEUE(&ifp->if_snd, ior);
	if (ior == 0)
		return;

	/* Mask interrupts from the ethercard. */
    	outb( sc->sc_port + EN0_IMR, 0x00);

	if (sc->sc_pingpong) {
		int count, output_page;

		if (sc->sc_tx1 == 0) {
			output_page = sc->sc_txstrtpg;
			sc->sc_tx1 = count = (*sc->sc_output)(sc,
							      ior->io_count,
							      ior->io_data,
							      sc->sc_txstrtpg);
		} else if (sc->sc_tx2 == 0) {
			output_page = sc->sc_txstrtpg + 6;
			sc->sc_tx2 = count = (*sc->sc_output)(sc,
							      ior->io_count,
							      ior->io_data,
							      output_page);
		} else {
			sc->sc_oactive = 1;
			IF_PREPEND(&ifp->if_snd, ior);
			return;
		}

		DEBUGF({
			struct ether_header *eh;

			eh =  (struct ether_header *)ior->io_data;
			printf("send: %s%d: %x:%x:%x:%x:%x:%x, "
			       "olen %d, len %d\n",
			       sc->sc_name, sc->sc_unit,
			       eh->ether_dhost[0], eh->ether_dhost[1],
			       eh->ether_dhost[2], eh->ether_dhost[3],
			       eh->ether_dhost[4], eh->ether_dhost[5],
			       ior->io_count, count);
		});

		if (!sc->sc_txing) {
			nsxmit(sc, count, output_page);
			if (output_page == sc->sc_txstrtpg)
				sc->sc_tx1 = -1, sc->sc_lasttx = -1;
			else
				sc->sc_tx2 = -1, sc->sc_lasttx = -2;
		}
		sc->sc_oactive = (sc->sc_tx1 && sc->sc_tx2);
	} else {
		int count;

		count = (*sc->sc_output)(sc, ior->io_count,
					 ior->io_data, sc->sc_txstrtpg);

		DEBUGF({
			struct ether_header *eh;

			eh =  (struct ether_header *)ior->io_data;
			printf("send: %s%d: %x:%x:%x:%x:%x:%x, "
			       "olen %d, len %d\n",
			       sc->sc_name, sc->sc_unit,
			       eh->ether_dhost[0], eh->ether_dhost[1],
			       eh->ether_dhost[2], eh->ether_dhost[3],
			       eh->ether_dhost[4], eh->ether_dhost[5],
			       ior->io_count, count);
		});

		nsxmit(sc, count, sc->sc_txstrtpg);
		sc->sc_oactive = 1;
	}

	/* reenable 8390 interrupts. */	
	outb_p(sc->sc_port + EN0_IMR, ENISR_ALL);
	
	iodone(ior);
}

/*
 * Interrupt routine.
 * Called by board level driver.
 */
void
nsintr(sc)
	struct nssoftc *sc;
{
	int port = sc->sc_port;
	int interrupts, boguscount = 0;
	struct ifnet *ifp = &sc->sc_if;

	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
		DEBUGF(printf("nsintr: %s%d: interface down\n",
			      sc->sc_name, sc->sc_unit));
		return;
	}

	/*
	 * Change to page 0 and read intr status reg.
	 */
	outb_p(port + E8390_CMD, E8390_NODMA+E8390_PAGE0);

	while ((interrupts = inb_p(port + EN0_ISR)) != 0 && ++boguscount < 9) {
		if (interrupts & ENISR_RDC) {
			/*
			 * Ack meaningless DMA complete.
			 */
			outb_p(port + EN0_ISR, ENISR_RDC);
		}
		
		if (interrupts & ENISR_OVER) 
			nsrxoverrun(sc);
		else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) {
			nsrint(sc);
		}