if_dmc.c

open bsd vax module -if function

/*
 * Copyright (c) 1982, 1986 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_dmc.c	7.10 (Berkeley) 12/16/90
 */

#include "dmc.h"
#if NDMC > 0

/*
 * DMC11 device driver, internet version
 *
 *	Bill Nesheim
 *	Cornell University
 *
 *	Lou Salkind
 *	New York University
 */

/* #define DEBUG	/* for base table dump on fatal error */

#include "../include/pte.h"

#include "sys/param.h"
#include "sys/systm.h"
#include "sys/mbuf.h"
#include "sys/buf.h"
#include "sys/ioctl.h"		/* must precede tty.h */
#include "sys/tty.h"
#include "sys/protosw.h"
#include "sys/socket.h"
#include "sys/syslog.h"
#include "sys/vmmac.h"
#include "sys/errno.h"
#include "sys/time.h"
#include "sys/kernel.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"
#endif

#include "../include/cpu.h"
#include "../include/mtpr.h"
#include "if_uba.h"
#include "if_dmc.h"
#include "../uba/ubareg.h"
#include "../uba/ubavar.h"


/*
 * output timeout value, sec.; should depend on line speed.
 */
int	dmc_timeout = 20;

/*
 * Driver information for auto-configuration stuff.
 */
int	dmcprobe(), dmcattach(), dmcinit(), dmcioctl();
int	dmcoutput(), dmcreset(), dmctimeout();
struct	uba_device *dmcinfo[NDMC];
u_short	dmcstd[] = { 0 };
struct	uba_driver dmcdriver =
	{ dmcprobe, 0, dmcattach, 0, dmcstd, "dmc", dmcinfo };

#define NRCV 7
#define NXMT 3 
#define NCMDS	(NRCV+NXMT+4)	/* size of command queue */

#define printd if(dmcdebug)printf
int dmcdebug = 0;

/* error reporting intervals */
#define DMC_RPNBFS	50
#define DMC_RPDSC	1
#define DMC_RPTMO	10
#define DMC_RPDCK	10

struct  dmc_command {
	char	qp_cmd;		/* command */
	short	qp_ubaddr;	/* buffer address */
	short	qp_cc;		/* character count || XMEM */
	struct	dmc_command *qp_next;	/* next command on queue */
};

struct dmcbufs {
	int	ubinfo;		/* from uballoc */
	short	cc;		/* buffer size */
	short	flags;		/* access control */
};
#define	DBUF_OURS	0	/* buffer is available */
#define	DBUF_DMCS	1	/* buffer claimed by somebody */
#define	DBUF_XMIT	4	/* transmit buffer */
#define	DBUF_RCV	8	/* receive buffer */


/*
 * DMC software status per interface.
 *
 * Each interface is referenced by a network interface structure,
 * sc_if, which the routing code uses to locate the interface.
 * This structure contains the output queue for the interface, its address, ...
 * We also have, for each interface, a  set of 7 UBA interface structures
 * for each, which
 * contain information about the UNIBUS resources held by the interface:
 * map registers, buffered data paths, etc.  Information is cached in this
 * structure for use by the if_uba.c routines in running the interface
 * efficiently.
 */
struct dmc_softc {
	struct	ifnet sc_if;		/* network-visible interface */
	short	sc_oused;		/* output buffers currently in use */
	short	sc_iused;		/* input buffers given to DMC */
	short	sc_flag;		/* flags */
	int	sc_ubinfo;		/* UBA mapping info for base table */
	int	sc_errors[4];		/* non-fatal error counters */
#define sc_datck sc_errors[0]
#define sc_timeo sc_errors[1]
#define sc_nobuf sc_errors[2]
#define sc_disc  sc_errors[3]
	struct	dmcbufs sc_rbufs[NRCV];	/* receive buffer info */
	struct	dmcbufs sc_xbufs[NXMT];	/* transmit buffer info */
	struct	ifubinfo sc_ifuba;	/* UNIBUS resources */
	struct	ifrw sc_ifr[NRCV];	/* UNIBUS receive buffer maps */
	struct	ifxmt sc_ifw[NXMT];	/* UNIBUS receive buffer maps */
	/* command queue stuff */
	struct	dmc_command sc_cmdbuf[NCMDS];
	struct	dmc_command *sc_qhead;	/* head of command queue */
	struct	dmc_command *sc_qtail;	/* tail of command queue */
	struct	dmc_command *sc_qactive;	/* command in progress */
	struct	dmc_command *sc_qfreeh;	/* head of list of free cmd buffers */
	struct	dmc_command *sc_qfreet;	/* tail of list of free cmd buffers */
	/* end command queue stuff */
} dmc_softc[NDMC];

/* flags */
#define DMC_RUNNING	0x01		/* device initialized */
#define DMC_BMAPPED	0x02		/* base table mapped */
#define DMC_RESTART	0x04		/* software restart in progress */
#define DMC_ONLINE	0x08		/* device running (had a RDYO) */

struct dmc_base {
	short	d_base[128];		/* DMC base table */
} dmc_base[NDMC];

/* queue manipulation macros */
#define	QUEUE_AT_HEAD(qp, head, tail) \
	(qp)->qp_next = (head); \
	(head) = (qp); \
	if ((tail) == (struct dmc_command *) 0) \
		(tail) = (head) 

#define QUEUE_AT_TAIL(qp, head, tail) \
	if ((tail)) \
		(tail)->qp_next = (qp); \
	else \
		(head) = (qp); \
	(qp)->qp_next = (struct dmc_command *) 0; \
	(tail) = (qp)

#define DEQUEUE(head, tail) \
	(head) = (head)->qp_next;\
	if ((head) == (struct dmc_command *) 0)\
		(tail) = (head)

dmcprobe(reg)
	caddr_t reg;
{
	register int br, cvec;
	register struct dmcdevice *addr = (struct dmcdevice *)reg;
	register int i;

#ifdef lint
	br = 0; cvec = br; br = cvec;
	dmcrint(0); dmcxint(0);
#endif
	addr->bsel1 = DMC_MCLR;
	for (i = 100000; i && (addr->bsel1 & DMC_RUN) == 0; i--)
		;
	if ((addr->bsel1 & DMC_RUN) == 0) {
		printf("dmcprobe: can't start device\n" );
		return (0);
	}
	addr->bsel0 = DMC_RQI|DMC_IEI;
	/* let's be paranoid */
	addr->bsel0 |= DMC_RQI|DMC_IEI;
	DELAY(1000000);
	addr->bsel1 = DMC_MCLR;
	for (i = 100000; i && (addr->bsel1 & DMC_RUN) == 0; i--)
		;
	return (1);
}

/*
 * Interface exists: make available by filling in network interface
 * record.  System will initialize the interface when it is ready
 * to accept packets.
 */
dmcattach(ui)
	register struct uba_device *ui;
{
	register struct dmc_softc *sc = &dmc_softc[ui->ui_unit];

	sc->sc_if.if_unit = ui->ui_unit;
	sc->sc_if.if_name = "dmc";
	sc->sc_if.if_mtu = DMCMTU;
	sc->sc_if.if_init = dmcinit;
	sc->sc_if.if_output = dmcoutput;
	sc->sc_if.if_ioctl = dmcioctl;
	sc->sc_if.if_reset = dmcreset;
	sc->sc_if.if_watchdog = dmctimeout;
	sc->sc_if.if_flags = IFF_POINTOPOINT;
	sc->sc_ifuba.iff_flags = UBA_CANTWAIT;

	if_attach(&sc->sc_if);
}

/*
 * Reset of interface after UNIBUS reset.
 * If interface is on specified UBA, reset its state.
 */
dmcreset(unit, uban)
	int unit, uban;
{
	register struct uba_device *ui;
	register struct dmc_softc *sc = &dmc_softc[unit];

	if (unit >= NDMC || (ui = dmcinfo[unit]) == 0 || ui->ui_alive == 0 ||
	    ui->ui_ubanum != uban)
		return;
	printf(" dmc%d", unit);
	sc->sc_flag = 0;
	sc->sc_if.if_flags &= ~IFF_RUNNING;
	dmcinit(unit);
}

/*
 * Initialization of interface; reinitialize UNIBUS usage.
 */
dmcinit(unit)
	int unit;
{
	register struct dmc_softc *sc = &dmc_softc[unit];
	register struct uba_device *ui = dmcinfo[unit];
	register struct dmcdevice *addr;
	register struct ifnet *ifp = &sc->sc_if;
	register struct ifrw *ifrw;
	register struct ifxmt *ifxp;
	register struct dmcbufs *rp;
	register struct dmc_command *qp;
	struct ifaddr *ifa;
	int base;
	int s;

	addr = (struct dmcdevice *)ui->ui_addr;

	/*
	 * Check to see that an address has been set
	 * (both local and destination for an address family).
	 */
	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
		if (ifa->ifa_addr->sa_family && ifa->ifa_dstaddr->sa_family)
			break;
	if (ifa == (struct ifaddr *) 0)
		return;

	if ((addr->bsel1&DMC_RUN) == 0) {
		printf("dmcinit: DMC not running\n");
		ifp->if_flags &= ~IFF_UP;
		return;
	}
	/* map base table */
	if ((sc->sc_flag & DMC_BMAPPED) == 0) {
		sc->sc_ubinfo = uballoc(ui->ui_ubanum,
			(caddr_t)&dmc_base[unit], sizeof (struct dmc_base), 0);
		sc->sc_flag |= DMC_BMAPPED;
	}
	/* initialize UNIBUS resources */
	sc->sc_iused = sc->sc_oused = 0;
	if ((ifp->if_flags & IFF_RUNNING) == 0) {
		if (if_ubaminit(&sc->sc_ifuba, ui->ui_ubanum,
		    sizeof(struct dmc_header), (int)btoc(DMCMTU),
		    sc->sc_ifr, NRCV, sc->sc_ifw, NXMT) == 0) {
			printf("dmc%d: can't allocate uba resources\n", unit);
			ifp->if_flags &= ~IFF_UP;
			return;
		}
		ifp->if_flags |= IFF_RUNNING;
	}
	sc->sc_flag &= ~DMC_ONLINE;
	sc->sc_flag |= DMC_RUNNING;
	/*
	 * Limit packets enqueued until we see if we're on the air.
	 */
	ifp->if_snd.ifq_maxlen = 3;

	/* initialize buffer pool */
	/* receives */
	ifrw = &sc->sc_ifr[0];
	for (rp = &sc->sc_rbufs[0]; rp < &sc->sc_rbufs[NRCV]; rp++) {
		rp->ubinfo = UBAI_ADDR(ifrw->ifrw_info);
		rp->cc = DMCMTU + sizeof (struct dmc_header);
		rp->flags = DBUF_OURS|DBUF_RCV;
		ifrw++; 
	}
	/* transmits */
	ifxp = &sc->sc_ifw[0];
	for (rp = &sc->sc_xbufs[0]; rp < &sc->sc_xbufs[NXMT]; rp++) {
		rp->ubinfo = UBAI_ADDR(ifxp->ifw_info);
		rp->cc = 0;
		rp->flags = DBUF_OURS|DBUF_XMIT;
		ifxp++; 
	}

	/* set up command queues */
	sc->sc_qfreeh = sc->sc_qfreet
		 = sc->sc_qhead = sc->sc_qtail = sc->sc_qactive =
		(struct dmc_command *)0;
	/* set up free command buffer list */
	for (qp = &sc->sc_cmdbuf[0]; qp < &sc->sc_cmdbuf[NCMDS]; qp++) {
		QUEUE_AT_HEAD(qp, sc->sc_qfreeh, sc->sc_qfreet);
	}

	/* base in */
	base = UBAI_ADDR(sc->sc_ubinfo);
	dmcload(sc, DMC_BASEI, (u_short)base, (base>>2) & DMC_XMEM);
	/* specify half duplex operation, flags tell if primary */
	/* or secondary station */
	if (ui->ui_flags == 0)
		/* use DDCMP mode in full duplex */
		dmcload(sc, DMC_CNTLI, 0, 0);
	else if (ui->ui_flags == 1)
		/* use MAINTENENCE mode */
		dmcload(sc, DMC_CNTLI, 0, DMC_MAINT );
	else if (ui->ui_flags == 2)
		/* use DDCMP half duplex as primary station */
		dmcload(sc, DMC_CNTLI, 0, DMC_HDPLX);
	else if (ui->ui_flags == 3)
		/* use DDCMP half duplex as secondary station */
		dmcload(sc, DMC_CNTLI, 0, DMC_HDPLX | DMC_SEC);

	/* enable operation done interrupts */
	while ((addr->bsel2 & DMC_IEO) == 0)
		addr->bsel2 |= DMC_IEO;
	s = spl5();
	/* queue first NRCV buffers for DMC to fill */
	for (rp = &sc->sc_rbufs[0]; rp < &sc->sc_rbufs[NRCV]; rp++) {
		rp->flags |= DBUF_DMCS;
		dmcload(sc, DMC_READ, rp->ubinfo,
			(((rp->ubinfo>>2)&DMC_XMEM) | rp->cc));
		sc->sc_iused++;
	}
	splx(s);
}

/*
 * Start output on interface.  Get another datagram
 * to send from the interface queue and map it to
 * the interface before starting output.
 *
 * Must be called at spl 5
 */
dmcstart(unit)
	int unit;
{
	register struct dmc_softc *sc = &dmc_softc[unit];
	struct mbuf *m;
	register struct dmcbufs *rp;
	register int n;

	/*
	 * Dequeue up to NXMT requests and map them to the UNIBUS.
	 * If no more requests, or no dmc buffers available, just return.
	 */
	n = 0;
	for (rp = &sc->sc_xbufs[0]; rp < &sc->sc_xbufs[NXMT]; rp++ ) {
		/* find an available buffer */
		if ((rp->flags & DBUF_DMCS) == 0) {
			IF_DEQUEUE(&sc->sc_if.if_snd, m);
			if (m == 0)
				return;
			/* mark it dmcs */
			rp->flags |= (DBUF_DMCS);
			/*
			 * Have request mapped to UNIBUS for transmission
			 * and start the output.
			 */
			rp->cc = if_ubaput(&sc->sc_ifuba, &sc->sc_ifw[n], m);
			rp->cc &= DMC_CCOUNT;
			if (++sc->sc_oused == 1)
				sc->sc_if.if_timer = dmc_timeout;
			dmcload(sc, DMC_WRITE, rp->ubinfo, 
				rp->cc | ((rp->ubinfo>>2)&DMC_XMEM));
		}
		n++;
	}
}

/*
 * Utility routine to load the DMC device registers.
 */
dmcload(sc, type, w0, w1)
	register struct dmc_softc *sc;
	int type;
	u_short w0, w1;
{
	register struct dmcdevice *addr;
	register int unit, sps;
	register struct dmc_command *qp;

	unit = sc - dmc_softc;
	addr = (struct dmcdevice *)dmcinfo[unit]->ui_addr;
	sps = spl5();

	/* grab a command buffer from the free list */
	if ((qp = sc->sc_qfreeh) == (struct dmc_command *)0)
		panic("dmc command queue overflow");
	DEQUEUE(sc->sc_qfreeh, sc->sc_qfreet);

	/* fill in requested info */
	qp->qp_cmd = (type | DMC_RQI);
	qp->qp_ubaddr = w0;
	qp->qp_cc = w1;
	
	if (sc->sc_qactive) {	/* command in progress */
		if (type == DMC_READ) {
			QUEUE_AT_HEAD(qp, sc->sc_qhead, sc->sc_qtail);
		} else {
			QUEUE_AT_TAIL(qp, sc->sc_qhead, sc->sc_qtail);
		}
	} else {	/* command port free */
		sc->sc_qactive = qp;
		addr->bsel0 = qp->qp_cmd;
		dmcrint(unit);
	}
	splx(sps);
}

/*
 * DMC interface receiver interrupt.
 * Ready to accept another command,
 * pull one off the command queue.
 */
dmcrint(unit)
	int unit;
{
	register struct dmc_softc *sc;
	register struct dmcdevice *addr;
	register struct dmc_command *qp;
	register int n;

	addr = (struct dmcdevice *)dmcinfo[unit]->ui_addr;
	sc = &dmc_softc[unit];
	if ((qp = sc->sc_qactive) == (struct dmc_command *) 0) {