.ref-Research-V6/usr/sys/dmr/dhdm.c

#
/*
 */

/*
 *      DM-BB driver
 */
#include "../param.h"
#include "../tty.h"
#include "../conf.h"

#define DMADDR  0170500

struct  tty dh11[];
int     ndh11;          /* Set by dh.c to number of lines */

#define DONE    0200
#define SCENABL 040
#define CLSCAN  01000
#define TURNON  07      /* RQ send, CD lead, line enable */
#define TURNOFF 1       /* line enable only */
#define CARRIER 0100

struct dmregs {
        int     dmcsr;
        int     dmlstat;
};

/*
 * Turn on the line associated with the (DH) device dev.
 */
dmopen(dev)
{
        register struct tty *tp;

        tp = &dh11[dev.d_minor];
        DMADDR->dmcsr = dev.d_minor;
        DMADDR->dmlstat = TURNON;
        if (DMADDR->dmlstat&CARRIER)
                tp->t_state =| CARR_ON;
        DMADDR->dmcsr = IENABLE|SCENABL;
        spl5();
        while ((tp->t_state&CARR_ON)==0)
                sleep(&tp->t_rawq, TTIPRI);
        spl0();
}

/*
 * If a DH line has the HUPCL mode,
 * turn off carrier when it is closed.
 */
dmclose(dev)
{
        register struct tty *tp;

        tp = &dh11[dev.d_minor];
        if (tp->t_flags&HUPCL) {
                DMADDR->dmcsr = dev.d_minor;
                DMADDR->dmlstat = TURNOFF;
                DMADDR->dmcsr = IENABLE|SCENABL;
        }
}

/*
 * DM11 interrupt.
 * Mainly, deal with carrier transitions.
 */
dmint()
{
        register struct tty *tp;

        if (DMADDR->dmcsr&DONE) {
                tp = &dh11[DMADDR->dmcsr&017];
                if (tp < &dh11[ndh11]) {
                        wakeup(tp);
                        if ((DMADDR->dmlstat&CARRIER)==0) {
                                if ((tp->t_state&WOPEN)==0) {
                                        signal(tp, SIGHUP);
                                        DMADDR->dmlstat = 0;
                                        flushtty(tp);
                                }
                                tp->t_state =& ~CARR_ON;
                        } else
                                tp->t_state =| CARR_ON;
                }
                DMADDR->dmcsr = IENABLE|SCENABL;
        }
}