usr/src/sys/vax/uba/tm.c

/*      tm.c    4.13    %G%     */

#include "tm.h"
#if NTM03 > 0
/*
 * TM tape driver
 *
 * THIS HANDLES ONLY ONE DRIVE ON ONE CONTROLER, AS WE HAVE NO
 * WAY TO TEST MULTIPLE TRANSPORTS.
 */
#define DELAY(N)                { register int d = N; while (--d > 0); }
#include "../h/param.h"
#include "../h/buf.h"
#include "../h/dir.h"
#include "../h/conf.h"
#include "../h/user.h"
#include "../h/file.h"
#include "../h/map.h"
#include "../h/pte.h"
#include "../h/vm.h"
#include "../h/uba.h"
#include "../h/mtio.h"
#include "../h/ioctl.h"
#include "../h/cmap.h"
#include "../h/cpu.h"

#include "../h/tmreg.h"

struct  buf     ctmbuf;
struct  buf     rtmbuf;

int     tmcntrlr(), tmslave(), tmdgo(), tmintr();
struct  uba_minfo *tmminfo[NTM03];
struct  uba_dinfo *tmdinfo[NTM11];
u_short tmstd[] = { 0772520, 0 };
struct  uba_driver tmdriver =
        { tmcntrlr, tmslave, tmdgo, 0, tmstd, "mt", tmdinfo, "tm", tmminfo };

/* bits in minor device */
#define T_NOREWIND      04
#define T_1600BPI       08

#define INF     (daddr_t)1000000L

struct  tm_softc {
        char    sc_openf;
        char    sc_flags;
        daddr_t sc_blkno;
        daddr_t sc_nxrec;
        u_short sc_erreg;
        u_short sc_dsreg;
        short   sc_resid;
} tm_softc[NTM03];

#define SSEEK   1               /* seeking */
#define SIO     2               /* doing seq i/o */
#define SCOM    3               /* sending control command */

#define LASTIOW 1               /* last op was a write */
#define WAITREW 2               /* someone is waiting for a rewind */

/*
 * Determine if there is a controller for
 * a tm at address reg.  Our goal is to make the
 * device interrupt.
 */
tmcntrlr(um, reg)
        struct uba_minfo *um;
        caddr_t reg;
{
        register int br, cvec;

        ((struct device *)reg)->tmcs = IENABLE;
        /*
         * If this is a tm03/tc11, it ought to have interrupted
         * by now, if it isn't (ie: it is a ts04) then we just
         * hope that it didn't interrupt, so autoconf will ignore it.
         * Just in case, we will reference one
         * of the more distant registers, and hope for a machine
         * check, or similar disaster if this is a ts.
         *
         * Note: on an 11/780, badaddr will just generate
         * a uba error for a ts; but our caller will notice that
         * so we won't check for it.
         */
        if (badaddr(&((struct device *)reg)->tmrd, 2))
                return (0);
        return (1);
}

tmslave(ui, reg)
        struct uba_dinfo *ui;
        caddr_t reg;
{

        /*
         * Due to a design flaw, we cannot ascertain if the tape
         * exists or not unless it is on line - ie: unless a tape is
         * mounted. This is too servere a restriction to bear.
         * As we can only handle one tape, we might just as well insist
         * that it be slave #0, and just assume that it exists.
         * Something better will have to be done if you have two
         * tapes on one controller, or two controllers
         */
        if (ui->ui_slave != 0 || tmdinfo[0])
                return(0);
        return (1);
}

tmopen(dev, flag)
        dev_t dev;
        int flag;
{
        register ds, unit;
        register struct uba_dinfo *ui;
        register struct tm_softc *sc = &tm_softc[0];

        tmminfo[0]->um_tab.b_flags |= B_TAPE;
        unit = minor(dev)&03;
        if (unit>=NTM11 || sc->sc_openf || (ui = tmdinfo[0]) == 0 || ui->ui_alive==0) {
                u.u_error = ENXIO;              /* out of range or open */
                return;
        }
        tmcommand(dev, NOP, 1);
        if ((sc->sc_erreg&SELR) == 0) {
                u.u_error = EIO;
                goto eio;
        }
        sc->sc_openf = 1;
        if (sc->sc_erreg&RWS)
                tmwaitrws(dev);                 /* wait for rewind complete */
        while (sc->sc_erreg&SDWN)
                tmcommand(dev, NOP, 1);         /* await settle down */
        if ((sc->sc_erreg&TUR)==0 ||
            ((flag&(FREAD|FWRITE)) == FWRITE && (sc->sc_erreg&WRL))) {
                ((struct device *)ui->ui_addr)->tmcs = DCLR|GO;
                u.u_error = EIO;                /* offline or write protect */
        }
        if (u.u_error != 0) {
                sc->sc_openf = 0;
                if (u.u_error == EIO)
eio:
                        uprintf("tape offline or protected\n");
                return;
        }
        sc->sc_blkno = (daddr_t)0;
        sc->sc_nxrec = INF;
        sc->sc_flags = 0;
        sc->sc_openf = 1;
}

tmwaitrws(dev)
        register dev;
{
        register struct device *addr =
            (struct device *)tmdinfo[0]->ui_addr;
        register struct tm_softc *sc = &tm_softc[0];

        spl5();
        for (;;) {
                if ((addr->tmer&RWS) == 0) {
                        spl0();         /* rewind complete */
                        return;
                }
                sc->sc_flags |= WAITREW;
                sleep((caddr_t)&sc->sc_flags, PRIBIO);
        }
}

tmclose(dev, flag)
        register dev_t dev;
        register flag;
{
        register struct tm_softc *sc = &tm_softc[0];

        if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&LASTIOW))) {
                tmcommand(dev, WEOF, 1);
                tmcommand(dev, WEOF, 1);
                tmcommand(dev, SREV, 1);
        }
        if ((minor(dev)&T_NOREWIND) == 0)
                tmcommand(dev, REW, 1);
        sc->sc_openf = 0;
}

tmcommand(dev, com, count)
        dev_t dev;
        int com, count;
{
        register struct buf *bp;

        bp = &ctmbuf;
        (void) spl5();
        while (bp->b_flags&B_BUSY) {
                bp->b_flags |= B_WANTED;
                sleep((caddr_t)bp, PRIBIO);
        }
        bp->b_flags = B_BUSY|B_READ;
        (void) spl0();
        bp->b_dev = dev;
        bp->b_repcnt = -count;
        bp->b_command = com;
        bp->b_blkno = 0;
        tmstrategy(bp);
        iowait(bp);
        if (bp->b_flags&B_WANTED)
                wakeup((caddr_t)bp);
        bp->b_flags &= B_ERROR;
}

tmstrategy(bp)
        register struct buf *bp;
{
        register daddr_t *p;
        register struct buf *tmi;

        tmwaitrws(bp->b_dev);
        if (bp != &ctmbuf) {
                p = &tm_softc[0].sc_nxrec;
                if (dbtofsb(bp->b_blkno) > *p) {
                        bp->b_flags |= B_ERROR;
                        bp->b_error = ENXIO;            /* past EOF */
                        iodone(bp);
                        return;
                } else if (dbtofsb(bp->b_blkno) == *p && bp->b_flags&B_READ) {
                        bp->b_resid = bp->b_bcount;
                        clrbuf(bp);                     /* at EOF */
                        iodone(bp);
                        return;
                } else if ((bp->b_flags&B_READ) == 0)
                        *p = dbtofsb(bp->b_blkno) + 1;  /* write sets EOF */
        }
        bp->av_forw = NULL;
        (void) spl5();
        tmi = &tmminfo[0]->um_tab;
        if (tmi->b_actf == NULL)
                tmi->b_actf = bp;
        else
                tmi->b_actl->av_forw = bp;
        tmi->b_actl = bp;
        if (tmi->b_active == 0)
                tmstart();
        (void) spl0();
}

tmstart()
{
        register struct buf *bp;
        register struct uba_minfo *um = tmminfo[0];
        register struct uba_dinfo *ui;
        register struct device *addr;
        register struct tm_softc *sc = &tm_softc[0];
        int cmd, s;
        daddr_t blkno;

loop:
        if ((bp = um->um_tab.b_actf) == 0)
                return;
        ui = tmdinfo[0];
        addr = (struct device *)ui->ui_addr;
        sc->sc_dsreg = addr->tmcs;
        sc->sc_erreg = addr->tmer;
        sc->sc_resid = addr->tmbc;
        sc->sc_flags &= ~LASTIOW;
        if (sc->sc_openf < 0 || (addr->tmcs&CUR) == 0) {
                /* sc->sc_openf = -1; ??? */
                bp->b_flags |= B_ERROR;         /* hard error'ed or !SELR */
                goto next;
        }
        cmd = IENABLE | GO;
        if ((minor(bp->b_dev) & T_1600BPI) == 0)
                cmd |= D800;
        if (bp == &ctmbuf) {
                if (bp->b_command == NOP)
                        goto next;              /* just get status */
                else {
                        cmd |= bp->b_command;
                        um->um_tab.b_active = SCOM;
                        if (bp->b_command == SFORW || bp->b_command == SREV)
                                addr->tmbc = bp->b_repcnt;
                        addr->tmcs = cmd;
                        return;
                }
        }
        if ((blkno = sc->sc_blkno) == dbtofsb(bp->b_blkno)) {
                addr->tmbc = -bp->b_bcount;
                if ((bp->b_flags&B_READ) == 0) {
                        if (um->um_tab.b_errcnt)
                                cmd |= WIRG;
                        else
                                cmd |= WCOM;
                } else
                        cmd |= RCOM;
                um->um_tab.b_active = SIO;
                if (um->um_ubinfo)
                        panic("tmstart");
                um->um_cmd = cmd;
                ubago(ui);
                splx(s);
                return;
        }
        um->um_tab.b_active = SSEEK;
        if (blkno < dbtofsb(bp->b_blkno)) {
                cmd |= SFORW;
                addr->tmbc = blkno - dbtofsb(bp->b_blkno);
        } else {
                cmd |= SREV;
                addr->tmbc = dbtofsb(bp->b_blkno) - blkno;
        }
        addr->tmcs = cmd;
        return;

next:
        ubarelse(um->um_ubanum, &um->um_ubinfo);
        um->um_tab.b_actf = bp->av_forw;
        iodone(bp);
        goto loop;
}

tmdgo(um)
        register struct uba_minfo *um;
{
        register struct device *addr = (struct device *)um->um_addr;

        printf("tmdgo %x %x\n", um->um_ubinfo, um->um_cmd);
        addr->tmba = um->um_ubinfo;
        addr->tmcs = um->um_cmd | ((um->um_ubinfo >> 12) & 0x30);
}

/*ARGSUSED*/
tmintr(d)
        int d;
{
        register struct buf *bp;
        register struct uba_minfo *um = tmminfo[0];
        register struct device *addr = (struct device *)tmdinfo[0]->ui_addr;
        register struct tm_softc *sc = &tm_softc[0];
        register state;

        printf("tmintr %x %x\n", um->um_tab.b_actf, um->um_tab.b_active);
        if (sc->sc_flags&WAITREW && (addr->tmer&RWS) == 0) {
                sc->sc_flags &= ~WAITREW;
                wakeup((caddr_t)&sc->sc_flags);
        }
        if ((bp = um->um_tab.b_actf) == NULL)
                return;
        sc->sc_dsreg = addr->tmcs;
        sc->sc_erreg = addr->tmer;
        sc->sc_resid = addr->tmbc;
        if ((bp->b_flags & B_READ) == 0)
                sc->sc_flags |= LASTIOW;
        state = um->um_tab.b_active;
        um->um_tab.b_active = 0;
        if (addr->tmcs&ERROR) {
                while(addr->tmer & SDWN)
                        ;                       /* await settle down */
                if (addr->tmer&EOF) {
                        tmseteof(bp);   /* set blkno and nxrec */
                        state = SCOM;
                        addr->tmbc = -bp->b_bcount;
                        goto errout;
                }
                if ((bp->b_flags&B_READ) && (addr->tmer&(HARD|SOFT)) == RLE)
                        goto out;
                if ((addr->tmer&HARD)==0 && state==SIO) {
                        if (++um->um_tab.b_errcnt < 7) {
                                if((addr->tmer&SOFT) == NXM)
                                        printf("TM UBA late error\n");
                                sc->sc_blkno++;
                                ubarelse(um->um_ubanum, &um->um_ubinfo);
                                tmstart();
                                return;
                        }
                } else if (sc->sc_openf>0 && bp != &rtmbuf)
                        sc->sc_openf = -1;
                deverror(bp, sc->sc_erreg, sc->sc_dsreg);
                bp->b_flags |= B_ERROR;
                state = SIO;
        }
out:
        switch (state) {

        case SIO:
                sc->sc_blkno++;
                /* fall into ... */

        case SCOM:
                if (bp == &ctmbuf) {
                        switch (bp->b_command) {
                        case SFORW:
                                sc->sc_blkno -= bp->b_repcnt;
                                break;

                        case SREV:
                                sc->sc_blkno += bp->b_repcnt;
                                break;

                        default:
                                if (++bp->b_repcnt < 0) {
                                        tmstart();      /* continue */
                                        return;
                                }
                        }
                }
errout:
                um->um_tab.b_errcnt = 0;
                um->um_tab.b_actf = bp->av_forw;
                bp->b_resid = -addr->tmbc;
                ubarelse(um->um_ubanum, &um->um_ubinfo);
                iodone(bp);
                break;

        case SSEEK:
                sc->sc_blkno = dbtofsb(bp->b_blkno);
                break;

        default:
                return;
        }
        tmstart();
}

tmseteof(bp)
        register struct buf *bp;
{
        register struct device *addr =
            (struct device *)tmdinfo[0]->ui_addr;
        register struct tm_softc *sc = &tm_softc[0];

        if (bp == &ctmbuf) {
                if (sc->sc_blkno > dbtofsb(bp->b_blkno)) {
                        /* reversing */
                        sc->sc_nxrec = dbtofsb(bp->b_blkno) - addr->tmbc;
                        sc->sc_blkno = sc->sc_nxrec;
                } else {
                        /* spacing forward */
                        sc->sc_blkno = dbtofsb(bp->b_blkno) + addr->tmbc;
                        sc->sc_nxrec = sc->sc_blkno - 1;
                }
                return;
        }
        /* eof on read */
        sc->sc_nxrec = dbtofsb(bp->b_blkno);
}

tmread(dev)
{

        tmphys(dev);
        physio(tmstrategy, &rtmbuf, dev, B_READ, minphys);
}

tmwrite(dev)
{

        tmphys(dev);
        physio(tmstrategy, &rtmbuf, dev, B_WRITE, minphys);
}

tmphys(dev)
{
        register daddr_t a;
        register struct tm_softc *sc = &tm_softc[0];

        a = dbtofsb(u.u_offset >> 9);
        sc->sc_blkno = a;
        sc->sc_nxrec = a + 1;
}

/*ARGSUSED*/
tmioctl(dev, cmd, addr, flag)
        caddr_t addr;
        dev_t dev;
{
        register callcount;
        register struct tm_softc *sc = &tm_softc[0];
        int fcount;
        struct mtop mtop;
        struct mtget mtget;
        /* we depend of the values and order of the MT codes here */
        static tmops[] = {WEOF, SFORW, SREV, SFORW, SREV, REW, OFFL, NOP};

        switch(cmd) {
                case MTIOCTOP:  /* tape operation */
                if (copyin((caddr_t)addr, (caddr_t)&mtop, sizeof(mtop))) {
                        u.u_error = EFAULT;
                        return;
                }
                switch(mtop.mt_op) {
                case MTWEOF: case MTFSF: case MTBSF:
                        callcount = mtop.mt_count;
                        fcount = INF;
                        break;
                case MTFSR: case MTBSR:
                        callcount = 1;
                        fcount = mtop.mt_count;
                        break;
                case MTREW: case MTOFFL: case MTNOP:
                        callcount = 1;
                        fcount = 1;
                        break;
                default:
                        u.u_error = ENXIO;
                        return;
                }
                if (callcount <= 0 || fcount <= 0)
                        u.u_error = ENXIO;
                else while (--callcount >= 0) {
                        tmcommand(dev, tmops[mtop.mt_op], fcount);
                        if ((mtop.mt_op == MTFSR || mtop.mt_op == MTBSR) &&
                            ctmbuf.b_resid) {
                                u.u_error = EIO;
                                break;
                        }
                        if ((ctmbuf.b_flags&B_ERROR) ||
                            sc->sc_erreg&BOT)
                                break;
                }
                geterror(&ctmbuf);
                return;
        case MTIOCGET:
                mtget.mt_dsreg = sc->sc_dsreg;
                mtget.mt_erreg = sc->sc_erreg;
                mtget.mt_resid = sc->sc_resid;
                if (copyout((caddr_t)&mtget, addr, sizeof(mtget)))
                        u.u_error = EFAULT;
                return;
        default:
                u.u_error = ENXIO;
        }
}

#define DBSIZE  20

tmdump()
{
        register struct uba_dinfo *ui;
        register struct uba_regs *up;
        register struct device *addr;
        int blk, num;
        int start;

        start = 0;
        num = maxfree;
#define phys(a,b)       ((b)((int)(a)&0x7fffffff))
        if (tmdinfo[0] == 0) {
                printf("dna\n");
                return (-1);
        }
        ui = phys(tmdinfo[0], struct uba_dinfo *);
        up = phys(ui->ui_hd, struct uba_hd *)->uh_physuba;
#if VAX780
        if (cpu == VAX_780)
                ubainit(up);
#endif
        DELAY(1000000);
        addr = (struct device *)ui->ui_physaddr;
        tmwait(addr);
        addr->tmcs = DCLR | GO;
        while (num > 0) {
                blk = num > DBSIZE ? DBSIZE : num;
                tmdwrite(start, blk, addr, up);
                start += blk;
                num -= blk;
        }
        tmeof(addr);
        tmeof(addr);
        tmwait(addr);
        addr->tmcs = REW | GO;
        tmwait(addr);
        return (0);
}

tmdwrite(buf, num, addr, up)
        register buf, num;
        register struct device *addr;
        struct uba_regs *up;
{
        register struct pte *io;
        register int npf;

        tmwait(addr);
        io = up->uba_map;
        npf = num+1;
        while (--npf != 0)
                 *(int *)io++ = (buf++ | (1<<UBA_DPSHIFT) | UBA_MRV);
        *(int *)io = 0;
        addr->tmbc = -(num*NBPG);
        addr->tmba = 0;
        addr->tmcs = WCOM | GO;
}

tmwait(addr)
        register struct device *addr;
{
        register s;

        do
                s = addr->tmcs;
        while ((s & CUR) == 0);
}

tmeof(addr)
        struct device *addr;
{

        tmwait(addr);
        addr->tmcs = WEOF | GO;
}
#endif