+/* mt.c 1.2 81/10/27 */
+
+#include "mu.h"
+#if NMT > 0
+/*
+ * TM78/TU78 tape driver
+ *
+ * Behavior in complex error situations is uncertain...
+ *
+ * TODO:
+ * test error recovery
+ * add odd byte count kludge from VMS driver
+ * write dump routine
+ */
+#include "../h/param.h"
+#include "../h/systm.h"
+#include "../h/buf.h"
+#include "../h/conf.h"
+#include "../h/dir.h"
+#include "../h/file.h"
+#include "../h/user.h"
+#include "../h/map.h"
+#include "../h/pte.h"
+#include "../h/mbareg.h"
+#include "../h/mbavar.h"
+#include "../h/mtio.h"
+#include "../h/ioctl.h"
+#include "../h/cmap.h"
+#include "../h/cpu.h"
+
+#include "../h/mtreg.h"
+
+struct buf rmtbuf[NMT];
+struct buf cmtbuf[NMT];
+
+short mttypes[] =
+ { MBDT_TU78, 0 };
+struct mba_device *mtinfo[NMT];
+int mtattach(), mtslave(), mtustart(), mtstart(), mtndtint(), mtdtint();
+struct mba_driver mtdriver =
+ { mtattach, mtslave, mtustart, mtstart, mtdtint, mtndtint,
+ mttypes, "mt", "mu", mtinfo };
+
+#define MASKREG(r) ((r) & 0xffff)
+
+/* bits in minor device */
+#define MUUNIT(dev) (minor(dev)&03)
+#define H_NOREWIND 04
+#define H_6250BPI 08
+
+#define MTUNIT(dev) (mutomt[MUUNIT(dev)])
+
+#define INF (daddr_t)1000000L /* a block number that wont exist */
+
+struct mu_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;
+ short sc_dens;
+ struct mba_device *sc_mi;
+ int sc_slave;
+} mu_softc[NMU];
+short mutomt[NMU];
+
+/*
+ * Bits for sc_flags.
+ */
+#define H_WRITTEN 1 /* last operation was a write */
+
+char mtds_bits[] = MTDS_BITS;
+
+/*ARGSUSED*/
+mtattach(mi)
+ struct mba_device *mi;
+{
+
+}
+
+mtslave(mi, ms)
+ struct mba_device *mi;
+ struct mba_slave *ms;
+{
+ register struct mu_softc *sc = &mu_softc[ms->ms_unit];
+ register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
+ int s = spl7(), rtn = 0;
+
+ mtaddr->mtas = -1;
+ mtaddr->mtncs[ms->ms_slave] = MT_SENSE|MT_GO;
+ while (mtaddr->mtas == 0)
+ ;
+ if ((mtaddr->mtner & MTER_INTCODE) == MTER_DONE &&
+ (mtaddr->mtds & MTDS_PRES)) {
+ sc->sc_mi = mi;
+ sc->sc_slave = ms->ms_slave;
+ mutomt[ms->ms_unit] = mi->mi_unit;
+ rtn = 1;
+ }
+ mtaddr->mtas = mtaddr->mtas;
+ splx(s);
+ return (rtn);
+}
+
+mtopen(dev, flag)
+ dev_t dev;
+ int flag;
+{
+ register int muunit;
+ register struct mba_device *mi;
+ register struct mu_softc *sc;
+ int olddens, dens;
+
+ muunit = MUUNIT(dev);
+ if (muunit >= NMU || (sc = &mu_softc[muunit])->sc_openf ||
+ (mi = mtinfo[MTUNIT(dev)]) == 0 || mi->mi_alive == 0) {
+ u.u_error = ENXIO;
+ return;
+ }
+ olddens = sc->sc_dens;
+ dens = sc->sc_dens = (minor(dev)&H_6250BPI) ? MT_GCR : 0;
+ mtcommand(dev, MT_SENSE, 1);
+ sc->sc_dens = olddens;
+ if ((sc->sc_dsreg & MTDS_ONL) == 0) {
+ uprintf("mu%d: not online\n", muunit);
+ u.u_error = EIO;
+ return;
+ }
+ if ((flag&FWRITE) && (sc->sc_dsreg&MTDS_FPT)) {
+ uprintf("mu%d: no write ring\n", muunit);
+ u.u_error = EIO;
+ return;
+ }
+ if ((sc->sc_dsreg & MTDS_BOT) == 0 && (flag&FWRITE) &&
+ dens != sc->sc_dens) {
+ uprintf("mu%d: can't change density in mid-tape\n", muunit);
+ u.u_error = EIO;
+ return;
+ }
+ sc->sc_openf = 1;
+ sc->sc_blkno = (daddr_t)0;
+ sc->sc_nxrec = INF;
+ sc->sc_flags = 0;
+ sc->sc_dens = dens;
+}
+
+mtclose(dev, flag)
+ register dev_t dev;
+ register flag;
+{
+ register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];
+
+ if (flag == FWRITE || ((flag&FWRITE) && (sc->sc_flags&H_WRITTEN)))
+ mtcommand(dev, MT_CLS|sc->sc_dens, 1);
+ if ((minor(dev)&H_NOREWIND) == 0)
+ mtcommand(dev, MT_REW, 0);
+ sc->sc_openf = 0;
+}
+
+mtcommand(dev, com, count)
+ dev_t dev;
+ int com, count;
+{
+ register struct buf *bp;
+
+ bp = &cmtbuf[MTUNIT(dev)];
+ (void) spl5();
+ while (bp->b_flags&B_BUSY) {
+ if(bp->b_repcnt == 0 && (bp->b_flags&B_DONE))
+ break;
+ 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_command = com;
+ bp->b_repcnt = count;
+ bp->b_blkno = 0;
+ mtstrategy(bp);
+ if (count == 0)
+ return;
+ iowait(bp);
+ if (bp->b_flags&B_WANTED)
+ wakeup((caddr_t)bp);
+ bp->b_flags &= B_ERROR;
+}
+
+mtstrategy(bp)
+ register struct buf *bp;
+{
+ register struct mba_device *mi = mtinfo[MTUNIT(bp->b_dev)];
+ register struct buf *dp;
+
+ bp->av_forw = NULL;
+ dp = &mi->mi_tab;
+ (void) spl5();
+ if (dp->b_actf == NULL)
+ dp->b_actf = bp;
+ else
+ dp->b_actl->av_forw = bp;
+ dp->b_actl = bp;
+ if (dp->b_active == 0)
+ mbustart(mi);
+ (void) spl0();
+}
+
+mtustart(mi)
+ register struct mba_device *mi;
+{
+ register struct mtdevice *mtaddr =
+ (struct mtdevice *)mi->mi_drv;
+ register struct buf *bp = mi->mi_tab.b_actf;
+ register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];
+ daddr_t blkno;
+
+ sc->sc_flags &= ~H_WRITTEN;
+ if (sc->sc_openf < 0) {
+ bp->b_flags |= B_ERROR;
+ return (MBU_NEXT);
+ }
+ if (bp != &cmtbuf[MTUNIT(bp->b_dev)]) {
+ if (dbtofsb(bp->b_blkno) > sc->sc_nxrec) {
+ bp->b_flags |= B_ERROR;
+ bp->b_error = ENXIO;
+ return (MBU_NEXT);
+ }
+ if (dbtofsb(bp->b_blkno) == sc->sc_nxrec &&
+ bp->b_flags&B_READ) {
+ bp->b_resid = bp->b_bcount;
+ clrbuf(bp);
+ return (MBU_NEXT);
+ }
+ if ((bp->b_flags&B_READ)==0)
+ sc->sc_nxrec = dbtofsb(bp->b_blkno) + 1;
+ } else {
+ mtaddr->mtncs[MUUNIT(bp->b_dev)] =
+ (bp->b_repcnt<<8)|bp->b_command|MT_GO;
+ return (MBU_STARTED);
+ }
+ if ((blkno = sc->sc_blkno) == dbtofsb(bp->b_blkno)) {
+ if (mi->mi_tab.b_errcnt == 2) {
+ mtaddr->mtca = MUUNIT(bp->b_dev);
+ } else {
+ mtaddr->mtbc = bp->b_bcount;
+ mtaddr->mtca = (1<<2)|MUUNIT(bp->b_dev);
+ }
+ return (MBU_DODATA);
+ }
+ if (blkno < dbtofsb(bp->b_blkno))
+ mtaddr->mtncs[MUUNIT(bp->b_dev)] =
+ (min(dbtofsb(bp->b_blkno) - blkno, 0377)<<8)| MT_SFORW|MT_GO;
+ else
+ mtaddr->mtncs[MUUNIT(bp->b_dev)] =
+ (min(blkno - dbtofsb(bp->b_blkno), 0377)<<8)| MT_SREV|MT_GO;
+ return (MBU_STARTED);
+}
+
+mtstart(mi)
+ register struct mba_device *mi;
+{
+ register struct buf *bp = mi->mi_tab.b_actf;
+ register struct mu_softc *sc = &mu_softc[MUUNIT(bp->b_dev)];
+
+ if (bp->b_flags & B_READ)
+ if (mi->mi_tab.b_errcnt == 2)
+ return(MT_READREV|MT_GO);
+ else
+ return(MT_READ|MT_GO);
+ else
+ return(MT_WRITE|sc->sc_dens|MT_GO);
+}
+
+mtdtint(mi, mbsr)
+ register struct mba_device *mi;
+ int mbsr;
+{
+ register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
+ register struct buf *bp = mi->mi_tab.b_actf;
+ register struct mu_softc *sc;
+
+ /* I'M NOT SURE IF THIS SHOULD ALWAYS BE THE CASE SO FOR NOW... */
+ if ((mtaddr->mtca&3) != MUUNIT(bp->b_dev)) {
+ printf("mt: wrong unit!\n");
+ mtaddr->mtca = MUUNIT(bp->b_dev);
+ }
+ sc = &mu_softc[MUUNIT(bp->b_dev)];
+ sc->sc_erreg = mtaddr->mter;
+ if((bp->b_flags & B_READ) == 0)
+ sc->sc_flags |= H_WRITTEN;
+ switch (sc->sc_erreg & MTER_INTCODE) {
+ case MTER_DONE:
+ case MTER_LONGREC:
+ if (mi->mi_tab.b_errcnt != 2)
+ sc->sc_blkno++;
+ bp->b_resid = 0;
+ break;
+
+ case MTER_NOTCAP:
+ printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));
+ goto err;
+
+ case MTER_TM:
+ case MTER_EOT:
+ sc->sc_blkno++;
+ err:
+ bp->b_resid = bp->b_bcount;
+ sc->sc_nxrec = dbtofsb(bp->b_blkno);
+ break;
+
+ case MTER_SHRTREC:
+ sc->sc_blkno++;
+ if (bp != &rmtbuf[MTUNIT(bp->b_dev)])
+ bp->b_flags |= B_ERROR;
+ if (mi->mi_tab.b_errcnt == 2)
+ bp->b_bcount = bp->b_resid; /* restore saved value */
+ bp->b_resid = bp->b_bcount - mtaddr->mtbc;
+ break;
+
+ case MTER_RDOPP:
+ mi->mi_tab.b_errcnt = 2; /* indicate "read opposite" */
+ bp->b_resid = bp->b_bcount; /* save it */
+ bp->b_bcount = mtaddr->mtbc; /* use this instead */
+ return(MBD_RETRY);
+
+ case MTER_RETRY:
+ mi->mi_tab.b_errcnt = 1; /* indicate simple retry */
+ return(MBD_RETRY);
+
+ case MTER_OFFLINE:
+ if (sc->sc_openf > 0) {
+ sc->sc_openf = -1;
+ printf("mu%d: offline\n", MUUNIT(bp->b_dev));
+ }
+ bp->b_flags |= B_ERROR;
+ break;
+
+ case MTER_FPT:
+ printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
+ bp->b_flags |= B_ERROR;
+ break;
+
+ default:
+ printf("mu%d: hard error bn%d mbsr=%b er=%x ds=%b\n",
+ MUUNIT(bp->b_dev), bp->b_blkno,
+ mbsr, mbsr_bits, sc->sc_erreg,
+ sc->sc_dsreg, mtds_bits);
+ bp->b_flags |= B_ERROR;
+ mtaddr->mtid = MTID_CLR; /* reset the TM78 */
+ DELAY(250);
+ while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */
+ ;
+ return (MBD_DONE);
+ }
+ /* CHECK FOR MBA ERROR WHEN NO OTHER ERROR INDICATED? */
+ return (MBD_DONE);
+}
+
+mtndtint(mi)
+ register struct mba_device *mi;
+{
+ register struct mtdevice *mtaddr = (struct mtdevice *)mi->mi_drv;
+ register struct buf *bp = mi->mi_tab.b_actf;
+ register struct mu_softc *sc;
+ int er, fc, unit;
+
+ unit = (mtaddr->mtner >> 8) & 3;
+ er = MASKREG(mtaddr->mtner);
+ /* WILL THIS OCCUR IF ANOTHER DRIVE COMES ONLINE? */
+ if (bp == 0 || unit != MUUNIT(bp->b_dev)) { /* consistency check */
+ if ((er & MTER_INTCODE) != MTER_ONLINE)
+ printf("mt: unit %d random interrupt\n", unit);
+ return (MBN_SKIP);
+ }
+ if (bp == 0)
+ return (MBN_SKIP);
+ fc = (mtaddr->mtncs[unit] >> 8) & 0xff;
+ sc = &mu_softc[unit];
+ sc->sc_erreg = er;
+ sc->sc_resid = fc;
+ switch (er & MTER_INTCODE) {
+ case MTER_DONE:
+ if (bp == &cmtbuf[MTUNIT(bp->b_dev)]) {
+ done:
+ if (bp->b_command == MT_SENSE)
+ sc->sc_dsreg = MASKREG(mtaddr->mtds);
+ bp->b_resid = fc;
+ return (MBN_DONE);
+ }
+ /* this is UGLY! (but is it correct?) */
+ if ((fc = dbtofsb(bp->b_blkno) - sc->sc_blkno) < 0)
+ sc->sc_blkno -= min(0377, -fc);
+ else
+ sc->sc_blkno += min(0377, fc);
+ return (MBN_RETRY);
+
+ case MTER_RWDING:
+ return (MBN_SKIP); /* ignore "rewind started" interrupt */
+
+ case MTER_NOTCAP:
+ printf("mu%d: blank tape\n", MUUNIT(bp->b_dev));
+
+ case MTER_TM:
+ case MTER_EOT:
+ case MTER_LEOT:
+ if (sc->sc_blkno > dbtofsb(bp->b_blkno)) {
+ sc->sc_nxrec = dbtofsb(bp->b_blkno) + fc;
+ sc->sc_blkno = sc->sc_nxrec;
+ } else {
+ sc->sc_blkno = dbtofsb(bp->b_blkno) - fc;
+ sc->sc_nxrec = sc->sc_blkno - 1;
+ }
+ return (MBN_RETRY);
+
+ case MTER_FPT:
+ printf("mu%d: no write ring\n", MUUNIT(bp->b_dev));
+ bp->b_flags |= B_ERROR;
+ return (MBN_DONE);
+
+ case MTER_OFFLINE:
+ if (sc->sc_openf > 0) {
+ sc->sc_openf = -1;
+ printf("mu%d: offline\n", MUUNIT(bp->b_dev));
+ }
+ bp->b_flags |= B_ERROR;
+ return (MBN_DONE);
+
+ case MTER_BOT:
+ if (bp == &cmtbuf[MTUNIT(bp->b_dev)])
+ goto done;
+ /* FALL THROUGH */
+
+ default:
+ printf("mu%d: hard error bn%d er=%o ds=%b\n",
+ MUUNIT(bp->b_dev), bp->b_blkno,
+ sc->sc_erreg, sc->sc_dsreg, mtds_bits);
+ mtaddr->mtid = MTID_CLR; /* reset the TM78 */
+ DELAY(250);
+ while ((mtaddr->mtid & MTID_RDY) == 0) /* wait for it */
+ ;
+ bp->b_flags |= B_ERROR;
+ return (MBN_DONE);
+ }
+ /* NOTREACHED */
+}
+
+mtread(dev)
+ dev_t dev;
+{
+
+ mtphys(dev);
+ if (u.u_error)
+ return;
+ physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_READ, minphys);
+}
+
+mtwrite(dev)
+{
+
+ mtphys(dev);
+ if (u.u_error)
+ return;
+ physio(mtstrategy, &rmtbuf[MTUNIT(dev)], dev, B_WRITE, minphys);
+}
+
+mtphys(dev)
+ dev_t dev;
+{
+ register int mtunit;
+ register struct mu_softc *sc;
+ register struct mba_device *mi;
+ daddr_t a;
+
+ mtunit = MTUNIT(dev);
+ if (mtunit >= NMT || (mi = mtinfo[mtunit]) == 0 || mi->mi_alive == 0) {
+ u.u_error = ENXIO;
+ return;
+ }
+ a = u.u_offset >> 9;
+ sc = &mu_softc[MUUNIT(dev)];
+ sc->sc_blkno = dbtofsb(a);
+ sc->sc_nxrec = dbtofsb(a)+1;
+}
+
+/*ARGSUSED*/
+mtioctl(dev, cmd, addr, flag)
+ dev_t dev;
+ int cmd;
+ caddr_t addr;
+ int flag;
+{
+ register struct mu_softc *sc = &mu_softc[MUUNIT(dev)];
+ register struct buf *bp = &cmtbuf[MTUNIT(dev)];
+ register callcount;
+ register int n, op;
+ int fcount;
+ struct mtop mtop;
+ struct mtget mtget;
+ /* we depend of the values and order of the MT codes here */
+ static mtops[] =
+ {MT_WTM,MT_SFORWF,MT_SREVF,MT_SFORW,MT_SREV,MT_REW,MT_UNLOAD,MT_SENSE};
+
+ 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:
+ callcount = mtop.mt_count;
+ fcount = 1;
+ break;
+ case MTFSF: case MTBSF:
+ callcount = mtop.mt_count;
+ fcount = 1;
+ break;
+ case MTFSR: case MTBSR:
+ callcount = 1;
+ fcount = mtop.mt_count;
+ break;
+ case MTREW: case MTOFFL:
+ callcount = 1;
+ fcount = 1;
+ break;
+ default:
+ u.u_error = ENXIO;
+ return;
+ }
+ if (callcount <= 0 || fcount <= 0) {
+ u.u_error = ENXIO;
+ return;
+ }
+ op = mtops[mtop.mt_op];
+ if (op == MT_WTM)
+ op |= sc->sc_dens;
+ while (--callcount >= 0) {
+ register int n;
+
+ do {
+ n = min(fcount, 0xff);
+ mtcommand(dev, op, n);
+ fcount -= n;
+ } while (fcount);
+ if ((mtop.mt_op == MTFSR || mtop.mt_op == MTBSR) &&
+ bp->b_resid) {
+ u.u_error = EIO;
+ break;
+ }
+ if (bp->b_flags&B_ERROR)
+ break;
+ }
+ geterror(bp);
+ return;
+ case MTIOCGET:
+ mtget.mt_erreg = sc->sc_erreg;
+ mtget.mt_resid = sc->sc_resid;
+ mtcommand(dev, MT_SENSE, 1); /* update drive status */
+ mtget.mt_dsreg = sc->sc_dsreg;
+ mtget.mt_type = MT_ISMT;
+ if (copyout((caddr_t)&mtget, addr, sizeof(mtget)))
+ u.u_error = EFAULT;
+ return;
+ default:
+ u.u_error = ENXIO;
+ }
+}
+
+#define DBSIZE 20
+
+mtdump()
+{
+ register struct mba_device *mi;
+ register struct mba_regs *mp;
+ register struct mtdevice *mtaddr;
+ int blk, num;
+ int start;
+
+ start = 0;
+ num = maxfree;
+#define phys(a,b) ((b)((int)(a)&0x7fffffff))
+ if (mtinfo[0] == 0)
+ return (ENXIO);
+ mi = phys(mtinfo[0], struct mba_device *);
+ mp = phys(mi->mi_hd, struct mba_hd *)->mh_physmba;
+ mp->mba_cr = MBCR_IE;
+ mtaddr = (struct mtdevice *)&mp->mba_drv[mi->mi_drive];
+#ifdef notyet
+ mtaddr->mttc = MTTC_PDP11|MTTC_1600BPI;
+ mtaddr->mtcs1 = MT_DCLR|MT_GO;
+ while (num > 0) {
+ blk = num > DBSIZE ? DBSIZE : num;
+ mtdwrite(start, blk, mtaddr, mp);
+ start += blk;
+ num -= blk;
+ }
+ mteof(mtaddr);
+ mteof(mtaddr);
+ mtwait(mtaddr);
+ if (mtaddr->mtds&MTDS_ERR)
+ return (EIO);
+ mtaddr->mtcs1 = MT_REW|MT_GO;
+ return (0);
+}
+
+mtdwrite(dbuf, num, mtaddr, mp)
+ register dbuf, num;
+ register struct mtdevice *mtaddr;
+ struct mba_regs *mp;
+{
+ register struct pte *io;
+ register int i;
+
+ mtwait(mtaddr);
+ io = mp->mba_map;
+ for (i = 0; i < num; i++)
+ *(int *)io++ = dbuf++ | PG_V;
+ mtaddr->mtfc = -(num*NBPG);
+ mp->mba_sr = -1;
+ mp->mba_bcr = -(num*NBPG);
+ mp->mba_var = 0;
+ mtaddr->mtcs1 = MT_WCOM|MT_GO;
+}
+
+mtwait(mtaddr)
+ struct mtdevice *mtaddr;
+{
+ register s;
+
+ do
+ s = mtaddr->mtds;
+ while ((s & MTDS_DRY) == 0);
+}
+
+mteof(mtaddr)
+ struct mtdevice *mtaddr;
+{
+
+ mtwait(mtaddr);
+ mtaddr->mtcs1 = MT_WEOF|MT_GO;
+#endif notyet
+}
+#endif
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