1*3349Swnj /* ht.c 4.5 81/03/22 */ 2319Sbill 3319Sbill /* 43262Swnj * TM03/TU?? tape driver 5319Sbill */ 6319Sbill 73262Swnj #include "../h/htreg.h" 8319Sbill #include "../h/param.h" 9319Sbill #include "../h/inode.h" 10422Sbill #include "../h/pte.h" 113262Swnj #include "../h/mbareg.h" 12319Sbill #include "saio.h" 133262Swnj #include "savax.h" 14319Sbill 15*3349Swnj short httypes[] = 16*3349Swnj { MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 }; 17*3349Swnj 18*3349Swnj #define MASKREG(reg) ((reg)&0xffff) 19*3349Swnj 20319Sbill htopen(io) 213262Swnj register struct iob *io; 22319Sbill { 233262Swnj register int skip; 243262Swnj register struct htdevice *htaddr = (struct htdevice *)mbadrv(io->i_unit); 25319Sbill int i; 26319Sbill 27*3349Swnj for (i = 0; httypes[i]; i++) 28*3349Swnj if (httypes[i] == (htaddr->htdt&MBDT_TYPE)) 29*3349Swnj goto found; 30*3349Swnj _stop("not a tape\n"); 31*3349Swnj found: 323262Swnj mbainit(UNITTOMBA(io->i_unit)); 333262Swnj htaddr->htcs1 = HT_DCLR|HT_GO; 343262Swnj htstrategy(io, HT_REW); 35319Sbill skip = io->i_boff; 36319Sbill while (skip--) { 37319Sbill io->i_cc = -1; 383262Swnj while (htstrategy(io, HT_SFORW)) 39319Sbill ; 403262Swnj DELAY(65536); 413262Swnj htstrategy(io, HT_SENSE); 42319Sbill } 43319Sbill } 44319Sbill 45319Sbill htclose(io) 463262Swnj register struct iob *io; 47319Sbill { 483262Swnj 493262Swnj htstrategy(io, HT_REW); 50319Sbill } 51319Sbill 52319Sbill htstrategy(io, func) 533262Swnj register struct iob *io; 543262Swnj int func; 55319Sbill { 563262Swnj register int den, errcnt, ds; 57319Sbill short fc; 583262Swnj register struct htdevice *htaddr = 593262Swnj (struct htdevice *)mbadrv(io->i_unit); 60319Sbill 61319Sbill errcnt = 0; 62319Sbill retry: 633262Swnj den = HTTC_1600BPI|HTTC_PDP11; 643262Swnj htquiet(htaddr); 65*3349Swnj htaddr->htcs1 = HT_DCLR|HT_GO; 663262Swnj htaddr->httc = den; 673262Swnj htaddr->htfc = -io->i_cc; 683262Swnj if (func == HT_SREV) { 693262Swnj htaddr->htfc = -1; 703262Swnj htaddr->htcs1 = HT_SREV|HT_GO; 713262Swnj return (0); 72319Sbill } 733274Swnj if (func == READ || func == WRITE) 743262Swnj mbastart(io, func); 75319Sbill else 763262Swnj htaddr->htcs1 = func|HT_GO; 773262Swnj htquiet(htaddr); 783262Swnj ds = htaddr->htds; 793262Swnj if (ds & HTDS_TM) { 803262Swnj htaddr->htcs1 = HT_DCLR|HT_GO; 813262Swnj return (0); 82319Sbill } 833262Swnj if (ds & HTDS_ERR) { 84*3349Swnj printf("ht error: ds=%b, er=%b\n", 85*3349Swnj MASKREG(htaddr->htds), HTDS_BITS, 86*3349Swnj MASKREG(htaddr->hter), HTER_BITS); 873262Swnj htaddr->htcs1 = HT_DCLR|HT_GO; 88319Sbill if (errcnt == 10) { 89*3349Swnj printf("ht: unrecovered error\n"); 903262Swnj return (-1); 91319Sbill } 92319Sbill errcnt++; 933262Swnj htstrategy(io, HT_SREV); 94319Sbill goto retry; 95319Sbill } 96319Sbill if (errcnt) 97*3349Swnj printf("ht: recovered by retry\n"); 983262Swnj fc = htaddr->htfc; 993262Swnj return (io->i_cc+fc); 100319Sbill } 101319Sbill 1023262Swnj htquiet(htaddr) 1033262Swnj register struct htdevice *htaddr; 104319Sbill { 105319Sbill register int s; 106319Sbill 107319Sbill do 1083262Swnj s = htaddr->htds; 1093262Swnj while ((s & HTDS_DRY) == 0); 110319Sbill } 111