diff options
Diffstat (limited to 'sys/dev/tc/asc.c')
| -rw-r--r-- | sys/dev/tc/asc.c | 77 |
1 files changed, 67 insertions, 10 deletions
diff --git a/sys/dev/tc/asc.c b/sys/dev/tc/asc.c index 714a41e4f39..7246a421457 100644 --- a/sys/dev/tc/asc.c +++ b/sys/dev/tc/asc.c @@ -1,3 +1,4 @@ +/* $OpenBSD: asc.c,v 1.13 1997/07/08 05:29:11 mhitch Exp $ */ /* $NetBSD: asc.c,v 1.31 1996/10/13 01:38:35 christos Exp $ */ /*- @@ -972,12 +973,41 @@ again: readback(regs->asc_cmd); goto done; + case SCSI_PHASE_COMMAND: + /* + * This seems to occur after the command is sent + * following sync negotiation. The device still + * wants more command data. The fifo appears to + * to still have the unsent data - but the 53C94 + * signaled TC. If the fifo still contains data, + * transfer it, otherwise do a transfer pad. The + * target should then continue through the rest of + * the phases and complete normally. + */ + printf("asc_intr: tgt %d command phase TC zero", + asc->target); + if ((regs->asc_flags & ASC_FLAGS_FIFO_CNT) != 0) { + printf(" with non-empty fifo %d\n", + regs->asc_flags & ASC_FLAGS_FIFO_CNT); + regs->asc_cmd = ASC_CMD_XFER_INFO; + } else { + printf("; padding command\n"); + ASC_TC_PUT(regs, 0xff); + regs->asc_cmd = ASC_CMD_XFER_PAD | ASC_CMD_DMA; + } + goto done; + default: + printf("asc_intr: target %d, unknown phase 0x%x\n", + asc->target, status); goto abort; } - if (state->script) + if (state->script) { + printf("asc_intr: target %d, incomplete script %p\n", + asc->target, state->script); goto abort; + } /* check for DMA in progress */ ASC_TC_GET(regs, len); @@ -1187,8 +1217,12 @@ again: unsigned fifo, id, msg; fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; - if (fifo < 2) + if (fifo < 2) { + printf("asc_intr: target %d, reselect, fifo %d too small for msg\n", + asc->target, fifo); + goto abort; + } /* read unencoded SCSI ID and convert to binary */ msg = regs->asc_fifo & asc->myidmask; for (id = 0; (msg & 1) == 0; id++) @@ -1206,8 +1240,11 @@ again: state = &asc->st[id]; asc->script = state->script; state->script = (script_t *)0; - if (!(state->flags & DISCONN)) + if (!(state->flags & DISCONN)) { + printf("asc_intr: reselect tgt %d, flags 0x%x not disconnected\n", + asc->target, state->flags); goto abort; + } state->flags &= ~DISCONN; regs->asc_syn_p = state->sync_period; regs->asc_syn_o = state->sync_offset; @@ -1217,9 +1254,10 @@ again: } /* check if we are being selected as a target */ - if (ir & (ASC_INT_SEL | ASC_INT_SEL_ATN)) + if (ir & (ASC_INT_SEL | ASC_INT_SEL_ATN)) { + printf("asc_intr: host adaptor selected as target\n"); goto abort; - + } /* * 'ir' must be just ASC_INT_FC. * This is normal if canceling an ASC_ENABLE_SEL. @@ -1863,8 +1901,11 @@ asc_msg_in(asc, status, ss, ir) state->msglen = msg; return (1); } - if (state->msgcnt >= state->msglen) + if (state->msgcnt >= state->msglen) { + printf("asc: msg_in too big, msgcnt %d msglen %d\n", + state->msgcnt, state->msglen); goto abort; + } state->msg_in[state->msgcnt++] = msg; /* did we just read the last byte of the message? */ @@ -1988,8 +2029,11 @@ asc_msg_in(asc, status, ss, ir) break; case SCSI_DISCONNECT: - if (state->flags & DISCONN) + if (state->flags & DISCONN) { + printf("asc: disconnected target %d disconnecting again\n", + asc->target); goto abort; + } state->flags |= DISCONN; regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); @@ -2011,6 +2055,8 @@ done: regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); if (!state->script) { + printf("asc_msg_in: target %d, no script?\n", asc->target); + abort: #ifdef DEBUG asc_DumpLog("asc_msg_in"); @@ -2028,12 +2074,11 @@ asc_disconnect(asc, status, ss, ir) register asc_softc_t asc; register int status, ss, ir; { -#if MACH_DDIAGNOSTIC + int i; +#ifdef DIAGNOSTIC /* later Mach driver checks for late asych disconnect here. */ register State *state = &asc->st[asc->target]; -#endif -#ifdef DIAGNOSTIC if (!(state->flags & DISCONN)) { printf("asc_disconnect: device %d: DISCONN not set!\n", asc->target); @@ -2041,6 +2086,18 @@ asc_disconnect(asc, status, ss, ir) #endif /*DIAGNOSTIC*/ asc->target = -1; asc->state = ASC_STATE_RESEL; + /* + * Look for another device that is ready. + * May want to keep last one started and increment for fairness + * rather than always starting at zero. + */ + for (i = 0; i < ASC_NCMD; i++) { + /* don't restart a disconnected command */ + if (!asc->cmd[i] || asc->st[i].flags & DISCONN) + continue; + asc_startcmd(asc, i); + return (0); + } return (1); } |