diff options
Diffstat (limited to 'sys/dev/ic/ncr5380sbc.c')
| -rw-r--r-- | sys/dev/ic/ncr5380sbc.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/sys/dev/ic/ncr5380sbc.c b/sys/dev/ic/ncr5380sbc.c index eb906185a49..dc22db77a2d 100644 --- a/sys/dev/ic/ncr5380sbc.c +++ b/sys/dev/ic/ncr5380sbc.c @@ -1,4 +1,4 @@ -/* $NetBSD: ncr5380sbc.c,v 1.1 1996/01/01 22:24:37 thorpej Exp $ */ +/* $NetBSD: ncr5380sbc.c,v 1.2 1996/01/23 19:47:00 gwr Exp $ */ /* * Copyright (c) 1995 David Jones, Gordon W. Ross @@ -130,7 +130,7 @@ int Debugger(); #define NCR_DBG_BREAK 1 #define NCR_DBG_CMDS 2 -int ncr5380_debug = NCR_DBG_BREAK; +int ncr5380_debug = 0; #define NCR_BREAK() \ do { if (ncr5380_debug & NCR_DBG_BREAK) Debugger(); } while (0) static void ncr5380_show_scsi_cmd __P((struct scsi_xfer *)); @@ -1071,6 +1071,8 @@ ncr5380_reselect(sc) * then raise SEL, and finally drop BSY. Only then is the * data bus required to have valid selection ID bits set. * Wait for: SEL==1, BSY==0 before reading the data bus. + * While this theoretically can happen, we are aparently + * never fast enough to get here before BSY drops. */ timo = ncr5380_wait_nrq_timo; for (;;) { @@ -1084,7 +1086,7 @@ ncr5380_reselect(sc) ncr5380_reset_scsibus(sc); return; } - delay(10); + delay(2); bus = *(sc->sci_bus_csr); /* If SEL went away, forget it. */ if ((bus & SCI_BUS_SEL) == 0) @@ -1100,7 +1102,7 @@ ncr5380_reselect(sc) */ delay(2); data = *(sc->sci_data) & 0xFF; - /* XXX - Should check parity... */ + /* Parity check is implicit in data validation below. */ /* * Is this a reselect (I/O == 1) or have we been @@ -1290,11 +1292,12 @@ ncr5380_select(sc, sr) * in the output data register and set MODE_ARB. The * 5380 watches for the required "bus free" period. * If and when the "bus free" period is detected, the - * 5380 then drives BSY, drives the data bus, and sets - * the "arbitration in progress" (AIP) bit to let us - * know arbitration has started. We then wait for one - * arbitration delay (2.2uS) and check the ICMD_LST bit, - * which will be set if someone else drives SEL. + * 5380 drives BSY, drives the data bus, and sets the + * "arbitration in progress" (AIP) bit to let us know + * arbitration has started (and that it asserts BSY). + * We then wait for one arbitration delay (2.2uS) and + * check the ICMD_LST bit, which will be set if some + * other target drives SEL during arbitration. */ *(sc->sci_odata) = 0x80; /* OUR_ID */ *(sc->sci_mode) = SCI_MODE_ARB; @@ -2030,7 +2033,7 @@ ncr5380_data_xfer(sc, phase) (sc->sc_datalen >= sc->sc_min_dma_len)) { /* - * OK, really start DMA. Note, the MI start function + * OK, really start DMA. Note, the MD start function * is responsible for setting the TCMD register, etc. * (Acknowledge the phase change there, not here.) */ @@ -2040,14 +2043,17 @@ ncr5380_data_xfer(sc, phase) return ACT_WAIT_DMA; } + /* + * Doing PIO for data transfer. (Possibly "Pseudo DMA") + * XXX: Do PDMA functions need to set tcmd later? + */ NCR_TRACE("data_xfer: doing PIO, len=%d\n", sc->sc_datalen); - /* acknowledge phase change */ - *sc->sci_tcmd = phase; + *sc->sci_tcmd = phase; /* XXX: OK for PDMA? */ if (phase == PHASE_DATA_OUT) { - len = ncr5380_pio_out(sc, phase, sc->sc_datalen, sc->sc_dataptr); + len = (*sc->sc_pio_out)(sc, phase, sc->sc_datalen, sc->sc_dataptr); } else { - len = ncr5380_pio_in (sc, phase, sc->sc_datalen, sc->sc_dataptr); + len = (*sc->sc_pio_in) (sc, phase, sc->sc_datalen, sc->sc_dataptr); } sc->sc_dataptr += len; sc->sc_datalen -= len; |