/* $NecBSD: tmc18c30.c,v 1.28.12.3 2001/06/19 04:35:48 honda Exp $ */ /* $NetBSD$ */ #define STG_DEBUG #define STG_STATICS #define STG_IO_CONTROL_FLAGS (STG_FIFO_INTERRUPTS | STG_WAIT_FOR_SELECT) /*- * SPDX-License-Identifier: BSD-3-Clause * * [NetBSD for NEC PC-98 series] * Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001 * NetBSD/pc98 porting staff. All rights reserved. * Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001 * Naofumi HONDA. All rights reserved. * Copyright (c) 1996, 1997, 1998, 1999 * Kouichi Matsuda. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include /*************************************************** * USER SETTINGS ***************************************************/ /* DEVICE CONFIGURATION FLAGS (MINOR) * * 0x01 DISCONNECT OFF * 0x02 PARITY LINE OFF * 0x04 IDENTIFY MSG OFF ( = single lun) * 0x08 SYNC TRANSFER OFF */ /* #define STG_SYNC_SUPPORT */ /* NOT YET but easy */ /* For the 512 fifo type: change below */ #define TMC18C30_FIFOSZ 0x800 #define TMC18C30_FCBSZ 0x200 #define TMC18C50_FIFOSZ 0x2000 #define TMC18C50_FCBSZ 0x400 #define STG_MAX_DATA_SIZE (64 * 1024) #define STG_DELAY_MAX (2 * 1000 * 1000) #define STG_DELAY_INTERVAL (1) #define STG_DELAY_SELECT_POLLING_MAX (5 * 1000 * 1000) /*************************************************** * PARAMS ***************************************************/ #define STG_NTARGETS 8 #define STG_NLUNS 8 /*************************************************** * DEBUG ***************************************************/ #ifdef STG_DEBUG static int stg_debug; #endif /* STG_DEBUG */ #ifdef STG_STATICS static struct stg_statics { int arbit_fail_0; int arbit_fail_1; int disconnect; int reselect; } stg_statics; #endif /* STG_STATICS */ /*************************************************** * IO control flags ***************************************************/ #define STG_FIFO_INTERRUPTS 0x0001 #define STG_WAIT_FOR_SELECT 0x0100 int stg_io_control = STG_IO_CONTROL_FLAGS; /*************************************************** * DEVICE STRUCTURE ***************************************************/ extern struct cfdriver stg_cd; /************************************************************** * DECLARE **************************************************************/ /* static */ static void stg_pio_read(struct stg_softc *, struct targ_info *, u_int); static void stg_pio_write(struct stg_softc *, struct targ_info *, u_int); static int stg_xfer(struct stg_softc *, u_int8_t *, int, int, int); static int stg_msg(struct stg_softc *, struct targ_info *, u_int); static int stg_reselected(struct stg_softc *); static int stg_disconnected(struct stg_softc *, struct targ_info *); static __inline void stg_pdma_end(struct stg_softc *, struct targ_info *); static int stghw_select_targ_wait(struct stg_softc *, int); static int stghw_check(struct stg_softc *); static void stghw_init(struct stg_softc *); static int stg_negate_signal(struct stg_softc *, u_int8_t, u_char *); static int stg_expect_signal(struct stg_softc *, u_int8_t, u_int8_t); static int stg_world_start(struct stg_softc *, int); static int stghw_start_selection(struct stg_softc *sc, struct slccb *); static void stghw_bus_reset(struct stg_softc *); static void stghw_attention(struct stg_softc *); static int stg_target_nexus_establish(struct stg_softc *); static int stg_lun_nexus_establish(struct stg_softc *); static int stg_ccb_nexus_establish(struct stg_softc *); static int stg_targ_init(struct stg_softc *, struct targ_info *, int); static __inline void stghw_bcr_write_1(struct stg_softc *, u_int8_t); static int stg_timeout(struct stg_softc *); static void stg_selection_done_and_expect_msgout(struct stg_softc *); struct scsi_low_funcs stgfuncs = { SC_LOW_INIT_T stg_world_start, SC_LOW_BUSRST_T stghw_bus_reset, SC_LOW_TARG_INIT_T stg_targ_init, SC_LOW_LUN_INIT_T NULL, SC_LOW_SELECT_T stghw_start_selection, SC_LOW_NEXUS_T stg_lun_nexus_establish, SC_LOW_NEXUS_T stg_ccb_nexus_establish, SC_LOW_ATTEN_T stghw_attention, SC_LOW_MSG_T stg_msg, SC_LOW_TIMEOUT_T stg_timeout, SC_LOW_POLL_T stgintr, NULL, }; /**************************************************** * hwfuncs ****************************************************/ static __inline void stghw_bcr_write_1(struct stg_softc *sc, u_int8_t bcv) { bus_write_1(sc->port_res, tmc_bctl, bcv); sc->sc_busimg = bcv; } static int stghw_check(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; u_int fcbsize, fcb; u_int16_t lsb, msb; lsb = bus_read_1(sc->port_res, tmc_idlsb); msb = bus_read_1(sc->port_res, tmc_idmsb); switch (msb << 8 | lsb) { case 0x6127: /* TMCCHIP_1800 not supported. (it's my policy) */ sc->sc_chip = TMCCHIP_1800; return EINVAL; case 0x60e9: if (bus_read_1(sc->port_res, tmc_cfg2) & 0x02) { sc->sc_chip = TMCCHIP_18C30; sc->sc_fsz = TMC18C30_FIFOSZ; fcbsize = TMC18C30_FCBSZ; } else { sc->sc_chip = TMCCHIP_18C50; sc->sc_fsz = TMC18C50_FIFOSZ; fcbsize = TMC18C50_FCBSZ; } break; default: sc->sc_chip = TMCCHIP_UNK; return ENODEV; } sc->sc_fcRinit = FCTL_INTEN; sc->sc_fcWinit = FCTL_PARENB | FCTL_INTEN; if (slp->sl_cfgflags & CFG_NOATTEN) sc->sc_imsg = 0; else sc->sc_imsg = BCTL_ATN; sc->sc_busc = BCTL_BUSEN; sc->sc_wthold = fcbsize + 256; sc->sc_rthold = fcbsize - 256; sc->sc_maxwsize = sc->sc_fsz; fcb = fcbsize / (sc->sc_fsz / 16); sc->sc_icinit = ICTL_CD | ICTL_SEL | ICTL_ARBIT | fcb; return 0; } static void stghw_init(sc) struct stg_softc *sc; { bus_write_1(sc->port_res, tmc_ictl, 0); stghw_bcr_write_1(sc, BCTL_BUSFREE); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO | FCTL_CLRINT); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); bus_write_1(sc->port_res, tmc_ssctl, 0); } static int stg_targ_init(sc, ti, action) struct stg_softc *sc; struct targ_info *ti; int action; { struct stg_targ_info *sti = (void *) ti; if (action == SCSI_LOW_INFO_ALLOC || action == SCSI_LOW_INFO_REVOKE) { ti->ti_width = SCSI_LOW_BUS_WIDTH_8; ti->ti_maxsynch.period = 0; ti->ti_maxsynch.offset = 0; sti->sti_reg_synch = 0; } return 0; } /**************************************************** * scsi low interface ****************************************************/ static void stghw_attention(sc) struct stg_softc *sc; { sc->sc_busc |= BCTL_ATN; sc->sc_busimg |= BCTL_ATN; bus_write_1(sc->port_res, tmc_bctl, sc->sc_busimg); DELAY(10); } static void stghw_bus_reset(sc) struct stg_softc *sc; { bus_write_1(sc->port_res, tmc_ictl, 0); bus_write_1(sc->port_res, tmc_fctl, 0); stghw_bcr_write_1(sc, BCTL_RST); DELAY(100000); stghw_bcr_write_1(sc, BCTL_BUSFREE); } static int stghw_start_selection(sc, cb) struct stg_softc *sc; struct slccb *cb; { struct targ_info *ti = cb->ti; register u_int8_t stat; sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000; sc->sc_dataout_timeout = 0; sc->sc_ubf_timeout = 0; stghw_bcr_write_1(sc, BCTL_BUSFREE); bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); stat = bus_read_1(sc->port_res, tmc_astat); if ((stat & ASTAT_INT) != 0) { return SCSI_LOW_START_FAIL; } bus_write_1(sc->port_res, tmc_scsiid, sc->sc_idbit); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_ARBIT); SCSI_LOW_SETUP_PHASE(ti, PH_ARBSTART); return SCSI_LOW_START_OK; } static int stg_world_start(sc, fdone) struct stg_softc *sc; int fdone; { struct scsi_low_softc *slp = &sc->sc_sclow; int error; if ((slp->sl_cfgflags & CFG_NOPARITY) == 0) sc->sc_fcRinit |= FCTL_PARENB; else sc->sc_fcRinit &= ~FCTL_PARENB; if ((error = stghw_check(sc)) != 0) return error; stghw_init(sc); scsi_low_bus_reset(slp); stghw_init(sc); return 0; } static int stg_msg(sc, ti, msg) struct stg_softc *sc; struct targ_info *ti; u_int msg; { struct stg_targ_info *sti = (void *) ti; u_int period, offset; if ((msg & SCSI_LOW_MSG_WIDE) != 0) { if (ti->ti_width != SCSI_LOW_BUS_WIDTH_8) { ti->ti_width = SCSI_LOW_BUS_WIDTH_8; return EINVAL; } return 0; } if ((msg & SCSI_LOW_MSG_SYNCH) == 0) return 0; period = ti->ti_maxsynch.period; offset = ti->ti_maxsynch.offset; period = period << 2; if (period >= 200) { sti->sti_reg_synch = (period - 200) / 50; if (period % 50) sti->sti_reg_synch ++; sti->sti_reg_synch |= SSCTL_SYNCHEN; } else if (period >= 100) { sti->sti_reg_synch = (period - 100) / 50; if (period % 50) sti->sti_reg_synch ++; sti->sti_reg_synch |= SSCTL_SYNCHEN | SSCTL_FSYNCHEN; } bus_write_1(sc->port_res, tmc_ssctl, sti->sti_reg_synch); return 0; } /************************************************************** * General probe attach **************************************************************/ int stgprobesubr(struct resource *res, u_int dvcfg) { u_int16_t lsb, msb; lsb = bus_read_1(res, tmc_idlsb); msb = bus_read_1(res, tmc_idmsb); switch (msb << 8 | lsb) { default: return 0; case 0x6127: /* not support! */ return 0; case 0x60e9: return 1; } return 0; } void stgattachsubr(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; printf("\n"); sc->sc_idbit = (1 << slp->sl_hostid); slp->sl_funcs = &stgfuncs; sc->sc_tmaxcnt = SCSI_LOW_MIN_TOUT * 1000 * 1000; /* default */ slp->sl_flags |= HW_READ_PADDING; slp->sl_cfgflags |= CFG_ASYNC; /* XXX */ (void) scsi_low_attach(slp, 0, STG_NTARGETS, STG_NLUNS, sizeof(struct stg_targ_info), 0); gone_in(12, "stg(4) driver"); } /************************************************************** * PDMA functions **************************************************************/ static __inline void stg_pdma_end(sc, ti) struct stg_softc *sc; struct targ_info *ti; { struct scsi_low_softc *slp = &sc->sc_sclow; struct slccb *cb = slp->sl_Qnexus; u_int len, tres; slp->sl_flags &= ~HW_PDMASTART; sc->sc_icinit &= ~ICTL_FIFO; sc->sc_dataout_timeout = 0; if (cb == NULL) { slp->sl_error |= PDMAERR; goto out; } if (ti->ti_phase == PH_DATA) { len = bus_read_2(sc->port_res, tmc_fdcnt); if (slp->sl_scp.scp_direction == SCSI_LOW_WRITE) { if (len != 0) { tres = len + slp->sl_scp.scp_datalen; if (tres <= (u_int) cb->ccb_scp.scp_datalen) { slp->sl_scp.scp_data -= len; slp->sl_scp.scp_datalen = tres; } else { slp->sl_error |= PDMAERR; device_printf(slp->sl_dev, "len %x >= datalen %x\n", len, slp->sl_scp.scp_datalen); } } } else if (slp->sl_scp.scp_direction == SCSI_LOW_READ) { if (len != 0) { slp->sl_error |= PDMAERR; device_printf(slp->sl_dev, "len %x left in fifo\n", len); } } scsi_low_data_finish(slp); } else { device_printf(slp->sl_dev, "data phase miss\n"); slp->sl_error |= PDMAERR; } out: bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); } static void stg_pio_read(sc, ti, thold) struct stg_softc *sc; struct targ_info *ti; u_int thold; { struct scsi_low_softc *slp = &sc->sc_sclow; struct sc_p *sp = &slp->sl_scp; int tout; u_int res; u_int8_t stat; if ((slp->sl_flags & HW_PDMASTART) == 0) { bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_FIFOEN); slp->sl_flags |= HW_PDMASTART; } tout = sc->sc_tmaxcnt; while (tout -- > 0) { if (thold > 0) { res = bus_read_2(sc->port_res, tmc_fdcnt); if (res < thold) { bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); break; } } else { stat = bus_read_1(sc->port_res, tmc_bstat); res = bus_read_2(sc->port_res, tmc_fdcnt); if (res == 0) { if ((stat & PHASE_MASK) != DATA_IN_PHASE) break; if (sp->scp_datalen <= 0) break; DELAY(1); continue; } } /* The assumtion res != 0 is valid here */ if (res > sp->scp_datalen) { if (res == (u_int) -1) break; slp->sl_error |= PDMAERR; if ((slp->sl_flags & HW_READ_PADDING) == 0) { device_printf(slp->sl_dev, "read padding required\n"); break; } sp->scp_datalen = 0; if (res > STG_MAX_DATA_SIZE) res = STG_MAX_DATA_SIZE; while (res -- > 0) { (void) bus_read_1(sc->port_res, tmc_rfifo); } continue; } sp->scp_datalen -= res; if (res & 1) { *sp->scp_data = bus_read_1(sc->port_res, tmc_rfifo); sp->scp_data ++; res --; } bus_read_multi_2(sc->port_res, tmc_rfifo, (u_int16_t *) sp->scp_data, res >> 1); sp->scp_data += res; } if (tout <= 0) device_printf(slp->sl_dev, "pio read timeout\n"); } static void stg_pio_write(sc, ti, thold) struct stg_softc *sc; struct targ_info *ti; u_int thold; { struct scsi_low_softc *slp = &sc->sc_sclow; struct sc_p *sp = &slp->sl_scp; u_int res; int tout; register u_int8_t stat; if ((slp->sl_flags & HW_PDMASTART) == 0) { stat = sc->sc_fcWinit | FCTL_FIFOEN | FCTL_FIFOW; bus_write_1(sc->port_res, tmc_fctl, stat | FCTL_CLRFIFO); bus_write_1(sc->port_res, tmc_fctl, stat); slp->sl_flags |= HW_PDMASTART; } tout = sc->sc_tmaxcnt; while (tout -- > 0) { stat = bus_read_1(sc->port_res, tmc_bstat); if ((stat & PHASE_MASK) != DATA_OUT_PHASE) break; if (sp->scp_datalen <= 0) { if (sc->sc_dataout_timeout == 0) sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ; break; } if (thold > 0) { res = bus_read_2(sc->port_res, tmc_fdcnt); if (res > thold) { bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); break; } } else { res = bus_read_2(sc->port_res, tmc_fdcnt); if (res > sc->sc_maxwsize / 2) { DELAY(1); continue; } } if (res == (u_int) -1) break; res = sc->sc_maxwsize - res; if (res > sp->scp_datalen) res = sp->scp_datalen; sp->scp_datalen -= res; if ((res & 0x1) != 0) { bus_write_1(sc->port_res, tmc_wfifo, *sp->scp_data); sp->scp_data ++; res --; } bus_write_multi_2(sc->port_res, tmc_wfifo, (u_int16_t *) sp->scp_data, res >> 1); sp->scp_data += res; } if (tout <= 0) device_printf(slp->sl_dev, "pio write timeout\n"); } static int stg_negate_signal(struct stg_softc *sc, u_int8_t mask, u_char *s) { struct scsi_low_softc *slp = &sc->sc_sclow; int wc; u_int8_t regv; for (wc = 0; wc < STG_DELAY_MAX / STG_DELAY_INTERVAL; wc ++) { regv = bus_read_1(sc->port_res, tmc_bstat); if (regv == (u_int8_t) -1) return -1; if ((regv & mask) == 0) return 1; DELAY(STG_DELAY_INTERVAL); } device_printf(slp->sl_dev, "%s stg_negate_signal timeout\n", s); return -1; } static int stg_expect_signal(struct stg_softc *sc, u_int8_t phase, u_int8_t mask) { struct scsi_low_softc *slp = &sc->sc_sclow; int wc; u_int8_t ph; phase &= PHASE_MASK; for (wc = 0; wc < STG_DELAY_MAX / STG_DELAY_INTERVAL; wc ++) { ph = bus_read_1(sc->port_res, tmc_bstat); if (ph == (u_int8_t) -1) return -1; if ((ph & PHASE_MASK) != phase) return 0; if ((ph & mask) != 0) return 1; DELAY(STG_DELAY_INTERVAL); } device_printf(slp->sl_dev, "stg_expect_signal timeout\n"); return -1; } static int stg_xfer(sc, buf, len, phase, clear_atn) struct stg_softc *sc; u_int8_t *buf; int len; int phase; int clear_atn; { int rv, ptr; if (phase & BSTAT_IO) bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); else bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcWinit); for (ptr = 0; len > 0; len --) { rv = stg_expect_signal(sc, phase, BSTAT_REQ); if (rv <= 0) goto bad; if (len == 1 && clear_atn != 0) { sc->sc_busc &= ~BCTL_ATN; stghw_bcr_write_1(sc, sc->sc_busc); SCSI_LOW_DEASSERT_ATN(&sc->sc_sclow); } if (phase & BSTAT_IO) { buf[ptr ++] = bus_read_1(sc->port_res, tmc_rdata); } else { bus_write_1(sc->port_res, tmc_wdata, buf[ptr ++]); } stg_negate_signal(sc, BSTAT_ACK, "xfer"); } bad: bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); return len; } /************************************************************** * disconnect & reselect (HW low) **************************************************************/ static int stg_reselected(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; int tout; u_int sid; u_int8_t regv; if (slp->sl_selid != NULL) { /* XXX: * Selection vs Reselection conflicts. */ bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, BCTL_BUSFREE); } else if (slp->sl_Tnexus != NULL) { device_printf(slp->sl_dev, "unexpected termination\n"); stg_disconnected(sc, slp->sl_Tnexus); } /* XXX: * We should ack the reselection as soon as possible, * because the target would abort the current reselection seq * due to reselection timeout. */ tout = STG_DELAY_SELECT_POLLING_MAX; while (tout -- > 0) { regv = bus_read_1(sc->port_res, tmc_bstat); if ((regv & (BSTAT_IO | BSTAT_SEL | BSTAT_BSY)) == (BSTAT_IO | BSTAT_SEL)) { DELAY(1); regv = bus_read_1(sc->port_res, tmc_bstat); if ((regv & (BSTAT_IO | BSTAT_SEL | BSTAT_BSY)) == (BSTAT_IO | BSTAT_SEL)) goto reselect_start; } DELAY(1); } device_printf(slp->sl_dev, "reselction timeout I\n"); return EJUSTRETURN; reselect_start: sid = (u_int) bus_read_1(sc->port_res, tmc_scsiid); if ((sid & sc->sc_idbit) == 0) { /* not us */ return EJUSTRETURN; } bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO | FCTL_CLRINT); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, sc->sc_busc | BCTL_BSY); while (tout -- > 0) { regv = bus_read_1(sc->port_res, tmc_bstat); if ((regv & (BSTAT_SEL | BSTAT_BSY)) == BSTAT_BSY) goto reselected; DELAY(1); } device_printf(slp->sl_dev, "reselction timeout II\n"); return EJUSTRETURN; reselected: sid &= ~sc->sc_idbit; sid = ffs(sid) - 1; if (scsi_low_reselected(slp, sid) == NULL) return EJUSTRETURN; #ifdef STG_STATICS stg_statics.reselect ++; #endif /* STG_STATICS */ return EJUSTRETURN; } static int stg_disconnected(sc, ti) struct stg_softc *sc; struct targ_info *ti; { struct scsi_low_softc *slp = &sc->sc_sclow; /* clear bus status & fifo */ bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, BCTL_BUSFREE); sc->sc_icinit &= ~ICTL_FIFO; sc->sc_busc &= ~BCTL_ATN; sc->sc_dataout_timeout = 0; sc->sc_ubf_timeout = 0; #ifdef STG_STATICS stg_statics.disconnect ++; #endif /* STG_STATICS */ scsi_low_disconnected(slp, ti); return 1; } /************************************************************** * SEQUENCER **************************************************************/ static int stg_target_nexus_establish(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; struct targ_info *ti = slp->sl_Tnexus; struct stg_targ_info *sti = (void *) ti; bus_write_1(sc->port_res, tmc_ssctl, sti->sti_reg_synch); if ((stg_io_control & STG_FIFO_INTERRUPTS) != 0) { sc->sc_icinit |= ICTL_FIFO; } return 0; } static int stg_lun_nexus_establish(sc) struct stg_softc *sc; { return 0; } static int stg_ccb_nexus_establish(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; struct slccb *cb = slp->sl_Qnexus; sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000; return 0; } #define STGHW_SELECT_INTERVAL 10 static int stghw_select_targ_wait(sc, mu) struct stg_softc *sc; int mu; { mu = mu / STGHW_SELECT_INTERVAL; while (mu -- > 0) { if ((bus_read_1(sc->port_res, tmc_bstat) & BSTAT_BSY) == 0) { DELAY(STGHW_SELECT_INTERVAL); continue; } DELAY(1); if ((bus_read_1(sc->port_res, tmc_bstat) & BSTAT_BSY) != 0) { return 0; } } return ENXIO; } static void stg_selection_done_and_expect_msgout(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, sc->sc_imsg | sc->sc_busc); SCSI_LOW_ASSERT_ATN(slp); } int stgintr(arg) void *arg; { struct stg_softc *sc = arg; struct scsi_low_softc *slp = &sc->sc_sclow; struct targ_info *ti; struct buf *bp; u_int derror, flags; int len; u_int8_t status, astatus, regv; /******************************************* * interrupt check *******************************************/ if (slp->sl_flags & HW_INACTIVE) return 0; astatus = bus_read_1(sc->port_res, tmc_astat); status = bus_read_1(sc->port_res, tmc_bstat); if ((astatus & ASTAT_STATMASK) == 0 || astatus == (u_int8_t) -1) return 0; bus_write_1(sc->port_res, tmc_ictl, 0); if (astatus & ASTAT_SCSIRST) { bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); bus_write_1(sc->port_res, tmc_ictl, 0); scsi_low_restart(slp, SCSI_LOW_RESTART_SOFT, "bus reset (power off?)"); return 1; } /******************************************* * debug section *******************************************/ #ifdef STG_DEBUG if (stg_debug) { scsi_low_print(slp, NULL); device_printf(slp->sl_dev, "st %x ist %x\n\n", status, astatus); #ifdef KDB if (stg_debug > 1) kdb_enter(KDB_WHY_CAM, "stg"); #endif /* KDB */ } #endif /* STG_DEBUG */ /******************************************* * reselection & nexus *******************************************/ if ((status & RESEL_PHASE_MASK)== PHASE_RESELECTED) { if (stg_reselected(sc) == EJUSTRETURN) goto out; } if ((ti = slp->sl_Tnexus) == NULL) return 0; derror = 0; if ((astatus & ASTAT_PARERR) != 0 && ti->ti_phase != PH_ARBSTART && (sc->sc_fcRinit & FCTL_PARENB) != 0) { slp->sl_error |= PARITYERR; derror = SCSI_LOW_DATA_PE; if ((status & PHASE_MASK) == MESSAGE_IN_PHASE) scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_PARITY, 0); else scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ERROR, 1); } /******************************************* * aribitration & selection *******************************************/ switch (ti->ti_phase) { case PH_ARBSTART: if ((astatus & ASTAT_ARBIT) == 0) { #ifdef STG_STATICS stg_statics.arbit_fail_0 ++; #endif /* STG_STATICS */ goto arb_fail; } status = bus_read_1(sc->port_res, tmc_bstat); if ((status & BSTAT_IO) != 0) { /* XXX: * Selection vs Reselection conflicts. */ #ifdef STG_STATICS stg_statics.arbit_fail_1 ++; #endif /* STG_STATICS */ arb_fail: bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, BCTL_BUSFREE); scsi_low_arbit_fail(slp, slp->sl_Qnexus); goto out; } /* * selection assert start. */ SCSI_LOW_SETUP_PHASE(ti, PH_SELSTART); scsi_low_arbit_win(slp); bus_write_1(sc->port_res, tmc_scsiid, sc->sc_idbit | (1 << ti->ti_id)); stghw_bcr_write_1(sc, sc->sc_imsg | sc->sc_busc | BCTL_SEL); bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcWinit); if ((stg_io_control & STG_WAIT_FOR_SELECT) != 0) { /* selection abort delay 200 + 100 micro sec */ if (stghw_select_targ_wait(sc, 300) == 0) { SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED); stg_selection_done_and_expect_msgout(sc); } } goto out; case PH_SELSTART: if ((status & BSTAT_BSY) == 0) { /* selection timeout delay 250 ms */ if (stghw_select_targ_wait(sc, 250 * 1000) != 0) { stg_disconnected(sc, ti); goto out; } } SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED); stg_selection_done_and_expect_msgout(sc); goto out; case PH_SELECTED: if ((status & BSTAT_REQ) == 0) goto out; stg_target_nexus_establish(sc); break; case PH_RESEL: if ((status & BSTAT_REQ) == 0) goto out; /* clear a busy line */ bus_write_1(sc->port_res, tmc_fctl, sc->sc_fcRinit); stghw_bcr_write_1(sc, sc->sc_busc); stg_target_nexus_establish(sc); if ((status & PHASE_MASK) != MESSAGE_IN_PHASE) { device_printf(slp->sl_dev, "unexpected phase after reselect\n"); slp->sl_error |= FATALIO; scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ABORT, 1); goto out; } break; } /******************************************* * data phase *******************************************/ if ((slp->sl_flags & HW_PDMASTART) && STG_IS_PHASE_DATA(status) == 0) { if (slp->sl_scp.scp_direction == SCSI_LOW_READ) stg_pio_read(sc, ti, 0); stg_pdma_end(sc, ti); } /******************************************* * scsi seq *******************************************/ switch (status & PHASE_MASK) { case COMMAND_PHASE: if (stg_expect_signal(sc, COMMAND_PHASE, BSTAT_REQ) <= 0) break; SCSI_LOW_SETUP_PHASE(ti, PH_CMD); if (scsi_low_cmd(slp, ti) != 0) { scsi_low_attention(slp); } if (stg_xfer(sc, slp->sl_scp.scp_cmd, slp->sl_scp.scp_cmdlen, COMMAND_PHASE, 0) != 0) { device_printf(slp->sl_dev, "CMDOUT short\n"); } break; case DATA_OUT_PHASE: SCSI_LOW_SETUP_PHASE(ti, PH_DATA); if (scsi_low_data(slp, ti, &bp, SCSI_LOW_WRITE) != 0) { scsi_low_attention(slp); } if ((sc->sc_icinit & ICTL_FIFO) != 0) stg_pio_write(sc, ti, sc->sc_wthold); else stg_pio_write(sc, ti, 0); break; case DATA_IN_PHASE: SCSI_LOW_SETUP_PHASE(ti, PH_DATA); if (scsi_low_data(slp, ti, &bp, SCSI_LOW_READ) != 0) { scsi_low_attention(slp); } if ((sc->sc_icinit & ICTL_FIFO) != 0) stg_pio_read(sc, ti, sc->sc_rthold); else stg_pio_read(sc, ti, 0); break; case STATUS_PHASE: regv = stg_expect_signal(sc, STATUS_PHASE, BSTAT_REQ); if (regv <= 0) break; SCSI_LOW_SETUP_PHASE(ti, PH_STAT); regv = bus_read_1(sc->port_res, tmc_sdna); if (scsi_low_statusin(slp, ti, regv | derror) != 0) { scsi_low_attention(slp); } if (regv != bus_read_1(sc->port_res, tmc_rdata)) { device_printf(slp->sl_dev, "STATIN: data mismatch\n"); } stg_negate_signal(sc, BSTAT_ACK, "statin"); break; case MESSAGE_OUT_PHASE: if (stg_expect_signal(sc, MESSAGE_OUT_PHASE, BSTAT_REQ) <= 0) break; SCSI_LOW_SETUP_PHASE(ti, PH_MSGOUT); flags = (ti->ti_ophase != ti->ti_phase) ? SCSI_LOW_MSGOUT_INIT : 0; len = scsi_low_msgout(slp, ti, flags); if (len > 1 && slp->sl_atten == 0) { scsi_low_attention(slp); } if (stg_xfer(sc, ti->ti_msgoutstr, len, MESSAGE_OUT_PHASE, slp->sl_clear_atten) != 0) { device_printf(slp->sl_dev, "MSGOUT short\n"); } else { if (slp->sl_msgphase >= MSGPH_ABORT) { stg_disconnected(sc, ti); } } break; case MESSAGE_IN_PHASE: /* confirm phase and req signal */ if (stg_expect_signal(sc, MESSAGE_IN_PHASE, BSTAT_REQ) <= 0) break; SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN); /* read data with NOACK */ regv = bus_read_1(sc->port_res, tmc_sdna); if (scsi_low_msgin(slp, ti, derror | regv) == 0) { if (scsi_low_is_msgout_continue(ti, 0) != 0) { scsi_low_attention(slp); } } /* read data with ACK */ if (regv != bus_read_1(sc->port_res, tmc_rdata)) { device_printf(slp->sl_dev, "MSGIN: data mismatch\n"); } /* wait for the ack negated */ stg_negate_signal(sc, BSTAT_ACK, "msgin"); if (slp->sl_msgphase != 0 && slp->sl_msgphase < MSGPH_ABORT) { stg_disconnected(sc, ti); } break; case BUSFREE_PHASE: device_printf(slp->sl_dev, "unexpected disconnect\n"); stg_disconnected(sc, ti); break; default: slp->sl_error |= FATALIO; device_printf(slp->sl_dev, "unknown phase bus %x intr %x\n", status, astatus); break; } out: bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); return 1; } static int stg_timeout(sc) struct stg_softc *sc; { struct scsi_low_softc *slp = &sc->sc_sclow; int tout, count; u_int8_t status; if (slp->sl_Tnexus == NULL) return 0; status = bus_read_1(sc->port_res, tmc_bstat); if ((status & PHASE_MASK) == 0) { if (sc->sc_ubf_timeout ++ == 0) return 0; device_printf(slp->sl_dev, "unexpected bus free detected\n"); slp->sl_error |= FATALIO; scsi_low_print(slp, slp->sl_Tnexus); stg_disconnected(sc, slp->sl_Tnexus); return 0; } switch (status & PHASE_MASK) { case DATA_OUT_PHASE: if (sc->sc_dataout_timeout == 0) break; if ((status & BSTAT_REQ) == 0) break; if (bus_read_2(sc->port_res, tmc_fdcnt) != 0) break; if ((-- sc->sc_dataout_timeout) > 0) break; slp->sl_error |= PDMAERR; if ((slp->sl_flags & HW_WRITE_PADDING) == 0) { device_printf(slp->sl_dev, "write padding required\n"); break; } bus_write_1(sc->port_res, tmc_ictl, 0); tout = STG_DELAY_MAX; while (tout --) { status = bus_read_1(sc->port_res, tmc_bstat); if ((status & PHASE_MASK) != DATA_OUT_PHASE) break; if (bus_read_2(sc->port_res, tmc_fdcnt) != 0) { DELAY(1); continue; } for (count = sc->sc_maxwsize; count > 0; count --) bus_write_1(sc->port_res, tmc_wfifo, 0); } status = bus_read_1(sc->port_res, tmc_bstat); if ((status & PHASE_MASK) == DATA_OUT_PHASE) sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ; bus_write_1(sc->port_res, tmc_ictl, sc->sc_icinit); break; default: break; } return 0; }