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tcds.c revision 1.13
      1 /* $NetBSD: tcds.c,v 1.13 2005/02/04 02:10:48 perry Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 /*
     41  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
     42  * All rights reserved.
     43  *
     44  * Author: Keith Bostic, Chris G. Demetriou
     45  *
     46  * Permission to use, copy, modify and distribute this software and
     47  * its documentation is hereby granted, provided that both the copyright
     48  * notice and this permission notice appear in all copies of the
     49  * software, derivative works or modified versions, and any portions
     50  * thereof, and that both notices appear in supporting documentation.
     51  *
     52  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     53  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     54  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     55  *
     56  * Carnegie Mellon requests users of this software to return to
     57  *
     58  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     59  *  School of Computer Science
     60  *  Carnegie Mellon University
     61  *  Pittsburgh PA 15213-3890
     62  *
     63  * any improvements or extensions that they make and grant Carnegie the
     64  * rights to redistribute these changes.
     65  */
     66 
     67 #include <sys/cdefs.h>
     68 __KERNEL_RCSID(0, "$NetBSD: tcds.c,v 1.13 2005/02/04 02:10:48 perry Exp $");
     69 
     70 #include <sys/param.h>
     71 #include <sys/kernel.h>
     72 #include <sys/systm.h>
     73 #include <sys/device.h>
     74 #include <sys/malloc.h>
     75 
     76 #ifdef __alpha__
     77 #include <machine/rpb.h>
     78 #endif /* __alpha__ */
     79 
     80 #include <dev/scsipi/scsi_all.h>
     81 #include <dev/scsipi/scsipi_all.h>
     82 #include <dev/scsipi/scsiconf.h>
     83 
     84 #include <dev/ic/ncr53c9xvar.h>
     85 
     86 #include <machine/bus.h>
     87 
     88 #include <dev/tc/tcvar.h>
     89 #include <dev/tc/tcdsreg.h>
     90 #include <dev/tc/tcdsvar.h>
     91 
     92 #include "locators.h"
     93 
     94 struct tcds_softc {
     95 	struct	device sc_dv;
     96 	bus_space_tag_t sc_bst;
     97 	bus_space_handle_t sc_bsh;
     98 	bus_dma_tag_t sc_dmat;
     99 	void	*sc_cookie;
    100 	int	sc_flags;
    101 	struct tcds_slotconfig sc_slots[2];
    102 };
    103 
    104 /* sc_flags */
    105 #define	TCDSF_BASEBOARD		0x01	/* baseboard on DEC 3000 */
    106 #define	TCDSF_FASTSCSI		0x02	/* supports Fast SCSI */
    107 
    108 /* Definition of the driver for autoconfig. */
    109 int	tcdsmatch(struct device *, struct cfdata *, void *);
    110 void	tcdsattach(struct device *, struct device *, void *);
    111 int     tcdsprint(void *, const char *);
    112 int	tcdssubmatch(struct device *, struct cfdata *,
    113 			  const locdesc_t *, void *);
    114 
    115 CFATTACH_DECL(tcds, sizeof(struct tcds_softc),
    116     tcdsmatch, tcdsattach, NULL, NULL);
    117 
    118 /*static*/ int	tcds_intr(void *);
    119 /*static*/ int	tcds_intrnull(void *);
    120 
    121 struct tcds_device {
    122 	const char *td_name;
    123 	int td_flags;
    124 } tcds_devices[] = {
    125 #ifdef __alpha__
    126 	{ "PMAZ-DS ",	TCDSF_BASEBOARD },
    127 	{ "PMAZ-FS ",	TCDSF_BASEBOARD|TCDSF_FASTSCSI },
    128 #endif /* __alpha__ */
    129 	{ "PMAZB-AA",	0 },
    130 	{ "PMAZC-AA",	TCDSF_FASTSCSI },
    131 	{ NULL,		0 },
    132 };
    133 
    134 struct tcds_device *tcds_lookup(const char *);
    135 void	tcds_params(struct tcds_softc *, int, int *, int *);
    136 
    137 struct tcds_device *
    138 tcds_lookup(modname)
    139 	const char *modname;
    140 {
    141 	struct tcds_device *td;
    142 
    143 	for (td = tcds_devices; td->td_name != NULL; td++)
    144 		if (strncmp(td->td_name, modname, TC_ROM_LLEN) == 0)
    145 			return (td);
    146 
    147 	return (NULL);
    148 }
    149 
    150 int
    151 tcdsmatch(parent, cfdata, aux)
    152 	struct device *parent;
    153 	struct cfdata *cfdata;
    154 	void *aux;
    155 {
    156 	struct tc_attach_args *ta = aux;
    157 
    158 	return (tcds_lookup(ta->ta_modname) != NULL);
    159 }
    160 
    161 void
    162 tcdsattach(parent, self, aux)
    163 	struct device *parent, *self;
    164 	void *aux;
    165 {
    166 	struct tcds_softc *sc = (struct tcds_softc *)self;
    167 	struct tc_attach_args *ta = aux;
    168 	struct tcdsdev_attach_args tcdsdev;
    169 	struct tcds_slotconfig *slotc;
    170 	struct tcds_device *td;
    171 	bus_space_handle_t sbsh[2];
    172 	int i, gpi2;
    173 	const struct evcnt *pevcnt;
    174 	int help[2];
    175 	locdesc_t *ldesc = (void *)help; /* XXX */
    176 
    177 	td = tcds_lookup(ta->ta_modname);
    178 	if (td == NULL)
    179 		panic("\ntcdsattach: impossible");
    180 
    181 	printf(": TurboChannel Dual SCSI");
    182 	if (td->td_flags & TCDSF_BASEBOARD)
    183 		printf(" (baseboard)");
    184 	printf("\n");
    185 
    186 	sc->sc_flags = td->td_flags;
    187 
    188 	sc->sc_bst = ta->ta_memt;
    189 	sc->sc_dmat = ta->ta_dmat;
    190 
    191 	/*
    192 	 * Map the device.
    193 	 */
    194 	if (bus_space_map(sc->sc_bst, ta->ta_addr,
    195 	    (TCDS_SCSI1_OFFSET + 0x100), 0, &sc->sc_bsh)) {
    196 		printf("%s: unable to map device\n", sc->sc_dv.dv_xname);
    197 		return;
    198 	}
    199 
    200 	/*
    201 	 * Now, slice off two subregions for the individual NCR SCSI chips.
    202 	 */
    203 	if (bus_space_subregion(sc->sc_bst, sc->sc_bsh, TCDS_SCSI0_OFFSET,
    204 	    0x100, &sbsh[0]) ||
    205 	    bus_space_subregion(sc->sc_bst, sc->sc_bsh, TCDS_SCSI1_OFFSET,
    206 	    0x100, &sbsh[1])) {
    207 		printf("%s: unable to subregion SCSI chip space\n",
    208 		    sc->sc_dv.dv_xname);
    209 		return;
    210 	}
    211 
    212 	sc->sc_cookie = ta->ta_cookie;
    213 
    214 	pevcnt = tc_intr_evcnt(parent, sc->sc_cookie);
    215 	tc_intr_establish(parent, sc->sc_cookie, TC_IPL_BIO, tcds_intr, sc);
    216 
    217 	/*
    218 	 * XXX
    219 	 * IMER apparently has some random (or, not so random, but still
    220 	 * not useful) bits set in it when the system boots.  Clear it.
    221 	 */
    222 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_IMER, 0);
    223 
    224 	/* XXX Initial contents of CIR? */
    225 
    226 	/*
    227 	 * Remember if GPI2 is set in the CIR; we'll need it later.
    228 	 */
    229 	gpi2 = (bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR) &
    230 	    TCDS_CIR_GPI_2) != 0;
    231 
    232 	/*
    233 	 * Set up the per-slot definitions for later use.
    234 	 */
    235 
    236 	/* fill in common information first */
    237 	for (i = 0; i < 2; i++) {
    238 		char *cp;
    239 
    240 		slotc = &sc->sc_slots[i];
    241 		bzero(slotc, sizeof *slotc);	/* clear everything */
    242 
    243 		cp = slotc->sc_name;
    244 		snprintf(cp, sizeof(slotc->sc_name), "chip %d", i);
    245 		evcnt_attach_dynamic(&slotc->sc_evcnt, EVCNT_TYPE_INTR,
    246 		    pevcnt, sc->sc_dv.dv_xname, cp);
    247 
    248 		slotc->sc_slot = i;
    249 		slotc->sc_bst = sc->sc_bst;
    250 		slotc->sc_bsh = sc->sc_bsh;
    251 		slotc->sc_intrhand = tcds_intrnull;
    252 		slotc->sc_intrarg = (void *)(long)i;
    253 	}
    254 
    255 	/* information for slot 0 */
    256 	slotc = &sc->sc_slots[0];
    257 	slotc->sc_resetbits = TCDS_CIR_SCSI0_RESET;
    258 	slotc->sc_intrmaskbits =
    259 	    TCDS_IMER_SCSI0_MASK | TCDS_IMER_SCSI0_ENB;
    260 	slotc->sc_intrbits = TCDS_CIR_SCSI0_INT;
    261 	slotc->sc_dmabits = TCDS_CIR_SCSI0_DMAENA;
    262 	slotc->sc_errorbits = 0;				/* XXX */
    263 	slotc->sc_sda = TCDS_SCSI0_DMA_ADDR;
    264 	slotc->sc_dic = TCDS_SCSI0_DMA_INTR;
    265 	slotc->sc_dud0 = TCDS_SCSI0_DMA_DUD0;
    266 	slotc->sc_dud1 = TCDS_SCSI0_DMA_DUD1;
    267 
    268 	/* information for slot 1 */
    269 	slotc = &sc->sc_slots[1];
    270 	slotc->sc_resetbits = TCDS_CIR_SCSI1_RESET;
    271 	slotc->sc_intrmaskbits =
    272 	    TCDS_IMER_SCSI1_MASK | TCDS_IMER_SCSI1_ENB;
    273 	slotc->sc_intrbits = TCDS_CIR_SCSI1_INT;
    274 	slotc->sc_dmabits = TCDS_CIR_SCSI1_DMAENA;
    275 	slotc->sc_errorbits = 0;				/* XXX */
    276 	slotc->sc_sda = TCDS_SCSI1_DMA_ADDR;
    277 	slotc->sc_dic = TCDS_SCSI1_DMA_INTR;
    278 	slotc->sc_dud0 = TCDS_SCSI1_DMA_DUD0;
    279 	slotc->sc_dud1 = TCDS_SCSI1_DMA_DUD1;
    280 
    281 	/* find the hardware attached to the TCDS ASIC */
    282 	for (i = 0; i < 2; i++) {
    283 		tcds_params(sc, i, &tcdsdev.tcdsda_id,
    284 		    &tcdsdev.tcdsda_fast);
    285 
    286 		tcdsdev.tcdsda_bst = sc->sc_bst;
    287 		tcdsdev.tcdsda_bsh = sbsh[i];
    288 		tcdsdev.tcdsda_dmat = sc->sc_dmat;
    289 		tcdsdev.tcdsda_chip = i;
    290 		tcdsdev.tcdsda_sc = &sc->sc_slots[i];
    291 		/*
    292 		 * Determine the chip frequency.  TCDSF_FASTSCSI will be set
    293 		 * for TC option cards.  For baseboard chips, GPI2 is set, for a
    294 		 * 25MHz clock, else a 40MHz clock.
    295 		 */
    296 		if ((sc->sc_flags & TCDSF_BASEBOARD && gpi2 == 0) ||
    297 		    sc->sc_flags & TCDSF_FASTSCSI) {
    298 			tcdsdev.tcdsda_freq = 40000000;
    299 			tcdsdev.tcdsda_period = tcdsdev.tcdsda_fast ? 4 : 8;
    300 		} else {
    301 			tcdsdev.tcdsda_freq = 25000000;
    302 			tcdsdev.tcdsda_period = 5;
    303 		}
    304 		if (sc->sc_flags & TCDSF_BASEBOARD)
    305 			tcdsdev.tcdsda_variant = NCR_VARIANT_NCR53C94;
    306 		else
    307 			tcdsdev.tcdsda_variant = NCR_VARIANT_NCR53C96;
    308 
    309 		tcds_scsi_reset(tcdsdev.tcdsda_sc);
    310 
    311 		ldesc->len = 1;
    312 		ldesc->locs[TCDSCF_CHIP] = i;
    313 
    314 		config_found_sm_loc(self, "tcds", ldesc, &tcdsdev,
    315 				    tcdsprint, tcdssubmatch);
    316 #ifdef __alpha__
    317 		/*
    318 		 * The second SCSI chip isn't present on the baseboard TCDS
    319 		 * on the DEC Alpha 3000/300 series.
    320 		 */
    321 		if (sc->sc_flags & TCDSF_BASEBOARD &&
    322 		    cputype == ST_DEC_3000_300)
    323 			break;
    324 #endif /* __alpha__ */
    325 	}
    326 }
    327 
    328 int
    329 tcdssubmatch(parent, cf, ldesc, aux)
    330 	struct device *parent;
    331 	struct cfdata *cf;
    332 	const locdesc_t *ldesc;
    333 	void *aux;
    334 {
    335 
    336 	if (cf->cf_loc[TCDSCF_CHIP] != TCDSCF_CHIP_DEFAULT &&
    337 	    cf->cf_loc[TCDSCF_CHIP] != ldesc->locs[TCDSCF_CHIP])
    338 		return (0);
    339 
    340 	return (config_match(parent, cf, aux));
    341 }
    342 
    343 int
    344 tcdsprint(aux, pnp)
    345 	void *aux;
    346 	const char *pnp;
    347 {
    348 	struct tcdsdev_attach_args *tcdsdev = aux;
    349 
    350 	/* Only ASCs can attach to TCDSs; easy. */
    351 	if (pnp)
    352 		aprint_normal("asc at %s", pnp);
    353 
    354 	aprint_normal(" chip %d", tcdsdev->tcdsda_chip);
    355 
    356 	return (UNCONF);
    357 }
    358 
    359 void
    360 tcds_intr_establish(tcds, slot, func, arg)
    361 	struct device *tcds;
    362 	int slot;
    363 	int (*func)(void *);
    364 	void *arg;
    365 {
    366 	struct tcds_softc *sc = (struct tcds_softc *)tcds;
    367 
    368 	if (sc->sc_slots[slot].sc_intrhand != tcds_intrnull)
    369 		panic("tcds_intr_establish: chip %d twice", slot);
    370 
    371 	sc->sc_slots[slot].sc_intrhand = func;
    372 	sc->sc_slots[slot].sc_intrarg = arg;
    373 	tcds_scsi_reset(&sc->sc_slots[slot]);
    374 }
    375 
    376 void
    377 tcds_intr_disestablish(tcds, slot)
    378 	struct device *tcds;
    379 	int slot;
    380 {
    381 	struct tcds_softc *sc = (struct tcds_softc *)tcds;
    382 
    383 	if (sc->sc_slots[slot].sc_intrhand == tcds_intrnull)
    384 		panic("tcds_intr_disestablish: chip %d missing intr",
    385 		    slot);
    386 
    387 	sc->sc_slots[slot].sc_intrhand = tcds_intrnull;
    388 	sc->sc_slots[slot].sc_intrarg = (void *)(u_long)slot;
    389 
    390 	tcds_dma_enable(&sc->sc_slots[slot], 0);
    391 	tcds_scsi_enable(&sc->sc_slots[slot], 0);
    392 }
    393 
    394 int
    395 tcds_intrnull(val)
    396 	void *val;
    397 {
    398 
    399 	panic("tcds_intrnull: uncaught TCDS intr for chip %lu",
    400 	    (u_long)val);
    401 }
    402 
    403 void
    404 tcds_scsi_reset(sc)
    405 	struct tcds_slotconfig *sc;
    406 {
    407 	u_int32_t cir;
    408 
    409 	tcds_dma_enable(sc, 0);
    410 	tcds_scsi_enable(sc, 0);
    411 
    412 	cir = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    413 	TCDS_CIR_CLR(cir, sc->sc_resetbits);
    414 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR, cir);
    415 
    416 	DELAY(1);
    417 
    418 	cir = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    419 	TCDS_CIR_SET(cir, sc->sc_resetbits);
    420 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR, cir);
    421 
    422 	tcds_scsi_enable(sc, 1);
    423 	tcds_dma_enable(sc, 1);
    424 }
    425 
    426 void
    427 tcds_scsi_enable(sc, on)
    428 	struct tcds_slotconfig *sc;
    429 	int on;
    430 {
    431 	u_int32_t imer;
    432 
    433 	imer = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_IMER);
    434 
    435 	if (on)
    436 		imer |= sc->sc_intrmaskbits;
    437 	else
    438 		imer &= ~sc->sc_intrmaskbits;
    439 
    440 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_IMER, imer);
    441 }
    442 
    443 void
    444 tcds_dma_enable(sc, on)
    445 	struct tcds_slotconfig *sc;
    446 	int on;
    447 {
    448 	u_int32_t cir;
    449 
    450 	cir = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    451 
    452 	/* XXX Clear/set IOSLOT/PBS bits. */
    453 	if (on)
    454 		TCDS_CIR_SET(cir, sc->sc_dmabits);
    455 	else
    456 		TCDS_CIR_CLR(cir, sc->sc_dmabits);
    457 
    458 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR, cir);
    459 }
    460 
    461 int
    462 tcds_scsi_isintr(sc, clear)
    463 	struct tcds_slotconfig *sc;
    464 	int clear;
    465 {
    466 	u_int32_t cir;
    467 
    468 	cir = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    469 
    470 	if ((cir & sc->sc_intrbits) != 0) {
    471 		if (clear) {
    472 			TCDS_CIR_CLR(cir, sc->sc_intrbits);
    473 			bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR,
    474 			    cir);
    475 		}
    476 		return (1);
    477 	} else
    478 		return (0);
    479 }
    480 
    481 int
    482 tcds_scsi_iserr(sc)
    483 	struct tcds_slotconfig *sc;
    484 {
    485 	u_int32_t cir;
    486 
    487 	cir = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    488 	return ((cir & sc->sc_errorbits) != 0);
    489 }
    490 
    491 int
    492 tcds_intr(arg)
    493 	void *arg;
    494 {
    495 	struct tcds_softc *sc = arg;
    496 	u_int32_t ir, ir0;
    497 
    498 	/*
    499 	 * XXX
    500 	 * Copy and clear (gag!) the interrupts.
    501 	 */
    502 	ir = ir0 = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR);
    503 	TCDS_CIR_CLR(ir0, TCDS_CIR_ALLINTR);
    504 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, TCDS_CIR, ir0);
    505 	tc_syncbus();
    506 
    507 #define	INCRINTRCNT(slot)	sc->sc_slots[slot].sc_evcnt.ev_count++
    508 
    509 #define	CHECKINTR(slot)							\
    510 	if (ir & sc->sc_slots[slot].sc_intrbits) {			\
    511 		INCRINTRCNT(slot);					\
    512 		(void)(*sc->sc_slots[slot].sc_intrhand)			\
    513 		    (sc->sc_slots[slot].sc_intrarg);			\
    514 	}
    515 	CHECKINTR(0);
    516 	CHECKINTR(1);
    517 #undef CHECKINTR
    518 
    519 #ifdef DIAGNOSTIC
    520 	/*
    521 	 * Interrupts not currently handled, but would like to know if they
    522 	 * occur.
    523 	 *
    524 	 * XXX
    525 	 * Don't know if we have to set the interrupt mask and enable bits
    526 	 * in the IMER to allow some of them to happen?
    527 	 */
    528 #define	PRINTINTR(msg, bits)						\
    529 	if (ir & bits)							\
    530 		printf("%s: %s", sc->sc_dv.dv_xname, msg);
    531 	PRINTINTR("SCSI0 DREQ interrupt.\n", TCDS_CIR_SCSI0_DREQ);
    532 	PRINTINTR("SCSI1 DREQ interrupt.\n", TCDS_CIR_SCSI1_DREQ);
    533 	PRINTINTR("SCSI0 prefetch interrupt.\n", TCDS_CIR_SCSI0_PREFETCH);
    534 	PRINTINTR("SCSI1 prefetch interrupt.\n", TCDS_CIR_SCSI1_PREFETCH);
    535 	PRINTINTR("SCSI0 DMA error.\n", TCDS_CIR_SCSI0_DMA);
    536 	PRINTINTR("SCSI1 DMA error.\n", TCDS_CIR_SCSI1_DMA);
    537 	PRINTINTR("SCSI0 DB parity error.\n", TCDS_CIR_SCSI0_DB);
    538 	PRINTINTR("SCSI1 DB parity error.\n", TCDS_CIR_SCSI1_DB);
    539 	PRINTINTR("SCSI0 DMA buffer parity error.\n", TCDS_CIR_SCSI0_DMAB_PAR);
    540 	PRINTINTR("SCSI1 DMA buffer parity error.\n", TCDS_CIR_SCSI1_DMAB_PAR);
    541 	PRINTINTR("SCSI0 DMA read parity error.\n", TCDS_CIR_SCSI0_DMAR_PAR);
    542 	PRINTINTR("SCSI1 DMA read parity error.\n", TCDS_CIR_SCSI1_DMAR_PAR);
    543 	PRINTINTR("TC write parity error.\n", TCDS_CIR_TCIOW_PAR);
    544 	PRINTINTR("TC I/O address parity error.\n", TCDS_CIR_TCIOA_PAR);
    545 #undef PRINTINTR
    546 #endif
    547 
    548 	/*
    549 	 * XXX
    550 	 * The MACH source had this, with the comment:
    551 	 *	This is wrong, but machine keeps dying.
    552 	 */
    553 	DELAY(1);
    554 
    555 	return (1);
    556 }
    557 
    558 void
    559 tcds_params(sc, chip, idp, fastp)
    560 	struct tcds_softc *sc;
    561 	int chip, *idp, *fastp;
    562 {
    563 	int id, fast;
    564 	u_int32_t ids;
    565 
    566 #ifdef __alpha__
    567 	if (sc->sc_flags & TCDSF_BASEBOARD) {
    568 		extern u_int8_t dec_3000_scsiid[], dec_3000_scsifast[];
    569 
    570 		id = dec_3000_scsiid[chip];
    571 		fast = dec_3000_scsifast[chip];
    572 	} else
    573 #endif /* __alpha__ */
    574 	{
    575 		/*
    576 		 * SCSI IDs are stored in the EEPROM, along with whether or
    577 		 * not the device is "fast".  Chip 0 is the high nibble,
    578 		 * chip 1 the low nibble.
    579 		 */
    580 		ids = bus_space_read_4(sc->sc_bst, sc->sc_bsh, TCDS_EEPROM_IDS);
    581 		if (chip == 0)
    582 			ids >>= 4;
    583 
    584 		id = ids & 0x7;
    585 		fast = ids & 0x8;
    586 	}
    587 
    588 	if (id < 0 || id > 7) {
    589 		printf("%s: WARNING: bad SCSI ID %d for chip %d, using 7\n",
    590 		    sc->sc_dv.dv_xname, id, chip);
    591 		id = 7;
    592 	}
    593 
    594 	if (fast)
    595 		printf("%s: fast mode set for chip %d\n",
    596 		    sc->sc_dv.dv_xname, chip);
    597 
    598 	*idp = id;
    599 	*fastp = fast;
    600 }
    601