initial import of NetBSD tree

1 files changed, 1007 insertions, 0 deletions

diff --git a/sys/arch/sun3/dev/si.c b/sys/arch/sun3/dev/si.c
new file mode 100644
index 00000000000..b803393242e
--- /dev/null
+++ b/sys/arch/sun3/dev/si.c
@@ -0,0 +1,1007 @@
+/*	$NetBSD: si.c,v 1.22 1995/10/08 23:42:58 gwr Exp $	*/
+
+/*
+ * Copyright (C) 1994 Adam Glass, Gordon W. Ross
+ * Copyright (C) 1993	Allen K. Briggs, Chris P. Caputo,
+ *			Michael L. Finch, Bradley A. Grantham, and
+ *			Lawrence A. Kesteloot
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the Alice Group.
+ * 4. The names of the Alice Group or any of its members may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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.
+ */
+
+#define DEBUG 1
+
+/* XXX - Need to add support for real DMA. -gwr */
+/* #define PSEUDO_DMA 1 (broken) */
+
+#include <sys/types.h>
+#include <sys/malloc.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/buf.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/device.h>
+
+#include <machine/autoconf.h>
+#include <machine/isr.h>
+#include <machine/obio.h>
+
+#include <scsi/scsi_all.h>
+#include <scsi/scsi_debug.h>
+#include <scsi/scsiconf.h>
+
+#include "scsi_defs.h"
+#include "scsi_5380.h"
+#include "scsi_sunsi.h"
+
+#ifdef	DEBUG
+static int si_debug = 0;
+static int si_flags = 0 /* | SDEV_DB2 */ ;
+#endif
+
+#define SCI_PHASE_DISC		0	/* sort of ... */
+#define SCI_CLR_INTR(regs)	((volatile)(regs->sci_iack))
+#define SCI_ACK(ptr,phase)	(ptr)->sci_tcmd = (phase)
+#define SCSI_TIMEOUT_VAL	1000000
+#define WAIT_FOR_NOT_REQ(ptr) {	\
+	int scsi_timeout = SCSI_TIMEOUT_VAL; \
+	while ( ((ptr)->sci_bus_csr & SCI_BUS_REQ) && \
+		 ((ptr)->sci_bus_csr & SCI_BUS_REQ) && \
+		 ((ptr)->sci_bus_csr & SCI_BUS_REQ) && \
+		 (--scsi_timeout) ); \
+	if (!scsi_timeout) { \
+		printf("scsi timeout--WAIT_FOR_NOT_REQ---%s, line %d.\n", \
+			__FILE__, __LINE__); \
+		goto scsi_timeout_error; \
+	} \
+	}
+#define WAIT_FOR_REQ(ptr) {	\
+	int scsi_timeout = SCSI_TIMEOUT_VAL; \
+	while ( (((ptr)->sci_bus_csr & SCI_BUS_REQ) == 0) && \
+		(((ptr)->sci_bus_csr & SCI_BUS_REQ) == 0) && \
+		(((ptr)->sci_bus_csr & SCI_BUS_REQ) == 0) && \
+		 (--scsi_timeout) ); \
+	if (!scsi_timeout) { \
+		printf("scsi timeout--WAIT_FOR_REQ---%s, line %d.\n", \
+			__FILE__, __LINE__); \
+		goto scsi_timeout_error; \
+	} \
+	}
+#define WAIT_FOR_BSY(ptr) {	\
+	int scsi_timeout = SCSI_TIMEOUT_VAL; \
+	while ( (((ptr)->sci_bus_csr & SCI_BUS_BSY) == 0) && \
+		(((ptr)->sci_bus_csr & SCI_BUS_BSY) == 0) && \
+		(((ptr)->sci_bus_csr & SCI_BUS_BSY) == 0) && \
+		 (--scsi_timeout) ); \
+	if (!scsi_timeout) { \
+		printf("scsi timeout--WAIT_FOR_BSY---%s, line %d.\n", \
+			__FILE__, __LINE__); \
+		goto scsi_timeout_error; \
+	} \
+	}
+
+#define ARBITRATION_RETRIES 1000
+
+/* XXX - Always available, but might do nothing. */
+int Debugger();
+
+struct ncr5380_softc {
+    struct device sc_dev;
+    volatile void *sc_regs;
+    int sc_adapter_type;
+    int sc_adapter_iv_am;	/* int. vec + address modifier */
+    struct scsi_link sc_link;
+};
+
+static void		ncr5380_minphys(struct buf *bp);
+static int		ncr5380_scsi_cmd(struct scsi_xfer *xs);
+static int		ncr5380_reset_adapter(struct ncr5380_softc *);
+static int		ncr5380_reset_scsibus(struct ncr5380_softc *);
+static int		ncr5380_poll(int adapter, int timeout);
+static int		ncr5380_send_cmd(struct scsi_xfer *xs);
+
+static int		ncr_intr(void *);
+
+static int	si_generic(int adapter, int id, int lun,
+			 struct scsi_generic *cmd, int cmdlen,
+			 void *databuf, int datalen);
+static int	si_group0(int adapter, int id, int lun,
+			    int opcode, int addr, int len,
+			    int flags, caddr_t databuf, int datalen);
+
+static char scsi_name[] = "si";
+
+struct scsi_adapter	ncr5380_switch = {
+	ncr5380_scsi_cmd,		/* scsi_cmd()		*/
+	ncr5380_minphys,		/* scsi_minphys()	*/
+	NULL,				/* open_target_lu()	*/
+	NULL,				/* close_target_lu()	*/
+};
+
+/* This is copied from julian's bt driver */
+/* "so we have a default dev struct for our link struct." */
+struct scsi_device ncr_dev = {
+	NULL,		/* Use default error handler.	    */
+	NULL,		/* Use default start handler.		*/
+	NULL,		/* Use default async handler.	    */
+	NULL,		/* Use default "done" routine.	    */
+};
+
+static int	si_match();
+static void	si_attach();
+
+struct cfdriver sicd = {
+	NULL, "si", si_match, si_attach, DV_DULL,
+	sizeof(struct ncr5380_softc), NULL, 0,
+};
+
+static int
+si_print(aux, name)
+	void *aux;
+	char *name;
+{
+	if (name != NULL)
+		printf("%s: scsibus ", name);
+	return UNCONF;
+}
+
+static int
+si_match(parent, vcf, args)
+	struct device	*parent;
+	void		*vcf, *args;
+{
+	struct cfdata	*cf = vcf;
+	struct confargs *ca = args;
+	int x, probe_addr;
+
+	/* Default interrupt priority always splbio==2 */
+	if (ca->ca_intpri == -1)
+		ca->ca_intpri = 2;
+
+	if ((cpu_machine_id == SUN3_MACH_50) ||
+	    (cpu_machine_id == SUN3_MACH_60) )
+	{
+		/* Sun3/50 or Sun3/60 have only OBIO "si" */
+		if (ca->ca_bustype != BUS_OBIO)
+			return(0);
+		if (ca->ca_paddr == -1)
+			ca->ca_paddr = OBIO_NCR_SCSI;
+		/* OK... */
+	} else {
+		/* Other Sun3 models may have VME "si" or "sc" */
+		if (ca->ca_bustype != BUS_VME16)
+			return (0);
+		if (ca->ca_paddr == -1)
+			return (0);
+		/* OK... */
+	}
+
+	/* Make sure there is something there... */
+	x = bus_peek(ca->ca_bustype, ca->ca_paddr + 1, 1);
+	if (x == -1)
+		return (0);
+
+	/*
+	 * If this is a VME SCSI board, we have to determine whether
+	 * it is an "sc" (Sun2) or "si" (Sun3) SCSI board.  This can
+	 * be determined using the fact that the "sc" board occupies
+	 * 4K bytes in VME space but the "si" board occupies 2K bytes.
+	 */
+	if (ca->ca_bustype == BUS_VME16) {
+		/* Note, the "si" board should NOT respond here. */
+		x = bus_peek(ca->ca_bustype, ca->ca_paddr + 0x801, 1);
+		if (x != -1)
+			return(0);
+	}
+
+    return (1);
+}
+
+static void
+si_attach(parent, self, args)
+	struct device	*parent, *self;
+	void		*args;
+{
+	struct ncr5380_softc *ncr5380 = (struct ncr5380_softc *) self;
+	volatile struct si_regs *regs;
+	struct confargs *ca = args;
+
+	switch (ca->ca_bustype) {
+
+	case BUS_OBIO:
+		regs = (struct si_regs *)
+			obio_alloc(ca->ca_paddr, sizeof(*regs));
+		isr_add_autovect(ncr_intr, (void *)ncr5380,
+						 ca->ca_intpri);
+		break;
+
+	case BUS_VME16:
+		regs = (struct si_regs *)
+			bus_mapin(ca->ca_bustype, ca->ca_paddr, sizeof(*regs));
+		isr_add_vectored(ncr_intr, (void *)ncr5380,
+						 ca->ca_intpri, ca->ca_intvec);
+		break;
+
+	default:
+		printf("unknown\n");
+		return;
+	}
+
+	ncr5380->sc_adapter_type = ca->ca_bustype;
+	ncr5380->sc_adapter_iv_am =
+		VME_SUPV_DATA_24 | (ca->ca_intvec & 0xFF);
+	ncr5380->sc_regs = regs;
+
+	/*
+	 * fill in the prototype scsi_link.
+	 */
+    ncr5380->sc_link.adapter_softc = ncr5380;
+    ncr5380->sc_link.adapter_target = 7;
+    ncr5380->sc_link.adapter = &ncr5380_switch;
+    ncr5380->sc_link.device = &ncr_dev;
+    ncr5380->sc_link.openings = 2;
+#ifdef	DEBUG
+    ncr5380->sc_link.flags |= si_flags;
+#endif
+
+    printf("\n");
+	ncr5380_reset_adapter(ncr5380);
+	ncr5380_reset_scsibus(ncr5380);
+	config_found(self, &(ncr5380->sc_link), si_print);
+}
+
+#define MIN_PHYS	65536	/*BARF!!!!*/
+static void
+ncr5380_minphys(struct buf *bp)
+{
+	if (bp->b_bcount > MIN_PHYS) {
+		printf("Uh-oh...  ncr5380_minphys setting bp->b_bcount = %x.\n", MIN_PHYS);
+		bp->b_bcount = MIN_PHYS;
+	}
+	minphys(bp);
+}
+#undef MIN_PHYS
+
+static int
+ncr5380_scsi_cmd(struct scsi_xfer *xs)
+{
+	int flags, s, r;
+
+	flags = xs->flags;
+	if (xs->bp) flags |= (SCSI_NOSLEEP);
+	if ( flags & ITSDONE ) {
+		printf("Already done?");
+		xs->flags &= ~ITSDONE;
+	}
+	if ( ! ( flags & INUSE ) ) {
+		printf("Not in use?");
+		xs->flags |= INUSE;
+	}
+
+	s = splbio();
+
+	if ( flags & SCSI_RESET ) {
+		printf("flags & SCSIRESET.\n");
+		ncr5380_reset_scsibus(xs->sc_link->adapter_softc);
+		r = COMPLETE;
+	} else {
+		r = ncr5380_send_cmd(xs);
+		xs->flags |= ITSDONE;
+		scsi_done(xs);
+	}
+
+	splx(s);
+
+	switch(r) {
+	case COMPLETE:
+	case SUCCESSFULLY_QUEUED:
+		r = SUCCESSFULLY_QUEUED;
+		if (xs->flags & SCSI_POLL)
+			r = COMPLETE;
+		break;
+	default:
+		break;
+	}
+	return r;
+}
+
+#ifdef	DEBUG
+static int
+ncr5380_show_scsi_cmd(struct scsi_xfer *xs)
+{
+	u_char	*b = (u_char *) xs->cmd;
+	int	i  = 0;
+
+	if ( ! ( xs->flags & SCSI_RESET ) ) {
+		printf("si(%d:%d:%d)-",
+			   xs->sc_link->scsibus,
+			   xs->sc_link->target,
+			   xs->sc_link->lun);
+		while (i < xs->cmdlen) {
+			if (i) printf(",");
+			printf("%x",b[i++]);
+		}
+		printf("-\n");
+	} else {
+		printf("si(%d:%d:%d)-RESET-\n",
+			   xs->sc_link->scsibus,
+			   xs->sc_link->target,
+			   xs->sc_link->lun);
+	}
+}
+#endif
+
+/*
+ * Actual chip control.
+ */
+
+static void
+ncr_sbc_intr(struct ncr5380_softc *ncr5380)
+{
+	volatile sci_regmap_t *regs = ncr5380->sc_regs;
+
+	if ((regs->sci_csr & SCI_CSR_INT) == 0) {
+#ifdef	DEBUG
+		printf (" ncr_sbc_intr: spurrious\n");
+#endif
+		return;
+	}
+
+	SCI_CLR_INTR(regs);
+#ifdef	DEBUG
+	printf (" ncr_sbc_intr\n");
+#endif
+}
+
+static void
+ncr_dma_intr(struct ncr5380_softc *ncr5380)
+{
+	volatile struct si_regs *regs = ncr5380->sc_regs;
+
+#ifdef	DEBUG
+	printf (" ncr_dma_intr\n");
+#endif
+}
+
+static int
+ncr_intr(void *arg)
+{
+	struct ncr5380_softc *ncr5380 = arg;
+	volatile struct si_regs *si = ncr5380->sc_regs;
+	int rv = 0;
+
+	/* Interrupts not enabled?  Can not be for us. */
+	if ((si->si_csr & SI_CSR_INTR_EN) == 0)
+		return rv;
+
+	if (si->si_csr & SI_CSR_DMA_IP) {
+		ncr_dma_intr(ncr5380);
+		rv++;
+	}
+	if (si->si_csr & SI_CSR_SBC_IP) {
+		ncr_sbc_intr(ncr5380);
+		rv++;
+	}
+	return rv;
+}
+
+static int
+ncr5380_reset_adapter(struct ncr5380_softc *sc)
+{
+	volatile struct si_regs *si = sc->sc_regs;
+
+#ifdef	DEBUG
+	if (si_debug) {
+		printf("si_reset_adapter\n");
+	}
+#endif
+
+	/* The reset bits in the CSR are active low. */
+	si->si_csr = 0;
+	delay(20);
+	si->si_csr = SI_CSR_FIFO_RES | SI_CSR_SCSI_RES;
+	si->fifo_count = 0;
+	if (sc->sc_adapter_type == BUS_VME16) {
+		si->dma_addrh = 0;
+		si->dma_addrl = 0;
+		si->dma_counth = 0;
+		si->dma_countl = 0;
+		si->iv_am = sc->sc_adapter_iv_am;
+	}
+}
+
+static int
+ncr5380_reset_scsibus(struct ncr5380_softc *ncr5380)
+{
+	volatile sci_regmap_t *regs = ncr5380->sc_regs;
+
+#ifdef	DEBUG
+	if (si_debug) {
+		printf("si_reset_scsibus\n");
+	}
+#endif
+
+	regs->sci_icmd = SCI_ICMD_RST;
+	delay(100);
+	regs->sci_icmd = 0;
+
+	regs->sci_mode = 0;
+	regs->sci_tcmd = SCI_PHASE_DISC;
+	regs->sci_sel_enb = 0;
+
+	SCI_CLR_INTR(regs);
+	/* XXX - Need long delay here! */
+}
+
+static int
+ncr5380_poll(int adapter, int timeout)
+{
+}
+
+static int
+ncr5380_send_cmd(struct scsi_xfer *xs)
+{
+	int	sense;
+
+#ifdef	DIAGNOSTIC
+	if ((getsr() & PSL_IPL) < PSL_IPL2)
+		panic("ncr_send_cmd: bad spl");
+#endif
+
+#ifdef	DEBUG
+	if (si_debug & 2)
+		ncr5380_show_scsi_cmd(xs);
+#endif
+
+	sense = si_generic( xs->sc_link->scsibus, xs->sc_link->target,
+			  xs->sc_link->lun, xs->cmd, xs->cmdlen,
+			  xs->data, xs->datalen );
+
+	switch (sense) {
+	case 0:	/* success */
+		xs->resid = 0;
+		xs->error = XS_NOERROR;
+		break;
+
+	case 0x02:	/* Check condition */
+#ifdef	DEBUG
+		if (si_debug)
+			printf("check cond. target %d.\n",
+				   xs->sc_link->target);
+#endif
+		delay(10);	/* Phil's fix for slow devices. */
+		si_group0(xs->sc_link->scsibus,
+				  xs->sc_link->target,
+				  xs->sc_link->lun,
+				  0x3, 0x0,
+				  sizeof(struct scsi_sense_data),
+				  0, (caddr_t) &(xs->sense),
+				  sizeof(struct scsi_sense_data));
+		xs->error = XS_SENSE;
+		break;
+	case 0x08:	/* Busy - common code will delay, retry. */
+		xs->error = XS_BUSY;
+		break;
+	default:	/* Dead - tell common code to give up. */
+		xs->error = XS_DRIVER_STUFFUP;
+		break;
+
+	}
+	return (COMPLETE);
+}
+
+static int
+si_select_target(register volatile sci_regmap_t *regs,
+	      u_char myid, u_char tid, int with_atn)
+{
+	register u_char	bid, icmd;
+	int		ret = SCSI_RET_RETRY;
+	int 	arb_retries, arb_wait;
+
+	/* for our purposes.. */
+	myid = 1 << myid;
+	tid = 1 << tid;
+
+	regs->sci_sel_enb = 0; /* we don't want any interrupts. */
+	regs->sci_tcmd = 0;	/* get into a harmless state */
+
+	arb_retries = ARBITRATION_RETRIES;
+
+retry_arbitration:
+	regs->sci_mode = 0;	/* get into a harmless state */
+wait_for_bus_free:
+	if (--arb_retries <= 0) {
+#ifdef	DEBUG
+		if (si_debug) {
+			printf("si_select: arb_retries expended; resetting...\n");
+		}
+#endif
+		ret = SCSI_RET_NEED_RESET;
+		goto nosel;
+	}
+
+	icmd = regs->sci_icmd & ~(SCI_ICMD_DIFF|SCI_ICMD_TEST);
+
+	if (regs->sci_bus_csr & (SCI_BUS_BSY|SCI_BUS_SEL)) {
+		/* Something is sitting on the SCSI bus... */
+#ifdef	DEBUG
+		/* Only complain once (the last time through). */
+		if (si_debug && (arb_retries <= 1)) {
+			printf("si_select_target: still BSY+SEL\n");
+		}
+#endif
+		/* Give it a little time, then try again. */
+		delay(10);
+		goto wait_for_bus_free;
+	}
+
+	regs->sci_odata = myid;
+	regs->sci_mode = SCI_MODE_ARB;
+/*	regs->sci_mode |= SCI_MODE_ARB;	XXX? */
+
+	/* AIP might not set if BSY went true after we checked */
+	/* Wait up to about 100 usec. for it to appear. */
+	arb_wait = 50;	/* X2 */
+	do {
+		if (regs->sci_icmd & SCI_ICMD_AIP)
+			goto got_aip;
+		delay2us();
+	} while (--arb_wait > 0);
+	/* XXX - Could have missed it? */
+#ifdef	DEBUG
+	if (si_debug)
+		printf("si_select_target: API did not appear\n");
+#endif
+	goto retry_arbitration;
+
+	got_aip:
+#ifdef	DEBUG
+	if (si_debug & 4) {
+		printf("si_select_target: API after %d tries (last wait %d)\n",
+			   ARBITRATION_RETRIES - arb_retries,
+			   (50 - arb_wait));
+	}
+#endif
+
+	delay(3);	/* 2.2 uSec. arbitration delay */
+
+	if (regs->sci_icmd & SCI_ICMD_LST) {
+#ifdef	DEBUG
+		if (si_debug)
+			printf ("lost 1\n");
+#endif
+		goto retry_arbitration;	/* XXX */
+	}
+
+	regs->sci_mode &= ~SCI_MODE_PAR_CHK;
+	bid = regs->sci_data;
+
+	if ((bid & ~myid) > myid) {
+#ifdef	DEBUG
+		if (si_debug)
+			printf ("lost 2\n");
+#endif
+		/* Trying again will not help. */
+		goto lost;
+	}
+	if (regs->sci_icmd & SCI_ICMD_LST) {
+#ifdef	DEBUG
+		if (si_debug)
+			printf ("lost 3\n");
+#endif
+		goto lost;
+	}
+
+	/* Won arbitration, enter selection phase now */
+	icmd = regs->sci_icmd & ~(SCI_ICMD_DIFF|SCI_ICMD_TEST);
+	icmd |= (with_atn ? (SCI_ICMD_SEL|SCI_ICMD_ATN) : SCI_ICMD_SEL);
+	regs->sci_icmd = icmd;
+
+	if (regs->sci_icmd & SCI_ICMD_LST) {
+#ifdef	DEBUG
+		if (si_debug)
+			printf ("nosel\n");
+#endif
+		goto nosel;
+	}
+
+	/* XXX a target that violates specs might still drive the bus XXX */
+	/* XXX should put our id out, and after the delay check nothi XXX */
+	/* XXX ng else is out there.				      XXX */
+
+	delay2us();
+
+	regs->sci_sel_enb = 0;
+
+	regs->sci_odata = myid | tid;
+
+	icmd |= SCI_ICMD_BSY|SCI_ICMD_DATA;
+	regs->sci_icmd = icmd;
+
+/*	regs->sci_mode &= ~SCI_MODE_ARB;	 2 deskew delays, too */
+	regs->sci_mode = 0;			/* 2 deskew delays, too */
+
+	icmd &= ~SCI_ICMD_BSY;
+	regs->sci_icmd = icmd;
+
+	/* bus settle delay, 400ns */
+	delay2us(); /* too much (was 2) ? */
+
+	regs->sci_mode |= SCI_MODE_PAR_CHK;
+
+	{
+		register int timeo  = 2500;/* 250 msecs in 100 usecs chunks */
+		while ((regs->sci_bus_csr & SCI_BUS_BSY) == 0) {
+			if (--timeo > 0) {
+				delay(100);
+			} else {
+				/* This is the "normal" no-such-device select error. */
+#ifdef	DEBUG
+				if (si_debug)
+					printf("si_select: not BSY (nothing there)\n");
+#endif
+				goto nodev;
+			}
+		}
+	}
+
+	icmd &= ~(SCI_ICMD_DATA|SCI_ICMD_SEL);
+	regs->sci_icmd = icmd;
+/*	regs->sci_sel_enb = myid;*/	/* looks like we should NOT have it */
+	/* XXX - SCI_MODE_PAR_CHK ? */
+	return SCSI_RET_SUCCESS;
+
+nodev:
+	ret = SCSI_RET_DEVICE_DOWN;
+	regs->sci_sel_enb = myid;
+nosel:
+	regs->sci_icmd = 0;
+	regs->sci_mode = 0;
+	return ret;
+
+lost:
+	regs->sci_icmd = 0;
+	regs->sci_mode = 0;
+#ifdef	DEBUG
+	if (si_debug) {
+		printf("si_select: lost arbitration\n");
+	}
+#endif
+	return ret;
+}
+
+sci_data_out(regs, phase, count, data)
+	register volatile sci_regmap_t	*regs;
+	unsigned char		*data;
+{
+	register unsigned char	icmd;
+	register int		cnt=0;
+
+	/* ..checks.. */
+
+	icmd = regs->sci_icmd & ~(SCI_ICMD_DIFF|SCI_ICMD_TEST);
+loop:
+	/* SCSI bus phase not valid until REQ is true. */
+	WAIT_FOR_REQ(regs);
+	if (SCI_CUR_PHASE(regs->sci_bus_csr) != phase)
+		return cnt;
+
+	icmd |= SCI_ICMD_DATA;
+	regs->sci_icmd = icmd;
+	regs->sci_odata = *data++;
+	icmd |= SCI_ICMD_ACK;
+	regs->sci_icmd = icmd;
+
+	icmd &= ~(SCI_ICMD_DATA|SCI_ICMD_ACK);
+	WAIT_FOR_NOT_REQ(regs);
+	regs->sci_icmd = icmd;
+	++cnt;
+	if (--count > 0)
+		goto loop;
+scsi_timeout_error:
+	return cnt;
+}
+
+sci_data_in(regs, phase, count, data)
+	register volatile sci_regmap_t	*regs;
+	unsigned char		*data;
+{
+	register unsigned char	icmd;
+	register int		cnt=0;
+
+	/* ..checks.. */
+
+	icmd = regs->sci_icmd & ~(SCI_ICMD_DIFF|SCI_ICMD_TEST);
+
+loop:
+	/* SCSI bus phase not valid until REQ is true. */
+	WAIT_FOR_REQ(regs);
+	if (SCI_CUR_PHASE(regs->sci_bus_csr) != phase)
+		return cnt;
+
+	*data++ = regs->sci_data;
+	icmd |= SCI_ICMD_ACK;
+	regs->sci_icmd = icmd;
+
+	icmd &= ~SCI_ICMD_ACK;
+	WAIT_FOR_NOT_REQ(regs);
+	regs->sci_icmd = icmd;
+	++cnt;
+	if (--count > 0)
+		goto loop;
+
+scsi_timeout_error:
+	return cnt;
+}
+
+/* Return -1 (error) or number of bytes sent (>=0). */
+static int
+si_command_transfer(register volatile sci_regmap_t *regs,
+		 int maxlen, u_char *data, u_char *status, u_char *msg)
+{
+	int	xfer, phase;
+
+	xfer = 0;
+	regs->sci_icmd = 0;
+
+	while (1) {
+
+		WAIT_FOR_REQ(regs);
+
+		phase = SCI_CUR_PHASE(regs->sci_bus_csr);
+
+		switch (phase) {
+			case SCSI_PHASE_CMD:
+				SCI_ACK(regs,SCSI_PHASE_CMD);
+				xfer += sci_data_out(regs, SCSI_PHASE_CMD,
+						   	maxlen, data);
+				goto out;
+
+			case SCSI_PHASE_DATA_IN:
+				printf("command_transfer: Data in phase?\n");
+				goto err;
+
+			case SCSI_PHASE_DATA_OUT:
+				printf("command_transfer: Data out phase?\n");
+				goto err;
+
+			case SCSI_PHASE_STATUS:
+				SCI_ACK(regs,SCSI_PHASE_STATUS);
+				printf("command_transfer: status in...\n");
+				sci_data_in(regs, SCSI_PHASE_STATUS,
+					  	1, status);
+				printf("command_transfer: status=0x%x\n", *status);
+				goto err;
+
+			case SCSI_PHASE_MESSAGE_IN:
+				SCI_ACK(regs,SCSI_PHASE_MESSAGE_IN);
+				printf("command_transfer: msg in?\n");
+				sci_data_in(regs, SCSI_PHASE_MESSAGE_IN,
+					  	1, msg);
+				break;
+
+			case SCSI_PHASE_MESSAGE_OUT:
+				SCI_ACK(regs,SCSI_PHASE_MESSAGE_OUT);
+				sci_data_out(regs, SCSI_PHASE_MESSAGE_OUT,
+					  	1, msg);
+				break;
+
+			default:
+				printf("command_transfer: Unexpected phase 0x%x\n", phase);
+				goto err;
+		}
+	}
+scsi_timeout_error:
+ err:
+	xfer = -1;
+ out:
+	return xfer;
+}
+
+static int
+si_data_transfer(register volatile sci_regmap_t *regs,
+	      int maxlen, u_char *data, u_char *status, u_char *msg)
+{
+	int	retlen = 0, xfer, phase;
+
+	regs->sci_icmd = 0;
+
+	*status = 0;
+
+	while (1) {
+
+		WAIT_FOR_REQ(regs);
+
+		phase = SCI_CUR_PHASE(regs->sci_bus_csr);
+
+		switch (phase) {
+			case SCSI_PHASE_CMD:
+				printf("Command phase in data_transfer().\n");
+				return retlen;
+			case SCSI_PHASE_DATA_IN:
+				SCI_ACK(regs,SCSI_PHASE_DATA_IN);
+#if PSEUDO_DMA
+				xfer = sci_pdma_in(regs, SCSI_PHASE_DATA_IN,
+						  	maxlen, data);
+#else
+				xfer = sci_data_in(regs, SCSI_PHASE_DATA_IN,
+						  	maxlen, data);
+#endif
+				retlen += xfer;
+				maxlen -= xfer;
+				break;
+			case SCSI_PHASE_DATA_OUT:
+				SCI_ACK(regs,SCSI_PHASE_DATA_OUT);
+#if PSEUDO_DMA
+				xfer = sci_pdma_out(regs, SCSI_PHASE_DATA_OUT,
+						   	maxlen, data);
+#else
+				xfer = sci_data_out(regs, SCSI_PHASE_DATA_OUT,
+						   	maxlen, data);
+#endif
+				retlen += xfer;
+				maxlen -= xfer;
+				break;
+			case SCSI_PHASE_STATUS:
+				SCI_ACK(regs,SCSI_PHASE_STATUS);
+				sci_data_in(regs, SCSI_PHASE_STATUS,
+					  	1, status);
+				break;
+			case SCSI_PHASE_MESSAGE_IN:
+				SCI_ACK(regs,SCSI_PHASE_MESSAGE_IN);
+				sci_data_in(regs, SCSI_PHASE_MESSAGE_IN,
+					  	1, msg);
+				if (*msg == 0) {
+					return retlen;
+				} else {
+					printf( "message 0x%x in "
+						"data_transfer.\n", *msg);
+				}
+				break;
+			case SCSI_PHASE_MESSAGE_OUT:
+				SCI_ACK(regs,SCSI_PHASE_MESSAGE_OUT);
+				sci_data_out(regs, SCSI_PHASE_MESSAGE_OUT,
+					  	1, msg);
+				break;
+			default:
+				printf( "Unexpected phase 0x%x in "
+					"data_transfer().\n", phase);
+scsi_timeout_error:
+				return retlen;
+				break;
+		}
+	}
+}
+
+static int
+si_dorequest(struct ncr5380_softc *sc,
+	int target, int lun, u_char *cmd, int cmdlen,
+	char *databuf, int datalen, int *sent)
+	/* Returns 0 on success, -1 on internal error, or the status byte */
+{
+	register volatile sci_regmap_t *regs = sc->sc_regs;
+	int	cmd_bytes_sent, r;
+	u_char	stat, msg, c;
+
+#ifdef	DEBUG
+	if (si_debug) {
+		printf("si_dorequest: target=%d, lun=%d\n", target, lun);
+	}
+#endif
+
+	*sent = 0;
+
+	if ( ( r = si_select_target(regs, 7, target, 1) ) != SCSI_RET_SUCCESS) {
+#ifdef	DEBUG
+		if (si_debug) {
+			printf("si_dorequest: select returned %d\n", r);
+		}
+#endif
+
+		SCI_CLR_INTR(regs);
+		switch (r) {
+
+		case SCSI_RET_NEED_RESET:
+			printf("si_dorequest: target=%d, lun=%d, resetting...\n",
+				   target, lun, r);
+			ncr5380_reset_adapter(sc);
+			ncr5380_reset_scsibus(sc);
+			/* fall through */
+		case SCSI_RET_RETRY:
+			return 0x08;	/* Busy - tell common code to retry. */
+
+		default:
+			printf("si_dorequest: target=%d, lun=%d, error=%d.\n",
+				target, lun, r);
+			/* fall through */
+		case SCSI_RET_DEVICE_DOWN:
+			return -1;	/* Dead - tell common code to give up. */
+		}
+	}
+
+	c = 0x80 | lun;
+
+	if ((cmd_bytes_sent = si_command_transfer(regs, cmdlen,
+				(u_char *) cmd, &stat, &c)) != cmdlen)
+	{
+		SCI_CLR_INTR(regs);
+		if (cmd_bytes_sent >= 0) {
+			printf("Data underrun sending CCB (%d bytes of %d, sent).\n",
+				   cmd_bytes_sent, cmdlen);
+		}
+		return -1;
+	}
+
+	*sent = si_data_transfer(regs, datalen, (u_char *)databuf,
+				  &stat, &msg);
+#ifdef	DEBUG
+	if (si_debug) {
+		printf("si_dorequest: data transfered = %d\n", *sent);
+	}
+#endif
+
+	return stat;
+}
+
+static int
+si_generic(int adapter, int id, int lun, struct scsi_generic *cmd,
+  	 int cmdlen, void *databuf, int datalen)
+{
+	register struct ncr5380_softc *sc = sicd.cd_devs[adapter];
+	int i, j, sent;
+
+	if (cmd->opcode == TEST_UNIT_READY)	/* XXX */
+		cmd->bytes[0] = ((u_char) lun << 5);
+
+	i = si_dorequest(sc, id, lun, (u_char *) cmd, cmdlen,
+					 databuf, datalen, &sent);
+
+	return i;
+}
+
+static int
+si_group0(int adapter, int id, int lun, int opcode, int addr, int len,
+		int flags, caddr_t databuf, int datalen)
+{
+	register struct ncr5380_softc *sc = sicd.cd_devs[adapter];
+	unsigned char cmd[6];
+	int i, j, sent;
+
+	cmd[0] = opcode;		/* Operation code           		*/
+	cmd[1] = (lun << 5) | ((addr >> 16) & 0x1F);	/* Lun & MSB of addr	*/
+	cmd[2] = (addr >> 8) & 0xFF;	/* addr					*/
+	cmd[3] = addr & 0xFF;		/* LSB of addr				*/
+	cmd[4] = len;			/* Allocation length			*/
+	cmd[5] = flags;		/* Link/Flag				*/
+
+	i = si_dorequest(sc, id, lun, cmd, 6, databuf, datalen, &sent);
+
+	return i;
+}