Jim Babb's port of the AIC6360 driver.

Submitted by:	babb
Obtained from:  NetBSD

1 files changed, 2659 insertions, 0 deletions

diff --git a/sys/i386/isa/aic6360.c b/sys/i386/isa/aic6360.c
new file mode 100644
index 0000000..cee494c
--- /dev/null
+++ b/sys/i386/isa/aic6360.c
@@ -0,0 +1,2659 @@
+/*
+ * Copyright (c) 1994 Charles Hannum.
+ * Copyright (c) 1994 Jarle Greipsland
+ * 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 Jarle Greipsland
+ * 4. 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.
+ */
+
+/*
+ * $Id$
+ *
+ * Acknowledgements: Many of the algorithms used in this driver are
+ * inspired by the work of Julian Elischer (julian@tfs.com) and
+ * Charles Hannum (mycroft@duality.gnu.ai.mit.edu).  Thanks a million!
+ *
+ * Converted from NetBSD to FreeBSD by Jim Babb
+ */
+
+/* TODO list:
+ * 1) Get the DMA stuff working.
+ * 2) Get the iov/uio stuff working. Is this a good thing ???
+ * 3) Get the synch stuff working. 
+ * 4) Rewrite it to use malloc for the acb structs instead of static alloc.?
+ */
+
+/*
+ * A few customizable items:
+ */
+
+/* The SCSI ID of the host adapter/computer */
+#define AIC_SCSI_HOSTID 7
+
+/* Use doubleword transfers to/from SCSI chip.  Note: This requires 
+ * motherboard support.  Basicly, some motherboard chipsets are able to
+ * split a 32 bit I/O operation into two 16 bit I/O operations,
+ * transparently to the processor.  This speeds up some things, notably long
+ * data transfers.
+ */
+#define AIC_USE_DWORDS 0
+
+/* Allow disconnects?  Was mainly used in an early phase of the driver when
+ * the message system was very flaky.  Should go away soon.
+ */
+#define AIC_ALLOW_DISCONNECT	1
+
+/* Synchronous data transfers? (does not work yet!) XXX */
+#define AIC_USE_SYNCHRONOUS	0 	/* Enable/disable (1/0) */
+#define AIC_SYNC_PERIOD 	200
+#define AIC_SYNC_REQ_ACK_OFS 	8
+
+/* Max attempts made to transmit a message */
+#define AIC_MSG_MAX_ATTEMPT	3 /* Not used now XXX */
+
+/* Use DMA (else we do programmed I/O using string instructions) (not yet!)*/
+#define AIC_USE_EISA_DMA	0
+#define AIC_USE_ISA_DMA		0
+
+/* How to behave on the (E)ISA bus when/if DMAing (on<<4) + off in us */
+#define EISA_BRST_TIM ((15<<4) + 1)	/* 15us on, 1us off */
+
+/* Some spin loop parameters (essentially how long to wait some places)
+ * The problem(?) is that sometimes we expect either to be able to transmit a
+ * byte or to get a new one from the SCSI bus pretty soon.  In order to avoid
+ * returning from the interrupt just to get yanked back for the next byte we
+ * may spin in the interrupt routine waiting for this byte to come.  How long?
+ * This is really (SCSI) device and processor dependent.  Tuneable, I guess.
+ */
+#define AIC_MSGI_SPIN	1 	/* Will spinwait upto ?ms for a new msg byte */
+#define AIC_MSGO_SPIN	1
+
+/* Include debug functions?  At the end of this file there are a bunch of 
+ * functions that will print out various information regarding queued SCSI 
+ * commands, driver state and chip contents.  You can call them from the 
+ * kernel debugger.  If you set AIC_DEBUG to 0 they are not included (the
+ * kernel uses less memory) but you lose the debugging facilities.
+ */
+#define AIC_DEBUG 0
+
+/* End of customizable parameters */
+
+#if AIC_USE_EISA_DMA || AIC_USE_ISA_DMA
+#error "I said not yet! Start paying attention... grumble"
+#endif
+
+#ifdef __FreeBSD__
+#include <aic.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#ifdef __FreeBSD__
+#include <sys/kernel.h>
+#endif
+#include <sys/systm.h>
+#include <sys/errno.h>
+#include <sys/ioctl.h>
+#ifdef __FreeBSD__
+#include <sys/malloc.h>
+#else
+#include <sys/device.h>
+#endif
+#include <sys/buf.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/queue.h>
+#ifndef __FreeBSD__
+#include <machine/pio.h>
+#endif
+#include <scsi/scsi_all.h>
+#include <scsi/scsiconf.h>
+
+#ifdef __FreeBSD__
+#include <i386/isa/isa_device.h>
+
+#include "ddb.h"
+#include "kernel.h"
+#else
+#include <i386/isa/isavar.h>
+#include <i386/isa/icu.h>
+#endif
+
+/* Definitions, most of them has turned out to be unneccesary, but here they
+ * are anyway.
+ */
+
+/*
+ * Generic SCSI messages. For now we reject most of them.
+ */
+/* Messages (1 byte) */		     /* I/T M(andatory) or (O)ptional */
+#define MSG_CMDCOMPLETE		0x00 /* M/M */
+#define MSG_EXTENDED		0x01 /* O/O */
+#define MSG_SAVEDATAPOINTER	0x02 /* O/O */
+#define MSG_RESTOREPOINTERS	0x03 /* O/O */
+#define MSG_DISCONNECT		0x04 /* O/O */
+#define MSG_INITIATOR_DET_ERR	0x05 /* M/M */
+#define MSG_ABORT		0x06 /* O/M */
+#define MSG_MESSAGE_REJECT	0x07 /* M/M */
+#define MSG_NOOP		0x08 /* M/M */
+#define MSG_PARITY_ERR		0x09 /* M/M */
+#define MSG_LINK_CMD_COMPLETE	0x0a /* O/O */
+#define MSG_LINK_CMD_COMPLETEF	0x0b /* O/O */
+#define MSG_BUS_DEV_RESET	0x0c /* O/M */
+#define MSG_ABORT_TAG		0x0d /* O/O */
+#define MSG_CLEAR_QUEUE		0x0e /* O/O */
+#define MSG_INIT_RECOVERY	0x0f /* O/O */
+#define MSG_REL_RECOVERY	0x10 /* O/O */
+#define MSG_TERM_IO_PROC	0x11 /* O/O */
+
+/* Messages (2 byte) */
+#define MSG_SIMPLE_Q_TAG	0x20 /* O/O */
+#define MSG_HEAD_OF_Q_TAG	0x21 /* O/O */
+#define MSG_ORDERED_Q_TAG	0x22 /* O/O */
+#define MSG_IGN_WIDE_RESIDUE	0x23 /* O/O */
+
+/* Identify message */
+#define MSG_IDENTIFY(lun) ((AIC_ALLOW_DISCONNECT ? 0xc0 : 0x80)|((lun) & 0x7))
+#define MSG_ISIDENT(m)		((m) & 0x80)
+
+/* Extended messages (opcode) */
+#define MSG_EXT_SDTR		0x01
+
+/* SCSI Status codes */
+#define ST_GOOD			0x00
+#define ST_CHKCOND		0x02
+#define ST_CONDMET		0x04
+#define ST_BUSY			0x08
+#define ST_INTERMED		0x10
+#define ST_INTERMED_CONDMET	0x14
+#define ST_RESERVATION_CONFLICT	0x18
+#define ST_CMD_TERM		0x22
+#define ST_QUEUE_FULL		0x28
+
+#define ST_MASK			0x3e /* bit 0,6,7 is reserved */
+
+/* AIC6360 definitions */
+#define SCSISEQ		(iobase + 0x00) /* SCSI sequence control */
+#define SXFRCTL0	(iobase + 0x01) /* SCSI transfer control 0 */
+#define SXFRCTL1	(iobase + 0x02) /* SCSI transfer control 1 */
+#define SCSISIGI	(iobase + 0x03) /* SCSI signal in */
+#define SCSISIGO	(iobase + 0x03) /* SCSI signal out */
+#define SCSIRATE	(iobase + 0x04) /* SCSI rate control */
+#define SCSIID		(iobase + 0x05) /* SCSI ID */
+#define SELID		(iobase + 0x05) /* Selection/Reselection ID */
+#define SCSIDAT		(iobase + 0x06) /* SCSI Latched Data */
+#define SCSIBUS		(iobase + 0x07) /* SCSI Data Bus*/
+#define STCNT0		(iobase + 0x08) /* SCSI transfer count */
+#define STCNT1		(iobase + 0x09)
+#define STCNT2		(iobase + 0x0a)
+#define CLRSINT0	(iobase + 0x0b) /* Clear SCSI interrupts 0 */
+#define SSTAT0		(iobase + 0x0b) /* SCSI interrupt status 0 */
+#define CLRSINT1	(iobase + 0x0c) /* Clear SCSI interrupts 1 */
+#define SSTAT1		(iobase + 0x0c) /* SCSI status 1 */
+#define SSTAT2		(iobase + 0x0d) /* SCSI status 2 */
+#define SCSITEST	(iobase + 0x0e) /* SCSI test control */
+#define SSTAT3		(iobase + 0x0e) /* SCSI status 3 */
+#define CLRSERR		(iobase + 0x0f) /* Clear SCSI errors */
+#define SSTAT4		(iobase + 0x0f) /* SCSI status 4 */
+#define SIMODE0		(iobase + 0x10) /* SCSI interrupt mode 0 */
+#define SIMODE1		(iobase + 0x11) /* SCSI interrupt mode 1 */
+#define DMACNTRL0	(iobase + 0x12) /* DMA control 0 */
+#define DMACNTRL1	(iobase + 0x13) /* DMA control 1 */
+#define DMASTAT		(iobase + 0x14) /* DMA status */
+#define FIFOSTAT	(iobase + 0x15) /* FIFO status */
+#define DMADATA		(iobase + 0x16) /* DMA data */
+#define DMADATAL	(iobase + 0x16) /* DMA data low byte */
+#define DMADATAH	(iobase + 0x17) /* DMA data high byte */
+#define BRSTCNTRL	(iobase + 0x18) /* Burst Control */
+#define DMADATALONG	(iobase + 0x18)
+#define PORTA		(iobase + 0x1a) /* Port A */
+#define PORTB		(iobase + 0x1b) /* Port B */
+#define REV		(iobase + 0x1c) /* Revision (001 for 6360) */
+#define STACK		(iobase + 0x1d) /* Stack */
+#define TEST		(iobase + 0x1e) /* Test register */
+#define ID		(iobase + 0x1f) /* ID register */
+
+#define IDSTRING "(C)1991ADAPTECAIC6360           "
+
+/* What all the bits do */
+
+/* SCSISEQ */
+#define TEMODEO		0x80
+#define ENSELO		0x40
+#define ENSELI		0x20
+#define ENRESELI	0x10
+#define ENAUTOATNO	0x08
+#define ENAUTOATNI	0x04
+#define ENAUTOATNP	0x02
+#define SCSIRSTO	0x01
+
+/* SXFRCTL0 */
+#define SCSIEN		0x80
+#define DMAEN		0x40
+#define CHEN		0x20
+#define CLRSTCNT	0x10
+#define SPIOEN		0x08
+#define CLRCH		0x02
+
+/* SXFRCTL1 */
+#define BITBUCKET	0x80
+#define SWRAPEN		0x40
+#define ENSPCHK		0x20
+#define STIMESEL1	0x10
+#define STIMESEL0	0x08
+#define STIMO_256ms	0x00
+#define STIMO_128ms	0x08
+#define STIMO_64ms	0x10
+#define STIMO_32ms	0x18
+#define ENSTIMER	0x04
+#define BYTEALIGN	0x02
+
+/* SCSISIGI */
+#define CDI		0x80
+#define IOI		0x40
+#define MSGI		0x20
+#define ATNI		0x10
+#define SELI		0x08
+#define BSYI		0x04
+#define REQI		0x02
+#define ACKI		0x01
+
+/* Important! The 3 most significant bits of this register, in initiator mode,
+ * represents the "expected" SCSI bus phase and can be used to trigger phase
+ * mismatch and phase change interrupts.  But more important:  If there is a
+ * phase mismatch the chip will not transfer any data!  This is actually a nice
+ * feature as it gives us a bit more control over what is happening when we are
+ * bursting data (in) through the FIFOs and the phase suddenly changes from 
+ * DATA IN to STATUS or MESSAGE IN.  The transfer will stop and wait for the 
+ * proper phase to be set in this register instead of dumping the bits into the
+ * FIFOs.
+ */
+/* SCSISIGO */
+#define CDO		0x80
+#define CDEXP		(CDO)
+#define IOO		0x40
+#define IOEXP		(IOO)
+#define MSGO		0x20
+#define MSGEXP		(MSGO)
+#define ATNO		0x10
+#define SELO		0x08
+#define BSYO		0x04
+#define REQO		0x02
+#define ACKO		0x01
+
+/* Information transfer phases */
+#define PH_DOUT		(0)
+#define PH_DIN		(IOI)
+#define PH_CMD		(CDI)
+#define PH_STAT		(CDI|IOI)
+#define PH_MSGO		(MSGI|CDI)
+#define PH_MSGI		(MSGI|CDI|IOI)
+
+#define PH_MASK		0xe0
+
+/* Some pseudo phases for getphase()*/
+#define PH_BUSFREE	0x100	/* (Re)Selection no longer valid */
+#define PH_INVALID	0x101	/* (Re)Selection valid, but no REQ yet */
+#define PH_PSBIT	0x100	/* "pseudo" bit */
+
+/* SCSIRATE */
+#define SXFR2		0x40
+#define SXFR1		0x20
+#define SXFR0		0x10
+#define SOFS3		0x08
+#define SOFS2		0x04
+#define SOFS1		0x02
+#define SOFS0		0x01
+
+/* SCSI ID */
+#define OID2		0x40
+#define OID1		0x20
+#define OID0		0x10
+#define OID_S		4	/* shift value */
+#define TID2		0x04
+#define TID1		0x02
+#define TID0		0x01
+#define SCSI_ID_MASK	0x7
+
+/* SCSI selection/reselection ID (both target *and* initiator) */
+#define SELID7		0x80
+#define SELID6		0x40
+#define SELID5		0x20
+#define SELID4		0x10
+#define SELID3		0x08
+#define SELID2		0x04
+#define SELID1		0x02
+#define SELID0		0x01
+
+/* CLRSINT0                      Clears what? (interrupt and/or status bit) */
+#define SETSDONE	0x80
+#define CLRSELDO	0x40	/* I */
+#define CLRSELDI	0x20	/* I+ */
+#define CLRSELINGO	0x10	/* I */
+#define CLRSWRAP	0x08	/* I+S */
+#define CLRSDONE	0x04	/* I+S */
+#define CLRSPIORDY	0x02	/* I */
+#define CLRDMADONE	0x01	/* I */
+
+/* SSTAT0                          Howto clear */
+#define TARGET		0x80
+#define SELDO		0x40	/* Selfclearing */
+#define SELDI		0x20	/* Selfclearing when CLRSELDI is set */
+#define SELINGO		0x10	/* Selfclearing */
+#define SWRAP		0x08	/* CLRSWAP */
+#define SDONE		0x04	/* Not used in initiator mode */
+#define SPIORDY		0x02	/* Selfclearing (op on SCSIDAT) */
+#define DMADONE		0x01	/* Selfclearing (all FIFOs empty & T/C */
+
+/* CLRSINT1                      Clears what? */
+#define CLRSELTIMO	0x80	/* I+S */
+#define CLRATNO		0x40
+#define CLRSCSIRSTI	0x20	/* I+S */
+#define CLRBUSFREE	0x08	/* I+S */
+#define CLRSCSIPERR	0x04	/* I+S */
+#define CLRPHASECHG	0x02	/* I+S */
+#define CLRREQINIT	0x01	/* I+S */
+
+/* SSTAT1                       How to clear?  When set?*/
+#define SELTO		0x80	/* C		select out timeout */
+#define ATNTARG		0x40	/* Not used in initiator mode */
+#define SCSIRSTI	0x20	/* C		RST asserted */
+#define PHASEMIS	0x10	/* Selfclearing */
+#define BUSFREE		0x08	/* C		bus free condition */
+#define SCSIPERR	0x04	/* C		parity error on inbound data */
+#define PHASECHG	0x02	/* C	     phase in SCSISIGI doesn't match */
+#define REQINIT		0x01	/* C or ACK	asserting edge of REQ */
+
+/* SSTAT2 */
+#define SOFFSET		0x20
+#define SEMPTY		0x10
+#define SFULL		0x08
+#define SFCNT2		0x04
+#define SFCNT1		0x02
+#define SFCNT0		0x01
+
+/* SCSITEST */
+#define SCTESTU		0x08
+#define SCTESTD		0x04
+#define STCTEST		0x01
+
+/* SSTAT3 */
+#define SCSICNT3	0x80
+#define SCSICNT2	0x40
+#define SCSICNT1	0x20
+#define SCSICNT0	0x10
+#define OFFCNT3		0x08
+#define OFFCNT2		0x04
+#define OFFCNT1		0x02
+#define OFFCNT0		0x01
+
+/* CLRSERR */
+#define CLRSYNCERR	0x04
+#define CLRFWERR	0x02
+#define CLRFRERR	0x01
+
+/* SSTAT4 */
+#define SYNCERR		0x04
+#define FWERR		0x02
+#define FRERR		0x01
+
+/* SIMODE0 */
+#define ENSELDO		0x40
+#define ENSELDI		0x20
+#define ENSELINGO	0x10
+#define	ENSWRAP		0x08
+#define ENSDONE		0x04
+#define ENSPIORDY	0x02
+#define ENDMADONE	0x01
+
+/* SIMODE1 */
+#define ENSELTIMO	0x80
+#define ENATNTARG	0x40
+#define ENSCSIRST	0x20
+#define ENPHASEMIS	0x10
+#define ENBUSFREE	0x08
+#define ENSCSIPERR	0x04
+#define ENPHASECHG	0x02
+#define ENREQINIT	0x01
+
+/* DMACNTRL0 */
+#define ENDMA		0x80
+#define B8MODE		0x40
+#define DMA		0x20
+#define DWORDPIO	0x10
+#define WRITE		0x08
+#define INTEN		0x04
+#define RSTFIFO		0x02
+#define SWINT		0x01
+
+/* DMACNTRL1 */
+#define PWRDWN		0x80
+#define ENSTK32		0x40
+#define STK4		0x10
+#define STK3		0x08
+#define STK2		0x04
+#define STK1		0x02
+#define STK0		0x01
+
+/* DMASTAT */
+#define ATDONE		0x80
+#define WORDRDY		0x40
+#define INTSTAT		0x20
+#define DFIFOFULL	0x10
+#define DFIFOEMP	0x08
+#define DFIFOHF		0x04
+#define DWORDRDY	0x02
+
+/* BRSTCNTRL */
+#define BON3		0x80
+#define BON2		0x40
+#define BON1		0x20
+#define BON0		0x10
+#define BOFF3		0x08
+#define BOFF2		0x04
+#define BOFF1		0x02
+#define BOFF0		0x01
+
+/* TEST */
+#define BOFFTMR		0x40
+#define BONTMR		0x20
+#define STCNTH		0x10
+#define STCNTM		0x08
+#define STCNTL		0x04
+#define SCSIBLK		0x02
+#define DMABLK		0x01
+
+
+#define orreg(reg, val)   outb((reg), inb(reg)| (val))
+#define andreg(reg, val)  outb((reg), inb(reg)& (val))
+#define nandreg(reg, val) outb((reg), inb(reg)&~(val))
+
+
+
+/* Grabbed from Julians SCSI aha-drivers */
+#ifdef	DDB
+int	Debugger();
+#else	DDB
+#define	Debugger() panic("should call debugger here (aic6360.c)")
+#endif	DDB
+
+typedef u_long physaddr;
+
+struct aic_dma_seg {
+	physaddr	addr;
+	long		len;
+};
+
+#ifdef __FreeBSD__
+#define DELAYCOUNT	16
+#else
+extern int delaycount;
+#endif
+
+#define FUDGE(X)	((X)>>1) 	/* get 1 ms spincount */
+#define MINIFUDGE(X)	((X)>>4) 	/* get (approx) 125us spincount */
+#define AIC_NSEG	16
+#define NUM_CONCURRENT	7	/* Only one per target for now */
+
+/* 
+ * ACB. Holds additional information for each SCSI command Comments: We
+ * need a separate scsi command block because we may need to overwrite it
+ * with a request sense command.  Basicly, we refrain from fiddling with
+ * the scsi_xfer struct (except do the expected updating of return values).
+ * We'll generally update: xs->{flags,resid,error,sense,status} and
+ * occasionally xs->retries.
+ */
+
+struct acb {
+	TAILQ_ENTRY(acb) chain;
+	struct scsi_xfer *xs;	/* SCSI xfer ctrl block from above */
+	int		flags;	/* Status */
+#define ACB_FREE	0x00
+#define ACB_ACTIVE	0x01
+#define ACB_DONE	0x04
+#define ACB_CHKSENSE	0x08
+/*	struct aic_dma_seg dma[AIC_NSEG]; */  /* Physical addresses+len */
+	struct scsi_generic cmd;  /* SCSI command block */
+	int	 clen;
+	char	*daddr;		/* Saved data pointer */
+	int	 dleft;		/* Residue */
+	int 	 stat;		/* SCSI status byte */
+};
+
+/* 
+ * Some info about each (possible) target on the SCSI bus.  This should 
+ * probably have been a "per target+lunit" structure, but we'll leave it at 
+ * this for now.  Is there a way to reliably hook it up to sc->fordriver??
+ */
+struct aic_tinfo {
+	int	cmds;		/* #commands processed */
+	int	dconns;		/* #disconnects */
+	int	touts;		/* #timeouts */
+	int	perrs;		/* #parity errors */
+	int	senses;		/* #request sense commands sent */
+	ushort	lubusy;		/* What local units/subr. are busy? */
+	u_char  flags;
+#define NEED_TO_RESET	0x01	/* Should send a BUS_DEV_RESET */
+#define DO_NEGOTIATE	0x02	/* (Re)Negotiate synchronous options */
+#define TARGET_BUSY	0x04	/* Target is busy, i.e. cmd in progress */
+	u_char  persgst;	/* Period suggestion */
+	u_char  offsgst;	/* Offset suggestion */
+	u_char  syncdata;	/* True negotiated synch parameters */
+} tinfo_t;
+
+/* Register a linenumber (for debugging) */
+#if AIC_DEBUG
+#define LOGLINE(p) \
+	do {					\
+		p->history[p->hp] = __LINE__;	\
+		p->hp = ++p->hp % AIC_HSIZE;	\
+	} while (0)
+#else
+#define LOGLINE(p)
+#endif
+
+#ifdef __FreeBSD__
+struct aic_data { /* One of these per adapter */
+#else
+struct aic_softc { /* One of these per adapter */
+	/* Auto config stuff */
+	struct device   sc_dev; /* This one has to go first! */
+	struct isadev   sc_id;
+	struct intrhand sc_ih;
+	struct scsi_link sc_link;       /* prototype for subdevs */
+	int             id_irq;         /* IRQ on the EISA bus */
+	int             id_drq;         /* DRQ on the EISA bus */
+#endif
+	u_short		iobase;		/* Base I/O port */
+#ifdef __FreeBSD__
+	struct scsi_link sc_link;	/* prototype for subdevs */
+	int		aic_int;	/* IRQ on the EISA bus */
+	int		aic_dma;	/* DRQ on the EISA bus */
+#endif
+	/* Lists of command blocks */
+	TAILQ_HEAD(acb_list, acb) free_list, ready_list, nexus_list;
+	struct acb *nexus;	/* current command */
+	/* Command blocks and target info */
+	struct acb acb[NUM_CONCURRENT];
+	struct aic_tinfo tinfo[8];
+	/* Data about the current nexus (updated for every cmd switch) */
+	u_char	*dp;		/* Current data pointer */
+	int	 dleft;		/* Data left to transfer */
+	/* Adapter state */
+	short	 phase;		/* Copy of what bus phase we are in */
+	short	 prevphase;	/* Copy of what bus phase we were in */
+	short	 state;		/* State applicable to the adapter */
+#define AIC_IDLE	0x01
+#define AIC_TMP_UNAVAIL	0x02	/* Don't accept SCSI commands */
+#define AIC_SELECTING	0x03	/* SCSI command is arbiting  */
+#define AIC_RESELECTED	0x04	/* Has been reselected */
+#define AIC_HASNEXUS	0x05	/* Actively using the SCSI bus */
+#define AIC_CLEANING	0x06
+	short	 flags;
+#define AIC_DROP_MSGI	0x01	/* Discard all msgs (parity err detected) */
+#define AIC_DOINGDMA	0x02	/* The FIFO data path is active! */
+#define AIC_BUSFREE_OK	0x04	/* Bus free phase is OK. */
+#define AIC_SYNCHNEGO	0x08	/* Synch negotiation in progress. */
+#define AIC_BLOCKED	0x10	/* Don't schedule new scsi bus operations */
+	/* Debugging stuff */
+#define AIC_HSIZE 8
+	short	history[AIC_HSIZE]; /* Store line numbers here. */
+	short	hp;
+	u_char	progress;	/* Set if interrupt has achieved progress */
+	/* Message stuff */
+	u_char	msgpriq;	/* One or more messages to send (encoded) */
+	u_char	msgout;		/* What message is on its way out? */
+#define SEND_DEV_RESET		0x01
+#define SEND_PARITY_ERROR	0x02
+#define SEND_ABORT		0x04
+#define SEND_REJECT		0x08
+#define SEND_INIT_DET_ERR	0x10
+#define SEND_IDENTIFY  		0x20
+#define SEND_SDTR		0x40
+#define AIC_MAX_MSG_LEN 8
+	u_char  omess[AIC_MAX_MSG_LEN];	/* Scratch area for messages */
+	u_char	*omp;		/* Message pointer (for multibyte messages) */
+	u_char  omlen;
+	u_char	imess[AIC_MAX_MSG_LEN + 1];
+	u_char	*imp;		/* Message pointer (for multibyte messages) */
+	u_char	imlen;
+#ifdef __FreeBSD__
+} *aicdata[NAIC];
+#else
+};
+#endif
+
+#define AIC_SHOWACBS 0x01
+#define AIC_SHOWINTS 0x02
+#define AIC_SHOWCMDS 0x04
+#define AIC_SHOWMISC 0x08
+#define AIC_SHOWTRAC 0x10
+#define AIC_SHOWSTART 0x20
+int aic_debug = 0; /* AIC_SHOWSTART|AIC_SHOWMISC|AIC_SHOWTRAC; */ 
+
+#if AIC_DEBUG
+#define AIC_ACBS(str)  do {if (aic_debug & AIC_SHOWACBS) printf str;} while (0)
+#define AIC_MISC(str)  do {if (aic_debug & AIC_SHOWMISC) printf str;} while (0)
+#define AIC_INTS(str)  do {if (aic_debug & AIC_SHOWINTS) printf str;} while (0)
+#define AIC_TRACE(str) do {if (aic_debug & AIC_SHOWTRAC) printf str;} while (0)
+#define AIC_CMDS(str)  do {if (aic_debug & AIC_SHOWCMDS) printf str;} while (0)
+#define AIC_START(str) do {if (aic_debug & AIC_SHOWSTART) printf str;}while (0)
+#else
+#define AIC_ACBS(str)
+#define AIC_MISC(str)
+#define AIC_INTS(str)
+#define AIC_TRACE(str)
+#define AIC_CMDS(str)
+#define AIC_START(str)
+#endif
+
+#ifdef __FreeBSD__
+int	aicprobe	__P((struct isa_device *));
+int	aicattach	__P((struct isa_device *));
+#else
+int	aicprobe        __P((struct device *, struct device *, void *));
+void	aicattach       __P((struct device *, struct device *, void *));
+#endif
+void	aic_minphys	__P((struct buf *));
+#ifdef __FreeBSD__
+u_int32	aic_adapter_info __P((int));
+int	aicintr		__P((int));
+void 	aic_init	__P((struct aic_data *));
+int 	aic_find	__P((struct aic_data *));
+#else
+u_int	aic_adapter_info __P((struct aic_softc *));
+int	aicintr         __P((struct aic_softc *));
+void	aic_init        __P((struct aic_softc *));
+#endif
+void	aic_done	__P((struct acb *));
+#ifdef __FreeBSD__
+int32	aic_scsi_cmd	__P((struct scsi_xfer *));
+int	aic_poll	__P((int, struct acb *));
+#else
+int	aic_scsi_cmd    __P((struct scsi_xfer *));
+int	aic_poll        __P((struct aic_softc *, struct acb *));
+#endif
+void	aic_add_timeout __P((struct acb *, int));
+void	aic_remove_timeout __P((struct acb *));
+#ifdef __FreeBSD__
+timeout_t aic_timeout;
+void	aic_sched	__P((struct aic_data *));
+void	aic_scsi_reset	__P((struct aic_data *));
+#else
+void	aic_timeout     __P((void *arg));
+int	aic_find        __P((struct aic_softc *));
+void	aic_sched       __P((struct aic_softc *));
+void	aic_scsi_reset  __P((struct aic_softc *));
+#endif
+#if AIC_DEBUG
+void	aic_print_active_acb();
+void	aic_dump_driver();
+void	aic_dump6360();
+#endif
+
+/* Linkup to the rest of the kernel */
+#ifdef __FreeBSD__
+struct isa_driver aicdriver = {
+    aicprobe, aicattach, "aic"
+};
+
+static int aicunit = 0;
+#else
+struct cfdriver aiccd = {
+	NULL, "aic", aicprobe, aicattach, DV_DULL, sizeof(struct aic_softc)
+#endif
+
+struct scsi_adapter aic_switch = {
+	aic_scsi_cmd,
+	aic_minphys,
+	0,
+	0,
+	aic_adapter_info,
+	"aic"
+#ifdef __FreeBSD__
+	,0 , 0
+#endif
+};
+
+struct scsi_device aic_dev = {
+	NULL,			/* Use default error handler */
+	NULL,			/* have a queue, served by this */
+	NULL,			/* have no async handler */
+	NULL,			/* Use default 'done' routine */
+	"aic",
+	0
+};
+
+/* 
+ * INITIALIZATION ROUTINES (probe, attach ++)
+ */
+
+/*
+ * aicprobe: probe for AIC6360 SCSI-controller
+ * returns non-zero value if a controller is found.
+ */
+int 
+#ifdef __FreeBSD__
+aicprobe(dev)
+	struct isa_device *dev;
+#else
+aicprobe(parent, self, aux)
+	struct device *parent, *self;
+	void *aux;
+#endif
+{
+#ifdef __FreeBSD__
+	int	unit = aicunit;
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic = (void *)self;
+	struct isa_attach_args *ia = aux;
+#endif
+	int i, len, ic;
+	
+#ifdef __FreeBSD__
+	if (unit >= NAIC) {
+		printf("aic%d: unit number too high\n", unit);
+		return 0;
+	}
+	dev->id_unit = unit;
+	/*
+	* Allocate a storage area for us
+	*/
+	if (aicdata[unit]) {
+	       printf("aic%d: memory already allocated\n", unit);
+	       return 0;
+	}
+	aic = malloc(sizeof(struct aic_data), M_TEMP, M_NOWAIT);
+	if (!aic) {
+	       printf("aic%d: cannot malloc!\n", unit);
+	       return 0;
+	}
+	bzero(aic, sizeof(struct aic_data));
+	aicdata[unit] = aic;
+	aic->iobase = dev->id_iobase;
+
+	if (aic_find(aic) != 0) {
+		aicdata[unit] = NULL;
+		free(aic, M_TEMP);
+		return 0;
+	}
+	aicunit++;
+	return 0x20;
+#else
+#ifdef NEWCONFIG
+	if (ia->ia_iobase == IOBASEUNK)
+		return 0;
+#endif
+	aic->iobase = ia->ia_iobase;
+	if (aic_find(aic) != 0)
+		return 0;
+#ifdef NEWCONFIG
+	if (ia->ia_irq == IRQUNK)
+		ia->ia_irq = (1 << aic->aic_int);
+	else if (ia->ia_irq != (1 << aic->aic_int)) {
+		printf("aic%d: irq mismatch, %x != %x\n",
+			aic->sc_dev.dv_unit, ia->ia_irq, 1 << aic->aic_int);
+		return 0;
+	}
+
+	if (ia->ia_drq == DRQUNK)
+		ia->ia_drq = aic->aic_dma;
+	else if (ia->ia_drq != aic->aic_dma) {
+		printf("aic%d: drq mismatch, %x != %x\n",
+			aic->sc_dev.dv_unit, ia->ia_drq, aic->aic_dma);
+		return 0;
+#endif
+		}
+	ia->ia_msize = 0;
+	ia->ia_iosize = 0x20;
+	return 1;
+	}
+#endif
+}
+
+/* Do the real search-for-device.  
+ * Prerequisite: aic->iobase should be set to the proper value
+ */
+int
+aic_find(aic)
+#ifdef __FreeBSD__
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+{	
+	u_short iobase = aic->iobase;
+	char chip_id[sizeof(IDSTRING)];	/* For chips that support it */
+	char *start;
+	int i;
+	
+	/* Remove aic6360 from possible powerdown mode */
+	outb(DMACNTRL0, 0);
+
+	/* Thanks to mark@aggregate.com for the new method for detecting 
+	 * whether the chip is present or not.  Bonus: may also work for 
+	 * the AIC-6260!
+ 	 */
+	AIC_TRACE(("aic: probing for aic-chip at port 0x%x\n",(int)iobase));
+ 	/* 
+ 	 * Linux also init's the stack to 1-16 and then clears it,
+     	 *  6260's don't appear to have an ID reg - mpg 
+ 	 */
+	/* Push the sequence 0,1,..,15 on the stack */
+#define STSIZE 16
+	outb(DMACNTRL1, 0);	/* Reset stack pointer */
+	for (i = 0; i < STSIZE; i++)
+		outb(STACK, i);
+
+	/* See if we can pull out the same sequence */
+	outb(DMACNTRL1, 0);
+ 	for (i = 0; i < STSIZE && inb(STACK) == i; i++)
+		;
+	if (i != STSIZE) {
+		AIC_START(("STACK futzed at %d.\n", i));
+		return ENXIO;
+	}
+
+	/* See if we can pull the id string out of the ID register,
+	 * now only used for informational purposes.
+	 */
+	bzero(chip_id, sizeof(chip_id));
+	insb(ID, chip_id, sizeof(IDSTRING)-1);
+	AIC_START(("AIC found at 0x%x ", (int)aic->iobase));
+	AIC_START(("ID: %s ",chip_id));
+	AIC_START(("chip revision %d\n",(int)inb(REV)));
+	return 0;
+}
+
+#ifndef __FreeBSD__
+int
+aicprint()
+{
+}
+#endif
+
+/*
+ * Attach the AIC6360, fill out some high and low level data structures
+ */
+#ifdef __FreeBSD__
+int 
+aicattach(dev)
+	struct isa_device *dev;
+#else
+void
+aicattach(parent, self, aux)
+	struct device *parent, *self;
+	void *aux;
+#endif
+{
+#ifdef __FreeBSD__
+	int unit = dev->id_unit;
+	struct aic_data *aic = aicdata[unit];
+#else
+	struct isa_attach_args *ia = aux;
+	struct aic_softc *aic = (void *)self;
+#endif
+
+	AIC_TRACE(("aicattach\n"));
+	aic->state = 0;
+	aic_scsi_reset(aic);
+	aic_init(aic);	/* Init chip and driver */
+
+	/*
+	 * Fill in the prototype scsi_link
+	 */
+#ifdef __FreeBSD__
+	aic->sc_link.adapter_unit = unit;
+#else
+	aic->sc_link.adapter_softc = aic;
+#endif
+	aic->sc_link.adapter_targ = AIC_SCSI_HOSTID;
+	aic->sc_link.adapter = &aic_switch;
+	aic->sc_link.device = &aic_dev;
+
+#ifdef __FreeBSD__
+	/*
+	 * ask the adapter what subunits are present
+	 */
+	scsi_attachdevs(&(aic->sc_link));
+
+	return 1;
+#else
+	printf("\n");
+#ifdef NEWCONFIG
+	isa_establish(&aic->sc_id, &aic->sc_dev);
+#endif
+	aic->sc_ih.ih_fun = aicintr;
+	aic->sc_ih.ih_arg = aic;
+	aic->sc_ih.ih_level = IPL_BIO;
+	intr_establish(ia->ia_irq, &aic->sc_ih);
+
+	config_found(self, &aic->sc_link, aicprint);
+#endif
+}
+
+
+/* Initialize AIC6360 chip itself
+ * The following conditions should hold:
+ * aicprobe should have succeeded, i.e. the iobase address in aic_data must
+ * be valid.
+ */
+static void 
+aic6360_reset(aic)
+#ifdef __FreeBSD__
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+{
+	u_short iobase = aic->iobase;
+
+	outb(SCSITEST, 0);	/* Doc. recommends to clear these two */
+	outb(TEST, 0);		/* registers before operations commence */
+
+	/* Reset SCSI-FIFO and abort any transfers */
+	outb(SXFRCTL0, CHEN|CLRCH|CLRSTCNT);
+	
+	/* Reset DMA-FIFO */
+	outb(DMACNTRL0, RSTFIFO);
+	outb(DMACNTRL1, 0);
+
+	outb(SCSISEQ, 0);	/* Disable all selection features */
+	outb(SXFRCTL1, 0);
+
+	outb(SIMODE0, 0x00);		/* Disable some interrupts */
+	outb(CLRSINT0, 0x7f);	/* Clear a slew of interrupts */
+
+	outb(SIMODE1, 0x00);		/* Disable some more interrupts */
+	outb(CLRSINT1, 0xef);	/* Clear another slew of interrupts */
+	
+	outb(SCSIRATE, 0);	/* Disable synchronous transfers */
+
+	outb(CLRSERR, 0x07);	/* Haven't seen ant errors (yet) */
+	
+	outb(SCSIID, AIC_SCSI_HOSTID << OID_S); /* Set our SCSI-ID */
+	outb(BRSTCNTRL, EISA_BRST_TIM);
+}
+
+/* Pull the SCSI RST line for 500 us */
+void
+aic_scsi_reset(aic)
+#ifdef __FreeBSD__
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+{
+	u_short iobase = aic->iobase;
+
+	outb(SCSISEQ, SCSIRSTO);
+#ifdef __FreeBSD__
+	DELAY(500);
+#else
+	delay(500);
+#endif
+	outb(SCSISEQ, 0);
+#ifdef __FreeBSD__
+	DELAY(50);
+#else
+	delay(50);
+#endif
+}
+
+/*
+ * Initialize aic SCSI driver, also (conditonally) reset the SCSI bus.
+ * The reinitialization is still buggy (e.g. on SCSI resets).
+ */
+void
+aic_init(aic)
+#ifdef __FreeBSD__
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+{
+	u_short iobase = aic->iobase;
+	struct acb *acb;
+	int r;
+	
+				/* Reset the SCSI-bus itself */
+	aic_scsi_reset(aic);
+
+	aic6360_reset(aic);	/* Clean up our own hardware */
+
+/*XXX*/	/* If not the first time (probably a reset condition),
+	 * we should clean queues with active commands
+	 */
+	if (aic->state == 0) {	/* First time through */
+		TAILQ_INIT(&aic->ready_list);
+		TAILQ_INIT(&aic->nexus_list);
+		TAILQ_INIT(&aic->free_list);
+		aic->nexus = 0;
+		acb = aic->acb;
+		bzero(acb, sizeof(aic->acb));
+		for (r = 0; r < sizeof(aic->acb) / sizeof(*acb); r++) {
+			TAILQ_INSERT_TAIL(&aic->free_list, acb, chain);
+			acb++;
+		}
+		bzero(&aic->tinfo, sizeof(aic->tinfo));
+	} else {
+		aic->state = AIC_CLEANING;
+		if (aic->nexus != NULL) {
+			aic->nexus->xs->error = XS_DRIVER_STUFFUP;
+			untimeout(aic_timeout, (caddr_t)aic->nexus);
+			aic_done(aic->nexus);
+		}
+		aic->nexus = NULL;
+		while (acb = aic->nexus_list.tqh_first) {
+			acb->xs->error = XS_DRIVER_STUFFUP;
+			untimeout(aic_timeout, (caddr_t)acb);
+			aic_done(acb);
+		}
+	}
+	
+	aic->phase = aic->prevphase = PH_INVALID;
+	aic->hp = 0;
+	for (r = 0; r < 7; r++) {
+		struct aic_tinfo *tp = &aic->tinfo[r];
+		tp->flags = AIC_USE_SYNCHRONOUS ? DO_NEGOTIATE : 0;
+		tp->flags |= NEED_TO_RESET;
+		tp->persgst = AIC_SYNC_PERIOD;
+		tp->offsgst = AIC_SYNC_REQ_ACK_OFS;
+		tp->syncdata = 0;
+	}
+	aic->state = AIC_IDLE;
+	outb(DMACNTRL0, INTEN);
+	return;
+}
+
+/*
+ * DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS
+ */
+
+/*
+ * Expected sequence:
+ * 1) Command inserted into ready list
+ * 2) Command selected for execution
+ * 3) Command won arbitration and has selected target device
+ * 4) Send message out (identify message, eventually also sync.negotiations)
+ * 5) Send command
+ * 5a) Receive disconnect message, disconnect.
+ * 5b) Reselected by target
+ * 5c) Receive identify message from target.
+ * 6) Send or receive data
+ * 7) Receive status
+ * 8) Receive message (command complete etc.)
+ * 9) If status == SCSI_CHECK construct a synthetic request sense SCSI cmd.
+ *    Repeat 2-8 (no disconnects please...)
+ */
+
+/*
+ * Start a SCSI-command
+ * This function is called by the higher level SCSI-driver to queue/run
+ * SCSI-commands.
+ */
+#ifdef __FreeBSD__
+int32 
+#else
+int
+#endif
+aic_scsi_cmd(xs)
+	struct scsi_xfer *xs;
+{
+	struct scsi_link *sc = xs->sc_link;
+#ifdef __FreeBSD__
+	int	unit = sc->adapter_unit;
+	struct aic_data *aic = aicdata[unit];
+#else
+	struct aic_softc *aic = sc->adapter_softc;
+#endif
+	struct acb 	*acb;
+	int s = 0;
+	int flags;
+	u_short iobase = aic->iobase;
+	
+	SC_DEBUG(sc, SDEV_DB2, ("aic_scsi_cmd\n"));
+	AIC_TRACE(("aic_scsi_cmd\n"));
+	AIC_MISC(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen, 
+		  sc->target));
+
+	flags = xs->flags;
+
+	/* Get a aic command block */
+	if (!(flags & SCSI_NOMASK)) {
+		/* Critical region */
+		s = splbio();
+		acb = aic->free_list.tqh_first;
+		if (acb) {
+			TAILQ_REMOVE(&aic->free_list, acb, chain);
+		}
+		splx(s);
+	} else {
+		acb = aic->free_list.tqh_first;
+		if (acb) {
+			TAILQ_REMOVE(&aic->free_list, acb, chain);
+		}
+	}
+		
+	if (acb == NULL) {
+		xs->error = XS_DRIVER_STUFFUP;
+		AIC_MISC(("TRY_AGAIN_LATER"));
+		return TRY_AGAIN_LATER;
+	}
+
+	/* Initialize acb */
+	acb->flags = ACB_ACTIVE;
+	acb->xs = xs;
+	bcopy(xs->cmd, &acb->cmd, xs->cmdlen);
+	acb->clen = xs->cmdlen;
+	acb->daddr = xs->data;
+	acb->dleft = xs->datalen;
+	acb->stat = 0;
+	
+	if (!(flags & SCSI_NOMASK))
+		s = splbio();
+
+	TAILQ_INSERT_TAIL(&aic->ready_list, acb, chain);
+	timeout(aic_timeout, (caddr_t)acb, (xs->timeout*hz)/1000);
+
+	if (aic->state == AIC_IDLE)
+		aic_sched(aic);
+
+	if (!(flags & SCSI_NOMASK)) { /* Almost done. Wait outside */
+		splx(s);
+		AIC_MISC(("SUCCESSFULLY_QUEUED"));
+		return SUCCESSFULLY_QUEUED;
+	}
+
+	/* Not allowed to use interrupts, use polling instead */
+#ifdef __FreeBSD__
+	return aic_poll(unit, acb);
+#else
+	return aic_poll(aic, acb);
+#endif
+}
+
+/*
+ * Adjust transfer size in buffer structure
+ */
+void 
+aic_minphys(bp)
+	struct buf *bp;
+{
+
+	AIC_TRACE(("aic_minphys\n"));
+	if (bp->b_bcount > (AIC_NSEG << PGSHIFT))
+		bp->b_bcount = (AIC_NSEG << PGSHIFT);
+}
+
+
+#ifdef __FreeBSD__
+u_int32 
+aic_adapter_info(unit)
+	int	unit;
+#else
+u_int
+aic_adapter_info(aic)
+	struct aic_softc *aic;
+#endif
+{
+
+	AIC_TRACE(("aic_adapter_info\n"));
+	return (2);		/* One outstanding command per target */
+}
+
+/*
+ * Used when interrupt driven I/O isn't allowed, e.g. during boot.
+ */
+int
+#ifdef __FreeBSD__
+aic_poll(unit, acb)
+	int	unit;
+#else
+aic_poll(aic, acb)
+	struct aic_softc *aic;
+#endif
+	struct acb *acb;
+{
+#ifdef __FreeBSD__
+	struct aic_data *aic = aicdata[unit];
+#endif
+	register u_short iobase = aic->iobase;
+	struct scsi_xfer *xs = acb->xs;
+	int count = xs->timeout * 10;
+
+	AIC_TRACE(("aic_poll\n"));
+	while (count) {
+		if (inb(DMASTAT) & INTSTAT)
+#ifdef __FreeBSD__
+			aicintr(unit);
+#else
+			aicintr(aic);
+#endif
+		if (xs->flags & ITSDONE)
+			break;
+#ifdef __FreeBSD__
+		DELAY(100);
+#else
+		delay(100);
+#endif
+		count--;
+	}
+	if (count == 0) {
+		AIC_MISC(("aic_poll: timeout"));
+		aic_timeout((caddr_t)acb);
+	}
+	if (xs->error)
+		return HAD_ERROR;
+	return COMPLETE;
+}
+
+/* LOW LEVEL SCSI UTILITIES */
+
+/* Determine the SCSI bus phase, return either a real SCSI bus phase or some
+ * pseudo phase we use to detect certain exceptions.  This one is a bit tricky.
+ * The bits we peek at:
+ * CDI, MSGI and DI is the 3 SCSI signals determining the bus phase.
+ * These should be qualified by REQI high and ACKI low.
+ * Also peek at SSTAT0[SELDO|SELDI] to detect a passing BUSFREE condition.
+ * No longer detect SCSI RESET or PERR here.  They are tested for separately
+ * in the interrupt handler.
+ * Note: If an exception occur at some critical time during the phase 
+ * determination we'll most likely return something wildly erronous....
+ */
+static inline u_short
+aicphase(aic)
+#ifdef __FreeBSD__
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+{
+	register u_short iobase = aic->iobase;
+	register u_char sstat0, sstat1, scsisig;
+	
+	sstat1 = inb(SSTAT1);	/* Look for REQINIT (REQ asserted) */
+	scsisig = inb(SCSISIGI); /* Get the SCSI bus signals */
+	sstat0 = inb(SSTAT0);	/* Get the selection valid status bits */
+	
+	if (!(inb(SSTAT0) & (SELDO|SELDI))) /* Selection became invalid? */
+		return PH_BUSFREE;
+
+	/* Selection is still valid */
+	if (!(sstat1 & REQINIT)) 		/* REQ not asserted ? */
+		return PH_INVALID;
+
+	/* REQ is asserted, (and ACK is not) */
+	return scsisig & PH_MASK;
+}
+
+
+/* Schedule a scsi operation.  This has now been pulled out of the interrupt
+ * handler so that we may call it from aic_scsi_cmd and aic_done.  This may
+ * save us an unecessary interrupt just to get things going.  Should only be
+ * called when state == AIC_IDLE and at bio pl.
+ */
+void
+aic_sched(aic)
+#ifdef __FreeBSD__
+	register struct aic_data *aic;
+#else
+	register struct aic_softc *aic;
+#endif
+{
+	struct scsi_xfer *xs;
+	struct scsi_link *sc;
+	struct acb *acb;
+	u_short iobase = aic->iobase;
+	int t, l;
+	u_char simode0, simode1, scsiseq;
+	
+	AIC_TRACE(("aic_sched\n"));
+	simode0 = ENSELDI;
+	simode1 = ENSCSIRST|ENSCSIPERR|ENREQINIT;
+	scsiseq = ENRESELI;
+	/*
+	 * Find first acb in rdy queue that is for a target/lunit
+	 * combinations that is not busy.
+	 */
+	outb(CLRSINT1, CLRSELTIMO|CLRBUSFREE|CLRSCSIPERR);
+	for (acb = aic->ready_list.tqh_first; acb; acb = acb->chain.tqe_next) {
+		sc = acb->xs->sc_link;
+		t = sc->target;
+		if (!(aic->tinfo[t].lubusy & (1 << sc->lun))) {
+			TAILQ_REMOVE(&aic->ready_list, acb, chain);
+			aic->nexus = acb;
+			aic->state = AIC_SELECTING;
+			/* 
+			 * Start selection process. Always enable
+			 * reselections.  Note: we don't have a nexus yet, so
+			 * cannot set aic->state = AIC_HASNEXUS.
+			 */
+			simode0 = ENSELDI|ENSELDO;
+			simode1 = ENSCSIRST|ENSCSIPERR|
+				  ENREQINIT|ENSELTIMO;
+			scsiseq = ENRESELI|ENSELO|ENAUTOATNO;
+			outb(SCSIID, AIC_SCSI_HOSTID << OID_S | t);
+			outb(SXFRCTL1, STIMO_256ms|ENSTIMER);
+			outb(CLRSINT0, CLRSELDO);
+			break;
+		}
+#if AIC_DEBUG
+		else
+			AIC_MISC(("%d:%d busy\n", t, sc->lun));
+#endif
+	}
+	AIC_MISC(("%sselecting\n",scsiseq&ENSELO?"":"re"));
+	outb(SIMODE0, simode0);
+	outb(SIMODE1, simode1);
+	outb(SCSISEQ, scsiseq);
+}
+
+
+/*
+ * POST PROCESSING OF SCSI_CMD (usually current)
+ */
+void
+aic_done(acb)
+	struct acb *acb;
+{
+	struct scsi_xfer *xs = acb->xs;
+	struct scsi_link *sc = xs->sc_link;
+#ifdef __FreeBSD__
+	int unit = sc->adapter_unit;
+	struct aic_data *aic = aicdata[unit];
+#else
+	struct aic_softc *aic = sc->adapter_softc;
+#endif
+	u_short iobase = aic->iobase;
+	struct acb *acb2;
+
+	AIC_TRACE(("aic_done "));
+
+	/*
+	 * Now, if we've come here with no error code, i.e. we've kept the 
+	 * initial XS_NOERROR, and the status code signals that we should
+	 * check sense, we'll need to set up a request sense cmd block and 
+	 * push the command back into the ready queue *before* any other 
+	 * commands for this target/lunit, else we lose the sense info.
+	 * We don't support chk sense conditions for the request sense cmd.
+	 */
+	if (xs->error == XS_NOERROR && !(acb->flags & ACB_CHKSENSE)) {
+		if ((acb->stat & ST_MASK)==SCSI_CHECK) {
+			struct scsi_sense *ss = (void *)&acb->cmd;
+			AIC_MISC(("requesting sense "));
+			/* First, save the return values */
+			xs->resid = acb->dleft;
+			xs->status = acb->stat;
+			/* Next, setup a request sense command block */
+			bzero(ss, sizeof(*ss));
+			ss->op_code = REQUEST_SENSE;
+			ss->byte2 = sc->lun << 5;
+			ss->length = sizeof(struct scsi_sense_data);
+			acb->clen = sizeof(*ss);
+			acb->daddr = (char *)&xs->sense;
+			acb->dleft = sizeof(struct scsi_sense_data);
+			acb->flags = ACB_ACTIVE|ACB_CHKSENSE;
+			TAILQ_INSERT_HEAD(&aic->ready_list, acb, chain);
+			aic->tinfo[sc->target].lubusy &= ~(1<<sc->lun);
+			aic->tinfo[sc->target].senses++;
+			if (aic->nexus == acb) {
+				aic->nexus = NULL;
+				aic->state = AIC_IDLE;
+				aic_sched(aic);
+			}
+			return;
+		}
+	}
+	
+	if (xs->flags & SCSI_ERR_OK) {
+		xs->resid = 0;
+		xs->error = XS_NOERROR;
+	} else if (xs->error == XS_NOERROR && (acb->flags & ACB_CHKSENSE)) {
+		xs->error = XS_SENSE;
+	} else {
+		xs->resid = acb->dleft;
+	}
+	xs->flags |= ITSDONE;
+	
+#if AIC_DEBUG
+	if (aic_debug & AIC_SHOWMISC) {
+		printf("err=0x%02x ",xs->error);
+		if (xs->error == XS_SENSE)
+			printf("sense=%2x\n", xs->sense.error_code);
+	}
+	if ((xs->resid || xs->error > XS_SENSE) && aic_debug & AIC_SHOWMISC) {
+		if (xs->resid)
+			printf("aic_done: resid=%d\n", xs->resid);
+		if (xs->error)
+			printf("aic_done: error=%d\n", xs->error);
+	}
+#endif
+
+	/*
+	 * Remove the ACB from whatever queue it's on.  We have to do a bit of
+	 * a hack to figure out which queue it's on.  Note that it is *not*
+	 * necessary to cdr down the ready queue, but we must cdr down the
+	 * nexus queue and see if it's there, so we can mark the unit as no
+	 * longer busy.  This code is sickening, but it works.
+	 */
+	if (acb == aic->nexus) {
+		aic->state = AIC_IDLE;
+		aic->tinfo[sc->target].lubusy &= ~(1<<sc->lun);
+		aic_sched(aic);
+	} else if (aic->ready_list.tqh_last == &acb->chain.tqe_next) {
+		TAILQ_REMOVE(&aic->ready_list, acb, chain);
+	} else {
+		register struct acb *acb2;
+		for (acb2 = aic->nexus_list.tqh_first; acb2;
+		    acb2 = acb2->chain.tqe_next)
+			if (acb2 == acb) {
+				TAILQ_REMOVE(&aic->nexus_list, acb, chain);
+				aic->tinfo[sc->target].lubusy &= ~(1<<sc->lun);
+				/* XXXX Should we call aic_sched() here? */
+				break;
+			}
+		if (acb2)
+			;
+		else if (acb->chain.tqe_next) {
+			TAILQ_REMOVE(&aic->ready_list, acb, chain);
+		} else {
+#ifdef __FreeBSD__
+			printf("aic%d: can't find matching acb\n", unit);
+#else
+			printf("%s: can't find matching acb\n",
+			    aic->sc_dev.dv_xname);
+#endif
+			Debugger();
+		}
+	}
+	/* Put it on the free list. */
+	acb->flags = ACB_FREE;
+	TAILQ_INSERT_HEAD(&aic->free_list, acb, chain);
+
+	aic->tinfo[sc->target].cmds++;
+	scsi_done(xs);
+	return;
+}
+
+/*
+ * INTERRUPT/PROTOCOL ENGINE
+ */
+
+/* The message system:
+ * This is a revamped message system that now should easier accomodate new
+ * messages, if necessary.
+ * Currently we accept these messages:
+ * IDENTIFY (when reselecting)
+ * COMMAND COMPLETE # (expect bus free after messages marked #)
+ * NOOP
+ * MESSAGE REJECT
+ * SYNCHRONOUS DATA TRANSFER REQUEST
+ * SAVE DATA POINTER
+ * RESTORE POINTERS
+ * DISCONNECT #
+ *
+ * We may send these messages in prioritized order:
+ * BUS DEVICE RESET #		if SCSI_RESET & xs->flags (or in weird sits.)
+ * MESSAGE PARITY ERROR		par. err. during MSGI
+ * MESSAGE REJECT		If we get a message we don't know how to handle
+ * ABORT #			send on errors
+ * INITIATOR DETECTED ERROR	also on errors (SCSI2) (during info xfer)
+ * IDENTIFY			At the start of each transfer
+ * SYNCHRONOUS DATA TRANSFER REQUEST	if appropriate
+ * NOOP				if nothing else fits the bill ...
+ */
+
+#define aic_sched_msgout(m) \
+	do {				\
+		orreg(SCSISIGO, ATNO);	\
+		aic->msgpriq |= (m);	\
+	} while (0)
+
+#define IS1BYTEMSG(m) (((m) != 1 && (m) < 0x20) || (m) >= 0x80)
+#define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20)
+#define ISEXTMSG(m) ((m) == 1)
+/* Precondition:
+ * The SCSI bus is already in the MSGI phase and there is a message byte
+ * on the bus, along with an asserted REQ signal.
+ */
+static void
+aic_msgin(aic)
+#ifdef __FreeBSD__
+	register struct aic_data *aic;
+#else
+	register struct aic_softc *aic;
+#endif
+{
+	register u_short iobase = aic->iobase;
+	int spincount, extlen;
+	u_char sstat1;
+	
+	AIC_TRACE(("aic_msgin "));
+	outb(SCSISIGO, PH_MSGI);
+	/* Prepare for a new message.  A message should (according to the SCSI
+	 * standard) be transmitted in one single message_in phase.  
+	 * If we have been in some other phase, then this is a new message.
+	 */
+	if (aic->prevphase != PH_MSGI) {
+		aic->flags &= ~AIC_DROP_MSGI;
+		aic->imlen = 0;
+	}
+	/* 
+	 * Read a whole message but the last byte.  If we shall reject the 
+	 * message, we shall have to do it, by asserting ATNO, during the
+	 * message transfer phase itself.
+	 */
+	for (;;) {
+		sstat1 = inb(SSTAT1);
+		/* If parity errors just dump everything on the floor, also
+		 * a parity error automatically sets ATNO
+		 */
+		if (sstat1 & SCSIPERR) {
+			aic_sched_msgout(SEND_PARITY_ERROR);
+			aic->flags |= AIC_DROP_MSGI;
+		}
+		/*
+		 * If we're going to reject the message, don't bother storing
+		 * the incoming bytes.  But still, we need to ACK them.
+		 */
+		if (!(aic->flags & AIC_DROP_MSGI)) {
+			/* Get next message byte */
+			aic->imess[aic->imlen] = inb(SCSIDAT);
+			/* 
+			 * This testing is suboptimal, but most messages will
+			 * be of the one byte variety, so it should not effect
+			 * performance significantly.
+			 */
+			if (IS1BYTEMSG(aic->imess[0]))
+				break;
+			if (IS2BYTEMSG(aic->imess[0]) && aic->imlen == 1)
+				break;
+			if (ISEXTMSG(aic->imess[0]) && aic->imlen > 0) {
+				if (aic->imlen == AIC_MAX_MSG_LEN) {
+					aic->flags |= AIC_DROP_MSGI;
+					aic_sched_msgout(SEND_REJECT);
+				}
+				extlen = aic->imess[1] ? aic->imess[1] : 256;
+				if (aic->imlen == extlen + 2)
+					break; /* Got it all */
+			}
+		}
+		/* If we reach this spot we're either:
+		 * a) in the middle of a multi-byte message or
+		 * b) we're dropping bytes
+		 */
+		outb(SXFRCTL0, CHEN|SPIOEN);
+		inb(SCSIDAT); /* Really read it (ACK it, that is) */
+		outb(SXFRCTL0, CHEN);
+		aic->imlen++;
+
+		/*
+		 * We expect the bytes in a multibyte message to arrive 
+		 * relatively close in time, a few microseconds apart.
+		 * Therefore we will spinwait for some small amount of time
+		 * waiting for the next byte.
+		 */
+#ifdef __FreeBSD__
+		spincount = DELAYCOUNT * AIC_MSGI_SPIN;
+#else
+		spincount = MINIFUDGE(delaycount) * AIC_MSGI_SPIN;
+#endif
+		LOGLINE(aic);
+		while (spincount-- && !((sstat1 = inb(SSTAT1)) & REQINIT))
+			;
+		if (spincount == -1 || sstat1 & (PHASEMIS|BUSFREE))
+			return;
+	}
+	/* Now we should have a complete message (1 byte, 2 byte and moderately
+	 * long extended messages).  We only handle extended messages which 
+	 * total length is shorter than AIC_MAX_MSG_LEN.  Longer messages will
+	 * be amputated.  (Return XS_BOBBITT ?)
+	 */
+	if (aic->state == AIC_HASNEXUS) {
+		struct acb *acb = aic->nexus;
+		struct aic_tinfo *ti = &aic->tinfo[acb->xs->sc_link->target];
+		int offs, per, rate;
+
+		outb(SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE|ENSCSIPERR);
+		switch (aic->imess[0]) {
+		case MSG_CMDCOMPLETE:
+			if (!acb) {
+				aic_sched_msgout(SEND_ABORT);
+				printf("aic: CMDCOMPLETE but no command?\n");
+				break;
+			}
+			if (aic->dleft < 0) {
+				struct scsi_link *sc = acb->xs->sc_link;
+				printf("aic: %d extra bytes from %d:%d\n",
+				    -aic->dleft, sc->target, sc->lun);
+				acb->dleft = 0;
+			}
+			acb->xs->resid = acb->dleft = aic->dleft;
+			aic->flags |= AIC_BUSFREE_OK;
+			untimeout(aic_timeout, (caddr_t)acb);
+			aic_done(acb);
+			break;
+		case MSG_MESSAGE_REJECT:
+			if (aic_debug & AIC_SHOWMISC)
+				printf("aic: our msg rejected by target\n");
+			if (aic->flags & AIC_SYNCHNEGO) {
+				ti->syncdata = 0;
+				ti->persgst = ti->offsgst = 0;
+				aic->flags &= ~AIC_SYNCHNEGO;
+				ti->flags &= ~DO_NEGOTIATE;
+			}
+			/* Not all targets understand INITIATOR_DETECTED_ERR */
+			if (aic->msgout == SEND_INIT_DET_ERR)
+				aic_sched_msgout(SEND_ABORT);
+			break;
+		case MSG_NOOP:	/* Will do! Immediately, sir!*/
+			break;	/* Hah, that was easy! */
+		case MSG_DISCONNECT:
+			if (!acb) {
+				aic_sched_msgout(SEND_ABORT);
+				printf("aic: nothing to DISCONNECT\n");
+				break;
+			}
+			ti->dconns++;
+			TAILQ_INSERT_HEAD(&aic->nexus_list, acb, chain);
+			acb = aic->nexus = NULL;
+			aic->state = AIC_IDLE;
+			aic->flags |= AIC_BUSFREE_OK;
+			break;
+		case MSG_SAVEDATAPOINTER:
+			if (!acb) {
+				aic_sched_msgout(SEND_ABORT);
+				printf("aic: no DATAPOINTERs to save\n");
+				break;
+			}
+			acb->dleft = aic->dleft;
+			acb->daddr = aic->dp;
+			break;
+		case MSG_RESTOREPOINTERS:
+			if (!acb) {
+				aic_sched_msgout(SEND_ABORT);
+				printf("aic: no DATAPOINTERs to restore\n");
+				break;
+			}
+			aic->dp = acb->daddr;
+			aic->dleft = acb->dleft;
+			break;
+		case MSG_EXTENDED:
+			switch (aic->imess[2]) {
+			case MSG_EXT_SDTR:
+				per = aic->imess[3] * 4;
+				rate = (per + 49 - 100)/50;
+				offs = aic->imess[4];
+				if (offs == 0)
+					ti->syncdata = 0;
+				else if (rate > 7) {
+					/* Too slow for aic6360. Do asynch
+					 * instead.  Renegotiate the deal.
+					 */
+					ti->persgst = 0;
+					ti->offsgst = 0;
+					aic_sched_msgout(SEND_SDTR);
+				} else {
+					rate = rate<<4 | offs;
+					ti->syncdata = rate;
+				}
+				break;
+			default: /* Extended messages we don't handle */
+				aic_sched_msgout(SEND_REJECT);
+				break;
+			}
+			break;
+		default:
+			aic_sched_msgout(SEND_REJECT);
+			break;
+		}
+	} else if (aic->state == AIC_RESELECTED) {
+		struct scsi_link *sc;
+		struct acb *acb;
+		u_char selid, lunit;
+		/*
+		 * Which target is reselecting us? (The ID bit really)
+		 */
+		selid = inb(SELID) & ~(1<<AIC_SCSI_HOSTID);
+		if (MSG_ISIDENT(aic->imess[0])) { 	/* Identify? */
+			AIC_MISC(("searching "));
+			/* Search wait queue for disconnected cmd
+			 * The list should be short, so I haven't bothered with
+			 * any more sophisticated structures than a simple
+			 * singly linked list. 
+			 */
+			lunit = aic->imess[0] & 0x07;
+			for (acb = aic->nexus_list.tqh_first; acb;
+			    acb = acb->chain.tqe_next) {
+				sc = acb->xs->sc_link;
+				if (sc->lun == lunit &&
+				    selid == (1<<sc->target)) {
+					TAILQ_REMOVE(&aic->nexus_list, acb,
+					    chain);
+					break;
+				}
+			}
+			if (!acb) { /* Invalid reselection! */
+				aic_sched_msgout(SEND_ABORT);
+				printf("aic: invalid reselect (idbit=0x%2x)\n",
+				    selid);
+			} else { /* Reestablish nexus */
+				/* Setup driver data structures and
+				 * do an implicit RESTORE POINTERS
+				 */
+				aic->nexus = acb;
+				aic->dp = acb->daddr;
+				aic->dleft = acb->dleft;
+				aic->tinfo[sc->target].lubusy |= (1<<sc->lun);
+				outb(SCSIRATE,aic->tinfo[sc->target].syncdata);
+				AIC_MISC(("... found acb"));
+				aic->state = AIC_HASNEXUS;
+			}
+		} else {
+			printf("aic: bogus reselect (no IDENTIFY) %0x2x\n",
+			    selid);
+			aic_sched_msgout(SEND_DEV_RESET);
+		}
+	} else { /* Neither AIC_HASNEXUS nor AIC_RESELECTED! */
+		printf("aic: unexpected message in; will send DEV_RESET\n");
+		aic_sched_msgout(SEND_DEV_RESET);
+	}
+	/* Must not forget to ACK the last message byte ... */
+	outb(SXFRCTL0, CHEN|SPIOEN);
+	inb(SCSIDAT);
+	outb(SXFRCTL0, CHEN);
+	outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+}
+
+
+/* The message out (and in) stuff is a bit complicated:
+ * If the target requests another message (sequence) without 
+ * having changed phase in between it really asks for a 
+ * retransmit, probably due to parity error(s).
+ * The following messages can be sent:
+ * IDENTIFY	   @ These 3 stems from scsi command activity 
+ * BUS_DEV_RESET   @
+ * IDENTIFY + SDTR @
+ * MESSAGE_REJECT if MSGI doesn't make sense
+ * MESSAGE_PARITY_ERROR if MSGI spots a parity error
+ * NOOP if asked for a message and there's nothing to send
+ */
+static void
+aic_msgout(aic)
+#ifdef __FreeBSD__
+	register struct aic_data *aic;
+#else
+	register struct aic_softc *aic;
+#endif
+{
+	register u_short iobase = aic->iobase;
+	struct aic_tinfo *ti;
+	struct acb *acb;
+	u_char dmastat, scsisig;
+
+	/* First determine what to send. If we haven't seen a 
+	 * phasechange this is a retransmission request.
+	 */
+	outb(SCSISIGO, PH_MSGO);
+	if (aic->prevphase != PH_MSGO) { /* NOT a retransmit */
+		/* Pick up highest priority message */
+		aic->msgout = aic->msgpriq & -aic->msgpriq; /* What message? */
+		aic->omlen = 1;	/* "Default" message len */
+		switch (aic->msgout) {
+		case SEND_SDTR:	/* Also implies an IDENTIFY message */
+			acb = aic->nexus;
+			ti = &aic->tinfo[acb->xs->sc_link->target];
+			aic->omess[1] = MSG_EXTENDED;
+			aic->omess[2] = 3;
+			aic->omess[3] = MSG_EXT_SDTR;
+			aic->omess[4] = ti->persgst >> 2;
+			aic->omess[5] = ti->offsgst;
+			aic->omlen = 6;
+			/* Fallthrough! */
+		case SEND_IDENTIFY:
+			if (aic->state != AIC_HASNEXUS) {
+				printf("aic at line %d: no nexus", __LINE__);
+				Debugger();
+			}
+			acb = aic->nexus;
+			aic->omess[0] = MSG_IDENTIFY(acb->xs->sc_link->lun);
+			break;
+		case SEND_DEV_RESET:
+			aic->omess[0] = MSG_BUS_DEV_RESET;
+			aic->flags |= AIC_BUSFREE_OK;
+			break;
+		case SEND_PARITY_ERROR:
+			aic->omess[0] = MSG_PARITY_ERR;
+			break;
+		case SEND_ABORT:
+			aic->omess[0] = MSG_ABORT;
+			aic->flags |= AIC_BUSFREE_OK;
+			break;
+		case SEND_INIT_DET_ERR:
+			aic->omess[0] = MSG_INITIATOR_DET_ERR;
+			break;
+		case SEND_REJECT:
+			aic->omess[0] = MSG_MESSAGE_REJECT;
+			break;
+		default:
+			aic->omess[0] = MSG_NOOP;
+			break;
+		}
+		aic->omp = aic->omess;
+	} else if (aic->omp == &aic->omess[aic->omlen]) {
+		/* Have sent the message at least once, this is a retransmit.  
+		 */
+		AIC_MISC(("retransmitting "));
+		if (aic->omlen > 1)
+			outb(SCSISIGO, PH_MSGO|ATNO);
+	}
+	/* else, we're in the middle of a multi-byte message */
+	outb(SXFRCTL0, CHEN|SPIOEN);
+	outb(DMACNTRL0, INTEN|RSTFIFO);
+	outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+	do {
+		LOGLINE(aic);
+		do {
+			aic->phase = aicphase(aic);
+		} while (aic->phase == PH_INVALID);
+		if (aic->phase != PH_MSGO)
+			/* Target left MSGO, possibly to reject our
+			 * message
+			 */
+			break;
+		/* Clear ATN before last byte */
+		if (aic->omp == &aic->omess[aic->omlen-1])
+			outb(CLRSINT1, CLRATNO);
+		outb(SCSIDAT, *aic->omp++);	/* Send MSG */
+		LOGLINE(aic);
+		while (inb(SCSISIGI) & ACKO)
+			;
+	} while (aic->omp != &aic->omess[aic->omlen]);
+	aic->progress = aic->omp != aic->omess;
+	/* We get here in two ways: 
+	 * a) phase != MSGO.  Target is probably going to reject our message
+	 * b) aic->omp == &aic->omess[aic->omlen], i.e. the message has been
+	 *    transmitted correctly and accepted by the target.
+	 */
+	if (aic->phase == PH_MSGO) {	/* Message accepted by target! */
+		aic->msgpriq &= ~aic->msgout;
+		aic->msgout = 0;
+	}
+	outb(SXFRCTL0, CHEN);	/* Disable SPIO */
+	outb(SIMODE0, 0); /* Setup interrupts before leaving */
+	outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+	/* Enabled ints: SCSIPERR, SCSIRSTI (unexpected)
+	 * 		 REQINIT (expected) BUSFREE (possibly expected)
+	 */
+}
+
+/* aic_dataout: perform a data transfer using the FIFO datapath in the aic6360
+ * Precondition: The SCSI bus should be in the DOUT phase, with REQ asserted
+ * and ACK deasserted (i.e. waiting for a data byte)
+ * This new revision has been optimized (I tried) to make the common case fast,
+ * and the rarer cases (as a result) somewhat more comlex
+ */
+void
+aic_dataout(aic)
+	register struct aic_data *aic;
+{
+	register u_short iobase = aic->iobase;
+	register u_char dmastat;
+	struct acb *acb = aic->nexus;
+	int amount, olddleft = aic->dleft;
+#define DOUTAMOUNT 128		/* Full FIFO */
+
+	/* Enable DATA OUT transfers */
+	outb(SCSISIGO, PH_DOUT);
+	outb(CLRSINT1, CLRPHASECHG);
+	/* Clear FIFOs and counters */
+	outb(SXFRCTL0, CHEN|CLRSTCNT|CLRCH);
+	outb(DMACNTRL0, WRITE|INTEN|RSTFIFO);
+	/* Enable FIFOs */
+	outb(SXFRCTL0, SCSIEN|DMAEN|CHEN);
+	outb(DMACNTRL0, ENDMA|DWORDPIO|WRITE|INTEN);
+
+	/* Setup to detect:
+	 * PHASEMIS & PHASECHG: target has left the DOUT phase
+	 * SCSIRST: something just pulled the RST line.
+	 * BUSFREE: target has unexpectedly left the DOUT phase
+	 */
+	outb(SIMODE1, ENPHASEMIS|ENSCSIRST|ENBUSFREE|ENPHASECHG);
+
+	/* I have tried to make the main loop as tight as possible.  This
+	 * means that some of the code following the loop is a bit more 
+	 * complex than otherwise.
+	 */
+	while (aic->dleft) {
+		int xfer;
+
+		LOGLINE(aic);
+
+		for (;;) {
+			dmastat = inb(DMASTAT);
+			if (dmastat & DFIFOEMP)
+				break;
+			if (dmastat & INTSTAT)
+				goto phasechange;
+		}
+
+		xfer = min(DOUTAMOUNT, aic->dleft);
+
+#if AIC_USE_DWORDS
+		if (xfer >= 12) {
+			outsl(DMADATALONG, aic->dp, xfer/4);
+			aic->dleft -= xfer & ~3;
+			aic->dp += xfer & ~3;
+			xfer &= 3;
+		}
+#else
+		if (xfer >= 8) {
+			outsw(DMADATA, aic->dp, xfer/2);
+			aic->dleft -= xfer & ~1;
+			aic->dp += xfer & ~1;
+			xfer &= 1;
+		}
+#endif
+
+		if (xfer) {
+			outb(DMACNTRL0, ENDMA|B8MODE|INTEN);
+			outsb(DMADATA, aic->dp, xfer);
+			aic->dleft -= xfer;
+			aic->dp += xfer;
+			outb(DMACNTRL0, ENDMA|DWORDPIO|INTEN);
+		}
+	}
+
+	/* See the bytes off chip */
+	for (;;) {
+		dmastat = inb(DMASTAT);
+		if ((dmastat & DFIFOEMP) && (inb(SSTAT2) & SEMPTY))
+			break;
+		if (dmastat & INTSTAT)
+			goto phasechange;
+	}
+
+phasechange:
+	/* We now have the data off chip.  */
+	outb(SXFRCTL0, CHEN);
+
+	if (dmastat & INTSTAT) { /* Some sort of phasechange */
+		register u_char sstat2;
+		/* Stop transfers, do some accounting */
+		amount = inb(FIFOSTAT);
+		sstat2 = inb(SSTAT2);
+		if ((sstat2 & 7) == 0)
+			amount += sstat2 & SFULL ? 8 : 0;
+		else
+			amount += sstat2 & 7;
+		aic->dleft += amount;
+		aic->dp -= amount;
+		AIC_MISC(("+%d ", amount));
+	}
+	
+	outb(DMACNTRL0, RSTFIFO|INTEN);
+	LOGLINE(aic);
+	while (inb(SXFRCTL0) & SCSIEN)
+		;
+	outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+	/* Enabled ints: BUSFREE, SCSIPERR, SCSIRSTI (unexpected)
+	 * 		 REQINIT (expected)
+	 */
+	aic->progress = olddleft != aic->dleft;
+	return;
+}
+
+/* aic_datain: perform data transfers using the FIFO datapath in the aic6360
+ * Precondition: The SCSI bus should be in the DIN phase, with REQ asserted
+ * and ACK deasserted (i.e. at least one byte is ready).
+ * For now, uses a pretty dumb algorithm, hangs around until all data has been
+ * transferred.  This, is OK for fast targets, but not so smart for slow 
+ * targets which don't disconnect or for huge transfers.
+ */
+void
+aic_datain(aic)
+#ifdef __FreeBSD__
+	register struct aic_data *aic;
+#else
+	register struct aic_softc *aic;
+#endif
+{
+	register u_short iobase = aic->iobase;
+	register u_char dmastat;
+	struct acb *acb = aic->nexus;
+	int amount, olddleft = aic->dleft;
+#define DINAMOUNT 128		/* Default amount of data to transfer */
+	
+	/* Enable DATA IN transfers */
+	outb(SCSISIGO, PH_DIN);
+	outb(CLRSINT1, CLRPHASECHG);
+	/* Clear FIFOs and counters */
+	outb(SXFRCTL0, CHEN|CLRSTCNT|CLRCH);
+	outb(DMACNTRL0, INTEN|RSTFIFO);
+	/* Enable FIFOs */
+	outb(SXFRCTL0, SCSIEN|DMAEN|CHEN);
+	outb(DMACNTRL0, ENDMA|DWORDPIO|INTEN);
+
+	outb(SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE|ENPHASECHG);
+
+	/* We leave this loop if one or more of the following is true:
+	 * a) phase != PH_DIN && FIFOs are empty
+	 * b) SCSIRSTI is set (a reset has occurred) or busfree is detected.
+	 */
+	while (aic->dleft) {
+		int done = 0;
+		int xfer;
+
+		LOGLINE(aic);
+
+		/* Wait for fifo half full or phase mismatch */
+		for (;;) {
+			dmastat = inb(DMASTAT);
+			if (dmastat & (DFIFOFULL|INTSTAT))
+				break;
+		}
+
+		if (dmastat & DFIFOFULL)
+			xfer = DINAMOUNT;
+		else {
+			while ((inb(SSTAT2) & SEMPTY) == 0)
+				;
+			xfer = inb(FIFOSTAT);
+			done = 1;
+		}
+
+		xfer = min(xfer, aic->dleft);
+
+#if AIC_USE_DWORDS
+		if (xfer >= 12) {
+			insl(DMADATALONG, aic->dp, xfer/4);
+			aic->dleft -= xfer & ~3;
+			aic->dp += xfer & ~3;
+			xfer &= 3;
+		}
+#else
+		if (xfer >= 8) {
+			insw(DMADATA, aic->dp, xfer/2);
+			aic->dleft -= xfer & ~1;
+			aic->dp += xfer & ~1;
+			xfer &= 1;
+		}
+#endif
+
+		if (xfer) {
+			outb(DMACNTRL0, ENDMA|B8MODE|INTEN);
+			insb(DMADATA, aic->dp, xfer);
+			aic->dleft -= xfer;
+			aic->dp += xfer;
+			outb(DMACNTRL0, ENDMA|DWORDPIO|INTEN);
+		}
+
+		if (done)
+			break;
+	}
+
+#if 0
+	if (aic->dleft)
+		printf("residual of %d\n", aic->dleft);
+#endif
+
+	aic->progress = olddleft != aic->dleft;
+	/* Some SCSI-devices are rude enough to transfer more data than what
+	 * was requested, e.g. 2048 bytes from a CD-ROM instead of the 
+	 * requested 512.  Test for progress, i.e. real transfers.  If no real
+	 * transfers have been performed (acb->dleft is probably already zero)
+	 * and the FIFO is not empty, waste some bytes....
+	 */
+	if (!aic->progress) {
+		int extra = 0;
+		LOGLINE(aic);
+
+		for (;;) {
+			dmastat = inb(DMASTAT);
+			if (dmastat & DFIFOEMP)
+				break;
+			(void) inb(DMADATA); /* Throw it away */
+			extra++;
+		}
+
+		AIC_MISC(("aic: %d extra bytes from %d:%d\n", extra,
+		    acb->xs->sc_link->target, acb->xs->sc_link->lun));
+		aic->progress = extra;
+	}
+
+	/* Stop the FIFO data path */
+	outb(SXFRCTL0, CHEN);
+
+	outb(DMACNTRL0, RSTFIFO|INTEN);
+	/* Come back when REQ is set again */
+	outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+	LOGLINE(aic);
+}
+
+
+/*
+ * This is the workhorse routine of the driver.
+ * Deficiencies (for now):
+ * 1) always uses programmed I/O
+ * 2) doesn't support synchronous transfers properly (yet)
+ */
+
+int 
+#ifdef __FreeBSD__
+aicintr(int unit)
+#else
+aicintr(aic)
+	register struct aic_softc *aic;
+#endif
+{
+#ifdef __FreeBSD__
+	struct aic_data *aic = aicdata[unit];
+#else
+	struct scsi_xfer *xs;
+#endif
+	register struct acb *acb;
+	register struct scsi_link *sc;
+	register u_short iobase = aic->iobase;
+	struct aic_tinfo *ti;
+	int done, amount;
+	u_char sstat0, sstat1, scsisig, dmastat, sstat2;
+	u_char scsiseq, simode0, simode1, sxfrctl0;
+
+
+	LOGLINE(aic);
+	/* Clear INTEN.  This is important if we're running with edge 
+	 * triggered interrupts as we don't guarantee that all interrupts will
+	 * be served during one single invocation of this routine, i.e. we may
+	 * need another edge.
+	 */
+	outb(DMACNTRL0, 0);
+	AIC_TRACE(("aicintr\n"));
+	
+	/*
+	 * 1st check for abnormal conditions, such as reset or parity errors
+	 */
+	sstat1 = inb(SSTAT1);
+	AIC_MISC(("s1:0x%02x ", sstat1));
+	if (sstat1 & (SCSIRSTI|SCSIPERR)) {
+		if (sstat1 & SCSIRSTI) {
+			printf("aic: reset in -- reinitializing....\n");
+			aic_init(aic); /* Restart everything */
+			LOGLINE(aic);
+			outb(DMACNTRL0, INTEN);
+			return 1;
+		} else {
+			printf("aic: SCSI bus parity error\n");
+			outb(CLRSINT1, CLRSCSIPERR);
+			if (aic->prevphase == PH_MSGI)
+				aic_sched_msgout(SEND_PARITY_ERROR);
+			else 
+				aic_sched_msgout(SEND_INIT_DET_ERR);
+		}
+	}
+
+	/* 
+	 * If we're not already busy doing something test for the following
+	 * conditions:
+	 * 1) We have been reselected by something
+	 * 2) We have selected something successfully
+	 * 3) Our selection process has timed out
+	 * 4) This is really a bus free interrupt just to get a new command 
+	 *    going?
+	 * 5) Spurious interrupt?
+	 */
+	sstat0 = inb(SSTAT0);
+	AIC_MISC(("s0:0x%02x ", sstat0));
+	if (aic->state != AIC_HASNEXUS) { /* No nexus yet */
+		if (sstat0 & SELDI) {
+			LOGLINE(aic);
+			/* We have been reselected. Things to do:
+			 * a) If we're trying to select something ourselves
+			 *    back off the current command.
+			 * b) "Wait" for a message in phase (IDENTIFY)
+			 * c) Call aic_msgin() to get the identify message and
+			 *    retrieve the disconnected command from the wait
+			 *    queue.
+			 */
+			AIC_MISC(("reselect "));
+			/* If we're trying to select a target ourselves, 
+			 * push our command back into the rdy list.
+			 */
+			if (aic->state == AIC_SELECTING) {
+				AIC_MISC(("backoff selector "));
+				TAILQ_INSERT_HEAD(&aic->ready_list, aic->nexus,
+				    chain);
+				aic->nexus = NULL;
+			}
+			aic->state = AIC_RESELECTED;
+			/* Clear interrupts, disable future selection stuff
+			 * including select interrupts and timeouts
+			 */
+			outb(CLRSINT0, CLRSELDI);
+			outb(SCSISEQ, 0);
+			outb(SIMODE0, 0);
+			/* Setup chip so we may detect spurious busfree
+			 * conditions later.
+			 */
+			outb(CLRSINT1, CLRBUSFREE);
+			outb(SIMODE1, ENSCSIRST|ENBUSFREE|
+			     ENSCSIPERR|ENREQINIT);
+			/* Now, we're expecting an IDENTIFY message. */
+			aic->phase = aicphase(aic);
+			if (aic->phase & PH_PSBIT) {
+				LOGLINE(aic);
+				outb(DMACNTRL0, INTEN);
+				return 1; /* Come back when REQ is set */
+			}
+			if (aic->phase == PH_MSGI)
+				aic_msgin(aic);	/* Handle identify message */
+			else {
+				/* Things are seriously fucked up.
+				 * Pull the brakes, i.e. RST
+				 */
+				printf("aic at line %d: target didn't identify\n", __LINE__);
+				Debugger();
+				aic_init(aic);
+				return 1;
+			}
+			if (aic->state != AIC_HASNEXUS) {/* IDENTIFY fail?! */
+				printf("aic at line %d: identify failed\n",
+				    __LINE__);
+				aic_init(aic);
+				return 1;
+			} else {
+				outb(SIMODE1,
+				    ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+				/* Fallthrough to HASNEXUS part of aicintr */
+			}
+		} else if (sstat0 & SELDO) {
+			LOGLINE(aic);
+			/* We have selected a target. Things to do:
+			 * a) Determine what message(s) to send.
+			 * b) Verify that we're still selecting the target.
+			 * c) Mark device as busy.
+			 */
+			acb = aic->nexus;
+			if (!acb) {
+				printf("aic at line %d: missing acb", __LINE__);
+				Debugger();
+			}
+			sc = acb->xs->sc_link;
+			ti = &aic->tinfo[sc->target];
+			if (acb->xs->flags & SCSI_RESET)
+				aic->msgpriq = SEND_DEV_RESET;
+			else if (ti->flags & DO_NEGOTIATE)
+				aic->msgpriq = SEND_IDENTIFY|SEND_SDTR;
+			else
+				aic->msgpriq = SEND_IDENTIFY;
+			/* Setup chip to enable later testing for busfree
+			 * conditions
+			 */
+			outb(CLRSINT1, CLRBUSFREE);
+			outb(SCSISEQ, 0); /* Stop selection stuff */
+			nandreg(SIMODE0, ENSELDO); /* No more selectout ints */
+			sstat0 = inb(SSTAT0);
+			if (sstat0 & SELDO) { /* Still selected!? */
+				outb(SIMODE0, 0);
+				outb(SIMODE1, ENSCSIRST|ENSCSIPERR| 
+				     ENBUSFREE|ENREQINIT);
+				aic->state = AIC_HASNEXUS;
+				aic->flags = 0;
+				aic->prevphase = PH_INVALID;
+				aic->dp = acb->daddr;
+				aic->dleft = acb->dleft;
+				ti->lubusy |= (1<<sc->lun);
+				AIC_MISC(("select ok "));
+			} else {
+				/* Has seen busfree since selection, i.e.
+				 * a "spurious" selection. Shouldn't happen.
+				 */
+				printf("aic: unexpected busfree\n");
+#ifdef __FreeBSD__
+				acb->xs->error = XS_DRIVER_STUFFUP;
+#else
+				xs->error = XS_DRIVER_STUFFUP;
+#endif
+				untimeout(aic_timeout, (caddr_t)acb);
+				aic_done(acb);
+			}
+			LOGLINE(aic);
+			outb(DMACNTRL0, INTEN);
+			return 1;
+		} else if (sstat1 & SELTO) {
+			/* Selection timed out. What to do:
+			 * Disable selections out and fail the command with 
+			 * code XS_TIMEOUT.
+			 */
+			acb = aic->nexus;
+			if (!acb) {
+				printf("aic at line %d: missing acb", __LINE__);
+				Debugger();
+			}
+			outb(SCSISEQ, ENRESELI|ENAUTOATNP);
+			outb(SXFRCTL1, 0);
+			outb(CLRSINT1, CLRSELTIMO);
+			aic->state = AIC_IDLE;
+			acb->xs->error = XS_TIMEOUT;
+			untimeout(aic_timeout, (caddr_t)acb);
+			aic_done(acb);
+			LOGLINE(aic);
+			outb(DMACNTRL0, INTEN);
+			return 1;
+		} else {
+			/* Assume a bus free interrupt.  What to do:
+			 * Start selecting.
+			 */
+			if (aic->state == AIC_IDLE)
+				aic_sched(aic);
+#if AIC_DEBUG
+			else
+				AIC_MISC(("Extra aic6360 interrupt."));
+#endif
+			LOGLINE(aic);
+			outb(DMACNTRL0, INTEN);
+			return 1;
+		}
+	}
+	/* Driver is now in state AIC_HASNEXUS, i.e. we have a current command
+	 * working the SCSI bus.  
+	 */
+	acb = aic->nexus;
+	if (aic->state != AIC_HASNEXUS || acb == NULL) {
+		printf("aic: no nexus!!\n");
+		Debugger();
+	}
+	
+	/* What sort of transfer does the bus signal? */
+	aic->phase = aicphase(aic);
+	if (!(aic->phase & PH_PSBIT)) /* not a pseudo phase */
+		outb(SCSISIGO, aic->phase);
+	outb(CLRSINT1, CLRPHASECHG);
+	/* These interrupts are enabled by default:
+	 * SCSIRSTI, SCSIPERR, BUSFREE, REQINIT
+	 */
+	switch (aic->phase) {
+	case PH_MSGO:
+		LOGLINE(aic);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("PH_MSGO ");
+		aic_msgout(aic);
+		aic->prevphase = PH_MSGO;
+		/* Setup interrupts before leaving */
+		outb(SIMODE0, 0);
+		outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+		/* Enabled ints: SCSIPERR, SCSIRSTI (unexpected)
+		 * 		 REQINIT (expected) BUSFREE (possibly expected)
+		 */
+		break;
+	case PH_CMD:		/* CMD phase & REQ asserted */
+		LOGLINE(aic);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("PH_CMD 0x%02x (%d) ",
+			       acb->cmd.opcode, acb->clen);
+		outb(SCSISIGO, PH_CMD);
+		/* Use FIFO for CMDs. Assumes that no cmd > 128 bytes. OK? */
+		/* Clear hostFIFO and enable EISA-hostFIFO transfers */
+		outb(DMACNTRL0, WRITE|RSTFIFO|INTEN);	/* 3(4) */
+		/* Clear scsiFIFO and enable SCSI-interface
+		   & hostFIFO-scsiFIFO transfers */
+		outb(SXFRCTL0, CHEN|CLRCH|CLRSTCNT); 	/* 4 */
+		outb(SXFRCTL0, SCSIEN|DMAEN|CHEN); 	/* 5 */
+		outb(DMACNTRL0, ENDMA|WRITE|INTEN); 	/* 3+6 */
+		/* What (polled) interrupts to enable */
+		outb(SIMODE1, ENPHASEMIS|ENSCSIRST|ENBUSFREE|ENSCSIPERR);
+		/* DFIFOEMP is set, FIFO (128 byte) is always big enough */
+		outsw(DMADATA, (short *)&acb->cmd, acb->clen>>1);
+
+		/* Wait for SCSI FIFO to drain */
+		LOGLINE(aic);
+		do {
+			sstat2 = inb(SSTAT2);
+		} while (!(sstat2 & SEMPTY) && !(inb(DMASTAT) & INTSTAT));
+		if (!(inb(SSTAT2) & SEMPTY)) {
+			printf("aic at line %d: SCSI-FIFO didn't drain\n",
+			    __LINE__);
+			Debugger();
+			acb->xs->error = XS_DRIVER_STUFFUP;
+			untimeout(aic_timeout, (caddr_t)acb);
+			aic_done(acb);
+			aic_init(aic);
+			return 1;
+		}
+		outb(SXFRCTL0, CHEN);	/* Clear SCSIEN & DMAEN */
+		outb(SIMODE0, 0);
+		outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR);
+		LOGLINE(aic);
+		do {
+			sxfrctl0 = inb(SXFRCTL0);
+		} while (sxfrctl0 & SCSIEN && !(inb(DMASTAT) & INTSTAT));
+		if (sxfrctl0 & SCSIEN) {
+			printf("aic at line %d: scsi xfer never finished\n",
+			    __LINE__);
+			Debugger();
+			acb->xs->error = XS_DRIVER_STUFFUP;
+			untimeout(aic_timeout, (caddr_t)acb);
+			aic_done(acb);
+			aic_init(aic);
+			return 1;
+		}
+		outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+		/* Enabled ints: BUSFREE, SCSIPERR, SCSIRSTI (unexpected)
+		 * 		 REQINIT (expected)
+		 */
+		aic->prevphase = PH_CMD;
+		break;
+	case PH_DOUT:
+		LOGLINE(aic);
+		AIC_MISC(("PH_DOUT [%d] ",aic->dleft));
+		aic_dataout(aic);
+		aic->prevphase = PH_DOUT;
+		break;
+	case PH_MSGI:
+		LOGLINE(aic);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("PH_MSGI ");
+		aic_msgin(aic);
+		outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+		aic->prevphase = PH_MSGI;
+		break;
+	case PH_DIN:
+		LOGLINE(aic);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("PH_DIN ");
+		aic_datain(aic);
+		aic->prevphase = PH_DIN;
+		break;
+	case PH_STAT:
+		LOGLINE(aic);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("PH_STAT ");
+		outb(SCSISIGO, PH_STAT);
+		outb(SXFRCTL0, CHEN|SPIOEN);
+		outb(DMACNTRL0, RSTFIFO|INTEN);
+		outb(SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE|ENSCSIPERR);
+		acb->stat = inb(SCSIDAT);
+		outb(SXFRCTL0, CHEN);
+		if (aic_debug & AIC_SHOWMISC)
+			printf("0x%02x ", acb->stat);
+		outb(SIMODE1, ENSCSIRST|ENBUSFREE|ENSCSIPERR|ENREQINIT);
+		aic->prevphase = PH_STAT;
+		break;
+	case PH_INVALID:
+		LOGLINE(aic);
+		break;
+	case PH_BUSFREE:
+		LOGLINE(aic);
+		if (aic->flags & AIC_BUSFREE_OK) { /*It's fun the 1st time.. */
+			aic->flags &= ~AIC_BUSFREE_OK;
+		} else {
+			printf("aic at line %d: unexpected busfree phase\n",
+			    __LINE__);
+			Debugger();
+		}
+		break;
+        default:
+		printf("aic at line %d: bogus bus phase\n", __LINE__);
+		Debugger();
+		break;
+	}
+	LOGLINE(aic);
+	outb(DMACNTRL0, INTEN);
+	return 1;
+}
+
+void
+aic_timeout(void *arg1) {
+	int s = splbio();
+	struct acb *acb = (struct acb *)arg1;
+#ifdef __FreeBSD__
+	int     unit;
+	struct aic_data *aic;
+#else
+	struct aic_softc *aic;
+#endif
+
+#ifdef __FreeBSD__
+	unit = acb->xs->sc_link->adapter_unit;
+	aic = aicdata[unit];
+#else
+	aic = acb->xs->sc_link->adapter_softc;
+#endif
+	sc_print_addr(acb->xs->sc_link);
+	acb->xs->error = XS_TIMEOUT;
+	printf("timed out\n");
+
+	aic_done(acb);
+	splx(s);
+}
+
+#if AIC_DEBUG
+/*
+ * The following functions are mostly used for debugging purposes, either
+ * directly called from the driver or from the kernel debugger.
+ */
+
+void
+aic_show_scsi_cmd(acb)
+	struct acb *acb;
+{
+	u_char  *b = (u_char *)&acb->cmd;
+	struct scsi_link *sc = acb->xs->sc_link;
+	int i;
+
+	sc_print_addr(sc);
+	if (!(acb->xs->flags & SCSI_RESET)) {
+		for (i = 0; i < acb->clen; i++) {
+			if (i)
+				printf(",");
+			printf("%x", b[i]);
+		}
+		printf("\n");
+	} else
+		printf("RESET\n");
+}
+
+void
+aic_print_acb(acb)
+	struct acb *acb;
+{
+
+	printf("acb@%x xs=%x flags=%x", acb, acb->xs, acb->flags);
+	printf(" daddr=%x dleft=%d stat=%x\n",
+	    (long)acb->daddr, acb->dleft, acb->stat);
+	aic_show_scsi_cmd(acb);
+}
+
+void
+aic_print_active_acb()
+{
+	struct acb *acb;
+#ifdef __FreeBSD__
+	struct aic_data *aic = aicdata[0];
+#else
+	struct aic_softc *aic = aiccd.cd_devs[0];
+#endif
+
+	printf("ready list:\n");
+	for (acb = aic->ready_list.tqh_first; acb; acb = acb->chain.tqe_next)
+		aic_print_acb(acb);
+	printf("nexus:\n");
+	if (aic->nexus)
+		aic_print_acb(aic->nexus);
+	printf("nexus list:\n");
+	for (acb = aic->nexus_list.tqh_first; acb; acb = acb->chain.tqe_next)
+		aic_print_acb(acb);
+}
+
+void
+aic_dump6360()
+{
+	u_short iobase = 0x340;
+
+	printf("aic6360: SCSISEQ=%x SXFRCTL0=%x SXFRCTL1=%x SCSISIGI=%x\n",
+	    inb(SCSISEQ), inb(SXFRCTL0), inb(SXFRCTL1), inb(SCSISIGI));
+	printf("         SSTAT0=%x SSTAT1=%x SSTAT2=%x SSTAT3=%x SSTAT4=%x\n",
+	    inb(SSTAT0), inb(SSTAT1), inb(SSTAT2), inb(SSTAT3), inb(SSTAT4));
+	printf("         SIMODE0=%x SIMODE1=%x DMACNTRL0=%x DMACNTRL1=%x DMASTAT=%x\n",
+	    inb(SIMODE0), inb(SIMODE1), inb(DMACNTRL0), inb(DMACNTRL1),
+	    inb(DMASTAT));
+	printf("         FIFOSTAT=%d SCSIBUS=0x%x\n", 
+	    inb(FIFOSTAT), inb(SCSIBUS));
+}
+
+void
+aic_dump_driver()
+{
+#ifdef __FreeBSD__
+	struct aic_data *aic = aicdata[0];
+#else
+	struct aic_softc *aic = aiccd.cd_devs[0];
+#endif
+	struct aic_tinfo *ti;
+	int i;
+	
+	printf("nexus=%x phase=%x prevphase=%x\n", aic->nexus, aic->phase,
+	    aic->prevphase);
+	printf("state=%x msgin=%x msgpriq=%x msgout=%x imlen=%d omlen=%d\n",
+	    aic->state, aic->imess[0], aic->msgpriq, aic->msgout, aic->imlen,
+	    aic->omlen);
+	printf("history:");
+	i = aic->hp;
+	do {
+		printf(" %d", aic->history[i]);
+		i = (i + 1) % AIC_HSIZE;
+	} while (i != aic->hp);
+	printf("*\n");
+	for (i = 0; i < 7; i++) {
+		ti = &aic->tinfo[i];
+		printf("tinfo%d: %d cmds %d disconnects %d timeouts",
+		    i, ti->cmds, ti->dconns, ti->touts);
+		printf(" %d senses flags=%x\n", ti->senses, ti->flags);
+	}
+}
+#endif