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NetBSD/sys/arch/x68k/dev/spc.c

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NetBSD/x68k, by Masaru Oki.
1996-05-05 16:17:03 +04:00
/* $NetBSD: spc.c,v 1.1.1.1 1996/05/05 12:17:03 oki Exp $ */
#define integrate static inline
/*
* Copyright (c) 1996 Masaru Oki. All rights reserved.
* Copyright (c) 1994, 1995, 1996 Charles M. Hannum. 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 Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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. 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.
*/
/*
* 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!
*/
/* 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:
*/
/* 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 SPC_USE_DWORDS 0
/* Synchronous data transfers? */
#define SPC_USE_SYNCHRONOUS 0
#define SPC_SYNC_REQ_ACK_OFS 8
/* Wide data transfers? */
#define SPC_USE_WIDE 0
#define SPC_MAX_WIDTH 0
/* Max attempts made to transmit a message */
#define SPC_MSG_MAX_ATTEMPT 3 /* Not used now XXX */
/* 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 SPC_MSGIN_SPIN 1 /* Will spinwait upto ?ms for a new msg byte */
#define SPC_MSGOUT_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 SPC_DEBUG to 0 they are not included (the
* kernel uses less memory) but you lose the debugging facilities.
*/
#define SPC_DEBUG 1
#define SPC_ABORT_TIMEOUT 2000 /* time to wait for abort */
/* End of customizable parameters */
/*
* MB89352 SCSI Protocol Controller (SPC) routines.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/queue.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_message.h>
#include <scsi/scsiconf.h>
#include <x68k/x68k/iodevice.h>
#include <x68k/dev/mb89352reg.h>
/*
* Definitions, most of them has turned out to be unneccesary, but here they
* are anyway.
*/
#define IOBASE sc->sc_iobase
#define BDID (IOBASE->scsi_bdid)
#define SCTL (IOBASE->scsi_sctl)
#define SCMD (IOBASE->scsi_scmd)
#define TMOD (IOBASE->scsi_tmod)
#define INTS (IOBASE->scsi_ints)
#define PSNS (IOBASE->scsi_psns)
#define SSTS (IOBASE->scsi_ssts)
#define SERR (IOBASE->scsi_serr)
#define PCTL (IOBASE->scsi_pctl)
#define MBC (IOBASE->scsi_mbc)
#define DREG (IOBASE->scsi_dreg)
#define TEMP (IOBASE->scsi_temp)
#define TCH (IOBASE->scsi_tch)
#define TCM (IOBASE->scsi_tcm)
#define TCL (IOBASE->scsi_tcl)
#define EXBF (IOBASE->scsi_exbf)
/* PSNS */
#define REQI 0x80
#define ACKI 0x40
#define ATNI 0x20
#define SELI 0x10
#define BSYI 0x08
#define MSGI 0x04
#define CDI 0x02
#define IOI 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.
*/
#if 0
#define REQO 0x80
#define ACKO 0x40
#define ATNO 0x20
#define SELO 0x10
#define BSYO 0x08
#endif
/* PCTL */
#define MSGO 0x04
#define CDO 0x02
#define IOO 0x01
/* Information transfer phases */
#define PH_DATAOUT (0)
#define PH_DATAIN (IOI)
#define PH_CMD (CDI)
#define PH_STAT (CDI | IOI)
#define PH_MSGOUT (MSGI | CDI)
#define PH_MSGIN (MSGI | CDI | IOI)
#define PH_MASK (MSGI | CDI | IOI)
#define PH_INVALID 0xff
/* 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
#ifndef DDB
#define Debugger() panic("should call debugger here (spc.c)")
#endif /* ! DDB */
/*
* 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 spc_acb {
struct scsi_generic scsi_cmd;
int scsi_cmd_length;
u_char *data_addr; /* Saved data pointer */
int data_length; /* Residue */
u_char target_stat; /* SCSI status byte */
/* struct spc_dma_seg dma[SPC_NSEG]; /* Physical addresses+len */
TAILQ_ENTRY(spc_acb) chain;
struct scsi_xfer *xs; /* SCSI xfer ctrl block from above */
int flags;
#define ACB_ALLOC 0x01
#define ACB_NEXUS 0x02
#define ACB_SENSE 0x04
#define ACB_ABORT 0x40
#define ACB_RESET 0x80
int timeout;
};
/*
* 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.
*/
struct spc_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 DO_SYNC 0x01 /* (Re)Negotiate synchronous options */
#define DO_WIDE 0x02 /* (Re)Negotiate wide options */
u_char period; /* Period suggestion */
u_char offset; /* Offset suggestion */
u_char width; /* Width suggestion */
} tinfo_t;
struct spc_softc {
struct device sc_dev;
volatile struct mb89352 *sc_iobase;
struct scsi_link sc_link; /* prototype for subdevs */
TAILQ_HEAD(, spc_acb) free_list, ready_list, nexus_list;
struct spc_acb *sc_nexus; /* current command */
struct spc_acb sc_acb[8];
struct spc_tinfo sc_tinfo[8];
/* Data about the current nexus (updated for every cmd switch) */
u_char *sc_dp; /* Current data pointer */
size_t sc_dleft; /* Data bytes left to transfer */
u_char *sc_cp; /* Current command pointer */
size_t sc_cleft; /* Command bytes left to transfer */
/* Adapter state */
u_char sc_phase; /* Current bus phase */
u_char sc_prevphase; /* Previous bus phase */
u_char sc_state; /* State applicable to the adapter */
#define SPC_INIT 0
#define SPC_IDLE 1
#define SPC_SELECTING 2 /* SCSI command is arbiting */
#define SPC_RESELECTED 3 /* Has been reselected */
#define SPC_CONNECTED 4 /* Actively using the SCSI bus */
#define SPC_DISCONNECT 5 /* MSG_DISCONNECT received */
#define SPC_CMDCOMPLETE 6 /* MSG_CMDCOMPLETE received */
#define SPC_CLEANING 7
u_char sc_flags;
#define SPC_DROP_MSGIN 0x01 /* Discard all msgs (parity err detected) */
#define SPC_ABORTING 0x02 /* Bailing out */
#define SPC_DOINGDMA 0x04 /* The FIFO data path is active! */
u_char sc_selid; /* Reselection ID */
/* Message stuff */
u_char sc_msgpriq; /* Messages we want to send */
u_char sc_msgoutq; /* Messages sent during last MESSAGE OUT */
u_char sc_lastmsg; /* Message last transmitted */
u_char sc_currmsg; /* Message currently ready to transmit */
#define SEND_DEV_RESET 0x01
#define SEND_PARITY_ERROR 0x02
#define SEND_INIT_DET_ERR 0x04
#define SEND_REJECT 0x08
#define SEND_IDENTIFY 0x10
#define SEND_ABORT 0x20
#define SEND_SDTR 0x40
#define SEND_WDTR 0x80
#define SPC_MAX_MSG_LEN 8
u_char sc_omess[SPC_MAX_MSG_LEN];
u_char *sc_omp; /* Outgoing message pointer */
u_char sc_imess[SPC_MAX_MSG_LEN];
u_char *sc_imp; /* Incoming message pointer */
/* Hardware stuff */
int sc_initiator; /* Our scsi id */
int sc_freq; /* Clock frequency in MHz */
int sc_minsync; /* Minimum sync period / 4 */
int sc_maxsync; /* Maximum sync period / 4 */
};
#if SPC_DEBUG
#define SPC_SHOWACBS 0x01
#define SPC_SHOWINTS 0x02
#define SPC_SHOWCMDS 0x04
#define SPC_SHOWMISC 0x08
#define SPC_SHOWTRACE 0x10
#define SPC_SHOWSTART 0x20
#define SPC_DOBREAK 0x40
int spc_debug = 0x00; /* SPC_SHOWSTART|SPC_SHOWMISC|SPC_SHOWTRACE; /**/
#define SPC_PRINT(b, s) do {if ((spc_debug & (b)) != 0) printf s;} while (0)
#define SPC_BREAK() do {if ((spc_debug & SPC_DOBREAK) != 0) Debugger();} while (0)
#define SPC_ASSERT(x) do {if (x) {} else {printf("%s at line %d: assertion failed\n", sc->sc_dev.dv_xname, __LINE__); Debugger();}} while (0)
#else
#define SPC_PRINT(b, s)
#define SPC_BREAK()
#define SPC_ASSERT(x)
#endif
#define SPC_ACBS(s) SPC_PRINT(SPC_SHOWACBS, s)
#define SPC_INTS(s) SPC_PRINT(SPC_SHOWINTS, s)
#define SPC_CMDS(s) SPC_PRINT(SPC_SHOWCMDS, s)
#define SPC_MISC(s) SPC_PRINT(SPC_SHOWMISC, s)
#define SPC_TRACE(s) SPC_PRINT(SPC_SHOWTRACE, s)
#define SPC_START(s) SPC_PRINT(SPC_SHOWSTART, s)
int spcmatch __P((struct device *, void *, void *));
void spcattach __P((struct device *, struct device *, void *));
int spcprint __P((void *, char *));
void spc_minphys __P((struct buf *));
int spcintr __P((int));
void spc_init __P((struct spc_softc *));
void spc_done __P((struct spc_softc *, struct spc_acb *));
void spc_dequeue __P((struct spc_softc *, struct spc_acb *));
int spc_scsi_cmd __P((struct scsi_xfer *));
int spc_poll __P((struct spc_softc *, struct scsi_xfer *, int));
integrate void spc_sched_msgout __P((struct spc_softc *, u_char));
integrate void spc_setsync __P((struct spc_softc *, struct spc_tinfo *));
void spc_select __P((struct spc_softc *, struct spc_acb *));
void spc_timeout __P((void *));
void spc_sched __P((struct spc_softc *));
void spc_scsi_reset __P((struct spc_softc *));
void spc_reset __P((struct spc_softc *));
#if SPC_DEBUG
void spc_print_active_acb();
void spc_dump_driver();
#endif
volatile void * spc_find __P((int));
struct cfattach spc_ca = {
sizeof(struct spc_softc), spcmatch, spcattach
};
struct cfdriver spc_cd = {
NULL, "spc", DV_DULL
};
struct scsi_adapter spc_switch = {
spc_scsi_cmd,
spc_minphys,
0,
0,
};
struct scsi_device spc_dev = {
NULL, /* Use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* Use default 'done' routine */
};
/*
* INITIALIZATION ROUTINES (probe, attach ++)
*/
/*
* returns non-zero value if a controller is found.
*/
int
spcmatch(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct cfdata *cf = match;
if (strcmp(aux, "spc") || spc_find(cf->cf_unit) == 0)
return 0;
return 1;
}
/*
* Find the board
*/
volatile void *
spc_find(unit)
int unit;
{
volatile void *addr;
if (unit > 1)
return 0;
switch(unit) {
case 0: /* builtin */
if (badaddr(IODEVbase->inscsirom) ||
badbaddr(&IODEVbase->io_inspc.bdid) ||
bcmp((void *)&IODEVbase->inscsirom[0x24], "SCSIIN", 6))
return 0;
addr = &IODEVbase->io_inspc;
break;
case 1: /* external */
if (badaddr(IODEVbase->exscsirom) ||
badbaddr(&IODEVbase->io_exspc.bdid) ||
bcmp((void *)&IODEVbase->exscsirom[0x24], "SCSIEX", 6))
return 0;
addr = &IODEVbase->io_exspc;
break;
}
if (badaddr(addr))
return 0;
return addr;
}
int
spcprint(aux, name)
void *aux;
char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
/*
*/
void
spcattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct spc_softc *sc = (void *)self;
SPC_TRACE(("spcattach "));
sc->sc_state = SPC_INIT;
sc->sc_iobase = spc_find(sc->sc_dev.dv_unit); /* XXX */
spc_init(sc); /* Init chip and driver */
/*
* Fill in the prototype scsi_link
*/
sc->sc_link.adapter_softc = sc;
sc->sc_link.adapter_target = sc->sc_initiator;
sc->sc_link.adapter = &spc_switch;
sc->sc_link.device = &spc_dev;
sc->sc_link.openings = 2;
printf("\n");
config_found(self, &sc->sc_link, spcprint);
}
void
spc_reset(sc)
struct spc_softc *sc;
{
sc->sc_initiator = IODEVbase->io_sram[0x70] & 0x7; /* XXX */
/*
* Disable interrupts then reset the FUJITSU chip.
*/
SCTL = SCTL_DISABLE | SCTL_CTRLRST;
SCMD = 0;
PCTL = 0;
TEMP = 0;
TCH = 0;
TCM = 0;
TCL = 0;
INTS = 0;
SCTL = SCTL_DISABLE | SCTL_ABRT_ENAB | SCTL_PARITY_ENAB | SCTL_RESEL_ENAB;
BDID = sc->sc_initiator;
delay(400);
SCTL &= ~SCTL_DISABLE;
}
/*
* Pull the SCSI RST line for 500us.
*/
void
spc_scsi_reset(sc)
struct spc_softc *sc;
{
SCMD |= SCMD_RST;
delay(500);
SCMD &= ~SCMD_RST;
delay(50);
}
/*
* Initialize spc SCSI driver.
*/
void
spc_init(sc)
struct spc_softc *sc;
{
struct spc_acb *acb;
int r;
spc_reset(sc);
spc_scsi_reset(sc);
spc_reset(sc);
if (sc->sc_state == SPC_INIT) {
/* First time through; initialize. */
TAILQ_INIT(&sc->ready_list);
TAILQ_INIT(&sc->nexus_list);
TAILQ_INIT(&sc->free_list);
sc->sc_nexus = NULL;
acb = sc->sc_acb;
bzero(acb, sizeof(sc->sc_acb));
for (r = 0; r < sizeof(sc->sc_acb) / sizeof(*acb); r++) {
TAILQ_INSERT_TAIL(&sc->free_list, acb, chain);
acb++;
}
bzero(&sc->sc_tinfo, sizeof(sc->sc_tinfo));
} else {
/* Cancel any active commands. */
sc->sc_state = SPC_CLEANING;
if ((acb = sc->sc_nexus) != NULL) {
acb->xs->error = XS_DRIVER_STUFFUP;
untimeout(spc_timeout, acb);
spc_done(sc, acb);
}
while (acb = sc->nexus_list.tqh_first) {
acb->xs->error = XS_DRIVER_STUFFUP;
untimeout(spc_timeout, acb);
spc_done(sc, acb);
}
}
sc->sc_prevphase = PH_INVALID;
for (r = 0; r < 8; r++) {
struct spc_tinfo *ti = &sc->sc_tinfo[r];
ti->flags = 0;
#if SPC_USE_SYNCHRONOUS
ti->flags |= DO_SYNC;
ti->period = sc->sc_minsync;
ti->offset = SPC_SYNC_REQ_ACK_OFS;
#else
ti->period = ti->offset = 0;
#endif
#if SPC_USE_WIDE
ti->flags |= DO_WIDE;
ti->width = SPC_MAX_WIDTH;
#else
ti->width = 0;
#endif
}
sc->sc_state = SPC_IDLE;
SCTL |= SCTL_INTR_ENAB;
}
void
spc_free_acb(sc, acb, flags)
struct spc_softc *sc;
struct spc_acb *acb;
int flags;
{
int s;
s = splbio();
acb->flags = 0;
TAILQ_INSERT_HEAD(&sc->free_list, acb, chain);
/*
* If there were none, wake anybody waiting for one to come free,
* starting with queued entries.
*/
if (acb->chain.tqe_next == 0)
wakeup(&sc->free_list);
splx(s);
}
struct spc_acb *
spc_get_acb(sc, flags)
struct spc_softc *sc;
int flags;
{
struct spc_acb *acb;
int s;
s = splbio();
while ((acb = sc->free_list.tqh_first) == NULL &&
(flags & SCSI_NOSLEEP) == 0)
tsleep(&sc->free_list, PRIBIO, "spcacb", 0);
if (acb) {
TAILQ_REMOVE(&sc->free_list, acb, chain);
acb->flags |= ACB_ALLOC;
}
splx(s);
return acb;
}
/*
* 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.
*/
int
spc_scsi_cmd(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct spc_softc *sc = sc_link->adapter_softc;
struct spc_acb *acb;
int s, flags;
SPC_TRACE(("spc_scsi_cmd "));
SPC_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen,
sc_link->target));
flags = xs->flags;
if ((acb = spc_get_acb(sc, flags)) == NULL) {
xs->error = XS_DRIVER_STUFFUP;
return TRY_AGAIN_LATER;
}
/* Initialize acb */
acb->xs = xs;
acb->timeout = xs->timeout;
if (xs->flags & SCSI_RESET) {
acb->flags |= ACB_RESET;
acb->scsi_cmd_length = 0;
acb->data_length = 0;
} else {
bcopy(xs->cmd, &acb->scsi_cmd, xs->cmdlen);
#if 1
acb->scsi_cmd.bytes[0] |= sc_link->lun << 5; /* XXX? */
#endif
acb->scsi_cmd_length = xs->cmdlen;
acb->data_addr = xs->data;
acb->data_length = xs->datalen;
}
acb->target_stat = 0;
s = splbio();
TAILQ_INSERT_TAIL(&sc->ready_list, acb, chain);
/*
* $B%-%e!<$N=hM}Cf$G$J$1$l$P!"%9%1%8%e!<%j%s%03+;O$9$k(B
*/
if (sc->sc_state == SPC_IDLE)
spc_sched(sc);
/*
* $BAw?.$K@.8y$7$?$i!"$9$0$K%j%?!<%s$9$k$+D4$Y$k(B
* $B$9$0%j%?!<%s$9$k$J$i(B SUCCESSFULLY_QUEUED $B$rJV$9(B
*/
splx(s);
if ((flags & SCSI_POLL) == 0)
return SUCCESSFULLY_QUEUED;
/* Not allowed to use interrupts, use polling instead */
if (spc_poll(sc, xs, acb->timeout)) {
spc_timeout(acb);
if (spc_poll(sc, xs, acb->timeout))
spc_timeout(acb);
}
return COMPLETE;
}
/*
* Adjust transfer size in buffer structure
*/
void
spc_minphys(bp)
struct buf *bp;
{
SPC_TRACE(("spc_minphys "));
minphys(bp);
}
/*
* Used when interrupt driven I/O isn't allowed, e.g. during boot.
*/
int
spc_poll(sc, xs, count)
struct spc_softc *sc;
struct scsi_xfer *xs;
int count;
{
SPC_TRACE(("spc_poll "));
while (count) {
/*
* If we had interrupts enabled, would we
* have got an interrupt?
*/
if (INTS != 0)
spcintr(sc->sc_dev.dv_unit);
if ((xs->flags & ITSDONE) != 0)
return 0;
delay(1000);
count--;
}
return 1;
}
/*
* LOW LEVEL SCSI UTILITIES
*/
integrate void
spc_sched_msgout(sc, m)
struct spc_softc *sc;
u_char m;
{
if (sc->sc_msgpriq == 0)
SCMD = SCMD_SET_ATN;
sc->sc_msgpriq |= m;
}
/*
* Set synchronous transfer offset and period.
*/
integrate void
spc_setsync(sc, ti)
struct spc_softc *sc;
struct spc_tinfo *ti;
{
#if SPC_USE_SYNCHRONOUS
if (ti->offset != 0)
TMOD =
((ti->period * sc->sc_freq) / 250 - 2) << 4 | ti->offset);
else
TMOD = 0;
#endif
}
/*
* Start a selection. This is used by spc_sched() to select an idle target,
* and by spc_done() to immediately reselect a target to get sense information.
*/
void
spc_select(sc, acb)
struct spc_softc *sc;
struct spc_acb *acb;
{
struct scsi_link *sc_link = acb->xs->sc_link;
int target = sc_link->target;
struct spc_tinfo *ti = &sc->sc_tinfo[target];
spc_setsync(sc, ti);
#if 0
SCMD = SCMD_SET_ATN;
#endif
PCTL = 0;
TEMP = (1 << sc->sc_initiator) | (1 << target);
/*
* BSY $B$K$h$k1~EzBT$A;~4V@_Dj(B ($B@_Dj;~4V$r2a$.$k$H(B selection timeout)
* 0 $B$K$9$k$HL58BBT$A(B (x68k $B$G$O(B Tclf == 200ns)
* T = (X * 256 + 15) * Tclf * 2 $B$J$N$G(B... 256ms $BBT$D$H$9$k$H(B
* 128000ns/200ns = X * 256 + 15
* 640 - 15 = X * 256
* X = 625 / 256
* X = 2 + 113 / 256
* $B$J$N$G(B tch $B$K(B 2, tcm $B$K(B 113 $B$rBeF~!#(B($B$$$$$N$+(B?)
*/
TCH = 2;
TCM = 113;
/* BSY $B$H(B SEL $B$,(B 0 $B$K$J$C$F$+$i%U%'!<%:3+;O$^$G$N;~4V(B */
TCL = 3;
SCMD = SCMD_SELECT;
sc->sc_state = SPC_SELECTING;
}
int
spc_reselect(sc, message)
struct spc_softc *sc;
u_char message;
{
u_char selid, target, lun;
struct spc_acb *acb;
struct scsi_link *sc_link;
struct spc_tinfo *ti;
/*
* The SCSI chip made a snapshot of the data bus while the reselection
* was being negotiated. This enables us to determine which target did
* the reselect.
*/
selid = sc->sc_selid & ~(1 << sc->sc_initiator);
if (selid & (selid - 1)) {
printf("%s: reselect with invalid selid %02x; sending DEVICE RESET\n",
sc->sc_dev.dv_xname, selid);
SPC_BREAK();
goto reset;
}
/*
* 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.
*/
target = ffs(selid) - 1;
lun = message & 0x07;
for (acb = sc->nexus_list.tqh_first; acb != NULL;
acb = acb->chain.tqe_next) {
sc_link = acb->xs->sc_link;
if (sc_link->target == target && sc_link->lun == lun)
break;
}
if (acb == NULL) {
printf("%s: reselect from target %d lun %d with no nexus; sending ABORT\n",
sc->sc_dev.dv_xname, target, lun);
SPC_BREAK();
goto abort;
}
/* Make this nexus active again. */
TAILQ_REMOVE(&sc->nexus_list, acb, chain);
sc->sc_state = SPC_CONNECTED;
sc->sc_nexus = acb;
ti = &sc->sc_tinfo[target];
ti->lubusy |= (1 << lun);
spc_setsync(sc, ti);
if (acb->flags & ACB_RESET)
spc_sched_msgout(sc, SEND_DEV_RESET);
else if (acb->flags & ACB_ABORT)
spc_sched_msgout(sc, SEND_ABORT);
/* Do an implicit RESTORE POINTERS. */
sc->sc_dp = acb->data_addr;
sc->sc_dleft = acb->data_length;
sc->sc_cp = (u_char *)&acb->scsi_cmd;
sc->sc_cleft = acb->scsi_cmd_length;
return (0);
reset:
spc_sched_msgout(sc, SEND_DEV_RESET);
return (1);
abort:
spc_sched_msgout(sc, SEND_ABORT);
return (1);
}
/*
* Schedule a SCSI operation. This has now been pulled out of the interrupt
* handler so that we may call it from spc_scsi_cmd and spc_done. This may
* save us an unecessary interrupt just to get things going. Should only be
* called when state == SPC_IDLE and at bio pl.
*/
void
spc_sched(sc)
register struct spc_softc *sc;
{
struct spc_acb *acb;
struct scsi_link *sc_link;
struct spc_tinfo *ti;
/*
* Find first acb in ready queue that is for a target/lunit pair that
* is not busy.
*/
for (acb = sc->ready_list.tqh_first; acb != NULL;
acb = acb->chain.tqe_next) {
sc_link = acb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
if ((ti->lubusy & (1 << sc_link->lun)) == 0) {
SPC_MISC(("selecting %d:%d ",
sc_link->target, sc_link->lun));
TAILQ_REMOVE(&sc->ready_list, acb, chain);
sc->sc_nexus = acb;
spc_select(sc, acb);
return;
} else
SPC_MISC(("%d:%d busy\n",
sc_link->target, sc_link->lun));
}
SPC_MISC(("idle "));
/* Nothing to start; just enable reselections and wait. */
}
void
spc_sense(sc, acb)
struct spc_softc *sc;
struct spc_acb *acb;
{
struct scsi_xfer *xs = acb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct spc_tinfo *ti = &sc->sc_tinfo[sc_link->target];
struct scsi_sense *ss = (void *)&acb->scsi_cmd;
SPC_MISC(("requesting sense "));
/* Next, setup a request sense command block */
bzero(ss, sizeof(*ss));
ss->opcode = REQUEST_SENSE;
ss->byte2 = sc_link->lun << 5;
ss->length = sizeof(struct scsi_sense_data);
acb->scsi_cmd_length = sizeof(*ss);
acb->data_addr = (char *)&xs->sense;
acb->data_length = sizeof(struct scsi_sense_data);
acb->flags |= ACB_SENSE;
ti->senses++;
if (acb->flags & ACB_NEXUS)
ti->lubusy &= ~(1 << sc_link->lun);
if (acb == sc->sc_nexus) {
spc_select(sc, acb);
} else {
spc_dequeue(sc, acb);
TAILQ_INSERT_HEAD(&sc->ready_list, acb, chain);
if (sc->sc_state == SPC_IDLE)
spc_sched(sc);
}
}
/*
* POST PROCESSING OF SCSI_CMD (usually current)
*/
void
spc_done(sc, acb)
struct spc_softc *sc;
struct spc_acb *acb;
{
struct scsi_xfer *xs = acb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct spc_tinfo *ti = &sc->sc_tinfo[sc_link->target];
SPC_TRACE(("spc_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) {
if (acb->flags & ACB_ABORT) {
xs->error = XS_DRIVER_STUFFUP;
} else if (acb->flags & ACB_SENSE) {
xs->error = XS_SENSE;
} else if (acb->target_stat == SCSI_CHECK) {
/* First, save the return values */
xs->resid = acb->data_length;
xs->status = acb->target_stat;
spc_sense(sc, acb);
return;
} else {
xs->resid = acb->data_length;
}
}
xs->flags |= ITSDONE;
#if SPC_DEBUG
if ((spc_debug & SPC_SHOWMISC) != 0) {
if (xs->resid != 0)
printf("resid=%d ", xs->resid);
if (xs->error == XS_SENSE)
printf("sense=0x%02x\n", xs->sense.error_code);
else
printf("error=%d\n", xs->error);
}
#endif
/*
* Remove the ACB from whatever queue it happens to be on.
*/
if (acb->flags & ACB_NEXUS)
ti->lubusy &= ~(1 << sc_link->lun);
if (acb == sc->sc_nexus) {
sc->sc_nexus = NULL;
sc->sc_state = SPC_IDLE;
spc_sched(sc);
} else
spc_dequeue(sc, acb);
spc_free_acb(sc, acb, xs->flags);
ti->cmds++;
scsi_done(xs);
}
void
spc_dequeue(sc, acb)
struct spc_softc *sc;
struct spc_acb *acb;
{
if (acb->flags & ACB_NEXUS) {
TAILQ_REMOVE(&sc->nexus_list, acb, chain);
} else {
TAILQ_REMOVE(&sc->ready_list, acb, chain);
}
}
/*
* INTERRUPT/PROTOCOL ENGINE
*/
#define IS1BYTEMSG(m) (((m) != 0x01 && (m) < 0x20) || (m) >= 0x80)
#define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20)
#define ISEXTMSG(m) ((m) == 0x01)
/*
* 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.
*/
void
spc_msgin(sc)
register struct spc_softc *sc;
{
int n;
SPC_TRACE(("spc_msgin "));
if (sc->sc_prevphase == PH_MSGIN) {
/* This is a continuation of the previous message. */
n = sc->sc_imp - sc->sc_imess;
goto nextbyte;
}
/* This is a new MESSAGE IN phase. Clean up our state. */
sc->sc_flags &= ~SPC_DROP_MSGIN;
nextmsg:
n = 0;
sc->sc_imp = &sc->sc_imess[n];
nextbyte:
/*
* Read a whole message, but don't ack the last byte. If we reject the
* message, we have to assert ATN during the message transfer phase
* itself.
*/
for (;;) {
#if 0
for (;;) {
if ((PSNS & PSNS_REQ) != 0)
break;
/* Wait for REQINIT. XXX Need timeout. */
}
#endif
if (INTS != 0) {
/*
* Target left MESSAGE IN, probably because it
* a) noticed our ATN signal, or
* b) ran out of messages.
*/
goto out;
}
/* If parity error, just dump everything on the floor. */
if ((SERR & (SERR_SCSI_PAR|SERR_SPC_PAR)) != 0) {
sc->sc_flags |= SPC_DROP_MSGIN;
spc_sched_msgout(sc, SEND_PARITY_ERROR);
}
/* send TRANSFER command. */
TCH = 0;
TCM = 0;
TCL = 1;
PCTL = sc->sc_phase | PCTL_BFINT_ENAB;
SCMD = SCMD_XFR; /* | SCMD_PROG_XFR */
for (;;) {
/*if ((SSTS & SSTS_BUSY) != 0 && (SSTS & SSTS_DREG_EMPTY) != 0)*/
if ((SSTS & SSTS_DREG_EMPTY) == 0)
break;
if (INTS != 0)
goto out;
}
/* Gather incoming message bytes if needed. */
if ((sc->sc_flags & SPC_DROP_MSGIN) == 0) {
if (n >= SPC_MAX_MSG_LEN) {
(void) DREG;
sc->sc_flags |= SPC_DROP_MSGIN;
spc_sched_msgout(sc, SEND_REJECT);
} else {
*sc->sc_imp++ = DREG;
n++;
/*
* This testing is suboptimal, but most
* messages will be of the one byte variety, so
* it should not affect performance
* significantly.
*/
if (n == 1 && IS1BYTEMSG(sc->sc_imess[0]))
break;
if (n == 2 && IS2BYTEMSG(sc->sc_imess[0]))
break;
if (n >= 3 && ISEXTMSG(sc->sc_imess[0]) &&
n == sc->sc_imess[1] + 2)
break;
}
} else
(void) DREG;
/*
* If we reach this spot we're either:
* a) in the middle of a multi-byte message, or
* b) dropping bytes.
*/
#if 0
/* Ack the last byte read. */
/*(void) DREG;*/
while ((PSNS & ACKI) != 0)
;
#endif
}
SPC_MISC(("n=%d imess=0x%02x ", n, sc->sc_imess[0]));
/* We now have a complete message. Parse it. */
switch (sc->sc_state) {
struct spc_acb *acb;
struct scsi_link *sc_link;
struct spc_tinfo *ti;
case SPC_CONNECTED:
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
ti = &sc->sc_tinfo[acb->xs->sc_link->target];
switch (sc->sc_imess[0]) {
case MSG_CMDCOMPLETE:
if (sc->sc_dleft < 0) {
sc_link = acb->xs->sc_link;
printf("%s: %d extra bytes from %d:%d\n",
sc->sc_dev.dv_xname, -sc->sc_dleft,
sc_link->target, sc_link->lun);
acb->data_length = 0;
}
acb->xs->resid = acb->data_length = sc->sc_dleft;
sc->sc_state = SPC_CMDCOMPLETE;
break;
case MSG_PARITY_ERROR:
/* Resend the last message. */
spc_sched_msgout(sc, sc->sc_lastmsg);
break;
case MSG_MESSAGE_REJECT:
SPC_MISC(("message rejected %02x ", sc->sc_lastmsg));
switch (sc->sc_lastmsg) {
#if SPC_USE_SYNCHRONOUS + SPC_USE_WIDE
case SEND_IDENTIFY:
ti->flags &= ~(DO_SYNC | DO_WIDE);
ti->period = ti->offset = 0;
spc_setsync(sc, ti);
ti->width = 0;
break;
#endif
#if SPC_USE_SYNCHRONOUS
case SEND_SDTR:
ti->flags &= ~DO_SYNC;
ti->period = ti->offset = 0;
spc_setsync(sc, ti);
break;
#endif
#if SPC_USE_WIDE
case SEND_WDTR:
ti->flags &= ~DO_WIDE;
ti->width = 0;
break;
#endif
case SEND_INIT_DET_ERR:
spc_sched_msgout(sc, SEND_ABORT);
break;
}
break;
case MSG_NOOP:
break;
case MSG_DISCONNECT:
ti->dconns++;
sc->sc_state = SPC_DISCONNECT;
break;
case MSG_SAVEDATAPOINTER:
acb->data_addr = sc->sc_dp;
acb->data_length = sc->sc_dleft;
break;
case MSG_RESTOREPOINTERS:
sc->sc_dp = acb->data_addr;
sc->sc_dleft = acb->data_length;
sc->sc_cp = (u_char *)&acb->scsi_cmd;
sc->sc_cleft = acb->scsi_cmd_length;
break;
case MSG_EXTENDED:
switch (sc->sc_imess[2]) {
#if SPC_USE_SYNCHRONOUS
case MSG_EXT_SDTR:
if (sc->sc_imess[1] != 3)
goto reject;
ti->period = sc->sc_imess[3];
ti->offset = sc->sc_imess[4];
ti->flags &= ~DO_SYNC;
if (ti->offset == 0) {
} else if (ti->period < sc->sc_minsync ||
ti->period > sc->sc_maxsync ||
ti->offset > 8) {
ti->period = ti->offset = 0;
spc_sched_msgout(sc, SEND_SDTR);
} else {
sc_print_addr(acb->xs->sc_link);
printf("sync, offset %d, period %dnsec\n",
ti->offset, ti->period * 4);
}
spc_setsync(sc, ti);
break;
#endif
#if SPC_USE_WIDE
case MSG_EXT_WDTR:
if (sc->sc_imess[1] != 2)
goto reject;
ti->width = sc->sc_imess[3];
ti->flags &= ~DO_WIDE;
if (ti->width == 0) {
} else if (ti->width > SPC_MAX_WIDTH) {
ti->width = 0;
spc_sched_msgout(sc, SEND_WDTR);
} else {
sc_print_addr(acb->xs->sc_link);
printf("wide, width %d\n",
1 << (3 + ti->width));
}
break;
#endif
default:
printf("%s: unrecognized MESSAGE EXTENDED; sending REJECT\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
goto reject;
}
break;
default:
printf("%s: unrecognized MESSAGE; sending REJECT\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
reject:
spc_sched_msgout(sc, SEND_REJECT);
break;
}
break;
case SPC_RESELECTED:
if (!MSG_ISIDENTIFY(sc->sc_imess[0])) {
printf("%s: reselect without IDENTIFY; sending DEVICE RESET\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
goto reset;
}
(void) spc_reselect(sc, sc->sc_imess[0]);
break;
default:
printf("%s: unexpected MESSAGE IN; sending DEVICE RESET\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
reset:
spc_sched_msgout(sc, SEND_DEV_RESET);
break;
abort:
spc_sched_msgout(sc, SEND_ABORT);
break;
}
/* Ack the last message byte. */
#if 0 /* XXX? */
(void) DREG;
while ((PSNS & ACKI) != 0)
;
#endif
/* Go get the next message, if any. */
goto nextmsg;
out:
SCMD = SCMD_RST_ACK;
SPC_MISC(("n=%d imess=0x%02x ", n, sc->sc_imess[0]));
}
/*
* Send the highest priority, scheduled message.
*/
void
spc_msgout(sc)
register struct spc_softc *sc;
{
struct spc_tinfo *ti;
int n;
SPC_TRACE(("spc_msgout "));
if (sc->sc_prevphase == PH_MSGOUT) {
if (sc->sc_omp == sc->sc_omess) {
/*
* This is a retransmission.
*
* We get here if the target stayed in MESSAGE OUT
* phase. Section 5.1.9.2 of the SCSI 2 spec indicates
* that all of the previously transmitted messages must
* be sent again, in the same order. Therefore, we
* requeue all the previously transmitted messages, and
* start again from the top. Our simple priority
* scheme keeps the messages in the right order.
*/
SPC_MISC(("retransmitting "));
sc->sc_msgpriq |= sc->sc_msgoutq;
/*
* Set ATN. If we're just sending a trivial 1-byte
* message, we'll clear ATN later on anyway.
*/
SCMD = SCMD_SET_ATN; /* XXX? */
} else {
/* This is a continuation of the previous message. */
n = sc->sc_omp - sc->sc_omess;
goto nextbyte;
}
}
/* No messages transmitted so far. */
sc->sc_msgoutq = 0;
sc->sc_lastmsg = 0;
nextmsg:
/* Pick up highest priority message. */
sc->sc_currmsg = sc->sc_msgpriq & -sc->sc_msgpriq;
sc->sc_msgpriq &= ~sc->sc_currmsg;
sc->sc_msgoutq |= sc->sc_currmsg;
/* Build the outgoing message data. */
switch (sc->sc_currmsg) {
case SEND_IDENTIFY:
SPC_ASSERT(sc->sc_nexus != NULL);
sc->sc_omess[0] =
MSG_IDENTIFY(sc->sc_nexus->xs->sc_link->lun, 1);
n = 1;
break;
#if SPC_USE_SYNCHRONOUS
case SEND_SDTR:
SPC_ASSERT(sc->sc_nexus != NULL);
ti = &sc->sc_tinfo[sc->sc_nexus->xs->sc_link->target];
sc->sc_omess[4] = MSG_EXTENDED;
sc->sc_omess[3] = 3;
sc->sc_omess[2] = MSG_EXT_SDTR;
sc->sc_omess[1] = ti->period >> 2;
sc->sc_omess[0] = ti->offset;
n = 5;
break;
#endif
#if SPC_USE_WIDE
case SEND_WDTR:
SPC_ASSERT(sc->sc_nexus != NULL);
ti = &sc->sc_tinfo[sc->sc_nexus->xs->sc_link->target];
sc->sc_omess[3] = MSG_EXTENDED;
sc->sc_omess[2] = 2;
sc->sc_omess[1] = MSG_EXT_WDTR;
sc->sc_omess[0] = ti->width;
n = 4;
break;
#endif
case SEND_DEV_RESET:
sc->sc_flags |= SPC_ABORTING;
sc->sc_omess[0] = MSG_BUS_DEV_RESET;
n = 1;
break;
case SEND_REJECT:
sc->sc_omess[0] = MSG_MESSAGE_REJECT;
n = 1;
break;
case SEND_PARITY_ERROR:
sc->sc_omess[0] = MSG_PARITY_ERROR;
n = 1;
break;
case SEND_INIT_DET_ERR:
sc->sc_omess[0] = MSG_INITIATOR_DET_ERR;
n = 1;
break;
case SEND_ABORT:
sc->sc_flags |= SPC_ABORTING;
sc->sc_omess[0] = MSG_ABORT;
n = 1;
break;
default:
printf("%s: unexpected MESSAGE OUT; sending NOOP\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
sc->sc_omess[0] = MSG_NOOP;
n = 1;
break;
}
sc->sc_omp = &sc->sc_omess[n];
nextbyte:
/* Send message bytes. */
/* send TRANSFER command. */
TCH = n >> 16;
TCM = n >> 8;
TCL = n;
PCTL = sc->sc_phase | PCTL_BFINT_ENAB;
SCMD = SCMD_XFR; /* | SCMD_PROG_XFR */
for (;;) {
if ((SSTS & SSTS_BUSY) != 0)
break;
if (INTS != 0)
goto out;
}
for (;;) {
#if 0
for (;;) {
if ((PSNS & PSNS_REQ) != 0)
break;
/* Wait for REQINIT. XXX Need timeout. */
}
#endif
if (INTS != 0) {
/*
* Target left MESSAGE OUT, possibly to reject
* our message.
*
* If this is the last message being sent, then we
* deassert ATN, since either the target is going to
* ignore this message, or it's going to ask for a
* retransmission via MESSAGE PARITY ERROR (in which
* case we reassert ATN anyway).
*/
#if 0
if (sc->sc_msgpriq == 0)
SCMD = SCMD_RST_ATN;
#endif
goto out;
}
#if 0
/* Clear ATN before last byte if this is the last message. */
if (n == 1 && sc->sc_msgpriq == 0)
SCMD = SCMD_RST_ATN;
#endif
while ((SSTS & SSTS_DREG_FULL) != 0)
;
/* Send message byte. */
DREG = *--sc->sc_omp;
--n;
/* Keep track of the last message we've sent any bytes of. */
sc->sc_lastmsg = sc->sc_currmsg;
#if 0
/* Wait for ACK to be negated. XXX Need timeout. */
while ((PSNS & ACKI) != 0)
;
#endif
if (n == 0)
break;
}
/* We get here only if the entire message has been transmitted. */
if (sc->sc_msgpriq != 0) {
/* There are more outgoing messages. */
goto nextmsg;
}
/*
* The last message has been transmitted. We need to remember the last
* message transmitted (in case the target switches to MESSAGE IN phase
* and sends a MESSAGE REJECT), and the list of messages transmitted
* this time around (in case the target stays in MESSAGE OUT phase to
* request a retransmit).
*/
out:
/* Disable REQ/ACK protocol. */
}
/*
* This new revision has been optimized (I tried) to make the common case fast,
* and the rarer cases (as a result) somewhat more comlex
*/
int
spc_dataout_pio(sc, p, n)
register struct spc_softc *sc;
u_char *p;
int n;
{
register u_char intstat = 0;
int out = 0;
#define DOUTAMOUNT 8 /* Full FIFO */
/* send TRANSFER command. */
TCH = n >> 16;
TCM = n >> 8;
TCL = n;
PCTL = sc->sc_phase | PCTL_BFINT_ENAB;
SCMD = SCMD_XFR;
for (;;) {
if ((SSTS & SSTS_BUSY) != 0)
break;
if (INTS != 0)
break;
}
/*
* 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 (n > 0) {
int xfer;
for (;;) {
intstat = INTS;
/* $B%P%C%U%!$,6u$K$J$k$^$GBT$D(B */
if ((SSTS & SSTS_DREG_EMPTY) != 0)
break;
/* $B$?$@$73d$j9~$_$,F~$C$F$-$?$iH4$1$k(B */
if (intstat != 0)
goto phasechange;
}
xfer = min(DOUTAMOUNT, n);
SPC_MISC(("%d> ", xfer));
n -= xfer;
out += xfer;
while (xfer-- > 0) {
DREG = *p++;
}
}
if (out == 0) {
for (;;) {
if (INTS != 0)
break;
}
SPC_MISC(("extra data "));
} else {
/* See the bytes off chip */
for (;;) {
/* $B%P%C%U%!$,6u$K$J$k$^$GBT$D(B */
if ((SSTS & SSTS_DREG_EMPTY) != 0)
break;
intstat = INTS;
/* $B$?$@$73d$j9~$_$,F~$C$F$-$?$iH4$1$k(B */
if (intstat != 0)
goto phasechange;
}
}
phasechange:
/* Stop the FIFO data path. */
if (intstat != 0) {
/* Some sort of phase change. */
int amount;
amount = (TCH << 16) | (TCM << 8) | TCL;
if (amount > 0) {
out -= amount;
SPC_MISC(("+%d ", amount));
}
}
/* Turn on ENREQINIT again. */
return out;
}
/*
* 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.
*/
int
spc_datain_pio(sc, p, n)
register struct spc_softc *sc;
u_char *p;
int n;
{
register u_short intstat;
int in = 0;
#define DINAMOUNT 8 /* Full FIFO */
/* send TRANSFER command. */
TCH = n >> 16;
TCM = n >> 8;
TCL = n;
PCTL = sc->sc_phase | PCTL_BFINT_ENAB;
SCMD = SCMD_XFR;
for (;;) {
if ((SSTS & SSTS_BUSY) != 0)
break;
if (INTS != 0)
goto phasechange;
}
/*
* We leave this loop if one or more of the following is true:
* a) phase != PH_DATAIN && FIFOs are empty
* b) reset has occurred or busfree is detected.
*/
while (n > 0) {
int xfer;
#define INTSMASK 0xff
/* Wait for fifo half full or phase mismatch */
for (;;) {
intstat = (SSTS << 8) | INTS;
if ((intstat & (INTSMASK | (SSTS_DREG_FULL << 8))) != 0)
break;
if ((intstat & (SSTS_DREG_EMPTY << 8)) == 0)
break;
}
#if 1
if ((intstat & INTSMASK) != 0)
goto phasechange;
#else
if ((intstat & INTSMASK) != 0 &&
(intstat & (SSTS_DREG_EMPTY << 8)))
goto phasechange;
#endif
if ((intstat & (SSTS_DREG_FULL << 8)) != 0)
xfer = min(DINAMOUNT, n);
else
xfer = min(1, n);
SPC_MISC((">%d ", xfer));
n -= xfer;
in += xfer;
while (xfer-- > 0) {
*p++ = DREG;
}
if ((intstat & INTSMASK) != 0)
goto phasechange;
}
/*
* 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 (n is probably already zero) and the
* FIFO is not empty, waste some bytes....
*/
if (in == 0) {
for (;;) {
if (INTS != 0)
break;
}
SPC_MISC(("extra data "));
}
phasechange:
/* Stop the FIFO data path. */
/* Turn on ENREQINIT again. */
return in;
}
/*
* Catch an interrupt from the adaptor
*/
/*
* This is the workhorse routine of the driver.
* Deficiencies (for now):
* 1) always uses programmed I/O
*/
int
spcintr(unit)
int unit;
{
register struct spc_softc *sc = spc_cd.cd_devs[unit]; /* XXX */
u_char ints;
register struct spc_acb *acb;
register struct scsi_link *sc_link;
struct spc_tinfo *ti;
int n;
/*
* $B3d$j9~$_6X;_$K$9$k(B
*/
SCTL &= ~SCTL_INTR_ENAB;
SPC_TRACE(("spcintr "));
loop:
/*
* $BA4E>Aw$,40A4$K=*N;$9$k$^$G%k!<%W$9$k(B
*/
/*
* First check for abnormal conditions, such as reset.
*/
#if 1 /* XXX? */
while ((ints = INTS) == 0)
delay(1);
SPC_MISC(("ints = 0x%x ", ints));
#else /* usually? */
ints = INTS;
#endif
if ((ints & INTS_RST) != 0) {
printf("%s: SCSI bus reset\n", sc->sc_dev.dv_xname);
goto reset;
}
/*
* Check for less serious errors.
*/
if ((SERR & (SERR_SCSI_PAR|SERR_SPC_PAR)) != 0) {
printf("%s: SCSI bus parity error\n", sc->sc_dev.dv_xname);
if (sc->sc_prevphase == PH_MSGIN) {
sc->sc_flags |= SPC_DROP_MSGIN;
spc_sched_msgout(sc, SEND_PARITY_ERROR);
} else
spc_sched_msgout(sc, 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?
*/
switch (sc->sc_state) {
case SPC_IDLE:
case SPC_SELECTING:
if ((ints & INTS_SEL) != 0) {
/*
* We don't currently support target mode.
*/
printf("%s: target mode selected; going to BUS FREE\n",
sc->sc_dev.dv_xname);
goto sched;
} else if ((ints & INTS_RESEL) != 0) {
SPC_MISC(("reselected "));
/*
* If we're trying to select a target ourselves,
* push our command back into the ready list.
*/
if (sc->sc_state == SPC_SELECTING) {
SPC_MISC(("backoff selector "));
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
sc->sc_nexus = NULL;
TAILQ_INSERT_HEAD(&sc->ready_list, acb, chain);
}
/* Save reselection ID. */
sc->sc_selid = TEMP;
sc->sc_state = SPC_RESELECTED;
} else if ((ints & INTS_CMD_DONE) != 0) {
SPC_MISC(("selected "));
/*
* 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.
*/
if (sc->sc_state != SPC_SELECTING) {
printf("%s: selection out while idle; resetting\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
goto reset;
}
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
sc_link = acb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
sc->sc_msgpriq = SEND_IDENTIFY;
if (acb->flags & ACB_RESET)
sc->sc_msgpriq |= SEND_DEV_RESET;
else if (acb->flags & ACB_ABORT)
sc->sc_msgpriq |= SEND_ABORT;
else {
#if SPC_USE_SYNCHRONOUS
if ((ti->flags & DO_SYNC) != 0)
sc->sc_msgpriq |= SEND_SDTR;
#endif
#if SPC_USE_WIDE
if ((ti->flags & DO_WIDE) != 0)
sc->sc_msgpriq |= SEND_WDTR;
#endif
}
acb->flags |= ACB_NEXUS;
ti->lubusy |= (1 << sc_link->lun);
/* Do an implicit RESTORE POINTERS. */
sc->sc_dp = acb->data_addr;
sc->sc_dleft = acb->data_length;
sc->sc_cp = (u_char *)&acb->scsi_cmd;
sc->sc_cleft = acb->scsi_cmd_length;
/* On our first connection, schedule a timeout. */
if ((acb->xs->flags & SCSI_POLL) == 0)
timeout(spc_timeout, acb, (acb->timeout * hz) / 1000);
sc->sc_state = SPC_CONNECTED;
} else if ((ints & INTS_TIMEOUT) != 0) {
SPC_MISC(("selection timeout "));
if (sc->sc_state != SPC_SELECTING) {
printf("%s: selection timeout while idle; resetting\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
goto reset;
}
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
delay(250);
acb->xs->error = XS_SELTIMEOUT;
goto finish;
} else {
if (sc->sc_state != SPC_IDLE) {
printf("%s: BUS FREE while not idle; state=%d\n",
sc->sc_dev.dv_xname, sc->sc_state);
SPC_BREAK();
goto out;
}
goto sched;
}
/*
* Turn off selection stuff, and prepare to catch bus free
* interrupts, parity errors, and phase changes.
*/
sc->sc_flags = 0;
sc->sc_prevphase = PH_INVALID;
goto dophase;
}
if ((ints & INTS_DISCON) != 0) {
/* We've gone to BUS FREE phase. */
PCTL &= ~PCTL_BFINT_ENAB; /* disable disconnect interrupt */
INTS = ints; /* XXX reset interrput */
switch (sc->sc_state) {
case SPC_RESELECTED:
goto sched;
case SPC_CONNECTED:
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
#if SPC_USE_SYNCHRONOUS + SPC_USE_WIDE
if (sc->sc_prevphase == PH_MSGOUT) {
/*
* If the target went to BUS FREE phase during
* or immediately after sending a SDTR or WDTR
* message, disable negotiation.
*/
sc_link = acb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
switch (sc->sc_lastmsg) {
#if SPC_USE_SYNCHRONOUS
case SEND_SDTR:
ti->flags &= ~DO_SYNC;
ti->period = ti->offset = 0;
break;
#endif
#if SPC_USE_WIDE
case SEND_WDTR:
ti->flags &= ~DO_WIDE;
ti->width = 0;
break;
#endif
}
}
#endif
if ((sc->sc_flags & SPC_ABORTING) == 0) {
/*
* Section 5.1.1 of the SCSI 2 spec suggests
* issuing a REQUEST SENSE following an
* unexpected disconnect. Some devices go into
* a contingent allegiance condition when
* disconnecting, and this is necessary to
* clean up their state.
*/
printf("%s: unexpected disconnect; sending REQUEST SENSE\n",
sc->sc_dev.dv_xname);
SPC_BREAK();
spc_sense(sc, acb);
goto out;
}
acb->xs->error = XS_DRIVER_STUFFUP;
goto finish;
case SPC_DISCONNECT:
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
TAILQ_INSERT_HEAD(&sc->nexus_list, acb, chain);
sc->sc_nexus = NULL;
goto sched;
case SPC_CMDCOMPLETE:
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
goto finish;
}
}
else if ((ints & INTS_CMD_DONE) != 0 &&
sc->sc_prevphase == PH_MSGIN && sc->sc_state != SPC_CONNECTED)
goto out;
dophase:
#if 0
if ((PSNS & PSNS_REQ) == 0) {
/* Wait for REQINIT. */
goto out;
}
#else
INTS = ints;
ints = 0;
while ((PSNS & PSNS_REQ) == 0)
delay(1); /* need timeout XXX */
#endif
/*
* $B%U%'!<%:$K$h$C$F>uBVA+0\$9$k(B
*/
sc->sc_phase = PSNS & PH_MASK;
/* PCTL = sc->sc_phase;*/
switch (sc->sc_phase) {
case PH_MSGOUT:
if (sc->sc_state != SPC_CONNECTED &&
sc->sc_state != SPC_RESELECTED)
break;
spc_msgout(sc);
sc->sc_prevphase = PH_MSGOUT;
goto loop;
case PH_MSGIN:
if (sc->sc_state != SPC_CONNECTED &&
sc->sc_state != SPC_RESELECTED)
break;
spc_msgin(sc);
sc->sc_prevphase = PH_MSGIN;
goto loop;
case PH_CMD:
if (sc->sc_state != SPC_CONNECTED)
break;
#if SPC_DEBUG
if ((spc_debug & SPC_SHOWMISC) != 0) {
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
printf("cmd=0x%02x+%d ",
acb->scsi_cmd.opcode, acb->scsi_cmd_length-1);
}
#endif
n = spc_dataout_pio(sc, sc->sc_cp, sc->sc_cleft);
sc->sc_cp += n;
sc->sc_cleft -= n;
sc->sc_prevphase = PH_CMD;
goto loop;
case PH_DATAOUT:
if (sc->sc_state != SPC_CONNECTED)
break;
SPC_MISC(("dataout dleft=%d ", sc->sc_dleft));
n = spc_dataout_pio(sc, sc->sc_dp, sc->sc_dleft);
sc->sc_dp += n;
sc->sc_dleft -= n;
sc->sc_prevphase = PH_DATAOUT;
goto loop;
case PH_DATAIN:
if (sc->sc_state != SPC_CONNECTED)
break;
SPC_MISC(("datain "));
n = spc_datain_pio(sc, sc->sc_dp, sc->sc_dleft);
sc->sc_dp += n;
sc->sc_dleft -= n;
sc->sc_prevphase = PH_DATAIN;
goto loop;
case PH_STAT:
if (sc->sc_state != SPC_CONNECTED)
break;
SPC_ASSERT(sc->sc_nexus != NULL);
acb = sc->sc_nexus;
/*acb->target_stat = DREG;*/
spc_datain_pio(sc, &acb->target_stat, 1);
SPC_MISC(("target_stat=0x%02x ", acb->target_stat));
sc->sc_prevphase = PH_STAT;
goto loop;
}
printf("%s: unexpected bus phase; resetting\n", sc->sc_dev.dv_xname);
SPC_BREAK();
reset:
spc_init(sc);
return 1;
finish:
untimeout(spc_timeout, acb);
INTS = ints;
ints = 0;
spc_done(sc, acb);
goto out;
sched:
sc->sc_state = SPC_IDLE;
spc_sched(sc);
goto out;
out:
if (ints)
INTS = ints;
SCTL |= SCTL_INTR_ENAB;
return 1;
}
void
spc_abort(sc, acb)
struct spc_softc *sc;
struct spc_acb *acb;
{
/* 2 secs for the abort */
acb->timeout = SPC_ABORT_TIMEOUT;
acb->flags |= ACB_ABORT;
if (acb == sc->sc_nexus) {
/*
* If we're still selecting, the message will be scheduled
* after selection is complete.
*/
if (sc->sc_state == SPC_CONNECTED)
spc_sched_msgout(sc, SEND_ABORT);
} else {
spc_dequeue(sc, acb);
TAILQ_INSERT_HEAD(&sc->ready_list, acb, chain);
if (sc->sc_state == SPC_IDLE)
spc_sched(sc);
}
}
void
spc_timeout(arg)
void *arg;
{
struct spc_acb *acb = arg;
struct scsi_xfer *xs = acb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct spc_softc *sc = sc_link->adapter_softc;
int s;
sc_print_addr(sc_link);
printf("timed out");
s = splbio();
if (acb->flags & ACB_ABORT) {
/* abort timed out */
printf(" AGAIN\n");
/* XXX Must reset! */
} else {
/* abort the operation that has timed out */
printf("\n");
acb->xs->error = XS_TIMEOUT;
spc_abort(sc, acb);
}
splx(s);
}
#ifdef SPC_DEBUG
/*
* The following functions are mostly used for debugging purposes, either
* directly called from the driver or from the kernel debugger.
*/
void
spc_show_scsi_cmd(acb)
struct spc_acb *acb;
{
u_char *b = (u_char *)&acb->scsi_cmd;
struct scsi_link *sc_link = acb->xs->sc_link;
int i;
sc_print_addr(sc_link);
if ((acb->xs->flags & SCSI_RESET) == 0) {
for (i = 0; i < acb->scsi_cmd_length; i++) {
if (i)
printf(",");
printf("%x", b[i]);
}
printf("\n");
} else
printf("RESET\n");
}
void
spc_print_acb(acb)
struct spc_acb *acb;
{
printf("acb@%x xs=%x flags=%x", acb, acb->xs, acb->flags);
printf(" dp=%x dleft=%d target_stat=%x\n",
(long)acb->data_addr, acb->data_length, acb->target_stat);
spc_show_scsi_cmd(acb);
}
void
spc_print_active_acb()
{
struct spc_acb *acb;
struct spc_softc *sc = spc_cd.cd_devs[0]; /* XXX */
printf("ready list:\n");
for (acb = sc->ready_list.tqh_first; acb != NULL;
acb = acb->chain.tqe_next)
spc_print_acb(acb);
printf("nexus:\n");
if (sc->sc_nexus != NULL)
spc_print_acb(sc->sc_nexus);
printf("nexus list:\n");
for (acb = sc->nexus_list.tqh_first; acb != NULL;
acb = acb->chain.tqe_next)
spc_print_acb(acb);
}
void
spc_dump_driver(sc)
struct spc_softc *sc;
{
struct spc_tinfo *ti;
int i;
printf("nexus=%x prevphase=%x\n", sc->sc_nexus, sc->sc_prevphase);
printf("state=%x msgin=%x msgpriq=%x msgoutq=%x lastmsg=%x currmsg=%x\n",
sc->sc_state, sc->sc_imess[0],
sc->sc_msgpriq, sc->sc_msgoutq, sc->sc_lastmsg, sc->sc_currmsg);
for (i = 0; i < 7; i++) {
ti = &sc->sc_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