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233c534958
NetBSD/sys/dev/ic/ncr53c9x.c
pk 233c534958 Apply patch from Michael L. Hitch (PR#4318): 
"A sequence step of 0 after a select with ATN can be a selection
 timeout, or it can also indicate the target did not respond with
 a message out phase.  The latter will occur on very old SCSI
 devices which do not respond to the ATN signal and go directly to
 the command phase".
1997-10-26 16:45:24 +00:00

2075 lines
54 KiB
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/* $NetBSD: ncr53c9x.c,v 1.21 1997/10/26 16:45:24 pk Exp $ */
/*
* Copyright (c) 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.
*
* 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.
*/
/*
* Copyright (c) 1994 Peter Galbavy
* Copyright (c) 1995 Paul Kranenburg
* 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 Peter Galbavy
* 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.
*/
/*
* Based on aic6360 by Jarle Greipsland
*
* 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!
*/
#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 <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsi_message.h>
#include <machine/cpu.h>
#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
int ncr53c9x_debug = 0; /*NCR_SHOWPHASE|NCR_SHOWMISC|NCR_SHOWTRAC|NCR_SHOWCMDS;*/
/*static*/ void ncr53c9x_readregs __P((struct ncr53c9x_softc *));
/*static*/ void ncr53c9x_select __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *));
/*static*/ int ncr53c9x_reselect __P((struct ncr53c9x_softc *, int));
/*static*/ void ncr53c9x_scsi_reset __P((struct ncr53c9x_softc *));
/*static*/ void ncr53c9x_init __P((struct ncr53c9x_softc *, int));
/*static*/ int ncr53c9x_poll __P((struct ncr53c9x_softc *,
struct scsipi_xfer *, int));
/*static*/ void ncr53c9x_sched __P((struct ncr53c9x_softc *));
/*static*/ void ncr53c9x_done __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *));
/*static*/ void ncr53c9x_msgin __P((struct ncr53c9x_softc *));
/*static*/ void ncr53c9x_msgout __P((struct ncr53c9x_softc *));
/*static*/ void ncr53c9x_timeout __P((void *arg));
/*static*/ void ncr53c9x_abort __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *));
/*static*/ void ncr53c9x_dequeue __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *));
void ncr53c9x_sense __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *));
void ncr53c9x_free_ecb __P((struct ncr53c9x_softc *,
struct ncr53c9x_ecb *, int));
struct ncr53c9x_ecb *ncr53c9x_get_ecb __P((struct ncr53c9x_softc *, int));
static inline int ncr53c9x_stp2cpb __P((struct ncr53c9x_softc *, int));
static inline void ncr53c9x_setsync __P((struct ncr53c9x_softc *,
struct ncr53c9x_tinfo *));
/*
* Names for the NCR53c9x variants, correspnding to the variant tags
* in ncr53c9xvar.h.
*/
const char *ncr53c9x_variant_names[] = {
"ESP100",
"ESP100A",
"ESP200",
"NCR53C94",
"NCR53C96",
"ESP406",
"FAS408",
"FAS216",
};
/*
* Attach this instance, and then all the sub-devices
*/
void
ncr53c9x_attach(sc, adapter, dev)
struct ncr53c9x_softc *sc;
struct scsipi_adapter *adapter;
struct scsipi_device *dev;
{
/*
* Note, the front-end has set us up to print the chip variation.
*/
if (sc->sc_rev >= NCR_VARIANT_MAX) {
printf("\n%s: unknown variant %d, devices not attached\n",
sc->sc_dev.dv_xname, sc->sc_rev);
return;
}
printf(": %s, %dMHz, SCSI ID %d\n",
ncr53c9x_variant_names[sc->sc_rev], sc->sc_freq, sc->sc_id);
sc->sc_ccf = FREQTOCCF(sc->sc_freq);
/* The value *must not* be == 1. Make it 2 */
if (sc->sc_ccf == 1)
sc->sc_ccf = 2;
/*
* The recommended timeout is 250ms. This register is loaded
* with a value calculated as follows, from the docs:
*
* (timout period) x (CLK frequency)
* reg = -------------------------------------
* 8192 x (Clock Conversion Factor)
*
* Since CCF has a linear relation to CLK, this generally computes
* to the constant of 153.
*/
sc->sc_timeout = ((250 * 1000) * sc->sc_freq) / (8192 * sc->sc_ccf);
/* CCF register only has 3 bits; 0 is actually 8 */
sc->sc_ccf &= 7;
/* Reset state & bus */
sc->sc_cfflags = sc->sc_dev.dv_cfdata->cf_flags;
sc->sc_state = 0;
ncr53c9x_init(sc, 1);
/*
* fill in the prototype scsipi_link.
*/
sc->sc_link.scsipi_scsi.channel = SCSI_CHANNEL_ONLY_ONE;
sc->sc_link.adapter_softc = sc;
sc->sc_link.scsipi_scsi.adapter_target = sc->sc_id;
sc->sc_link.adapter = adapter;
sc->sc_link.device = dev;
sc->sc_link.openings = 2;
sc->sc_link.scsipi_scsi.max_target = 7;
sc->sc_link.type = BUS_SCSI;
/*
* Now try to attach all the sub-devices
*/
config_found(&sc->sc_dev, &sc->sc_link, scsiprint);
/*
* Enable interupts from the SCSI core
*/
if ((sc->sc_rev == NCR_VARIANT_ESP406) ||
(sc->sc_rev == NCR_VARIANT_FAS408)) {
NCR_PIOREGS(sc);
NCR_WRITE_REG(sc, NCR_CFG5, NCRCFG5_SINT |
NCR_READ_REG(sc, NCR_CFG5));
NCR_SCSIREGS(sc);
}
}
/*
* This is the generic esp reset function. It does not reset the SCSI bus,
* only this controllers, but kills any on-going commands, and also stops
* and resets the DMA.
*
* After reset, registers are loaded with the defaults from the attach
* routine above.
*/
void
ncr53c9x_reset(sc)
struct ncr53c9x_softc *sc;
{
/* reset DMA first */
NCRDMA_RESET(sc);
/* reset SCSI chip */
NCRCMD(sc, NCRCMD_RSTCHIP);
NCRCMD(sc, NCRCMD_NOP);
DELAY(500);
/* do these backwards, and fall through */
switch (sc->sc_rev) {
case NCR_VARIANT_ESP406:
case NCR_VARIANT_FAS408:
NCR_SCSIREGS(sc);
case NCR_VARIANT_FAS216:
case NCR_VARIANT_NCR53C94:
case NCR_VARIANT_NCR53C96:
case NCR_VARIANT_ESP200:
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
case NCR_VARIANT_ESP100A:
NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2);
case NCR_VARIANT_ESP100:
NCR_WRITE_REG(sc, NCR_CFG1, sc->sc_cfg1);
NCR_WRITE_REG(sc, NCR_CCF, sc->sc_ccf);
NCR_WRITE_REG(sc, NCR_SYNCOFF, 0);
NCR_WRITE_REG(sc, NCR_TIMEOUT, sc->sc_timeout);
break;
default:
printf("%s: unknown revision code, assuming ESP100\n",
sc->sc_dev.dv_xname);
NCR_WRITE_REG(sc, NCR_CFG1, sc->sc_cfg1);
NCR_WRITE_REG(sc, NCR_CCF, sc->sc_ccf);
NCR_WRITE_REG(sc, NCR_SYNCOFF, 0);
NCR_WRITE_REG(sc, NCR_TIMEOUT, sc->sc_timeout);
}
}
/*
* Reset the SCSI bus, but not the chip
*/
void
ncr53c9x_scsi_reset(sc)
struct ncr53c9x_softc *sc;
{
(*sc->sc_glue->gl_dma_stop)(sc);
printf("%s: resetting SCSI bus\n", sc->sc_dev.dv_xname);
NCRCMD(sc, NCRCMD_RSTSCSI);
}
/*
* Initialize esp state machine
*/
void
ncr53c9x_init(sc, doreset)
struct ncr53c9x_softc *sc;
int doreset;
{
struct ncr53c9x_ecb *ecb;
int r;
NCR_TRACE(("[NCR_INIT(%d)] ", doreset));
if (sc->sc_state == 0) {
/* First time through; initialize. */
TAILQ_INIT(&sc->ready_list);
TAILQ_INIT(&sc->nexus_list);
TAILQ_INIT(&sc->free_list);
sc->sc_nexus = NULL;
ecb = sc->sc_ecb;
bzero(ecb, sizeof(sc->sc_ecb));
for (r = 0; r < sizeof(sc->sc_ecb) / sizeof(*ecb); r++) {
TAILQ_INSERT_TAIL(&sc->free_list, ecb, chain);
ecb++;
}
bzero(sc->sc_tinfo, sizeof(sc->sc_tinfo));
} else {
/* Cancel any active commands. */
sc->sc_state = NCR_CLEANING;
if ((ecb = sc->sc_nexus) != NULL) {
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
while ((ecb = sc->nexus_list.tqh_first) != NULL) {
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
}
/*
* reset the chip to a known state
*/
ncr53c9x_reset(sc);
sc->sc_phase = sc->sc_prevphase = INVALID_PHASE;
for (r = 0; r < 8; r++) {
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[r];
/* XXX - config flags per target: low bits: no reselect; high bits: no synch */
ti->flags = ((sc->sc_minsync && !(sc->sc_cfflags & (1<<(r+8))))
? T_NEGOTIATE : 0) |
((sc->sc_cfflags & (1<<r)) ? T_RSELECTOFF : 0) |
T_NEED_TO_RESET;
ti->period = sc->sc_minsync;
ti->offset = 0;
}
if (doreset) {
sc->sc_state = NCR_SBR;
NCRCMD(sc, NCRCMD_RSTSCSI);
} else {
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
}
}
/*
* Read the NCR registers, and save their contents for later use.
* NCR_STAT, NCR_STEP & NCR_INTR are mostly zeroed out when reading
* NCR_INTR - so make sure it is the last read.
*
* I think that (from reading the docs) most bits in these registers
* only make sense when he DMA CSR has an interrupt showing. Call only
* if an interrupt is pending.
*/
void
ncr53c9x_readregs(sc)
struct ncr53c9x_softc *sc;
{
sc->sc_espstat = NCR_READ_REG(sc, NCR_STAT);
/* Only the stepo bits are of interest */
sc->sc_espstep = NCR_READ_REG(sc, NCR_STEP) & NCRSTEP_MASK;
sc->sc_espintr = NCR_READ_REG(sc, NCR_INTR);
if (sc->sc_glue->gl_clear_latched_intr != NULL)
(*sc->sc_glue->gl_clear_latched_intr)(sc);
/*
* Determine the SCSI bus phase, return either a real SCSI bus phase
* or some pseudo phase we use to detect certain exceptions.
*/
sc->sc_phase = (sc->sc_espintr & NCRINTR_DIS)
? /* Disconnected */ BUSFREE_PHASE
: sc->sc_espstat & NCRSTAT_PHASE;
NCR_MISC(("regs[intr=%02x,stat=%02x,step=%02x] ",
sc->sc_espintr, sc->sc_espstat, sc->sc_espstep));
}
/*
* Convert Synchronous Transfer Period to chip register Clock Per Byte value.
*/
static inline int
ncr53c9x_stp2cpb(sc, period)
struct ncr53c9x_softc *sc;
int period;
{
int v;
v = (sc->sc_freq * period) / 250;
if (ncr53c9x_cpb2stp(sc, v) < period)
/* Correct round-down error */
v++;
return v;
}
static inline void
ncr53c9x_setsync(sc, ti)
struct ncr53c9x_softc *sc;
struct ncr53c9x_tinfo *ti;
{
if (ti->flags & T_SYNCMODE) {
NCR_WRITE_REG(sc, NCR_SYNCOFF, ti->offset);
NCR_WRITE_REG(sc, NCR_SYNCTP,
ncr53c9x_stp2cpb(sc, ti->period));
} else {
NCR_WRITE_REG(sc, NCR_SYNCOFF, 0);
NCR_WRITE_REG(sc, NCR_SYNCTP, 0);
}
}
int ncr53c9x_dmaselect = 0;
/*
* Send a command to a target, set the driver state to NCR_SELECTING
* and let the caller take care of the rest.
*
* Keeping this as a function allows me to say that this may be done
* by DMA instead of programmed I/O soon.
*/
void
ncr53c9x_select(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
struct scsipi_link *sc_link = ecb->xs->sc_link;
int target = sc_link->scsipi_scsi.target;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[target];
u_char *cmd;
int clen;
NCR_TRACE(("[ncr53c9x_select(t%d,l%d,cmd:%x)] ",
sc_link->scsipi_scsi.target, sc_link->scsipi_scsi.lun, ecb->cmd.cmd.opcode));
/* new state NCR_SELECTING */
sc->sc_state = NCR_SELECTING;
/*
* Schedule the timeout now, the first time we will go away
* expecting to come back due to an interrupt, because it is
* always possible that the interrupt may never happen.
*/
if ((ecb->xs->flags & SCSI_POLL) == 0)
timeout(ncr53c9x_timeout, ecb,
(ecb->timeout * hz) / 1000);
/*
* The docs say the target register is never reset, and I
* can't think of a better place to set it
*/
NCR_WRITE_REG(sc, NCR_SELID, target);
ncr53c9x_setsync(sc, ti);
if (ncr53c9x_dmaselect && (ti->flags & T_NEGOTIATE) == 0) {
size_t dmacl;
ecb->cmd.id =
MSG_IDENTIFY(sc_link->scsipi_scsi.lun,
(ti->flags & T_RSELECTOFF)?0:1);
/* setup DMA transfer for command */
clen = ecb->clen + 1;
sc->sc_cmdlen = clen;
sc->sc_cmdp = (caddr_t)&ecb->cmd;
dmacl = clen;
NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0, &dmacl);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, clen);
NCR_WRITE_REG(sc, NCR_TCM, clen >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, clen >> 16);
}
/* And get the targets attention */
NCRCMD(sc, NCRCMD_SELATN | NCRCMD_DMA);
NCRDMA_GO(sc);
return;
}
/*
* Who am I. This is where we tell the target that we are
* happy for it to disconnect etc.
*/
NCR_WRITE_REG(sc, NCR_FIFO,
MSG_IDENTIFY(sc_link->scsipi_scsi.lun, (ti->flags & T_RSELECTOFF)?0:1));
if (ti->flags & T_NEGOTIATE) {
/* Arbitrate, select and stop after IDENTIFY message */
NCRCMD(sc, NCRCMD_SELATNS);
return;
}
/* Now the command into the FIFO */
cmd = (u_char *)&ecb->cmd.cmd;
clen = ecb->clen;
while (clen--)
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
/* And get the targets attention */
NCRCMD(sc, NCRCMD_SELATN);
}
void
ncr53c9x_free_ecb(sc, ecb, flags)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
int flags;
{
int s;
s = splbio();
ecb->flags = 0;
TAILQ_INSERT_HEAD(&sc->free_list, ecb, chain);
/*
* If there were none, wake anybody waiting for one to come free,
* starting with queued entries.
*/
if (ecb->chain.tqe_next == 0)
wakeup(&sc->free_list);
splx(s);
}
struct ncr53c9x_ecb *
ncr53c9x_get_ecb(sc, flags)
struct ncr53c9x_softc *sc;
int flags;
{
struct ncr53c9x_ecb *ecb;
int s;
s = splbio();
while ((ecb = sc->free_list.tqh_first) == NULL &&
(flags & SCSI_NOSLEEP) == 0)
tsleep(&sc->free_list, PRIBIO, "especb", 0);
if (ecb) {
TAILQ_REMOVE(&sc->free_list, ecb, chain);
ecb->flags |= ECB_ALLOC;
}
splx(s);
return ecb;
}
/*
* DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS
*/
/*
* Start a SCSI-command
* This function is called by the higher level SCSI-driver to queue/run
* SCSI-commands.
*/
int
ncr53c9x_scsi_cmd(xs)
struct scsipi_xfer *xs;
{
struct scsipi_link *sc_link = xs->sc_link;
struct ncr53c9x_softc *sc = sc_link->adapter_softc;
struct ncr53c9x_ecb *ecb;
int s, flags;
NCR_TRACE(("[ncr53c9x_scsi_cmd] "));
NCR_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen,
sc_link->scsipi_scsi.target));
flags = xs->flags;
if ((ecb = ncr53c9x_get_ecb(sc, flags)) == NULL)
return TRY_AGAIN_LATER;
/* Initialize ecb */
ecb->xs = xs;
ecb->timeout = xs->timeout;
if (flags & SCSI_RESET) {
ecb->flags |= ECB_RESET;
ecb->clen = 0;
ecb->dleft = 0;
} else {
bcopy(xs->cmd, &ecb->cmd.cmd, xs->cmdlen);
ecb->clen = xs->cmdlen;
ecb->daddr = xs->data;
ecb->dleft = xs->datalen;
}
ecb->stat = 0;
s = splbio();
TAILQ_INSERT_TAIL(&sc->ready_list, ecb, chain);
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
splx(s);
if ((flags & SCSI_POLL) == 0)
return SUCCESSFULLY_QUEUED;
/* Not allowed to use interrupts, use polling instead */
if (ncr53c9x_poll(sc, xs, ecb->timeout)) {
ncr53c9x_timeout(ecb);
if (ncr53c9x_poll(sc, xs, ecb->timeout))
ncr53c9x_timeout(ecb);
}
return COMPLETE;
}
/*
* Used when interrupt driven I/O isn't allowed, e.g. during boot.
*/
int
ncr53c9x_poll(sc, xs, count)
struct ncr53c9x_softc *sc;
struct scsipi_xfer *xs;
int count;
{
NCR_TRACE(("[ncr53c9x_poll] "));
while (count) {
if (NCRDMA_ISINTR(sc)) {
ncr53c9x_intr(sc);
}
#if alternatively
if (NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT)
ncr53c9x_intr(sc);
#endif
if ((xs->flags & ITSDONE) != 0)
return 0;
if (sc->sc_state == NCR_IDLE) {
NCR_TRACE(("[ncr53c9x_poll: rescheduling] "));
ncr53c9x_sched(sc);
}
DELAY(1000);
count--;
}
return 1;
}
/*
* LOW LEVEL SCSI UTILITIES
*/
/*
* Schedule a scsi operation. This has now been pulled out of the interrupt
* handler so that we may call it from ncr53c9x_scsi_cmd and ncr53c9x_done.
* This may save us an unecessary interrupt just to get things going.
* Should only be called when state == NCR_IDLE and at bio pl.
*/
void
ncr53c9x_sched(sc)
struct ncr53c9x_softc *sc;
{
struct ncr53c9x_ecb *ecb;
struct scsipi_link *sc_link;
struct ncr53c9x_tinfo *ti;
NCR_TRACE(("[ncr53c9x_sched] "));
if (sc->sc_state != NCR_IDLE)
panic("ncr53c9x_sched: not IDLE (state=%d)", sc->sc_state);
/*
* Find first ecb in ready queue that is for a target/lunit
* combinations that is not busy.
*/
for (ecb = sc->ready_list.tqh_first; ecb; ecb = ecb->chain.tqe_next) {
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
if ((ti->lubusy & (1 << sc_link->scsipi_scsi.lun)) == 0) {
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
sc->sc_nexus = ecb;
ncr53c9x_select(sc, ecb);
break;
} else
NCR_MISC(("%d:%d busy\n",
sc_link->scsipi_scsi.target, sc_link->scsipi_scsi.lun));
}
}
void
ncr53c9x_sense(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
struct scsipi_xfer *xs = ecb->xs;
struct scsipi_link *sc_link = xs->sc_link;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
struct scsipi_sense *ss = (void *)&ecb->cmd.cmd;
NCR_MISC(("requesting sense "));
/* Next, setup a request sense command block */
bzero(ss, sizeof(*ss));
ss->opcode = REQUEST_SENSE;
ss->byte2 = sc_link->scsipi_scsi.lun << 5;
ss->length = sizeof(struct scsipi_sense_data);
ecb->clen = sizeof(*ss);
ecb->daddr = (char *)&xs->sense.scsi_sense;
ecb->dleft = sizeof(struct scsipi_sense_data);
ecb->flags |= ECB_SENSE;
ecb->timeout = NCR_SENSE_TIMEOUT;
ti->senses++;
if (ecb->flags & ECB_NEXUS)
ti->lubusy &= ~(1 << sc_link->scsipi_scsi.lun);
if (ecb == sc->sc_nexus) {
ncr53c9x_select(sc, ecb);
} else {
ncr53c9x_dequeue(sc, ecb);
TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
}
}
/*
* POST PROCESSING OF SCSI_CMD (usually current)
*/
void
ncr53c9x_done(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
struct scsipi_xfer *xs = ecb->xs;
struct scsipi_link *sc_link = xs->sc_link;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
NCR_TRACE(("[ncr53c9x_done(error:%x)] ", xs->error));
untimeout(ncr53c9x_timeout, ecb);
/*
* 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) {
xs->status = ecb->stat;
if ((ecb->flags & ECB_ABORT) != 0) {
xs->error = XS_TIMEOUT;
} else if ((ecb->flags & ECB_SENSE) != 0) {
xs->error = XS_SENSE;
} else if ((ecb->stat & ST_MASK) == SCSI_CHECK) {
/* First, save the return values */
xs->resid = ecb->dleft;
ncr53c9x_sense(sc, ecb);
return;
} else {
xs->resid = ecb->dleft;
}
}
xs->flags |= ITSDONE;
#ifdef NCR53C9X_DEBUG
if (ncr53c9x_debug & NCR_SHOWMISC) {
if (xs->resid != 0)
printf("resid=%d ", xs->resid);
if (xs->error == XS_SENSE)
printf("sense=0x%02x\n", xs->sense.scsi_sense.error_code);
else
printf("error=%d\n", xs->error);
}
#endif
/*
* Remove the ECB from whatever queue it's on.
*/
if (ecb->flags & ECB_NEXUS)
ti->lubusy &= ~(1 << sc_link->scsipi_scsi.lun);
if (ecb == sc->sc_nexus) {
sc->sc_nexus = NULL;
if (sc->sc_state != NCR_CLEANING) {
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
}
} else
ncr53c9x_dequeue(sc, ecb);
ncr53c9x_free_ecb(sc, ecb, xs->flags);
ti->cmds++;
scsipi_done(xs);
}
void
ncr53c9x_dequeue(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
if (ecb->flags & ECB_NEXUS) {
TAILQ_REMOVE(&sc->nexus_list, ecb, chain);
} else {
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
}
}
/*
* INTERRUPT/PROTOCOL ENGINE
*/
/*
* Schedule an outgoing message by prioritizing it, and asserting
* attention on the bus. We can only do this when we are the initiator
* else there will be an illegal command interrupt.
*/
#define ncr53c9x_sched_msgout(m) \
do { \
NCR_MISC(("ncr53c9x_sched_msgout %d ", m)); \
NCRCMD(sc, NCRCMD_SETATN); \
sc->sc_flags |= NCR_ATN; \
sc->sc_msgpriq |= (m); \
} while (0)
int
ncr53c9x_reselect(sc, message)
struct ncr53c9x_softc *sc;
int message;
{
u_char selid, target, lun;
struct ncr53c9x_ecb *ecb;
struct scsipi_link *sc_link;
struct ncr53c9x_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_id);
if (selid & (selid - 1)) {
printf("%s: reselect with invalid selid %02x;"
" sending DEVICE RESET\n", sc->sc_dev.dv_xname, selid);
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 (ecb = sc->nexus_list.tqh_first; ecb != NULL;
ecb = ecb->chain.tqe_next) {
sc_link = ecb->xs->sc_link;
if (sc_link->scsipi_scsi.target == target && sc_link->scsipi_scsi.lun == lun)
break;
}
if (ecb == NULL) {
printf("%s: reselect from target %d lun %d with no nexus;"
" sending ABORT\n", sc->sc_dev.dv_xname, target, lun);
goto abort;
}
/* Make this nexus active again. */
TAILQ_REMOVE(&sc->nexus_list, ecb, chain);
sc->sc_state = NCR_CONNECTED;
sc->sc_nexus = ecb;
ti = &sc->sc_tinfo[target];
ti->lubusy |= (1 << lun);
ncr53c9x_setsync(sc, ti);
if (ecb->flags & ECB_RESET)
ncr53c9x_sched_msgout(SEND_DEV_RESET);
else if (ecb->flags & ECB_ABORT)
ncr53c9x_sched_msgout(SEND_ABORT);
/* Do an implicit RESTORE POINTERS. */
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
return (0);
reset:
ncr53c9x_sched_msgout(SEND_DEV_RESET);
return (1);
abort:
ncr53c9x_sched_msgout(SEND_ABORT);
return (1);
}
#define IS1BYTEMSG(m) (((m) != 1 && (m) < 0x20) || (m) & 0x80)
#define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20)
#define ISEXTMSG(m) ((m) == 1)
/*
* Get an incoming message as initiator.
*
* The SCSI bus must already be in MESSAGE_IN_PHASE and there is a
* byte in the FIFO
*/
void
ncr53c9x_msgin(sc)
register struct ncr53c9x_softc *sc;
{
register int v;
NCR_TRACE(("[ncr53c9x_msgin(curmsglen:%ld)] ", (long)sc->sc_imlen));
if ((NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) == 0) {
printf("%s: msgin: no msg byte available\n",
sc->sc_dev.dv_xname);
return;
}
/*
* 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 (sc->sc_prevphase != MESSAGE_IN_PHASE) {
sc->sc_flags &= ~NCR_DROP_MSGI;
sc->sc_imlen = 0;
}
v = NCR_READ_REG(sc, NCR_FIFO);
NCR_MISC(("<msgbyte:0x%02x>", v));
#if 0
if (sc->sc_state == NCR_RESELECTED && sc->sc_imlen == 0) {
/*
* Which target is reselecting us? (The ID bit really)
*/
sc->sc_selid = v;
NCR_MISC(("selid=0x%2x ", sc->sc_selid));
return;
}
#endif
sc->sc_imess[sc->sc_imlen] = v;
/*
* If we're going to reject the message, don't bother storing
* the incoming bytes. But still, we need to ACK them.
*/
if ((sc->sc_flags & NCR_DROP_MSGI)) {
NCRCMD(sc, NCRCMD_MSGOK);
printf("<dropping msg byte %x>",
sc->sc_imess[sc->sc_imlen]);
return;
}
if (sc->sc_imlen >= NCR_MAX_MSG_LEN) {
ncr53c9x_sched_msgout(SEND_REJECT);
sc->sc_flags |= NCR_DROP_MSGI;
} else {
sc->sc_imlen++;
/*
* This testing is suboptimal, but most
* messages will be of the one byte variety, so
* it should not effect performance
* significantly.
*/
if (sc->sc_imlen == 1 && IS1BYTEMSG(sc->sc_imess[0]))
goto gotit;
if (sc->sc_imlen == 2 && IS2BYTEMSG(sc->sc_imess[0]))
goto gotit;
if (sc->sc_imlen >= 3 && ISEXTMSG(sc->sc_imess[0]) &&
sc->sc_imlen == sc->sc_imess[1] + 2)
goto gotit;
}
/* Ack what we have so far */
NCRCMD(sc, NCRCMD_MSGOK);
return;
gotit:
NCR_MSGS(("gotmsg(%x)", sc->sc_imess[0]));
/*
* 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
* NCR_MAX_MSG_LEN. Longer messages will be amputated.
*/
switch (sc->sc_state) {
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_tinfo *ti;
case NCR_CONNECTED:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->scsipi_scsi.target];
switch (sc->sc_imess[0]) {
case MSG_CMDCOMPLETE:
NCR_MSGS(("cmdcomplete "));
if (sc->sc_dleft < 0) {
struct scsipi_link *sc_link = ecb->xs->sc_link;
printf("%s: %ld extra bytes from %d:%d\n",
sc->sc_dev.dv_xname, -(long)sc->sc_dleft,
sc_link->scsipi_scsi.target, sc_link->scsipi_scsi.lun);
sc->sc_dleft = 0;
}
ecb->dleft = (ecb->flags & ECB_TENTATIVE_DONE)
? 0
: sc->sc_dleft;
if ((ecb->flags & ECB_SENSE) == 0)
ecb->xs->resid = ecb->dleft;
sc->sc_state = NCR_CMDCOMPLETE;
break;
case MSG_MESSAGE_REJECT:
if (ncr53c9x_debug & NCR_SHOWMSGS)
printf("%s: our msg rejected by target\n",
sc->sc_dev.dv_xname);
switch (sc->sc_msgout) {
case SEND_SDTR:
sc->sc_flags &= ~NCR_SYNCHNEGO;
ti->flags &= ~(T_NEGOTIATE | T_SYNCMODE);
ncr53c9x_setsync(sc, ti);
break;
case SEND_INIT_DET_ERR:
goto abort;
}
break;
case MSG_NOOP:
NCR_MSGS(("noop "));
break;
case MSG_DISCONNECT:
NCR_MSGS(("disconnect "));
ti->dconns++;
sc->sc_state = NCR_DISCONNECT;
/*
* Mark the fact that all bytes have moved. The
* target may not bother to do a SAVE POINTERS
* at this stage. This flag will set the residual
* count to zero on MSG COMPLETE.
*/
if (sc->sc_dleft == 0)
ecb->flags |= ECB_TENTATIVE_DONE;
break;
case MSG_SAVEDATAPOINTER:
NCR_MSGS(("save datapointer "));
ecb->daddr = sc->sc_dp;
ecb->dleft = sc->sc_dleft;
break;
case MSG_RESTOREPOINTERS:
NCR_MSGS(("restore datapointer "));
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
break;
case MSG_EXTENDED:
NCR_MSGS(("extended(%x) ", sc->sc_imess[2]));
switch (sc->sc_imess[2]) {
case MSG_EXT_SDTR:
NCR_MSGS(("SDTR period %d, offset %d ",
sc->sc_imess[3], sc->sc_imess[4]));
if (sc->sc_imess[1] != 3)
goto reject;
ti->period = sc->sc_imess[3];
ti->offset = sc->sc_imess[4];
ti->flags &= ~T_NEGOTIATE;
if (sc->sc_minsync == 0 ||
ti->offset == 0 ||
ti->period > 124) {
printf("%s:%d: async\n", "esp",
ecb->xs->sc_link->scsipi_scsi.target);
if ((sc->sc_flags&NCR_SYNCHNEGO)
== 0) {
/*
* target initiated negotiation
*/
ti->offset = 0;
ti->flags &= ~T_SYNCMODE;
ncr53c9x_sched_msgout(
SEND_SDTR);
} else {
/* we are async */
ti->flags &= ~T_SYNCMODE;
}
} else {
int r = 250/ti->period;
int s = (100*250)/ti->period - 100*r;
int p;
p = ncr53c9x_stp2cpb(sc, ti->period);
ti->period = ncr53c9x_cpb2stp(sc, p);
#ifdef NCR53C9X_DEBUG
scsi_print_addr(ecb->xs->sc_link);
printf("max sync rate %d.%02dMb/s\n",
r, s);
#endif
if ((sc->sc_flags&NCR_SYNCHNEGO)
== 0) {
/*
* target initiated negotiation
*/
if (ti->period <
sc->sc_minsync)
ti->period =
sc->sc_minsync;
if (ti->offset > 15)
ti->offset = 15;
ti->flags &= ~T_SYNCMODE;
ncr53c9x_sched_msgout(
SEND_SDTR);
} else {
/* we are sync */
ti->flags |= T_SYNCMODE;
}
}
sc->sc_flags &= ~NCR_SYNCHNEGO;
ncr53c9x_setsync(sc, ti);
break;
default:
printf("%s: unrecognized MESSAGE EXTENDED;"
" sending REJECT\n", sc->sc_dev.dv_xname);
goto reject;
}
break;
default:
NCR_MSGS(("ident "));
printf("%s: unrecognized MESSAGE; sending REJECT\n",
sc->sc_dev.dv_xname);
reject:
ncr53c9x_sched_msgout(SEND_REJECT);
break;
}
break;
case NCR_RESELECTED:
if (!MSG_ISIDENTIFY(sc->sc_imess[0])) {
printf("%s: reselect without IDENTIFY;"
" sending DEVICE RESET\n", sc->sc_dev.dv_xname);
goto reset;
}
(void) ncr53c9x_reselect(sc, sc->sc_imess[0]);
break;
default:
printf("%s: unexpected MESSAGE IN; sending DEVICE RESET\n",
sc->sc_dev.dv_xname);
reset:
ncr53c9x_sched_msgout(SEND_DEV_RESET);
break;
abort:
ncr53c9x_sched_msgout(SEND_ABORT);
break;
}
/* Ack last message byte */
NCRCMD(sc, NCRCMD_MSGOK);
/* Done, reset message pointer. */
sc->sc_flags &= ~NCR_DROP_MSGI;
sc->sc_imlen = 0;
}
/*
* Send the highest priority, scheduled message
*/
void
ncr53c9x_msgout(sc)
register struct ncr53c9x_softc *sc;
{
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_ecb *ecb;
size_t size;
NCR_TRACE(("[ncr53c9x_msgout(priq:%x, prevphase:%x)]",
sc->sc_msgpriq, sc->sc_prevphase));
if (sc->sc_flags & NCR_ATN) {
if (sc->sc_prevphase != MESSAGE_OUT_PHASE) {
new:
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
sc->sc_msgoutq = 0;
sc->sc_omlen = 0;
}
} else {
if (sc->sc_prevphase == MESSAGE_OUT_PHASE) {
ncr53c9x_sched_msgout(sc->sc_msgoutq);
goto new;
} else {
printf("%s at line %d: unexpected MESSAGE OUT phase\n",
sc->sc_dev.dv_xname, __LINE__);
}
}
if (sc->sc_omlen == 0) {
/* Pick up highest priority message */
sc->sc_msgout = sc->sc_msgpriq & -sc->sc_msgpriq;
sc->sc_msgoutq |= sc->sc_msgout;
sc->sc_msgpriq &= ~sc->sc_msgout;
sc->sc_omlen = 1; /* "Default" message len */
switch (sc->sc_msgout) {
case SEND_SDTR:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->scsipi_scsi.target];
sc->sc_omess[0] = MSG_EXTENDED;
sc->sc_omess[1] = 3;
sc->sc_omess[2] = MSG_EXT_SDTR;
sc->sc_omess[3] = ti->period;
sc->sc_omess[4] = ti->offset;
sc->sc_omlen = 5;
if ((sc->sc_flags & NCR_SYNCHNEGO) == 0) {
ti->flags |= T_SYNCMODE;
ncr53c9x_setsync(sc, ti);
}
break;
case SEND_IDENTIFY:
if (sc->sc_state != NCR_CONNECTED) {
printf("%s at line %d: no nexus\n",
sc->sc_dev.dv_xname, __LINE__);
}
ecb = sc->sc_nexus;
sc->sc_omess[0] =
MSG_IDENTIFY(ecb->xs->sc_link->scsipi_scsi.lun, 0);
break;
case SEND_DEV_RESET:
sc->sc_flags |= NCR_ABORTING;
sc->sc_omess[0] = MSG_BUS_DEV_RESET;
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->scsipi_scsi.target];
ti->flags &= ~T_SYNCMODE;
ti->flags |= T_NEGOTIATE;
break;
case SEND_PARITY_ERROR:
sc->sc_omess[0] = MSG_PARITY_ERROR;
break;
case SEND_ABORT:
sc->sc_flags |= NCR_ABORTING;
sc->sc_omess[0] = MSG_ABORT;
break;
case SEND_INIT_DET_ERR:
sc->sc_omess[0] = MSG_INITIATOR_DET_ERR;
break;
case SEND_REJECT:
sc->sc_omess[0] = MSG_MESSAGE_REJECT;
break;
default:
NCRCMD(sc, NCRCMD_RSTATN);
sc->sc_flags &= ~NCR_ATN;
sc->sc_omess[0] = MSG_NOOP;
break;
}
sc->sc_omp = sc->sc_omess;
}
#if 1
/* (re)send the message */
size = min(sc->sc_omlen, sc->sc_maxxfer);
NCRDMA_SETUP(sc, &sc->sc_omp, &sc->sc_omlen, 0, &size);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, size);
NCR_WRITE_REG(sc, NCR_TCM, size >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, size >> 16);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
NCRCMD(sc, NCRCMD_TRANS|NCRCMD_DMA);
NCRDMA_GO(sc);
#else
{ int i;
for (i = 0; i < sc->sc_omlen; i++)
NCR_WRITE_REG(sc, FIFO, sc->sc_omess[i]);
NCRCMD(sc, NCRCMD_TRANS);
sc->sc_omlen = 0;
}
#endif
}
/*
* This is the most critical part of the driver, and has to know
* how to deal with *all* error conditions and phases from the SCSI
* bus. If there are no errors and the DMA was active, then call the
* DMA pseudo-interrupt handler. If this returns 1, then that was it
* and we can return from here without further processing.
*
* Most of this needs verifying.
*/
int
ncr53c9x_intr(sc)
register struct ncr53c9x_softc *sc;
{
register struct ncr53c9x_ecb *ecb;
register struct scsipi_link *sc_link;
struct ncr53c9x_tinfo *ti;
int loop;
size_t size;
int nfifo;
NCR_TRACE(("[ncr53c9x_intr] "));
/*
* I have made some (maybe seriously flawed) assumptions here,
* but basic testing (uncomment the printf() below), show that
* certainly something happens when this loop is here.
*
* The idea is that many of the SCSI operations take very little
* time, and going away and getting interrupted is too high an
* overhead to pay. For example, selecting, sending a message
* and command and then doing some work can be done in one "pass".
*
* The DELAY is not variable because I do not understand that the
* DELAY loop should be fixed-time regardless of CPU speed, but
* I am *assuming* that the faster SCSI processors get things done
* quicker (sending a command byte etc), and so there is no
* need to be too slow.
*
* This is a heuristic. It is 2 when at 20Mhz, 2 at 25Mhz and 1
* at 40Mhz. This needs testing.
*/
for (loop = 0; 1;loop++, DELAY(50/sc->sc_freq)) {
/* a feeling of deja-vu */
if (!NCRDMA_ISINTR(sc))
return (loop != 0);
#if 0
if (loop)
printf("*");
#endif
/* and what do the registers say... */
ncr53c9x_readregs(sc);
sc->sc_intrcnt.ev_count++;
/*
* At the moment, only a SCSI Bus Reset or Illegal
* Command are classed as errors. A disconnect is a
* valid condition, and we let the code check is the
* "NCR_BUSFREE_OK" flag was set before declaring it
* and error.
*
* Also, the status register tells us about "Gross
* Errors" and "Parity errors". Only the Gross Error
* is really bad, and the parity errors are dealt
* with later
*
* TODO
* If there are too many parity error, go to slow
* cable mode ?
*/
/* SCSI Reset */
if (sc->sc_espintr & NCRINTR_SBR) {
if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) {
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
}
if (sc->sc_state != NCR_SBR) {
printf("%s: SCSI bus reset\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 0); /* Restart everything */
return 1;
}
#if 0
/*XXX*/ printf("<expected bus reset: "
"[intr %x, stat %x, step %d]>\n",
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
#endif
if (sc->sc_nexus)
panic("%s: nexus in reset state",
sc->sc_dev.dv_xname);
goto sched;
}
ecb = sc->sc_nexus;
#define NCRINTR_ERR (NCRINTR_SBR|NCRINTR_ILL)
if (sc->sc_espintr & NCRINTR_ERR ||
sc->sc_espstat & NCRSTAT_GE) {
if (sc->sc_espstat & NCRSTAT_GE) {
/* no target ? */
if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) {
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
}
if (sc->sc_state == NCR_CONNECTED ||
sc->sc_state == NCR_SELECTING) {
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
return 1;
}
if (sc->sc_espintr & NCRINTR_ILL) {
if (sc->sc_flags & NCR_EXPECT_ILLCMD) {
/*
* Eat away "Illegal command" interrupt
* on a ESP100 caused by a re-selection
* while we were trying to select
* another target.
*/
#ifdef DEBUG
printf("%s: ESP100 work-around activated\n",
sc->sc_dev.dv_xname);
#endif
sc->sc_flags &= ~NCR_EXPECT_ILLCMD;
continue;
}
/* illegal command, out of sync ? */
printf("%s: illegal command: 0x%x "
"(state %d, phase %x, prevphase %x)\n",
sc->sc_dev.dv_xname, sc->sc_lastcmd,
sc->sc_state, sc->sc_phase,
sc->sc_prevphase);
if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) {
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
}
ncr53c9x_init(sc, 1); /* Restart everything */
return 1;
}
}
sc->sc_flags &= ~NCR_EXPECT_ILLCMD;
/*
* Call if DMA is active.
*
* If DMA_INTR returns true, then maybe go 'round the loop
* again in case there is no more DMA queued, but a phase
* change is expected.
*/
if (NCRDMA_ISACTIVE(sc)) {
int r = NCRDMA_INTR(sc);
if (r == -1) {
printf("%s: DMA error; resetting\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
}
/* If DMA active here, then go back to work... */
if (NCRDMA_ISACTIVE(sc))
return 1;
/*
* Note that this can happen during normal operation
* if we are reselected while using DMA to select
* a target. If this is the case, don't issue the
* warning.
*/
if (sc->sc_dleft == 0 &&
(sc->sc_espstat & NCRSTAT_TC) == 0 &&
sc->sc_state != NCR_SELECTING)
printf("%s: !TC [intr %x, stat %x, step %d]"
" prevphase %x, resid %x\n",
sc->sc_dev.dv_xname,
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase,
ecb?ecb->dleft:-1);
}
#if 0 /* Unreliable on some NCR revisions? */
if ((sc->sc_espstat & NCRSTAT_INT) == 0) {
printf("%s: spurious interrupt\n",
sc->sc_dev.dv_xname);
return 1;
}
#endif
/*
* check for less serious errors
*/
if (sc->sc_espstat & NCRSTAT_PE) {
printf("%s: SCSI bus parity error\n",
sc->sc_dev.dv_xname);
if (sc->sc_prevphase == MESSAGE_IN_PHASE)
ncr53c9x_sched_msgout(SEND_PARITY_ERROR);
else
ncr53c9x_sched_msgout(SEND_INIT_DET_ERR);
}
if (sc->sc_espintr & NCRINTR_DIS) {
NCR_MISC(("<DISC [intr %x, stat %x, step %d]>",
sc->sc_espintr,sc->sc_espstat,sc->sc_espstep));
if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) {
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
}
/*
* This command must (apparently) be issued within
* 250mS of a disconnect. So here you are...
*/
NCRCMD(sc, NCRCMD_ENSEL);
switch (sc->sc_state) {
case NCR_RESELECTED:
goto sched;
case NCR_SELECTING:
ecb->xs->error = XS_SELTIMEOUT;
goto finish;
case NCR_CONNECTED:
if ((sc->sc_flags & NCR_SYNCHNEGO)) {
#ifdef NCR53C9X_DEBUG
if (ecb)
scsi_print_addr(ecb->xs->sc_link);
printf("sync nego not completed!\n");
#endif
ti = &sc->sc_tinfo[ecb->xs->sc_link->scsipi_scsi.target];
sc->sc_flags &= ~NCR_SYNCHNEGO;
ti->flags &=
~(T_NEGOTIATE | T_SYNCMODE);
}
/* it may be OK to disconnect */
if ((sc->sc_flags & NCR_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; ",
sc->sc_dev.dv_xname);
if (ecb->flags & ECB_SENSE) {
printf("resetting\n");
goto reset;
}
printf("sending REQUEST SENSE\n");
untimeout(ncr53c9x_timeout, ecb);
ncr53c9x_sense(sc, ecb);
goto out;
}
ecb->xs->error = XS_TIMEOUT;
goto finish;
case NCR_DISCONNECT:
TAILQ_INSERT_HEAD(&sc->nexus_list, ecb, chain);
sc->sc_nexus = NULL;
goto sched;
case NCR_CMDCOMPLETE:
goto finish;
}
}
switch (sc->sc_state) {
case NCR_SBR:
printf("%s: waiting for SCSI Bus Reset to happen\n",
sc->sc_dev.dv_xname);
return 1;
case NCR_RESELECTED:
/*
* we must be continuing a message ?
*/
if (sc->sc_phase != MESSAGE_IN_PHASE) {
printf("%s: target didn't identify\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
return 1;
}
printf("<<RESELECT CONT'd>>");
#if XXXX
ncr53c9x_msgin(sc);
if (sc->sc_state != NCR_CONNECTED) {
/* IDENTIFY fail?! */
printf("%s: identify failed\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
return 1;
}
#endif
break;
case NCR_IDLE:
if (sc->sc_flags & NCR_ICCS) printf("[[esp: BUMMER]]");
case NCR_SELECTING:
sc->sc_msgpriq = sc->sc_msgout = sc->sc_msgoutq = 0;
sc->sc_flags = 0;
ecb = sc->sc_nexus;
if (sc->sc_espintr & NCRINTR_RESEL) {
/*
* If we're trying to select a
* target ourselves, push our command
* back into the ready list.
*/
if (sc->sc_state == NCR_SELECTING) {
NCR_MISC(("backoff selector "));
untimeout(ncr53c9x_timeout, ecb);
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
TAILQ_INSERT_HEAD(&sc->ready_list,
ecb, chain);
ecb = sc->sc_nexus = NULL;
}
sc->sc_state = NCR_RESELECTED;
if (sc->sc_phase != MESSAGE_IN_PHASE) {
/*
* Things are seriously fucked up.
* Pull the brakes, i.e. reset
*/
printf("%s: target didn't identify\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
return 1;
}
/*
* The C90 only inhibits FIFO writes until
* reselection is complete, instead of
* waiting until the interrupt status register
* has been read. So, if the reselect happens
* while we were entering a command bytes (for
* another target) some of those bytes can
* appear in the FIFO here, after the
* interrupt is taken.
*/
nfifo = NCR_READ_REG(sc,NCR_FFLAG) & NCRFIFO_FF;
if (nfifo < 2 ||
(nfifo > 2 &&
sc->sc_rev != NCR_VARIANT_ESP100)) {
printf("%s: RESELECT: "
"%d bytes in FIFO! "
"[intr %x, stat %x, step %d, prevphase %x]\n",
sc->sc_dev.dv_xname,
nfifo,
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase);
ncr53c9x_init(sc, 1);
return 1;
}
sc->sc_selid = NCR_READ_REG(sc, NCR_FIFO);
NCR_MISC(("selid=0x%2x ", sc->sc_selid));
/* Handle identify message */
ncr53c9x_msgin(sc);
if (nfifo != 2) {
/*
* Note: this should not happen
* with `dmaselect' on.
*/
sc->sc_flags |= NCR_EXPECT_ILLCMD;
NCRCMD(sc, NCRCMD_FLUSH);
} else if (ncr53c9x_dmaselect &&
sc->sc_rev == NCR_VARIANT_ESP100) {
sc->sc_flags |= NCR_EXPECT_ILLCMD;
}
if (sc->sc_state != NCR_CONNECTED) {
/* IDENTIFY fail?! */
printf("%s: identify failed\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
return 1;
}
continue; /* ie. next phase expected soon */
}
#define NCRINTR_DONE (NCRINTR_FC|NCRINTR_BS)
if ((sc->sc_espintr & NCRINTR_DONE) == NCRINTR_DONE) {
ecb = sc->sc_nexus;
if (!ecb)
panic("esp: not nexus at sc->sc_nexus");
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
switch (sc->sc_espstep) {
case 0:
/*
* The target did not respond with a
* message out phase - probably an old
* device that doesn't recognize ATN.
* Clear ATN and just continue, the
* target should be in the command
* phase.
* XXXX check for command phase?
*/
NCRCMD(sc, NCRCMD_RSTATN);
break;
case 1:
if ((ti->flags & T_NEGOTIATE) == 0) {
printf("%s: step 1 & !NEG\n",
sc->sc_dev.dv_xname);
goto reset;
}
if (sc->sc_phase != MESSAGE_OUT_PHASE) {
printf("%s: !MSGOUT\n",
sc->sc_dev.dv_xname);
goto reset;
}
/* Start negotiating */
ti->period = sc->sc_minsync;
ti->offset = 15;
sc->sc_flags |= NCR_SYNCHNEGO;
ncr53c9x_sched_msgout(SEND_SDTR);
break;
case 3:
/*
* Grr, this is supposed to mean
* "target left command phase
* prematurely". It seems to happen
* regularly when sync mode is on.
* Look at FIFO to see if command
* went out.
* (Timing problems?)
*/
if (ncr53c9x_dmaselect) {
if (sc->sc_cmdlen == 0)
/* Hope for the best.. */
break;
} else if ((NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF) == 0) {
/* Hope for the best.. */
break;
}
printf("(%s:%d:%d): selection failed;"
" %d left in FIFO "
"[intr %x, stat %x, step %d]\n",
sc->sc_dev.dv_xname,
sc_link->scsipi_scsi.target,
sc_link->scsipi_scsi.lun,
NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
NCRCMD(sc, NCRCMD_FLUSH);
ncr53c9x_sched_msgout(SEND_ABORT);
return 1;
case 2:
/* Select stuck at Command Phase */
NCRCMD(sc, NCRCMD_FLUSH);
case 4:
if (ncr53c9x_dmaselect &&
sc->sc_cmdlen != 0)
printf("(%s:%d:%d): select; "
"%d left in DMA buffer\n",
sc->sc_dev.dv_xname,
sc_link->scsipi_scsi.target,
sc_link->scsipi_scsi.lun,
sc->sc_cmdlen);
/* So far, everything went fine */
break;
}
#if 0
if (ecb->xs->flags & SCSI_RESET)
ncr53c9x_sched_msgout(SEND_DEV_RESET);
else if (ti->flags & T_NEGOTIATE)
ncr53c9x_sched_msgout(
SEND_IDENTIFY | SEND_SDTR);
else
ncr53c9x_sched_msgout(SEND_IDENTIFY);
#endif
ecb->flags |= ECB_NEXUS;
ti->lubusy |= (1 << sc_link->scsipi_scsi.lun);
sc->sc_prevphase = INVALID_PHASE; /* ?? */
/* Do an implicit RESTORE POINTERS. */
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
sc->sc_state = NCR_CONNECTED;
break;
} else {
printf("%s: unexpected status after select"
": [intr %x, stat %x, step %x]\n",
sc->sc_dev.dv_xname,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
goto reset;
}
if (sc->sc_state == NCR_IDLE) {
printf("%s: stray interrupt\n",
sc->sc_dev.dv_xname);
return 0;
}
break;
case NCR_CONNECTED:
if (sc->sc_flags & NCR_ICCS) {
u_char msg;
sc->sc_flags &= ~NCR_ICCS;
if (!(sc->sc_espintr & NCRINTR_DONE)) {
printf("%s: ICCS: "
": [intr %x, stat %x, step %x]\n",
sc->sc_dev.dv_xname,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
if ((NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF) != 2) {
int i = (NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF) - 2;
while (i--)
(void) NCR_READ_REG(sc,
NCR_FIFO);
}
ecb->stat = NCR_READ_REG(sc, NCR_FIFO);
msg = NCR_READ_REG(sc, NCR_FIFO);
NCR_PHASE(("<stat:(%x,%x)>", ecb->stat, msg));
if (msg == MSG_CMDCOMPLETE) {
ecb->dleft =
(ecb->flags & ECB_TENTATIVE_DONE)
? 0
: sc->sc_dleft;
if ((ecb->flags & ECB_SENSE) == 0)
ecb->xs->resid = ecb->dleft;
sc->sc_state = NCR_CMDCOMPLETE;
} else
printf("%s: STATUS_PHASE: msg %d\n",
sc->sc_dev.dv_xname, msg);
NCRCMD(sc, NCRCMD_MSGOK);
continue; /* ie. wait for disconnect */
}
break;
default:
panic("%s: invalid state: %d",
sc->sc_dev.dv_xname,
sc->sc_state);
}
/*
* Driver is now in state NCR_CONNECTED, i.e. we
* have a current command working the SCSI bus.
*/
if (sc->sc_state != NCR_CONNECTED || ecb == NULL) {
panic("esp no nexus");
}
switch (sc->sc_phase) {
case MESSAGE_OUT_PHASE:
NCR_PHASE(("MESSAGE_OUT_PHASE "));
ncr53c9x_msgout(sc);
sc->sc_prevphase = MESSAGE_OUT_PHASE;
break;
case MESSAGE_IN_PHASE:
NCR_PHASE(("MESSAGE_IN_PHASE "));
if (sc->sc_espintr & NCRINTR_BS) {
NCRCMD(sc, NCRCMD_FLUSH);
sc->sc_flags |= NCR_WAITI;
NCRCMD(sc, NCRCMD_TRANS);
} else if (sc->sc_espintr & NCRINTR_FC) {
if ((sc->sc_flags & NCR_WAITI) == 0) {
printf("%s: MSGIN: unexpected FC bit: "
"[intr %x, stat %x, step %x]\n",
sc->sc_dev.dv_xname,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
sc->sc_flags &= ~NCR_WAITI;
ncr53c9x_msgin(sc);
} else {
printf("%s: MSGIN: weird bits: "
"[intr %x, stat %x, step %x]\n",
sc->sc_dev.dv_xname,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
sc->sc_prevphase = MESSAGE_IN_PHASE;
break;
case COMMAND_PHASE:
/*
* Send the command block. Normally we don't see this
* phase because the SEL_ATN command takes care of
* all this. However, we end up here if either the
* target or we wanted exchange some more messages
* first (e.g. to start negotiations).
*/
NCR_PHASE(("COMMAND_PHASE 0x%02x (%d) ",
ecb->cmd.cmd.opcode, ecb->clen));
if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) {
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
}
if (ncr53c9x_dmaselect) {
size_t size;
/* setup DMA transfer for command */
size = ecb->clen;
sc->sc_cmdlen = size;
sc->sc_cmdp = (caddr_t)&ecb->cmd.cmd;
NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen,
0, &size);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, size);
NCR_WRITE_REG(sc, NCR_TCM, size >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, size >> 16);
}
NCRCMD(sc, NCRCMD_TRANS | NCRCMD_DMA);
NCRDMA_GO(sc);
} else {
u_char *cmd = (u_char *)&ecb->cmd.cmd;
int i;
/* Now the command into the FIFO */
for (i = 0; i < ecb->clen; i++)
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
NCRCMD(sc, NCRCMD_TRANS);
}
sc->sc_prevphase = COMMAND_PHASE;
break;
case DATA_OUT_PHASE:
NCR_PHASE(("DATA_OUT_PHASE [%ld] ",(long)sc->sc_dleft));
NCRCMD(sc, NCRCMD_FLUSH);
size = min(sc->sc_dleft, sc->sc_maxxfer);
NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft,
0, &size);
sc->sc_prevphase = DATA_OUT_PHASE;
goto setup_xfer;
case DATA_IN_PHASE:
NCR_PHASE(("DATA_IN_PHASE "));
if (sc->sc_rev == NCR_VARIANT_ESP100)
NCRCMD(sc, NCRCMD_FLUSH);
size = min(sc->sc_dleft, sc->sc_maxxfer);
NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft,
1, &size);
sc->sc_prevphase = DATA_IN_PHASE;
setup_xfer:
/* Target returned to data phase: wipe "done" memory */
ecb->flags &= ~ECB_TENTATIVE_DONE;
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, size);
NCR_WRITE_REG(sc, NCR_TCM, size >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, size >> 16);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/*
* Note that if `size' is 0, we've already transceived
* all the bytes we want but we're still in DATA PHASE.
* Apparently, the device needs padding. Also, a
* transfer size of 0 means "maximum" to the chip
* DMA logic.
*/
NCRCMD(sc,
(size==0?NCRCMD_TRPAD:NCRCMD_TRANS)|NCRCMD_DMA);
NCRDMA_GO(sc);
return 1;
case STATUS_PHASE:
NCR_PHASE(("STATUS_PHASE "));
sc->sc_flags |= NCR_ICCS;
NCRCMD(sc, NCRCMD_ICCS);
sc->sc_prevphase = STATUS_PHASE;
break;
case INVALID_PHASE:
break;
default:
printf("%s: unexpected bus phase; resetting\n",
sc->sc_dev.dv_xname);
goto reset;
}
}
panic("esp: should not get here..");
reset:
ncr53c9x_init(sc, 1);
return 1;
finish:
ncr53c9x_done(sc, ecb);
goto out;
sched:
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
goto out;
out:
return 1;
}
void
ncr53c9x_abort(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
/* 2 secs for the abort */
ecb->timeout = NCR_ABORT_TIMEOUT;
ecb->flags |= ECB_ABORT;
if (ecb == sc->sc_nexus) {
/*
* If we're still selecting, the message will be scheduled
* after selection is complete.
*/
if (sc->sc_state == NCR_CONNECTED)
ncr53c9x_sched_msgout(SEND_ABORT);
/*
* Reschedule timeout. First, cancel a queued timeout (if any)
* in case someone decides to call ncr53c9x_abort() from
* elsewhere.
*/
untimeout(ncr53c9x_timeout, ecb);
timeout(ncr53c9x_timeout, ecb, (ecb->timeout * hz) / 1000);
} else {
ncr53c9x_dequeue(sc, ecb);
TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
}
}
void
ncr53c9x_timeout(arg)
void *arg;
{
struct ncr53c9x_ecb *ecb = arg;
struct scsipi_xfer *xs = ecb->xs;
struct scsipi_link *sc_link = xs->sc_link;
struct ncr53c9x_softc *sc = sc_link->adapter_softc;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
int s;
scsi_print_addr(sc_link);
printf("%s: timed out [ecb %p (flags 0x%x, dleft %x, stat %x)], "
"<state %d, nexus %p, phase(c %x, p %x), resid %lx, "
"msg(q %x,o %x) %s>",
sc->sc_dev.dv_xname,
ecb, ecb->flags, ecb->dleft, ecb->stat,
sc->sc_state, sc->sc_nexus, sc->sc_phase, sc->sc_prevphase,
(long)sc->sc_dleft, sc->sc_msgpriq, sc->sc_msgout,
NCRDMA_ISACTIVE(sc) ? "DMA active" : "");
#if NCR53C9X_DEBUG > 1
printf("TRACE: %s.", ecb->trace);
#endif
s = splbio();
if (ecb->flags & ECB_ABORT) {
/* abort timed out */
printf(" AGAIN\n");
ncr53c9x_init(sc, 1);
} else {
/* abort the operation that has timed out */
printf("\n");
xs->error = XS_TIMEOUT;
ncr53c9x_abort(sc, ecb);
/* Disable sync mode if stuck in a data phase */
if (ecb == sc->sc_nexus &&
(ti->flags & T_SYNCMODE) != 0 &&
(sc->sc_phase & (MSGI|CDI)) == 0) {
scsi_print_addr(sc_link);
printf("sync negotiation disabled\n");
sc->sc_cfflags |= (1<<(sc_link->scsipi_scsi.target+8));
}
}
splx(s);
}
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