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NetBSD/sys/dev/ic/ncr53c9x.c

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/* $NetBSD: ncr53c9x.c,v 1.59 2000/11/30 23:21:39 pk Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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/callout.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/pool.h>
#include <sys/scsiio.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 <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
int ncr53c9x_debug = 0; /*NCR_SHOWPHASE|NCR_SHOWMISC|NCR_SHOWTRAC|NCR_SHOWCMDS;*/
#ifdef DEBUG
int ncr53c9x_notag = 0;
#endif
/*static*/ void ncr53c9x_readregs(struct ncr53c9x_softc *);
/*static*/ void ncr53c9x_select(struct ncr53c9x_softc *, struct ncr53c9x_ecb *);
/*static*/ int ncr53c9x_reselect(struct ncr53c9x_softc *, int, int, int);
/*static*/ void ncr53c9x_scsi_reset(struct ncr53c9x_softc *);
/*static*/ int ncr53c9x_poll(struct ncr53c9x_softc *,
struct scsipi_xfer *, int);
/*static*/ void ncr53c9x_sched(struct ncr53c9x_softc *);
/*static*/ void ncr53c9x_done(struct ncr53c9x_softc *, struct ncr53c9x_ecb *);
/*static*/ void ncr53c9x_msgin(struct ncr53c9x_softc *);
/*static*/ void ncr53c9x_msgout(struct ncr53c9x_softc *);
/*static*/ void ncr53c9x_timeout(void *arg);
/*static*/ void ncr53c9x_watch(void *arg);
/*static*/ void ncr53c9x_abort(struct ncr53c9x_softc *, struct ncr53c9x_ecb *);
/*static*/ void ncr53c9x_dequeue(struct ncr53c9x_softc *, struct ncr53c9x_ecb *);
/*static*/ int ncr53c9x_ioctl(struct scsipi_link *, u_long,
caddr_t, int, struct proc *);
void ncr53c9x_sense(struct ncr53c9x_softc *, struct ncr53c9x_ecb *);
void ncr53c9x_free_ecb(struct ncr53c9x_softc *, struct ncr53c9x_ecb *, int);
struct ncr53c9x_ecb *ncr53c9x_get_ecb(struct ncr53c9x_softc *, int);
static inline int ncr53c9x_stp2cpb(struct ncr53c9x_softc *, int);
static inline void ncr53c9x_setsync(struct ncr53c9x_softc *,
struct ncr53c9x_tinfo *);
static struct ncr53c9x_linfo *ncr53c9x_lunsearch(struct ncr53c9x_tinfo *,
int64_t lun);
static int ecb_pool_initialized = 0;
static struct pool ecb_pool;
/*
* Names for the NCR53c9x variants, correspnding to the variant tags
* in ncr53c9xvar.h.
*/
static const char *ncr53c9x_variant_names[] = {
"ESP100",
"ESP100A",
"ESP200",
"NCR53C94",
"NCR53C96",
"ESP406",
"FAS408",
"FAS216",
"AM53C974",
};
static struct scsipi_adapter ncr53c9x_adapter = {
0, /* adapter refcnt */
ncr53c9x_scsi_cmd, /* cmd */
minphys, /* minphys */
ncr53c9x_ioctl, /* ioctl */
NULL, /* enable */
NULL, /* getgeom */
};
static struct scsipi_device ncr53c9x_device = {
NULL, /* use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* use default 'done' routine */
};
/*
* Search linked list for LUN info by LUN id.
*/
static struct ncr53c9x_linfo *
ncr53c9x_lunsearch(ti, lun)
struct ncr53c9x_tinfo *ti;
int64_t lun;
{
struct ncr53c9x_linfo *li;
LIST_FOREACH(li, &ti->luns, link)
if (li->lun == lun)
return (li);
return (NULL);
}
/*
* Attach this instance, and then all the sub-devices
*/
void
ncr53c9x_attach(sc, adapter, device)
struct ncr53c9x_softc *sc;
struct scsipi_adapter *adapter;
struct scsipi_device *device;
{
callout_init(&sc->sc_watchdog);
/*
* Allocate SCSI message buffers.
* Front-ends can override allocation to avoid alignment
* handling in the DMA engines. Note that that ncr53c9x_msgout()
* can request a 1 byte DMA transfer.
*/
if (sc->sc_omess == NULL)
sc->sc_omess = malloc(NCR_MAX_MSG_LEN, M_DEVBUF, M_NOWAIT);
if (sc->sc_imess == NULL)
sc->sc_imess = malloc(NCR_MAX_MSG_LEN+1, M_DEVBUF, M_NOWAIT);
if (sc->sc_omess == NULL || sc->sc_imess == NULL) {
printf("out of memory\n");
return;
}
/*
* 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;
/*
* 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) ? adapter : &ncr53c9x_adapter;
sc->sc_link.device = (device) ? device : &ncr53c9x_device;
sc->sc_link.openings = 32;
sc->sc_link.scsipi_scsi.max_target = 7;
sc->sc_link.scsipi_scsi.max_lun = 7;
sc->sc_link.type = BUS_SCSI;
/*
* Add reference to adapter so that we drop the reference after
* config_found() to make sure the adatper is disabled.
*/
if (scsipi_adapter_addref(&sc->sc_link) != 0) {
printf("%s: unable to enable controller\n",
sc->sc_dev.dv_xname);
return;
}
/* Reset state & bus */
sc->sc_cfflags = sc->sc_dev.dv_cfdata->cf_flags;
sc->sc_state = 0;
ncr53c9x_init(sc, 1);
/*
* Now try to attach all the sub-devices
*/
sc->sc_child = config_found(&sc->sc_dev, &sc->sc_link, scsiprint);
scsipi_adapter_delref(&sc->sc_link);
callout_reset(&sc->sc_watchdog, 60*hz, ncr53c9x_watch, sc);
}
int
ncr53c9x_detach(sc, flags)
struct ncr53c9x_softc *sc;
int flags;
{
int error;
if (sc->sc_child) {
error = config_detach(sc->sc_child, flags);
if (error)
return (error);
}
free(sc->sc_imess, M_DEVBUF);
free(sc->sc_omess, M_DEVBUF);
return (0);
}
/*
* This is the generic ncr53c9x reset function. It does not reset the SCSI bus,
* only this controller, 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_WRITE_REG(sc, NCR_CFG5, sc->sc_cfg5 | NCRCFG5_SINT);
NCR_WRITE_REG(sc, NCR_CFG4, sc->sc_cfg4);
case NCR_VARIANT_AM53C974:
case NCR_VARIANT_FAS216:
case NCR_VARIANT_NCR53C94:
case NCR_VARIANT_NCR53C96:
case NCR_VARIANT_ESP200:
sc->sc_features |= NCR_F_HASCFG3;
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);
}
if (sc->sc_rev == NCR_VARIANT_AM53C974)
NCR_WRITE_REG(sc, NCR_AMDCFG4, sc->sc_cfg4);
}
/*
* 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 ncr53c9x state machine
*/
void
ncr53c9x_init(sc, doreset)
struct ncr53c9x_softc *sc;
int doreset;
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
int i, r;
NCR_TRACE(("[NCR_INIT(%d)] ", doreset));
if (!ecb_pool_initialized) {
/* All instances share this pool */
pool_init(&ecb_pool, sizeof(struct ncr53c9x_ecb), 0, 0, 0,
"ncr53c9x_ecb", 0, NULL, NULL, 0);
ecb_pool_initialized = 1;
}
if (sc->sc_state == 0) {
/* First time through; initialize. */
TAILQ_INIT(&sc->ready_list);
sc->sc_nexus = NULL;
bzero(sc->sc_tinfo, sizeof(sc->sc_tinfo));
for (r = 0; r < NCR_NTARG; r++) {
LIST_INIT(&sc->sc_tinfo[r].luns);
}
} else {
/* Cancel any active commands. */
sc->sc_state = NCR_CLEANING;
sc->sc_msgify = 0;
if ((ecb = sc->sc_nexus) != NULL) {
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
/* Cancel outstanding disconnected commands on each LUN */
for (r = 0; r < 8; r++) {
LIST_FOREACH(li, &sc->sc_tinfo[r].luns, link) {
if ((ecb = li->untagged) != NULL) {
li->untagged = NULL;
/*
* XXXXXXX
*
* Should we terminate a command
* that never reached the disk?
*/
li->busy = 0;
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
for (i = 0; i < 256; i++)
if ((ecb = li->queued[i])) {
li->queued[i] = NULL;
ecb->xs->error = XS_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
li->used = 0;
}
}
}
/*
* 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_cfflags & (1<<(r+16))) ? T_TAGOFF : 0) |
((sc->sc_minsync && !(sc->sc_cfflags & (1<<(r+8))))
? T_SYNCHOFF : 0) |
((sc->sc_cfflags & (1<<r)) ? T_RSELECTOFF : 0) |
T_NEED_TO_RESET;
#ifdef DEBUG
if (ncr53c9x_notag)
ti->flags |= T_TAGOFF;
#endif
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.
*/
__inline__ 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;
{
u_char syncoff, synctp, cfg3 = sc->sc_cfg3;
if (ti->flags & T_SYNCMODE) {
syncoff = ti->offset;
synctp = ncr53c9x_stp2cpb(sc, ti->period);
if (sc->sc_features & NCR_F_FASTSCSI) {
/*
* If the period is 200ns or less (ti->period <= 50),
* put the chip in Fast SCSI mode.
*/
if (ti->period <= 50)
/*
* There are (at least) 4 variations of the
* configuration 3 register. The drive attach
* routine sets the appropriate bit to put the
* chip into Fast SCSI mode so that it doesn't
* have to be figured out here each time.
*/
cfg3 |= sc->sc_cfg3_fscsi;
}
/*
* Am53c974 requires different SYNCTP values when the
* FSCSI bit is off.
*/
if (sc->sc_rev == NCR_VARIANT_AM53C974 &&
(cfg3 & NCRAMDCFG3_FSCSI) == 0)
synctp--;
} else {
syncoff = 0;
synctp = 0;
}
if (sc->sc_features & NCR_F_HASCFG3)
NCR_WRITE_REG(sc, NCR_CFG3, cfg3);
NCR_WRITE_REG(sc, NCR_SYNCOFF, syncoff);
NCR_WRITE_REG(sc, NCR_SYNCTP, synctp);
}
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;
int lun = sc_link->scsipi_scsi.lun;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[target];
int tiflags = ti->flags;
u_char *cmd;
int clen;
size_t dmasize;
NCR_TRACE(("[ncr53c9x_select(t%d,l%d,cmd:%x,tag:%x,%x)] ",
target, lun, ecb->cmd.cmd.opcode, ecb->tag[0], ecb->tag[1]));
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->xs_control & XS_CTL_POLL) == 0) {
int timeout = ecb->timeout;
if (hz > 100 && timeout > 1000)
timeout = (timeout / 1000) * hz;
else
timeout = (timeout * hz) / 1000;
callout_reset(&ecb->xs->xs_callout, timeout,
ncr53c9x_timeout, ecb);
}
/*
* 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 ((ecb->flags & ECB_SENSE) != 0) {
/*
* For REQUEST SENSE, we should not send an IDENTIFY or
* otherwise mangle the target. There should be no MESSAGE IN
* phase.
*/
if (ncr53c9x_dmaselect) {
/* setup DMA transfer for command */
dmasize = clen = ecb->clen;
sc->sc_cmdlen = clen;
sc->sc_cmdp = (caddr_t)&ecb->cmd.cmd;
NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0,
&dmasize);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, dmasize);
NCR_WRITE_REG(sc, NCR_TCM, dmasize >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, dmasize >> 16);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* And get the targets attention */
NCRCMD(sc, NCRCMD_SELNATN | NCRCMD_DMA);
NCRDMA_GO(sc);
} else {
/* Now get the command into the FIFO */
cmd = (u_char *)&ecb->cmd.cmd;
clen = ecb->clen;
while (clen--)
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
NCRCMD(sc, NCRCMD_SELNATN);
}
return;
}
if (ecb->tag[0]) {
/* We'll use tags */
ecb->cmd.msg[0] = MSG_IDENTIFY(lun, 1);
ecb->cmd.msg[1] = ecb->tag[0];
ecb->cmd.msg[2] = ecb->tag[1];
cmd = (u_char *)&ecb->cmd.msg[0];
clen = ecb->clen + 3;
} else {
ecb->cmd.msg[2] =
MSG_IDENTIFY(lun, (tiflags & T_RSELECTOFF)?0:1);
cmd = (u_char *)&ecb->cmd.msg[2];
clen = ecb->clen + 1;
}
if (ncr53c9x_dmaselect && (tiflags & T_NEGOTIATE) == 0) {
/* setup DMA transfer for command */
dmasize = clen;
sc->sc_cmdlen = clen;
sc->sc_cmdp = cmd;
NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0, &dmasize);
/* Program the SCSI counter */
NCR_WRITE_REG(sc, NCR_TCL, dmasize);
NCR_WRITE_REG(sc, NCR_TCM, dmasize >> 8);
if (sc->sc_cfg2 & NCRCFG2_FE) {
NCR_WRITE_REG(sc, NCR_TCH, dmasize >> 16);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* And get the targets attention */
if (ecb->tag[0])
NCRCMD(sc, NCRCMD_SELATN3 | NCRCMD_DMA);
else
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, *cmd++);
clen --;
if (ti->flags & T_NEGOTIATE) {
/* Arbitrate, select and stop after IDENTIFY message */
NCRCMD(sc, NCRCMD_SELATNS);
return;
}
/* If we want to send a tag, get it into the fifo */
if (ecb->tag[0]) {
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
clen --;
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
clen --;
}
/* Now get the command into the FIFO */
while (clen--)
NCR_WRITE_REG(sc, NCR_FIFO, *cmd++);
/* And get the targets attention */
if (ecb->tag[0])
NCRCMD(sc, NCRCMD_SELATN3 | NCRCMD_DMA);
else
NCRCMD(sc, NCRCMD_SELATN | NCRCMD_DMA);
}
void
ncr53c9x_free_ecb(sc, ecb, flags)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
int flags;
{
int s;
s = splbio();
ecb->flags = 0;
pool_put(&ecb_pool, (void *)ecb);
splx(s);
return;
}
struct ncr53c9x_ecb *
ncr53c9x_get_ecb(sc, flags)
struct ncr53c9x_softc *sc;
int flags;
{
struct ncr53c9x_ecb *ecb;
int s, wait = 0;
if ((curproc != NULL) && ((flags & XS_CTL_NOSLEEP) == 0))
wait = PR_WAITOK;
s = splbio();
ecb = (struct ncr53c9x_ecb *)pool_get(&ecb_pool, wait);
splx(s);
bzero(ecb, sizeof(*ecb));
if (ecb)
ecb->flags |= ECB_ALLOC;
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;
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_linfo *li;
int64_t lun = sc_link->scsipi_scsi.lun;
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));
/*
* Find the LUN info structure and allocate one if it does
* not exist.
*/
flags = xs->xs_control;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
li = TINFO_LUN(ti, lun);
if (li == NULL) {
int wait = M_NOWAIT;
/* Initialize LUN info and add to list. */
if ((curproc != NULL) && ((flags & XS_CTL_NOSLEEP) == 0))
wait = M_WAITOK;
if ((li = malloc(sizeof(*li), M_DEVBUF, M_NOWAIT)) == NULL) {
return (TRY_AGAIN_LATER);
}
bzero(li, sizeof(*li));
li->last_used = time.tv_sec;
li->lun = lun;
s = splbio();
LIST_INSERT_HEAD(&ti->luns, li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = li;
splx(s);
}
if ((ecb = ncr53c9x_get_ecb(sc, flags)) == NULL)
return (TRY_AGAIN_LATER);
/* Initialize ecb */
ecb->xs = xs;
ecb->timeout = xs->timeout;
if (flags & XS_CTL_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);
ecb->flags |= ECB_READY;
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
splx(s);
if ((flags & XS_CTL_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->xs_status & XS_STS_DONE) != 0)
return (0);
if (sc->sc_state == NCR_IDLE) {
NCR_TRACE(("[ncr53c9x_poll: rescheduling] "));
ncr53c9x_sched(sc);
}
DELAY(1000);
count--;
}
return (1);
}
int
ncr53c9x_ioctl(link, cmd, arg, flag, p)
struct scsipi_link *link;
u_long cmd;
caddr_t arg;
int flag;
struct proc *p;
{
struct ncr53c9x_softc *sc = link->adapter_softc;
int s, error;
s = splbio();
switch (cmd) {
case SCBUSACCEL: {
struct scbusaccel_args *sp = (struct scbusaccel_args *)arg;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sp->sa_target];
if (sp->sa_lun != 0)
break;
if ((sp->sa_flags & SC_ACCEL_SYNC) != 0) {
/* If this adapter can't do sync; drop it */
if (sc->sc_minsync == 0)
break;
/*
* Check whether target is already clamped at
* non-sync operation on user request.
*/
if ((ti->flags & T_SYNCHOFF) != 0)
break;
printf("%s: target %d: sync negotiation\n",
sc->sc_dev.dv_xname, sp->sa_target);
ti->flags |= T_NEGOTIATE;
}
break;
}
default:
error = ENOTTY;
break;
}
splx(s);
return (error);
}
/*
* 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;
int lun;
struct ncr53c9x_linfo *li;
int s, tag;
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 = TAILQ_FIRST(&sc->ready_list); ecb != NULL;
ecb = TAILQ_NEXT(ecb, chain)) {
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
lun = sc_link->scsipi_scsi.lun;
/* Select type of tag for this command */
if ((ti->flags & (T_RSELECTOFF|T_TAGOFF)) != 0)
tag = 0;
else if ((ecb->flags & ECB_SENSE) != 0)
tag = 0;
else if (ecb->xs->xs_control & XS_CTL_URGENT)
tag = MSG_HEAD_OF_Q_TAG;
else
tag = MSG_SIMPLE_Q_TAG;
#if 0
/* XXXX Use tags for polled commands? */
if (ecb->xs->xs_control & XS_CTL_POLL)
tag = 0;
#endif
s = splbio();
li = TINFO_LUN(ti, lun);
if (li == NULL) {
int wait = M_NOWAIT;
int flags = ecb->xs->xs_control;
/* Initialize LUN info and add to list. */
if ((curproc != NULL) && ((flags & XS_CTL_NOSLEEP) == 0))
wait = M_WAITOK;
if ((li = malloc(sizeof(*li), M_DEVBUF, M_NOWAIT)) == NULL) {
splx(s);
continue;
}
bzero(li, sizeof(*li));
li->lun = lun;
LIST_INSERT_HEAD(&ti->luns, li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = li;
}
li->last_used = time.tv_sec;
if (tag == 0) {
/* Try to issue this as an un-tagged command */
if (li->untagged == NULL)
li->untagged = ecb;
}
if (li->untagged != NULL) {
tag = 0;
if ((li->busy != 1) && li->used == 0) {
/* We need to issue this untagged command now */
ecb = li->untagged;
sc_link = ecb->xs->sc_link;
}
else {
/* Not ready yet */
splx(s);
continue;
}
}
ecb->tag[0] = tag;
if (tag != 0) {
int i;
/* Allocate a tag */
if (li->used == 255) {
/* no free tags */
splx(s);
continue;
}
/* Start from the last used location */
for (i = li->avail; i < 256; i++) {
if (li->queued[i] == NULL)
break;
}
/* Couldn't find one, start again from the beginning */
if (i == 256) {
for (i = 0; i < 256; i++) {
if (li->queued[i] == NULL)
break;
}
}
#ifdef DIAGNOSTIC
/* There's supposed to be at least 1 tag avail */
if (i == 256)
panic("ncr53c9x_sched: tag alloc failure\n");
#endif
/* Save where to start next time. */
li->avail = i+1;
li->used ++;
li->queued[i] = ecb;
ecb->tag[1] = i;
}
splx(s);
if (li->untagged != NULL && (li->busy != 1)) {
li->busy = 1;
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
ecb->flags &= ~ECB_READY;
sc->sc_nexus = ecb;
ncr53c9x_select(sc, ecb);
break;
}
if (li->untagged == NULL && tag != 0) {
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
ecb->flags &= ~ECB_READY;
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;
struct ncr53c9x_linfo *li;
int lun = sc_link->scsipi_scsi.lun;
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++;
li = TINFO_LUN(ti, lun);
if (li->busy) li->busy = 0;
ncr53c9x_dequeue(sc, ecb);
li->untagged = ecb; /* must be executed first to fix C/A */
li->busy = 2;
if (ecb == sc->sc_nexus) {
ncr53c9x_select(sc, ecb);
} else {
TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
ecb->flags |= ECB_READY;
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];
int lun = sc_link->scsipi_scsi.lun;
struct ncr53c9x_linfo *li = TINFO_LUN(ti, lun);
NCR_TRACE(("[ncr53c9x_done(error:%x)] ", xs->error));
callout_stop(&ecb->xs->xs_callout);
if (ecb->stat == SCSI_QUEUE_FULL) {
/*
* Set current throttle -- we should reset
* this periodically
*/
sc_link->openings = li->used - 1;
printf("\n%s: QFULL -- throttling to %d commands\n",
sc->sc_dev.dv_xname, sc_link->openings);
}
/*
* 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->xs_status |= XS_STS_DONE;
#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.
*/
ncr53c9x_dequeue(sc, ecb);
if (ecb == sc->sc_nexus) {
sc->sc_nexus = NULL;
if (sc->sc_state != NCR_CLEANING) {
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
}
}
if (xs->error == XS_SELTIMEOUT) {
/* Selection timeout -- discard this LUN if empty */
if (li->untagged == NULL && li->used == 0) {
if (lun < NCR_NLUN)
ti->lun[lun] = NULL;
LIST_REMOVE(li, link);
free(li, M_DEVBUF);
}
}
ncr53c9x_free_ecb(sc, ecb, xs->xs_control);
ti->cmds++;
scsipi_done(xs);
}
void
ncr53c9x_dequeue(sc, ecb)
struct ncr53c9x_softc *sc;
struct ncr53c9x_ecb *ecb;
{
struct ncr53c9x_tinfo *ti =
&sc->sc_tinfo[ecb->xs->sc_link->scsipi_scsi.target];
struct ncr53c9x_linfo *li;
int64_t lun = ecb->xs->sc_link->scsipi_scsi.lun;
li = TINFO_LUN(ti, lun);
#ifdef DIAGNOSTIC
if (li == NULL || li->lun != lun)
panic("ncr53c9x_dequeue: lun %qx for ecb %p does not exist\n",
(long long) lun, ecb);
#endif
if (li->untagged == ecb) {
li->busy = 0;
li->untagged = NULL;
}
if (ecb->tag[0] && li->queued[ecb->tag[1]] != NULL) {
#ifdef DIAGNOSTIC
if (li->queued[ecb->tag[1]] != NULL &&
(li->queued[ecb->tag[1]] != ecb))
panic("ncr53c9x_dequeue: slot %d for lun %qx has %p "
"instead of ecb %p\n", ecb->tag[1],
(long long) lun,
li->queued[ecb->tag[1]], ecb);
#endif
li->queued[ecb->tag[1]] = NULL;
li->used --;
}
if ((ecb->flags & ECB_READY) != 0) {
ecb->flags &= ~ECB_READY;
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 %x %d", m, __LINE__)); \
NCRCMD(sc, NCRCMD_SETATN); \
sc->sc_flags |= NCR_ATN; \
sc->sc_msgpriq |= (m); \
} while (0)
int
ncr53c9x_reselect(sc, message, tagtype, tagid)
struct ncr53c9x_softc *sc;
int message;
int tagtype, tagid;
{
u_char selid, target, lun;
struct ncr53c9x_ecb *ecb = NULL;
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_linfo *li;
/*
* 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;
ti = &sc->sc_tinfo[target];
li = TINFO_LUN(ti, lun);
/*
* We can get as far as the LUN with the IDENTIFY
* message. Check to see if we're running an
* un-tagged command. Otherwise ack the IDENTIFY
* and wait for a tag message.
*/
if (li != NULL) {
if (li->untagged != NULL && li->busy)
ecb = li->untagged;
else if (tagtype != MSG_SIMPLE_Q_TAG) {
/* Wait for tag to come by */
sc->sc_state = NCR_IDENTIFIED;
return (0);
} else if (tagtype)
ecb = li->queued[tagid];
}
if (ecb == NULL) {
printf("%s: reselect from target %d lun %d tag %x:%x with no nexus;"
" sending ABORT\n",
sc->sc_dev.dv_xname, target, lun, tagtype, tagid);
goto abort;
}
/* Make this nexus active again. */
sc->sc_state = NCR_CONNECTED;
sc->sc_nexus = ecb;
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)
struct ncr53c9x_softc *sc;
{
int v;
v = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF);
NCR_TRACE(("[ncr53c9x_msgin(curmsglen:%ld fifo:%d)] ",
(long)sc->sc_imlen, v));
if (v == 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) != 0) {
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) {
scsi_print_addr(ecb->xs->sc_link);
printf("got %ld extra bytes\n",
-(long)sc->sc_dleft);
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:
NCR_MSGS(("msg reject (msgout=%x) ", sc->sc_msgout));
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_HEAD_OF_Q_TAG:
case MSG_SIMPLE_Q_TAG:
case MSG_ORDERED_Q_TAG:
NCR_MSGS(("TAG %x:%x", sc->sc_imess[0], sc->sc_imess[1]));
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) {
#ifdef NCR53C9X_DEBUG
scsi_print_addr(ecb->xs->sc_link);
printf("async mode\n");
#endif
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:
scsi_print_addr(ecb->xs->sc_link);
printf("unrecognized MESSAGE EXTENDED;"
" sending REJECT\n");
goto reject;
}
break;
default:
NCR_MSGS(("ident "));
scsi_print_addr(ecb->xs->sc_link);
printf("unrecognized MESSAGE; sending REJECT\n");
reject:
ncr53c9x_sched_msgout(SEND_REJECT);
break;
}
break;
case NCR_RESELECTED:
case NCR_IDENTIFIED:
if (MSG_ISIDENTIFY(sc->sc_imess[0])) {
sc->sc_msgify = sc->sc_imess[0];
} else if (sc->sc_imess[0] == MSG_SIMPLE_Q_TAG) {
if (sc->sc_msgify == 0) {
printf("%s: TAG reselect without IDENTIFY;"
" MSG %x;"
" sending DEVICE RESET\n",
sc->sc_dev.dv_xname,
sc->sc_imess[0]);
goto reset;
}
} else {
printf("%s: reselect without IDENTIFY;"
" MSG %x;"
" sending DEVICE RESET\n",
sc->sc_dev.dv_xname,
sc->sc_imess[0]);
goto reset;
}
(void) ncr53c9x_reselect(sc, sc->sc_msgify,
sc->sc_imess[0],
sc->sc_imess[1]);
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)
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));
/*
* XXX - the NCR_ATN flag is not in sync with the actual ATN
* condition on the SCSI bus. The 53c9x chip
* automatically turns off ATN before sending the
* message byte. (see also the comment below in the
* default case when picking out a message to send)
*/
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_TAG:
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] = ecb->tag[0];
sc->sc_omess[1] = ecb->tag[1];
sc->sc_omlen = 2;
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;
if ((ti->flags & T_SYNCHOFF) == 0)
/* We can re-start sync negotiation */
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:
/*
* We normally do not get here, since the chip
* automatically turns off ATN before the last
* byte of a message is sent to the target.
* However, if the target rejects our (multi-byte)
* message early by switching to MSG IN phase
* ATN remains on, so the target may return to
* MSG OUT phase. If there are no scheduled messages
* left we send a NO-OP.
*
* XXX - Note that this leaves no useful purpose for
* the NCR_ATN flag.
*/
sc->sc_flags &= ~NCR_ATN;
sc->sc_omess[0] = MSG_NOOP;
break;
}
sc->sc_omp = sc->sc_omess;
}
#ifdef DEBUG
{
int i;
for (i = 0; i < sc->sc_omlen; i++)
NCR_MISC(("<msgbyte:0x%02x>", sc->sc_omess[i]));
}
#endif
/* (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 and start the message-out transfer */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
NCRCMD(sc, NCRCMD_TRANS|NCRCMD_DMA);
NCRDMA_GO(sc);
}
/*
* 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(arg)
void *arg;
{
struct ncr53c9x_softc *sc = arg;
struct ncr53c9x_ecb *ecb;
struct scsipi_link *sc_link;
struct ncr53c9x_tinfo *ti;
size_t size;
int nfifo;
NCR_TRACE(("[ncr53c9x_intr] "));
if (!NCRDMA_ISINTR(sc))
return (0);
again:
/* 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) != 0) {
if ((NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) != 0) {
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 != NULL)
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) != 0) {
/* Gross Error; 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) != 0) {
if ((sc->sc_flags & NCR_EXPECT_ILLCMD) != 0) {
/*
* 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;
return (1);
}
/* 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);
if ((sc->sc_espstat & NCRSTAT_TC) == 0) {
/*
* DMA not completed. If we can not find a
* acceptable explanation, print a diagnostic.
*/
if (sc->sc_state == NCR_SELECTING)
/*
* This can happen if we are reselected
* while using DMA to select a target.
*/
/*void*/;
else if (sc->sc_prevphase == MESSAGE_OUT_PHASE) {
/*
* Our (multi-byte) message (eg SDTR) was
* interrupted by the target to send
* a MSG REJECT.
* Print diagnostic if current phase
* is not MESSAGE IN.
*/
if (sc->sc_phase != MESSAGE_IN_PHASE)
printf("%s: !TC on MSG OUT"
" [intr %x, stat %x, step %d]"
" prevphase %x, resid %lx\n",
sc->sc_dev.dv_xname,
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase,
(u_long)sc->sc_omlen);
} else if (sc->sc_dleft == 0) {
/*
* The DMA operation was started for
* a DATA transfer. Print a diagnostic
* if the DMA counter and TC bit
* appear to be out of sync.
*/
printf("%s: !TC on DATA XFER"
" [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);
}
}
}
/*
* Check for less serious errors.
*/
if ((sc->sc_espstat & NCRSTAT_PE) != 0) {
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) != 0) {
sc->sc_msgify = 0;
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:
{
struct ncr53c9x_linfo *li;
ecb->xs->error = XS_SELTIMEOUT;
/* Selection timeout -- discard all LUNs if empty */
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->scsipi_scsi.target];
li = LIST_FIRST(&ti->luns);
while (li != NULL) {
if (li->untagged == NULL && li->used == 0) {
if (li->lun < NCR_NLUN)
ti->lun[li->lun] = NULL;
LIST_REMOVE(li, link);
free(li, M_DEVBUF);
/* Restart the search at the beginning */
li = LIST_FIRST(&ti->luns);
continue;
}
li = LIST_NEXT(li, link);
}
goto finish;
}
case NCR_CONNECTED:
if ((sc->sc_flags & NCR_SYNCHNEGO) != 0) {
#ifdef NCR53C9X_DEBUG
if (ecb != NULL)
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) != 0) {
printf("resetting\n");
goto reset;
}
printf("sending REQUEST SENSE\n");
callout_stop(&ecb->xs->xs_callout);
ncr53c9x_sense(sc, ecb);
goto out;
}
ecb->xs->error = XS_TIMEOUT;
goto finish;
case NCR_DISCONNECT:
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_IDENTIFIED:
ecb = sc->sc_nexus;
if (sc->sc_phase != MESSAGE_IN_PHASE) {
int i = (NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF);
/*
* Things are seriously fucked up.
* Pull the brakes, i.e. reset
*/
printf("%s: target didn't send tag: %d bytes in fifo\n",
sc->sc_dev.dv_xname, i);
/* Drain and display fifo */
while (i-- > 0)
printf("[%d] ", NCR_READ_REG(sc, NCR_FIFO));
ncr53c9x_init(sc, 1);
return (1);
} else
goto msgin;
break;
case NCR_IDLE:
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 "));
callout_stop(&ecb->xs->xs_callout);
ncr53c9x_dequeue(sc, ecb);
TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
ecb->flags |= ECB_READY;
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 &&
sc->sc_state != NCR_IDENTIFIED) {
/* IDENTIFY fail?! */
printf("%s: identify failed\n",
sc->sc_dev.dv_xname);
ncr53c9x_init(sc, 1);
return (1);
}
goto shortcut; /* ie. next phase expected soon */
}
#define NCRINTR_DONE (NCRINTR_FC|NCRINTR_BS)
if ((sc->sc_espintr & NCRINTR_DONE) == NCRINTR_DONE) {
/*
* Arbitration won; examine the `step' register
* to determine how far the selection could progress.
*/
ecb = sc->sc_nexus;
if (ecb == NULL)
panic("ncr53c9x: no 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;
if (ecb->tag[0])
ncr53c9x_sched_msgout(SEND_TAG|SEND_SDTR);
else
ncr53c9x_sched_msgout(SEND_SDTR);
sc->sc_prevphase = MESSAGE_OUT_PHASE; /* XXXX */
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);
break;
case 4:
if (ncr53c9x_dmaselect &&
sc->sc_cmdlen != 0)
printf("(%s:%d:%d): select; "
"%lu left in DMA buffer "
"[intr %x, stat %x, step %d]\n",
sc->sc_dev.dv_xname,
sc_link->scsipi_scsi.target,
sc_link->scsipi_scsi.lun,
(u_long)sc->sc_cmdlen,
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep);
/* So far, everything went fine */
break;
}
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) != 0) {
/* "Initiate Command Complete Steps" in progress */
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) {
/* Drop excess bytes from the queue */
int i = (NCR_READ_REG(sc, NCR_FFLAG)
& NCRFIFO_FF) - 2;
while (i-- > 0)
(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);
goto shortcut; /* 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("ncr53c9x: 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:
msgin:
NCR_PHASE(("MESSAGE_IN_PHASE "));
sc->sc_prevphase = MESSAGE_IN_PHASE;
if ((sc->sc_espintr & NCRINTR_BS) != 0) {
NCRCMD(sc, NCRCMD_FLUSH);
sc->sc_flags |= NCR_WAITI;
NCRCMD(sc, NCRCMD_TRANS);
} else if ((sc->sc_espintr & NCRINTR_FC) != 0) {
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);
}
goto shortcut; /* i.e. expect data to be ready */
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 to 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);
}
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* start the command transfer */
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) != 0) {
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;
goto shortcut; /* i.e. expect status results soon */
break;
case INVALID_PHASE:
break;
default:
printf("%s: unexpected bus phase; resetting\n",
sc->sc_dev.dv_xname);
goto reset;
}
out:
return (1);
reset:
ncr53c9x_init(sc, 1);
goto out;
finish:
ncr53c9x_done(sc, ecb);
goto out;
sched:
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
goto out;
shortcut:
/*
* 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 a heuristic. It is 2 when at 20Mhz, 2 at 25Mhz and 1
* at 40Mhz. This needs testing.
*/
DELAY(50/sc->sc_freq);
if (NCRDMA_ISINTR(sc))
goto again;
goto out;
}
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) {
int timeout;
/*
* 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.
*/
timeout = ecb->timeout;
if (hz > 100 && timeout > 1000)
timeout = (timeout / 1000) * hz;
else
timeout = (timeout * hz) / 1000;
callout_reset(&ecb->xs->xs_callout, timeout,
ncr53c9x_timeout, ecb);
} else {
/*
* Just leave the command where it is.
* XXX - what choice do we have but to reset the SCSI
* eventually?
*/
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(l %x, 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,
NCR_READ_REG(sc, NCR_STAT),
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);
}
void
ncr53c9x_watch(arg)
void *arg;
{
struct ncr53c9x_softc *sc = (struct ncr53c9x_softc *)arg;
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_linfo *li;
int t, s;
/* Delete any structures that have not been used in 10min. */
time_t old = time.tv_sec - (10*60);
s = splbio();
for (t=0; t<NCR_NTARG; t++) {
ti = &sc->sc_tinfo[t];
li = LIST_FIRST(&ti->luns);
while (li) {
if (li->last_used < old && li->untagged == NULL &&
li->used == 0) {
if (li->lun < NCR_NLUN)
ti->lun[li->lun] = NULL;
LIST_REMOVE(li, link);
free(li, M_DEVBUF);
/* Restart the search at the beginning */
li = LIST_FIRST(&ti->luns);
continue;
}
li = LIST_NEXT(li, link);
}
}
splx(s);
callout_reset(&sc->sc_watchdog, 60*hz, ncr53c9x_watch, sc);
}
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