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src/sys/dev/ic/ncr53c9x.c

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/* $OpenBSD: ncr53c9x.c,v 1.82 2024/04/13 23:44:11 jsg Exp $ */
/* $NetBSD: ncr53c9x.c,v 1.56 2000/11/30 14:41:46 thorpej 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.
*
* 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/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/pool.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_message.h>
#include <machine/cpu.h>
#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
#ifdef NCR53C9X_DEBUG
int ncr53c9x_debug = 0; /*NCR_SHOWPHASE|NCR_SHOWMISC|NCR_SHOWTRAC|NCR_SHOWCMDS;*/
#endif
#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 scsi_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_abort(struct ncr53c9x_softc *,
struct ncr53c9x_ecb *);
/*static*/ void ncr53c9x_dequeue(struct ncr53c9x_softc *,
struct ncr53c9x_ecb *);
void ncr53c9x_sense(struct ncr53c9x_softc *,
struct ncr53c9x_ecb *);
void ncr53c9x_free_ecb(void *, void *);
void *ncr53c9x_get_ecb(void *);
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 void ncr53c9x_wrfifo(struct ncr53c9x_softc *, u_char *, int);
static int ncr53c9x_rdfifo(struct ncr53c9x_softc *, int);
#define NCR_RDFIFO_START 0
#define NCR_RDFIFO_CONTINUE 1
#define NCR_SET_COUNT(sc, size) do { \
NCR_WRITE_REG((sc), NCR_TCL, (size)); \
NCR_WRITE_REG((sc), NCR_TCM, (size) >> 8); \
if ((sc->sc_cfg2 & NCRCFG2_FE) || \
(sc->sc_rev == NCR_VARIANT_FAS366)) { \
NCR_WRITE_REG((sc), NCR_TCH, (size) >> 16); \
} \
if (sc->sc_rev == NCR_VARIANT_FAS366) { \
NCR_WRITE_REG(sc, NCR_RCH, 0); \
} \
} while (0)
static int ecb_pool_initialized = 0;
static struct scsi_iopool ecb_iopool;
static struct pool ecb_pool;
struct cfdriver esp_cd = {
NULL, "esp", DV_DULL
};
void ncr53c9x_scsi_cmd(struct scsi_xfer *);
int ncr53c9x_scsi_probe(struct scsi_link *);
void ncr53c9x_scsi_free(struct scsi_link *);
const struct scsi_adapter ncr53c9x_switch = {
ncr53c9x_scsi_cmd, NULL, ncr53c9x_scsi_probe,
ncr53c9x_scsi_free, NULL
};
/*
* Names for the NCR53c9x variants, corresponding to the variant tags
* in ncr53c9xvar.h.
*/
const char *ncr53c9x_variant_names[] = {
"ESP100",
"ESP100A",
"ESP200",
"NCR53C94",
"NCR53C96",
"ESP406",
"FAS408",
"FAS216",
"AM53C974",
"FAS366/HME",
};
/*
* Search linked list for LUN info by LUN id.
*/
static struct ncr53c9x_linfo *
ncr53c9x_lunsearch(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(struct ncr53c9x_softc *sc)
{
struct scsibus_attach_args saa;
/*
* Allocate SCSI message buffers.
* Front-ends can override allocation to avoid alignment
* handling in the DMA engines. Note 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\n", ncr53c9x_variant_names[sc->sc_rev],
sc->sc_freq);
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:
*
* (timeout 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;
/* Find how many targets we need to support */
switch (sc->sc_rev) {
case NCR_VARIANT_FAS366:
sc->sc_ntarg = 16;
break;
default:
sc->sc_ntarg = 8;
break;
}
/* Reset state & bus */
sc->sc_cfflags = sc->sc_dev.dv_cfdata->cf_flags;
sc->sc_state = 0;
ncr53c9x_init(sc, 1);
saa.saa_adapter_softc = sc;
saa.saa_adapter_target = sc->sc_id;
saa.saa_adapter = &ncr53c9x_switch;
saa.saa_adapter_buswidth = sc->sc_ntarg;
saa.saa_luns = 8;
saa.saa_openings = 2;
saa.saa_pool = &ecb_iopool;
saa.saa_quirks = saa.saa_flags = 0;
saa.saa_wwpn = saa.saa_wwnn = 0;
config_found(&sc->sc_dev, &saa, scsiprint);
}
/*
* 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(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:
sc->sc_features |= NCR_F_SELATN3;
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;
case NCR_VARIANT_FAS366:
sc->sc_features |=
NCR_F_SELATN3 | NCR_F_HASCFG3 | NCR_F_FASTSCSI;
sc->sc_cfg3 = NCRFASCFG3_FASTCLK | NCRFASCFG3_OBAUTO;
sc->sc_cfg3_fscsi = NCRFASCFG3_FASTSCSI;
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
sc->sc_cfg2 = 0; /* NCRCFG2_HMEFE | NCRCFG2_HME32 */
NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2);
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);
#if 0
printf("%s: ncr53c9x_reset: revision %d\n",
sc->sc_dev.dv_xname, sc->sc_rev);
printf("%s: ncr53c9x_reset: cfg1 0x%x, cfg2 0x%x, cfg3 0x%x, ccf 0x%x, timeout 0x%x\n",
sc->sc_dev.dv_xname,
sc->sc_cfg1, sc->sc_cfg2, sc->sc_cfg3,
sc->sc_ccf, sc->sc_timeout);
#endif
}
/*
* Reset the SCSI bus, but not the chip
*/
void
ncr53c9x_scsi_reset(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(struct ncr53c9x_softc *sc, int doreset)
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
int r, i;
NCR_TRACE(("[NCR_INIT(%d) %d] ", doreset, sc->sc_state));
if (!ecb_pool_initialized) {
/* All instances share this pool */
pool_init(&ecb_pool, sizeof(struct ncr53c9x_ecb), 0, IPL_BIO,
0, "ncr53c9x_ecb", NULL);
scsi_iopool_init(&ecb_iopool, NULL,
ncr53c9x_get_ecb, ncr53c9x_free_ecb);
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 < sc->sc_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);
}
for (r = 0; r < sc->sc_ntarg; r++) {
LIST_FOREACH(li, &sc->sc_tinfo[r].luns, link) {
if ((ecb = li->untagged)) {
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 < sc->sc_ntarg; 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))) &&
sc->sc_minsync) ? 0 : T_SYNCHOFF) |
((sc->sc_cfflags & (1 << r)) ? T_RSELECTOFF : 0) |
T_NEED_TO_RESET;
#ifdef DEBUG
if (ncr53c9x_notag)
ti->flags &= ~T_TAG;
#endif
ti->period = sc->sc_minsync;
ti->offset = 0;
ti->cfg3 = 0;
}
if (doreset) {
sc->sc_state = NCR_SBR;
NCRCMD(sc, NCRCMD_RSTSCSI);
/*
* XXX gross...
* On some systems, commands issued too close to a reset
* do not work correctly. We'll force a short delay on
* known-to-be-sensitive chips.
*/
switch (sc->sc_rev) {
case NCR_VARIANT_NCR53C94:
DELAY(600000); /* 600ms */
break;
case NCR_VARIANT_NCR53C96:
DELAY(100000); /* 100ms */
break;
}
} 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(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;
if (sc->sc_rev == NCR_VARIANT_FAS366)
sc->sc_espstat2 = NCR_READ_REG(sc, NCR_STAT2);
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,stat2=%02x] ",
sc->sc_espintr, sc->sc_espstat, sc->sc_espstep, sc->sc_espstat2));
}
/*
* Convert Synchronous Transfer Period to chip register Clock Per Byte value.
*/
static inline int
ncr53c9x_stp2cpb(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(struct ncr53c9x_softc *sc, struct ncr53c9x_tinfo *ti)
{
u_char syncoff, synctp;
u_char cfg3 = sc->sc_cfg3 | ti->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_rev == NCR_VARIANT_AM53C974) ?
NCRAMDCFG3_FSCSI : NCRCFG3_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);
}
/*
* 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(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct scsi_link *sc_link = ecb->xs->sc_link;
int target = sc_link->target;
int lun = sc_link->lun;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[target];
int tiflags = ti->flags;
u_char *cmd;
int clen;
int selatn3, selatns;
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->flags & SCSI_POLL) == 0) {
int timeout = ecb->xs->timeout;
if (timeout > 1000000)
timeout = (timeout / 1000) * hz;
else
timeout = (timeout * hz) / 1000;
timeout_add(&ecb->xs->stimeout, timeout);
}
/*
* The docs say the target register is never reset, and I
* can't think of a better place to set it
*/
if (sc->sc_rev == NCR_VARIANT_FAS366) {
NCRCMD(sc, NCRCMD_FLUSH);
NCR_WRITE_REG(sc, NCR_SELID, target | NCR_BUSID_HME);
} else {
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 (sc->sc_features & NCR_F_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_SET_COUNT(sc, dmasize);
if (sc->sc_rev != NCR_VARIANT_FAS366)
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* And get the targets attention */
NCRCMD(sc, NCRCMD_SELNATN | NCRCMD_DMA);
NCRDMA_GO(sc);
} else {
ncr53c9x_wrfifo(sc, (u_char *)&ecb->cmd.cmd, ecb->clen);
sc->sc_cmdlen = 0;
NCRCMD(sc, NCRCMD_SELNATN);
}
return;
}
selatn3 = selatns = 0;
if (ecb->tag[0] != 0) {
if (sc->sc_features & NCR_F_SELATN3)
/* use SELATN3 to send tag messages */
selatn3 = 1;
else
/* We don't have SELATN3; use SELATNS to send tags */
selatns = 1;
}
if (ti->flags & T_NEGOTIATE) {
/* We have to use SELATNS to send sync/wide messages */
selatn3 = 0;
selatns = 1;
}
cmd = (u_char *)&ecb->cmd.cmd;
if (selatn3) {
/* We'll use tags with SELATN3 */
clen = ecb->clen + 3;
cmd -= 3;
cmd[0] = MSG_IDENTIFY(lun, 1); /* msg[0] */
cmd[1] = ecb->tag[0]; /* msg[1] */
cmd[2] = ecb->tag[1]; /* msg[2] */
} else {
/* We don't have tags, or will send messages with SELATNS */
clen = ecb->clen + 1;
cmd -= 1;
cmd[0] = MSG_IDENTIFY(lun, (tiflags & T_RSELECTOFF) == 0);
}
if ((sc->sc_features & NCR_F_DMASELECT) && !selatns) {
/* 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_SET_COUNT(sc, dmasize);
/* load the count in */
/* if (sc->sc_rev != NCR_VARIANT_FAS366) */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* And get the targets attention */
if (selatn3) {
sc->sc_msgout = SEND_TAG;
sc->sc_flags |= NCR_ATN;
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.
*/
/* Now get the command into the FIFO */
sc->sc_cmdlen = 0;
ncr53c9x_wrfifo(sc, cmd, clen);
/* And get the targets attention */
if (selatns) {
NCR_MISC(("SELATNS \n"));
/* Arbitrate, select and stop after IDENTIFY message */
NCRCMD(sc, NCRCMD_SELATNS);
} else if (selatn3) {
sc->sc_msgout = SEND_TAG;
sc->sc_flags |= NCR_ATN;
NCRCMD(sc, NCRCMD_SELATN3);
} else
NCRCMD(sc, NCRCMD_SELATN);
}
/*
* DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS
*/
void *
ncr53c9x_get_ecb(void *null)
{
struct ncr53c9x_ecb *ecb;
ecb = pool_get(&ecb_pool, M_NOWAIT|M_ZERO);
if (ecb == NULL)
return (NULL);
ecb->flags |= ECB_ALLOC;
return (ecb);
}
void
ncr53c9x_free_ecb(void *null, void *ecb)
{
pool_put(&ecb_pool, ecb);
}
int
ncr53c9x_scsi_probe(struct scsi_link *sc_link)
{
struct ncr53c9x_softc *sc = sc_link->bus->sb_adapter_softc;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target];
struct ncr53c9x_linfo *li;
int64_t lun = sc_link->lun;
int s;
/* Initialize LUN info and add to list. */
li = malloc(sizeof(*li), M_DEVBUF, M_WAITOK | M_ZERO);
if (li == NULL)
return (ENOMEM);
li->last_used = getuptime();
li->lun = lun;
s = splbio();
LIST_INSERT_HEAD(&ti->luns, li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = li;
splx(s);
return (0);
}
void
ncr53c9x_scsi_free(struct scsi_link *sc_link)
{
struct ncr53c9x_softc *sc = sc_link->bus->sb_adapter_softc;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target];
struct ncr53c9x_linfo *li;
int64_t lun = sc_link->lun;
int s;
s = splbio();
li = TINFO_LUN(ti, lun);
LIST_REMOVE(li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = NULL;
splx(s);
free(li, M_DEVBUF, 0);
}
/*
* Start a SCSI-command
* This function is called by the higher level SCSI-driver to queue/run
* SCSI-commands.
*/
void
ncr53c9x_scsi_cmd(struct scsi_xfer *xs)
{
struct scsi_link *sc_link = xs->sc_link;
struct ncr53c9x_softc *sc = sc_link->bus->sb_adapter_softc;
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_linfo *li;
int64_t lun = sc_link->lun;
int s, flags;
NCR_TRACE(("[ncr53c9x_scsi_cmd] "));
NCR_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd.opcode, xs->cmdlen,
sc_link->target));
/*
* Commands larger than 12 bytes seem to confuse the chip
* (at least on FAS366 flavours).
*/
if (xs->cmdlen > 12) {
memset(&xs->sense, 0, sizeof(xs->sense));
/* sense data borrowed from gdt(4) */
xs->sense.error_code = SSD_ERRCODE_VALID | SSD_ERRCODE_CURRENT;
xs->sense.flags = SKEY_ILLEGAL_REQUEST;
xs->sense.add_sense_code = 0x20; /* illcmd */
xs->error = XS_SENSE;
scsi_done(xs);
return;
}
flags = xs->flags;
ti = &sc->sc_tinfo[sc_link->target];
li = TINFO_LUN(ti, lun);
/* Initialize ecb */
ecb = xs->io;
ecb->xs = xs;
timeout_set(&xs->stimeout, ncr53c9x_timeout, ecb);
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);
ecb->flags |= ECB_READY;
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
splx(s);
if ((flags & SCSI_POLL) == 0)
return;
/* Not allowed to use interrupts, use polling instead */
if (ncr53c9x_poll(sc, xs, xs->timeout)) {
ncr53c9x_timeout(ecb);
if (ncr53c9x_poll(sc, xs, xs->timeout))
ncr53c9x_timeout(ecb);
}
}
/*
* Used when interrupt driven I/O isn't allowed, e.g. during boot.
*/
int
ncr53c9x_poll(struct ncr53c9x_softc *sc, struct scsi_xfer *xs, int count)
{
int s;
NCR_TRACE(("[ncr53c9x_poll] "));
while (count) {
if (NCRDMA_ISINTR(sc)) {
s = splbio();
ncr53c9x_intr(sc);
splx(s);
}
#if alternatively
if (NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT) {
s = splbio();
ncr53c9x_intr(sc);
splx(s);
}
#endif
if ((xs->flags & ITSDONE) != 0)
return (0);
s = splbio();
if (sc->sc_state == NCR_IDLE) {
NCR_TRACE(("[ncr53c9x_poll: rescheduling] "));
ncr53c9x_sched(sc);
}
splx(s);
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 unnecessary interrupt just to get things going.
* Should only be called when state == NCR_IDLE and at bio pl.
*/
void
ncr53c9x_sched(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_ecb *ecb;
struct scsi_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.
*/
TAILQ_FOREACH(ecb, &sc->ready_list, chain) {
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
lun = sc_link->lun;
/* Select type of tag for this command */
if ((ti->flags & (T_RSELECTOFF)) != 0)
tag = 0;
else if ((ti->flags & T_TAG) == 0)
tag = 0;
else if ((ecb->flags & ECB_SENSE) != 0)
tag = 0;
else
tag = MSG_SIMPLE_Q_TAG;
#if 0
/* XXXX Use tags for polled commands? */
if (ecb->xs->flags & SCSI_POLL)
tag = 0;
#endif
s = splbio();
li = TINFO_LUN(ti, lun);
if (!li) {
/* Initialize LUN info and add to list. */
if ((li = malloc(sizeof(*li), M_DEVBUF,
M_NOWAIT | M_ZERO)) == NULL) {
splx(s);
continue;
}
li->lun = lun;
LIST_INSERT_HEAD(&ti->luns, li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = li;
}
li->last_used = getuptime();
if (!tag) {
/* Try to issue this as an un-tagged command */
if (!li->untagged)
li->untagged = ecb;
}
if (li->untagged) {
tag = 0;
if ((li->busy != 1) && !li->used) {
/* 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) {
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
if (i == 256)
panic("ncr53c9x_sched: tag alloc failure");
#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 && (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 && tag) {
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->target,
sc_link->lun));
}
}
void
ncr53c9x_sense(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct scsi_xfer *xs = ecb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target];
struct scsi_sense *ss = (void *)&ecb->cmd.cmd;
struct ncr53c9x_linfo *li;
int lun = sc_link->lun;
NCR_MISC(("requesting sense "));
/* Next, setup a request sense command block */
bzero(ss, sizeof(*ss));
ss->opcode = REQUEST_SENSE;
ss->byte2 = sc_link->lun << 5;
ss->length = sizeof(struct scsi_sense_data);
ecb->clen = sizeof(*ss);
ecb->daddr = (char *)&xs->sense;
ecb->dleft = sizeof(struct scsi_sense_data);
ecb->flags |= ECB_SENSE;
xs->timeout = NCR_SENSE_TIMEOUT;
ti->senses++;
li = TINFO_LUN(ti, lun);
if (li->busy) li->busy = 0;
ncr53c9x_dequeue(sc, ecb);
li->untagged = ecb;
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(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct scsi_xfer *xs = ecb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target];
int lun = sc_link->lun;
struct ncr53c9x_linfo *li = TINFO_LUN(ti, lun);
NCR_TRACE(("[ncr53c9x_done(error:%x)] ", xs->error));
timeout_del(&ecb->xs->stimeout);
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;
}
}
#ifdef NCR53C9X_DEBUG
if (ncr53c9x_debug & NCR_SHOWMISC) {
if (xs->resid != 0)
printf("resid=%lu ", (unsigned long)xs->resid);
if (xs->error == XS_SENSE)
printf("sense=0x%02x\n", xs->sense.error_code);
else
printf("error=%d\n", xs->error);
}
#endif
/*
* Remove the 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);
}
}
ti->cmds++;
scsi_done(xs);
}
void
ncr53c9x_dequeue(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct ncr53c9x_tinfo *ti =
&sc->sc_tinfo[ecb->xs->sc_link->target];
struct ncr53c9x_linfo *li;
int64_t lun = ecb->xs->sc_link->lun;
li = TINFO_LUN(ti, lun);
#ifdef DIAGNOSTIC
if ((!li) || (li->lun != lun))
panic("ncr53c9x_dequeue: lun %llx for ecb %p does not exist",
(long long)lun, ecb);
#endif
if (li->untagged == ecb) {
li->busy = 0;
li->untagged = NULL;
}
if (ecb->tag[0] && li->queued[ecb->tag[1]]) {
#ifdef DIAGNOSTIC
if (li->queued[ecb->tag[1]] && (li->queued[ecb->tag[1]] != ecb))
panic("ncr53c9x_dequeue: slot %d for lun %llx has %p "
"instead of ecb %p", 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) {
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)
static void
ncr53c9x_flushfifo(struct ncr53c9x_softc *sc)
{
NCR_MISC(("[flushfifo] "));
NCRCMD(sc, NCRCMD_FLUSH);
if (sc->sc_phase == COMMAND_PHASE ||
sc->sc_phase == MESSAGE_OUT_PHASE)
DELAY(2);
}
static int
ncr53c9x_rdfifo(struct ncr53c9x_softc *sc, int how)
{
int i, n;
u_char *buf;
switch(how) {
case NCR_RDFIFO_START:
buf = sc->sc_imess;
sc->sc_imlen = 0;
break;
case NCR_RDFIFO_CONTINUE:
buf = sc->sc_imess + sc->sc_imlen;
break;
default:
panic("ncr53c9x_rdfifo: bad flag");
break;
}
/*
* XXX buffer (sc_imess) size for message
*/
n = NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF;
if (sc->sc_rev == NCR_VARIANT_FAS366) {
n *= 2;
for (i = 0; i < n; i++)
buf[i] = NCR_READ_REG(sc, NCR_FIFO);
if (sc->sc_espstat2 & FAS_STAT2_ISHUTTLE) {
NCR_WRITE_REG(sc, NCR_FIFO, 0);
buf[i++] = NCR_READ_REG(sc, NCR_FIFO);
NCR_READ_REG(sc, NCR_FIFO);
ncr53c9x_flushfifo(sc);
}
} else {
for (i = 0; i < n; i++)
buf[i] = NCR_READ_REG(sc, NCR_FIFO);
}
sc->sc_imlen += i;
#ifdef NCR53C9X_DEBUG
{
int j;
NCR_TRACE(("\n[rdfifo %s (%d):",
(how == NCR_RDFIFO_START) ? "start" : "cont",
(int)sc->sc_imlen));
if (ncr53c9x_debug & NCR_SHOWTRAC) {
for (j = 0; j < sc->sc_imlen; j++)
printf(" %02x", sc->sc_imess[j]);
printf("]\n");
}
}
#endif
return sc->sc_imlen;
}
static void
ncr53c9x_wrfifo(struct ncr53c9x_softc *sc, u_char *p, int len)
{
int i;
#ifdef NCR53C9X_DEBUG
NCR_MISC(("[wrfifo(%d):", len));
if (ncr53c9x_debug & NCR_SHOWTRAC) {
for (i = 0; i < len; i++)
printf(" %02x", p[i]);
printf("]\n");
}
#endif
for (i = 0; i < len; i++) {
NCR_WRITE_REG(sc, NCR_FIFO, p[i]);
if (sc->sc_rev == NCR_VARIANT_FAS366)
NCR_WRITE_REG(sc, NCR_FIFO, 0);
}
}
int
ncr53c9x_reselect(struct ncr53c9x_softc *sc, int message, int tagtype,
int tagid)
{
u_char selid, target, lun;
struct ncr53c9x_ecb *ecb = NULL;
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_linfo *li;
if (sc->sc_rev == NCR_VARIANT_FAS366) {
target = sc->sc_selid;
} else {
/*
* 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;
}
target = ffs(selid) - 1;
}
lun = message & 0x07;
/*
* 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.
*/
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);
}
static inline int
__verify_msg_format(u_char *p, int len)
{
if (len == 1 && IS1BYTEMSG(p[0]))
return 1;
if (len == 2 && IS2BYTEMSG(p[0]))
return 1;
if (len >= 3 && ISEXTMSG(p[0]) &&
len == p[1] + 2)
return 1;
return 0;
}
/*
* 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(struct ncr53c9x_softc *sc)
{
NCR_TRACE(("[ncr53c9x_msgin(curmsglen:%ld)] ", (long)sc->sc_imlen));
if (sc->sc_imlen == 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_state != NCR_RESELECTED) {
printf("%s: phase change, dropping message, prev %d, state %d\n",
sc->sc_dev.dv_xname, sc->sc_prevphase, sc->sc_state);
sc->sc_flags &= ~NCR_DROP_MSGI;
sc->sc_imlen = 0;
}
NCR_TRACE(("<msgbyte:0x%02x>", sc->sc_imess[0]));
/*
* 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 {
u_char *pb;
int plen;
switch (sc->sc_state) {
/*
* if received message is the first of reselection
* then first byte is selid, and then message
*/
case NCR_RESELECTED:
pb = sc->sc_imess + 1;
plen = sc->sc_imlen - 1;
break;
default:
pb = sc->sc_imess;
plen = sc->sc_imlen;
break;
}
if (__verify_msg_format(pb, plen))
goto gotit;
}
/* Ack what we have so far */
NCRCMD(sc, NCRCMD_MSGOK);
return;
gotit:
NCR_MSGS(("gotmsg(%x) state %d", sc->sc_imess[0], sc->sc_state));
/* we got complete message, flush the imess, XXX nobody uses imlen below */
sc->sc_imlen = 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;
struct ncr53c9x_linfo *li;
int lun;
case NCR_CONNECTED:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->target];
switch (sc->sc_imess[0]) {
case MSG_CMDCOMPLETE:
NCR_MSGS(("cmdcomplete "));
if (sc->sc_dleft < 0) {
sc_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_TAG:
/* Target does not like tagged queuing.
* - Flush the command queue
* - Disable tagged queuing for the target
* - Dequeue ecb from the queued array.
*/
printf("%s: tagged queuing rejected: target %d\n",
sc->sc_dev.dv_xname, ecb->xs->sc_link->target);
NCR_MSGS(("(rejected sent tag)"));
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
ti->flags &= ~T_TAG;
lun = ecb->xs->sc_link->lun;
li = TINFO_LUN(ti, lun);
if (ecb->tag[0] &&
li->queued[ecb->tag[1]] != NULL) {
li->queued[ecb->tag[1]] = NULL;
li->used--;
}
ecb->tag[0] = ecb->tag[1] = 0;
li->untagged = ecb;
li->busy = 1;
break;
case SEND_SDTR:
printf("%s: sync transfer rejected: target %d\n",
sc->sc_dev.dv_xname, ecb->xs->sc_link->target);
sc->sc_flags &= ~NCR_SYNCHNEGO;
ti->flags &= ~(T_NEGOTIATE | T_SYNCMODE);
ncr53c9x_setsync(sc, ti);
break;
case SEND_WDTR:
printf("%s: wide transfer rejected: target %d\n",
sc->sc_dev.dv_xname, ecb->xs->sc_link->target);
ti->flags &= ~T_WIDE;
ti->width = 0;
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
sc_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 {
#ifdef NCR53C9X_DEBUG
int r, s;
#endif
int p;
p = ncr53c9x_stp2cpb(sc, ti->period);
ti->period = ncr53c9x_cpb2stp(sc, p);
#ifdef NCR53C9X_DEBUG
sc_print_addr(ecb->xs->sc_link);
r = 250/ti->period;
s = (100*250)/ti->period - 100*r;
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;
case MSG_EXT_WDTR:
printf("%s: wide mode %d\n",
sc->sc_dev.dv_xname, sc->sc_imess[3]);
if (sc->sc_imess[3] == 1) {
ti->cfg3 |= NCRFASCFG3_EWIDE;
ncr53c9x_setsync(sc, ti);
} else
ti->width = 0;
ti->flags &= ~T_WIDE;
break;
default:
sc_print_addr(ecb->xs->sc_link);
printf("unrecognized MESSAGE EXTENDED;"
" sending REJECT\n");
goto reject;
}
break;
default:
NCR_MSGS(("ident "));
sc_print_addr(ecb->xs->sc_link);
printf("unrecognized MESSAGE; sending REJECT\n");
reject:
ncr53c9x_sched_msgout(SEND_REJECT);
break;
}
break;
case NCR_IDENTIFIED:
/*
* IDENTIFY message was received and queue tag is expected now
*/
if ((sc->sc_imess[0] != MSG_SIMPLE_Q_TAG) ||
(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;
}
(void) ncr53c9x_reselect(sc, sc->sc_msgify,
sc->sc_imess[0], sc->sc_imess[1]);
break;
case NCR_RESELECTED:
if (MSG_ISIDENTIFY(sc->sc_imess[1])) {
sc->sc_msgify = sc->sc_imess[1];
} else {
printf("%s: reselect without IDENTIFY;"
" MSG %x;"
" sending DEVICE RESET\n",
sc->sc_dev.dv_xname,
sc->sc_imess[1]);
goto reset;
}
(void) ncr53c9x_reselect(sc, sc->sc_msgify, 0, 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;
}
/* if we have more messages to send set ATN */
if (sc->sc_msgpriq)
NCRCMD(sc, NCRCMD_SETATN);
/* 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(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->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_WDTR:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->target];
sc->sc_omess[0] = MSG_EXTENDED;
sc->sc_omess[1] = 2;
sc->sc_omess[2] = MSG_EXT_WDTR;
sc->sc_omess[3] = ti->width;
sc->sc_omlen = 4;
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->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->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
if (sc->sc_rev == NCR_VARIANT_FAS366) {
/*
* XXX fifo size
*/
ncr53c9x_flushfifo(sc);
ncr53c9x_wrfifo(sc, sc->sc_omp, sc->sc_omlen);
sc->sc_cmdlen = 0;
NCRCMD(sc, NCRCMD_TRANS);
} else {
/* (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_SET_COUNT(sc, size);
/* 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 sdebug = 0;
int
ncr53c9x_intr(void *arg)
{
struct ncr53c9x_softc *sc = arg;
struct ncr53c9x_ecb *ecb;
struct scsi_link *sc_link;
struct ncr53c9x_tinfo *ti;
size_t size;
int nfifo;
NCR_TRACE(("[ncr53c9x_intr: state %d] ", sc->sc_state));
if (!NCRDMA_ISINTR(sc))
return (0);
again:
/* and what do the registers say... */
ncr53c9x_readregs(sc);
/*
* 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) {
/* 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) {
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;
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);
return (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) {
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) {
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:
ecb->xs->error = XS_SELTIMEOUT;
goto finish;
case NCR_CONNECTED:
if ((sc->sc_flags & NCR_SYNCHNEGO)) {
#ifdef NCR53C9X_DEBUG
if (ecb)
sc_print_addr(ecb->xs->sc_link);
printf("sync nego not completed!\n");
#endif
ti = &sc->sc_tinfo[ecb->xs->sc_link->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");
timeout_del(&ecb->xs->stimeout);
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:
ecb = sc->sc_nexus;
if (sc->sc_espintr & NCRINTR_RESEL) {
sc->sc_msgpriq = sc->sc_msgout = sc->sc_msgoutq = 0;
sc->sc_flags = 0;
/*
* 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 "));
timeout_del(&ecb->xs->stimeout);
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 = ncr53c9x_rdfifo(sc, NCR_RDFIFO_START);
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 = sc->sc_imess[0];
NCR_MISC(("selid=%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 (sc->sc_features & NCR_F_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, state %d, intr %02x\n",
sc->sc_dev.dv_xname, sc->sc_state,
sc->sc_espintr);
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)
panic("ncr53c9x: no nexus");
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->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 &&
ecb->tag[0] == 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;
}
if (ti->flags & T_WIDE) {
ncr53c9x_sched_msgout(SEND_WDTR);
}
if (ti->flags & T_NEGOTIATE) {
/* 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);
} else {
/* Could not do ATN3 so send TAG */
ncr53c9x_sched_msgout(SEND_TAG);
}
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 (sc->sc_features & NCR_F_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->target,
sc_link->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 (sc->sc_features & NCR_F_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->target,
sc_link->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) {
/* "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);
}
ncr53c9x_rdfifo(sc, NCR_RDFIFO_START);
if (sc->sc_imlen < 2)
printf("%s: can't get status, only %d bytes\n",
sc->sc_dev.dv_xname, (int)sc->sc_imlen);
ecb->stat = sc->sc_imess[sc->sc_imlen - 2];
msg = sc->sc_imess[sc->sc_imlen - 1];
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);
sc->sc_imlen = 0;
NCRCMD(sc, NCRCMD_MSGOK);
goto shortcut; /* ie. wait for disconnect */
}
break;
default:
/* Don't panic: reset. */
printf("%s: invalid state: %d\n",
sc->sc_dev.dv_xname,
sc->sc_state);
ncr53c9x_scsi_reset(sc);
goto out;
break;
}
/*
* 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 "));
if (sc->sc_espintr & NCRINTR_BS) {
if ((sc->sc_rev != NCR_VARIANT_FAS366) ||
!(sc->sc_espstat2 & FAS_STAT2_EMPTY)) {
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_rdfifo(sc,
(sc->sc_prevphase == sc->sc_phase) ?
NCR_RDFIFO_CONTINUE : NCR_RDFIFO_START);
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;
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 (sc->sc_features & NCR_F_DMASELECT) {
/* 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_SET_COUNT(sc, size);
/* load the count in */
NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA);
/* start the command transfer */
NCRCMD(sc, NCRCMD_TRANS | NCRCMD_DMA);
NCRDMA_GO(sc);
} else {
ncr53c9x_wrfifo(sc, (u_char *)&ecb->cmd.cmd, ecb->clen);
sc->sc_cmdlen = 0;
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_SET_COUNT(sc, size);
/* 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.
*/
{
struct timeval wait, cur;
microuptime(&wait);
wait.tv_usec += 50/sc->sc_freq;
if (wait.tv_usec >= 1000000) {
wait.tv_sec++;
wait.tv_usec -= 1000000;
}
do {
if (NCRDMA_ISINTR(sc))
goto again;
microuptime(&cur);
} while (timercmp(&cur, &wait, <=));
}
goto out;
}
void
ncr53c9x_abort(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
/* 2 secs for the abort */
ecb->xs->timeout = NCR_ABORT_TIMEOUT;
ecb->flags |= ECB_ABORT;
if (ecb == sc->sc_nexus) {
int timeout = ecb->xs->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.
*/
if (timeout > 1000000)
timeout = (timeout / 1000) * hz;
else
timeout = (timeout * hz) / 1000;
timeout_add(&ecb->xs->stimeout, timeout);
} 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(void *arg)
{
struct ncr53c9x_ecb *ecb = arg;
struct scsi_xfer *xs = ecb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct ncr53c9x_softc *sc = sc_link->bus->sb_adapter_softc;
struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target];
int s;
sc_print_addr(sc_link);
printf("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>",
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) {
sc_print_addr(sc_link);
printf("sync negotiation disabled\n");
sc->sc_cfflags |= (1 << (sc_link->target + 16));
}
}
splx(s);
}
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