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freebsd-dev/sys/dev/esp/ncr53c9x.c
Marius Strobl 60df250ae1 - Merge from NetBSD: 
When issuing a non-DMA command, make sure to set the "remaining length of
  command to be transferred via DMA" (sc_cmdlen) to zero up-front, otherwise
  we might get confused on command competition interrupt (no DMA active but
  still data left to transfer).
- Implement handling of MSG_IGN_WIDE_RESIDUE which some targets produce, as
  just rejecting these leads to a resend and disconnect loop.
  Reported and tested by: mjacob

MFC after:	3 days
2012-08-06 08:58:54 +00:00

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/*-
* Copyright (c) 2004 Scott Long
* Copyright (c) 2005, 2008 Marius Strobl <marius@FreeBSD.org>
* 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 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 AUTHOR 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.
*
*/
/* $NetBSD: ncr53c9x.c,v 1.145 2012/06/18 21:23:56 martin Exp $ */
/*-
* Copyright (c) 1998, 2002 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.
*
* 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@FreeBSD.org) and
* Charles Hannum (mycroft@duality.gnu.ai.mit.edu). Thanks a million!
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/callout.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <dev/esp/ncr53c9xreg.h>
#include <dev/esp/ncr53c9xvar.h>
devclass_t esp_devclass;
MODULE_DEPEND(esp, cam, 1, 1, 1);
#ifdef NCR53C9X_DEBUG
int ncr53c9x_debug =
NCR_SHOWMISC /* | NCR_SHOWPHASE | NCR_SHOWTRAC | NCR_SHOWCMDS */;
#endif
static void ncr53c9x_abort(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_action(struct cam_sim *sim, union ccb *ccb);
static void ncr53c9x_async(void *cbarg, uint32_t code,
struct cam_path *path, void *arg);
static void ncr53c9x_callout(void *arg);
static void ncr53c9x_clear(struct ncr53c9x_softc *sc, cam_status result);
static void ncr53c9x_clear_target(struct ncr53c9x_softc *sc, int target,
cam_status result);
static void ncr53c9x_dequeue(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_done(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_free_ecb(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_msgin(struct ncr53c9x_softc *sc);
static void ncr53c9x_msgout(struct ncr53c9x_softc *sc);
static void ncr53c9x_init(struct ncr53c9x_softc *sc, int doreset);
static void ncr53c9x_intr1(struct ncr53c9x_softc *sc);
static void ncr53c9x_poll(struct cam_sim *sim);
static int ncr53c9x_rdfifo(struct ncr53c9x_softc *sc, int how);
static int ncr53c9x_reselect(struct ncr53c9x_softc *sc, int message,
int tagtype, int tagid);
static void ncr53c9x_reset(struct ncr53c9x_softc *sc);
static void ncr53c9x_sense(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_sched(struct ncr53c9x_softc *sc);
static void ncr53c9x_select(struct ncr53c9x_softc *sc,
struct ncr53c9x_ecb *ecb);
static void ncr53c9x_watch(void *arg);
static void ncr53c9x_wrfifo(struct ncr53c9x_softc *sc, uint8_t *p,
int len);
static struct ncr53c9x_ecb *ncr53c9x_get_ecb(struct ncr53c9x_softc *sc);
static struct ncr53c9x_linfo *ncr53c9x_lunsearch(struct ncr53c9x_tinfo *sc,
int64_t lun);
static inline void ncr53c9x_readregs(struct ncr53c9x_softc *sc);
static inline void ncr53c9x_setsync(struct ncr53c9x_softc *sc,
struct ncr53c9x_tinfo *ti);
static inline int ncr53c9x_stp2cpb(struct ncr53c9x_softc *sc,
int period);
#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_features & NCR_F_LARGEXFER) != 0) \
NCR_WRITE_REG((sc), NCR_TCH, (size) >> 16); \
if (sc->sc_rev == NCR_VARIANT_FAS366) \
NCR_WRITE_REG(sc, NCR_RCH, 0); \
} while (/* CONSTCOND */0)
#ifndef mstohz
#define mstohz(ms) \
(((ms) < 0x20000) ? \
((ms +0u) / 1000u) * hz : \
((ms +0u) * hz) /1000u)
#endif
/*
* Names for the NCR53c9x variants, corresponding to the variant tags
* in ncr53c9xvar.h.
*/
static const char *ncr53c9x_variant_names[] = {
"ESP100",
"ESP100A",
"ESP200",
"NCR53C94",
"NCR53C96",
"ESP406",
"FAS408",
"FAS216",
"AM53C974",
"FAS366/HME",
"NCR53C90 (86C01)",
"FAS100A",
"FAS236",
};
/*
* 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.
*/
int
ncr53c9x_attach(struct ncr53c9x_softc *sc)
{
struct cam_devq *devq;
struct cam_sim *sim;
struct cam_path *path;
struct ncr53c9x_ecb *ecb;
int error, i;
if (NCR_LOCK_INITIALIZED(sc) == 0) {
device_printf(sc->sc_dev, "mutex not initialized\n");
return (ENXIO);
}
callout_init_mtx(&sc->sc_watchdog, &sc->sc_lock, 0);
/*
* Note, the front-end has set us up to print the chip variation.
*/
if (sc->sc_rev >= NCR_VARIANT_MAX) {
device_printf(sc->sc_dev, "unknown variant %d, devices not "
"attached\n", sc->sc_rev);
return (EINVAL);
}
device_printf(sc->sc_dev, "%s, %d MHz, SCSI ID %d\n",
ncr53c9x_variant_names[sc->sc_rev], sc->sc_freq, sc->sc_id);
sc->sc_ntarg = (sc->sc_rev == NCR_VARIANT_FAS366) ? 16 : 8;
/*
* 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_self = 1;
sc->sc_omess = malloc(NCR_MAX_MSG_LEN, M_DEVBUF, M_NOWAIT);
if (sc->sc_omess == NULL) {
device_printf(sc->sc_dev,
"cannot allocate MSGOUT buffer\n");
return (ENOMEM);
}
} else
sc->sc_omess_self = 0;
if (sc->sc_imess == NULL) {
sc->sc_imess_self = 1;
sc->sc_imess = malloc(NCR_MAX_MSG_LEN + 1, M_DEVBUF, M_NOWAIT);
if (sc->sc_imess == NULL) {
device_printf(sc->sc_dev,
"cannot allocate MSGIN buffer\n");
error = ENOMEM;
goto fail_omess;
}
} else
sc->sc_imess_self = 0;
sc->sc_tinfo = malloc(sc->sc_ntarg * sizeof(sc->sc_tinfo[0]),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (sc->sc_tinfo == NULL) {
device_printf(sc->sc_dev,
"cannot allocate target info buffer\n");
error = ENOMEM;
goto fail_imess;
}
/*
* Treat NCR53C90 with the 86C01 DMA chip exactly as ESP100
* from now on.
*/
if (sc->sc_rev == NCR_VARIANT_NCR53C90_86C01)
sc->sc_rev = NCR_VARIANT_ESP100;
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);
/* The CCF register only has 3 bits; 0 is actually 8. */
sc->sc_ccf &= 7;
/*
* Register with CAM.
*/
devq = cam_simq_alloc(sc->sc_ntarg);
if (devq == NULL) {
device_printf(sc->sc_dev, "cannot allocate device queue\n");
error = ENOMEM;
goto fail_tinfo;
}
sim = cam_sim_alloc(ncr53c9x_action, ncr53c9x_poll, "esp", sc,
device_get_unit(sc->sc_dev), &sc->sc_lock, 1, NCR_TAG_DEPTH, devq);
if (sim == NULL) {
device_printf(sc->sc_dev, "cannot allocate SIM entry\n");
error = ENOMEM;
goto fail_devq;
}
NCR_LOCK(sc);
if (xpt_bus_register(sim, sc->sc_dev, 0) != CAM_SUCCESS) {
device_printf(sc->sc_dev, "cannot register bus\n");
error = EIO;
goto fail_lock;
}
if (xpt_create_path(&path, NULL, cam_sim_path(sim),
CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
device_printf(sc->sc_dev, "cannot create path\n");
error = EIO;
goto fail_bus;
}
if (xpt_register_async(AC_LOST_DEVICE, ncr53c9x_async, sim, path) !=
CAM_REQ_CMP) {
device_printf(sc->sc_dev, "cannot register async handler\n");
error = EIO;
goto fail_path;
}
sc->sc_sim = sim;
sc->sc_path = path;
/* Reset state and bus. */
#if 0
sc->sc_cfflags = sc->sc_dev.dv_cfdata->cf_flags;
#else
sc->sc_cfflags = 0;
#endif
sc->sc_state = 0;
ncr53c9x_init(sc, 1);
TAILQ_INIT(&sc->free_list);
if ((sc->ecb_array =
malloc(sizeof(struct ncr53c9x_ecb) * NCR_TAG_DEPTH, M_DEVBUF,
M_NOWAIT | M_ZERO)) == NULL) {
device_printf(sc->sc_dev, "cannot allocate ECB array\n");
error = ENOMEM;
goto fail_async;
}
for (i = 0; i < NCR_TAG_DEPTH; i++) {
ecb = &sc->ecb_array[i];
ecb->sc = sc;
ecb->tag_id = i;
callout_init_mtx(&ecb->ch, &sc->sc_lock, 0);
TAILQ_INSERT_HEAD(&sc->free_list, ecb, free_links);
}
callout_reset(&sc->sc_watchdog, 60 * hz, ncr53c9x_watch, sc);
NCR_UNLOCK(sc);
return (0);
fail_async:
xpt_register_async(0, ncr53c9x_async, sim, path);
fail_path:
xpt_free_path(path);
fail_bus:
xpt_bus_deregister(cam_sim_path(sim));
fail_lock:
NCR_UNLOCK(sc);
cam_sim_free(sim, TRUE);
fail_devq:
cam_simq_free(devq);
fail_tinfo:
free(sc->sc_tinfo, M_DEVBUF);
fail_imess:
if (sc->sc_imess_self)
free(sc->sc_imess, M_DEVBUF);
fail_omess:
if (sc->sc_omess_self)
free(sc->sc_omess, M_DEVBUF);
return (error);
}
int
ncr53c9x_detach(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_linfo *li, *nextli;
int t;
callout_drain(&sc->sc_watchdog);
NCR_LOCK(sc);
if (sc->sc_tinfo) {
/* Cancel all commands. */
ncr53c9x_clear(sc, CAM_REQ_ABORTED);
/* Free logical units. */
for (t = 0; t < sc->sc_ntarg; t++) {
for (li = LIST_FIRST(&sc->sc_tinfo[t].luns); li;
li = nextli) {
nextli = LIST_NEXT(li, link);
free(li, M_DEVBUF);
}
}
}
xpt_register_async(0, ncr53c9x_async, sc->sc_sim, sc->sc_path);
xpt_free_path(sc->sc_path);
xpt_bus_deregister(cam_sim_path(sc->sc_sim));
cam_sim_free(sc->sc_sim, TRUE);
NCR_UNLOCK(sc);
free(sc->ecb_array, M_DEVBUF);
free(sc->sc_tinfo, M_DEVBUF);
if (sc->sc_imess_self)
free(sc->sc_imess, M_DEVBUF);
if (sc->sc_omess_self)
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.
*/
static void
ncr53c9x_reset(struct ncr53c9x_softc *sc)
{
NCR_LOCK_ASSERT(sc, MA_OWNED);
/* 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);
/* FALLTHROUGH */
case NCR_VARIANT_AM53C974:
case NCR_VARIANT_FAS100A:
case NCR_VARIANT_FAS216:
case NCR_VARIANT_FAS236:
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);
/* FALLTHROUGH */
case NCR_VARIANT_ESP100A:
sc->sc_features |= NCR_F_SELATN3;
if ((sc->sc_cfg2 & NCRCFG2_FE) != 0)
sc->sc_features |= NCR_F_LARGEXFER;
NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2);
/* FALLTHROUGH */
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_HASCFG3 | NCR_F_FASTSCSI |
NCR_F_SELATN3 | NCR_F_LARGEXFER;
sc->sc_cfg3 = NCRFASCFG3_FASTCLK | NCRFASCFG3_OBAUTO;
if (sc->sc_id > 7)
sc->sc_cfg3 |= NCRFASCFG3_IDBIT3;
sc->sc_cfg3_fscsi = NCRFASCFG3_FASTSCSI;
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
sc->sc_cfg2 = 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:
device_printf(sc->sc_dev,
"unknown revision code, assuming ESP100\n");
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
device_printf(sc->sc_dev, "%s: revision %d\n", __func__, sc->sc_rev);
device_printf(sc->sc_dev, "%s: cfg1 0x%x, cfg2 0x%x, cfg3 0x%x, ccf "
"0x%x, timeout 0x%x\n", __func__, sc->sc_cfg1, sc->sc_cfg2,
sc->sc_cfg3, sc->sc_ccf, sc->sc_timeout);
#endif
}
/*
* Clear all commands.
*/
static void
ncr53c9x_clear(struct ncr53c9x_softc *sc, cam_status result)
{
struct ncr53c9x_ecb *ecb;
int r;
NCR_LOCK_ASSERT(sc, MA_OWNED);
/* Cancel any active commands. */
sc->sc_state = NCR_CLEANING;
sc->sc_msgify = 0;
ecb = sc->sc_nexus;
if (ecb != NULL) {
ecb->ccb->ccb_h.status = result;
ncr53c9x_done(sc, ecb);
}
/* Cancel outstanding disconnected commands. */
for (r = 0; r < sc->sc_ntarg; r++)
ncr53c9x_clear_target(sc, r, result);
}
/*
* Clear all commands for a specific target.
*/
static void
ncr53c9x_clear_target(struct ncr53c9x_softc *sc, int target,
cam_status result)
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
int i;
NCR_LOCK_ASSERT(sc, MA_OWNED);
/* Cancel outstanding disconnected commands on each LUN. */
LIST_FOREACH(li, &sc->sc_tinfo[target].luns, link) {
ecb = li->untagged;
if (ecb != NULL) {
li->untagged = NULL;
/*
* XXX should we terminate a command
* that never reached the disk?
*/
li->busy = 0;
ecb->ccb->ccb_h.status = result;
ncr53c9x_done(sc, ecb);
}
for (i = 0; i < NCR_TAG_DEPTH; i++) {
ecb = li->queued[i];
if (ecb != NULL) {
li->queued[i] = NULL;
ecb->ccb->ccb_h.status = result;
ncr53c9x_done(sc, ecb);
}
}
li->used = 0;
}
}
/*
* Initialize ncr53c9x state machine.
*/
static void
ncr53c9x_init(struct ncr53c9x_softc *sc, int doreset)
{
struct ncr53c9x_tinfo *ti;
int r;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_MISC(("[NCR_INIT(%d) %d] ", doreset, sc->sc_state));
if (sc->sc_state == 0) {
/* First time through; initialize. */
TAILQ_INIT(&sc->ready_list);
sc->sc_nexus = NULL;
memset(sc->sc_tinfo, 0, sizeof(*sc->sc_tinfo));
for (r = 0; r < sc->sc_ntarg; r++) {
LIST_INIT(&sc->sc_tinfo[r].luns);
}
} else
ncr53c9x_clear(sc, CAM_CMD_TIMEOUT);
/*
* Reset the chip to a known state.
*/
ncr53c9x_reset(sc);
sc->sc_flags = 0;
sc->sc_msgpriq = sc->sc_msgout = sc->sc_msgoutq = 0;
sc->sc_phase = sc->sc_prevphase = INVALID_PHASE;
/*
* If we're the first time through, set the default parameters
* for all targets. Otherwise we only clear their current transfer
* settings so we'll renegotiate their goal settings with the next
* command.
*/
if (sc->sc_state == 0) {
for (r = 0; r < sc->sc_ntarg; r++) {
ti = &sc->sc_tinfo[r];
/* XXX - config flags per target: low bits: no reselect; high bits: no synch */
ti->flags = ((sc->sc_minsync != 0 &&
(sc->sc_cfflags & (1 << ((r & 7) + 8))) == 0) ?
0 : T_SYNCHOFF) |
((sc->sc_cfflags & (1 << (r & 7))) == 0 ?
0 : T_RSELECTOFF);
ti->curr.period = ti->goal.period = 0;
ti->curr.offset = ti->goal.offset = 0;
ti->curr.width = ti->goal.width =
MSG_EXT_WDTR_BUS_8_BIT;
}
} else {
for (r = 0; r < sc->sc_ntarg; r++) {
ti = &sc->sc_tinfo[r];
ti->flags &= ~(T_SDTRSENT | T_WDTRSENT);
ti->curr.period = 0;
ti->curr.offset = 0;
ti->curr.width = MSG_EXT_WDTR_BUS_8_BIT;
}
}
if (doreset) {
sc->sc_state = NCR_SBR;
NCRCMD(sc, NCRCMD_RSTSCSI);
/* Give the bus a fighting chance to settle. */
DELAY(250000);
} 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 the DMA CSR has an interrupt showing. Call only
* if an interrupt is pending.
*/
static inline void
ncr53c9x_readregs(struct ncr53c9x_softc *sc)
{
NCR_LOCK_ASSERT(sc, MA_OWNED);
sc->sc_espstat = NCR_READ_REG(sc, NCR_STAT);
/* Only the step 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);
/*
* 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) ?
BUSFREE_PHASE : sc->sc_espstat & NCRSTAT_PHASE;
NCR_INTS(("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;
NCR_LOCK_ASSERT(sc, MA_OWNED);
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)
{
uint8_t cfg3, syncoff, synctp;
NCR_LOCK_ASSERT(sc, MA_OWNED);
cfg3 = sc->sc_cfg3;
if (ti->curr.offset != 0) {
syncoff = ti->curr.offset;
synctp = ncr53c9x_stp2cpb(sc, ti->curr.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->curr.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 (ti->curr.width != MSG_EXT_WDTR_BUS_8_BIT) {
if (sc->sc_rev == NCR_VARIANT_FAS366)
cfg3 |= NCRFASCFG3_EWIDE;
}
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.
*/
static void
ncr53c9x_select(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct ncr53c9x_tinfo *ti;
uint8_t *cmd;
size_t dmasize;
int clen, error, selatn3, selatns;
int lun = ecb->ccb->ccb_h.target_lun;
int target = ecb->ccb->ccb_h.target_id;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s(t%d,l%d,cmd:%x,tag:%x,%x)] ", __func__, target, lun,
ecb->cmd.cmd.opcode, ecb->tag[0], ecb->tag[1]));
ti = &sc->sc_tinfo[target];
sc->sc_state = NCR_SELECTING;
/*
* Schedule the callout 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.
*/
callout_reset(&ecb->ch, mstohz(ecb->timeout), ncr53c9x_callout, ecb);
/*
* 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_HMEXC32 |
NCR_BUSID_HMEENCID);
} else
NCR_WRITE_REG(sc, NCR_SELID, target);
/*
* If we are requesting sense, force a renegotiation if we are
* currently using anything different from asynchronous at 8 bit
* as the target might have lost our transfer negotiations.
*/
if ((ecb->flags & ECB_SENSE) != 0 && (ti->curr.offset != 0 ||
ti->curr.width != MSG_EXT_WDTR_BUS_8_BIT)) {
ti->curr.period = 0;
ti->curr.offset = 0;
ti->curr.width = MSG_EXT_WDTR_BUS_8_BIT;
}
ncr53c9x_setsync(sc, ti);
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->curr.period != ti->goal.period ||
ti->curr.offset != ti->goal.offset ||
ti->curr.width != ti->goal.width) {
/* We have to use SELATNS to send sync/wide messages. */
selatn3 = 0;
selatns = 1;
}
cmd = (uint8_t *)&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, (ti->flags & 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;
error = NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0,
&dmasize);
if (error != 0)
goto cmd;
/* Program the SCSI counter. */
NCR_SET_COUNT(sc, dmasize);
/* Load the count in. */
NCRCMD(sc, NCRCMD_NOP | NCRCMD_DMA);
/* And get the target's 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;
}
cmd:
/*
* 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 target's attention. */
if (selatns) {
NCR_MSGS(("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);
}
static void
ncr53c9x_free_ecb(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
NCR_LOCK_ASSERT(sc, MA_OWNED);
ecb->flags = 0;
TAILQ_INSERT_TAIL(&sc->free_list, ecb, free_links);
}
static struct ncr53c9x_ecb *
ncr53c9x_get_ecb(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_ecb *ecb;
NCR_LOCK_ASSERT(sc, MA_OWNED);
ecb = TAILQ_FIRST(&sc->free_list);
if (ecb) {
if (ecb->flags != 0)
panic("%s: ecb flags not cleared", __func__);
TAILQ_REMOVE(&sc->free_list, ecb, free_links);
ecb->flags = ECB_ALLOC;
bzero(&ecb->ccb, sizeof(struct ncr53c9x_ecb) -
offsetof(struct ncr53c9x_ecb, ccb));
}
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.
*/
static void
ncr53c9x_action(struct cam_sim *sim, union ccb *ccb)
{
struct ccb_pathinq *cpi;
struct ccb_scsiio *csio;
struct ccb_trans_settings *cts;
struct ccb_trans_settings_scsi *scsi;
struct ccb_trans_settings_spi *spi;
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_softc *sc;
struct ncr53c9x_tinfo *ti;
int target;
sc = cam_sim_softc(sim);
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s %d]", __func__, ccb->ccb_h.func_code));
switch (ccb->ccb_h.func_code) {
case XPT_RESET_BUS:
ncr53c9x_init(sc, 1);
ccb->ccb_h.status = CAM_REQ_CMP;
break;
case XPT_CALC_GEOMETRY:
cam_calc_geometry(&ccb->ccg, sc->sc_extended_geom);
break;
case XPT_PATH_INQ:
cpi = &ccb->cpi;
cpi->version_num = 1;
cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE;
cpi->hba_inquiry |=
(sc->sc_rev == NCR_VARIANT_FAS366) ? PI_WIDE_16 : 0;
cpi->target_sprt = 0;
cpi->hba_misc = 0;
cpi->hba_eng_cnt = 0;
cpi->max_target = sc->sc_ntarg - 1;
cpi->max_lun = 7;
cpi->initiator_id = sc->sc_id;
strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
strncpy(cpi->hba_vid, "NCR", HBA_IDLEN);
strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
cpi->unit_number = cam_sim_unit(sim);
cpi->bus_id = 0;
cpi->base_transfer_speed = 3300;
cpi->protocol = PROTO_SCSI;
cpi->protocol_version = SCSI_REV_2;
cpi->transport = XPORT_SPI;
cpi->transport_version = 2;
cpi->maxio = sc->sc_maxxfer;
ccb->ccb_h.status = CAM_REQ_CMP;
break;
case XPT_GET_TRAN_SETTINGS:
cts = &ccb->cts;
ti = &sc->sc_tinfo[ccb->ccb_h.target_id];
scsi = &cts->proto_specific.scsi;
spi = &cts->xport_specific.spi;
cts->protocol = PROTO_SCSI;
cts->protocol_version = SCSI_REV_2;
cts->transport = XPORT_SPI;
cts->transport_version = 2;
if (cts->type == CTS_TYPE_CURRENT_SETTINGS) {
spi->sync_period = ti->curr.period;
spi->sync_offset = ti->curr.offset;
spi->bus_width = ti->curr.width;
if ((ti->flags & T_TAG) != 0) {
spi->flags |= CTS_SPI_FLAGS_DISC_ENB;
scsi->flags |= CTS_SCSI_FLAGS_TAG_ENB;
} else {
spi->flags &= ~CTS_SPI_FLAGS_DISC_ENB;
scsi->flags &= ~CTS_SCSI_FLAGS_TAG_ENB;
}
} else {
if ((ti->flags & T_SYNCHOFF) != 0) {
spi->sync_period = 0;
spi->sync_offset = 0;
} else {
spi->sync_period = sc->sc_minsync;
spi->sync_offset = sc->sc_maxoffset;
}
spi->bus_width = sc->sc_maxwidth;
spi->flags |= CTS_SPI_FLAGS_DISC_ENB;
scsi->flags |= CTS_SCSI_FLAGS_TAG_ENB;
}
spi->valid =
CTS_SPI_VALID_BUS_WIDTH |
CTS_SPI_VALID_SYNC_RATE |
CTS_SPI_VALID_SYNC_OFFSET |
CTS_SPI_VALID_DISC;
scsi->valid = CTS_SCSI_VALID_TQ;
ccb->ccb_h.status = CAM_REQ_CMP;
break;
case XPT_ABORT:
device_printf(sc->sc_dev, "XPT_ABORT called\n");
ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
break;
case XPT_TERM_IO:
device_printf(sc->sc_dev, "XPT_TERM_IO called\n");
ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
break;
case XPT_RESET_DEV:
case XPT_SCSI_IO:
if (ccb->ccb_h.target_id < 0 ||
ccb->ccb_h.target_id >= sc->sc_ntarg) {
ccb->ccb_h.status = CAM_PATH_INVALID;
goto done;
}
/* Get an ECB to use. */
ecb = ncr53c9x_get_ecb(sc);
/*
* This should never happen as we track resources
* in the mid-layer.
*/
if (ecb == NULL) {
xpt_freeze_simq(sim, 1);
ccb->ccb_h.status = CAM_REQUEUE_REQ;
device_printf(sc->sc_dev, "unable to allocate ecb\n");
goto done;
}
/* Initialize ecb. */
ecb->ccb = ccb;
ecb->timeout = ccb->ccb_h.timeout;
if (ccb->ccb_h.func_code == XPT_RESET_DEV) {
ecb->flags |= ECB_RESET;
ecb->clen = 0;
ecb->dleft = 0;
} else {
csio = &ccb->csio;
if ((ccb->ccb_h.flags & CAM_CDB_POINTER) != 0)
bcopy(csio->cdb_io.cdb_ptr, &ecb->cmd.cmd,
csio->cdb_len);
else
bcopy(csio->cdb_io.cdb_bytes, &ecb->cmd.cmd,
csio->cdb_len);
ecb->clen = csio->cdb_len;
ecb->daddr = csio->data_ptr;
ecb->dleft = csio->dxfer_len;
}
ecb->stat = 0;
TAILQ_INSERT_TAIL(&sc->ready_list, ecb, chain);
ecb->flags |= ECB_READY;
if (sc->sc_state == NCR_IDLE)
ncr53c9x_sched(sc);
return;
case XPT_SET_TRAN_SETTINGS:
cts = &ccb->cts;
target = ccb->ccb_h.target_id;
ti = &sc->sc_tinfo[target];
scsi = &cts->proto_specific.scsi;
spi = &cts->xport_specific.spi;
if ((scsi->valid & CTS_SCSI_VALID_TQ) != 0) {
if ((sc->sc_cfflags & (1<<((target & 7) + 16))) == 0 &&
(scsi->flags & CTS_SCSI_FLAGS_TAG_ENB)) {
NCR_MISC(("%s: target %d: tagged queuing\n",
device_get_nameunit(sc->sc_dev), target));
ti->flags |= T_TAG;
} else
ti->flags &= ~T_TAG;
}
if ((spi->valid & CTS_SPI_VALID_BUS_WIDTH) != 0) {
NCR_MISC(("%s: target %d: wide negotiation\n",
device_get_nameunit(sc->sc_dev), target));
ti->goal.width = spi->bus_width;
}
if ((spi->valid & CTS_SPI_VALID_SYNC_RATE) != 0) {
NCR_MISC(("%s: target %d: sync period negotiation\n",
device_get_nameunit(sc->sc_dev), target));
ti->goal.period = spi->sync_period;
}
if ((spi->valid & CTS_SPI_VALID_SYNC_OFFSET) != 0) {
NCR_MISC(("%s: target %d: sync offset negotiation\n",
device_get_nameunit(sc->sc_dev), target));
ti->goal.offset = spi->sync_offset;
}
ccb->ccb_h.status = CAM_REQ_CMP;
break;
default:
device_printf(sc->sc_dev, "Unhandled function code %d\n",
ccb->ccb_h.func_code);
ccb->ccb_h.status = CAM_PROVIDE_FAIL;
}
done:
xpt_done(ccb);
}
/*
* Used when interrupt driven I/O is not allowed, e.g. during boot.
*/
static void
ncr53c9x_poll(struct cam_sim *sim)
{
struct ncr53c9x_softc *sc;
sc = cam_sim_softc(sim);
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s] ", __func__));
if (NCRDMA_ISINTR(sc))
ncr53c9x_intr1(sc);
}
/*
* Asynchronous notification handler
*/
static void
ncr53c9x_async(void *cbarg, uint32_t code, struct cam_path *path, void *arg)
{
struct ncr53c9x_softc *sc;
struct ncr53c9x_tinfo *ti;
int target;
sc = cam_sim_softc(cbarg);
NCR_LOCK_ASSERT(sc, MA_OWNED);
switch (code) {
case AC_LOST_DEVICE:
target = xpt_path_target_id(path);
if (target < 0 || target >= sc->sc_ntarg)
break;
/* Cancel outstanding disconnected commands. */
ncr53c9x_clear_target(sc, target, CAM_REQ_ABORTED);
/* Set the default parameters for the target. */
ti = &sc->sc_tinfo[target];
/* XXX - config flags per target: low bits: no reselect; high bits: no synch */
ti->flags = ((sc->sc_minsync != 0 &&
(sc->sc_cfflags & (1 << ((target & 7) + 8))) == 0) ?
0 : T_SYNCHOFF) |
((sc->sc_cfflags & (1 << (target & 7))) == 0 ?
0 : T_RSELECTOFF);
ti->curr.period = ti->goal.period = 0;
ti->curr.offset = ti->goal.offset = 0;
ti->curr.width = ti->goal.width = MSG_EXT_WDTR_BUS_8_BIT;
break;
}
}
/*
* 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_action and ncr53c9x_done.
* This may save us an unnecessary interrupt just to get things going.
* Should only be called when state == NCR_IDLE and with sc_lock held.
*/
static void
ncr53c9x_sched(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
int lun, tag;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s] ", __func__));
if (sc->sc_state != NCR_IDLE)
panic("%s: not IDLE (state=%d)", __func__, 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) {
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
lun = ecb->ccb->ccb_h.target_lun;
/* Select type of tag for this command */
if ((ti->flags & (T_RSELECTOFF | T_TAG)) != T_TAG)
tag = 0;
else if ((ecb->flags & ECB_SENSE) != 0)
tag = 0;
else if ((ecb->ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) == 0)
tag = 0;
else if (ecb->ccb->csio.tag_action == CAM_TAG_ACTION_NONE)
tag = 0;
else
tag = ecb->ccb->csio.tag_action;
li = TINFO_LUN(ti, lun);
if (li == NULL) {
/* Initialize LUN info and add to list. */
li = malloc(sizeof(*li), M_DEVBUF, M_NOWAIT | M_ZERO);
if (li == NULL)
continue;
li->lun = lun;
LIST_INSERT_HEAD(&ti->luns, li, link);
if (lun < NCR_NLUN)
ti->lun[lun] = li;
}
li->last_used = time_second;
if (tag == 0) {
/* Try to issue this as an untagged 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;
} else {
/* not ready, yet */
continue;
}
}
ecb->tag[0] = tag;
if (tag != 0) {
li->queued[ecb->tag_id] = ecb;
ecb->tag[1] = ecb->tag_id;
li->used++;
}
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_TRACE(("[%s %d:%d busy] \n", __func__,
ecb->ccb->ccb_h.target_id,
ecb->ccb->ccb_h.target_lun));
}
}
static void
ncr53c9x_sense(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
union ccb *ccb = ecb->ccb;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
struct scsi_request_sense *ss = (void *)&ecb->cmd.cmd;
int lun;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s] ", __func__));
lun = ccb->ccb_h.target_lun;
ti = &sc->sc_tinfo[ccb->ccb_h.target_id];
/* Next, setup a REQUEST SENSE command block. */
memset(ss, 0, sizeof(*ss));
ss->opcode = REQUEST_SENSE;
ss->byte2 = ccb->ccb_h.target_lun << SCSI_CMD_LUN_SHIFT;
ss->length = sizeof(struct scsi_sense_data);
ecb->clen = sizeof(*ss);
memset(&ccb->csio.sense_data, 0, sizeof(ccb->csio.sense_data));
ecb->daddr = (uint8_t *)&ccb->csio.sense_data;
ecb->dleft = sizeof(struct scsi_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)
*/
static void
ncr53c9x_done(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
union ccb *ccb = ecb->ccb;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
int lun, sense_returned;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s(status:%x)] ", __func__, ccb->ccb_h.status));
ti = &sc->sc_tinfo[ccb->ccb_h.target_id];
lun = ccb->ccb_h.target_lun;
li = TINFO_LUN(ti, lun);
callout_stop(&ecb->ch);
/*
* Now, if we've come here with no error code, i.e. we've kept the
* initial CAM_REQ_CMP, 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 (ccb->ccb_h.status == CAM_REQ_CMP) {
ccb->csio.scsi_status = ecb->stat;
if ((ecb->flags & ECB_ABORT) != 0)
ccb->ccb_h.status = CAM_CMD_TIMEOUT;
else if ((ecb->flags & ECB_SENSE) != 0 &&
(ecb->stat != SCSI_STATUS_CHECK_COND)) {
ccb->csio.scsi_status = SCSI_STATUS_CHECK_COND;
ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR |
CAM_AUTOSNS_VALID;
sense_returned = sizeof(ccb->csio.sense_data) -
ecb->dleft;
if (sense_returned < ccb->csio.sense_len)
ccb->csio.sense_resid = ccb->csio.sense_len -
sense_returned;
else
ccb->csio.sense_resid = 0;
} else if (ecb->stat == SCSI_STATUS_CHECK_COND) {
if ((ecb->flags & ECB_SENSE) != 0)
ccb->ccb_h.status = CAM_AUTOSENSE_FAIL;
else {
/* First, save the return values. */
ccb->csio.resid = ecb->dleft;
if ((ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) ==
0) {
ncr53c9x_sense(sc, ecb);
return;
}
ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR;
}
} else
ccb->csio.resid = ecb->dleft;
if (ecb->stat == SCSI_STATUS_QUEUE_FULL)
ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR;
else if (ecb->stat == SCSI_STATUS_BUSY)
ccb->ccb_h.status = CAM_SCSI_BUSY;
} else if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
ccb->ccb_h.status |= CAM_DEV_QFRZN;
xpt_freeze_devq(ccb->ccb_h.path, 1);
}
#ifdef NCR53C9X_DEBUG
if ((ncr53c9x_debug & NCR_SHOWTRAC) != 0) {
if (ccb->csio.resid != 0)
printf("resid=%d ", ccb->csio.resid);
if ((ccb->ccb_h.status & CAM_AUTOSNS_VALID) != 0)
printf("sense=0x%02x\n",
ccb->csio.sense_data.error_code);
else
printf("status SCSI=0x%x CAM=0x%x\n",
ccb->csio.scsi_status, ccb->ccb_h.status);
}
#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 ((ccb->ccb_h.status & CAM_SEL_TIMEOUT) != 0) {
/* 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);
ti->cmds++;
xpt_done(ccb);
}
static void
ncr53c9x_dequeue(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
int64_t lun;
NCR_LOCK_ASSERT(sc, MA_OWNED);
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
lun = ecb->ccb->ccb_h.target_lun;
li = TINFO_LUN(ti, lun);
#ifdef DIAGNOSTIC
if (li == NULL || li->lun != lun)
panic("%s: lun %llx for ecb %p does not exist", __func__,
(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("%s: slot %d for lun %llx has %p instead of ecb "
"%p", __func__, ecb->tag[1], (long long)lun,
li->queued[ecb->tag[1]], ecb);
#endif
li->queued[ecb->tag[1]] = NULL;
li->used--;
}
ecb->tag[0] = ecb->tag[1] = 0;
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_MSGS(("ncr53c9x_sched_msgout %x %d", m, __LINE__)); \
NCRCMD(sc, NCRCMD_SETATN); \
sc->sc_flags |= NCR_ATN; \
sc->sc_msgpriq |= (m); \
} while (/* CONSTCOND */0)
static void
ncr53c9x_flushfifo(struct ncr53c9x_softc *sc)
{
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s] ", __func__));
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;
uint8_t *ibuf;
NCR_LOCK_ASSERT(sc, MA_OWNED);
switch (how) {
case NCR_RDFIFO_START:
ibuf = sc->sc_imess;
sc->sc_imlen = 0;
break;
case NCR_RDFIFO_CONTINUE:
ibuf = sc->sc_imess + sc->sc_imlen;
break;
default:
panic("%s: bad flag", __func__);
/* NOTREACHED */
}
/*
* 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++)
ibuf[i] = NCR_READ_REG(sc, NCR_FIFO);
if (sc->sc_espstat2 & NCRFAS_STAT2_ISHUTTLE) {
NCR_WRITE_REG(sc, NCR_FIFO, 0);
ibuf[i++] = NCR_READ_REG(sc, NCR_FIFO);
NCR_READ_REG(sc, NCR_FIFO);
ncr53c9x_flushfifo(sc);
}
} else
for (i = 0; i < n; i++)
ibuf[i] = NCR_READ_REG(sc, NCR_FIFO);
sc->sc_imlen += i;
#if 0
#ifdef NCR53C9X_DEBUG
NCR_TRACE(("\n[rdfifo %s (%d):",
(how == NCR_RDFIFO_START) ? "start" : "cont", (int)sc->sc_imlen));
if ((ncr53c9x_debug & NCR_SHOWTRAC) != 0) {
for (i = 0; i < sc->sc_imlen; i++)
printf(" %02x", sc->sc_imess[i]);
printf("]\n");
}
#endif
#endif
return (sc->sc_imlen);
}
static void
ncr53c9x_wrfifo(struct ncr53c9x_softc *sc, uint8_t *p, int len)
{
int i;
NCR_LOCK_ASSERT(sc, MA_OWNED);
#ifdef NCR53C9X_DEBUG
NCR_MSGS(("[wrfifo(%d):", len));
if ((ncr53c9x_debug & NCR_SHOWMSGS) != 0) {
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);
}
}
static int
ncr53c9x_reselect(struct ncr53c9x_softc *sc, int message, int tagtype,
int tagid)
{
struct ncr53c9x_ecb *ecb = NULL;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
uint8_t lun, selid, target;
NCR_LOCK_ASSERT(sc, MA_OWNED);
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)) {
device_printf(sc->sc_dev, "reselect with invalid "
"selid %02x; sending DEVICE RESET\n", selid);
goto reset;
}
target = ffs(selid) - 1;
}
lun = message & 0x07;
/*
* Search wait queue for disconnected command.
* 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
* untagged 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) {
device_printf(sc->sc_dev, "reselect from target %d lun %d "
"tag %x:%x with no nexus; sending ABORT\n",
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);
}
/* From NetBSD; these should go into CAM at some point. */
#define MSG_ISEXTENDED(m) ((m) == MSG_EXTENDED)
#define MSG_IS1BYTE(m) \
((!MSG_ISEXTENDED(m) && (m) < 0x20) || MSG_ISIDENTIFY(m))
#define MSG_IS2BYTE(m) (((m) & 0xf0) == 0x20)
static inline int
__verify_msg_format(uint8_t *p, int len)
{
if (len == 1 && MSG_IS1BYTE(p[0]))
return (1);
if (len == 2 && MSG_IS2BYTE(p[0]))
return (1);
if (len >= 3 && MSG_ISEXTENDED(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.
*/
static void
ncr53c9x_msgin(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
uint8_t *pb;
int len, lun;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s(curmsglen:%ld)] ", __func__, (long)sc->sc_imlen));
if (sc->sc_imlen == 0) {
device_printf(sc->sc_dev, "msgin: no msg byte available\n");
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) {
device_printf(sc->sc_dev, "phase change, dropping message, "
"prev %d, state %d\n", sc->sc_prevphase, sc->sc_state);
sc->sc_flags &= ~NCR_DROP_MSGI;
sc->sc_imlen = 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) != 0) {
NCRCMD(sc, NCRCMD_MSGOK);
device_printf(sc->sc_dev, "<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 {
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;
len = sc->sc_imlen - 1;
break;
default:
pb = sc->sc_imess;
len = sc->sc_imlen;
}
if (__verify_msg_format(pb, len))
goto gotit;
}
/* Acknowledge 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 a 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) {
case NCR_CONNECTED:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
switch (sc->sc_imess[0]) {
case MSG_CMDCOMPLETE:
NCR_MSGS(("cmdcomplete "));
if (sc->sc_dleft < 0) {
xpt_print_path(ecb->ccb->ccb_h.path);
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->ccb->csio.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.
*/
device_printf(sc->sc_dev, "tagged queuing "
"rejected: target %d\n",
ecb->ccb->ccb_h.target_id);
NCR_MSGS(("(rejected sent tag)"));
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
ti->flags &= ~T_TAG;
lun = ecb->ccb->ccb_h.target_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:
device_printf(sc->sc_dev, "sync transfer "
"rejected: target %d\n",
ecb->ccb->ccb_h.target_id);
ti->flags &= ~T_SDTRSENT;
ti->curr.period = ti->goal.period = 0;
ti->curr.offset = ti->goal.offset = 0;
ncr53c9x_setsync(sc, ti);
break;
case SEND_WDTR:
device_printf(sc->sc_dev, "wide transfer "
"rejected: target %d\n",
ecb->ccb->ccb_h.target_id);
ti->flags &= ~T_WDTRSENT;
ti->curr.width = ti->goal.width =
MSG_EXT_WDTR_BUS_8_BIT;
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_IGN_WIDE_RESIDUE:
NCR_MSGS(("ignore wide residue (%d bytes)",
sc->sc_imess[1]));
if (sc->sc_imess[1] != 1) {
xpt_print_path(ecb->ccb->ccb_h.path);
printf("unexpected MESSAGE IGNORE WIDE "
"RESIDUE (%d bytes); sending REJECT\n",
sc->sc_imess[1]);
goto reject;
}
/*
* If there was a last transfer of an even number of
* bytes, wipe the "done" memory and adjust by one
* byte (sc->sc_imess[1]).
*/
len = sc->sc_dleft - ecb->dleft;
if (len != 0 && (len & 1) == 0) {
ecb->flags &= ~ECB_TENTATIVE_DONE;
sc->sc_dp = (char *)sc->sc_dp - 1;
sc->sc_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->curr.period = sc->sc_imess[3];
ti->curr.offset = sc->sc_imess[4];
if (sc->sc_minsync == 0 ||
ti->curr.offset == 0 ||
ti->curr.period > 124) {
#if 0
#ifdef NCR53C9X_DEBUG
xpt_print_path(ecb->ccb->ccb_h.path);
printf("async mode\n");
#endif
#endif
if ((ti->flags & T_SDTRSENT) == 0) {
/*
* target initiated negotiation
*/
ti->curr.offset = 0;
ncr53c9x_sched_msgout(
SEND_SDTR);
}
} else {
ti->curr.period =
ncr53c9x_cpb2stp(sc,
ncr53c9x_stp2cpb(sc,
ti->curr.period));
if ((ti->flags & T_SDTRSENT) == 0) {
/*
* target initiated negotiation
*/
if (ti->curr.period <
sc->sc_minsync)
ti->curr.period =
sc->sc_minsync;
if (ti->curr.offset >
sc->sc_maxoffset)
ti->curr.offset =
sc->sc_maxoffset;
ncr53c9x_sched_msgout(
SEND_SDTR);
}
}
ti->flags &= ~T_SDTRSENT;
ti->goal.period = ti->curr.period;
ti->goal.offset = ti->curr.offset;
ncr53c9x_setsync(sc, ti);
break;
case MSG_EXT_WDTR:
NCR_MSGS(("wide mode %d ", sc->sc_imess[3]));
ti->curr.width = sc->sc_imess[3];
if (!(ti->flags & T_WDTRSENT))
/*
* target initiated negotiation
*/
ncr53c9x_sched_msgout(SEND_WDTR);
ti->flags &= ~T_WDTRSENT;
ti->goal.width = ti->curr.width;
ncr53c9x_setsync(sc, ti);
break;
default:
xpt_print_path(ecb->ccb->ccb_h.path);
printf("unrecognized MESSAGE EXTENDED 0x%x;"
" sending REJECT\n", sc->sc_imess[2]);
goto reject;
}
break;
default:
NCR_MSGS(("ident "));
xpt_print_path(ecb->ccb->ccb_h.path);
printf("unrecognized MESSAGE 0x%x; sending REJECT\n",
sc->sc_imess[0]);
/* FALLTHROUGH */
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)) {
device_printf(sc->sc_dev, "TAG reselect without "
"IDENTIFY; MSG %x; sending DEVICE RESET\n",
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 {
device_printf(sc->sc_dev, "reselect without IDENTIFY;"
" MSG %x; sending DEVICE RESET\n", sc->sc_imess[1]);
goto reset;
}
(void)ncr53c9x_reselect(sc, sc->sc_msgify, 0, 0);
break;
default:
device_printf(sc->sc_dev, "unexpected MESSAGE IN; "
"sending DEVICE RESET\n");
/* FALLTHROUGH */
reset:
ncr53c9x_sched_msgout(SEND_DEV_RESET);
break;
abort:
ncr53c9x_sched_msgout(SEND_ABORT);
}
/* If we have more messages to send set ATN. */
if (sc->sc_msgpriq) {
NCRCMD(sc, NCRCMD_SETATN);
sc->sc_flags |= NCR_ATN;
}
/* Acknowledge 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.
*/
static void
ncr53c9x_msgout(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_tinfo *ti;
struct ncr53c9x_ecb *ecb;
size_t size;
int error;
#ifdef NCR53C9X_DEBUG
int i;
#endif
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_TRACE(("[%s(priq:%x, prevphase:%x)]", __func__, 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);
#if 0
DELAY(1);
#endif
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
device_printf(sc->sc_dev, "at line %d: unexpected "
"MESSAGE OUT phase\n", __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->ccb->ccb_h.target_id];
sc->sc_omess[0] = MSG_EXTENDED;
sc->sc_omess[1] = MSG_EXT_SDTR_LEN;
sc->sc_omess[2] = MSG_EXT_SDTR;
sc->sc_omess[3] = ti->goal.period;
sc->sc_omess[4] = ti->goal.offset;
sc->sc_omlen = 5;
break;
case SEND_WDTR:
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
sc->sc_omess[0] = MSG_EXTENDED;
sc->sc_omess[1] = MSG_EXT_WDTR_LEN;
sc->sc_omess[2] = MSG_EXT_WDTR;
sc->sc_omess[3] = ti->goal.width;
sc->sc_omlen = 4;
break;
case SEND_IDENTIFY:
if (sc->sc_state != NCR_CONNECTED)
device_printf(sc->sc_dev, "at line %d: no "
"nexus\n", __LINE__);
ecb = sc->sc_nexus;
sc->sc_omess[0] =
MSG_IDENTIFY(ecb->ccb->ccb_h.target_lun, 0);
break;
case SEND_TAG:
if (sc->sc_state != NCR_CONNECTED)
device_printf(sc->sc_dev, "at line %d: no "
"nexus\n", __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->ccb->ccb_h.target_id];
ti->curr.period = 0;
ti->curr.offset = 0;
ti->curr.width = MSG_EXT_WDTR_BUS_8_BIT;
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;
}
sc->sc_omp = sc->sc_omess;
}
#ifdef NCR53C9X_DEBUG
if ((ncr53c9x_debug & NCR_SHOWMSGS) != 0) {
NCR_MSGS(("<msgout:"));
for (i = 0; i < sc->sc_omlen; i++)
NCR_MSGS((" %02x", sc->sc_omess[i]));
NCR_MSGS(("> "));
}
#endif
if (sc->sc_rev != NCR_VARIANT_FAS366) {
/* (Re)send the message. */
size = ulmin(sc->sc_omlen, sc->sc_maxxfer);
error = NCRDMA_SETUP(sc, &sc->sc_omp, &sc->sc_omlen, 0, &size);
if (error != 0)
goto cmd;
/* 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);
return;
}
cmd:
/*
* XXX FIFO size
*/
sc->sc_cmdlen = 0;
ncr53c9x_flushfifo(sc);
ncr53c9x_wrfifo(sc, sc->sc_omp, sc->sc_omlen);
NCRCMD(sc, NCRCMD_TRANS);
}
void
ncr53c9x_intr(void *arg)
{
struct ncr53c9x_softc *sc = arg;
if (!NCRDMA_ISINTR(sc))
return;
NCR_LOCK(sc);
ncr53c9x_intr1(sc);
NCR_UNLOCK(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.
*/
static void
ncr53c9x_intr1(struct ncr53c9x_softc *sc)
{
struct ncr53c9x_ecb *ecb;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
struct timeval cur, wait;
size_t size;
int error, i, nfifo;
uint8_t msg;
NCR_LOCK_ASSERT(sc, MA_OWNED);
NCR_INTS(("[ncr53c9x_intr: state %d]", sc->sc_state));
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?
*/
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) {
device_printf(sc->sc_dev, "SCSI bus reset\n");
ncr53c9x_init(sc, 0); /* Restart everything. */
return;
}
#if 0
/*XXX*/ device_printf(sc->sc_dev, "<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",
device_get_nameunit(sc->sc_dev));
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->ccb->ccb_h.status = CAM_SEL_TIMEOUT;
ncr53c9x_done(sc, ecb);
}
return;
}
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 NCR53C9X_DEBUG
device_printf(sc->sc_dev, "ESP100 work-around "
"activated\n");
#endif
sc->sc_flags &= ~NCR_EXPECT_ILLCMD;
return;
}
/* Illegal command, out of sync? */
device_printf(sc->sc_dev, "illegal command: 0x%x "
"(state %d, phase %x, prevphase %x)\n",
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);
}
goto reset;
}
}
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)) {
if (NCRDMA_INTR(sc) == -1) {
device_printf(sc->sc_dev, "DMA error; resetting\n");
goto reset;
}
/* If DMA active here, then go back to work... */
if (NCRDMA_ISACTIVE(sc))
return;
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)
device_printf(sc->sc_dev,"!TC on MSGOUT"
" [intr %x, stat %x, step %d]"
" prevphase %x, resid %lx\n",
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.
*
* XXX This is fatal and usually means that
* the DMA engine is hopelessly out of
* sync with reality. A disk is likely
* getting spammed at this point.
*/
device_printf(sc->sc_dev, "!TC on DATA XFER"
" [intr %x, stat %x, step %d]"
" prevphase %x, resid %x\n",
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase,
ecb ? ecb->dleft : -1);
goto reset;
}
}
}
/*
* Check for less serious errors.
*/
if ((sc->sc_espstat & NCRSTAT_PE) != 0) {
device_printf(sc->sc_dev, "SCSI bus parity error\n");
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_INTS(("<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);
#if 0
DELAY(1);
#endif
}
/*
* 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->ccb->ccb_h.status = CAM_SEL_TIMEOUT;
/* Selection timeout -- discard all LUNs if empty. */
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
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 (ecb != NULL) {
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
if ((ti->flags & T_SDTRSENT) != 0) {
xpt_print_path(ecb->ccb->ccb_h.path);
printf("sync nego not completed!\n");
ti->flags &= ~T_SDTRSENT;
ti->curr.period = ti->goal.period = 0;
ti->curr.offset = ti->goal.offset = 0;
ncr53c9x_setsync(sc, ti);
}
if ((ti->flags & T_WDTRSENT) != 0) {
xpt_print_path(ecb->ccb->ccb_h.path);
printf("wide nego not completed!\n");
ti->flags &= ~T_WDTRSENT;
ti->curr.width = ti->goal.width =
MSG_EXT_WDTR_BUS_8_BIT;
ncr53c9x_setsync(sc, ti);
}
}
/* 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.
*/
device_printf(sc->sc_dev, "unexpected "
"disconnect [state %d, intr %x, stat %x, "
"phase(c %x, p %x)]; ", sc->sc_state,
sc->sc_espintr, sc->sc_espstat,
sc->sc_phase, sc->sc_prevphase);
/*
* XXX This will cause a chip reset and will
* prevent us from finding out the real
* problem with the device. However, it's
* necessary until a way can be found to
* safely cancel the DMA that is in
* progress.
*/
if (1 || (ecb->flags & ECB_SENSE) != 0) {
printf("resetting\n");
goto reset;
}
printf("sending REQUEST SENSE\n");
callout_stop(&ecb->ch);
ncr53c9x_sense(sc, ecb);
return;
} else if (ecb != NULL &&
(ecb->flags & ECB_RESET) != 0) {
ecb->ccb->ccb_h.status = CAM_REQ_CMP;
goto finish;
}
ecb->ccb->ccb_h.status = CAM_CMD_TIMEOUT;
goto finish;
case NCR_DISCONNECT:
sc->sc_nexus = NULL;
goto sched;
case NCR_CMDCOMPLETE:
ecb->ccb->ccb_h.status = CAM_REQ_CMP;
goto finish;
}
}
switch (sc->sc_state) {
case NCR_SBR:
device_printf(sc->sc_dev, "waiting for Bus Reset to happen\n");
return;
case NCR_RESELECTED:
/*
* We must be continuing a message?
*/
device_printf(sc->sc_dev, "unhandled reselect continuation, "
"state %d, intr %02x\n", sc->sc_state, sc->sc_espintr);
goto reset;
break;
case NCR_IDENTIFIED:
ecb = sc->sc_nexus;
if (sc->sc_phase != MESSAGE_IN_PHASE) {
i = NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF;
/*
* Things are seriously screwed up.
* Pull the brakes, i.e. reset.
*/
device_printf(sc->sc_dev, "target didn't send tag: %d "
"bytes in FIFO\n", i);
/* Drain and display FIFO. */
while (i-- > 0)
printf("[%d] ", NCR_READ_REG(sc, NCR_FIFO));
goto reset;
} else
goto msgin;
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_INTS(("backoff selector "));
callout_stop(&ecb->ch);
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 screwed up.
* Pull the brakes, i.e. reset
*/
device_printf(sc->sc_dev, "target didn't "
"identify\n");
goto reset;
}
/*
* 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 command bytes (for
* another target) some of those bytes can appear in
* the FIFO here, after the interrupt is taken.
*
* To remedy this situation, pull the Selection ID
* and Identify message from the FIFO directly, and
* ignore any extraneous FIFO contents. Also, set
* a flag that allows one Illegal Command Interrupt
* to occur which the chip also generates as a result
* of writing to the FIFO during a reselect.
*/
if (sc->sc_rev == NCR_VARIANT_ESP100) {
nfifo =
NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF;
sc->sc_imess[0] = NCR_READ_REG(sc, NCR_FIFO);
sc->sc_imess[1] = NCR_READ_REG(sc, NCR_FIFO);
sc->sc_imlen = 2;
if (nfifo != 2) {
/* Flush the rest. */
NCRCMD(sc, NCRCMD_FLUSH);
}
sc->sc_flags |= NCR_EXPECT_ILLCMD;
if (nfifo > 2)
nfifo = 2; /* We fixed it... */
} else
nfifo = ncr53c9x_rdfifo(sc, NCR_RDFIFO_START);
if (nfifo != 2) {
device_printf(sc->sc_dev, "RESELECT: %d bytes "
"in FIFO! [intr %x, stat %x, step %d, "
"prevphase %x]\n",
nfifo,
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase);
goto reset;
}
sc->sc_selid = sc->sc_imess[0];
NCR_INTS(("selid=%02x ", sc->sc_selid));
/* Handle IDENTIFY message. */
ncr53c9x_msgin(sc);
if (sc->sc_state != NCR_CONNECTED &&
sc->sc_state != NCR_IDENTIFIED) {
/* IDENTIFY fail?! */
device_printf(sc->sc_dev, "identify failed, "
"state %d, intr %02x\n", sc->sc_state,
sc->sc_espintr);
goto reset;
}
goto shortcut; /* i.e. 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.
*/
if (ecb == NULL) {
/*
* When doing path inquiry during boot
* FAS100A trigger a stray interrupt which
* we just ignore instead of panicing.
*/
if (sc->sc_state == NCR_IDLE &&
sc->sc_espstep == 0)
return;
panic("%s: no nexus", __func__);
}
ti = &sc->sc_tinfo[ecb->ccb->ccb_h.target_id];
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.
* XXX check for command phase?
*/
NCRCMD(sc, NCRCMD_RSTATN);
break;
case 1:
if (ti->curr.period == ti->goal.period &&
ti->curr.offset == ti->goal.offset &&
ti->curr.width == ti->goal.width &&
ecb->tag[0] == 0) {
device_printf(sc->sc_dev, "step 1 "
"and no negotiation to perform "
"or tag to send\n");
goto reset;
}
if (sc->sc_phase != MESSAGE_OUT_PHASE) {
device_printf(sc->sc_dev, "step 1 "
"but not in MESSAGE_OUT_PHASE\n");
goto reset;
}
sc->sc_prevphase = MESSAGE_OUT_PHASE; /* XXX */
if (ecb->flags & ECB_RESET) {
/*
* A DEVICE RESET was scheduled and
* ATNS used. As SEND_DEV_RESET has
* the highest priority, the target
* will reset and disconnect and we
* will end up in ncr53c9x_done w/o
* negotiating or sending a TAG. So
* we just break here in order to
* avoid warnings about negotiation
* not having completed.
*/
ncr53c9x_sched_msgout(SEND_DEV_RESET);
break;
}
if (ti->curr.width != ti->goal.width) {
ti->flags |= T_WDTRSENT | T_SDTRSENT;
ncr53c9x_sched_msgout(SEND_WDTR |
SEND_SDTR);
}
if (ti->curr.period != ti->goal.period ||
ti->curr.offset != ti->goal.offset) {
ti->flags |= T_SDTRSENT;
ncr53c9x_sched_msgout(SEND_SDTR);
}
if (ecb->tag[0] != 0)
/* Could not do ATN3 so send TAG. */
ncr53c9x_sched_msgout(SEND_TAG);
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;
}
xpt_print_path(ecb->ccb->ccb_h.path);
printf("selection failed; %d left in FIFO "
"[intr %x, stat %x, step %d]\n",
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;
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) {
xpt_print_path(ecb->ccb->ccb_h.path);
printf("select; %lu left in DMA buffer "
"[intr %x, stat %x, step %d]\n",
(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 {
device_printf(sc->sc_dev, "unexpected status after "
"select: [intr %x, stat %x, step %x]\n",
sc->sc_espintr, sc->sc_espstat, sc->sc_espstep);
NCRCMD(sc, NCRCMD_FLUSH);
DELAY(1);
goto reset;
}
if (sc->sc_state == NCR_IDLE) {
device_printf(sc->sc_dev, "stray interrupt\n");
return;
}
break;
case NCR_CONNECTED:
if ((sc->sc_flags & NCR_ICCS) != 0) {
/* "Initiate Command Complete Steps" in progress */
sc->sc_flags &= ~NCR_ICCS;
if ((sc->sc_espintr & NCRINTR_DONE) == 0) {
device_printf(sc->sc_dev, "ICCS: "
": [intr %x, stat %x, step %x]\n",
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
ncr53c9x_rdfifo(sc, NCR_RDFIFO_START);
if (sc->sc_imlen < 2)
device_printf(sc->sc_dev, "can't get status, "
"only %d bytes\n", (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->ccb->csio.resid = ecb->dleft;
sc->sc_state = NCR_CMDCOMPLETE;
} else
device_printf(sc->sc_dev, "STATUS_PHASE: "
"msg %d\n", msg);
sc->sc_imlen = 0;
NCRCMD(sc, NCRCMD_MSGOK);
goto shortcut; /* i.e. wait for disconnect */
}
break;
default:
device_printf(sc->sc_dev, "invalid state: %d [intr %x, "
"phase(c %x, p %x)]\n", sc->sc_state,
sc->sc_espintr, sc->sc_phase, sc->sc_prevphase);
goto reset;
}
/*
* 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("%s: no nexus", __func__);
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) != 0) {
if ((sc->sc_rev != NCR_VARIANT_FAS366) ||
(sc->sc_espstat2 & NCRFAS_STAT2_EMPTY) == 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) {
device_printf(sc->sc_dev, "MSGIN: unexpected "
"FC bit: [intr %x, stat %x, step %x]\n",
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
device_printf(sc->sc_dev, "MSGIN: weird bits: "
"[intr %x, stat %x, step %x]\n",
sc->sc_espintr, sc->sc_espstat, sc->sc_espstep);
sc->sc_prevphase = MESSAGE_IN_PHASE;
goto shortcut; /* i.e. expect data to be ready */
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);
#if 0
DELAY(1);
#endif
}
/*
* If we have more messages to send, e.g. WDTR or SDTR
* after we've sent a TAG, set ATN so we'll go back to
* MESSAGE_OUT_PHASE.
*/
if (sc->sc_msgpriq) {
NCRCMD(sc, NCRCMD_SETATN);
sc->sc_flags |= NCR_ATN;
}
if (sc->sc_features & NCR_F_DMASELECT) {
/* Setup DMA transfer for command. */
size = ecb->clen;
sc->sc_cmdlen = size;
sc->sc_cmdp = (void *)&ecb->cmd.cmd;
error = NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen,
0, &size);
if (error != 0)
goto cmd;
/* 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);
sc->sc_prevphase = COMMAND_PHASE;
break;
}
cmd:
sc->sc_cmdlen = 0;
ncr53c9x_wrfifo(sc, (uint8_t *)&ecb->cmd.cmd, ecb->clen);
NCRCMD(sc, NCRCMD_TRANS);
sc->sc_prevphase = COMMAND_PHASE;
break;
case DATA_OUT_PHASE:
NCR_PHASE(("DATA_OUT_PHASE [%ld] ", (long)sc->sc_dleft));
sc->sc_prevphase = DATA_OUT_PHASE;
NCRCMD(sc, NCRCMD_FLUSH);
size = ulmin(sc->sc_dleft, sc->sc_maxxfer);
error = NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft, 0, &size);
goto setup_xfer;
case DATA_IN_PHASE:
NCR_PHASE(("DATA_IN_PHASE "));
sc->sc_prevphase = DATA_IN_PHASE;
if (sc->sc_rev == NCR_VARIANT_ESP100)
NCRCMD(sc, NCRCMD_FLUSH);
size = ulmin(sc->sc_dleft, sc->sc_maxxfer);
error = NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft, 1, &size);
setup_xfer:
if (error != 0) {
switch (error) {
case EFBIG:
ecb->ccb->ccb_h.status |= CAM_REQ_TOO_BIG;
break;
case EINPROGRESS:
panic("%s: cannot deal with deferred DMA",
__func__);
case EINVAL:
ecb->ccb->ccb_h.status |= CAM_REQ_INVALID;
break;
case ENOMEM:
ecb->ccb->ccb_h.status |= CAM_REQUEUE_REQ;
break;
default:
ecb->ccb->ccb_h.status |= CAM_REQ_CMP_ERR;
}
goto finish;
}
/* 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;
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 */
case INVALID_PHASE:
break;
default:
device_printf(sc->sc_dev,
"unexpected bus phase; resetting\n");
goto reset;
}
return;
reset:
ncr53c9x_init(sc, 1);
return;
finish:
ncr53c9x_done(sc, ecb);
return;
sched:
sc->sc_state = NCR_IDLE;
ncr53c9x_sched(sc);
return;
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 20 MHz, 2 at 25 MHz and
* 1 at 40 MHz. This needs testing.
*/
microtime(&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;
microtime(&cur);
} while (cur.tv_sec <= wait.tv_sec && cur.tv_usec <= wait.tv_usec);
}
static void
ncr53c9x_abort(struct ncr53c9x_softc *sc, struct ncr53c9x_ecb *ecb)
{
NCR_LOCK_ASSERT(sc, MA_OWNED);
/* 2 secs for the abort */
ecb->timeout = NCR_ABORT_TIMEOUT;
ecb->flags |= ECB_ABORT;
if (ecb == sc->sc_nexus) {
/*
* If we're still selecting, the message will be scheduled
* after selection is complete.
*/
if (sc->sc_state == NCR_CONNECTED)
ncr53c9x_sched_msgout(SEND_ABORT);
/*
* Reschedule callout.
*/
callout_reset(&ecb->ch, mstohz(ecb->timeout),
ncr53c9x_callout, 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);
}
}
static void
ncr53c9x_callout(void *arg)
{
struct ncr53c9x_ecb *ecb = arg;
union ccb *ccb = ecb->ccb;
struct ncr53c9x_softc *sc = ecb->sc;
struct ncr53c9x_tinfo *ti;
NCR_LOCK_ASSERT(sc, MA_OWNED);
ti = &sc->sc_tinfo[ccb->ccb_h.target_id];
xpt_print_path(ccb->ccb_h.path);
device_printf(sc->sc_dev, "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 defined(NCR53C9X_DEBUG) && NCR53C9X_DEBUG > 1
printf("TRACE: %s.", ecb->trace);
#endif
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");
ccb->ccb_h.status = CAM_CMD_TIMEOUT;
ncr53c9x_abort(sc, ecb);
/* Disable sync mode if stuck in a data phase. */
if (ecb == sc->sc_nexus && ti->curr.offset != 0 &&
(sc->sc_phase & (MSGI | CDI)) == 0) {
/* XXX ASYNC CALLBACK! */
ti->goal.offset = 0;
xpt_print_path(ccb->ccb_h.path);
printf("sync negotiation disabled\n");
}
}
}
static void
ncr53c9x_watch(void *arg)
{
struct ncr53c9x_softc *sc = arg;
struct ncr53c9x_linfo *li;
struct ncr53c9x_tinfo *ti;
time_t old;
int t;
NCR_LOCK_ASSERT(sc, MA_OWNED);
/* Delete any structures that have not been used in 10min. */
old = time_second - (10 * 60);
for (t = 0; t < sc->sc_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);
}
}
callout_reset(&sc->sc_watchdog, 60 * hz, ncr53c9x_watch, sc);
}
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