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freebsd-skq/sys/alpha/tc/esp.c

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/* $FreeBSD$ */
/* $NetBSD: esp.c,v 1.8.4.2 1996/09/10 17:28:16 cgd Exp $ */
/*
* Copyright (c) 1994 Peter Galbavy
* Copyright (c) 1995 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Peter Galbavy
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Based on aic6360 by Jarle Greipsland
*
* Acknowledgements: Many of the algorithms used in this driver are
* inspired by the work of Julian Elischer (julian@tfs.com) and
* Charles Hannum (mycroft@duality.gnu.ai.mit.edu). Thanks a million!
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/errno.h>
/*#include <sys/ioctl.h>*/
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/proc.h>
/*#include <sys/user.h>*/
#include <sys/queue.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_message.h>
#include <machine/cpu.h>
#include <machine/clock.h>
#include <alpha/tc/tcreg.h>
#include <alpha/tc/tcvar.h>
#include <alpha/tc/tcdsreg.h>
#include <alpha/tc/tcdsvar.h>
#include <alpha/tc/espreg.h>
#include <alpha/tc/espvar.h>
int esp_debug = 0; /*ESP_SHOWPHASE|ESP_SHOWMISC|ESP_SHOWTRAC|ESP_SHOWCMDS;*/
/*static*/ void espattach (device_t, device_t, void *);
/*static*/ int espmatch (device_t, void *, void *);
/*static*/ int espprint (void *, char *);
/*static*/ u_int esp_adapter_info(struct esp_softc *);
/*static*/ void espreadregs (struct esp_softc *);
/*static*/ void espselect (struct esp_softc *,
u_char, u_char, u_char *, u_char);
/*static*/ void esp_scsi_reset (struct esp_softc *);
/*static*/ void esp_reset (struct esp_softc *);
/*static*/ void esp_init (struct esp_softc *, int);
/*static*/ int esp_scsi_cmd (struct scsi_xfer *);
/*static*/ int esp_poll (struct esp_softc *, struct ecb *);
/*static*/ void esp_sched (struct esp_softc *);
/*static*/ void esp_done (struct ecb *);
/*static*/ void esp_msgin (struct esp_softc *);
/*static*/ void esp_msgout (struct esp_softc *);
/*static*/ int espintr (struct esp_softc *);
/*static*/ void esp_timeout (void *arg);
/*static*/ void esp_abort (struct esp_softc *, struct ecb *);
static u_int32_t esp_info (int);
int esp_stp2cpb(struct esp_softc *, int);
int esp_cpb2stp(struct esp_softc *, int);
static void esp_min_phys (struct buf *);
static int esp_probe(device_t dev);
static int esp_attach(device_t dev);
static device_method_t esp_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, esp_probe),
DEVMETHOD(device_attach, esp_attach),
{0, 0}
};
#define ESP_SOFTC(dev) (struct esp_softc*) device_get_softc(dev)
static driver_t esp_driver = {
"esp",
esp_methods,
sizeof(struct esp_softc),
};
struct scsi_adapter esp_switch = {
esp_scsi_cmd,
esp_min_phys, /* no max at this level; handled by DMA code */
NULL,
NULL,
esp_info,
"esp",
};
struct scsi_device esp_dev = {
NULL, /* Use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* Use default 'done' routine */
};
static devclass_t esp_devclass;
DRIVER_MODULE(esp, tcds, esp_driver, esp_devclass, 0, 0);
static int
esp_probe(device_t dev)
{
if(strcmp(device_get_name(device_get_parent(dev)),"tcds")){
return ENXIO;
} else {
device_set_desc(dev,"NCR53C94");
return(0);
}
}
/*
* Attach this instance, and then all the sub-devices
*/
int
esp_attach(device_t dev)
{
struct esp_softc *sc = device_get_softc(dev);
struct tcdsdev_attach_args *tcdsdev = device_get_ivars(dev);
struct scsibus_data *scbus;
sc->sc_reg = (volatile u_int32_t *)tcdsdev->tcdsda_addr;
sc->sc_cookie = tcdsdev->tcdsda_cookie;
sc->sc_dma = tcdsdev->tcdsda_sc;
tcds_intr_establish(device_get_parent(dev), sc->sc_cookie, 0,(int (*)(void *))espintr, sc);
/* if (parent->dv_cfdata->cf_driver == &tcds_cd) {
sc->sc_id = tcdsdev->tcdsda_id;
sc->sc_freq = tcdsdev->tcdsda_freq;
} else*/ {
/* XXX */
sc->sc_id = 7;
sc->sc_freq = 25000000;
}
/* gimme Mhz */
sc->sc_freq /= 1000000;
sc->sc_dma->sc_esp = sc; /* XXX */
/*
* It is necessary to try to load the 2nd config register here,
* to find out what rev the esp chip is, else the esp_reset
* will not set up the defaults correctly.
*/
sc->sc_cfg1 = sc->sc_id | ESPCFG1_PARENB;
sc->sc_cfg2 = ESPCFG2_SCSI2;
sc->sc_cfg3 = 0x4; /* Save residual byte. XXX??? */
sc->sc_rev = NCR53C94;
/*
* This is the value used to start sync negotiations
* Note that the ESP register "SYNCTP" is programmed
* in "clocks per byte", and has a minimum value of 4.
* The SCSI period used in negotiation is one-fourth
* of the time (in nanoseconds) needed to transfer one byte.
* Since the chip's clock is given in MHz, we have the following
* formula: 4 * period = (1000 / freq) * 4
*/
sc->sc_minsync = 1000 / sc->sc_freq;
sc->sc_maxxfer = 64 * 1024;
sc->sc_ccf = FREQTOCCF(sc->sc_freq);
/* The value *must not* be == 1. Make it 2 */
if (sc->sc_ccf == 1)
sc->sc_ccf = 2;
/*
* The recommended timeout is 250ms. This register is loaded
* with a value calculated as follows, from the docs:
*
* (timout period) x (CLK frequency)
* reg = -------------------------------------
* 8192 x (Clock Conversion Factor)
*
* Since CCF has a linear relation to CLK, this generally computes
* to the constant of 153.
*/
sc->sc_timeout = ((250 * 1000) * sc->sc_freq) / (8192 * sc->sc_ccf);
/* CCF register only has 3 bits; 0 is actually 8 */
sc->sc_ccf &= 7;
/* Reset state & bus */
sc->sc_state = 0;
esp_init(sc, 1);
printf("esp%d: %dMhz, target %d\n", device_get_unit(dev),sc->sc_freq, sc->sc_id);
/*
* fill in the prototype scsi_link.
*/
sc->sc_link.adapter_softc = sc;
sc->sc_link.adapter_targ = sc->sc_id;
sc->sc_link.adapter = &esp_switch;
sc->sc_link.device = &esp_dev;
/* sc->sc_link.openings = 2;*/
sc->sc_link.fordriver = 0;
/*
* If the boot path is "esp" at the moment and it's me, then
* walk our pointer to the sub-device, ready for the config
* below.
*/
/*
* Now try to attach all the sub-devices
*/
/* config_found(self, &sc->sc_link, espprint);*/
scbus = scsi_alloc_bus();
if(!scbus)
return ENXIO;
scbus->adapter_link = &sc->sc_link;
scbus->maxtarg = 7;
if (bootverbose) {
unsigned t_from = 0;
unsigned t_to = scbus->maxtarg;
unsigned myaddr = sc->sc_id;
char *txt_and = "";
printf ("esp%d scanning for targets ", device_get_unit(dev));
if (t_from < myaddr) {
printf ("%d..%d ", t_from, myaddr -1);
txt_and = "and ";
}
if (myaddr < t_to)
printf ("%s%d..%d ", txt_and, myaddr +1, t_to);
}
scsi_attachdevs (scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
return 0;
}
/*
* This is the generic esp reset function. It does not reset the SCSI bus,
* only this controllers, but kills any on-going commands, and also stops
* and resets the DMA.
*
* After reset, registers are loaded with the defaults from the attach
* routine above.
*/
void
esp_reset(sc)
struct esp_softc *sc;
{
/* reset DMA first */
DMA_RESET(sc->sc_dma);
/* reset SCSI chip */
ESPCMD(sc, ESPCMD_RSTCHIP);
ESPCMD(sc, ESPCMD_NOP);
DELAY(500);
/* do these backwards, and fall through */
switch (sc->sc_rev) {
case NCR53C94:
case ESP200:
ESP_WRITE_REG(sc, ESP_CFG3, sc->sc_cfg3);
case ESP100A:
ESP_WRITE_REG(sc, ESP_CFG2, sc->sc_cfg2);
case ESP100:
ESP_WRITE_REG(sc, ESP_CFG1, sc->sc_cfg1);
ESP_WRITE_REG(sc, ESP_CCF, sc->sc_ccf);
ESP_WRITE_REG(sc, ESP_SYNCOFF, 0);
ESP_WRITE_REG(sc, ESP_TIMEOUT, sc->sc_timeout);
break;
default:
printf("%s: unknown revision code, assuming ESP100\n",
device_get_nameunit(sc->sc_dev));
ESP_WRITE_REG(sc, ESP_CFG1, sc->sc_cfg1);
ESP_WRITE_REG(sc, ESP_CCF, sc->sc_ccf);
ESP_WRITE_REG(sc, ESP_SYNCOFF, 0);
ESP_WRITE_REG(sc, ESP_TIMEOUT, sc->sc_timeout);
}
}
/*
* Reset the SCSI bus, but not the chip
*/
void
esp_scsi_reset(sc)
struct esp_softc *sc;
{
/*
* XXX STOP DMA FIRST
*/
printf("esp: resetting SCSI bus\n");
ESPCMD(sc, ESPCMD_RSTSCSI);
}
u_int32_t esp_info (int unit)
{
return (1); /* may be changed later */
}
/*
* Initialize esp state machine
*/
void
esp_init(sc, doreset)
struct esp_softc *sc;
int doreset;
{
struct ecb *ecb;
int r;
ESP_TRACE(("[ESP_INIT(%d)] ", doreset));
if (sc->sc_state == 0) { /* First time through */
TAILQ_INIT(&sc->ready_list);
TAILQ_INIT(&sc->nexus_list);
TAILQ_INIT(&sc->free_list);
sc->sc_nexus = NULL;
ecb = sc->sc_ecb;
bzero(ecb, sizeof(sc->sc_ecb));
for (r = 0; r < sizeof(sc->sc_ecb) / sizeof(*ecb); r++) {
TAILQ_INSERT_TAIL(&sc->free_list, ecb, chain);
ECB_SETQ(ecb, ECB_QFREE);
ecb++;
}
bzero(sc->sc_tinfo, sizeof(sc->sc_tinfo));
} else {
sc->sc_flags |= ESP_ABORTING;
sc->sc_state = ESP_IDLE;
ecb = sc->sc_nexus;
if (ecb != NULL) {
ecb->xs->error = XS_TIMEOUT;
esp_done(ecb);
sc->sc_nexus = NULL;
}
while ((ecb = TAILQ_FIRST(&sc->nexus_list)) != NULL) {
ecb->xs->error = XS_TIMEOUT;
esp_done(ecb);
}
}
/*
* reset the chip to a known state
*/
esp_reset(sc);
sc->sc_phase = sc->sc_prevphase = INVALID_PHASE;
for (r = 0; r < 8; r++) {
struct esp_tinfo *tp = &sc->sc_tinfo[r];
/* XXX - config flags per target: low bits: no reselect; high bits: no synch */
/* int fl = sc->sc_dev.dv_cfdata->cf_flags;*/
int fl=0;
tp->flags = ((sc->sc_minsync && !(fl & (1<<(r+8))))
? T_NEGOTIATE : 0) |
((fl & (1<<r)) ? T_RSELECTOFF : 0) |
T_NEED_TO_RESET;
tp->period = sc->sc_minsync;
tp->offset = 0;
}
sc->sc_flags &= ~ESP_ABORTING;
if (doreset) {
sc->sc_state = ESP_SBR;
ESPCMD(sc, ESPCMD_RSTSCSI);
return;
}
sc->sc_state = ESP_IDLE;
esp_sched(sc);
return;
}
/*
* Read the ESP registers, and save their contents for later use.
* ESP_STAT, ESP_STEP & ESP_INTR are mostly zeroed out when reading
* ESP_INTR - so make sure it is the last read.
*
* I think that (from reading the docs) most bits in these registers
* only make sense when he DMA CSR has an interrupt showing. Call only
* if an interrupt is pending.
*/
void
espreadregs(sc)
struct esp_softc *sc;
{
sc->sc_espstat = ESP_READ_REG(sc, ESP_STAT);
/* Only the stepo bits are of interest */
sc->sc_espstep = ESP_READ_REG(sc, ESP_STEP) & ESPSTEP_MASK;
sc->sc_espintr = ESP_READ_REG(sc, ESP_INTR);
/* Clear the TCDS interrupt bit. */
(void)tcds_scsi_isintr(sc->sc_dma, 1);
/*
* 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 & ESPINTR_DIS)
? /* Disconnected */ BUSFREE_PHASE
: sc->sc_espstat & ESPSTAT_PHASE;
ESP_MISC(("regs[intr=%02x,stat=%02x,step=%02x] ",
sc->sc_espintr, sc->sc_espstat, sc->sc_espstep));
}
/*
* Convert Synchronous Transfer Period to chip register Clock Per Byte value.
*/
int
esp_stp2cpb(sc, period)
struct esp_softc *sc;
int period;
{
int v;
v = (sc->sc_freq * period) / 250;
if (esp_cpb2stp(sc, v) < period)
/* Correct round-down error */
v++;
return v;
}
/*
* Convert chip register Clock Per Byte value to Synchronous Transfer Period.
*/
int
esp_cpb2stp(sc, cpb)
struct esp_softc *sc;
int cpb;
{
return ((250 * cpb) / sc->sc_freq);
}
/*
* Send a command to a target, set the driver state to ESP_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
espselect(sc, target, lun, cmd, clen)
struct esp_softc *sc;
u_char target, lun;
u_char *cmd;
u_char clen;
{
struct esp_tinfo *ti = &sc->sc_tinfo[target];
int i;
ESP_TRACE(("[espselect(t%d,l%d,cmd:%x)] ", target, lun, *(u_char *)cmd));
/* new state ESP_SELECTING */
sc->sc_state = ESP_SELECTING;
ESPCMD(sc, ESPCMD_FLUSH);
/*
* The docs say the target register is never reset, and I
* can't think of a better place to set it
*/
ESP_WRITE_REG(sc, ESP_SELID, target);
if (ti->flags & T_SYNCMODE) {
ESP_WRITE_REG(sc, ESP_SYNCOFF, ti->offset);
ESP_WRITE_REG(sc, ESP_SYNCTP, esp_stp2cpb(sc, ti->period));
} else {
ESP_WRITE_REG(sc, ESP_SYNCOFF, 0);
ESP_WRITE_REG(sc, ESP_SYNCTP, 0);
}
/*
* Who am I. This is where we tell the target that we are
* happy for it to disconnect etc.
*/
ESP_WRITE_REG(sc, ESP_FIFO,
MSG_IDENTIFY(lun, (ti->flags & T_RSELECTOFF)?0:1));
if (ti->flags & T_NEGOTIATE) {
/* Arbitrate, select and stop after IDENTIFY message */
ESPCMD(sc, ESPCMD_SELATNS);
return;
}
/* Now the command into the FIFO */
for (i = 0; i < clen; i++)
ESP_WRITE_REG(sc, ESP_FIFO, *cmd++);
/* And get the targets attention */
ESPCMD(sc, ESPCMD_SELATN);
}
/*
* DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS
*/
/*
* Start a SCSI-command
* This function is called by the higher level SCSI-driver to queue/run
* SCSI-commands.
*/
int
esp_scsi_cmd(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct esp_softc *sc = sc_link->adapter_softc;
struct ecb *ecb;
int s, flags;
ESP_TRACE(("[esp_scsi_cmd] "));
ESP_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen,
sc_link->target));
flags = xs->flags;
/* Get a esp command block */
s = splbio();
ecb = TAILQ_FIRST(&sc->free_list);
if (ecb) {
TAILQ_REMOVE(&sc->free_list, ecb, chain);
ECB_SETQ(ecb, ECB_QNONE);
}
splx(s);
if (ecb == NULL) {
ESP_MISC(("TRY_AGAIN_LATER"));
return TRY_AGAIN_LATER;
}
/* Initialize ecb */
ecb->xs = xs;
bcopy(xs->cmd, &ecb->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_SETQ(ecb, ECB_QREADY);
ecb->timeout_ch = timeout(esp_timeout, ecb, (xs->timeout*hz)/1000);
if (sc->sc_state == ESP_IDLE)
esp_sched(sc);
splx(s);
if (flags & SCSI_NOMASK) {
/* Not allowed to use interrupts, use polling instead */
return esp_poll(sc, ecb);
}
ESP_MISC(("SUCCESSFULLY_QUEUED"));
return SUCCESSFULLY_QUEUED;
}
/*
* Used when interrupt driven I/O isn't allowed, e.g. during boot.
*/
int
esp_poll(sc, ecb)
struct esp_softc *sc;
struct ecb *ecb;
{
struct scsi_xfer *xs = ecb->xs;
int count = xs->timeout * 100;
ESP_TRACE(("[esp_poll] "));
while (count) {
if (DMA_ISINTR(sc->sc_dma)) {
espintr(sc);
}
#if alternatively
if (ESP_READ_REG(sc, ESP_STAT) & ESPSTAT_INT)
espintr(sc);
#endif
if (xs->flags & ITSDONE)
break;
DELAY(10);
if (sc->sc_state == ESP_IDLE) {
ESP_TRACE(("[esp_poll: rescheduling] "));
esp_sched(sc);
}
count--;
}
if (count == 0) {
ESP_MISC(("esp_poll: timeout"));
esp_timeout((caddr_t)ecb);
}
return COMPLETE;
}
/*
* 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 esp_scsi_cmd and esp_done. This may
* save us an unecessary interrupt just to get things going. Should only be
* called when state == ESP_IDLE and at bio pl.
*/
void
esp_sched(sc)
struct esp_softc *sc;
{
struct scsi_link *sc_link;
struct ecb *ecb;
int t;
ESP_TRACE(("[esp_sched] "));
if (sc->sc_state != ESP_IDLE)
panic("esp_sched: not IDLE (state=%d)", sc->sc_state);
if (sc->sc_flags & ESP_ABORTING)
return;
/*
* 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;
t = sc_link->target;
if (!(sc->sc_tinfo[t].lubusy & (1 << sc_link->lun))) {
struct esp_tinfo *ti = &sc->sc_tinfo[t];
if ((ecb->flags & ECB_QBITS) != ECB_QREADY)
panic("esp: busy entry on ready list");
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
ECB_SETQ(ecb, ECB_QNONE);
sc->sc_nexus = ecb;
sc->sc_flags = 0;
sc->sc_prevphase = INVALID_PHASE;
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
ti->lubusy |= (1<<sc_link->lun);
/*XXX*/if (sc->sc_msgpriq) {
printf("esp: message queue not empty: %x!\n", sc->sc_msgpriq);
}
/*XXX*/sc->sc_msgpriq = sc->sc_msgout = 0;
espselect(sc, t, sc_link->lun,
(u_char *)&ecb->cmd, ecb->clen);
break;
} else
ESP_MISC(("%d:%d busy\n", t, sc_link->lun));
}
}
/*
* POST PROCESSING OF SCSI_CMD (usually current)
*/
void
esp_done(ecb)
struct ecb *ecb;
{
struct scsi_xfer *xs = ecb->xs;
struct scsi_link *sc_link = xs->sc_link;
struct esp_softc *sc = sc_link->adapter_softc;
struct esp_tinfo *ti = &sc->sc_tinfo[sc_link->target];
ESP_TRACE(("[esp_done(error:%x)] ", xs->error));
untimeout(esp_timeout, ecb, ecb->timeout_ch);
/*
* Now, if we've come here with no error code, i.e. we've kept the
* initial XS_NOERROR, and the status code signals that we should
* check sense, we'll need to set up a request sense cmd block and
* push the command back into the ready queue *before* any other
* commands for this target/lunit, else we lose the sense info.
* We don't support chk sense conditions for the request sense cmd.
*/
if (xs->error == XS_NOERROR) {
if ((ecb->flags & ECB_ABORTED) != 0) {
xs->error = XS_TIMEOUT;
} else if ((ecb->flags & ECB_CHKSENSE) != 0) {
xs->error = XS_SENSE;
} else if ((ecb->stat & ST_MASK) == SCSI_CHECK) {
struct scsi_sense *ss = (void *)&ecb->cmd;
ESP_MISC(("requesting sense "));
/* First, save the return values */
xs->resid = ecb->dleft;
xs->status = ecb->stat;
/* Next, setup a request sense command block */
bzero(ss, sizeof(*ss));
ss->op_code = 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_CHKSENSE;
/*XXX - must take off queue here */
if (ecb != sc->sc_nexus) {
panic("%s: esp_sched: floating ecb %p",
device_get_nameunit(sc->sc_dev), ecb);
}
TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain);
ECB_SETQ(ecb, ECB_QREADY);
ti->lubusy &= ~(1<<sc_link->lun);
ti->senses++;
timeout(esp_timeout, ecb, (xs->timeout*hz)/1000);
if (sc->sc_nexus == ecb) {
sc->sc_nexus = NULL;
sc->sc_state = ESP_IDLE;
esp_sched(sc);
}
return;
} else {
xs->resid = ecb->dleft;
}
}
xs->flags |= ITSDONE;
#ifdef ESP_DEBUG
if (esp_debug & ESP_SHOWMISC) {
printf("err=0x%02x ",xs->error);
if (xs->error == XS_SENSE) {
printf("sense=%2x; ", xs->sense.error_code);
}
}
if ((xs->resid || xs->error > XS_SENSE) && esp_debug & ESP_SHOWMISC) {
if (xs->resid)
printf("esp_done: resid=%d\n", xs->resid);
if (xs->error)
printf("esp_done: error=%d\n", xs->error);
}
#endif
/*
* Remove the ECB from whatever queue it's on.
*/
switch (ecb->flags & ECB_QBITS) {
case ECB_QNONE:
if (ecb != sc->sc_nexus) {
panic("%s: floating ecb",
device_get_nameunit(sc->sc_dev));
}
sc->sc_nexus = NULL;
sc->sc_state = ESP_IDLE;
ti->lubusy &= ~(1<<sc_link->lun);
esp_sched(sc);
break;
case ECB_QREADY:
TAILQ_REMOVE(&sc->ready_list, ecb, chain);
break;
case ECB_QNEXUS:
TAILQ_REMOVE(&sc->nexus_list, ecb, chain);
ti->lubusy &= ~(1<<sc_link->lun);
break;
case ECB_QFREE:
panic("%s: dequeue: busy ecb on free list",
device_get_nameunit(sc->sc_dev));
break;
default:
panic("%s: dequeue: unknown queue %d",
device_get_nameunit(sc->sc_dev),ecb->flags & ECB_QBITS);
}
/* Put it on the free list, and clear flags. */
TAILQ_INSERT_HEAD(&sc->free_list, ecb, chain);
ecb->flags = ECB_QFREE;
ti->cmds++;
scsi_done(xs);
return;
}
/*
* 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 esp_sched_msgout(m) \
do { \
ESP_MISC(("esp_sched_msgout %d ", m)); \
ESPCMD(sc, ESPCMD_SETATN); \
sc->sc_msgpriq |= (m); \
} while (0)
#define IS1BYTEMSG(m) (((m) != 1 && (m) < 0x20) || (m) & 0x80)
#define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20)
#define ISEXTMSG(m) ((m) == 1)
/*
* Get an incoming message as initiator.
*
* The SCSI bus must already be in MESSAGE_IN_PHASE and there is a
* byte in the FIFO
*/
void
esp_msgin(sc)
register struct esp_softc *sc;
{
register int v;
ESP_TRACE(("[esp_msgin(curmsglen:%d)] ", sc->sc_imlen));
if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) == 0) {
printf("%s: msgin: no msg byte available\n",
device_get_nameunit(sc->sc_dev));
return;
}
/*
* Prepare for a new message. A message should (according
* to the SCSI standard) be transmitted in one single
* MESSAGE_IN_PHASE. If we have been in some other phase,
* then this is a new message.
*/
if (sc->sc_prevphase != MESSAGE_IN_PHASE) {
sc->sc_flags &= ~ESP_DROP_MSGI;
sc->sc_imlen = 0;
}
v = ESP_READ_REG(sc, ESP_FIFO);
ESP_MISC(("<msgbyte:0x%02x>", v));
#if 0
if (sc->sc_state == ESP_RESELECTED && sc->sc_imlen == 0) {
/*
* Which target is reselecting us? (The ID bit really)
*/
sc->sc_selid = v;
sc->sc_selid &= ~(1<<sc->sc_id);
ESP_MISC(("selid=0x%2x ", sc->sc_selid));
return;
}
#endif
sc->sc_imess[sc->sc_imlen] = v;
/*
* If we're going to reject the message, don't bother storing
* the incoming bytes. But still, we need to ACK them.
*/
if ((sc->sc_flags & ESP_DROP_MSGI)) {
ESPCMD(sc, ESPCMD_SETATN);
ESPCMD(sc, ESPCMD_MSGOK);
printf("<dropping msg byte %x>",
sc->sc_imess[sc->sc_imlen]);
return;
}
if (sc->sc_imlen >= ESP_MAX_MSG_LEN) {
esp_sched_msgout(SEND_REJECT);
sc->sc_flags |= ESP_DROP_MSGI;
} else {
sc->sc_imlen++;
/*
* This testing is suboptimal, but most
* messages will be of the one byte variety, so
* it should not effect performance
* significantly.
*/
if (sc->sc_imlen == 1 && IS1BYTEMSG(sc->sc_imess[0]))
goto gotit;
if (sc->sc_imlen == 2 && IS2BYTEMSG(sc->sc_imess[0]))
goto gotit;
if (sc->sc_imlen >= 3 && ISEXTMSG(sc->sc_imess[0]) &&
sc->sc_imlen == sc->sc_imess[1] + 2)
goto gotit;
}
/* Ack what we have so far */
ESPCMD(sc, ESPCMD_MSGOK);
return;
gotit:
ESP_MSGS(("gotmsg(%x)", sc->sc_imess[0]));
/*
* Now we should have a complete message (1 byte, 2 byte
* and moderately long extended messages). We only handle
* extended messages which total length is shorter than
* ESP_MAX_MSG_LEN. Longer messages will be amputated.
*/
if (sc->sc_state == ESP_HASNEXUS) {
struct ecb *ecb = sc->sc_nexus;
struct esp_tinfo *ti = &sc->sc_tinfo[ecb->xs->sc_link->target];
switch (sc->sc_imess[0]) {
case MSG_CMDCOMPLETE:
ESP_MSGS(("cmdcomplete "));
if (sc->sc_dleft < 0) {
struct scsi_link *sc_link = ecb->xs->sc_link;
printf("esp: %d extra bytes from %d:%d\n",
-sc->sc_dleft,
sc_link->target, sc_link->lun);
sc->sc_dleft = 0;
}
ecb->xs->resid = ecb->dleft = sc->sc_dleft;
sc->sc_flags |= ESP_BUSFREE_OK;
break;
case MSG_MESSAGE_REJECT:
if (esp_debug & ESP_SHOWMSGS)
printf("%s: our msg rejected by target\n",
device_get_nameunit(sc->sc_dev));
#if 1 /* XXX - must remember last message */
sc_print_addr(ecb->xs->sc_link); printf("MSG_MESSAGE_REJECT>>");
#endif
if (sc->sc_flags & ESP_SYNCHNEGO) {
ti->period = ti->offset = 0;
sc->sc_flags &= ~ESP_SYNCHNEGO;
ti->flags &= ~T_NEGOTIATE;
}
/* Not all targets understand INITIATOR_DETECTED_ERR */
if (sc->sc_msgout == SEND_INIT_DET_ERR)
esp_sched_msgout(SEND_ABORT);
break;
case MSG_NOOP:
ESP_MSGS(("noop "));
break;
case MSG_DISCONNECT:
ESP_MSGS(("disconnect "));
ti->dconns++;
sc->sc_flags |= ESP_DISCON;
sc->sc_flags |= ESP_BUSFREE_OK;
#define SDEV_AUTOSAVE (0x01)
if ((ecb->xs->sc_link->quirks & SDEV_AUTOSAVE) == 0)
break;
/*FALLTHROUGH*/
case MSG_SAVEDATAPOINTER:
ESP_MSGS(("save datapointer "));
ecb->dleft = sc->sc_dleft;
ecb->daddr = sc->sc_dp;
break;
case MSG_RESTOREPOINTERS:
ESP_MSGS(("restore datapointer "));
if (!ecb) {
esp_sched_msgout(SEND_ABORT);
printf("%s: no DATAPOINTERs to restore\n",
device_get_nameunit(sc->sc_dev));
break;
}
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
break;
case MSG_PARITY_ERROR:
printf("%s:target%d: MSG_PARITY_ERROR\n",
device_get_nameunit(sc->sc_dev),
ecb->xs->sc_link->target);
break;
case MSG_EXTENDED:
ESP_MSGS(("extended(%x) ", sc->sc_imess[2]));
switch (sc->sc_imess[2]) {
case MSG_EXT_SDTR:
ESP_MSGS(("SDTR period %d, offset %d ",
sc->sc_imess[3], sc->sc_imess[4]));
ti->period = sc->sc_imess[3];
ti->offset = sc->sc_imess[4];
if (sc->sc_minsync == 0) {
/* We won't do synch */
ti->offset = 0;
esp_sched_msgout(SEND_SDTR);
} else if (ti->offset == 0) {
printf("%s:%d: async\n", "esp",
ecb->xs->sc_link->target);
ti->offset = 0;
sc->sc_flags &= ~ESP_SYNCHNEGO;
} else if (ti->period > 124) {
printf("%s:%d: async\n", "esp",
ecb->xs->sc_link->target);
ti->offset = 0;
esp_sched_msgout(SEND_SDTR);
} else {
int r = 250/ti->period;
int s = (100*250)/ti->period - 100*r;
int p;
p = esp_stp2cpb(sc, ti->period);
ti->period = esp_cpb2stp(sc, p);
#ifdef ESP_DEBUG
sc_print_addr(ecb->xs->sc_link);
#endif
if ((sc->sc_flags&ESP_SYNCHNEGO) == 0) {
/* Target initiated negotiation */
if (ti->flags & T_SYNCMODE) {
ti->flags &= ~T_SYNCMODE;
#ifdef ESP_DEBUG
printf("renegotiated ");
#endif
}
ESP_WRITE_REG(sc, ESP_SYNCOFF,
0);
ESP_WRITE_REG(sc, ESP_SYNCTP,
0);
/* Clamp to our maxima */
if (ti->period < sc->sc_minsync)
ti->period = sc->sc_minsync;
if (ti->offset > 15)
ti->offset = 15;
esp_sched_msgout(SEND_SDTR);
} else {
/* we are sync */
sc->sc_flags &= ~ESP_SYNCHNEGO;
ESP_WRITE_REG(sc, ESP_SYNCOFF,
ti->offset);
ESP_WRITE_REG(sc, ESP_SYNCTP,
p);
ti->flags |= T_SYNCMODE;
}
#ifdef ESP_DEBUG
printf("max sync rate %d.%02dMb/s\n",
r, s);
#endif
}
ti->flags &= ~T_NEGOTIATE;
break;
default: /* Extended messages we don't handle */
ESPCMD(sc, ESPCMD_SETATN);
break;
}
break;
default:
ESP_MSGS(("ident "));
/* thanks for that ident... */
if (!MSG_ISIDENTIFY(sc->sc_imess[0])) {
ESP_MISC(("unknown "));
printf("%s: unimplemented message: %d\n", device_get_nameunit(sc->sc_dev), sc->sc_imess[0]);
ESPCMD(sc, ESPCMD_SETATN);
}
break;
}
} else if (sc->sc_state == ESP_RESELECTED) {
struct scsi_link *sc_link = NULL;
struct ecb *ecb;
struct esp_tinfo *ti;
u_char lunit;
if (MSG_ISIDENTIFY(sc->sc_imess[0])) { /* Identify? */
ESP_MISC(("searching "));
/*
* 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.
*/
lunit = sc->sc_imess[0] & 0x07;
TAILQ_FOREACH(ecb, &sc->nexus_list, chain) {
sc_link = ecb->xs->sc_link;
if (sc_link->lun == lunit &&
sc->sc_selid == (1<<sc_link->target)) {
TAILQ_REMOVE(&sc->nexus_list, ecb,
chain);
ECB_SETQ(ecb, ECB_QNONE);
break;
}
}
if (!ecb) { /* Invalid reselection! */
esp_sched_msgout(SEND_ABORT);
printf("esp: invalid reselect (idbit=0x%2x)\n",
sc->sc_selid);
} else { /* Reestablish nexus */
/*
* Setup driver data structures and
* do an implicit RESTORE POINTERS
*/
ti = &sc->sc_tinfo[sc_link->target];
sc->sc_nexus = ecb;
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
sc->sc_tinfo[sc_link->target].lubusy
|= (1<<sc_link->lun);
if (ti->flags & T_SYNCMODE) {
ESP_WRITE_REG(sc, ESP_SYNCOFF,
ti->offset);
ESP_WRITE_REG(sc, ESP_SYNCTP,
esp_stp2cpb(sc, ti->period));
} else {
ESP_WRITE_REG(sc, ESP_SYNCOFF, 0);
ESP_WRITE_REG(sc, ESP_SYNCTP, 0);
}
ESP_MISC(("... found ecb"));
sc->sc_state = ESP_HASNEXUS;
}
} else {
printf("%s: bogus reselect (no IDENTIFY) %0x2x\n",
device_get_nameunit(sc->sc_dev), sc->sc_selid);
esp_sched_msgout(SEND_DEV_RESET);
}
} else { /* Neither ESP_HASNEXUS nor ESP_RESELECTED! */
printf("%s: unexpected message in; will send DEV_RESET\n",
device_get_nameunit(sc->sc_dev));
esp_sched_msgout(SEND_DEV_RESET);
}
/* Ack last message byte */
ESPCMD(sc, ESPCMD_MSGOK);
/* Done, reset message pointer. */
sc->sc_flags &= ~ESP_DROP_MSGI;
sc->sc_imlen = 0;
}
/*
* Send the highest priority, scheduled message
*/
void
esp_msgout(sc)
register struct esp_softc *sc;
{
struct esp_tinfo *ti;
struct ecb *ecb;
size_t size;
ESP_TRACE(("[esp_msgout(priq:%x, prevphase:%x)]", sc->sc_msgpriq, sc->sc_prevphase));
if (sc->sc_prevphase != MESSAGE_OUT_PHASE) {
/* Pick up highest priority message */
sc->sc_msgout = sc->sc_msgpriq & -sc->sc_msgpriq;
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;
break;
case SEND_IDENTIFY:
if (sc->sc_state != ESP_HASNEXUS) {
printf("esp at line %d: no nexus", __LINE__);
}
ecb = sc->sc_nexus;
sc->sc_omess[0] = MSG_IDENTIFY(ecb->xs->sc_link->lun,0);
break;
case SEND_DEV_RESET:
sc->sc_omess[0] = MSG_BUS_DEV_RESET;
sc->sc_flags |= ESP_BUSFREE_OK;
ecb = sc->sc_nexus;
ti = &sc->sc_tinfo[ecb->xs->sc_link->target];
ti->flags &= ~T_SYNCMODE;
ti->flags |= T_NEGOTIATE;
break;
case SEND_PARITY_ERROR:
sc->sc_omess[0] = MSG_PARITY_ERROR;
break;
case SEND_ABORT:
sc->sc_omess[0] = MSG_ABORT;
sc->sc_flags |= ESP_BUSFREE_OK;
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:
sc->sc_omess[0] = MSG_NOOP;
break;
}
sc->sc_omp = sc->sc_omess;
}
#if 1
/* (re)send the message */
size = min(sc->sc_omlen, sc->sc_maxxfer);
DMA_SETUP(sc->sc_dma, &sc->sc_omp, &sc->sc_omlen, 0, &size);
/* Program the SCSI counter */
ESP_WRITE_REG(sc, ESP_TCL, size);
ESP_WRITE_REG(sc, ESP_TCM, size >> 8);
if (sc->sc_cfg2 & ESPCFG2_FE) {
ESP_WRITE_REG(sc, ESP_TCH, size >> 16);
}
/* load the count in */
ESPCMD(sc, ESPCMD_NOP|ESPCMD_DMA);
ESPCMD(sc, (size==0?ESPCMD_TRPAD:ESPCMD_TRANS)|ESPCMD_DMA);
DMA_GO(sc->sc_dma);
#else
{ int i;
ESPCMD(sc, ESPCMD_FLUSH);
for (i = 0; i < sc->sc_omlen; i++)
ESP_WRITE_REG(sc, FIFO, sc->sc_omess[i]);
ESPCMD(sc, ESPCMD_TRANS);
#if test_stuck_on_msgout
printf("<<XXXmsgoutdoneXXX>>");
#endif
}
#endif
}
/*
* This is the most critical part of the driver, and has to know
* how to deal with *all* error conditions and phases from the SCSI
* bus. If there are no errors and the DMA was active, then call the
* DMA pseudo-interrupt handler. If this returns 1, then that was it
* and we can return from here without further processing.
*
* Most of this needs verifying.
*/
int
espintr(sc)
register struct esp_softc *sc;
{
register struct ecb *ecb;
register struct scsi_link *sc_link;
struct esp_tinfo *ti;
int loop;
size_t size;
ESP_TRACE(("[espintr]"));
/*
* I have made some (maybe seriously flawed) assumptions here,
* but basic testing (uncomment the printf() below), show that
* certainly something happens when this loop is here.
*
* The idea is that many of the SCSI operations take very little
* time, and going away and getting interrupted is too high an
* overhead to pay. For example, selecting, sending a message
* and command and then doing some work can be done in one "pass".
*
* The DELAY is not variable because I do not understand that the
* DELAY loop should be fixed-time regardless of CPU speed, but
* I am *assuming* that the faster SCSI processors get things done
* quicker (sending a command byte etc), and so there is no
* need to be too slow.
*
* This is a heuristic. It is 2 when at 20Mhz, 2 at 25Mhz and 1
* at 40Mhz. This needs testing.
*/
for (loop = 0; 1;loop++, DELAY(50/sc->sc_freq)) {
/* a feeling of deja-vu */
if (!DMA_ISINTR(sc->sc_dma))
return (loop != 0);
#if 0
if (loop)
printf("*");
#endif
/* and what do the registers say... */
espreadregs(sc);
sc->sc_intrcnt.ev_count++;
/*
* At the moment, only a SCSI Bus Reset or Illegal
* Command are classed as errors. A disconnect is a
* valid condition, and we let the code check is the
* "ESP_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 & ESPINTR_SBR) {
if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) {
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
}
if (sc->sc_state != ESP_SBR) {
printf("%s: SCSI bus reset\n",
device_get_nameunit(sc->sc_dev));
esp_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",
device_get_nameunit(sc->sc_dev));
sc->sc_state = ESP_IDLE;
esp_sched(sc);
return 1;
}
ecb = sc->sc_nexus;
#define ESPINTR_ERR (ESPINTR_SBR|ESPINTR_ILL)
if (sc->sc_espintr & ESPINTR_ERR ||
sc->sc_espstat & ESPSTAT_GE) {
if (sc->sc_espstat & ESPSTAT_GE) {
/* no target ? */
if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) {
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
}
if (sc->sc_state == ESP_HASNEXUS ||
sc->sc_state == ESP_SELECTING) {
ecb->xs->error = XS_DRIVER_STUFFUP;
esp_done(ecb);
}
return 1;
}
if (sc->sc_espintr & ESPINTR_ILL) {
/* illegal command, out of sync ? */
printf("%s: illegal command: 0x%x (state %d, phase %x, prevphase %x)\n",
device_get_nameunit(sc->sc_dev), sc->sc_lastcmd,
sc->sc_state, sc->sc_phase,
sc->sc_prevphase);
if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) {
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
}
esp_init(sc, 0); /* Restart everything */
return 1;
}
}
/*
* 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 (DMA_ISACTIVE(sc->sc_dma)) {
DMA_INTR(sc->sc_dma);
/* If DMA active here, then go back to work... */
if (DMA_ISACTIVE(sc->sc_dma))
return 1;
if (sc->sc_dleft == 0 &&
(sc->sc_espstat & ESPSTAT_TC) == 0)
printf("%s: !TC [intr %x, stat %x, step %d]"
" prevphase %x, resid %x\n",
device_get_nameunit(sc->sc_dev),
sc->sc_espintr,
sc->sc_espstat,
sc->sc_espstep,
sc->sc_prevphase,
ecb?ecb->dleft:-1);
}
#if 0 /* Unreliable on some ESP revisions? */
if ((sc->sc_espstat & ESPSTAT_INT) == 0) {
printf("%s: spurious interrupt\n", device_get_nameunit(sc->sc_dev));
return 1;
}
#endif
/*
* check for less serious errors
*/
if (sc->sc_espstat & ESPSTAT_PE) {
printf("%s: SCSI bus parity error\n",
device_get_nameunit(sc->sc_dev));
if (sc->sc_prevphase == MESSAGE_IN_PHASE)
esp_sched_msgout(SEND_PARITY_ERROR);
else
esp_sched_msgout(SEND_INIT_DET_ERR);
}
if (sc->sc_espintr & ESPINTR_DIS) {
ESP_MISC(("<DISC [intr %x, stat %x, step %d]>",
sc->sc_espintr,sc->sc_espstat,sc->sc_espstep));
if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) {
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
}
/*
* This command must (apparently) be issued within
* 250mS of a disconnect. So here you are...
*/
ESPCMD(sc, ESPCMD_ENSEL);
if (sc->sc_state != ESP_IDLE) {
if ((sc->sc_flags & ESP_SYNCHNEGO)) {
#ifdef ESP_DEBUG
if (ecb)
sc_print_addr(ecb->xs->sc_link);
printf("sync nego not completed!\n");
#endif
sc->sc_flags &= ~ESP_SYNCHNEGO;
sc->sc_tinfo[ecb->xs->sc_link->target].offset = 0;
sc->sc_tinfo[ecb->xs->sc_link->target].flags &= ~T_NEGOTIATE;
}
/*XXX*/sc->sc_msgpriq = sc->sc_msgout = 0;
/* it may be OK to disconnect */
if (!(sc->sc_flags & ESP_BUSFREE_OK)) {
if (sc->sc_state == ESP_HASNEXUS) {
sc_print_addr(ecb->xs->sc_link);
printf("disconnect without"
"warning\n");
}
ecb->xs->error = XS_TIMEOUT;
} else if (sc->sc_flags & ESP_DISCON) {
TAILQ_INSERT_HEAD(&sc->nexus_list, ecb, chain);
ECB_SETQ(ecb, ECB_QNEXUS);
sc->sc_nexus = NULL;
sc->sc_flags &= ~ESP_DISCON;
sc->sc_state = ESP_IDLE;
#if ESP_DEBUG
if ((esp_debug & 0x10000) && ecb->dleft == 0) {
printf("%s: silly disconnect (ecb %p [stat %x])\n",
device_get_nameunit(sc->sc_dev), ecb, ecb->stat);
}
#endif
esp_sched(sc);
return 1;
}
esp_done(ecb);
return 1;
}
printf("%s: DISCONNECT in IDLE state!\n",
device_get_nameunit(sc->sc_dev));
}
/* did a message go out OK ? This must be broken */
if (sc->sc_prevphase == MESSAGE_OUT_PHASE &&
sc->sc_phase != MESSAGE_OUT_PHASE) {
/* we have sent it */
if (sc->sc_msgout == SEND_SDTR &&
(sc->sc_flags & ESP_SYNCHNEGO) == 0) {
/* We've just accepted new sync parameters */
sc->sc_tinfo[ecb->xs->sc_link->target].flags |=
T_SYNCMODE;
if (ecb) sc_print_addr(ecb->xs->sc_link);else printf("NO nexus: ");
printf("target put in SYNC mode\n");
}
sc->sc_msgpriq &= ~sc->sc_msgout;
sc->sc_msgout = 0;
}
switch (sc->sc_state) {
case ESP_SBR:
printf("%s: waiting for SCSI Bus Reset to happen\n",
device_get_nameunit(sc->sc_dev));
return 1;
case ESP_RESELECTED:
/*
* we must be continuing a message ?
*/
if (sc->sc_phase != MESSAGE_IN_PHASE) {
printf("%s: target didn't identify\n",
device_get_nameunit(sc->sc_dev));
esp_init(sc, 1);
return 1;
}
printf("<<RESELECT CONT'd>>");
#if XXXX
esp_msgin(sc);
if (sc->sc_state != ESP_HASNEXUS) {
/* IDENTIFY fail?! */
printf("%s: identify failed\n",
device_get_nameunit(sc->sc_dev));
esp_init(sc, 1);
return 1;
}
#endif
break;
case ESP_IDLE:
if (sc->sc_flags & ESP_ICCS) printf("[[esp: BUMMER]]");
case ESP_SELECTING:
if (sc->sc_espintr & ESPINTR_RESEL) {
/*
* If we're trying to select a
* target ourselves, push our command
* back into the ready list.
*/
if (sc->sc_state == ESP_SELECTING) {
ESP_MISC(("backoff selector "));
sc_link = sc->sc_nexus->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
TAILQ_INSERT_HEAD(&sc->ready_list,
sc->sc_nexus, chain);
ECB_SETQ(sc->sc_nexus, ECB_QREADY);
ti->lubusy &= ~(1<<sc_link->lun);
ecb = sc->sc_nexus = NULL;
}
sc->sc_state = ESP_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",
device_get_nameunit(sc->sc_dev));
esp_init(sc, 1);
return 1;
}
if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) != 2) {
printf("%s: RESELECT: %d bytes in FIFO!\n",
device_get_nameunit(sc->sc_dev),
ESP_READ_REG(sc, ESP_FFLAG) &
ESPFIFO_FF);
esp_init(sc, 1);
return 1;
}
sc->sc_selid = ESP_READ_REG(sc, ESP_FIFO);
sc->sc_selid &= ~(1<<sc->sc_id);
ESP_MISC(("selid=0x%2x ", sc->sc_selid));
esp_msgin(sc); /* Handle identify message */
if (sc->sc_state != ESP_HASNEXUS) {
/* IDENTIFY fail?! */
printf("%s: identify failed\n",
device_get_nameunit(sc->sc_dev));
esp_init(sc, 1);
return 1;
}
continue; /* ie. next phase expected soon */
}
#define ESPINTR_DONE (ESPINTR_FC|ESPINTR_BS)
if ((sc->sc_espintr & ESPINTR_DONE) == ESPINTR_DONE) {
ecb = sc->sc_nexus;
if (!ecb)
panic("esp: not nexus at sc->sc_nexus");
sc_link = ecb->xs->sc_link;
ti = &sc->sc_tinfo[sc_link->target];
switch (sc->sc_espstep) {
case 0:
printf("%s: select timeout/no disconnect\n",
device_get_nameunit(sc->sc_dev));
esp_abort(sc, ecb);
return 1;
case 1:
if ((ti->flags & T_NEGOTIATE) == 0) {
printf("%s: step 1 & !NEG\n",
device_get_nameunit(sc->sc_dev));
esp_abort(sc, ecb);
return 1;
}
if (sc->sc_phase != MESSAGE_OUT_PHASE) {
printf("%s: !MSGOUT\n",
device_get_nameunit(sc->sc_dev));
esp_abort(sc, ecb);
return 1;
}
/* Start negotiating */
ti->period = sc->sc_minsync;
ti->offset = 15;
sc->sc_msgpriq = SEND_SDTR;
sc->sc_flags |= ESP_SYNCHNEGO;
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 ((ESP_READ_REG(sc, ESP_FFLAG)&ESPFIFO_FF) == 0) {
/* Hope for the best.. */
break;
}
printf("(%s:%d:%d): selection failed;"
" %d left in FIFO "
"[intr %x, stat %x, step %d]\n",
device_get_nameunit(sc->sc_dev),
sc_link->target,
sc_link->lun,
ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
ESPCMD(sc, ESPCMD_FLUSH);
sc->sc_flags |= ESP_ABORTING;
esp_sched_msgout(SEND_ABORT);
return 1;
case 2:
/* Select stuck at Command Phase */
ESPCMD(sc, ESPCMD_FLUSH);
case 4:
/* So far, everything went fine */
sc->sc_msgpriq = 0;
break;
}
#if 0
/* Why set msgpriq? (and not raise ATN) */
if (ecb->xs->flags & SCSI_RESET)
sc->sc_msgpriq = SEND_DEV_RESET;
else if (ti->flags & T_NEGOTIATE)
sc->sc_msgpriq =
SEND_IDENTIFY | SEND_SDTR;
else
sc->sc_msgpriq = SEND_IDENTIFY;
#endif
sc->sc_state = ESP_HASNEXUS;
/*???sc->sc_flags = 0; */
sc->sc_prevphase = INVALID_PHASE; /* ?? */
sc->sc_dp = ecb->daddr;
sc->sc_dleft = ecb->dleft;
ti->lubusy |= (1<<sc_link->lun);
break;
} else {
printf("%s: unexpected status after select"
": [intr %x, stat %x, step %x]\n",
device_get_nameunit(sc->sc_dev),
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
esp_abort(sc, ecb);
}
if (sc->sc_state == ESP_IDLE) {
printf("%s: stray interrupt\n",
device_get_nameunit(sc->sc_dev));
return 0;
}
break;
case ESP_HASNEXUS:
if (sc->sc_flags & ESP_ICCS) {
unsigned char msg;
sc->sc_flags &= ~ESP_ICCS;
if (!(sc->sc_espintr & ESPINTR_DONE)) {
printf("%s: ICCS: "
": [intr %x, stat %x, step %x]\n",
device_get_nameunit(sc->sc_dev),
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) != 2) {
printf("%s: ICCS: expected 2, got %d "
": [intr %x, stat %x, step %x]\n",
device_get_nameunit(sc->sc_dev),
ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF,
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
ESPCMD(sc, ESPCMD_FLUSH);
esp_abort(sc, ecb);
return 1;
}
ecb->stat = ESP_READ_REG(sc, ESP_FIFO);
msg = ESP_READ_REG(sc, ESP_FIFO);
ESP_PHASE(("<stat:(%x,%x)>", ecb->stat, msg));
if (msg == MSG_CMDCOMPLETE) {
sc->sc_flags |= ESP_BUSFREE_OK;
ecb->xs->resid = ecb->dleft = sc->sc_dleft;
} else
printf("%s: STATUS_PHASE: msg %d\n",
device_get_nameunit(sc->sc_dev), msg);
ESPCMD(sc, ESPCMD_MSGOK);
continue; /* ie. wait for disconnect */
}
break;
default:
panic("%s: invalid state: %d",
device_get_nameunit(sc->sc_dev), sc->sc_state);
}
/*
* Driver is now in state ESP_HASNEXUS, i.e. we
* have a current command working the SCSI bus.
*/
if (sc->sc_state != ESP_HASNEXUS || ecb == NULL) {
panic("esp no nexus");
}
switch (sc->sc_phase) {
case MESSAGE_OUT_PHASE:
ESP_PHASE(("MESSAGE_OUT_PHASE "));
esp_msgout(sc);
sc->sc_prevphase = MESSAGE_OUT_PHASE;
break;
case MESSAGE_IN_PHASE:
ESP_PHASE(("MESSAGE_IN_PHASE "));
if (sc->sc_espintr & ESPINTR_BS) {
ESPCMD(sc, ESPCMD_FLUSH);
sc->sc_flags |= ESP_WAITI;
ESPCMD(sc, ESPCMD_TRANS);
} else if (sc->sc_espintr & ESPINTR_FC) {
if ((sc->sc_flags & ESP_WAITI) == 0) {
printf("%s: MSGIN: unexpected FC bit: "
"[intr %x, stat %x, step %x]\n",
device_get_nameunit(sc->sc_dev),
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
sc->sc_flags &= ~ESP_WAITI;
esp_msgin(sc);
} else {
printf("%s: MSGIN: weird bits: "
"[intr %x, stat %x, step %x]\n",
device_get_nameunit(sc->sc_dev),
sc->sc_espintr, sc->sc_espstat,
sc->sc_espstep);
}
sc->sc_prevphase = MESSAGE_IN_PHASE;
break;
case COMMAND_PHASE: {
/* well, this means send the command again */
u_char *cmd = (u_char *)&ecb->cmd;
int i;
ESP_PHASE(("COMMAND_PHASE 0x%02x (%d) ",
ecb->cmd.opcode, ecb->clen));
if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) {
ESPCMD(sc, ESPCMD_FLUSH);
DELAY(1);
}
/* Now the command into the FIFO */
for (i = 0; i < ecb->clen; i++)
ESP_WRITE_REG(sc, ESP_FIFO, *cmd++);
ESPCMD(sc, ESPCMD_TRANS);
sc->sc_prevphase = COMMAND_PHASE;
}
break;
case DATA_OUT_PHASE:
ESP_PHASE(("DATA_OUT_PHASE [%d] ", sc->sc_dleft));
ESPCMD(sc, ESPCMD_FLUSH);
size = min(sc->sc_dleft, sc->sc_maxxfer);
DMA_SETUP(sc->sc_dma, &sc->sc_dp, &sc->sc_dleft,
0, &size);
sc->sc_prevphase = DATA_OUT_PHASE;
goto setup_xfer;
case DATA_IN_PHASE:
ESP_PHASE(("DATA_IN_PHASE "));
if (sc->sc_rev == ESP100)
ESPCMD(sc, ESPCMD_FLUSH);
size = min(sc->sc_dleft, sc->sc_maxxfer);
DMA_SETUP(sc->sc_dma, &sc->sc_dp, &sc->sc_dleft,
1, &size);
sc->sc_prevphase = DATA_IN_PHASE;
setup_xfer:
/* Program the SCSI counter */
ESP_WRITE_REG(sc, ESP_TCL, size);
ESP_WRITE_REG(sc, ESP_TCM, size >> 8);
if (sc->sc_cfg2 & ESPCFG2_FE) {
ESP_WRITE_REG(sc, ESP_TCH, size >> 16);
}
/* load the count in */
ESPCMD(sc, ESPCMD_NOP|ESPCMD_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.
*/
ESPCMD(sc,
(size==0?ESPCMD_TRPAD:ESPCMD_TRANS)|ESPCMD_DMA);
DMA_GO(sc->sc_dma);
return 1;
case STATUS_PHASE:
ESP_PHASE(("STATUS_PHASE "));
sc->sc_flags |= ESP_ICCS;
ESPCMD(sc, ESPCMD_ICCS);
sc->sc_prevphase = STATUS_PHASE;
break;
case INVALID_PHASE:
break;
case BUSFREE_PHASE:
if (sc->sc_flags & ESP_BUSFREE_OK) {
/*It's fun the 1st time.. */
sc->sc_flags &= ~ESP_BUSFREE_OK;
}
break;
default:
panic("esp: bogus bus phase\n");
}
}
panic("esp: should not get here..");
}
void
esp_abort(sc, ecb)
struct esp_softc *sc;
struct ecb *ecb;
{
if (ecb == sc->sc_nexus) {
if (sc->sc_state == ESP_HASNEXUS) {
sc->sc_flags |= ESP_ABORTING;
esp_sched_msgout(SEND_ABORT);
}
} else {
if (sc->sc_state == ESP_IDLE)
esp_sched(sc);
}
}
void
esp_timeout(arg)
void *arg;
{
int s = splbio();
struct ecb *ecb = (struct ecb *)arg;
struct esp_softc *sc;
struct scsi_xfer *xs = ecb->xs;
sc = xs->sc_link->adapter_softc;
sc_print_addr(xs->sc_link);
again:
printf("%s: timed out [ecb %p (flags 0x%x, dleft %x, stat %x)], "
"<state %d, nexus %p, phase(c %x, p %x), resid %x, msg(q %x,o %x) %s>",
device_get_nameunit(sc->sc_dev),
ecb, ecb->flags, ecb->dleft, ecb->stat,
sc->sc_state, sc->sc_nexus, sc->sc_phase, sc->sc_prevphase,
sc->sc_dleft, sc->sc_msgpriq, sc->sc_msgout,
DMA_ISACTIVE(sc->sc_dma) ? "DMA active" : "");
#if ESP_DEBUG > 0
printf("TRACE: %s.", ecb->trace);
#endif
if (ecb->flags & ECB_ABORTED) {
/* abort timed out */
printf(" AGAIN\n");
esp_init(sc, 1);
} else {
/* abort the operation that has timed out */
printf("\n");
xs->error = XS_TIMEOUT;
ecb->flags |= ECB_ABORTED;
esp_abort(sc, ecb);
/* 2 secs for the abort */
if ((xs->flags & SCSI_NOMASK) == 0)
timeout(esp_timeout, ecb, 2 * hz);
else {
int count = 200000;
while (count) {
if (DMA_ISINTR(sc->sc_dma)) {
espintr(sc);
}
if (xs->flags & ITSDONE)
break;
DELAY(10);
--count;
}
if (count == 0)
goto again;
}
}
splx(s);
}
static void
esp_min_phys (struct buf *bp)
{
}
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