Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/arch/hp300/dev/scsi.c

1532 lines
36 KiB
C
Raw Blame History

/* $NetBSD: scsi.c,v 1.15 1997/01/30 09:08:55 thorpej Exp $ */
/*
* Copyright (c) 1996, 1997 Jason R. Thorpe. All rights reserved.
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson of Lawrence Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)scsi.c 8.2 (Berkeley) 1/12/94
*/
#ifndef DEBUG
#define DEBUG
#endif
/*
* HP9000/3xx 98658 SCSI host adaptor driver.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <hp300/dev/dioreg.h>
#include <hp300/dev/diovar.h>
#include <hp300/dev/diodevs.h>
#include <hp300/dev/dmavar.h>
#include <hp300/dev/scsivar.h>
#include <hp300/dev/scsireg.h>
#include <hp300/hp300/isr.h>
struct scsi_softc {
struct device sc_dev; /* generic device glue */
volatile struct scsidevice *sc_regs; /* card registers */
struct dmaqueue sc_dq; /* our entry in DMA job queue */
TAILQ_HEAD(, scsiqueue) sc_queue; /* job queue */
u_char sc_flags;
u_char sc_sync;
u_char sc_scsi_addr;
u_char sc_scsiid; /* XXX unencoded copy of sc_scsi_addr */
u_char sc_stat[2];
u_char sc_msg[7];
};
/* sc_flags */
#define SCSI_IO 0x80 /* DMA I/O in progress */
#define SCSI_DMA32 0x40 /* 32-bit DMA should be used */
#define SCSI_HAVEDMA 0x04 /* controller has DMA channel */
#ifdef DEBUG
#define SCSI_PAD 0x02 /* 'padded' transfer in progress */
#endif
#define SCSI_ALIVE 0x01 /* controller initialized */
/*
* SCSI delays
* In u-seconds, primarily for state changes on the SPC.
*/
#define SCSI_CMD_WAIT 10000 /* wait per step of 'immediate' cmds */
#define SCSI_DATA_WAIT 10000 /* wait per data in/out step */
#define SCSI_INIT_WAIT 50000 /* wait per step (both) during init */
void scsidone __P((void *));
void scsistart __P((void *));
int scsiintr __P((void *));
int scsimatch __P((struct device *, struct cfdata *, void *));
void scsiattach __P((struct device *, struct device *, void *));
struct cfattach oscsi_ca = {
sizeof(struct scsi_softc), scsimatch, scsiattach
};
struct cfdriver oscsi_cd = {
NULL, "oscsi", DV_DULL
};
int scsisubmatch __P((struct device *, struct cfdata *, void *));
void scsi_attach_children __P((struct scsi_softc *));
int scsi_cmd_wait = SCSI_CMD_WAIT;
int scsi_data_wait = SCSI_DATA_WAIT;
int scsi_init_wait = SCSI_INIT_WAIT;
int scsi_nosync = 1; /* inhibit sync xfers if 1 */
int scsi_pridma = 0; /* use "priority" dma */
#ifdef DEBUG
int scsi_debug = 0;
#define WAITHIST
#endif
#ifdef WAITHIST
#define MAXWAIT 1022
u_int ixstart_wait[MAXWAIT+2];
u_int ixin_wait[MAXWAIT+2];
u_int ixout_wait[MAXWAIT+2];
u_int mxin_wait[MAXWAIT+2];
u_int mxin2_wait[MAXWAIT+2];
u_int cxin_wait[MAXWAIT+2];
u_int fxfr_wait[MAXWAIT+2];
u_int sgo_wait[MAXWAIT+2];
#define HIST(h,w) (++h[((w)>MAXWAIT? MAXWAIT : ((w) < 0 ? -1 : (w))) + 1]);
#else
#define HIST(h,w)
#endif
#define b_cylin b_resid
static void
scsiabort(target, hs, hd, where)
int target;
register struct scsi_softc *hs;
volatile register struct scsidevice *hd;
char *where;
{
int len;
int maxtries; /* XXX - kludge till I understand whats *supposed* to happen */
int startlen; /* XXX - kludge till I understand whats *supposed* to happen */
u_char junk;
printf("%s: ", hs->sc_dev.dv_xname);
if (target != -1)
printf("targ %d ", target);
printf("abort from %s: phase=0x%x, ssts=0x%x, ints=0x%x\n",
where, hd->scsi_psns, hd->scsi_ssts, hd->scsi_ints);
hd->scsi_ints = hd->scsi_ints;
hd->scsi_csr = 0;
if (hd->scsi_psns == 0 || (hd->scsi_ssts & SSTS_INITIATOR) == 0)
/* no longer connected to scsi target */
return;
/* get the number of bytes remaining in current xfer + fudge */
len = (hd->scsi_tch << 16) | (hd->scsi_tcm << 8) | hd->scsi_tcl;
/* for that many bus cycles, try to send an abort msg */
for (startlen = (len += 1024); (hd->scsi_ssts & SSTS_INITIATOR) && --len >= 0; ) {
hd->scsi_scmd = SCMD_SET_ATN;
maxtries = 1000;
while ((hd->scsi_psns & PSNS_REQ) == 0) {
if (! (hd->scsi_ssts & SSTS_INITIATOR))
goto out;
DELAY(1);
if (--maxtries == 0) {
printf("-- scsiabort gave up after 1000 tries (startlen = %d len = %d)\n",
startlen, len);
goto out2;
}
}
out2:
if ((hd->scsi_psns & PHASE) == MESG_OUT_PHASE)
hd->scsi_scmd = SCMD_RST_ATN;
hd->scsi_pctl = hd->scsi_psns & PHASE;
if (hd->scsi_psns & PHASE_IO) {
/* one of the input phases - read & discard a byte */
hd->scsi_scmd = SCMD_SET_ACK;
if (hd->scsi_tmod == 0)
while (hd->scsi_psns & PSNS_REQ)
DELAY(1);
junk = hd->scsi_temp;
} else {
/* one of the output phases - send an abort msg */
hd->scsi_temp = MSG_ABORT;
hd->scsi_scmd = SCMD_SET_ACK;
if (hd->scsi_tmod == 0)
while (hd->scsi_psns & PSNS_REQ)
DELAY(1);
}
hd->scsi_scmd = SCMD_RST_ACK;
}
out:
/*
* Either the abort was successful & the bus is disconnected or
* the device didn't listen. If the latter, announce the problem.
* Either way, reset the card & the SPC.
*/
if (len < 0 && hs)
printf("%s: abort failed. phase=0x%x, ssts=0x%x\n",
hs->sc_dev.dv_xname, hd->scsi_psns, hd->scsi_ssts);
if (! ((junk = hd->scsi_ints) & INTS_RESEL)) {
hd->scsi_sctl |= SCTL_CTRLRST;
DELAY(2);
hd->scsi_sctl &=~ SCTL_CTRLRST;
hd->scsi_hconf = 0;
hd->scsi_ints = hd->scsi_ints;
}
}
/*
* XXX Set/reset long delays.
*
* if delay == 0, reset default delays
* if delay < 0, set both delays to default long initialization values
* if delay > 0, set both delays to this value
*
* Used when a devices is expected to respond slowly (e.g. during
* initialization).
*/
void
scsi_delay(delay)
int delay;
{
static int saved_cmd_wait, saved_data_wait;
if (delay) {
saved_cmd_wait = scsi_cmd_wait;
saved_data_wait = scsi_data_wait;
if (delay > 0)
scsi_cmd_wait = scsi_data_wait = delay;
else
scsi_cmd_wait = scsi_data_wait = scsi_init_wait;
} else {
scsi_cmd_wait = saved_cmd_wait;
scsi_data_wait = saved_data_wait;
}
}
int
scsimatch(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct dio_attach_args *da = aux;
switch (da->da_id) {
case DIO_DEVICE_ID_SCSI0:
case DIO_DEVICE_ID_SCSI1:
case DIO_DEVICE_ID_SCSI2:
case DIO_DEVICE_ID_SCSI3:
return (1);
}
return (0);
}
void
scsiattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct scsi_softc *hs = (struct scsi_softc *)self;
struct dio_attach_args *da = aux;
struct scsidevice *hd;
int ipl, unit = self->dv_unit;
/*
* Set up DMA job queue entry.
*/
hs->sc_dq.dq_softc = hs;
hs->sc_dq.dq_start = scsistart;
hs->sc_dq.dq_done = scsidone;
/* Initialize request queue. */
TAILQ_INIT(&hs->sc_queue);
/* Map the device. */
hd = (struct scsidevice *)iomap(dio_scodetopa(da->da_scode),
da->da_size);
if (hd == NULL) {
printf("\n%s: can't map registers\n", self->dv_xname);
return;
}
ipl = DIO_IPL(hd);
hs->sc_regs = hd;
/* Establish the interrupt handler. */
(void) isrlink(scsiintr, hs, ipl, ISRPRI_BIO);
dmacomputeipl();
/* Reset the controller. */
scsireset(unit);
/*
* Print information about what we've found.
*/
printf(":");
if (hs->sc_flags & SCSI_DMA32)
printf(" 32 bit dma, ");
switch (hs->sc_sync) {
case 0:
printf("async");
break;
case (TMOD_SYNC | 0x3e):
printf("250ns sync");
break;
case (TMOD_SYNC | 0x5e):
printf("375ns sync");
break;
case (TMOD_SYNC | 0x7d):
printf("500ns sync");
break;
default:
panic("scsiattach: unknown sync param 0x%x", hs->sc_sync);
}
if ((hd->scsi_hconf & HCONF_PARITY) == 0)
printf(", no parity");
printf(", scsi id %d\n", hs->sc_scsiid);
/*
* XXX scale initialization wait according to CPU speed.
* Should we do this for all wait? Should we do this at all?
*/
scsi_init_wait *= (cpuspeed / 8);
/*
* Find and attach devices on the SCSI bus.
*/
scsi_attach_children(hs);
}
void
scsi_attach_children(sc)
struct scsi_softc *sc;
{
struct oscsi_attach_args osa;
struct scsi_inquiry inqbuf;
int target, lun;
/*
* Look for devices on the SCSI bus.
*/
for (target = 0; target < 8; target++) {
/* Skip target used by controller. */
if (target == sc->sc_scsiid)
continue;
for (lun = 0; lun < 1 /* XXX */; lun++) {
bzero(&inqbuf, sizeof(inqbuf));
if (scsi_probe_device(sc->sc_dev.dv_unit,
target, lun, &inqbuf, sizeof(inqbuf))) {
/*
* XXX First command on some tapes
* XXX always fails. (Or, at least,
* XXX that's what the old Utah "st"
* XXX driver claimed.)
*/
bzero(&inqbuf, sizeof(inqbuf));
if (scsi_probe_device(sc->sc_dev.dv_unit,
target, lun, &inqbuf, sizeof(inqbuf)))
continue;
}
/*
* There is a device here; find a driver
* to match it.
*/
osa.osa_target = target;
osa.osa_lun = lun;
osa.osa_inqbuf = &inqbuf;
(void)config_found_sm(&sc->sc_dev, &osa,
scsi_print, scsisubmatch);
}
}
}
int
scsisubmatch(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct oscsi_attach_args *osa = aux;
if (match->cf_loc[0] != -1 &&
match->cf_loc[0] != osa->osa_target)
return (0);
if (match->cf_loc[1] != -1 &&
match->cf_loc[1] != osa->osa_lun)
return (0);
return ((*match->cf_attach->ca_match)(parent, match, aux));
}
int
scsi_print(aux, pnp)
void *aux;
const char *pnp;
{
struct oscsi_attach_args *osa = aux;
struct scsi_inquiry *inqbuf = osa->osa_inqbuf;
char vendor[9], product[17], revision[5];
if (pnp == NULL)
printf(" targ %d lun %d: ", osa->osa_target, osa->osa_lun);
bzero(vendor, sizeof(vendor));
bzero(product, sizeof(product));
bzero(revision, sizeof(revision));
switch (inqbuf->version) {
case 1:
case 2:
scsi_str(inqbuf->vendor_id, vendor, sizeof(inqbuf->vendor_id));
scsi_str(inqbuf->product_id, product,
sizeof(inqbuf->product_id));
scsi_str(inqbuf->rev, revision, sizeof(inqbuf->rev));
printf("<%s, %s, %s>", vendor, product, revision);
if (inqbuf->version == 2)
printf(" (SCSI-2)");
break;
default:
printf("type 0x%x, qual 0x%x, ver %d",
inqbuf->type, inqbuf->qual, inqbuf->version);
}
if (pnp != NULL)
printf(" at %s targ %d lun %d",
pnp, osa->osa_target, osa->osa_lun);
return (UNCONF);
}
void
scsireset(unit)
int unit;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[unit];
volatile register struct scsidevice *hd = hs->sc_regs;
u_int i;
if (hs->sc_flags & SCSI_ALIVE)
scsiabort(-1, hs, hd, "reset");
hd->scsi_id = 0xFF;
DELAY(100);
/*
* Disable interrupts then reset the FUJI chip.
*/
hd->scsi_csr = 0;
hd->scsi_sctl = SCTL_DISABLE | SCTL_CTRLRST;
hd->scsi_scmd = 0;
hd->scsi_tmod = 0;
hd->scsi_pctl = 0;
hd->scsi_temp = 0;
hd->scsi_tch = 0;
hd->scsi_tcm = 0;
hd->scsi_tcl = 0;
hd->scsi_ints = 0;
if ((hd->scsi_id & ID_WORD_DMA) == 0)
hs->sc_flags |= SCSI_DMA32;
/* Determine Max Synchronous Transfer Rate */
if (scsi_nosync)
i = 3;
else
i = SCSI_SYNC_XFER(hd->scsi_hconf);
switch (i) {
case 0:
hs->sc_sync = TMOD_SYNC | 0x3e; /* 250 nsecs */
break;
case 1:
hs->sc_sync = TMOD_SYNC | 0x5e; /* 375 nsecs */
break;
case 2:
hs->sc_sync = TMOD_SYNC | 0x7d; /* 500 nsecs */
break;
case 3:
hs->sc_sync = 0;
break;
}
/*
* Configure the FUJI chip with its SCSI address, all
* interrupts enabled & appropriate parity.
*/
i = (~hd->scsi_hconf) & 0x7;
hs->sc_scsi_addr = 1 << i;
hd->scsi_bdid = i;
hs->sc_scsiid = i;
if (hd->scsi_hconf & HCONF_PARITY)
hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
SCTL_INTR_ENAB | SCTL_PARITY_ENAB;
else
hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
SCTL_INTR_ENAB;
hd->scsi_sctl &=~ SCTL_DISABLE;
hs->sc_flags |= SCSI_ALIVE;
}
static void
scsierror(hs, hd, ints)
register struct scsi_softc *hs;
volatile register struct scsidevice *hd;
u_char ints;
{
int unit = hs->sc_dev.dv_unit;
char *sep = "";
printf("%s: ", hs->sc_dev.dv_xname);
if (ints & INTS_RST) {
DELAY(100);
if (hd->scsi_hconf & HCONF_SD)
printf("spurious RST interrupt");
else
printf("hardware error - check fuse");
sep = ", ";
}
if ((ints & INTS_HARD_ERR) || hd->scsi_serr) {
if (hd->scsi_serr & SERR_SCSI_PAR) {
printf("%sparity err", sep);
sep = ", ";
}
if (hd->scsi_serr & SERR_SPC_PAR) {
printf("%sSPC parity err", sep);
sep = ", ";
}
if (hd->scsi_serr & SERR_TC_PAR) {
printf("%sTC parity err", sep);
sep = ", ";
}
if (hd->scsi_serr & SERR_PHASE_ERR) {
printf("%sphase err", sep);
sep = ", ";
}
if (hd->scsi_serr & SERR_SHORT_XFR) {
printf("%ssync short transfer err", sep);
sep = ", ";
}
if (hd->scsi_serr & SERR_OFFSET) {
printf("%ssync offset error", sep);
sep = ", ";
}
}
if (ints & INTS_TIMEOUT)
printf("%sSPC select timeout error", sep);
if (ints & INTS_SRV_REQ)
printf("%sspurious SRV_REQ interrupt", sep);
if (ints & INTS_CMD_DONE)
printf("%sspurious CMD_DONE interrupt", sep);
if (ints & INTS_DISCON)
printf("%sspurious disconnect interrupt", sep);
if (ints & INTS_RESEL)
printf("%sspurious reselect interrupt", sep);
if (ints & INTS_SEL)
printf("%sspurious select interrupt", sep);
printf("\n");
}
static int
issue_select(hd, target, our_addr)
volatile register struct scsidevice *hd;
u_char target, our_addr;
{
if (hd->scsi_ssts & (SSTS_INITIATOR|SSTS_TARGET|SSTS_BUSY))
return (1);
if (hd->scsi_ints & INTS_DISCON)
hd->scsi_ints = INTS_DISCON;
hd->scsi_pctl = 0;
hd->scsi_temp = (1 << target) | our_addr;
/* select timeout is hardcoded to 2ms */
hd->scsi_tch = 0;
hd->scsi_tcm = 32;
hd->scsi_tcl = 4;
hd->scsi_scmd = SCMD_SELECT;
return (0);
}
static int
wait_for_select(hd)
volatile register struct scsidevice *hd;
{
u_char ints;
while ((ints = hd->scsi_ints) == 0)
DELAY(1);
hd->scsi_ints = ints;
return (!(hd->scsi_ssts & SSTS_INITIATOR));
}
static int
ixfer_start(hd, len, phase, wait)
volatile register struct scsidevice *hd;
int len;
u_char phase;
register int wait;
{
hd->scsi_tch = len >> 16;
hd->scsi_tcm = len >> 8;
hd->scsi_tcl = len;
hd->scsi_pctl = phase;
hd->scsi_tmod = 0; /*XXX*/
hd->scsi_scmd = SCMD_XFR | SCMD_PROG_XFR;
/* wait for xfer to start or svc_req interrupt */
while ((hd->scsi_ssts & SSTS_BUSY) == 0) {
if (hd->scsi_ints || --wait < 0) {
#ifdef DEBUG
if (scsi_debug)
printf("ixfer_start fail: i%x, w%d\n",
hd->scsi_ints, wait);
#endif
HIST(ixstart_wait, wait)
return (0);
}
DELAY(1);
}
HIST(ixstart_wait, wait)
return (1);
}
static int
ixfer_out(hd, len, buf)
volatile register struct scsidevice *hd;
int len;
register u_char *buf;
{
register int wait = scsi_data_wait;
for (; len > 0; --len) {
while (hd->scsi_ssts & SSTS_DREG_FULL) {
if (hd->scsi_ints || --wait < 0) {
#ifdef DEBUG
if (scsi_debug)
printf("ixfer_out fail: l%d i%x w%d\n",
len, hd->scsi_ints, wait);
#endif
HIST(ixout_wait, wait)
return (len);
}
DELAY(1);
}
hd->scsi_dreg = *buf++;
}
HIST(ixout_wait, wait)
return (0);
}
static void
ixfer_in(hd, len, buf)
volatile register struct scsidevice *hd;
int len;
register u_char *buf;
{
register int wait = scsi_data_wait;
for (; len > 0; --len) {
while (hd->scsi_ssts & SSTS_DREG_EMPTY) {
if (hd->scsi_ints || --wait < 0) {
while (! (hd->scsi_ssts & SSTS_DREG_EMPTY)) {
*buf++ = hd->scsi_dreg;
--len;
}
#ifdef DEBUG
if (scsi_debug)
printf("ixfer_in fail: l%d i%x w%d\n",
len, hd->scsi_ints, wait);
#endif
HIST(ixin_wait, wait)
return;
}
DELAY(1);
}
*buf++ = hd->scsi_dreg;
}
HIST(ixin_wait, wait)
}
static int
mxfer_in(hd, len, buf, phase)
volatile register struct scsidevice *hd;
register int len;
register u_char *buf;
register u_char phase;
{
register int wait = scsi_cmd_wait;
register int i;
hd->scsi_tmod = 0;
for (i = 0; i < len; ++i) {
/*
* manual sez: reset ATN before ACK is sent.
*/
if (hd->scsi_psns & PSNS_ATN)
hd->scsi_scmd = SCMD_RST_ATN;
/*
* wait for the request line (which says the target
* wants to give us data). If the phase changes while
* we're waiting, we're done.
*/
while ((hd->scsi_psns & PSNS_REQ) == 0) {
if (--wait < 0) {
HIST(mxin_wait, wait)
return (-1);
}
if ((hd->scsi_psns & PHASE) != phase ||
(hd->scsi_ssts & SSTS_INITIATOR) == 0)
goto out;
DELAY(1);
}
/*
* set ack (which says we're ready for the data, wait for
* req to go away (target says data is available), grab the
* data, then reset ack (say we've got the data).
*/
hd->scsi_pctl = phase;
hd->scsi_scmd = SCMD_SET_ACK;
while (hd->scsi_psns & PSNS_REQ) {
if (--wait < 0) {
HIST(mxin_wait, wait)
return (-2);
}
DELAY(1);
}
*buf++ = hd->scsi_temp;
hd->scsi_scmd = SCMD_RST_ACK;
}
out:
HIST(mxin_wait, wait)
/*
* Wait for manual transfer to finish.
* Avoids occasional "unexpected phase" errors in finishxfer
* formerly addressed by per-slave delays.
*/
wait = scsi_cmd_wait;
while ((hd->scsi_ssts & SSTS_ACTIVE) == SSTS_INITIATOR) {
if (--wait < 0)
break;
DELAY(1);
}
HIST(mxin2_wait, wait)
return (i);
}
/*
* SCSI 'immediate' command: issue a command to some SCSI device
* and get back an 'immediate' response (i.e., do programmed xfer
* to get the response data). 'cbuf' is a buffer containing a scsi
* command of length clen bytes. 'buf' is a buffer of length 'len'
* bytes for data. The transfer direction is determined by the device
* (i.e., by the scsi bus data xfer phase). If 'len' is zero, the
* command must supply no data. 'xferphase' is the bus phase the
* caller expects to happen after the command is issued. It should
* be one of DATA_IN_PHASE, DATA_OUT_PHASE or STATUS_PHASE.
*/
static int
scsiicmd(hs, target, cbuf, clen, buf, len, xferphase)
struct scsi_softc *hs;
int target;
u_char *cbuf;
int clen;
u_char *buf;
int len;
u_char xferphase;
{
volatile register struct scsidevice *hd = hs->sc_regs;
u_char phase, ints;
register int wait;
/* select the SCSI bus (it's an error if bus isn't free) */
if (issue_select(hd, target, hs->sc_scsi_addr))
return (-1);
if (wait_for_select(hd))
return (-1);
/*
* Wait for a phase change (or error) then let the device
* sequence us through the various SCSI phases.
*/
hs->sc_stat[0] = 0xff;
hs->sc_msg[0] = 0xff;
phase = CMD_PHASE;
while (1) {
wait = scsi_cmd_wait;
switch (phase) {
case CMD_PHASE:
if (ixfer_start(hd, clen, phase, wait))
if (ixfer_out(hd, clen, cbuf))
goto abort;
phase = xferphase;
break;
case DATA_IN_PHASE:
if (len <= 0)
goto abort;
wait = scsi_data_wait;
if (ixfer_start(hd, len, phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY))
ixfer_in(hd, len, buf);
phase = STATUS_PHASE;
break;
case DATA_OUT_PHASE:
if (len <= 0)
goto abort;
wait = scsi_data_wait;
if (ixfer_start(hd, len, phase, wait)) {
if (ixfer_out(hd, len, buf))
goto abort;
}
phase = STATUS_PHASE;
break;
case STATUS_PHASE:
wait = scsi_data_wait;
if (ixfer_start(hd, sizeof(hs->sc_stat), phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY))
ixfer_in(hd, sizeof(hs->sc_stat), hs->sc_stat);
phase = MESG_IN_PHASE;
break;
case MESG_IN_PHASE:
if (ixfer_start(hd, sizeof(hs->sc_msg), phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY)) {
ixfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg);
hd->scsi_scmd = SCMD_RST_ACK;
}
phase = BUS_FREE_PHASE;
break;
case BUS_FREE_PHASE:
goto out;
default:
printf("%s: unexpected phase %d in icmd from %d\n",
hs->sc_dev.dv_xname, phase, target);
goto abort;
}
/* wait for last command to complete */
while ((ints = hd->scsi_ints) == 0) {
if (--wait < 0) {
HIST(cxin_wait, wait)
goto abort;
}
DELAY(1);
}
HIST(cxin_wait, wait)
hd->scsi_ints = ints;
if (ints & INTS_SRV_REQ)
phase = hd->scsi_psns & PHASE;
else if (ints & INTS_DISCON)
goto out;
else if ((ints & INTS_CMD_DONE) == 0) {
scsierror(hs, hd, ints);
goto abort;
}
}
abort:
scsiabort(target, hs, hd, "icmd");
out:
return (hs->sc_stat[0]);
}
/*
* Finish SCSI xfer command: After the completion interrupt from
* a read/write operation, sequence through the final phases in
* programmed i/o. This routine is a lot like scsiicmd except we
* skip (and don't allow) the select, cmd out and data in/out phases.
*/
static void
finishxfer(hs, hd, target)
struct scsi_softc *hs;
volatile register struct scsidevice *hd;
int target;
{
u_char phase, ints;
/*
* We specified padding xfer so we ended with either a phase
* change interrupt (normal case) or an error interrupt (handled
* elsewhere). Reset the board dma logic then try to get the
* completion status & command done msg. The reset confuses
* the SPC REQ/ACK logic so we have to do any status/msg input
* operations via 'manual xfer'.
*/
if (hd->scsi_ssts & SSTS_BUSY) {
int wait = scsi_cmd_wait;
/* wait for dma operation to finish */
while (hd->scsi_ssts & SSTS_BUSY) {
if (--wait < 0) {
#ifdef DEBUG
if (scsi_debug)
printf("finishxfer fail: ssts %x\n",
hd->scsi_ssts);
#endif
HIST(fxfr_wait, wait)
goto abort;
}
}
HIST(fxfr_wait, wait)
}
hd->scsi_scmd |= SCMD_PROG_XFR;
hd->scsi_sctl |= SCTL_CTRLRST;
DELAY(2);
hd->scsi_sctl &=~ SCTL_CTRLRST;
hd->scsi_hconf = 0;
/*
* The following delay is definitely needed when trying to
* write on a write protected disk (in the optical jukebox anyways),
* but we shall see if other unexplained machine freezeups
* also stop occuring... A value of 5 seems to work but
* 10 seems safer considering the potential consequences.
*/
DELAY(10);
hs->sc_stat[0] = 0xff;
hs->sc_msg[0] = 0xff;
hd->scsi_csr = 0;
hd->scsi_ints = ints = hd->scsi_ints;
while (1) {
phase = hd->scsi_psns & PHASE;
switch (phase) {
case STATUS_PHASE:
if (mxfer_in(hd, sizeof(hs->sc_stat), hs->sc_stat,
phase) <= 0)
goto abort;
break;
case MESG_IN_PHASE:
if (mxfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg,
phase) < 0)
goto abort;
break;
case BUS_FREE_PHASE:
return;
default:
printf("%s: unexpected phase %d in finishxfer from %d\n",
hs->sc_dev.dv_xname, phase, target);
goto abort;
}
if (ints = hd->scsi_ints) {
hd->scsi_ints = ints;
if (ints & INTS_DISCON)
return;
else if (ints & ~(INTS_SRV_REQ|INTS_CMD_DONE)) {
scsierror(hs, hd, ints);
break;
}
}
if ((hd->scsi_ssts & SSTS_INITIATOR) == 0)
return;
}
abort:
scsiabort(target, hs, hd, "finishxfer");
hs->sc_stat[0] = 0xfe;
}
int
scsi_test_unit_rdy(ctlr, slave, unit)
int ctlr, slave, unit;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
static struct scsi_cdb6 cdb = { CMD_TEST_UNIT_READY };
cdb.lun = unit;
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), (u_char *)0, 0,
STATUS_PHASE));
}
int
scsi_request_sense(ctlr, slave, unit, buf, len)
int ctlr, slave, unit;
u_char *buf;
unsigned len;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
static struct scsi_cdb6 cdb = { CMD_REQUEST_SENSE };
cdb.lun = unit;
cdb.len = len;
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_IN_PHASE));
}
int
scsi_immed_command(ctlr, slave, unit, cdb, buf, len, rd)
int ctlr, slave, unit, rd;
struct scsi_fmt_cdb *cdb;
u_char *buf;
u_int len;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
cdb->cdb[1] |= unit << 5;
return (scsiicmd(hs, slave, cdb->cdb, cdb->len, buf, len,
rd != 0? DATA_IN_PHASE : DATA_OUT_PHASE));
}
/*
* The following routines are test-and-transfer i/o versions of read/write
* for things like reading disk labels and writing core dumps. The
* routine scsigo should be used for normal data transfers, NOT these
* routines.
*/
int
scsi_tt_read(ctlr, slave, unit, buf, len, blk, bshift)
int ctlr, slave, unit;
u_char *buf;
u_int len;
daddr_t blk;
int bshift;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
struct scsi_cdb10 cdb;
int stat;
int old_wait = scsi_data_wait;
scsi_data_wait = 300000;
bzero(&cdb, sizeof(cdb));
cdb.cmd = CMD_READ_EXT;
cdb.lun = unit;
blk >>= bshift;
cdb.lbah = blk >> 24;
cdb.lbahm = blk >> 16;
cdb.lbalm = blk >> 8;
cdb.lbal = blk;
cdb.lenh = len >> (8 + DEV_BSHIFT + bshift);
cdb.lenl = len >> (DEV_BSHIFT + bshift);
stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_IN_PHASE);
scsi_data_wait = old_wait;
return (stat);
}
int
scsi_tt_write(ctlr, slave, unit, buf, len, blk, bshift)
int ctlr, slave, unit;
u_char *buf;
u_int len;
daddr_t blk;
int bshift;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
struct scsi_cdb10 cdb;
int stat;
int old_wait = scsi_data_wait;
scsi_data_wait = 300000;
bzero(&cdb, sizeof(cdb));
cdb.cmd = CMD_WRITE_EXT;
cdb.lun = unit;
blk >>= bshift;
cdb.lbah = blk >> 24;
cdb.lbahm = blk >> 16;
cdb.lbalm = blk >> 8;
cdb.lbal = blk;
cdb.lenh = len >> (8 + DEV_BSHIFT + bshift);
cdb.lenl = len >> (DEV_BSHIFT + bshift);
stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_OUT_PHASE);
scsi_data_wait = old_wait;
return (stat);
}
int
scsireq(pdev, sq)
struct device *pdev;
struct scsiqueue *sq;
{
struct scsi_softc *hs = (struct scsi_softc *)pdev;
int s;
s = splhigh(); /* XXXthorpej */
TAILQ_INSERT_TAIL(&hs->sc_queue, sq, sq_list);
splx(s);
if (hs->sc_queue.tqh_first == sq)
return (1);
return (0);
}
int
scsiustart(unit)
int unit;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[unit];
hs->sc_dq.dq_chan = DMA0 | DMA1;
hs->sc_flags |= SCSI_HAVEDMA;
if (dmareq(&hs->sc_dq))
return(1);
return(0);
}
void
scsistart(arg)
void *arg;
{
struct scsi_softc *hs = arg;
struct scsiqueue *sq;
sq = hs->sc_queue.tqh_first;
(sq->sq_go)(sq->sq_softc);
}
int
scsigo(ctlr, slave, unit, bp, cdb, pad)
int ctlr, slave, unit;
struct buf *bp;
struct scsi_fmt_cdb *cdb;
int pad;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
volatile register struct scsidevice *hd = hs->sc_regs;
int i, dmaflags;
u_char phase, ints, cmd;
cdb->cdb[1] |= unit << 5;
/* select the SCSI bus (it's an error if bus isn't free) */
if (issue_select(hd, slave, hs->sc_scsi_addr) || wait_for_select(hd)) {
if (hs->sc_flags & SCSI_HAVEDMA) {
hs->sc_flags &=~ SCSI_HAVEDMA;
dmafree(&hs->sc_dq);
}
return (1);
}
/*
* Wait for a phase change (or error) then let the device
* sequence us through command phase (we may have to take
* a msg in/out before doing the command). If the disk has
* to do a seek, it may be a long time until we get a change
* to data phase so, in the absense of an explicit phase
* change, we assume data phase will be coming up and tell
* the SPC to start a transfer whenever it does. We'll get
* a service required interrupt later if this assumption is
* wrong. Otherwise we'll get a service required int when
* the transfer changes to status phase.
*/
phase = CMD_PHASE;
while (1) {
register int wait = scsi_cmd_wait;
switch (phase) {
case CMD_PHASE:
if (ixfer_start(hd, cdb->len, phase, wait))
if (ixfer_out(hd, cdb->len, cdb->cdb))
goto abort;
break;
case MESG_IN_PHASE:
if (ixfer_start(hd, sizeof(hs->sc_msg), phase, wait)||
!(hd->scsi_ssts & SSTS_DREG_EMPTY)) {
ixfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg);
hd->scsi_scmd = SCMD_RST_ACK;
}
phase = BUS_FREE_PHASE;
break;
case DATA_IN_PHASE:
case DATA_OUT_PHASE:
goto out;
default:
printf("%s: unexpected phase %d in go from %d\n",
hs->sc_dev.dv_xname, phase, slave);
goto abort;
}
while ((ints = hd->scsi_ints) == 0) {
if (--wait < 0) {
HIST(sgo_wait, wait)
goto abort;
}
DELAY(1);
}
HIST(sgo_wait, wait)
hd->scsi_ints = ints;
if (ints & INTS_SRV_REQ)
phase = hd->scsi_psns & PHASE;
else if (ints & INTS_CMD_DONE)
goto out;
else {
scsierror(hs, hd, ints);
goto abort;
}
}
out:
/*
* Reset the card dma logic, setup the dma channel then
* get the dio part of the card set for a dma xfer.
*/
hd->scsi_hconf = 0;
cmd = CSR_IE;
dmaflags = DMAGO_NOINT;
if (scsi_pridma)
dmaflags |= DMAGO_PRI;
if (bp->b_flags & B_READ)
dmaflags |= DMAGO_READ;
if ((hs->sc_flags & SCSI_DMA32) &&
((int)bp->b_un.b_addr & 3) == 0 && (bp->b_bcount & 3) == 0) {
cmd |= CSR_DMA32;
dmaflags |= DMAGO_LWORD;
} else
dmaflags |= DMAGO_WORD;
dmago(hs->sc_dq.dq_chan, bp->b_un.b_addr, bp->b_bcount, dmaflags);
if (bp->b_flags & B_READ) {
cmd |= CSR_DMAIN;
phase = DATA_IN_PHASE;
} else
phase = DATA_OUT_PHASE;
/*
* DMA enable bits must be set after size and direction bits.
*/
hd->scsi_csr = cmd;
hd->scsi_csr |= (CSR_DE0 << hs->sc_dq.dq_chan);
/*
* Setup the SPC for the transfer. We don't want to take
* first a command complete then a service required interrupt
* at the end of the transfer so we try to disable the cmd
* complete by setting the transfer counter to more bytes
* than we expect. (XXX - This strategy may have to be
* modified to deal with devices that return variable length
* blocks, e.g., some tape drives.)
*/
cmd = SCMD_XFR;
i = (unsigned)bp->b_bcount;
if (pad) {
cmd |= SCMD_PAD;
/*
* XXX - If we don't do this, the last 2 or 4 bytes
* (depending on word/lword DMA) of a read get trashed.
* It looks like it is necessary for the DMA to complete
* before the SPC goes into "pad mode"??? Note: if we
* also do this on a write, the request never completes.
*/
if (bp->b_flags & B_READ)
i += 2;
#ifdef DEBUG
hs->sc_flags |= SCSI_PAD;
if (i & 1)
printf("%s: odd byte count: %d bytes @ %d\n",
hs->sc_dev.dv_xname, i, bp->b_cylin);
#endif
} else
i += 4;
hd->scsi_tch = i >> 16;
hd->scsi_tcm = i >> 8;
hd->scsi_tcl = i;
hd->scsi_pctl = phase;
hd->scsi_tmod = 0;
hd->scsi_scmd = cmd;
hs->sc_flags |= SCSI_IO;
return (0);
abort:
scsiabort(slave, hs, hd, "go");
hs->sc_flags &=~ SCSI_HAVEDMA;
dmafree(&hs->sc_dq);
return (1);
}
void
scsidone(arg)
void *arg;
{
struct scsi_softc *hs = arg;
volatile register struct scsidevice *hd = hs->sc_regs;
#ifdef DEBUG
if (scsi_debug)
printf("%s: done called!\n", hs->sc_dev.dv_xname);
#endif
/* dma operation is done -- turn off card dma */
hd->scsi_csr &=~ (CSR_DE1|CSR_DE0);
}
int
scsiintr(arg)
void *arg;
{
register struct scsi_softc *hs = arg;
volatile register struct scsidevice *hd = hs->sc_regs;
register u_char ints;
register struct scsiqueue *sq;
int unit = hs->sc_dev.dv_unit;
if ((hd->scsi_csr & (CSR_IE|CSR_IR)) != (CSR_IE|CSR_IR))
return (0);
sq = hs->sc_queue.tqh_first;
ints = hd->scsi_ints;
if ((ints & INTS_SRV_REQ) && (hs->sc_flags & SCSI_IO)) {
/*
* this should be the normal i/o completion case.
* get the status & cmd complete msg then let the
* device driver look at what happened.
*/
#ifdef DEBUG
int len = (hd->scsi_tch << 16) | (hd->scsi_tcm << 8) |
hd->scsi_tcl;
if (!(hs->sc_flags & SCSI_PAD))
len -= 4;
hs->sc_flags &=~ SCSI_PAD;
#endif
finishxfer(hs, hd, sq->sq_target);
hs->sc_flags &=~ (SCSI_IO|SCSI_HAVEDMA);
dmafree(&hs->sc_dq);
(sq->sq_intr)(sq->sq_softc, hs->sc_stat[0]);
} else {
/* Something unexpected happened -- deal with it. */
hd->scsi_ints = ints;
hd->scsi_csr = 0;
scsierror(hs, hd, ints);
scsiabort(sq->sq_target, hs, hd, "intr");
if (hs->sc_flags & SCSI_IO) {
hs->sc_flags &=~ (SCSI_IO|SCSI_HAVEDMA);
dmafree(&hs->sc_dq);
(sq->sq_intr)(sq->sq_softc, -1);
}
}
return(1);
}
void
scsifree(pdev, sq)
struct device *pdev;
struct scsiqueue *sq;
{
struct scsi_softc *hs = (struct scsi_softc *)pdev;
int s;
s = splhigh(); /* XXXthorpej */
TAILQ_REMOVE(&hs->sc_queue, sq, sq_list);
splx(s);
if ((sq = hs->sc_queue.tqh_first) != NULL)
(*sq->sq_start)(sq->sq_softc);
}
/*
* (XXX) The following routine is needed for the SCSI tape driver
* to read odd-size records.
*/
#include "st.h"
#if NST > 0
int
scsi_tt_oddio(ctlr, slave, unit, buf, len, b_flags, freedma)
int ctlr, slave, unit, b_flags, freedma;
u_char *buf;
u_int len;
{
struct scsi_softc *hs = oscsi_cd.cd_devs[ctlr];
struct scsi_cdb6 cdb;
u_char iphase;
int stat;
#ifdef DEBUG
if (freedma && (hs->sc_flags & SCSI_HAVEDMA) == 0 ||
!freedma && (hs->sc_flags & SCSI_HAVEDMA))
printf("oddio: freedma (%d) inconsistency (flags=%x)\n",
freedma, hs->sc_flags);
#endif
/*
* First free any DMA channel that was allocated.
* We can't use DMA to do this transfer.
*/
if (freedma) {
hs->sc_flags &=~ SCSI_HAVEDMA;
dmafree(hs->sc_dq);
}
/*
* Initialize command block
*/
bzero(&cdb, sizeof(cdb));
cdb.lun = unit;
cdb.lbam = (len >> 16) & 0xff;
cdb.lbal = (len >> 8) & 0xff;
cdb.len = len & 0xff;
if (buf == 0) {
cdb.cmd = CMD_SPACE;
cdb.lun |= 0x00;
len = 0;
iphase = MESG_IN_PHASE;
} else if (b_flags & B_READ) {
cdb.cmd = CMD_READ;
iphase = DATA_IN_PHASE;
} else {
cdb.cmd = CMD_WRITE;
iphase = DATA_OUT_PHASE;
}
/*
* Perform command (with very long delays)
*/
scsi_delay(30000000);
stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, iphase);
scsi_delay(0);
return (stat);
}
#endif
/*
* Copy a counted string, trimming the trailing space, and turn
* the result into a C-style string.
*/
void
scsi_str(src, dst, len)
char *src, *dst;
size_t len;
{
while (src[len - 1] == ' ') {
if (--len == 0) {
*dst = '\0';
return;
}
}
bcopy(src, dst, len);
dst[len] = '\0';
}
/*
* Probe for a device at the given ctlr/target/lun, and fill in the inqbuf.
*/
int
scsi_probe_device(ctlr, targ, lun, inqbuf, inqlen)
int ctlr, targ, lun;
struct scsi_inquiry *inqbuf;
int inqlen;
{
static struct scsi_fmt_cdb inq = {
6, CMD_INQUIRY, 0, 0, 0, 0, 0
};
int i, tries = 10, isrm = 0;
inq.cdb[4] = inqlen & 0xff;
scsi_delay(-1);
/*
* See if the unit exists.
*/
while ((i = scsi_test_unit_rdy(ctlr, targ, lun)) != 0) {
if (i == -1 || --tries < 0) {
if (isrm)
break;
/* doesn't exist or not a CCS device */
goto failed;
}
if (i == STS_CHECKCOND) {
u_char sensebuf[128];
struct scsi_xsense *sp =
(struct scsi_xsense *)sensebuf;
scsi_request_sense(ctlr, targ, lun, sensebuf,
sizeof(sensebuf));
if (sp->class == 7) {
switch (sp->key) {
/*
* Not ready -- might be removable media
* device with no media. Assume as much,
* if it really isn't, the inquiry command
* below will fail.
*/
case 2:
isrm = 1;
break;
/* drive doing an RTZ -- give it a while */
case 6:
delay(1000000);
break;
default:
break;
}
}
}
delay(1000);
}
/*
* Find out about the device.
*/
if (scsi_immed_command(ctlr, targ, lun, &inq, (u_char *)inqbuf,
inqlen, B_READ))
goto failed;
scsi_delay(0);
return (0);
failed:
scsi_delay(0);
return (-1);
}
Reference in New Issue View Git Blame Copy Permalink