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NetBSD/sys/arch/sgimips/hpc/sbic.c

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/* $NetBSD: sbic.c,v 1.1 2001/08/19 03:16:22 wdk Exp $ */
/*
* Changes Copyright (c) 2001 Wayne Knowles
* Changes Copyright (c) 1996 Steve Woodford
* Original Copyright (c) 1994 Christian E. Hopps
* Copyright (c) 1990 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 7.5 (Berkeley) 5/4/91
*/
/*
* This version of the driver is pretty well generic, so should work with
* any flavour of WD33C93 chip.
*/
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h> /* For hz */
#include <sys/disklabel.h>
#include <sys/dkstat.h>
#include <sys/buf.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <uvm/uvm_extern.h>
#include <machine/bus.h>
#include <sgimips/hpc/sbicreg.h>
#include <sgimips/hpc/sbicvar.h>
/*
* Since I can't find this in any other header files
*/
#define SCSI_PHASE(reg) (reg&0x07)
/*
* SCSI delays
* In u-seconds, primarily for state changes on the SPC.
*/
#define SBIC_CMD_WAIT 50000 /* wait per step of 'immediate' cmds */
#define SBIC_DATA_WAIT 50000 /* wait per data in/out step */
#define SBIC_INIT_WAIT 50000 /* wait per step (both) during init */
/*
* Convenience macro for waiting for a particular sbic event
*/
#define SBIC_WAIT(regs, until, timeo) sbicwait(regs, until, timeo, __LINE__)
int sbicicmd __P((struct sbic_softc *, void *, int, void *, int));
int sbicgo __P((struct sbic_softc *, struct scsipi_xfer *));
int sbicdmaok __P((struct sbic_softc *, struct scsipi_xfer *));
int sbicwait __P((struct sbic_softc *, u_char, int , int));
u_char sbicselectbus __P((struct sbic_softc *));
int sbicxfout __P((struct sbic_softc *, int, void *));
int sbicxfin __P((struct sbic_softc *, int, void *));
int sbicfromscsiperiod __P((struct sbic_softc *, int));
int sbictoscsiperiod __P((struct sbic_softc *, int));
int sbicpoll __P((struct sbic_softc *));
int sbicnextstate __P((struct sbic_softc *, u_char, u_char));
int sbicmsgin __P((struct sbic_softc *));
int sbicabort __P((struct sbic_softc *, char *));
void sbicxfdone __P((struct sbic_softc *));
void sbicerror __P((struct sbic_softc *,u_char));
void sbicreset __P((struct sbic_softc *));
void sbic_scsidone __P((struct sbic_acb *, int));
void sbic_sched __P((struct sbic_softc *));
void sbic_dma_stop __P((struct sbic_softc *));
void sbic_dma_setup __P((struct sbic_softc *));
/*
* Synch xfer parameters, and timing conversions
*/
int sbic_min_period = SBIC_SYN_MIN_PERIOD; /* in cycles = f(ICLK,FSn) */
int sbic_max_offset = SBIC_SYN_MAX_OFFSET; /* pure number */
int sbic_cmd_wait = SBIC_CMD_WAIT;
int sbic_data_wait = SBIC_DATA_WAIT;
int sbic_init_wait = SBIC_INIT_WAIT;
/*
* was broken before.. now if you want this you get it for all drives
* on sbic controllers.
*/
u_char sbic_inhibit_sync[8];
int sbic_enable_reselect = 1; /* Allow Disconnect / Reselect */
int sbic_no_dma = 0; /* Use PIO transfers instead of DMA */
int sbic_parallel_operations = 1; /* Allow command queues */
/*
* Some useful stuff for debugging purposes
*/
#ifdef DEBUG
#define QPRINTF(a) if (sbic_debug) printf a
int sbic_debug = 0; /* Debug all chip related things */
int sync_debug = 0; /* Debug all Synchronous Scsi related things */
int reselect_debug = 0; /* Debug all reselection related things */
int data_pointer_debug = 0; /* Debug Data Pointer related things */
void sbictimeout __P((struct sbic_softc *dev));
#else
#define QPRINTF(a) /* */
#endif
/*
* Save DMA pointers. Take into account partial transfer. Shut down DMA.
*/
void
sbic_dma_stop(dev)
struct sbic_softc *dev;
{
struct sbic_acb* acb;
int count,
asr,
s;
/*
* Only need to save pointers if DMA was active...
*/
if ((dev->sc_flags & SBICF_INDMA) == 0)
return;
s = splbio();
/*
* Wait until WD chip is idle
*/
do {
GET_SBIC_asr(dev, asr); /* XXX */
if (asr & SBIC_ASR_DBR) {
printf("sbic_dma_stop: asr %02x canceled!\n", asr);
splx(s);
return;
}
} while(asr & (SBIC_ASR_BSY|SBIC_ASR_CIP));
/*
* Save important state.
* must be done before dmastop
*/
acb = dev->sc_nexus;
acb->sc_usedma = dev->sc_usedma;
/*
* Fetch the residual count
*/
SBIC_TC_GET(dev, count);
/*
* Shut down DMA
*/
dev->sc_dmastop(dev);
/*
* No longer in DMA
*/
dev->sc_flags &= ~SBICF_INDMA;
/*
* Ensure the WD chip is back in polled I/O mode, with nothing to
* transfer.
*/
SBIC_TC_PUT(dev, 0);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
/*
* Update current count...
*/
acb->sc_tcnt = count;
/*
* Work out how many bytes were actually transferred
*/
count = dev->sc_tcnt - count;
dev->sc_tcnt = acb->sc_tcnt;
/*
* Fixup partial xfers
*/
acb->sc_kv.dc_addr += count;
acb->sc_kv.dc_count -= count;
#ifdef DEBUG
if (data_pointer_debug)
printf("dma_stop\n");
#endif
splx(s);
}
/*
* Setup for dma transfer
*/
void
sbic_dma_setup(dev)
struct sbic_softc *dev;
{
struct sbic_acb *acb = dev->sc_nexus;
int s;
if (acb->sc_kv.dc_count) {
s = splbio();
dev->sc_tcnt = dev->sc_dmasetup(dev, dev->sc_dmamap,
acb->flags);
splx(s);
}
return;
}
/*
* used by specific sbic controller
*
* it appears that the higher level code does nothing with LUN's
* so I will too. I could plug it in, however so could they
* in scsi_scsipi_cmd().
*/
void
sbic_scsi_request(chan, req, arg)
struct scsipi_channel *chan;
scsipi_adapter_req_t req;
void *arg;
{
struct scsipi_xfer *xs;
struct scsipi_periph *periph;
struct sbic_softc *dev = (void *)chan->chan_adapter->adapt_dev;
struct sbic_acb *acb;
int flags, s;
switch (req) {
case ADAPTER_REQ_RUN_XFER:
xs = arg;
periph = xs->xs_periph;
flags = xs->xs_control;
if (flags & XS_CTL_DATA_UIO)
panic("sbic: scsi data uio requested");
if (dev->sc_nexus && (flags & XS_CTL_POLL))
panic("sbic_scsicmd: busy");
s = splbio();
if ((acb = dev->free_list.tqh_first) != NULL)
TAILQ_REMOVE(&dev->free_list, acb, chain);
splx(s);
if (acb == NULL) {
#ifdef DEBUG
printf("sbic_scsicmd: unable to queue request for target %d\n",
periph->periph_target);
#ifdef DDB
Debugger();
#endif
#endif
xs->error = XS_RESOURCE_SHORTAGE;
scsipi_done(xs);
return;
}
if (flags & XS_CTL_DATA_IN)
acb->flags = ACB_ACTIVE | ACB_DATAIN;
else
acb->flags = ACB_ACTIVE;
acb->xs = xs;
acb->clen = xs->cmdlen;
acb->sc_kv.dc_addr = xs->data;
acb->sc_kv.dc_count = xs->datalen;
memcpy(&acb->cmd, xs->cmd, xs->cmdlen);
if (sbic_no_dma || flags & XS_CTL_POLL) {
/*
* This has major side effects -- it locks up the machine
*/
int stat;
s = splbio();
dev->sc_flags |= SBICF_ICMD;
do {
/*
* If we already had a nexus, while away the time until idle...
* This is likely only to happen if a reselection occurs
* between here and our earlier check for ICMD && sc_nexus
* (which would have resulted in a panic() had it been true).
*/
while (dev->sc_nexus)
sbicpoll(dev);
/*
* Fix up the new nexus
*/
dev->sc_nexus = acb;
dev->sc_xs = xs;
dev->target = periph->periph_target;
dev->lun = periph->periph_lun;
stat = sbicicmd(dev, &acb->cmd, acb->clen,
acb->sc_kv.dc_addr, acb->sc_kv.dc_count);
} while (dev->sc_nexus != acb);
sbic_scsidone(acb, stat);
splx(s);
return;
}
s = splbio();
TAILQ_INSERT_TAIL(&dev->ready_list, acb, chain);
/*
* If nothing is active, try to start it now.
*/
if (dev->sc_nexus == NULL)
sbic_sched(dev);
splx(s);
return;
case ADAPTER_REQ_GROW_RESOURCES:
/* XXX Not supported. */
return;
case ADAPTER_REQ_SET_XFER_MODE:
/* XXX Not supported. */
return;
}
}
/*
* attempt to start the next available command
*/
void
sbic_sched(dev)
struct sbic_softc *dev;
{
struct scsipi_xfer *xs;
struct scsipi_periph *periph = NULL; /* Gag the compiler */
struct sbic_acb *acb;
int flags,
stat;
/*
* XXXSCW
* I'll keep this test here, even though I can't see any obvious way
* in which sbic_sched() could be called with sc_nexus non NULL
*/
if (dev->sc_nexus)
return; /* a command is current active */
/*
* Loop through the ready list looking for work to do...
*/
for (acb = dev->ready_list.tqh_first; acb; acb = acb->chain.tqe_next) {
int i, j;
periph = acb->xs->xs_periph;
i = periph->periph_target;
j = 1 << periph->periph_lun;
/*
* We've found a potential command, but is the target/lun busy?
*/
if ((dev->sc_tinfo[i].lubusy & j) == 0) {
/*
* Nope, it's not busy, so we can use it.
*/
dev->sc_tinfo[i].lubusy |= j;
TAILQ_REMOVE(&dev->ready_list, acb, chain);
dev->sc_nexus = acb;
break;
}
}
if (acb == NULL) {
QPRINTF(("sbicsched: no work\n"));
return; /* did not find an available command */
}
#ifdef DEBUG
if (data_pointer_debug)
printf("sbic_sched(%d,%d)\n", periph->periph_target,
periph->periph_lun);
#endif
dev->sc_xs = xs = acb->xs;
flags = xs->xs_control;
if (flags & XS_CTL_RESET)
sbicreset(dev);
dev->sc_stat[0] = -1;
dev->target = periph->periph_target;
dev->lun = periph->periph_lun;
if (flags & XS_CTL_POLL || (!sbic_parallel_operations &&
(sbicdmaok(dev, xs) == 0)))
stat = sbicicmd(dev, &acb->cmd, acb->clen,
acb->sc_kv.dc_addr, acb->sc_kv.dc_count);
else
if (sbicgo(dev, xs) == 0 && xs->error != XS_SELTIMEOUT)
return;
else
stat = dev->sc_stat[0];
sbic_scsidone(acb, stat);
}
void
sbic_scsidone(acb, stat)
struct sbic_acb *acb;
int stat;
{
struct scsipi_xfer *xs = acb->xs;
struct scsipi_periph *periph = xs->xs_periph;
struct sbic_softc *dev = (void *)periph->periph_channel->chan_adapter->adapt_dev;
int dosched = 0;
#ifdef DIAGNOSTIC
if (acb == NULL || xs == NULL) {
panic("sbic_scsidone -- (%d,%d) no scsipi_xfer\n",
dev->target, dev->lun);
}
#endif
#ifdef DEBUG
if (data_pointer_debug)
printf("scsidone: (%d,%d)->(%d,%d)%02x\n", periph->periph_target,
periph->periph_lun, dev->target, dev->lun, stat);
if (xs->xs_periph->periph_target == dev->sc_channel.chan_id)
panic("target == hostid");
#endif
xs->status = stat;
xs->resid = 0; /* XXXX */
if (xs->error == XS_NOERROR) {
if (stat == SCSI_CHECK || stat == SCSI_BUSY)
xs->error = XS_BUSY;
}
/*
* Remove the ACB from whatever queue it's on. We have to do a bit of
* a hack to figure out which queue it's on. Note that it is *not*
* necessary to cdr down the ready queue, but we must cdr down the
* nexus queue and see if it's there, so we can mark the unit as no
* longer busy. This code is sickening, but it works.
*/
if (acb == dev->sc_nexus) {
dev->sc_nexus = NULL;
dev->sc_xs = NULL;
dev->sc_tinfo[periph->periph_target].lubusy &=
~(1 << periph->periph_lun);
if (dev->ready_list.tqh_first)
dosched = 1; /* start next command */
} else
if (dev->ready_list.tqh_last == &acb->chain.tqe_next) {
TAILQ_REMOVE(&dev->ready_list, acb, chain);
} else {
struct sbic_acb *a;
for (a = dev->nexus_list.tqh_first; a; a = a->chain.tqe_next) {
if (a == acb) {
TAILQ_REMOVE(&dev->nexus_list, acb, chain);
dev->sc_tinfo[periph->periph_target].lubusy &=
~(1 << periph->periph_lun);
break;
}
}
if (a == NULL) {
if (acb->chain.tqe_next)
TAILQ_REMOVE(&dev->ready_list, acb, chain);
else
panic("%s: can't find matching acb\n",
dev->sc_dev.dv_xname);
}
}
/*
* Put it on the free list.
*/
acb->flags = ACB_FREE;
TAILQ_INSERT_HEAD(&dev->free_list, acb, chain);
dev->sc_tinfo[periph->periph_target].cmds++;
scsipi_done(xs);
if (dosched)
sbic_sched(dev);
}
/*
* Check if current operation can be done using DMA
*
* returns 1 if DMA OK
*/
int
sbicdmaok(dev, xs)
struct sbic_softc *dev;
struct scsipi_xfer *xs;
{
if (sbic_no_dma || xs->datalen == 0)
return (0);
return(1);
if (sbic_no_dma || xs->datalen == 0 ||
xs->datalen & 0x03 || (int)xs->data & 0x03)
return(0);
return(1);
}
int
sbicwait(dev, until, timeo, line)
struct sbic_softc *dev;
u_char until;
int timeo;
int line;
{
u_char val;
if (timeo == 0)
timeo = 1000000; /* some large value.. */
GET_SBIC_asr(dev, val);
while ((val & until) == 0) {
if (timeo-- == 0) {
int csr;
GET_SBIC_csr(dev, csr);
printf("sbicwait TIMEO @%d with asr=x%x csr=x%x\n",
line, val, csr);
#if defined(DDB) && defined(DEBUG)
Debugger();
#endif
return(val); /* Maybe I should abort */
break;
}
DELAY(1);
GET_SBIC_asr(dev, val);
}
return(val);
}
int
sbicabort(dev, where)
struct sbic_softc *dev;
char *where;
{
u_char csr,
asr;
GET_SBIC_asr(dev, asr);
GET_SBIC_csr(dev, csr);
printf ("%s: abort %s: csr = 0x%02x, asr = 0x%02x\n",
dev->sc_dev.dv_xname, where, csr, asr);
/*
* Clean up chip itself
*/
if (dev->sc_flags & SBICF_SELECTED) {
while (asr & SBIC_ASR_DBR) {
/*
* sbic is jammed w/data. need to clear it
* But we don't know what direction it needs to go
*/
GET_SBIC_data(dev, asr);
printf("%s: abort %s: clearing data buffer 0x%02x\n",
dev->sc_dev.dv_xname, where, asr);
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_DBR) /* Not the read direction, then */
SET_SBIC_data(dev, asr);
GET_SBIC_asr(dev, asr);
}
WAIT_CIP(dev);
printf("%s: sbicabort - sending ABORT command\n", dev->sc_dev.dv_xname);
SET_SBIC_cmd(dev, SBIC_CMD_ABORT);
WAIT_CIP(dev);
GET_SBIC_asr(dev, asr);
if (asr & (SBIC_ASR_BSY|SBIC_ASR_LCI)) {
/*
* ok, get more drastic..
*/
printf("%s: sbicabort - asr %x, trying to reset\n",
dev->sc_dev.dv_xname, asr);
sbicreset(dev);
dev->sc_flags &= ~SBICF_SELECTED;
return SBIC_STATE_ERROR;
}
printf("%s: sbicabort - sending DISC command\n", dev->sc_dev.dv_xname);
SET_SBIC_cmd(dev, SBIC_CMD_DISC);
do {
SBIC_WAIT (dev, SBIC_ASR_INT, 0);
GET_SBIC_asr(dev, asr);
GET_SBIC_csr(dev, csr);
QPRINTF(("csr: 0x%02x, asr: 0x%02x\n", csr, asr));
} while ((csr != SBIC_CSR_DISC) && (csr != SBIC_CSR_DISC_1) &&
(csr != SBIC_CSR_CMD_INVALID));
/*
* lets just hope it worked..
*/
dev->sc_flags &= ~SBICF_SELECTED;
}
return SBIC_STATE_ERROR;
}
/*
* Initialize driver-private structures
*/
void
sbicinit(dev)
struct sbic_softc *dev;
{
u_int i;
if ((dev->sc_flags & SBICF_ALIVE) == 0) {
struct sbic_acb *acb;
TAILQ_INIT(&dev->ready_list);
TAILQ_INIT(&dev->nexus_list);
TAILQ_INIT(&dev->free_list);
callout_init(&dev->sc_timo_ch);
dev->sc_nexus = NULL;
dev->sc_xs = NULL;
acb = dev->sc_acb;
memset(acb, 0, sizeof(dev->sc_acb));
for (i = 0; i < sizeof(dev->sc_acb) / sizeof(*acb); i++) {
TAILQ_INSERT_TAIL(&dev->free_list, acb, chain);
acb++;
}
memset(dev->sc_tinfo, 0, sizeof(dev->sc_tinfo));
#ifdef DEBUG
/*
* make sure timeout is really not needed
*/
callout_reset(&dev->sc_timo_ch, 30 * hz, (void *)sbictimeout, dev);
#endif
} else
panic("sbic: reinitializing driver!");
dev->sc_flags |= SBICF_ALIVE;
dev->sc_flags &= ~SBICF_SELECTED;
/*
* initialize inhibit array
* Never enable Sync, since it just doesn't work on mvme147 :(
*/
for (i = 0; i < 8; ++i)
sbic_inhibit_sync[i] = 1;
sbicreset(dev);
}
void
sbicreset(dev)
struct sbic_softc *dev;
{
u_int my_id,
s;
u_char csr;
s = splbio();
my_id = dev->sc_channel.chan_id & SBIC_ID_MASK;
if (dev->sc_clkfreq < 110)
my_id |= SBIC_ID_FS_8_10;
else if (dev->sc_clkfreq < 160)
my_id |= SBIC_ID_FS_12_15;
else if (dev->sc_clkfreq < 210)
my_id |= SBIC_ID_FS_16_20;
SET_SBIC_myid(dev, my_id);
/*
* Reset the chip
*/
SET_SBIC_cmd(dev, SBIC_CMD_RESET);
DELAY(25);
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
GET_SBIC_csr(dev, csr); /* clears interrupt also */
/*
* Set up various chip parameters
*/
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
/*
* don't allow Selection (SBIC_RID_ES)
* until we can handle target mode!!
*/
SET_SBIC_rselid(dev, SBIC_RID_ER);
/*
* Asynchronous for now
*/
SET_SBIC_syn(dev, 0);
/*
* Anything else was zeroed by reset
*/
splx(s);
dev->sc_flags &= ~SBICF_SELECTED;
}
void
sbicerror(dev, csr)
struct sbic_softc *dev;
u_char csr;
{
struct scsipi_xfer *xs = dev->sc_xs;
#ifdef DIAGNOSTIC
if (xs == NULL)
panic("sbicerror: dev->sc_xs == NULL");
#endif
if (xs->xs_control & XS_CTL_SILENT)
return;
printf("%s: csr == 0x%02x\n", dev->sc_dev.dv_xname, csr);
}
/*
* select the bus, return when selected or error.
*
* Returns the current CSR following selection and optionally MSG out phase.
* i.e. the returned CSR *should* indicate CMD phase...
* If the return value is 0, some error happened.
*/
u_char
sbicselectbus(dev)
struct sbic_softc *dev;
{
u_char target = dev->target,
lun = dev->lun,
asr,
csr,
id;
/*
* if we're already selected, return (XXXX panic maybe?)
*/
if (dev->sc_flags & SBICF_SELECTED)
return(0);
QPRINTF(("sbicselectbus %d: ", target));
/*
* issue select
*/
SET_SBIC_selid(dev, target);
SET_SBIC_timeo(dev, SBIC_TIMEOUT(250, dev->sc_clkfreq));
GET_SBIC_asr(dev, asr);
if (asr & (SBIC_ASR_INT|SBIC_ASR_BSY)) {
/*
* This means we got ourselves reselected upon
*/
QPRINTF(("WD busy (reselect?) ASR=%02x\n", asr));
return 0;
}
SET_SBIC_cmd(dev, SBIC_CMD_SEL_ATN);
/*
* wait for select (merged from seperate function may need
* cleanup)
*/
WAIT_CIP(dev);
do {
asr = SBIC_WAIT(dev, SBIC_ASR_INT | SBIC_ASR_LCI, 0);
if (asr & SBIC_ASR_LCI) {
QPRINTF(("late LCI: asr %02x\n", asr));
return 0;
}
/*
* Clear interrupt
*/
GET_SBIC_csr (dev, csr);
QPRINTF(("%02x ", csr));
/*
* Reselected from under our feet?
*/
if (csr == SBIC_CSR_RSLT_NI || csr == SBIC_CSR_RSLT_IFY) {
QPRINTF(("got reselected, asr %02x\n", asr));
/*
* We need to handle this now so we don't lock up later
*/
sbicnextstate(dev, csr, asr);
return 0;
}
/*
* Whoops!
*/
if (csr == SBIC_CSR_SLT || csr == SBIC_CSR_SLT_ATN) {
panic("sbicselectbus: target issued select!");
return 0;
}
} while (csr != (SBIC_CSR_MIS_2 | MESG_OUT_PHASE) &&
csr != (SBIC_CSR_MIS_2 | CMD_PHASE) &&
csr != SBIC_CSR_SEL_TIMEO);
/*
* Anyone at home?
*/
if (csr == SBIC_CSR_SEL_TIMEO) {
dev->sc_xs->error = XS_SELTIMEOUT;
QPRINTF(("Selection Timeout\n"));
return 0;
}
QPRINTF(("Selection Complete\n"));
/*
* Assume we're now selected
*/
GET_SBIC_selid(dev, id);
dev->target = id;
dev->lun = lun;
dev->sc_flags |= SBICF_SELECTED;
/*
* Enable (or not) reselection
* XXXSCW This is probably not necessary since we don't use use the
* Select-and-Xfer-with-ATN command to initiate a selection...
*/
if (!sbic_enable_reselect && dev->nexus_list.tqh_first == NULL)
SET_SBIC_rselid (dev, 0);
else
SET_SBIC_rselid (dev, SBIC_RID_ER);
/*
* We only really need to do anything when the target goes to MSG out
* If the device ignored ATN, it's probably old and brain-dead,
* but we'll try to support it anyhow.
* If it doesn't support message out, it definately doesn't
* support synchronous transfers, so no point in even asking...
*/
if (csr == (SBIC_CSR_MIS_2 | MESG_OUT_PHASE)) {
/*
* Send identify message (SCSI-2 requires an identify msg)
*/
if (sbic_inhibit_sync[id] && dev->sc_sync[id].state == SYNC_START) {
/*
* Handle drives that don't want to be asked
* whether to go sync at all.
*/
dev->sc_sync[id].offset = 0;
dev->sc_sync[id].period = sbic_min_period;
dev->sc_sync[id].state = SYNC_DONE;
}
/*
* Do we need to negotiate Synchronous Xfers for this target?
*/
if (dev->sc_sync[id].state != SYNC_START) {
/*
* Nope, we've already negotiated.
* Now see if we should allow the target to disconnect/reselect...
*/
if (sbic_no_dma || dev->sc_xs->xs_control & XS_CTL_POLL ||
dev->sc_flags & SBICF_ICMD || !sbic_enable_reselect)
SEND_BYTE (dev, MSG_IDENTIFY | lun);
else
SEND_BYTE (dev, MSG_IDENTIFY_DR | lun);
} else {
/*
* try to initiate a sync transfer.
* So compose the sync message we're going
* to send to the target
*/
#ifdef DEBUG
if (sync_debug)
printf("\nSending sync request to target %d ... ", id);
#endif
/*
* setup scsi message sync message request
*/
dev->sc_msg[0] = MSG_IDENTIFY | lun;
dev->sc_msg[1] = MSG_EXT_MESSAGE;
dev->sc_msg[2] = 3;
dev->sc_msg[3] = MSG_SYNC_REQ;
dev->sc_msg[4] = sbictoscsiperiod(dev, sbic_min_period);
dev->sc_msg[5] = sbic_max_offset;
sbicxfout(dev, 6, dev->sc_msg);
dev->sc_sync[id].state = SYNC_SENT;
#ifdef DEBUG
if (sync_debug)
printf ("sent\n");
#endif
}
/*
* There's one interrupt still to come: the change to CMD phase...
*/
SBIC_WAIT(dev, SBIC_ASR_INT , 0);
GET_SBIC_csr(dev, csr);
}
/*
* set sync or async
*/
if (dev->sc_sync[target].state == SYNC_DONE) {
#ifdef DEBUG
if (sync_debug)
printf("select(%d): sync reg = 0x%02x\n", target,
SBIC_SYN(dev->sc_sync[target].offset,
dev->sc_sync[target].period));
#endif
SET_SBIC_syn(dev, SBIC_SYN(dev->sc_sync[target].offset,
dev->sc_sync[target].period));
} else {
#ifdef DEBUG
if (sync_debug)
printf("select(%d): sync reg = 0x%02x\n", target,
SBIC_SYN(0,sbic_min_period));
#endif
SET_SBIC_syn(dev, SBIC_SYN(0, sbic_min_period));
}
return csr;
}
/*
* Information Transfer *to* a Scsi Target.
*
* Note: Don't expect there to be an interrupt immediately after all
* the data is transferred out. The WD spec sheet says that the Transfer-
* Info command for non-MSG_IN phases only completes when the target
* next asserts 'REQ'. That is, when the SCSI bus changes to a new state.
*
* This can have a nasty effect on commands which take a relatively long
* time to complete, for example a START/STOP unit command may remain in
* CMD phase until the disk has spun up. Only then will the target change
* to STATUS phase. This is really only a problem for immediate commands
* since we don't allow disconnection for them (yet).
*/
int
sbicxfout(dev, len, bp)
struct sbic_softc *dev;
int len;
void *bp;
{
int wait = sbic_data_wait;
u_char asr,
*buf = bp;
QPRINTF(("sbicxfout {%d} %02x %02x %02x %02x %02x "
"%02x %02x %02x %02x %02x\n", len, buf[0], buf[1], buf[2],
buf[3], buf[4], buf[5], buf[6], buf[7], buf[8], buf[9]));
/*
* sigh.. WD-PROTO strikes again.. sending the command in one go
* causes the chip to lock up if talking to certain (misbehaving?)
* targets. Anyway, this procedure should work for all targets, but
* it's slightly slower due to the overhead
*/
WAIT_CIP (dev);
SBIC_TC_PUT (dev, 0);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
SBIC_TC_PUT (dev, (unsigned)len);
SET_SBIC_cmd (dev, SBIC_CMD_XFER_INFO);
/*
* Loop for each byte transferred
*/
do {
GET_SBIC_asr (dev, asr);
if (asr & SBIC_ASR_DBR) {
if (len) {
SET_SBIC_data (dev, *buf);
buf++;
len--;
} else {
SET_SBIC_data (dev, 0);
}
wait = sbic_data_wait;
}
} while (len && (asr & SBIC_ASR_INT) == 0 && wait-- > 0);
#ifdef DEBUG
QPRINTF(("sbicxfout done: %d bytes remaining (wait:%d)\n", len, wait));
#endif
/*
* Normally, an interrupt will be pending when this routing returns.
*/
return(len);
}
/*
* Information Transfer *from* a Scsi Target
* returns # bytes left to read
*/
int
sbicxfin(dev, len, bp)
struct sbic_softc *dev;
int len;
void *bp;
{
int wait = sbic_data_wait;
u_char *buf = bp;
u_char asr;
#ifdef DEBUG
u_char *obp = bp;
#endif
WAIT_CIP (dev);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
SBIC_TC_PUT (dev, (unsigned)len);
SET_SBIC_cmd (dev, SBIC_CMD_XFER_INFO);
/*
* Loop for each byte transferred
*/
do {
GET_SBIC_asr (dev, asr);
if (asr & SBIC_ASR_DBR) {
if (len) {
GET_SBIC_data (dev, *buf);
buf++;
len--;
} else {
u_char foo;
GET_SBIC_data (dev, foo);
}
wait = sbic_data_wait;
}
} while ((asr & SBIC_ASR_INT) == 0 && wait-- > 0);
QPRINTF(("sbicxfin {%d} %02x %02x %02x %02x %02x %02x "
"%02x %02x %02x %02x\n", len, obp[0], obp[1], obp[2],
obp[3], obp[4], obp[5], obp[6], obp[7], obp[8], obp[9]));
SBIC_TC_PUT (dev, 0);
/*
* this leaves with one csr to be read
*/
return len;
}
/*
* 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.
*
* Note that although this routine looks like it can handle disconnect/
* reselect, the fact is that it can't. There is still some work to be
* done to clean this lot up.
*/
int
sbicicmd(dev, cbuf, clen, buf, len)
struct sbic_softc *dev;
void *cbuf,
*buf;
int clen,
len;
{
struct sbic_acb *acb = dev->sc_nexus;
u_char csr,
asr;
int still_busy = SBIC_STATE_RUNNING;
/*
* Make sure pointers are OK
*/
dev->sc_tcnt = acb->sc_tcnt = 0;
acb->sc_usedma = 0;
acb->sc_kv.dc_addr = buf;
acb->sc_kv.dc_count = len;
#ifdef DEBUG
if (data_pointer_debug)
printf("sbicicmd(%d,%d):%d\n", dev->target, dev->lun, acb->sc_kv.dc_count);
#endif
/*
* set the sbic into non-DMA mode
*/
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
dev->sc_stat[0] = 0xff;
dev->sc_msg[0] = 0xff;
/*
* We're stealing the SCSI bus
*/
dev->sc_flags |= SBICF_ICMD;
do {
GET_SBIC_asr (dev, asr);
/*
* select the SCSI bus (it's an error if bus isn't free)
*/
if ((dev->sc_flags & SBICF_SELECTED) == 0 &&
still_busy != SBIC_STATE_DISCONNECT) {
if ((csr = sbicselectbus(dev)) == 0) {
dev->sc_flags &= ~SBICF_ICMD;
return(-1);
}
} else
if ((asr & (SBIC_ASR_BSY | SBIC_ASR_INT)) == SBIC_ASR_INT)
GET_SBIC_csr(dev, csr);
else
csr = 0;
if (csr) {
QPRINTF((">ASR:0x%02x CSR:0x%02x< ", asr, csr));
switch (csr) {
case SBIC_CSR_S_XFERRED:
case SBIC_CSR_DISC:
case SBIC_CSR_DISC_1:
{
u_char phase;
dev->sc_flags &= ~SBICF_SELECTED;
GET_SBIC_cmd_phase (dev, phase);
if (phase == 0x60) {
GET_SBIC_tlun (dev, dev->sc_stat[0]);
still_busy = SBIC_STATE_DONE; /* done */
} else {
#ifdef DEBUG
if (reselect_debug)
printf("sbicicmd: handling disconnect\n");
#endif
still_busy = SBIC_STATE_DISCONNECT;
}
}
break;
case SBIC_CSR_XFERRED | CMD_PHASE:
case SBIC_CSR_MIS | CMD_PHASE:
case SBIC_CSR_MIS_1 | CMD_PHASE:
case SBIC_CSR_MIS_2 | CMD_PHASE:
{
if (sbicxfout(dev, clen, cbuf))
still_busy = sbicabort(dev, "icmd sending cmd");
}
break;
case SBIC_CSR_XFERRED | STATUS_PHASE:
case SBIC_CSR_MIS | STATUS_PHASE:
case SBIC_CSR_MIS_1 | STATUS_PHASE:
case SBIC_CSR_MIS_2 | STATUS_PHASE:
{
/*
* The sbic does the status/cmd-complete reading ok,
* so do this with its hi-level commands.
*/
#ifdef DEBUG
if (sbic_debug)
printf("SBICICMD status phase (bsy=%d)\n", still_busy);
#endif
SET_SBIC_cmd_phase(dev, 0x46);
SET_SBIC_cmd(dev, SBIC_CMD_SEL_ATN_XFER);
}
break;
default:
{
still_busy = sbicnextstate(dev, csr, asr);
}
break;
}
/*
* make sure the last command was taken,
* ie. we're not hunting after an ignored command..
*/
GET_SBIC_asr(dev, asr);
/*
* tapes may take a loooong time..
*/
while (asr & SBIC_ASR_BSY) {
if (asr & SBIC_ASR_DBR) {
int i;
printf("sbicicmd: Waiting while sbic is jammed, CSR:%02x,ASR:%02x\n", csr,asr);
#ifdef DDB
Debugger();
#endif
/*
* SBIC is jammed
* DUNNO which direction
* Try old direction
*/
GET_SBIC_data(dev, i);
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_DBR) /* Wants us to write */
SET_SBIC_data(dev, i);
}
GET_SBIC_asr(dev, asr);
}
}
/*
* wait for last command to complete
*/
if (asr & SBIC_ASR_LCI) {
printf("sbicicmd: last command ignored\n");
}
else
if (still_busy >= SBIC_STATE_RUNNING) /* Bsy */
SBIC_WAIT (dev, SBIC_ASR_INT, sbic_cmd_wait);
/*
* do it again
*/
} while (still_busy >= SBIC_STATE_RUNNING && dev->sc_stat[0] == 0xff);
/*
* Sometimes we need to do an extra read of the CSR
*/
GET_SBIC_csr(dev, csr);
#ifdef DEBUG
if (data_pointer_debug)
printf("sbicicmd done(%d,%d):%d =%d=\n", dev->target, dev->lun,
acb->sc_kv.dc_count,
dev->sc_stat[0]);
#endif
dev->sc_flags &= ~SBICF_ICMD;
return(dev->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 sbicicmd except we
* skip (and don't allow) the select, cmd out and data in/out phases.
*/
void
sbicxfdone(dev)
struct sbic_softc *dev;
{
u_char phase,
csr;
int s;
QPRINTF(("{"));
s = splbio();
/*
* have the sbic complete on its own
*/
SBIC_TC_PUT(dev, 0);
SET_SBIC_cmd_phase(dev, 0x46);
SET_SBIC_cmd(dev, SBIC_CMD_SEL_ATN_XFER);
do {
SBIC_WAIT (dev, SBIC_ASR_INT, 0);
GET_SBIC_csr (dev, csr);
QPRINTF(("%02x:", csr));
} while ((csr != SBIC_CSR_DISC) && (csr != SBIC_CSR_DISC_1) &&
(csr != SBIC_CSR_S_XFERRED));
dev->sc_flags &= ~SBICF_SELECTED;
GET_SBIC_cmd_phase (dev, phase);
QPRINTF(("}%02x", phase));
if (phase == 0x60)
GET_SBIC_tlun(dev, dev->sc_stat[0]);
else
sbicerror(dev, csr);
QPRINTF(("=STS:%02x=\n", dev->sc_stat[0]));
splx(s);
}
/*
* No DMA chains
*/
int
sbicgo(dev, xs)
struct sbic_softc *dev;
struct scsipi_xfer *xs;
{
struct sbic_acb *acb = dev->sc_nexus;
int i,
count,
usedma;
u_char csr,
asr,
*addr;
dev->target = xs->xs_periph->periph_target;
dev->lun = xs->xs_periph->periph_lun;
usedma = sbicdmaok(dev, xs);
#ifdef DEBUG
if (data_pointer_debug)
printf("sbicgo(%d,%d): usedma=%d\n", dev->target, dev->lun, usedma);
#endif
/*
* select the SCSI bus (it's an error if bus isn't free)
*/
if ((csr = sbicselectbus(dev)) == 0)
return(0); /* Not done: needs to be rescheduled */
dev->sc_stat[0] = 0xff;
/*
* Calculate DMA chains now
*/
addr = acb->sc_kv.dc_addr;
count = acb->sc_kv.dc_count;
/*
* Allocate the DMA chain
* Mark end of segment...
*/
acb->sc_tcnt = dev->sc_tcnt = 0;
sbic_dma_setup(dev);
/*
* Enable interrupts but don't do any DMA
* enintr() also enables interrupts for the sbic
*/
dev->sc_enintr(dev);
dev->sc_tcnt = count;
dev->sc_usedma = usedma;
#ifdef DEBUG
dev->sc_dmatimo = dev->sc_tcnt ? 1 : 0;
#endif
acb->sc_usedma = dev->sc_usedma;
#ifdef DEBUG
if (data_pointer_debug) {
printf("sbicgo dmago:%d(%lx) dmacmd=0x%02x\n", dev->target,
dev->sc_tcnt,
dev->sc_usedma);
}
#endif
/*
* Lets cycle a while then let the interrupt handler take over.
*/
GET_SBIC_asr(dev, asr);
do {
QPRINTF(("go "));
/*
* Handle the new phase
*/
i = sbicnextstate(dev, csr, asr);
#if 0
WAIT_CIP(dev);
#endif
if (i == SBIC_STATE_RUNNING) {
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_LCI)
printf("sbicgo: LCI asr:%02x csr:%02x\n", asr, csr);
if (asr & SBIC_ASR_INT)
GET_SBIC_csr(dev, csr);
}
} while (i == SBIC_STATE_RUNNING && asr & (SBIC_ASR_INT|SBIC_ASR_LCI));
if (i == SBIC_STATE_DONE) {
if (dev->sc_stat[0] == 0xff)
#if 0
printf("sbicgo: done & stat = 0xff\n");
#else
;
#endif
else
return 1; /* Did we really finish that fast? */
}
return 0;
}
int
sbicintr(dev)
struct sbic_softc *dev;
{
u_char asr,
csr;
int i;
/*
* pending interrupt?
*/
GET_SBIC_asr (dev, asr);
if ((asr & SBIC_ASR_INT) == 0)
return(0);
GET_SBIC_csr(dev, csr);
do {
QPRINTF(("intr[0x%x]", csr));
i = sbicnextstate(dev, csr, asr);
#if 1
WAIT_CIP(dev);
#endif
if (i == SBIC_STATE_RUNNING) {
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_LCI)
printf("sbicgo: LCI asr:%02x csr:%02x\n", asr, csr);
if (asr & SBIC_ASR_INT)
GET_SBIC_csr(dev, csr);
}
} while (i == SBIC_STATE_RUNNING && asr & (SBIC_ASR_INT|SBIC_ASR_LCI));
QPRINTF(("intr done. state=%d, asr=0x%02x\n", i, asr));
return(1);
}
/*
* Run commands and wait for disconnect.
* This is only ever called when a command is in progress, when we
* want to busy wait for it to finish.
*/
int
sbicpoll(dev)
struct sbic_softc *dev;
{
u_char asr,
csr;
int i;
/*
* Wait for the next interrupt
*/
SBIC_WAIT(dev, SBIC_ASR_INT, sbic_cmd_wait);
do {
GET_SBIC_asr (dev, asr);
if (asr & SBIC_ASR_INT)
GET_SBIC_csr(dev, csr);
QPRINTF(("poll[0x%x]", csr));
/*
* Handle it
*/
i = sbicnextstate(dev, csr, asr);
WAIT_CIP(dev);
GET_SBIC_asr(dev, asr);
/*
* tapes may take a loooong time..
*/
while (asr & SBIC_ASR_BSY) {
u_char z = 0;
if (asr & SBIC_ASR_DBR) {
printf("sbipoll: Waiting while sbic is jammed, CSR:%02x,ASR:%02x\n", csr,asr);
#ifdef DDB
Debugger();
#endif
/*
* SBIC is jammed
* DUNNO which direction
* Try old direction
*/
GET_SBIC_data(dev, z);
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_DBR) /* Wants us to write */
SET_SBIC_data(dev, z);
}
GET_SBIC_asr(dev, asr);
}
if (asr & SBIC_ASR_LCI)
printf("sbicpoll: LCI asr:%02x csr:%02x\n", asr,csr);
else
if (i == SBIC_STATE_RUNNING) /* BSY */
SBIC_WAIT(dev, SBIC_ASR_INT, sbic_cmd_wait);
} while (i == SBIC_STATE_RUNNING);
return(1);
}
/*
* Handle a single msgin
*/
int
sbicmsgin(dev)
struct sbic_softc *dev;
{
int recvlen = 1;
u_char asr,
csr,
*tmpaddr,
*msgaddr;
tmpaddr = msgaddr = dev->sc_msg;
tmpaddr[0] = 0xff;
tmpaddr[1] = 0xff;
GET_SBIC_asr(dev, asr);
#ifdef DEBUG
if (reselect_debug)
printf("sbicmsgin asr=%02x\n", asr);
#endif
GET_SBIC_selid (dev, csr);
SET_SBIC_selid (dev, csr | SBIC_SID_FROM_SCSI);
SBIC_TC_PUT(dev, 0);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
do {
while( recvlen-- ) {
/*
* Fetch the next byte of the message
*/
RECV_BYTE(dev, *tmpaddr);
/*
* get the command completion interrupt, or we
* can't send a new command (LCI)
*/
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
GET_SBIC_csr(dev, csr);
#ifdef DEBUG
if (reselect_debug)
printf("sbicmsgin: got %02x csr %02x\n", *tmpaddr, csr);
#endif
tmpaddr++;
if (recvlen) {
/*
* Clear ACK, and wait for the interrupt for the next byte
*/
SET_SBIC_cmd(dev, SBIC_CMD_CLR_ACK);
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
GET_SBIC_csr(dev, csr);
}
}
if (msgaddr[0] == 0xff) {
printf("sbicmsgin: sbic swallowed our message\n");
break;
}
#ifdef DEBUG
if (sync_debug) {
GET_SBIC_asr(dev, asr);
printf("msgin done csr 0x%x asr 0x%x msg 0x%x\n", csr, asr, msgaddr[0]);
}
#endif
/*
* test whether this is a reply to our sync
* request
*/
if (MSG_ISIDENTIFY(msgaddr[0])) {
/*
* Got IFFY msg -- ack it
*/
QPRINTF(("IFFY"));
} else
if (msgaddr[0] == MSG_REJECT &&
dev->sc_sync[dev->target].state == SYNC_SENT) {
/*
* Target probably rejected our Sync negotiation.
*/
QPRINTF(("REJECT of SYN"));
#ifdef DEBUG
if (sync_debug)
printf("target %d rejected sync, going async\n", dev->target);
#endif
dev->sc_sync[dev->target].period = sbic_min_period;
dev->sc_sync[dev->target].offset = 0;
dev->sc_sync[dev->target].state = SYNC_DONE;
SET_SBIC_syn(dev, SBIC_SYN(dev->sc_sync[dev->target].offset,
dev->sc_sync[dev->target].period));
} else
if (msgaddr[0] == MSG_REJECT) {
/*
* we'll never REJECt a REJECT message..
*/
QPRINTF(("REJECT"));
} else
if (msgaddr[0] == MSG_SAVE_DATA_PTR) {
/*
* don't reject this either.
*/
QPRINTF(("MSG_SAVE_DATA_PTR"));
} else
if (msgaddr[0] == MSG_RESTORE_PTR) {
/*
* don't reject this either.
*/
QPRINTF(("MSG_RESTORE_PTR"));
} else
if (msgaddr[0] == MSG_DISCONNECT) {
/*
* Target is disconnecting...
*/
QPRINTF(("DISCONNECT"));
#ifdef DEBUG
if (reselect_debug && msgaddr[0] == MSG_DISCONNECT)
printf("sbicmsgin: got disconnect msg %s\n",
(dev->sc_flags & SBICF_ICMD) ? "rejecting" : "");
#endif
if (dev->sc_flags & SBICF_ICMD) {
/*
* We're in immediate mode. Prevent disconnects.
* prepare to reject the message, NACK
*/
SET_SBIC_cmd(dev, SBIC_CMD_SET_ATN);
WAIT_CIP(dev);
}
} else
if (msgaddr[0] == MSG_CMD_COMPLETE) {
/*
* !! KLUDGE ALERT !! quite a few drives don't seem to
* really like the current way of sending the
* sync-handshake together with the ident-message, and
* they react by sending command-complete and
* disconnecting right after returning the valid sync
* handshake. So, all I can do is reselect the drive,
* and hope it won't disconnect again. I don't think
* this is valid behavior, but I can't help fixing a
* problem that apparently exists.
*
* Note: we should not get here on `normal' command
* completion, as that condition is handled by the
* high-level sel&xfer resume command used to walk
* thru status/cc-phase.
*/
QPRINTF(("CMD_COMPLETE"));
#ifdef DEBUG
if (sync_debug)
printf ("GOT MSG %d! target %d acting weird.."
" waiting for disconnect...\n", msgaddr[0], dev->target);
#endif
/*
* Check to see if sbic is handling this
*/
GET_SBIC_asr(dev, asr);
/*
* XXXSCW: I'm not convinced of this, we haven't negated ACK yet...
*/
if (asr & SBIC_ASR_BSY)
return SBIC_STATE_RUNNING;
/*
* Let's try this: Assume it works and set status to 00
*/
dev->sc_stat[0] = 0;
} else
if (msgaddr[0] == MSG_EXT_MESSAGE && tmpaddr == &(msgaddr[1])) {
/*
* Target is sending us an extended message. We'll assume it's
* the response to our Sync. negotiation.
*/
QPRINTF(("ExtMSG\n"));
/*
* Read in whole extended message. First, negate ACK to accept
* the MSG_EXT_MESSAGE byte...
*/
SET_SBIC_cmd(dev, SBIC_CMD_CLR_ACK);
/*
* Wait for the interrupt for the next byte (length)
*/
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
GET_SBIC_csr(dev, csr);
#ifdef DEBUG
QPRINTF(("CLR ACK csr %02x\n", csr));
#endif
/*
* Read the length byte
*/
RECV_BYTE(dev, *tmpaddr);
/*
* Wait for command completion IRQ
*/
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
GET_SBIC_csr(dev, csr);
/*
* Reload the loop counter
*/
recvlen = *tmpaddr++;
QPRINTF(("Recving ext msg, csr %02x len %02x\n", csr, recvlen));
} else
if (msgaddr[0] == MSG_EXT_MESSAGE && msgaddr[1] == 3 &&
msgaddr[2] == MSG_SYNC_REQ) {
/*
* We've received the complete Extended Message Sync. Request...
*/
QPRINTF(("SYN"));
/*
* Compute the required Transfer Period for the WD chip...
*/
dev->sc_sync[dev->target].period = sbicfromscsiperiod(dev, msgaddr[3]);
dev->sc_sync[dev->target].offset = msgaddr[4];
dev->sc_sync[dev->target].state = SYNC_DONE;
/*
* Put the WD chip in synchronous mode
*/
SET_SBIC_syn(dev, SBIC_SYN(dev->sc_sync[dev->target].offset,
dev->sc_sync[dev->target].period));
#ifdef DEBUG
if (sync_debug)
printf("msgin(%d): sync reg = 0x%02x\n", dev->target,
SBIC_SYN(dev->sc_sync[dev->target].offset,
dev->sc_sync[dev->target].period));
#endif
printf("%s: target %d now synchronous, period=%dns, offset=%d.\n",
dev->sc_dev.dv_xname, dev->target,
msgaddr[3] * 4, msgaddr[4]);
} else {
/*
* We don't support whatever this message is...
*/
#ifdef DEBUG
if (sbic_debug || sync_debug)
printf ("sbicmsgin: Rejecting message 0x%02x\n", msgaddr[0]);
#endif
/*
* prepare to reject the message, NACK
*/
SET_SBIC_cmd(dev, SBIC_CMD_SET_ATN);
WAIT_CIP(dev);
}
/*
* Negate ACK to complete the transfer
*/
SET_SBIC_cmd(dev, SBIC_CMD_CLR_ACK);
/*
* Wait for the interrupt for the next byte, or phase change.
* Only read the CSR if we have more data to transfer.
* XXXSCW: We should really verify that we're still in MSG IN phase
* before blindly going back around this loop, but that would mean
* we read the CSR... <sigh>
*/
SBIC_WAIT(dev, SBIC_ASR_INT, 0);
if (recvlen > 0)
GET_SBIC_csr(dev, csr);
} while (recvlen > 0);
/*
* Should still have one CSR to read
*/
return SBIC_STATE_RUNNING;
}
/*
* sbicnextstate()
* return:
* SBIC_STATE_DONE == done
* SBIC_STATE_RUNNING == working
* SBIC_STATE_DISCONNECT == disconnected
* SBIC_STATE_ERROR == error
*/
int
sbicnextstate(dev, csr, asr)
struct sbic_softc *dev;
u_char csr,
asr;
{
struct sbic_acb *acb = dev->sc_nexus;
QPRINTF(("next[%02x,%02x]: ",asr,csr));
switch (csr) {
case SBIC_CSR_XFERRED | CMD_PHASE:
case SBIC_CSR_MIS | CMD_PHASE:
case SBIC_CSR_MIS_1 | CMD_PHASE:
case SBIC_CSR_MIS_2 | CMD_PHASE:
{
if (sbicxfout(dev, acb->clen, &acb->cmd))
goto abort;
}
break;
case SBIC_CSR_XFERRED | STATUS_PHASE:
case SBIC_CSR_MIS | STATUS_PHASE:
case SBIC_CSR_MIS_1 | STATUS_PHASE:
case SBIC_CSR_MIS_2 | STATUS_PHASE:
{
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
/*
* this should be the normal i/o completion case.
* get the status & cmd complete msg then let the
* device driver look at what happened.
*/
sbicxfdone(dev);
#ifdef DEBUG
dev->sc_dmatimo = 0;
if (data_pointer_debug)
printf("next dmastop: %d(%lx)\n", dev->target,
dev->sc_tcnt);
#endif
/*
* Stop the DMA chip
*/
dev->sc_dmastop(dev);
dev->sc_flags &= ~(SBICF_INDMA | SBICF_DCFLUSH);
/*
* Indicate to the upper layers that the command is done
*/
sbic_scsidone(acb, dev->sc_stat[0]);
return SBIC_STATE_DONE;
}
case SBIC_CSR_XFERRED | DATA_OUT_PHASE:
case SBIC_CSR_XFERRED | DATA_IN_PHASE:
case SBIC_CSR_MIS | DATA_OUT_PHASE:
case SBIC_CSR_MIS | DATA_IN_PHASE:
case SBIC_CSR_MIS_1 | DATA_OUT_PHASE:
case SBIC_CSR_MIS_1 | DATA_IN_PHASE:
case SBIC_CSR_MIS_2 | DATA_OUT_PHASE:
case SBIC_CSR_MIS_2 | DATA_IN_PHASE:
{
/*
* Verify that we expected to transfer data...
*/
if (acb->sc_kv.dc_count <= 0) {
printf("next: DATA phase with xfer count == %d, asr:0x%02x csr:0x%02x\n",
acb->sc_kv.dc_count, asr, csr);
goto abort;
}
/*
* Should we transfer using PIO or DMA ?
*/
if (sbic_no_dma || dev->sc_xs->xs_control & XS_CTL_POLL ||
dev->sc_flags & SBICF_ICMD || acb->sc_usedma == 0) {
/*
* Do PIO transfer
*/
int i;
#ifdef DEBUG
if (data_pointer_debug)
printf("next PIO: %d(%p:%x)\n", dev->target,
acb->sc_kv.dc_addr,
acb->sc_kv.dc_count);
#endif
if (SBIC_PHASE(csr) == DATA_IN_PHASE)
/*
* data in
*/
i = sbicxfin(dev, acb->sc_kv.dc_count,
acb->sc_kv.dc_addr);
else
/*
* data out
*/
i = sbicxfout(dev, acb->sc_kv.dc_count,
acb->sc_kv.dc_addr);
acb->sc_kv.dc_addr += (acb->sc_kv.dc_count - i);
acb->sc_kv.dc_count = i;
/*
* Update current count...
*/
acb->sc_tcnt = dev->sc_tcnt = i;
dev->sc_flags &= ~SBICF_INDMA;
} else {
/*
* Do DMA transfer
* set next dma addr and dec count
*/
sbic_dma_stop(dev);
sbic_dma_setup(dev);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI |
SBIC_CTL_DMA);
#ifdef DEBUG
dev->sc_dmatimo = 1;
if (data_pointer_debug)
printf("next DMA: %d(%lx)\n", dev->target,
dev->sc_tcnt);
#endif
/*
* Start the DMA chip going
*/
dev->sc_tcnt = dev->sc_dmago(dev);
/*
* Tell the WD chip how much to transfer this time around
*/
SBIC_TC_PUT(dev, (unsigned)dev->sc_tcnt);
/*
* Start the transfer
*/
SET_SBIC_cmd(dev, SBIC_CMD_XFER_INFO);
/*
* Indicate that we're in DMA mode
*/
dev->sc_flags |= SBICF_INDMA;
}
}
break;
case SBIC_CSR_XFERRED | MESG_IN_PHASE:
case SBIC_CSR_MIS | MESG_IN_PHASE:
case SBIC_CSR_MIS_1 | MESG_IN_PHASE:
case SBIC_CSR_MIS_2 | MESG_IN_PHASE:
{
sbic_dma_stop(dev);
/*
* Handle a single message in...
*/
return sbicmsgin(dev);
}
case SBIC_CSR_MSGIN_W_ACK:
{
/*
* We should never see this since it's handled in 'sbicmsgin()'
* but just for the sake of paranoia...
*/
SET_SBIC_cmd(dev, SBIC_CMD_CLR_ACK); /* Dunno what I'm ACKing */
printf("Acking unknown msgin CSR:%02x",csr);
}
break;
case SBIC_CSR_XFERRED | MESG_OUT_PHASE:
case SBIC_CSR_MIS | MESG_OUT_PHASE:
case SBIC_CSR_MIS_1 | MESG_OUT_PHASE:
case SBIC_CSR_MIS_2 | MESG_OUT_PHASE:
{
/*
* We only ever handle a message out phase here for sending a
* REJECT message.
*/
sbic_dma_stop(dev);
#ifdef DEBUG
if (sync_debug)
printf ("sending REJECT msg to last msg.\n");
#endif
SEND_BYTE(dev, MSG_REJECT);
WAIT_CIP(dev);
}
break;
case SBIC_CSR_DISC:
case SBIC_CSR_DISC_1:
{
/*
* Try to schedule another target
*/
sbic_dma_stop(dev);
dev->sc_flags &= ~SBICF_SELECTED;
#ifdef DEBUG
if (reselect_debug)
printf("sbicnext target %d disconnected\n", dev->target);
#endif
TAILQ_INSERT_HEAD(&dev->nexus_list, acb, chain);
++dev->sc_tinfo[dev->target].dconns;
dev->sc_nexus = NULL;
dev->sc_xs = NULL;
if (sbic_no_dma || acb->xs->xs_control & XS_CTL_POLL ||
dev->sc_flags & SBICF_ICMD || !sbic_parallel_operations)
return SBIC_STATE_DISCONNECT;
QPRINTF(("sbicnext: calling sbic_sched\n"));
sbic_sched(dev);
QPRINTF(("sbicnext: sbic_sched returned\n"));
return SBIC_STATE_DISCONNECT;
}
case SBIC_CSR_RSLT_NI:
case SBIC_CSR_RSLT_IFY:
{
/*
* A reselection.
* Note that since we don't enable Advanced Features (assuming
* the WD chip is at least the 'A' revision), we're only ever
* likely to see the 'SBIC_CSR_RSLT_NI' status. But for the
* hell of it, we'll handle it anyway, for all the extra code
* it needs...
*/
u_char newtarget,
newlun;
GET_SBIC_rselid(dev, newtarget);
/*
* check SBIC_RID_SIV?
*/
newtarget &= SBIC_RID_MASK;
if (csr == SBIC_CSR_RSLT_IFY) {
/*
* Read Identify msg to avoid lockup
*/
GET_SBIC_data(dev, newlun);
WAIT_CIP(dev);
newlun &= SBIC_TLUN_MASK;
} else {
/*
* Need to read Identify message the hard way, assuming
* the target even sends us one...
*/
for (newlun = 255; newlun; --newlun) {
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_INT)
break;
delay(10);
}
/*
* If we didn't get an interrupt, somethink's up
*/
if ((asr & SBIC_ASR_INT) == 0) {
printf("%s: Reselect without identify? asr %x\n",
dev->sc_dev.dv_xname, asr);
newlun = 0; /* XXXX */
} else {
/*
* We got an interrupt, verify that it's a change to
* message in phase, and if so read the message.
*/
GET_SBIC_csr(dev,csr);
if (csr == (SBIC_CSR_MIS | MESG_IN_PHASE) ||
csr == (SBIC_CSR_MIS_1 | MESG_IN_PHASE) ||
csr == (SBIC_CSR_MIS_2 | MESG_IN_PHASE)) {
/*
* Yup, gone to message in. Fetch the target LUN
*/
sbicmsgin(dev);
newlun = dev->sc_msg[0] & 0x07;
} else {
/*
* Whoops! Target didn't go to message in phase!!
*/
printf("RSLT_NI - not MESG_IN_PHASE %x\n", csr);
newlun = 0; /* XXXSCW */
}
}
}
/*
* Ok, we have the identity of the reselecting target.
*/
#ifdef DEBUG
if (reselect_debug ||
(reselect_debug && csr == SBIC_CSR_RSLT_NI) ) {
printf("sbicnext: reselect %s from targ %d lun %d\n",
csr == SBIC_CSR_RSLT_NI ? "NI" : "IFY",
newtarget, newlun);
}
#endif
if (dev->sc_nexus) {
/*
* Whoops! We've been reselected with an command in progress!
* The best we can do is to put the current command back on the
* ready list and hope for the best.
*/
#ifdef DEBUG
if (reselect_debug) {
printf("%s: reselect %s with active command\n",
dev->sc_dev.dv_xname,
csr == SBIC_CSR_RSLT_NI ? "NI" : "IFY");
}
#endif
TAILQ_INSERT_HEAD(&dev->ready_list, dev->sc_nexus, chain);
dev->sc_tinfo[dev->target].lubusy &= ~(1 << dev->lun);
dev->sc_nexus = NULL;
dev->sc_xs = NULL;
}
/*
* Reload sync values for this target
*/
if (dev->sc_sync[newtarget].state == SYNC_DONE)
SET_SBIC_syn(dev, SBIC_SYN (dev->sc_sync[newtarget].offset,
dev->sc_sync[newtarget].period));
else
SET_SBIC_syn(dev, SBIC_SYN (0, sbic_min_period));
/*
* Loop through the nexus list until we find the saved entry
* for the reselecting target...
*/
for (acb = dev->nexus_list.tqh_first; acb;
acb = acb->chain.tqe_next) {
if (acb->xs->xs_periph->periph_target == newtarget &&
acb->xs->xs_periph->periph_lun == newlun) {
/*
* We've found the saved entry. Dequeue it, and
* make it current again.
*/
TAILQ_REMOVE(&dev->nexus_list, acb, chain);
dev->sc_nexus = acb;
dev->sc_xs = acb->xs;
dev->sc_flags |= SBICF_SELECTED;
dev->target = newtarget;
dev->lun = newlun;
break;
}
}
if (acb == NULL) {
printf("%s: reselect %s targ %d not in nexus_list %p\n",
dev->sc_dev.dv_xname,
csr == SBIC_CSR_RSLT_NI ? "NI" : "IFY", newtarget,
&dev->nexus_list.tqh_first);
panic("bad reselect in sbic");
}
if (csr == SBIC_CSR_RSLT_IFY)
SET_SBIC_cmd(dev, SBIC_CMD_CLR_ACK);
}
break;
default:
abort:
{
/*
* Something unexpected happened -- deal with it.
*/
printf("next: aborting asr 0x%02x csr 0x%02x\n", asr, csr);
#ifdef DDB
Debugger();
#endif
#ifdef DEBUG
dev->sc_dmatimo = 0;
if (data_pointer_debug)
printf("next dmastop: %d(%lx)\n", dev->target,
dev->sc_tcnt);
#endif
dev->sc_dmastop(dev);
SET_SBIC_control(dev, SBIC_CTL_EDI | SBIC_CTL_IDI);
if (dev->sc_xs)
sbicerror(dev, csr);
sbicabort(dev, "next");
if (dev->sc_flags & SBICF_INDMA) {
dev->sc_flags &= ~(SBICF_INDMA | SBICF_DCFLUSH);
#ifdef DEBUG
dev->sc_dmatimo = 0;
if (data_pointer_debug)
printf("next dmastop: %d(%lx)\n", dev->target,
dev->sc_tcnt);
#endif
sbic_scsidone(acb, -1);
}
return SBIC_STATE_ERROR;
}
}
return(SBIC_STATE_RUNNING);
}
int
sbictoscsiperiod(dev, a)
struct sbic_softc *dev;
int a;
{
unsigned int fs;
/*
* cycle = DIV / (2 * CLK)
* DIV = FS + 2
* best we can do is 200ns at 20Mhz, 2 cycles
*/
GET_SBIC_myid(dev, fs);
fs = (fs >> 6) + 2; /* DIV */
fs = (fs * 10000) / (dev->sc_clkfreq << 1); /* Cycle, in ns */
if (a < 2)
a = 8; /* map to Cycles */
return ((fs * a) >> 2); /* in 4 ns units */
}
int
sbicfromscsiperiod(dev, p)
struct sbic_softc *dev;
int p;
{
unsigned fs,
ret;
/*
* Just the inverse of the above
*/
GET_SBIC_myid(dev, fs);
fs = (fs >> 6) + 2; /* DIV */
fs = (fs * 10000) / (dev->sc_clkfreq << 1); /* Cycle, in ns */
ret = p << 2; /* in ns units */
ret = ret / fs; /* in Cycles */
if (ret < sbic_min_period)
return(sbic_min_period);
/*
* verify rounding
*/
if (sbictoscsiperiod(dev, ret) < p)
ret++;
return((ret >= 8) ? 0 : ret);
}
#ifdef DEBUG
void
sbictimeout(dev)
struct sbic_softc *dev;
{
int s,
asr;
s = splbio();
if (dev->sc_dmatimo) {
if (dev->sc_dmatimo > 1) {
printf("%s: dma timeout #%d\n", dev->sc_dev.dv_xname,
dev->sc_dmatimo - 1);
GET_SBIC_asr(dev, asr);
if (asr & SBIC_ASR_INT) {
/*
* We need to service a missed IRQ
*/
sbicintr(dev);
} else {
(void) sbicabort(dev, "timeout");
splx(s);
return;
}
}
dev->sc_dmatimo++;
}
splx(s);
callout_reset(&dev->sc_timo_ch, 30 * hz, (void *)sbictimeout, dev);
}
#endif
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