NetBSD/sys/dev/ic/uha.c

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/* $NetBSD: uha.c,v 1.5 1996/11/15 22:53:36 jonathan Exp $ */
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#undef UHADEBUG
#ifdef DDB
#define integrate
#else
#define integrate static inline
#endif
/*
* Copyright (c) 1994, 1996 Charles M. Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Ported for use with the UltraStor 14f by Gary Close (gclose@wvnvms.wvnet.edu)
* Slight fixes to timeouts to run with the 34F
* Thanks to Julian Elischer for advice and help with this port.
*
* Originally written by Julian Elischer (julian@tfs.com)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* commenced: Sun Sep 27 18:14:01 PDT 1992
* slight mod to make work with 34F as well: Wed Jun 2 18:05:48 WST 1993
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <dev/ic/uhareg.h>
#include <dev/ic/uhavar.h>
#ifndef DDB
#define Debugger() panic("should call debugger here (uha.c)")
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#endif /* ! DDB */
#define KVTOPHYS(x) vtophys(x)
integrate void uha_reset_mscp __P((struct uha_softc *, struct uha_mscp *));
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void uha_free_mscp __P((struct uha_softc *, struct uha_mscp *));
integrate void uha_init_mscp __P((struct uha_softc *, struct uha_mscp *));
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struct uha_mscp *uha_get_mscp __P((struct uha_softc *, int));
void uhaminphys __P((struct buf *));
int uha_scsi_cmd __P((struct scsi_xfer *));
struct scsi_adapter uha_switch = {
uha_scsi_cmd,
uhaminphys,
0,
0,
};
/* the below structure is so we have a default dev struct for out link struct */
struct scsi_device uha_dev = {
NULL, /* Use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* Use default 'done' routine */
};
struct cfdriver uha_cd = {
NULL, "uha", DV_DULL
};
#define UHA_ABORT_TIMEOUT 2000 /* time to wait for abort (mSec) */
/*
* Attach all the sub-devices we can find
*/
void
uha_attach(sc)
struct uha_softc *sc;
{
(sc->init)(sc);
TAILQ_INIT(&sc->sc_free_mscp);
/*
* fill in the prototype scsi_link.
*/
sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE;
sc->sc_link.adapter_softc = sc;
sc->sc_link.adapter_target = sc->sc_scsi_dev;
sc->sc_link.adapter = &uha_switch;
sc->sc_link.device = &uha_dev;
sc->sc_link.openings = 2;
/*
* ask the adapter what subunits are present
*/
config_found(&sc->sc_dev, &sc->sc_link, scsiprint);
}
integrate void
uha_reset_mscp(sc, mscp)
struct uha_softc *sc;
struct uha_mscp *mscp;
{
mscp->flags = 0;
}
/*
* A mscp (and hence a mbx-out) is put onto the free list.
*/
void
uha_free_mscp(sc, mscp)
struct uha_softc *sc;
struct uha_mscp *mscp;
{
int s;
s = splbio();
uha_reset_mscp(sc, mscp);
TAILQ_INSERT_HEAD(&sc->sc_free_mscp, mscp, chain);
/*
* If there were none, wake anybody waiting for one to come free,
* starting with queued entries.
*/
if (mscp->chain.tqe_next == 0)
wakeup(&sc->sc_free_mscp);
splx(s);
}
integrate void
uha_init_mscp(sc, mscp)
struct uha_softc *sc;
struct uha_mscp *mscp;
{
int hashnum;
bzero(mscp, sizeof(struct uha_mscp));
/*
* put in the phystokv hash table
* Never gets taken out.
*/
mscp->hashkey = KVTOPHYS(mscp);
hashnum = MSCP_HASH(mscp->hashkey);
mscp->nexthash = sc->sc_mscphash[hashnum];
sc->sc_mscphash[hashnum] = mscp;
uha_reset_mscp(sc, mscp);
}
/*
* Get a free mscp
*
* If there are none, see if we can allocate a new one. If so, put it in the
* hash table too otherwise either return an error or sleep.
*/
struct uha_mscp *
uha_get_mscp(sc, flags)
struct uha_softc *sc;
int flags;
{
struct uha_mscp *mscp;
int s;
s = splbio();
/*
* If we can and have to, sleep waiting for one to come free
* but only if we can't allocate a new one
*/
for (;;) {
mscp = sc->sc_free_mscp.tqh_first;
if (mscp) {
TAILQ_REMOVE(&sc->sc_free_mscp, mscp, chain);
break;
}
if (sc->sc_nummscps < UHA_MSCP_MAX) {
mscp = (struct uha_mscp *) malloc(sizeof(struct uha_mscp),
M_TEMP, M_NOWAIT);
if (!mscp) {
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printf("%s: can't malloc mscp\n",
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sc->sc_dev.dv_xname);
goto out;
}
uha_init_mscp(sc, mscp);
sc->sc_nummscps++;
break;
}
if ((flags & SCSI_NOSLEEP) != 0)
goto out;
tsleep(&sc->sc_free_mscp, PRIBIO, "uhamsc", 0);
}
mscp->flags |= MSCP_ALLOC;
out:
splx(s);
return (mscp);
}
/*
* given a physical address, find the mscp that it corresponds to.
*/
struct uha_mscp *
uha_mscp_phys_kv(sc, mscp_phys)
struct uha_softc *sc;
u_long mscp_phys;
{
int hashnum = MSCP_HASH(mscp_phys);
struct uha_mscp *mscp = sc->sc_mscphash[hashnum];
while (mscp) {
if (mscp->hashkey == mscp_phys)
break;
mscp = mscp->nexthash;
}
return (mscp);
}
/*
* We have a mscp which has been processed by the adaptor, now we look to see
* how the operation went.
*/
void
uha_done(sc, mscp)
struct uha_softc *sc;
struct uha_mscp *mscp;
{
struct scsi_sense_data *s1, *s2;
struct scsi_xfer *xs = mscp->xs;
SC_DEBUG(xs->sc_link, SDEV_DB2, ("uha_done\n"));
/*
* Otherwise, put the results of the operation
* into the xfer and call whoever started it
*/
if ((mscp->flags & MSCP_ALLOC) == 0) {
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printf("%s: exiting ccb not allocated!\n", sc->sc_dev.dv_xname);
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Debugger();
return;
}
if (xs->error == XS_NOERROR) {
if (mscp->host_stat != UHA_NO_ERR) {
switch (mscp->host_stat) {
case UHA_SBUS_TIMEOUT: /* No response */
xs->error = XS_SELTIMEOUT;
break;
default: /* Other scsi protocol messes */
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printf("%s: host_stat %x\n",
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sc->sc_dev.dv_xname, mscp->host_stat);
xs->error = XS_DRIVER_STUFFUP;
}
} else if (mscp->target_stat != SCSI_OK) {
switch (mscp->target_stat) {
case SCSI_CHECK:
s1 = &mscp->mscp_sense;
s2 = &xs->sense;
*s2 = *s1;
xs->error = XS_SENSE;
break;
case SCSI_BUSY:
xs->error = XS_BUSY;
break;
default:
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printf("%s: target_stat %x\n",
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sc->sc_dev.dv_xname, mscp->target_stat);
xs->error = XS_DRIVER_STUFFUP;
}
} else
xs->resid = 0;
}
uha_free_mscp(sc, mscp);
xs->flags |= ITSDONE;
scsi_done(xs);
}
void
uhaminphys(bp)
struct buf *bp;
{
if (bp->b_bcount > ((UHA_NSEG - 1) << PGSHIFT))
bp->b_bcount = ((UHA_NSEG - 1) << PGSHIFT);
minphys(bp);
}
/*
* start a scsi operation given the command and the data address. Also
* needs the unit, target and lu.
*/
int
uha_scsi_cmd(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct uha_softc *sc = sc_link->adapter_softc;
struct uha_mscp *mscp;
struct uha_dma_seg *sg;
int seg; /* scatter gather seg being worked on */
u_long thiskv, thisphys, nextphys;
int bytes_this_seg, bytes_this_page, datalen, flags;
int s;
SC_DEBUG(sc_link, SDEV_DB2, ("uha_scsi_cmd\n"));
/*
* get a mscp (mbox-out) to use. If the transfer
* is from a buf (possibly from interrupt time)
* then we can't allow it to sleep
*/
flags = xs->flags;
if ((mscp = uha_get_mscp(sc, flags)) == NULL) {
xs->error = XS_DRIVER_STUFFUP;
return (TRY_AGAIN_LATER);
}
mscp->xs = xs;
mscp->timeout = xs->timeout;
/*
* Put all the arguments for the xfer in the mscp
*/
if (flags & SCSI_RESET) {
mscp->opcode = UHA_SDR;
mscp->ca = 0x01;
} else {
mscp->opcode = UHA_TSP;
/* XXX Not for tapes. */
mscp->ca = 0x01;
bcopy(xs->cmd, &mscp->scsi_cmd, mscp->scsi_cmd_length);
}
mscp->xdir = UHA_SDET;
mscp->dcn = 0x00;
mscp->chan = 0x00;
mscp->target = sc_link->target;
mscp->lun = sc_link->lun;
mscp->scsi_cmd_length = xs->cmdlen;
mscp->sense_ptr = KVTOPHYS(&mscp->mscp_sense);
mscp->req_sense_length = sizeof(mscp->mscp_sense);
mscp->host_stat = 0x00;
mscp->target_stat = 0x00;
if (xs->datalen) {
sg = mscp->uha_dma;
seg = 0;
#ifdef TFS
if (flags & SCSI_DATA_UIO) {
struct iovec *iovp;
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iovp = ((struct uio *) xs->data)->uio_iov;
datalen = ((struct uio *) xs->data)->uio_iovcnt;
xs->datalen = 0;
while (datalen && seg < UHA_NSEG) {
sg->seg_addr = (physaddr)iovp->iov_base;
sg->seg_len = iovp->iov_len;
xs->datalen += iovp->iov_len;
SC_DEBUGN(sc_link, SDEV_DB4, ("(0x%x@0x%x)",
iovp->iov_len, iovp->iov_base));
sg++;
iovp++;
seg++;
datalen--;
}
} else
#endif /*TFS */
{
/*
* Set up the scatter gather block
*/
SC_DEBUG(sc_link, SDEV_DB4,
("%d @0x%x:- ", xs->datalen, xs->data));
datalen = xs->datalen;
thiskv = (int) xs->data;
thisphys = KVTOPHYS(thiskv);
while (datalen && seg < UHA_NSEG) {
bytes_this_seg = 0;
/* put in the base address */
sg->seg_addr = thisphys;
SC_DEBUGN(sc_link, SDEV_DB4, ("0x%x", thisphys));
/* do it at least once */
nextphys = thisphys;
while (datalen && thisphys == nextphys) {
/*
* This page is contiguous (physically)
* with the the last, just extend the
* length
*/
/* how far to the end of the page */
nextphys = (thisphys & ~PGOFSET) + NBPG;
bytes_this_page = nextphys - thisphys;
/**** or the data ****/
bytes_this_page = min(bytes_this_page,
datalen);
bytes_this_seg += bytes_this_page;
datalen -= bytes_this_page;
/* get more ready for the next page */
thiskv = (thiskv & ~PGOFSET) + NBPG;
if (datalen)
thisphys = KVTOPHYS(thiskv);
}
/*
* next page isn't contiguous, finish the seg
*/
SC_DEBUGN(sc_link, SDEV_DB4,
("(0x%x)", bytes_this_seg));
sg->seg_len = bytes_this_seg;
sg++;
seg++;
}
}
/* end of iov/kv decision */
SC_DEBUGN(sc_link, SDEV_DB4, ("\n"));
if (datalen) {
/*
* there's still data, must have run out of segs!
*/
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printf("%s: uha_scsi_cmd, more than %d dma segs\n",
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sc->sc_dev.dv_xname, UHA_NSEG);
goto bad;
}
mscp->data_addr = KVTOPHYS(mscp->uha_dma);
mscp->data_length = xs->datalen;
mscp->sgth = 0x01;
mscp->sg_num = seg;
} else { /* No data xfer, use non S/G values */
mscp->data_addr = (physaddr)0;
mscp->data_length = 0;
mscp->sgth = 0x00;
mscp->sg_num = 0;
}
mscp->link_id = 0;
mscp->link_addr = (physaddr)0;
s = splbio();
(sc->start_mbox)(sc, mscp);
splx(s);
/*
* Usually return SUCCESSFULLY QUEUED
*/
if ((flags & SCSI_POLL) == 0)
return (SUCCESSFULLY_QUEUED);
/*
* If we can't use interrupts, poll on completion
*/
if ((sc->poll)(sc, xs, mscp->timeout)) {
uha_timeout(mscp);
if ((sc->poll)(sc, xs, mscp->timeout))
uha_timeout(mscp);
}
return (COMPLETE);
bad:
xs->error = XS_DRIVER_STUFFUP;
uha_free_mscp(sc, mscp);
return (COMPLETE);
}
void
uha_timeout(arg)
void *arg;
{
struct uha_mscp *mscp = arg;
struct scsi_xfer *xs = mscp->xs;
struct scsi_link *sc_link = xs->sc_link;
struct uha_softc *sc = sc_link->adapter_softc;
int s;
sc_print_addr(sc_link);
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printf("timed out");
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s = splbio();
if (mscp->flags & MSCP_ABORT) {
/* abort timed out */
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printf(" AGAIN\n");
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/* XXX Must reset! */
} else {
/* abort the operation that has timed out */
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printf("\n");
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mscp->xs->error = XS_TIMEOUT;
mscp->timeout = UHA_ABORT_TIMEOUT;
mscp->flags |= MSCP_ABORT;
(sc->start_mbox)(sc, mscp);
}
splx(s);
}