/*
* Copyright (c) 2000 Manuel Bouyer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
*
*/
/* Do a bus reset, so that devices fall back to narrow/async */
siop_resetbus(&sc->sc_c);
/*
* siop_reset() will reset the chip, thus clearing pending interrupts
*/
siop_reset(sc);
#ifdef SIOP_DUMP_SCRIPT
siop_dump_script(sc);
#endif
if (dstat & ~(DSTAT_SIR | DSTAT_DFE | DSTAT_SSI)) {
printf("DMA IRQ:");
if (dstat & DSTAT_IID)
printf(" Illegal instruction");
if (dstat & DSTAT_BF)
printf(" bus fault");
if (dstat & DSTAT_MDPE)
printf(" parity");
if (dstat & DSTAT_DFE)
printf(" DMA fifo empty");
else
siop_clearfifo(&sc->sc_c);
printf(", DSP=0x%x DSA=0x%x: ",
(int)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP) - sc->sc_c.sc_scriptaddr),
bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA));
if (siop_cmd)
printf("last msg_in=0x%x status=0x%x\n",
siop_cmd->cmd_tables->msg_in[0],
siop_ctoh32(&sc->sc_c,
siop_cmd->cmd_tables->status));
else
aprint_error_dev(sc->sc_c.sc_dev,
"current DSA invalid\n");
need_reset = 1;
}
}
if (istat & ISTAT_SIP) {
if (istat & ISTAT_DIP)
delay(10);
/*
* Can't read sist0 & sist1 independently, or we have to
* insert delay
*/
sist = bus_space_read_2(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SIST0);
sstat1 = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SSTAT1);
#ifdef SIOP_DEBUG_INTR
printf("scsi interrupt, sist=0x%x sstat1=0x%x "
"DSA=0x%x DSP=0x%lx\n", sist,
bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SSTAT1),
bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA),
(u_long)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP) -
sc->sc_c.sc_scriptaddr));
#endif
if (sist & SIST0_RST) {
siop_handle_reset(sc);
/* no table to flush here */
return 1;
}
if (sist & SIST0_SGE) {
if (siop_cmd)
scsipi_printaddr(xs->xs_periph);
else
printf("%s:", device_xname(sc->sc_c.sc_dev));
printf("scsi gross error\n");
goto reset;
}
if ((sist & SIST0_MA) && need_reset == 0) {
if (siop_cmd) {
int scratcha0;
dstat = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_DSTAT);
/*
* first restore DSA, in case we were in a S/G
* operation.
*/
bus_space_write_4(sc->sc_c.sc_rt,
sc->sc_c.sc_rh,
SIOP_DSA, siop_cmd->cmd_c.dsa);
scratcha0 = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA);
switch (sstat1 & SSTAT1_PHASE_MASK) {
case SSTAT1_PHASE_STATUS:
/*
* previous phase may be aborted for any reason
* ( for example, the target has less data to
* transfer than requested). Compute resid and
* just go to status, the command should
* terminate.
*/
INCSTAT(siop_stat_intr_shortxfer);
if (scratcha0 & A_flag_data)
siop_ma(&siop_cmd->cmd_c);
else if ((dstat & DSTAT_DFE) == 0)
siop_clearfifo(&sc->sc_c);
CALL_SCRIPT(Ent_status);
return 1;
case SSTAT1_PHASE_MSGIN:
/*
* target may be ready to disconnect
* Compute resid which would be used later
* if a save data pointer is needed.
*/
INCSTAT(siop_stat_intr_xferdisc);
if (scratcha0 & A_flag_data)
siop_ma(&siop_cmd->cmd_c);
else if ((dstat & DSTAT_DFE) == 0)
siop_clearfifo(&sc->sc_c);
bus_space_write_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA,
scratcha0 & ~A_flag_data);
CALL_SCRIPT(Ent_msgin);
return 1;
}
aprint_error_dev(sc->sc_c.sc_dev,
"unexpected phase mismatch %d\n",
sstat1 & SSTAT1_PHASE_MASK);
} else {
aprint_error_dev(sc->sc_c.sc_dev,
"phase mismatch without command\n");
}
need_reset = 1;
}
if (sist & SIST0_PAR) {
/* parity error, reset */
if (siop_cmd)
scsipi_printaddr(xs->xs_periph);
else
printf("%s:", device_xname(sc->sc_c.sc_dev));
printf("parity error\n");
goto reset;
}
if ((sist & (SIST1_STO << 8)) && need_reset == 0) {
/* selection time out, assume there's no device here */
if (siop_cmd) {
siop_cmd->cmd_c.status = CMDST_DONE;
xs->error = XS_SELTIMEOUT;
freetarget = 1;
goto end;
} else {
aprint_error_dev(sc->sc_c.sc_dev,
"selection timeout without "
"command\n");
need_reset = 1;
}
}
if (sist & SIST0_UDC) {
/*
* unexpected disconnect. Usually the target signals
* a fatal condition this way. Attempt to get sense.
*/
if (siop_cmd) {
siop_cmd->cmd_tables->status =
siop_htoc32(&sc->sc_c, SCSI_CHECK);
goto end;
}
aprint_error_dev(sc->sc_c.sc_dev,
"unexpected disconnect without "
"command\n");
goto reset;
}
if (sist & (SIST1_SBMC << 8)) {
/* SCSI bus mode change */
if (siop_modechange(&sc->sc_c) == 0 || need_reset == 1)
goto reset;
if ((istat & ISTAT_DIP) && (dstat & DSTAT_SIR)) {
/*
* we have a script interrupt, it will
* restart the script.
*/
goto scintr;
}
/*
* else we have to restart it ourselves, at the
* interrupted instruction.
*/
bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP,
bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP) - 8);
return 1;
}
/* Else it's an unhandled exception (for now). */
aprint_error_dev(sc->sc_c.sc_dev,
"unhandled scsi interrupt, sist=0x%x sstat1=0x%x "
"DSA=0x%x DSP=0x%x\n", sist,
bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SSTAT1),
bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA),
(int)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP) - sc->sc_c.sc_scriptaddr));
if (siop_cmd) {
siop_cmd->cmd_c.status = CMDST_DONE;
xs->error = XS_SELTIMEOUT;
goto end;
}
need_reset = 1;
}
if (need_reset) {
reset:
/* fatal error, reset the bus */
siop_resetbus(&sc->sc_c);
/* no table to flush here */
return 1;
}
scintr:
if ((istat & ISTAT_DIP) && (dstat & DSTAT_SIR)) { /* script interrupt */
irqcode = bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSPS);
#ifdef SIOP_DEBUG_INTR
printf("script interrupt 0x%x\n", irqcode);
#endif
/*
* no command, or an inactive command is only valid for a
* reselect interrupt
*/
if ((irqcode & 0x80) == 0) {
if (siop_cmd == NULL) {
aprint_error_dev(sc->sc_c.sc_dev,
"script interrupt (0x%x) with "
"invalid DSA !!!\n",
irqcode);
goto reset;
}
if (siop_cmd->cmd_c.status != CMDST_ACTIVE) {
aprint_error_dev(sc->sc_c.sc_dev,
"command with invalid status "
"(IRQ code 0x%x current status %d) !\n",
irqcode, siop_cmd->cmd_c.status);
xs = NULL;
}
}
switch(irqcode) {
case A_int_err:
printf("error, DSP=0x%x\n",
(int)(bus_space_read_4(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_DSP) -
sc->sc_c.sc_scriptaddr));
if (xs) {
xs->error = XS_SELTIMEOUT;
goto end;
} else {
goto reset;
}
case A_int_reseltarg:
aprint_error_dev(sc->sc_c.sc_dev,
"reselect with invalid target\n");
goto reset;
case A_int_resellun:
INCSTAT(siop_stat_intr_lunresel);
target = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA) & 0xf;
lun = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SCRATCHA + 1);
tag = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_SCRATCHA + 2);
siop_target =
(struct siop_target *)sc->sc_c.targets[target];
if (siop_target == NULL) {
printf("%s: reselect with invalid target %d\n",
device_xname(sc->sc_c.sc_dev), target);
goto reset;
}
siop_lun = siop_target->siop_lun[lun];
if (siop_lun == NULL) {
printf("%s: target %d reselect with invalid "
"lun %d\n", device_xname(sc->sc_c.sc_dev),
target, lun);
goto reset;
}
if (siop_lun->siop_tag[tag].active == NULL) {
printf("%s: target %d lun %d tag %d reselect "
"without command\n",
device_xname(sc->sc_c.sc_dev),
target, lun, tag);
goto reset;
}
siop_cmd = siop_lun->siop_tag[tag].active;
bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_DSP, siop_cmd->cmd_c.dsa +
sizeof(struct siop_common_xfer) +
Ent_ldsa_reload_dsa);
siop_table_sync(siop_cmd, BUS_DMASYNC_PREWRITE);
return 1;
case A_int_reseltag:
printf("%s: reselect with invalid tag\n",
device_xname(sc->sc_c.sc_dev));
goto reset;
case A_int_msgin:
{
int msgin = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SFBR);
if (msgin == MSG_MESSAGE_REJECT) {
int msg, extmsg;
if (siop_cmd->cmd_tables->msg_out[0] & 0x80) {
/*
* message was part of a identify +
* something else. Identify shouldn't
* have been rejected.
*/
msg =
siop_cmd->cmd_tables->msg_out[1];
extmsg =
siop_cmd->cmd_tables->msg_out[3];
} else {
msg = siop_cmd->cmd_tables->msg_out[0];
extmsg =
siop_cmd->cmd_tables->msg_out[2];
}
if (msg == MSG_MESSAGE_REJECT) {
/* MSG_REJECT for a MSG_REJECT !*/
if (xs)
scsipi_printaddr(xs->xs_periph);
else
printf("%s: ", device_xname(
sc->sc_c.sc_dev));
printf("our reject message was "
"rejected\n");
goto reset;
}
if (msg == MSG_EXTENDED &&
extmsg == MSG_EXT_WDTR) {
/* WDTR rejected, initiate sync */
if ((siop_target->target_c.flags &
TARF_SYNC) == 0) {
siop_target->target_c.status =
TARST_OK;
siop_update_xfer_mode(&sc->sc_c,
target);
/* no table to flush here */
CALL_SCRIPT(Ent_msgin_ack);
return 1;
}
siop_target->target_c.status =
TARST_SYNC_NEG;
siop_sdtr_msg(&siop_cmd->cmd_c, 0,
sc->sc_c.st_minsync,
sc->sc_c.maxoff);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD |
BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return 1;
} else if (msg == MSG_EXTENDED &&
extmsg == MSG_EXT_SDTR) {
/* sync rejected */
siop_target->target_c.offset = 0;
siop_target->target_c.period = 0;
siop_target->target_c.status = TARST_OK;
siop_update_xfer_mode(&sc->sc_c,
target);
/* no table to flush here */
CALL_SCRIPT(Ent_msgin_ack);
return 1;
} else if (msg == MSG_SIMPLE_Q_TAG ||
msg == MSG_HEAD_OF_Q_TAG ||
msg == MSG_ORDERED_Q_TAG) {
if (siop_handle_qtag_reject(
siop_cmd) == -1)
goto reset;
CALL_SCRIPT(Ent_msgin_ack);
return 1;
}
if (xs)
scsipi_printaddr(xs->xs_periph);
else
printf("%s: ",
device_xname(sc->sc_c.sc_dev));
if (msg == MSG_EXTENDED) {
printf("scsi message reject, extended "
"message sent was 0x%x\n", extmsg);
} else {
printf("scsi message reject, message "
"sent was 0x%x\n", msg);
}
/* no table to flush here */
CALL_SCRIPT(Ent_msgin_ack);
return 1;
}
if (msgin == MSG_IGN_WIDE_RESIDUE) {
/* use the extmsgdata table to get the second byte */
siop_cmd->cmd_tables->t_extmsgdata.count =
siop_htoc32(&sc->sc_c, 1);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_get_extmsgdata);
return 1;
}
if (xs)
scsipi_printaddr(xs->xs_periph);
else
printf("%s: ", device_xname(sc->sc_c.sc_dev));
printf("unhandled message 0x%x\n",
siop_cmd->cmd_tables->msg_in[0]);
siop_cmd->cmd_tables->msg_out[0] = MSG_MESSAGE_REJECT;
siop_cmd->cmd_tables->t_msgout.count =
siop_htoc32(&sc->sc_c, 1);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return 1;
}
case A_int_extmsgin:
#ifdef SIOP_DEBUG_INTR
printf("extended message: msg 0x%x len %d\n",
siop_cmd->cmd_tables->msg_in[2],
siop_cmd->cmd_tables->msg_in[1]);
#endif
if (siop_cmd->cmd_tables->msg_in[1] >
sizeof(siop_cmd->cmd_tables->msg_in) - 2)
aprint_error_dev(sc->sc_c.sc_dev,
"extended message too big (%d)\n",
siop_cmd->cmd_tables->msg_in[1]);
siop_cmd->cmd_tables->t_extmsgdata.count =
siop_htoc32(&sc->sc_c,
siop_cmd->cmd_tables->msg_in[1] - 1);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_get_extmsgdata);
return 1;
case A_int_extmsgdata:
#ifdef SIOP_DEBUG_INTR
{
int i;
printf("extended message: 0x%x, data:",
siop_cmd->cmd_tables->msg_in[2]);
for (i = 3; i < 2 + siop_cmd->cmd_tables->msg_in[1];
i++)
printf(" 0x%x",
siop_cmd->cmd_tables->msg_in[i]);
printf("\n");
}
#endif
if (siop_cmd->cmd_tables->msg_in[0] ==
MSG_IGN_WIDE_RESIDUE) {
/* we got the second byte of MSG_IGN_WIDE_RESIDUE */
if (siop_cmd->cmd_tables->msg_in[3] != 1)
printf("MSG_IGN_WIDE_RESIDUE: "
"bad len %d\n",
siop_cmd->cmd_tables->msg_in[3]);
switch (siop_iwr(&siop_cmd->cmd_c)) {
case SIOP_NEG_MSGOUT:
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD |
BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return(1);
case SIOP_NEG_ACK:
CALL_SCRIPT(Ent_msgin_ack);
return(1);
default:
panic("invalid retval from "
"siop_iwr()");
}
return(1);
}
if (siop_cmd->cmd_tables->msg_in[2] == MSG_EXT_WDTR) {
switch (siop_wdtr_neg(&siop_cmd->cmd_c)) {
case SIOP_NEG_MSGOUT:
siop_update_scntl3(sc,
siop_cmd->cmd_c.siop_target);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD |
BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return(1);
case SIOP_NEG_ACK:
siop_update_scntl3(sc,
siop_cmd->cmd_c.siop_target);
CALL_SCRIPT(Ent_msgin_ack);
return(1);
default:
panic("invalid retval from "
"siop_wdtr_neg()");
}
return(1);
}
if (siop_cmd->cmd_tables->msg_in[2] == MSG_EXT_SDTR) {
switch (siop_sdtr_neg(&siop_cmd->cmd_c)) {
case SIOP_NEG_MSGOUT:
siop_update_scntl3(sc,
siop_cmd->cmd_c.siop_target);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD |
BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return(1);
case SIOP_NEG_ACK:
siop_update_scntl3(sc,
siop_cmd->cmd_c.siop_target);
CALL_SCRIPT(Ent_msgin_ack);
return(1);
default:
panic("invalid retval from "
"siop_sdtr_neg()");
}
return(1);
}
/* send a message reject */
siop_cmd->cmd_tables->msg_out[0] = MSG_MESSAGE_REJECT;
siop_cmd->cmd_tables->t_msgout.count =
siop_htoc32(&sc->sc_c, 1);
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_send_msgout);
return 1;
case A_int_disc:
INCSTAT(siop_stat_intr_sdp);
offset = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA + 1);
#ifdef SIOP_DEBUG_DR
printf("disconnect offset %d\n", offset);
#endif
siop_sdp(&siop_cmd->cmd_c, offset);
/* we start again with no offset */
siop_cmd->saved_offset = SIOP_NOOFFSET;
siop_table_sync(siop_cmd,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
CALL_SCRIPT(Ent_script_sched);
return 1;
case A_int_saveoffset:
INCSTAT(siop_stat_intr_saveoffset);
offset = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA + 1);
#ifdef SIOP_DEBUG_DR
printf("saveoffset offset %d\n", offset);
#endif
siop_cmd->saved_offset = offset;
CALL_SCRIPT(Ent_script_sched);
return 1;
case A_int_resfail:
printf("reselect failed\n");
CALL_SCRIPT(Ent_script_sched);
return 1;
case A_int_done:
if (xs == NULL) {
printf("%s: done without command, DSA=0x%lx\n",
device_xname(sc->sc_c.sc_dev),
(u_long)siop_cmd->cmd_c.dsa);
siop_cmd->cmd_c.status = CMDST_FREE;
CALL_SCRIPT(Ent_script_sched);
return 1;
}
#ifdef SIOP_DEBUG_INTR
printf("done, DSA=0x%lx target id 0x%x last msg "
"in=0x%x status=0x%x\n",
(u_long)siop_cmd->cmd_c.dsa,
siop_ctoh32(&sc->sc_c, siop_cmd->cmd_tables->id),
siop_cmd->cmd_tables->msg_in[0],
siop_ctoh32(&sc->sc_c,
siop_cmd->cmd_tables->status));
#endif
INCSTAT(siop_stat_intr_done);
/* update resid. */
offset = bus_space_read_1(sc->sc_c.sc_rt,
sc->sc_c.sc_rh, SIOP_SCRATCHA + 1);
/*
* if we got a disconnect between the last data phase
* and the status phase, offset will be 0. In this
* case, siop_cmd->saved_offset will have the proper
* value if it got updated by the controller
*/
if (offset == 0 &&
siop_cmd->saved_offset != SIOP_NOOFFSET)
offset = siop_cmd->saved_offset;
siop_update_resid(&siop_cmd->cmd_c, offset);
siop_cmd->cmd_c.status = CMDST_DONE;
goto end;
default:
printf("unknown irqcode %x\n", irqcode);
if (xs) {
xs->error = XS_SELTIMEOUT;
goto end;
}
goto reset;
}
return 1;
}
/*
* We just shouldn't get there, but on some KVM virtual hosts,
* we do - see PR 48277.
*/
printf("siop_intr: I shouldn't be there !\n");
return 1;
end:
/*
* restart the script now if command completed properly
* Otherwise wait for siop_scsicmd_end(), we may need to cleanup the
* queue
*/
xs->status = siop_ctoh32(&sc->sc_c, siop_cmd->cmd_tables->status);
if (xs->status == SCSI_OK)
CALL_SCRIPT(Ent_script_sched);
else
restart = 1;
siop_lun->siop_tag[tag].active = NULL;
siop_scsicmd_end(siop_cmd);
if (freetarget && siop_target->target_c.status == TARST_PROBING)
siop_del_dev(sc, target, lun);
if (restart)
CALL_SCRIPT(Ent_script_sched);
if (sc->sc_flags & SCF_CHAN_NOSLOT) {
/* a command terminated, so we have free slots now */
sc->sc_flags &= ~SCF_CHAN_NOSLOT;
scsipi_channel_thaw(&sc->sc_c.sc_chan, 1);
}
switch(xs->status) {
case SCSI_OK:
xs->error = XS_NOERROR;
break;
case SCSI_BUSY:
xs->error = XS_BUSY;
break;
case SCSI_CHECK:
xs->error = XS_BUSY;
/* remove commands in the queue and scheduler */
siop_unqueue(sc, xs->xs_periph->periph_target,
xs->xs_periph->periph_lun);
break;
case SCSI_QUEUE_FULL:
INCSTAT(siop_stat_intr_qfull);
#ifdef SIOP_DEBUG
printf("%s:%d:%d: queue full (tag %d)\n",
device_xname(sc->sc_c.sc_dev),
xs->xs_periph->periph_target,
xs->xs_periph->periph_lun, siop_cmd->cmd_c.tag);
#endif
xs->error = XS_BUSY;
break;
case SCSI_SIOP_NOCHECK:
/*
* don't check status, xs->error is already valid
*/
break;
case SCSI_SIOP_NOSTATUS:
/*
* the status byte was not updated, cmd was
* aborted
*/
xs->error = XS_SELTIMEOUT;
break;
default:
scsipi_printaddr(xs->xs_periph);
printf("invalid status code %d\n", xs->status);
xs->error = XS_DRIVER_STUFFUP;
}
if (xs->xs_control & (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
bus_dmamap_sync(sc->sc_c.sc_dmat, siop_cmd->cmd_c.dmamap_data,
0, siop_cmd->cmd_c.dmamap_data->dm_mapsize,
(xs->xs_control & XS_CTL_DATA_IN) ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_c.sc_dmat,
siop_cmd->cmd_c.dmamap_data);
}
bus_dmamap_unload(sc->sc_c.sc_dmat, siop_cmd->cmd_c.dmamap_cmd);
if ((xs->xs_control & XS_CTL_POLL) == 0)
callout_stop(&xs->xs_callout);
siop_cmd->cmd_c.status = CMDST_FREE;
TAILQ_INSERT_TAIL(&sc->free_list, siop_cmd, next);
#if 0
if (xs->resid != 0)
printf("resid %d datalen %d\n", xs->resid, xs->datalen);
#endif
scsipi_done(xs);
}
void
siop_unqueue(struct siop_softc *sc, int target, int lun)
{
int slot, tag;
struct siop_cmd *siop_cmd;
struct siop_lun *siop_lun =
((struct siop_target *)sc->sc_c.targets[target])->siop_lun[lun];
/* first make sure to read valid data */
siop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
for (tag = 1; tag < SIOP_NTAG; tag++) {
/* look for commands in the scheduler, not yet started */
if (siop_lun->siop_tag[tag].active == NULL)
continue;
siop_cmd = siop_lun->siop_tag[tag].active;
for (slot = 0; slot <= sc->sc_currschedslot; slot++) {
if (siop_script_read(sc,
(Ent_script_sched_slot0 / 4) + slot * 2 + 1) ==
siop_cmd->cmd_c.dsa +
sizeof(struct siop_common_xfer) +
Ent_ldsa_select)
break;
}
if (slot > sc->sc_currschedslot)
continue; /* didn't find it */
if (siop_script_read(sc,
(Ent_script_sched_slot0 / 4) + slot * 2) == 0x80000000)
continue; /* already started */
/* clear the slot */
siop_script_write(sc, (Ent_script_sched_slot0 / 4) + slot * 2,
0x80000000);
/* ask to requeue */
siop_cmd->cmd_c.xs->error = XS_REQUEUE;
siop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
siop_lun->siop_tag[tag].active = NULL;
siop_scsicmd_end(siop_cmd);
}
/* update sc_currschedslot */
sc->sc_currschedslot = 0;
for (slot = SIOP_NSLOTS - 1; slot >= 0; slot--) {
if (siop_script_read(sc,
(Ent_script_sched_slot0 / 4) + slot * 2) != 0x80000000)
sc->sc_currschedslot = slot;
}
}
/*
* handle a rejected queue tag message: the command will run untagged,
* has to adjust the reselect script.
*/
int
siop_handle_qtag_reject(struct siop_cmd *siop_cmd)
{
struct siop_softc *sc = (struct siop_softc *)siop_cmd->cmd_c.siop_sc;
int target = siop_cmd->cmd_c.xs->xs_periph->periph_target;
int lun = siop_cmd->cmd_c.xs->xs_periph->periph_lun;
int tag = siop_cmd->cmd_tables->msg_out[2];
struct siop_lun *siop_lun =
((struct siop_target*)sc->sc_c.targets[target])->siop_lun[lun];
if (siop_lun->siop_tag[0].active != NULL) {
printf("%s: untagged command already running for target %d "
"lun %d (status %d)\n", device_xname(sc->sc_c.sc_dev),
target, lun, siop_lun->siop_tag[0].active->cmd_c.status);
return -1;
}
/* clear tag slot */
siop_lun->siop_tag[tag].active = NULL;
/* add command to non-tagged slot */
siop_lun->siop_tag[0].active = siop_cmd;
siop_cmd->cmd_c.tag = 0;
/* adjust reselect script if there is one */
if (siop_lun->siop_tag[0].reseloff > 0) {
siop_script_write(sc,
siop_lun->siop_tag[0].reseloff + 1,
siop_cmd->cmd_c.dsa + sizeof(struct siop_common_xfer) +
Ent_ldsa_reload_dsa);
siop_table_sync(siop_cmd, BUS_DMASYNC_PREWRITE);
}
return 0;
}
/*
* handle a bus reset: reset chip, unqueue all active commands, free all
* target struct and report lossage to upper layer.
* As the upper layer may requeue immediately we have to first store
* all active commands in a temporary queue.
*/
void
siop_handle_reset(struct siop_softc *sc)
{
struct siop_cmd *siop_cmd;
struct siop_lun *siop_lun;
int target, lun, tag;
/*
* scsi bus reset. reset the chip and restart
* the queue. Need to clean up all active commands
*/
printf("%s: scsi bus reset\n", device_xname(sc->sc_c.sc_dev));
/* stop, reset and restart the chip */
siop_reset(sc);
if (sc->sc_flags & SCF_CHAN_NOSLOT) {
/* chip has been reset, all slots are free now */
sc->sc_flags &= ~SCF_CHAN_NOSLOT;
scsipi_channel_thaw(&sc->sc_c.sc_chan, 1);
}
/*
* Process all commands: first commands being executed
*/
for (target = 0; target < sc->sc_c.sc_chan.chan_ntargets;
target++) {
if (sc->sc_c.targets[target] == NULL)
continue;
for (lun = 0; lun < 8; lun++) {
struct siop_target *siop_target =
(struct siop_target *)sc->sc_c.targets[target];
siop_lun = siop_target->siop_lun[lun];
if (siop_lun == NULL)
continue;
for (tag = 0; tag <
((sc->sc_c.targets[target]->flags & TARF_TAG) ?
SIOP_NTAG : 1);
tag++) {
siop_cmd = siop_lun->siop_tag[tag].active;
if (siop_cmd == NULL)
continue;
scsipi_printaddr(siop_cmd->cmd_c.xs->xs_periph);
printf("command with tag id %d reset\n", tag);
siop_cmd->cmd_c.xs->error =
(siop_cmd->cmd_c.flags & CMDFL_TIMEOUT) ?
XS_TIMEOUT : XS_RESET;
siop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
siop_lun->siop_tag[tag].active = NULL;
siop_cmd->cmd_c.status = CMDST_DONE;
siop_scsicmd_end(siop_cmd);
}
}
sc->sc_c.targets[target]->status = TARST_ASYNC;
sc->sc_c.targets[target]->flags &= ~TARF_ISWIDE;
sc->sc_c.targets[target]->period =
sc->sc_c.targets[target]->offset = 0;
siop_update_xfer_mode(&sc->sc_c, target);
}
/*
* first make sure to read valid data
*/
siop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
/*
* The queue management here is a bit tricky: the script always looks
* at the slot from first to last, so if we always use the first
* free slot commands can stay at the tail of the queue ~forever.
* The algorithm used here is to restart from the head when we know
* that the queue is empty, and only add commands after the last one.
* When we're at the end of the queue wait for the script to clear it.
* The best thing to do here would be to implement a circular queue,
* but using only 53c720 features this can be "interesting".
* A mid-way solution could be to implement 2 queues and swap orders.
*/
slot = sc->sc_currschedslot;
/*
* If the instruction is 0x80000000 (JUMP foo, IF FALSE) the slot is
* free. As this is the last used slot, all previous slots are free,
* we can restart from 0.
*/
if (siop_script_read(sc, (Ent_script_sched_slot0 / 4) + slot * 2) ==
0x80000000) {
slot = sc->sc_currschedslot = 0;
} else {
slot++;
}
target = siop_cmd->cmd_c.xs->xs_periph->periph_target;
lun = siop_cmd->cmd_c.xs->xs_periph->periph_lun;
siop_lun =
((struct siop_target*)sc->sc_c.targets[target])->siop_lun[lun];
/* if non-tagged command active, panic: this shouldn't happen */
if (siop_lun->siop_tag[0].active != NULL) {
panic("siop_start: tagged cmd while untagged running");
}
#ifdef DIAGNOSTIC
/* sanity check the tag if needed */
if (siop_cmd->cmd_c.flags & CMDFL_TAG) {
if (siop_lun->siop_tag[siop_cmd->cmd_c.tag].active != NULL)
panic("siop_start: tag not free");
if (siop_cmd->cmd_c.tag >= SIOP_NTAG) {
scsipi_printaddr(siop_cmd->cmd_c.xs->xs_periph);
printf(": tag id %d\n", siop_cmd->cmd_c.tag);
panic("siop_start: invalid tag id");
}
}
#endif
/*
* find a free scheduler slot and load it.
*/
for (; slot < SIOP_NSLOTS; slot++) {
/*
* If cmd if 0x80000000 the slot is free
*/
if (siop_script_read(sc,
(Ent_script_sched_slot0 / 4) + slot * 2) ==
0x80000000)
break;
}
if (slot == SIOP_NSLOTS) {
/*
* no more free slot, no need to continue. freeze the queue
* and requeue this command.
*/
scsipi_channel_freeze(&sc->sc_c.sc_chan, 1);
sc->sc_flags |= SCF_CHAN_NOSLOT;
siop_cmd->cmd_c.xs->error = XS_REQUEUE;
siop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
siop_scsicmd_end(siop_cmd);
return;
}
#ifdef SIOP_DEBUG_SCHED
printf("using slot %d for DSA 0x%lx\n", slot,
(u_long)siop_cmd->cmd_c.dsa);
#endif
/* mark command as active */
if (siop_cmd->cmd_c.status == CMDST_READY)
siop_cmd->cmd_c.status = CMDST_ACTIVE;
else
panic("siop_start: bad status");
siop_lun->siop_tag[siop_cmd->cmd_c.tag].active = siop_cmd;
/* patch scripts with DSA addr */
dsa = siop_cmd->cmd_c.dsa;
/* first reselect switch, if we have an entry */
if (siop_lun->siop_tag[siop_cmd->cmd_c.tag].reseloff > 0)
siop_script_write(sc,
siop_lun->siop_tag[siop_cmd->cmd_c.tag].reseloff + 1,
dsa + sizeof(struct siop_common_xfer) +
Ent_ldsa_reload_dsa);
/* CMD script: MOVE MEMORY addr */
siop_xfer = (struct siop_xfer*)siop_cmd->cmd_tables;
siop_xfer->resel[E_ldsa_abs_slot_Used[0]] =
siop_htoc32(&sc->sc_c, sc->sc_c.sc_scriptaddr +
Ent_script_sched_slot0 + slot * 8);
siop_table_sync(siop_cmd, BUS_DMASYNC_PREWRITE);
/* scheduler slot: JUMP ldsa_select */
siop_script_write(sc,
(Ent_script_sched_slot0 / 4) + slot * 2 + 1,
dsa + sizeof(struct siop_common_xfer) + Ent_ldsa_select);
/* handle timeout */
if ((siop_cmd->cmd_c.xs->xs_control & XS_CTL_POLL) == 0) {
/* start exire timer */
timeout = mstohz(siop_cmd->cmd_c.xs->timeout);
if (timeout == 0)
timeout = 1;
callout_reset( &siop_cmd->cmd_c.xs->xs_callout,
timeout, siop_timeout, siop_cmd);
}
/*
* Change JUMP cmd so that this slot will be handled
*/
siop_script_write(sc, (Ent_script_sched_slot0 / 4) + slot * 2,
0x80080000);
sc->sc_currschedslot = slot;
/* make sure SCRIPT processor will read valid data */
siop_script_sync(sc,BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/* Signal script it has some work to do */
bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
SIOP_ISTAT, ISTAT_SIGP);
/* and wait for IRQ */
}
s = splbio();
/* reset the scsi bus */
siop_resetbus(&sc->sc_c);
/* deactivate callout */
callout_stop(&siop_cmd->cmd_c.xs->xs_callout);
/* mark command as being timed out; siop_intr will handle it */
/*
* mark command has being timed out and just return;
* the bus reset will generate an interrupt,
* it will be handled in siop_intr()
*/
siop_cmd->cmd_c.flags |= CMDFL_TIMEOUT;
splx(s);
}
void
siop_dump_script(struct siop_softc *sc)
{
int i;
for (i = 0; i < PAGE_SIZE / 4; i += 2) {
printf("0x%04x: 0x%08x 0x%08x", i * 4,
siop_script_read(sc, i),
siop_script_read(sc, i + 1));
if ((siop_script_read(sc, i) & 0xe0000000) == 0xc0000000) {
i++;
printf(" 0x%08x", siop_script_read(sc, i + 1));
}
printf("\n");
}
}
void
siop_morecbd(struct siop_softc *sc)
{
int error, off, i, j, s;
bus_dma_segment_t seg;
int rseg;
struct siop_cbd *newcbd;
struct siop_xfer *xfer;
bus_addr_t dsa;
uint32_t *scr;
/* allocate a new list head */
newcbd = malloc(sizeof(struct siop_cbd), M_DEVBUF, M_NOWAIT|M_ZERO);
if (newcbd == NULL) {
aprint_error_dev(sc->sc_c.sc_dev,
"can't allocate memory for command descriptors head\n");
return;
}
void
siop_add_dev(struct siop_softc *sc, int target, int lun)
{
struct siop_lunsw *lunsw;
struct siop_target *siop_target =
(struct siop_target *)sc->sc_c.targets[target];
struct siop_lun *siop_lun = siop_target->siop_lun[lun];
int i, ntargets;
if (siop_lun->reseloff > 0)
return;
lunsw = siop_target->lunsw;
if ((lunsw->lunsw_off + lunsw->lunsw_size) < sc->script_free_lo) {
/*
* can't extend this slot. Probably not worth trying to deal
* with this case
*/
#ifdef SIOP_DEBUG
aprint_error_dev(sc->sc_c.sc_dev,
"%d:%d: can't allocate a lun sw slot\n", target, lun);
#endif
return;
}
/* count how many free targets we still have to probe */
ntargets = sc->sc_c.sc_chan.chan_ntargets - 1 - sc->sc_ntargets;
/*
* we need 8 bytes for the lun sw additional entry, and
* eventually sizeof(tag_switch) for the tag switch entry.
* Keep enough free space for the free targets that could be
* probed later.
*/
if (sc->script_free_lo + 2 +
(ntargets * __arraycount(lun_switch)) >=
((siop_target->target_c.flags & TARF_TAG) ?
sc->script_free_hi - __arraycount(tag_switch) :
sc->script_free_hi)) {
/*
* not enough space, probably not worth dealing with it.
* We can hold 13 tagged-queuing capable devices in the 4k RAM.
*/
#ifdef SIOP_DEBUG
aprint_error_dev(sc->sc_c.sc_dev,
"%d:%d: not enough memory for a lun sw slot\n",
target, lun);
#endif
return;
}
#ifdef SIOP_DEBUG
printf("%s:%d:%d: allocate lun sw entry\n",
device_xname(sc->sc_c.sc_dev), target, lun);
#endif
/* INT int_resellun */
siop_script_write(sc, sc->script_free_lo, 0x98080000);
siop_script_write(sc, sc->script_free_lo + 1, A_int_resellun);
/* Now the slot entry: JUMP abs_foo, IF lun */
siop_script_write(sc, sc->script_free_lo - 2,
0x800c0000 | lun);
siop_script_write(sc, sc->script_free_lo - 1, 0);
siop_lun->reseloff = sc->script_free_lo - 2;
lunsw->lunsw_size += 2;
sc->script_free_lo += 2;
if (siop_target->target_c.flags & TARF_TAG) {
/* we need a tag switch */
sc->script_free_hi -= __arraycount(tag_switch);
if (sc->sc_c.features & SF_CHIP_RAM) {
bus_space_write_region_4(sc->sc_c.sc_ramt,
sc->sc_c.sc_ramh,
sc->script_free_hi * 4, tag_switch,
__arraycount(tag_switch));
} else {
for(i = 0; i < __arraycount(tag_switch); i++) {
sc->sc_c.sc_script[sc->script_free_hi + i] =
siop_htoc32(&sc->sc_c, tag_switch[i]);
}
}
siop_script_write(sc,
siop_lun->reseloff + 1,
sc->sc_c.sc_scriptaddr + sc->script_free_hi * 4 +
Ent_tag_switch_entry);
for (i = 0; i < SIOP_NTAG; i++) {
siop_lun->siop_tag[i].reseloff =
sc->script_free_hi + (Ent_resel_tag0 / 4) + i * 2;
}
} else {
/* non-tag case; just work with the lun switch */
siop_lun->siop_tag[0].reseloff =
siop_target->siop_lun[lun]->reseloff;
}
siop_script_sync(sc, BUS_DMASYNC_PREWRITE);
}
void
siop_del_dev(struct siop_softc *sc, int target, int lun)
{
int i;
struct siop_target *siop_target;
#ifdef SIOP_DEBUG
printf("%s:%d:%d: free lun sw entry\n",
device_xname(sc->sc_c.sc_dev), target, lun);
#endif
if (sc->sc_c.targets[target] == NULL)
return;
siop_target = (struct siop_target *)sc->sc_c.targets[target];
free(siop_target->siop_lun[lun], M_DEVBUF);
siop_target->siop_lun[lun] = NULL;
/* XXX compact sw entry too ? */
/* check if we can free the whole target */
for (i = 0; i < 8; i++) {
if (siop_target->siop_lun[i] != NULL)
return;
}
#ifdef SIOP_DEBUG
printf("%s: free siop_target for target %d lun %d lunsw offset %d\n",
device_xname(sc->sc_c.sc_dev), target, lun,
siop_target->lunsw->lunsw_off);
#endif
/*
* nothing here, free the target struct and resel
* switch entry
*/
siop_script_write(sc, siop_target->reseloff, 0x800c00ff);
siop_script_sync(sc, BUS_DMASYNC_PREWRITE);
TAILQ_INSERT_TAIL(&sc->lunsw_list, siop_target->lunsw, next);
free(sc->sc_c.targets[target], M_DEVBUF);
sc->sc_c.targets[target] = NULL;
sc->sc_ntargets--;
}
