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- /*
- * 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
- */
-
- /*
- * HP9000/3xx 98658 SCSI host adaptor driver.
- */
- #include "scsi.h"
- #if NSCSI > 0
-
- #ifndef lint
- static char rcsid[] = "$Header: scsi.c,v 1.4 91/01/17 12:50:18 mike Exp $";
- #endif
-
- #include "sys/param.h"
- #include "sys/systm.h"
- #include "sys/buf.h"
- #include "device.h"
-
- #include "scsivar.h"
- #include "scsireg.h"
- #include "dmavar.h"
-
- #include "../include/cpu.h"
- #include "../hp300/isr.h"
-
- /*
- * SCSI delays
- * In u-seconds, primarily for state changes on the SPC.
- */
- #define SCSI_CMD_WAIT 1000 /* wait per step of 'immediate' cmds */
- #define SCSI_DATA_WAIT 1000 /* wait per data in/out step */
- #define SCSI_INIT_WAIT 50000 /* wait per step (both) during init */
-
- extern void isrlink();
- extern void _insque();
- extern void _remque();
-
- int scsiinit(), scsigo(), scsiintr(), scsixfer();
- void scsistart(), scsidone(), scsifree(), scsireset();
- struct driver scsidriver = {
- scsiinit, "scsi", (int (*)())scsistart, scsigo, scsiintr,
- (int (*)())scsidone,
- };
-
- struct scsi_softc scsi_softc[NSCSI];
- struct isr scsi_isr[NSCSI];
-
- int scsi_cmd_wait = SCSI_CMD_WAIT;
- int scsi_data_wait = SCSI_DATA_WAIT;
- int scsi_init_wait = SCSI_INIT_WAIT;
-
- int scsi_nosync = 1; /* inhibit sync xfers if 1 */
- int scsi_pridma = 0; /* use "priority" dma */
-
- #ifdef DEBUG
- int scsi_debug = 0;
- #define WAITHIST
- #endif
-
- #ifdef WAITHIST
- #define MAXWAIT 1022
- u_int ixstart_wait[MAXWAIT+2];
- u_int ixin_wait[MAXWAIT+2];
- u_int ixout_wait[MAXWAIT+2];
- u_int mxin_wait[MAXWAIT+2];
- u_int mxin2_wait[MAXWAIT+2];
- u_int cxin_wait[MAXWAIT+2];
- u_int fxfr_wait[MAXWAIT+2];
- u_int sgo_wait[MAXWAIT+2];
- #define HIST(h,w) (++h[((w)>MAXWAIT? MAXWAIT : ((w) < 0 ? -1 : (w))) + 1]);
- #else
- #define HIST(h,w)
- #endif
-
- #define b_cylin b_resid
-
- static void
- scsiabort(hs, hd, where)
- register struct scsi_softc *hs;
- volatile register struct scsidevice *hd;
- char *where;
- {
- int len;
- u_char junk;
-
- printf("scsi%d: abort from %s: phase=0x%x, ssts=0x%x, ints=0x%x\n",
- hs->sc_hc->hp_unit, where, hd->scsi_psns, hd->scsi_ssts,
- hd->scsi_ints);
-
- hd->scsi_ints = hd->scsi_ints;
- hd->scsi_csr = 0;
- if (hd->scsi_psns == 0 || (hd->scsi_ssts & SSTS_INITIATOR) == 0)
- /* no longer connected to scsi target */
- return;
-
- /* get the number of bytes remaining in current xfer + fudge */
- len = (hd->scsi_tch << 16) | (hd->scsi_tcm << 8) | hd->scsi_tcl;
-
- /* for that many bus cycles, try to send an abort msg */
- for (len += 1024; (hd->scsi_ssts & SSTS_INITIATOR) && --len >= 0; ) {
- hd->scsi_scmd = SCMD_SET_ATN;
- while ((hd->scsi_psns & PSNS_REQ) == 0) {
- if (! (hd->scsi_ssts & SSTS_INITIATOR))
- goto out;
- DELAY(1);
- }
- if ((hd->scsi_psns & PHASE) == MESG_OUT_PHASE)
- hd->scsi_scmd = SCMD_RST_ATN;
- hd->scsi_pctl = hd->scsi_psns & PHASE;
- if (hd->scsi_psns & PHASE_IO) {
- /* one of the input phases - read & discard a byte */
- hd->scsi_scmd = SCMD_SET_ACK;
- if (hd->scsi_tmod == 0)
- while (hd->scsi_psns & PSNS_REQ)
- DELAY(1);
- junk = hd->scsi_temp;
- } else {
- /* one of the output phases - send an abort msg */
- hd->scsi_temp = MSG_ABORT;
- hd->scsi_scmd = SCMD_SET_ACK;
- if (hd->scsi_tmod == 0)
- while (hd->scsi_psns & PSNS_REQ)
- DELAY(1);
- }
- hd->scsi_scmd = SCMD_RST_ACK;
- }
- out:
- /*
- * Either the abort was successful & the bus is disconnected or
- * the device didn't listen. If the latter, announce the problem.
- * Either way, reset the card & the SPC.
- */
- if (len < 0 && hs)
- printf("scsi%d: abort failed. phase=0x%x, ssts=0x%x\n",
- hs->sc_hc->hp_unit, hd->scsi_psns, hd->scsi_ssts);
-
- if (! ((junk = hd->scsi_ints) & INTS_RESEL)) {
- hd->scsi_sctl |= SCTL_CTRLRST;
- DELAY(1);
- hd->scsi_sctl &=~ SCTL_CTRLRST;
- hd->scsi_hconf = 0;
- hd->scsi_ints = hd->scsi_ints;
- }
- }
-
- /*
- * XXX Set/reset long delays.
- *
- * if delay == 0, reset default delays
- * if delay < 0, set both delays to default long initialization values
- * if delay > 0, set both delays to this value
- *
- * Used when a devices is expected to respond slowly (e.g. during
- * initialization).
- */
- void
- scsi_delay(delay)
- int delay;
- {
- static int saved_cmd_wait, saved_data_wait;
-
- if (delay) {
- saved_cmd_wait = scsi_cmd_wait;
- saved_data_wait = scsi_data_wait;
- if (delay > 0)
- scsi_cmd_wait = scsi_data_wait = delay;
- else
- scsi_cmd_wait = scsi_data_wait = scsi_init_wait;
- } else {
- scsi_cmd_wait = saved_cmd_wait;
- scsi_data_wait = saved_data_wait;
- }
- }
-
- int
- scsiinit(hc)
- register struct hp_ctlr *hc;
- {
- register struct scsi_softc *hs = &scsi_softc[hc->hp_unit];
- register struct scsidevice *hd = (struct scsidevice *)hc->hp_addr;
-
- if ((hd->scsi_id & ID_MASK) != SCSI_ID)
- return(0);
- hc->hp_ipl = SCSI_IPL(hd->scsi_csr);
- hs->sc_hc = hc;
- hs->sc_dq.dq_unit = hc->hp_unit;
- hs->sc_dq.dq_driver = &scsidriver;
- hs->sc_sq.dq_forw = hs->sc_sq.dq_back = &hs->sc_sq;
- scsi_isr[hc->hp_unit].isr_intr = scsiintr;
- scsi_isr[hc->hp_unit].isr_ipl = hc->hp_ipl;
- scsi_isr[hc->hp_unit].isr_arg = hc->hp_unit;
- isrlink(&scsi_isr[hc->hp_unit]);
- scsireset(hc->hp_unit);
- return(1);
- }
-
- void
- scsireset(unit)
- register int unit;
- {
- register struct scsi_softc *hs = &scsi_softc[unit];
- volatile register struct scsidevice *hd =
- (struct scsidevice *)hs->sc_hc->hp_addr;
- u_int i;
-
- if (hs->sc_flags & SCSI_ALIVE)
- scsiabort(hs, hd, "reset");
-
- printf("scsi%d: ", unit);
-
- hd->scsi_id = 0xFF;
- DELAY(100);
- /*
- * Disable interrupts then reset the FUJI chip.
- */
- hd->scsi_csr = 0;
- hd->scsi_sctl = SCTL_DISABLE | SCTL_CTRLRST;
- hd->scsi_scmd = 0;
- hd->scsi_tmod = 0;
- hd->scsi_pctl = 0;
- hd->scsi_temp = 0;
- hd->scsi_tch = 0;
- hd->scsi_tcm = 0;
- hd->scsi_tcl = 0;
- hd->scsi_ints = 0;
-
- if ((hd->scsi_id & ID_WORD_DMA) == 0) {
- hs->sc_flags |= SCSI_DMA32;
- printf("32 bit dma, ");
- }
-
- /* Determine Max Synchronous Transfer Rate */
- if (scsi_nosync)
- i = 3;
- else
- i = SCSI_SYNC_XFER(hd->scsi_hconf);
- switch (i) {
- case 0:
- hs->sc_sync = TMOD_SYNC | 0x3e; /* 250 nsecs */
- printf("250ns sync");
- break;
- case 1:
- hs->sc_sync = TMOD_SYNC | 0x5e; /* 375 nsecs */
- printf("375ns sync");
- break;
- case 2:
- hs->sc_sync = TMOD_SYNC | 0x7d; /* 500 nsecs */
- printf("500ns sync");
- break;
- case 3:
- hs->sc_sync = 0;
- printf("async");
- break;
- }
-
- /*
- * Configure the FUJI chip with its SCSI address, all
- * interrupts enabled & appropriate parity.
- */
- i = (~hd->scsi_hconf) & 0x7;
- hs->sc_scsi_addr = 1 << i;
- hd->scsi_bdid = i;
- if (hd->scsi_hconf & HCONF_PARITY)
- hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
- SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
- SCTL_INTR_ENAB | SCTL_PARITY_ENAB;
- else {
- hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
- SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
- SCTL_INTR_ENAB;
- printf(", no parity");
- }
- hd->scsi_sctl &=~ SCTL_DISABLE;
-
- printf(", scsi id %d\n", i);
- hs->sc_flags |= SCSI_ALIVE;
- }
-
- static void
- scsierror(hs, hd, ints)
- register struct scsi_softc *hs;
- volatile register struct scsidevice *hd;
- u_char ints;
- {
- int unit = hs->sc_hc->hp_unit;
- char *sep = "";
-
- printf("scsi%d: ", unit);
- if (ints & INTS_RST) {
- DELAY(100);
- if (hd->scsi_hconf & HCONF_SD)
- printf("spurious RST interrupt");
- else
- printf("hardware error - check fuse");
- sep = ", ";
- }
- if ((ints & INTS_HARD_ERR) || hd->scsi_serr) {
- if (hd->scsi_serr & SERR_SCSI_PAR) {
- printf("%sparity err", sep);
- sep = ", ";
- }
- if (hd->scsi_serr & SERR_SPC_PAR) {
- printf("%sSPC parity err", sep);
- sep = ", ";
- }
- if (hd->scsi_serr & SERR_TC_PAR) {
- printf("%sTC parity err", sep);
- sep = ", ";
- }
- if (hd->scsi_serr & SERR_PHASE_ERR) {
- printf("%sphase err", sep);
- sep = ", ";
- }
- if (hd->scsi_serr & SERR_SHORT_XFR) {
- printf("%ssync short transfer err", sep);
- sep = ", ";
- }
- if (hd->scsi_serr & SERR_OFFSET) {
- printf("%ssync offset error", sep);
- sep = ", ";
- }
- }
- if (ints & INTS_TIMEOUT)
- printf("%sSPC select timeout error", sep);
- if (ints & INTS_SRV_REQ)
- printf("%sspurious SRV_REQ interrupt", sep);
- if (ints & INTS_CMD_DONE)
- printf("%sspurious CMD_DONE interrupt", sep);
- if (ints & INTS_DISCON)
- printf("%sspurious disconnect interrupt", sep);
- if (ints & INTS_RESEL)
- printf("%sspurious reselect interrupt", sep);
- if (ints & INTS_SEL)
- printf("%sspurious select interrupt", sep);
- printf("\n");
- }
-
- static int
- issue_select(hd, target, our_addr)
- volatile register struct scsidevice *hd;
- u_char target, our_addr;
- {
- if (hd->scsi_ssts & (SSTS_INITIATOR|SSTS_TARGET|SSTS_BUSY))
- return (1);
-
- if (hd->scsi_ints & INTS_DISCON)
- hd->scsi_ints = INTS_DISCON;
-
- hd->scsi_pctl = 0;
- hd->scsi_temp = (1 << target) | our_addr;
- /* select timeout is hardcoded to 2ms */
- hd->scsi_tch = 0;
- hd->scsi_tcm = 32;
- hd->scsi_tcl = 4;
-
- hd->scsi_scmd = SCMD_SELECT;
- return (0);
- }
-
- static int
- wait_for_select(hd)
- volatile register struct scsidevice *hd;
- {
- u_char ints;
-
- while ((ints = hd->scsi_ints) == 0)
- DELAY(1);
- hd->scsi_ints = ints;
- return (!(hd->scsi_ssts & SSTS_INITIATOR));
- }
-
- static int
- ixfer_start(hd, len, phase, wait)
- volatile register struct scsidevice *hd;
- int len;
- u_char phase;
- register int wait;
- {
-
- hd->scsi_tch = len >> 16;
- hd->scsi_tcm = len >> 8;
- hd->scsi_tcl = len;
- hd->scsi_pctl = phase;
- hd->scsi_tmod = 0; /*XXX*/
- hd->scsi_scmd = SCMD_XFR | SCMD_PROG_XFR;
-
- /* wait for xfer to start or svc_req interrupt */
- while ((hd->scsi_ssts & SSTS_BUSY) == 0) {
- if (hd->scsi_ints || --wait < 0) {
- #ifdef DEBUG
- if (scsi_debug)
- printf("ixfer_start fail: i%x, w%d\n",
- hd->scsi_ints, wait);
- #endif
- HIST(ixstart_wait, wait)
- return (0);
- }
- DELAY(1);
- }
- HIST(ixstart_wait, wait)
- return (1);
- }
-
- static int
- ixfer_out(hd, len, buf)
- volatile register struct scsidevice *hd;
- int len;
- register u_char *buf;
- {
- register int wait = scsi_data_wait;
-
- for (; len > 0; --len) {
- while (hd->scsi_ssts & SSTS_DREG_FULL) {
- if (hd->scsi_ints || --wait < 0) {
- #ifdef DEBUG
- if (scsi_debug)
- printf("ixfer_out fail: l%d i%x w%d\n",
- len, hd->scsi_ints, wait);
- #endif
- HIST(ixout_wait, wait)
- return (len);
- }
- DELAY(1);
- }
- hd->scsi_dreg = *buf++;
- }
- HIST(ixout_wait, wait)
- return (0);
- }
-
- static void
- ixfer_in(hd, len, buf)
- volatile register struct scsidevice *hd;
- int len;
- register u_char *buf;
- {
- register int wait = scsi_data_wait;
-
- for (; len > 0; --len) {
- while (hd->scsi_ssts & SSTS_DREG_EMPTY) {
- if (hd->scsi_ints || --wait < 0) {
- while (! (hd->scsi_ssts & SSTS_DREG_EMPTY)) {
- *buf++ = hd->scsi_dreg;
- --len;
- }
- #ifdef DEBUG
- if (scsi_debug)
- printf("ixfer_in fail: l%d i%x w%d\n",
- len, hd->scsi_ints, wait);
- #endif
- HIST(ixin_wait, wait)
- return;
- }
- DELAY(1);
- }
- *buf++ = hd->scsi_dreg;
- }
- HIST(ixin_wait, wait)
- }
-
- static int
- mxfer_in(hd, len, buf, phase)
- volatile register struct scsidevice *hd;
- register int len;
- register u_char *buf;
- register u_char phase;
- {
- register int wait = scsi_cmd_wait;
- register int i;
-
- hd->scsi_tmod = 0;
- for (i = 0; i < len; ++i) {
- /*
- * manual sez: reset ATN before ACK is sent.
- */
- if (hd->scsi_psns & PSNS_ATN)
- hd->scsi_scmd = SCMD_RST_ATN;
- /*
- * wait for the request line (which says the target
- * wants to give us data). If the phase changes while
- * we're waiting, we're done.
- */
- while ((hd->scsi_psns & PSNS_REQ) == 0) {
- if (--wait < 0) {
- HIST(mxin_wait, wait)
- return (-1);
- }
- if ((hd->scsi_psns & PHASE) != phase ||
- (hd->scsi_ssts & SSTS_INITIATOR) == 0)
- goto out;
-
- DELAY(1);
- }
- /*
- * set ack (which says we're ready for the data, wait for
- * req to go away (target says data is available), grab the
- * data, then reset ack (say we've got the data).
- */
- hd->scsi_pctl = phase;
- hd->scsi_scmd = SCMD_SET_ACK;
- while (hd->scsi_psns & PSNS_REQ) {
- if (--wait < 0) {
- HIST(mxin_wait, wait)
- return (-2);
- }
- DELAY(1);
- }
- *buf++ = hd->scsi_temp;
- hd->scsi_scmd = SCMD_RST_ACK;
- }
- out:
- HIST(mxin_wait, wait)
- /*
- * Wait for manual transfer to finish.
- * Avoids occasional "unexpected phase" errors in finishxfer
- * formerly addressed by per-slave delays.
- */
- wait = scsi_cmd_wait;
- while ((hd->scsi_ssts & SSTS_ACTIVE) == SSTS_INITIATOR) {
- if (--wait < 0)
- break;
- DELAY(1);
- }
- HIST(mxin2_wait, wait)
- return (i);
- }
-
- /*
- * SCSI 'immediate' command: issue a command to some SCSI device
- * and get back an 'immediate' response (i.e., do programmed xfer
- * to get the response data). 'cbuf' is a buffer containing a scsi
- * command of length clen bytes. 'buf' is a buffer of length 'len'
- * bytes for data. The transfer direction is determined by the device
- * (i.e., by the scsi bus data xfer phase). If 'len' is zero, the
- * command must supply no data. 'xferphase' is the bus phase the
- * caller expects to happen after the command is issued. It should
- * be one of DATA_IN_PHASE, DATA_OUT_PHASE or STATUS_PHASE.
- */
- static int
- scsiicmd(hs, target, cbuf, clen, buf, len, xferphase)
- struct scsi_softc *hs;
- int target;
- u_char *cbuf;
- int clen;
- u_char *buf;
- int len;
- u_char xferphase;
- {
- volatile register struct scsidevice *hd =
- (struct scsidevice *)hs->sc_hc->hp_addr;
- u_char phase, ints;
- register int wait;
-
- /* select the SCSI bus (it's an error if bus isn't free) */
- if (issue_select(hd, target, hs->sc_scsi_addr))
- return (-1);
- if (wait_for_select(hd))
- return (-1);
- /*
- * Wait for a phase change (or error) then let the device
- * sequence us through the various SCSI phases.
- */
- hs->sc_stat[0] = 0xff;
- hs->sc_msg[0] = 0xff;
- phase = CMD_PHASE;
- while (1) {
- wait = scsi_cmd_wait;
- switch (phase) {
-
- case CMD_PHASE:
- if (ixfer_start(hd, clen, phase, wait))
- if (ixfer_out(hd, clen, cbuf))
- goto abort;
- phase = xferphase;
- break;
-
- case DATA_IN_PHASE:
- if (len <= 0)
- goto abort;
- wait = scsi_data_wait;
- if (ixfer_start(hd, len, phase, wait) ||
- !(hd->scsi_ssts & SSTS_DREG_EMPTY))
- ixfer_in(hd, len, buf);
- phase = STATUS_PHASE;
- break;
-
- case DATA_OUT_PHASE:
- if (len <= 0)
- goto abort;
- wait = scsi_data_wait;
- if (ixfer_start(hd, len, phase, wait)) {
- if (ixfer_out(hd, len, buf))
- goto abort;
- }
- phase = STATUS_PHASE;
- break;
-
- case STATUS_PHASE:
- wait = scsi_data_wait;
- if (ixfer_start(hd, sizeof(hs->sc_stat), phase, wait) ||
- !(hd->scsi_ssts & SSTS_DREG_EMPTY))
- ixfer_in(hd, sizeof(hs->sc_stat), hs->sc_stat);
- phase = MESG_IN_PHASE;
- break;
-
- case MESG_IN_PHASE:
- if (ixfer_start(hd, sizeof(hs->sc_msg), phase, wait) ||
- !(hd->scsi_ssts & SSTS_DREG_EMPTY)) {
- ixfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg);
- hd->scsi_scmd = SCMD_RST_ACK;
- }
- phase = BUS_FREE_PHASE;
- break;
-
- case BUS_FREE_PHASE:
- goto out;
-
- default:
- printf("scsi%d: unexpected phase %d in icmd from %d\n",
- hs->sc_hc->hp_unit, phase, target);
- goto abort;
- }
- /* wait for last command to complete */
- while ((ints = hd->scsi_ints) == 0) {
- if (--wait < 0) {
- HIST(cxin_wait, wait)
- goto abort;
- }
- DELAY(1);
- }
- HIST(cxin_wait, wait)
- hd->scsi_ints = ints;
- if (ints & INTS_SRV_REQ)
- phase = hd->scsi_psns & PHASE;
- else if (ints & INTS_DISCON)
- goto out;
- else if ((ints & INTS_CMD_DONE) == 0) {
- scsierror(hs, hd, ints);
- goto abort;
- }
- }
- abort:
- scsiabort(hs, hd, "icmd");
- out:
- return (hs->sc_stat[0]);
- }
-
- /*
- * Finish SCSI xfer command: After the completion interrupt from
- * a read/write operation, sequence through the final phases in
- * programmed i/o. This routine is a lot like scsiicmd except we
- * skip (and don't allow) the select, cmd out and data in/out phases.
- */
- static void
- finishxfer(hs, hd, target)
- struct scsi_softc *hs;
- volatile register struct scsidevice *hd;
- int target;
- {
- u_char phase, ints;
-
- /*
- * We specified padding xfer so we ended with either a phase
- * change interrupt (normal case) or an error interrupt (handled
- * elsewhere). Reset the board dma logic then try to get the
- * completion status & command done msg. The reset confuses
- * the SPC REQ/ACK logic so we have to do any status/msg input
- * operations via 'manual xfer'.
- */
- if (hd->scsi_ssts & SSTS_BUSY) {
- int wait = scsi_cmd_wait;
-
- /* wait for dma operation to finish */
- while (hd->scsi_ssts & SSTS_BUSY) {
- if (--wait < 0) {
- #ifdef DEBUG
- if (scsi_debug)
- printf("finishxfer fail: ssts %x\n",
- hd->scsi_ssts);
- #endif
- HIST(fxfr_wait, wait)
- goto abort;
- }
- }
- HIST(fxfr_wait, wait)
- }
- hd->scsi_scmd |= SCMD_PROG_XFR;
- hd->scsi_sctl |= SCTL_CTRLRST;
- DELAY(1);
- hd->scsi_sctl &=~ SCTL_CTRLRST;
- hd->scsi_hconf = 0;
- hs->sc_stat[0] = 0xff;
- hs->sc_msg[0] = 0xff;
- hd->scsi_csr = 0;
- hd->scsi_ints = ints = hd->scsi_ints;
- while (1) {
- phase = hd->scsi_psns & PHASE;
- switch (phase) {
-
- case STATUS_PHASE:
- if (mxfer_in(hd, sizeof(hs->sc_stat), hs->sc_stat,
- phase) <= 0)
- goto abort;
- break;
-
- case MESG_IN_PHASE:
- if (mxfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg,
- phase) < 0)
- goto abort;
- break;
-
- case BUS_FREE_PHASE:
- return;
-
- default:
- printf("scsi%d: unexpected phase %d in finishxfer from %d\n",
- hs->sc_hc->hp_unit, phase, target);
- goto abort;
- }
- if (ints = hd->scsi_ints) {
- hd->scsi_ints = ints;
- if (ints & INTS_DISCON)
- return;
- else if (ints & ~(INTS_SRV_REQ|INTS_CMD_DONE)) {
- scsierror(hs, hd, ints);
- break;
- }
- }
- if ((hd->scsi_ssts & SSTS_INITIATOR) == 0)
- return;
- }
- abort:
- scsiabort(hs, hd, "finishxfer");
- hs->sc_stat[0] = 0xfe;
- }
-
- int
- scsi_test_unit_rdy(ctlr, slave, unit)
- int ctlr, slave, unit;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- static struct scsi_cdb6 cdb = { CMD_TEST_UNIT_READY };
-
- cdb.lun = unit;
- return (scsiicmd(hs, slave, &cdb, sizeof(cdb), (u_char *)0, 0,
- STATUS_PHASE));
- }
-
- int
- scsi_request_sense(ctlr, slave, unit, buf, len)
- int ctlr, slave, unit;
- u_char *buf;
- unsigned len;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- static struct scsi_cdb6 cdb = { CMD_REQUEST_SENSE };
-
- cdb.lun = unit;
- cdb.len = len;
- return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_IN_PHASE));
- }
-
- int
- scsi_immed_command(ctlr, slave, unit, cdb, buf, len, rd)
- int ctlr, slave, unit;
- struct scsi_fmt_cdb *cdb;
- u_char *buf;
- unsigned len;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
-
- cdb->cdb[1] |= unit << 5;
- return (scsiicmd(hs, slave, cdb->cdb, cdb->len, buf, len,
- rd != 0? DATA_IN_PHASE : DATA_OUT_PHASE));
- }
-
- /*
- * The following routines are test-and-transfer i/o versions of read/write
- * for things like reading disk labels and writing core dumps. The
- * routine scsigo should be used for normal data transfers, NOT these
- * routines.
- */
- int
- scsi_tt_read(ctlr, slave, unit, buf, len, blk, bshift)
- int ctlr, slave, unit;
- u_char *buf;
- u_int len;
- daddr_t blk;
- int bshift;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- struct scsi_cdb10 cdb;
- int stat;
- int old_wait = scsi_data_wait;
-
- scsi_data_wait = 300000;
- bzero(&cdb, sizeof(cdb));
- cdb.cmd = CMD_READ_EXT;
- cdb.lun = unit;
- blk >>= bshift;
- cdb.lbah = blk >> 24;
- cdb.lbahm = blk >> 16;
- cdb.lbalm = blk >> 8;
- cdb.lbal = blk;
- cdb.lenh = len >> (8 + DEV_BSHIFT + bshift);
- cdb.lenl = len >> (DEV_BSHIFT + bshift);
- stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_IN_PHASE);
- scsi_data_wait = old_wait;
- return (stat);
- }
-
- int
- scsi_tt_write(ctlr, slave, unit, buf, len, blk, bshift)
- int ctlr, slave, unit;
- u_char *buf;
- u_int len;
- daddr_t blk;
- int bshift;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- struct scsi_cdb10 cdb;
- int stat;
- int old_wait = scsi_data_wait;
-
- scsi_data_wait = 300000;
-
- bzero(&cdb, sizeof(cdb));
- cdb.cmd = CMD_WRITE_EXT;
- cdb.lun = unit;
- blk >>= bshift;
- cdb.lbah = blk >> 24;
- cdb.lbahm = blk >> 16;
- cdb.lbalm = blk >> 8;
- cdb.lbal = blk;
- cdb.lenh = len >> (8 + DEV_BSHIFT + bshift);
- cdb.lenl = len >> (DEV_BSHIFT + bshift);
- stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, DATA_OUT_PHASE);
- scsi_data_wait = old_wait;
- return (stat);
- }
-
- int
- scsireq(dq)
- register struct devqueue *dq;
- {
- register struct devqueue *hq;
-
- hq = &scsi_softc[dq->dq_ctlr].sc_sq;
- insque(dq, hq->dq_back);
- if (dq->dq_back == hq)
- return(1);
- return(0);
- }
-
- int
- scsiustart(unit)
- int unit;
- {
- register struct scsi_softc *hs = &scsi_softc[unit];
-
- hs->sc_dq.dq_ctlr = DMA0 | DMA1;
- if (dmareq(&hs->sc_dq))
- return(1);
- return(0);
- }
-
- void
- scsistart(unit)
- int unit;
- {
- register struct devqueue *dq;
-
- dq = scsi_softc[unit].sc_sq.dq_forw;
- (dq->dq_driver->d_go)(dq->dq_unit);
- }
-
- int
- scsigo(ctlr, slave, unit, bp, cdb, pad)
- int ctlr, slave, unit;
- struct buf *bp;
- struct scsi_fmt_cdb *cdb;
- int pad;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- volatile register struct scsidevice *hd =
- (struct scsidevice *)hs->sc_hc->hp_addr;
- int i, dmaflags;
- u_char phase, ints, cmd;
-
- cdb->cdb[1] |= unit << 5;
-
- /* select the SCSI bus (it's an error if bus isn't free) */
- if (issue_select(hd, slave, hs->sc_scsi_addr) || wait_for_select(hd)) {
- dmafree(&hs->sc_dq);
- return (1);
- }
- /*
- * Wait for a phase change (or error) then let the device
- * sequence us through command phase (we may have to take
- * a msg in/out before doing the command). If the disk has
- * to do a seek, it may be a long time until we get a change
- * to data phase so, in the absense of an explicit phase
- * change, we assume data phase will be coming up and tell
- * the SPC to start a transfer whenever it does. We'll get
- * a service required interrupt later if this assumption is
- * wrong. Otherwise we'll get a service required int when
- * the transfer changes to status phase.
- */
- phase = CMD_PHASE;
- while (1) {
- register int wait = scsi_cmd_wait;
-
- switch (phase) {
-
- case CMD_PHASE:
- if (ixfer_start(hd, cdb->len, phase, wait))
- if (ixfer_out(hd, cdb->len, cdb->cdb))
- goto abort;
- break;
-
- case MESG_IN_PHASE:
- if (ixfer_start(hd, sizeof(hs->sc_msg), phase, wait)||
- !(hd->scsi_ssts & SSTS_DREG_EMPTY)) {
- ixfer_in(hd, sizeof(hs->sc_msg), hs->sc_msg);
- hd->scsi_scmd = SCMD_RST_ACK;
- }
- phase = BUS_FREE_PHASE;
- break;
-
- case DATA_IN_PHASE:
- case DATA_OUT_PHASE:
- goto out;
-
- default:
- printf("scsi%d: unexpected phase %d in go from %d\n",
- hs->sc_hc->hp_unit, phase, slave);
- goto abort;
- }
- while ((ints = hd->scsi_ints) == 0) {
- if (--wait < 0) {
- HIST(sgo_wait, wait)
- goto abort;
- }
- DELAY(1);
- }
- HIST(sgo_wait, wait)
- hd->scsi_ints = ints;
- if (ints & INTS_SRV_REQ)
- phase = hd->scsi_psns & PHASE;
- else if (ints & INTS_CMD_DONE)
- goto out;
- else {
- scsierror(hs, hd, ints);
- goto abort;
- }
- }
- out:
- /*
- * Reset the card dma logic, setup the dma channel then
- * get the dio part of the card set for a dma xfer.
- */
- hd->scsi_hconf = 0;
- cmd = CSR_IE;
- dmaflags = DMAGO_NOINT;
- if (scsi_pridma)
- dmaflags |= DMAGO_PRI;
- if (bp->b_flags & B_READ)
- dmaflags |= DMAGO_READ;
- if ((hs->sc_flags & SCSI_DMA32) &&
- ((int)bp->b_un.b_addr & 3) == 0 && (bp->b_bcount & 3) == 0) {
- cmd |= CSR_DMA32;
- dmaflags |= DMAGO_LWORD;
- } else
- dmaflags |= DMAGO_WORD;
- dmago(hs->sc_dq.dq_ctlr, bp->b_un.b_addr, bp->b_bcount, dmaflags);
-
- if (bp->b_flags & B_READ) {
- cmd |= CSR_DMAIN;
- phase = DATA_IN_PHASE;
- } else
- phase = DATA_OUT_PHASE;
- /*
- * DMA enable bits must be set after size and direction bits.
- */
- hd->scsi_csr = cmd;
- hd->scsi_csr |= (CSR_DE0 << hs->sc_dq.dq_ctlr);
- /*
- * Setup the SPC for the transfer. We don't want to take
- * first a command complete then a service required interrupt
- * at the end of the transfer so we try to disable the cmd
- * complete by setting the transfer counter to more bytes
- * than we expect. (XXX - This strategy may have to be
- * modified to deal with devices that return variable length
- * blocks, e.g., some tape drives.)
- */
- cmd = SCMD_XFR;
- i = (unsigned)bp->b_bcount;
- if (pad) {
- cmd |= SCMD_PAD;
- /*
- * XXX - If we don't do this, the last 2 or 4 bytes
- * (depending on word/lword DMA) of a read get trashed.
- * It looks like it is necessary for the DMA to complete
- * before the SPC goes into "pad mode"??? Note: if we
- * also do this on a write, the request never completes.
- */
- if (bp->b_flags & B_READ)
- i += 2;
- #ifdef DEBUG
- hs->sc_flags |= SCSI_PAD;
- if (i & 1)
- printf("scsi%d: odd byte count: %d bytes @ %d\n",
- ctlr, i, bp->b_cylin);
- #endif
- } else
- i += 4;
- hd->scsi_tch = i >> 16;
- hd->scsi_tcm = i >> 8;
- hd->scsi_tcl = i;
- hd->scsi_pctl = phase;
- hd->scsi_tmod = 0;
- hd->scsi_scmd = cmd;
- hs->sc_flags |= SCSI_IO;
- return (0);
- abort:
- scsiabort(hs, hd, "go");
- dmafree(&hs->sc_dq);
- return (1);
- }
-
- void
- scsidone(unit)
- register int unit;
- {
- volatile register struct scsidevice *hd =
- (struct scsidevice *)scsi_softc[unit].sc_hc->hp_addr;
-
- #ifdef DEBUG
- if (scsi_debug)
- printf("scsi%d: done called!\n");
- #endif
- /* dma operation is done -- turn off card dma */
- hd->scsi_csr &=~ (CSR_DE1|CSR_DE0);
- }
-
- int
- scsiintr(unit)
- register int unit;
- {
- register struct scsi_softc *hs = &scsi_softc[unit];
- volatile register struct scsidevice *hd =
- (struct scsidevice *)hs->sc_hc->hp_addr;
- register u_char ints;
- register struct devqueue *dq;
-
- if ((hd->scsi_csr & (CSR_IE|CSR_IR)) != (CSR_IE|CSR_IR))
- return (0);
-
- ints = hd->scsi_ints;
- if ((ints & INTS_SRV_REQ) && (hs->sc_flags & SCSI_IO)) {
- /*
- * this should be the normal i/o completion case.
- * get the status & cmd complete msg then let the
- * device driver look at what happened.
- */
- #ifdef DEBUG
- int len = (hd->scsi_tch << 16) | (hd->scsi_tcm << 8) |
- hd->scsi_tcl;
- if (!(hs->sc_flags & SCSI_PAD))
- len -= 4;
- hs->sc_flags &=~ SCSI_PAD;
- #endif
- dq = hs->sc_sq.dq_forw;
- finishxfer(hs, hd, dq->dq_slave);
- hs->sc_flags &=~ SCSI_IO;
- dmafree(&hs->sc_dq);
- (dq->dq_driver->d_intr)(dq->dq_unit, hs->sc_stat[0]);
- } else {
- /* Something unexpected happened -- deal with it. */
- hd->scsi_ints = ints;
- hd->scsi_csr = 0;
- scsierror(hs, hd, ints);
- scsiabort(hs, hd, "intr");
- if (hs->sc_flags & SCSI_IO) {
- hs->sc_flags &=~ SCSI_IO;
- dmafree(&hs->sc_dq);
- dq = hs->sc_sq.dq_forw;
- (dq->dq_driver->d_intr)(dq->dq_unit, -1);
- }
- }
- return(1);
- }
-
- void
- scsifree(dq)
- register struct devqueue *dq;
- {
- register struct devqueue *hq;
-
- hq = &scsi_softc[dq->dq_ctlr].sc_sq;
- remque(dq);
- if ((dq = hq->dq_forw) != hq)
- (dq->dq_driver->d_start)(dq->dq_unit);
- }
-
- /*
- * (XXX) The following routine is needed for the SCSI tape driver
- * to read odd-size records.
- */
-
- #include "st.h"
- #if NST > 0
- int
- scsi_tt_oddio(ctlr, slave, unit, buf, len, b_flags, freedma)
- int ctlr, slave, unit, b_flags;
- u_char *buf;
- u_int len;
- {
- register struct scsi_softc *hs = &scsi_softc[ctlr];
- struct scsi_cdb6 cdb;
- u_char iphase;
- int stat;
-
- /*
- * First free any DMA channel that was allocated.
- * We can't use DMA to do this transfer.
- */
- if (freedma)
- dmafree(hs->sc_dq);
- /*
- * Initialize command block
- */
- bzero(&cdb, sizeof(cdb));
- cdb.lun = unit;
- cdb.lbam = (len >> 16) & 0xff;
- cdb.lbal = (len >> 8) & 0xff;
- cdb.len = len & 0xff;
- if (buf == 0) {
- cdb.cmd = CMD_SPACE;
- cdb.lun |= 0x00;
- len = 0;
- iphase = MESG_IN_PHASE;
- } else if (b_flags & B_READ) {
- cdb.cmd = CMD_READ;
- iphase = DATA_IN_PHASE;
- } else {
- cdb.cmd = CMD_WRITE;
- iphase = DATA_OUT_PHASE;
- }
- /*
- * Perform command (with very long delays)
- */
- scsi_delay(30000000);
- stat = scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len, iphase);
- scsi_delay(0);
- return (stat);
- }
- #endif
- #endif
-