355 lines
8.9 KiB
C
355 lines
8.9 KiB
C
/* $NetBSD: mba.c,v 1.6 1996/04/08 18:38:59 ragge Exp $ */
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/*
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* Copyright (c) 1994, 1996 Ludd, University of Lule}, Sweden.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed at Ludd, University of
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* Lule}, Sweden and its contributors.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Simple massbus drive routine.
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* TODO:
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* Autoconfig new devices 'on the fly'.
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* More intelligent way to handle different interrupts.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/queue.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <machine/trap.h>
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#include <machine/scb.h>
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#include <machine/nexus.h>
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#include <machine/pte.h>
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#include <machine/pcb.h>
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#include <machine/sid.h>
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#include <vax/mba/mbareg.h>
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#include <vax/mba/mbavar.h>
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struct mbaunit mbaunit[] = {
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{MBADT_RP04, "rp04", MB_RP},
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{MBADT_RP05, "rp05", MB_RP},
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{MBADT_RP06, "rp06", MB_RP},
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{MBADT_RP07, "rp07", MB_RP},
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{MBADT_RM02, "rm02", MB_RP},
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{MBADT_RM03, "rm03", MB_RP},
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{MBADT_RM05, "rm05", MB_RP},
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{MBADT_RM80, "rm80", MB_RP},
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{0, 0, 0}
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};
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int mbamatch __P((struct device *, void *, void *));
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void mbaattach __P((struct device *, struct device *, void *));
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void mbaintr __P((int));
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int mbaprint __P((void *, char *));
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void mbaqueue __P((struct mba_device *));
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void mbastart __P((struct mba_softc *));
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void mbamapregs __P((struct mba_softc *));
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struct cfdriver mba_cd = {
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NULL, "mba", DV_DULL
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};
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struct cfattach mba_ca = {
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sizeof(struct mba_softc), mbamatch, mbaattach
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};
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/*
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* Look if this is a massbuss adapter.
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*/
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int
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mbamatch(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct sbi_attach_args *sa = (struct sbi_attach_args *)aux;
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struct cfdata *cf = match;
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if ((cf->cf_loc[0] != sa->nexnum) && (cf->cf_loc[0] > -1 ))
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return 0;
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if (sa->type == NEX_MBA)
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return 1;
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return 0;
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}
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/*
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* Attach the found massbuss adapter. Setup its interrupt vectors,
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* reset it and go searching for drives on it.
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*/
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void
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mbaattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct mba_softc *sc = (void *)self;
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struct sbi_attach_args *sa = (struct sbi_attach_args *)aux;
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volatile struct mba_regs *mbar = (struct mba_regs *)sa->nexaddr;
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struct mba_attach_args ma;
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extern struct ivec_dsp idsptch;
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int i, j;
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printf("\n");
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/*
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* Set up interrupt vectors for this MBA.
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*/
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bcopy(&idsptch, &sc->sc_dsp, sizeof(struct ivec_dsp));
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scb->scb_nexvec[0][sa->nexnum] = scb->scb_nexvec[1][sa->nexnum] =
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scb->scb_nexvec[2][sa->nexnum] = scb->scb_nexvec[3][sa->nexnum] =
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&sc->sc_dsp;
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sc->sc_dsp.pushlarg = sc->sc_dev.dv_unit;
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sc->sc_dsp.hoppaddr = mbaintr;
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sc->sc_physnr = sa->nexnum - 8; /* MBA's have TR between 8 - 11... */
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#ifdef VAX750
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if (cpunumber == VAX_750)
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sc->sc_physnr += 4; /* ...but not on 11/750 */
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#endif
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sc->sc_first = 0;
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sc->sc_last = (void *)&sc->sc_first;
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sc->sc_mbareg = (struct mba_regs *)mbar;
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mbar->mba_cr = MBACR_INIT; /* Reset adapter */
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mbar->mba_cr = MBACR_IE; /* Enable interrupts */
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for (i = 0; i < MAXMBADEV; i++) {
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sc->sc_state = SC_AUTOCONF;
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if ((mbar->mba_md[i].md_ds & MBADS_DPR) == 0)
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continue;
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/* We have a drive, ok. */
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ma.unit = i;
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ma.type = mbar->mba_md[i].md_dt & 0777;
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j = 0;
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while (mbaunit[j++].nr)
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if (mbaunit[j].nr == ma.type)
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break;
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ma.devtyp = mbaunit[j].devtyp;
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ma.name = mbaunit[j].name;
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config_found(&sc->sc_dev, (void *)&ma, mbaprint);
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}
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}
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/*
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* We got an interrupt. Check type of interrupt and call the specific
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* device interrupt handling routine.
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*/
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void
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mbaintr(mba)
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int mba;
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{
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struct mba_softc *sc = mba_cd.cd_devs[mba];
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volatile struct mba_regs *mr = sc->sc_mbareg;
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struct mba_device *md;
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struct buf *bp;
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int itype, attn, anr;
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itype = mr->mba_sr;
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mr->mba_sr = itype; /* Write back to clear bits */
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attn = mr->mba_md[0].md_as & 0xff;
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mr->mba_md[0].md_as = attn;
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if (sc->sc_state == SC_AUTOCONF)
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return; /* During autoconfig */
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md = sc->sc_first;
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bp = md->md_q.b_actf;
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/*
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* A data-transfer interrupt. Current operation is finished,
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* call that device's finish routine to see what to do next.
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*/
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if (sc->sc_state == SC_ACTIVE) {
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sc->sc_state = SC_IDLE;
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switch ((*md->md_finish)(md, itype, &attn)) {
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case XFER_FINISH:
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/*
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* Transfer is finished. Take buffer of drive
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* queue, and take drive of adapter queue.
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* If more to transfer, start the adapter again
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* by calling mbastart().
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*/
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md->md_q.b_actf = bp->b_actf;
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sc->sc_first = md->md_back;
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md->md_back = 0;
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if (sc->sc_first == 0)
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sc->sc_last = (void *)&sc->sc_first;
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if (md->md_q.b_actf) {
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sc->sc_last->md_back = md;
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sc->sc_last = md;
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}
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bp->b_resid = 0;
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biodone(bp);
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if (sc->sc_first)
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mbastart(sc);
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break;
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case XFER_RESTART:
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/*
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* Something went wrong with the transfer. Try again.
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*/
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mbastart(sc);
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break;
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}
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}
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while (attn) {
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anr = ffs(attn) - 1;
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attn &= ~(1 << anr);
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if (sc->sc_md[anr]->md_attn == 0)
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panic("Should check for new MBA device %d", anr);
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(*sc->sc_md[anr]->md_attn)(sc->sc_md[anr]);
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}
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}
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int
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mbaprint(aux, mbaname)
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void *aux;
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char *mbaname;
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{
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struct mba_attach_args *ma = aux;
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if (mbaname) {
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if (ma->name)
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printf("%s", ma->name);
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else
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printf("device type %o", ma->type);
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printf(" at %s", mbaname);
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}
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printf(" drive %d", ma->unit);
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return (ma->name ? UNCONF : UNSUPP);
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}
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/*
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* A device calls mbaqueue() when it wants to get on the adapter queue.
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* Called at splbio(). If the adapter is inactive, start it.
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*/
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void
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mbaqueue(md)
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struct mba_device *md;
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{
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struct mba_softc *sc = md->md_mba;
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int i = (int)sc->sc_first;
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sc->sc_last->md_back = md;
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sc->sc_last = md;
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if (i == 0)
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mbastart(sc);
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}
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/*
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* Start activity on (idling) adapter. Calls mbamapregs() to setup
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* for dma transfer, then the unit-specific start routine.
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*/
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void
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mbastart(sc)
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struct mba_softc *sc;
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{
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struct mba_device *md = sc->sc_first;
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volatile struct mba_regs *mr = sc->sc_mbareg;
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struct buf *bp = md->md_q.b_actf;
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mbamapregs(sc);
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sc->sc_state = SC_ACTIVE;
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mr->mba_var = ((u_int)bp->b_un.b_addr & PGOFSET);
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mr->mba_bc = (~bp->b_bcount) + 1;
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(*md->md_start)(md); /* machine-dependent start */
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}
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/*
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* Setup map registers for a dma transfer.
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* This routine could be synced with the other adapter map routines!
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*/
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void
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mbamapregs(sc)
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struct mba_softc *sc;
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{
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struct mba_device *md = sc->sc_first;
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volatile struct mba_regs *mr = sc->sc_mbareg;
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struct buf *bp = md->md_q.b_actf;
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struct pcb *pcb;
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pt_entry_t *pte;
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volatile pt_entry_t *io;
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int pfnum, npf, o, i;
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caddr_t addr;
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o = (int)bp->b_un.b_addr & PGOFSET;
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npf = btoc(bp->b_bcount + o) + 1;
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addr = bp->b_un.b_addr;
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/*
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* Get a pointer to the pte pointing out the first virtual address.
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* Use different ways in kernel and user space.
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*/
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if ((bp->b_flags & B_PHYS) == 0) {
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pte = kvtopte(addr);
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} else {
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pcb = bp->b_proc->p_vmspace->vm_pmap.pm_pcb;
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pte = uvtopte(addr, pcb);
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}
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/*
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* When we are doing DMA to user space, be sure that all pages
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* we want to transfer to is mapped. WHY DO WE NEED THIS???
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* SHOULDN'T THEY ALWAYS BE MAPPED WHEN DOING THIS???
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*/
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for (i = 0; i < (npf - 1); i++) {
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if ((pte + i)->pg_pfn == 0) {
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int rv;
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rv = vm_fault(&bp->b_proc->p_vmspace->vm_map,
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(unsigned)addr + i * NBPG,
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VM_PROT_READ|VM_PROT_WRITE, FALSE);
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if (rv)
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panic("MBA DMA to nonexistent page, %d", rv);
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}
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}
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io = &mr->mba_map[0];
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while (--npf > 0) {
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pfnum = pte->pg_pfn;
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if (pfnum == 0)
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panic("mba zero entry");
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pte++;
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*(int *)io++ = pfnum | PG_V;
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}
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*(int *)io = 0;
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}
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