316 lines
8.5 KiB
C
316 lines
8.5 KiB
C
/* $NetBSD: kdb.c,v 1.4 1996/10/13 03:34:47 christos Exp $ */
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/*
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* Copyright (c) 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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* KDB50 disk device driver
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*/
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/*
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* TODO
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* Implement node reset routine.
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* Nices hardware error handling.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <machine/sid.h>
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#include <machine/pte.h>
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#include <machine/pcb.h>
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#include <machine/trap.h>
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#include <machine/scb.h>
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#include <vax/bi/bireg.h>
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#include <vax/bi/bivar.h>
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#include <vax/bi/kdbreg.h>
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#include <vax/mscp/mscp.h>
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#include <vax/mscp/mscpvar.h>
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#include <vax/mscp/mscpreg.h>
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#define b_forw b_hash.le_next
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/*
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* Software status, per controller.
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*/
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struct kdb_softc {
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struct device sc_dev; /* Autoconfig info */
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struct ivec_dsp sc_ivec; /* Interrupt vector handler */
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struct mscp_pack sc_kdb; /* Struct for kdb communication */
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struct buf sc_ktab; /* queue for waiting xfers */
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struct mscp_softc *sc_softc; /* MSCP info (per mscpvar.h) */
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struct kdb_regs *sc_kr; /* KDB controller registers */
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struct mscp *sc_mscp; /* Keep pointer to active mscp */
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};
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int kdbmatch __P((struct device *, void *, void *));
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void kdbattach __P((struct device *, struct device *, void *));
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void kdbreset __P((int));
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void kdbintr __P((int));
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void kdbctlrdone __P((struct device *, int));
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int kdbprint __P((void *, const char *));
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void kdbsaerror __P((struct device *, int));
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int kdbgo __P((struct device *));
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struct cfdriver kdb_cd = {
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NULL, "kdb", DV_DULL
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};
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struct cfattach kdb_ca = {
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sizeof(struct kdb_softc), kdbmatch, kdbattach
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};
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/*
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* More driver definitions, for generic MSCP code.
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*/
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struct mscp_ctlr kdb_mscp_ctlr = {
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kdbctlrdone,
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kdbgo,
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kdbsaerror,
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};
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int
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kdbprint(aux, name)
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void *aux;
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const char *name;
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{
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if (name)
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printf("%s: mscpbus", name);
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return UNCONF;
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}
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/*
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* Poke at a supposed KDB to see if it is there.
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*/
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int
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kdbmatch(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 cfdata *cf = match;
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struct bi_attach_args *ba = aux;
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if (ba->ba_node->biic.bi_dtype != BIDT_KDB50)
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return 0;
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if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != ba->ba_nodenr)
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return 0;
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return 1;
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}
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void
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kdbattach(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 kdb_softc *sc = (void *)self;
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struct bi_attach_args *ba = aux;
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struct mscp_attach_args ma;
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extern struct ivec_dsp idsptch;
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volatile int i = 10000;
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printf("\n");
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bcopy(&idsptch, &sc->sc_ivec, sizeof(struct ivec_dsp));
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scb->scb_nexvec[1][ba->ba_nodenr] = &sc->sc_ivec;
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sc->sc_ivec.hoppaddr = kdbintr;
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sc->sc_ivec.pushlarg = self->dv_unit;
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sc->sc_kr = (void *)ba->ba_node;
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bzero(&sc->sc_kdb, sizeof (struct mscp_pack));
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ma.ma_mc = &kdb_mscp_ctlr;
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ma.ma_type = MSCPBUS_DISK|MSCPBUS_KDB;
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ma.ma_cbuf = &sc->sc_ktab;
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ma.ma_uuda = (struct mscp_pack *)kvtophys(&sc->sc_kdb);
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ma.ma_uda = &sc->sc_kdb;
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ma.ma_ip = &sc->sc_kr->kdb_ip;
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ma.ma_sa = &sc->sc_kr->kdb_sa;
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ma.ma_sw = &sc->sc_kr->kdb_sw;
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ma.ma_softc = &sc->sc_softc;
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ma.ma_ivec = (int)&scb->scb_nexvec[1][ba->ba_nodenr] - (int)scb;
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ma.ma_ctlrnr = ba->ba_nodenr;
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sc->sc_kr->kdb_bi.bi_csr |= BICSR_NRST;
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while (i--) /* Need delay??? */
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;
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sc->sc_kr->kdb_bi.bi_intrdes = ba->ba_intcpu;
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sc->sc_kr->kdb_bi.bi_bcicsr |= BCI_STOPEN | BCI_IDENTEN | BCI_UINTEN |
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BCI_INTEN;
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sc->sc_kr->kdb_bi.bi_uintrcsr = ma.ma_ivec;
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config_found(&sc->sc_dev, &ma, kdbprint);
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}
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int
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kdbgo(usc)
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struct device *usc;
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{
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struct kdb_softc *sc = (void *)usc;
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struct buf *bp = sc->sc_ktab.b_forw->b_actf;
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struct mscp_softc *mi = sc->sc_softc;
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struct mscp *mp = mi->mi_mscp;
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struct pcb *pcb;
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pt_entry_t *pte;
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int pfnum, npf, o, i;
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unsigned info = 0;
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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("KDB DMA to nonexistent page, %d", rv);
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}
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}
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/*
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* pte's for userspace isn't necessary positioned
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* in consecutive physical pages. We check if they
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* are, otherwise we need to copy the pte's to a
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* physically contigouos page area.
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* XXX some copying here may be unneccessary. Subject to fix.
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*/
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if (bp->b_flags & B_PHYS) {
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int i = kvtophys(pte);
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unsigned k;
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if (trunc_page(i) != trunc_page(kvtophys(pte) + npf * 4)) {
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info = (unsigned)malloc(2 * NBPG, M_DEVBUF, M_WAITOK);
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k = (info + PGOFSET) & ~PGOFSET;
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bcopy(pte, (void *)k, NBPG);
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i = kvtophys(k);
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}
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mp->mscp_seq.seq_mapbase = i;
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} else
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mp->mscp_seq.seq_mapbase = (unsigned)pte;
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mscp_dgo(mi, KDB_MAP | o, info);
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return 1;
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}
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void
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kdbsaerror(usc, doreset)
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struct device *usc;
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int doreset;
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{
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struct kdb_softc *sc = (void *)usc;
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register int code = sc->sc_kr->kdb_sa;
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if ((code & MP_ERR) == 0)
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return;
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printf("%s: controller error, sa=0x%x\n", sc->sc_dev.dv_xname, code);
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/* What to do now??? */
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}
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/*
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* Interrupt routine. Depending on the state of the controller,
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* continue initialisation, or acknowledge command and response
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* interrupts, and process responses.
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*/
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void
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kdbintr(ctlr)
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int ctlr;
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{
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struct kdb_softc *sc = kdb_cd.cd_devs[ctlr];
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struct uba_softc *uh;
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struct mscp_pack *ud;
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if (sc->sc_kr->kdb_sa & MP_ERR) { /* ctlr fatal error */
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kdbsaerror(&sc->sc_dev, 1);
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return;
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}
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mscp_intr(sc->sc_softc);
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}
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#ifdef notyet
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/*
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* The KDB50 has been reset. Reinitialise the controller
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* and requeue outstanding I/O.
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*/
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void
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kdbreset(ctlr)
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int ctlr;
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{
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register struct kdb_softc *sc;
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sc = kdb_cd.cd_devs[ctlr];
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printf(" kdb%d", ctlr);
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/* reset queues and requeue pending transfers */
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mscp_requeue(sc->sc_softc);
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/*
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* If it fails to initialise we will notice later and
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* try again (and again...). Do not call kdbstart()
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* here; it will be done after the controller finishes
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* initialisation.
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*/
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if (kdbinit(sc))
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printf(" (hung)");
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}
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#endif
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void
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kdbctlrdone(usc, info)
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struct device *usc;
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int info;
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{
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if (info)
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free((void *)info, NBPG * 2);
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}
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