323 lines
7.4 KiB
C
323 lines
7.4 KiB
C
/* $NetBSD: ahsc.c,v 1.16 1996/10/13 03:06:46 christos Exp $ */
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/*
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* Copyright (c) 1994 Christian E. Hopps
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* Copyright (c) 1982, 1990 The Regents of the University of California.
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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 by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)dma.c
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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/kernel.h>
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#include <sys/device.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#include <amiga/amiga/custom.h>
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#include <amiga/amiga/cc.h>
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#include <amiga/amiga/device.h>
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#include <amiga/amiga/isr.h>
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#include <amiga/dev/dmavar.h>
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#include <amiga/dev/sbicreg.h>
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#include <amiga/dev/sbicvar.h>
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#include <amiga/dev/ahscreg.h>
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#include <amiga/dev/zbusvar.h>
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void ahscattach __P((struct device *, struct device *, void *));
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int ahscmatch __P((struct device *, void *, void *));
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void ahsc_enintr __P((struct sbic_softc *));
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void ahsc_dmastop __P((struct sbic_softc *));
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int ahsc_dmanext __P((struct sbic_softc *));
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int ahsc_dmaintr __P((void *));
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int ahsc_dmago __P((struct sbic_softc *, char *, int, int));
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#ifdef DEBUG
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void ahsc_dump __P((void));
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#endif
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struct scsi_adapter ahsc_scsiswitch = {
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sbic_scsicmd,
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sbic_minphys,
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0, /* no lun support */
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0, /* no lun support */
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};
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struct scsi_device ahsc_scsidev = {
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NULL, /* use default error handler */
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NULL, /* do not have a start functio */
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NULL, /* have no async handler */
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NULL, /* Use default done routine */
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};
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#ifdef DEBUG
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int ahsc_dmadebug = 0;
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#endif
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struct cfattach ahsc_ca = {
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sizeof(struct sbic_softc), ahscmatch, ahscattach
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};
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struct cfdriver ahsc_cd = {
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NULL, "ahsc", DV_DULL, NULL, 0
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};
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/*
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* if we are an A3000 we are here.
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*/
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int
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ahscmatch(pdp, match, auxp)
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struct device *pdp;
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void *match, *auxp;
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{
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char *mbusstr;
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mbusstr = auxp;
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if (is_a3000() && matchname(auxp, "ahsc"))
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return(1);
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return(0);
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}
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void
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ahscattach(pdp, dp, auxp)
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struct device *pdp, *dp;
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void *auxp;
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{
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volatile struct sdmac *rp;
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struct sbic_softc *sc;
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printf("\n");
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sc = (struct sbic_softc *)dp;
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sc->sc_cregs = rp = ztwomap(0xdd0000);
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/*
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* disable ints and reset bank register
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*/
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rp->CNTR = CNTR_PDMD;
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rp->DAWR = DAWR_AHSC;
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sc->sc_enintr = ahsc_enintr;
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sc->sc_dmago = ahsc_dmago;
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sc->sc_dmanext = ahsc_dmanext;
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sc->sc_dmastop = ahsc_dmastop;
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sc->sc_dmacmd = 0;
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/*
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* eveything is a valid dma address
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*/
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sc->sc_dmamask = 0;
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sc->sc_sbicp = (sbic_regmap_p) ((int)rp + 0x41);
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sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 143;
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sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE;
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sc->sc_link.adapter_softc = sc;
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sc->sc_link.adapter_target = 7;
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sc->sc_link.adapter = &ahsc_scsiswitch;
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sc->sc_link.device = &ahsc_scsidev;
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sc->sc_link.openings = 2;
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sbicinit(sc);
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sc->sc_isr.isr_intr = ahsc_dmaintr;
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sc->sc_isr.isr_arg = sc;
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sc->sc_isr.isr_ipl = 2;
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add_isr (&sc->sc_isr);
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/*
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* attach all scsi units on us
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*/
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config_found(dp, &sc->sc_link, scsiprint);
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}
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void
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ahsc_enintr(dev)
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struct sbic_softc *dev;
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{
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volatile struct sdmac *sdp;
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sdp = dev->sc_cregs;
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dev->sc_flags |= SBICF_INTR;
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sdp->CNTR = CNTR_PDMD | CNTR_INTEN;
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}
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int
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ahsc_dmago(dev, addr, count, flags)
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struct sbic_softc *dev;
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char *addr;
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int count, flags;
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{
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volatile struct sdmac *sdp;
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sdp = dev->sc_cregs;
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/*
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* Set up the command word based on flags
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*/
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dev->sc_dmacmd = CNTR_PDMD | CNTR_INTEN;
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if ((flags & DMAGO_READ) == 0)
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dev->sc_dmacmd |= CNTR_DDIR;
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#ifdef DEBUG
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if (ahsc_dmadebug & DDB_IO)
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printf("ahsc_dmago: cmd %x\n", dev->sc_dmacmd);
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#endif
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dev->sc_flags |= SBICF_INTR;
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sdp->CNTR = dev->sc_dmacmd;
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sdp->ACR = (u_int) dev->sc_cur->dc_addr;
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sdp->ST_DMA = 1;
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return(dev->sc_tcnt);
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}
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void
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ahsc_dmastop(dev)
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struct sbic_softc *dev;
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{
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volatile struct sdmac *sdp;
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int s;
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sdp = dev->sc_cregs;
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#ifdef DEBUG
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if (ahsc_dmadebug & DDB_FOLLOW)
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printf("ahsc_dmastop()\n");
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#endif
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if (dev->sc_dmacmd) {
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s = splbio();
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if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) {
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/*
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* only FLUSH if terminal count not enabled,
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* and reading from peripheral
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*/
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sdp->FLUSH = 1;
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while ((sdp->ISTR & ISTR_FE_FLG) == 0)
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;
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}
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/*
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* clear possible interrupt and stop dma
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*/
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sdp->CINT = 1;
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sdp->SP_DMA = 1;
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dev->sc_dmacmd = 0;
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splx(s);
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}
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}
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int
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ahsc_dmaintr(arg)
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void *arg;
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{
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struct sbic_softc *dev = arg;
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volatile struct sdmac *sdp;
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int stat, found;
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sdp = dev->sc_cregs;
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stat = sdp->ISTR;
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if ((stat & (ISTR_INT_F|ISTR_INT_P)) == 0)
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return (0);
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#ifdef DEBUG
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if (ahsc_dmadebug & DDB_FOLLOW)
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printf("%s: dmaintr 0x%x\n", dev->sc_dev.dv_xname, stat);
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#endif
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/*
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* both, SCSI and DMA interrupts arrive here. I chose
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* arbitrarily that DMA interrupts should have higher
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* precedence than SCSI interrupts.
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*/
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found = 0;
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if (stat & ISTR_E_INT) {
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++found;
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sdp->CINT = 1; /* clear possible interrupt */
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/*
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* check for SCSI ints in the same go and
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* eventually save an interrupt
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*/
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}
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if (dev->sc_flags & SBICF_INTR && stat & ISTR_INTS)
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found += sbicintr(dev);
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return(found);
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}
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int
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ahsc_dmanext(dev)
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struct sbic_softc *dev;
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{
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volatile struct sdmac *sdp;
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sdp = dev->sc_cregs;
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if (dev->sc_cur > dev->sc_last) {
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/* shouldn't happen !! */
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printf("ahsc_dmanext at end !!!\n");
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ahsc_dmastop(dev);
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return(0);
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}
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if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) {
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/*
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* only FLUSH if terminal count not enabled,
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* and reading from peripheral
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*/
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sdp->FLUSH = 1;
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while ((sdp->ISTR & ISTR_FE_FLG) == 0)
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;
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}
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/*
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* clear possible interrupt and stop dma
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*/
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sdp->CINT = 1; /* clear possible interrupt */
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sdp->SP_DMA = 1; /* stop dma */
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sdp->CNTR = dev->sc_dmacmd;
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sdp->ACR = (u_int)dev->sc_cur->dc_addr;
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sdp->ST_DMA = 1;
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dev->sc_tcnt = dev->sc_cur->dc_count << 1;
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return(dev->sc_tcnt);
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}
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#ifdef DEBUG
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void
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ahsc_dump()
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{
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int i;
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for (i = 0; i < ahsc_cd.cd_ndevs; ++i)
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if (ahsc_cd.cd_devs[i])
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sbic_dump(ahsc_cd.cd_devs[i]);
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}
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#endif
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