/* $NetBSD: atzsc.c,v 1.20 1996/10/13 03:06:48 christos Exp $ */ /* * Copyright (c) 1994 Christian E. Hopps * Copyright (c) 1982, 1990 The Regents of the University of California. * All rights reserved. * * 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. * * @(#)dma.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void atzscattach __P((struct device *, struct device *, void *)); int atzscmatch __P((struct device *, void *, void *)); void atzsc_enintr __P((struct sbic_softc *)); void atzsc_dmastop __P((struct sbic_softc *)); int atzsc_dmanext __P((struct sbic_softc *)); int atzsc_dmaintr __P((void *)); int atzsc_dmago __P((struct sbic_softc *, char *, int, int)); #ifdef DEBUG void atzsc_dump __P((void)); #endif struct scsi_adapter atzsc_scsiswitch = { sbic_scsicmd, sbic_minphys, 0, /* no lun support */ 0, /* no lun support */ }; struct scsi_device atzsc_scsidev = { NULL, /* use default error handler */ NULL, /* do not have a start functio */ NULL, /* have no async handler */ NULL, /* Use default done routine */ }; #ifdef DEBUG int atzsc_dmadebug = 0; #endif struct cfattach atzsc_ca = { sizeof(struct sbic_softc), atzscmatch, atzscattach }; struct cfdriver atzsc_cd = { NULL, "atzsc", DV_DULL, NULL, 0 }; /* * if we are an A3000 we are here. */ int atzscmatch(pdp, match, auxp) struct device *pdp; void *match, *auxp; { struct zbus_args *zap; zap = auxp; /* * Check manufacturer and product id. * I was informed that older boards can be 2 also. */ if (zap->manid == 514 && (zap->prodid == 3 || zap->prodid == 2)) return(1); else return(0); } void atzscattach(pdp, dp, auxp) struct device *pdp, *dp; void *auxp; { volatile struct sdmac *rp; struct sbic_softc *sc; struct zbus_args *zap; zap = auxp; sc = (struct sbic_softc *)dp; sc->sc_cregs = rp = zap->va; /* * disable ints and reset bank register */ rp->CNTR = CNTR_PDMD; rp->DAWR = DAWR_ATZSC; sc->sc_enintr = atzsc_enintr; sc->sc_dmago = atzsc_dmago; sc->sc_dmanext = atzsc_dmanext; sc->sc_dmastop = atzsc_dmastop; sc->sc_dmacmd = 0; /* * only 24 bit mem. */ sc->sc_flags |= SBICF_BADDMA; sc->sc_dmamask = ~0x00ffffff; #if 0 /* * If the users kva space is not ztwo try and allocate a bounce buffer. * XXX this needs to change if we move to multiple memory segments. */ if (kvtop(sc) & sc->sc_dmamask) { sc->sc_dmabuffer = (char *)alloc_z2mem(MAXPHYS * 8); /* XXX */ if (isztwomem(sc->sc_dmabuffer)) printf(" bounce pa 0x%x", kvtop(sc->sc_dmabuffer)); else if (sc->sc_dmabuffer) printf(" bounce pa 0x%x", PREP_DMA_MEM(sc->sc_dmabuffer)); } #endif sc->sc_sbicp = (sbic_regmap_p) ((int)rp + 0x91); sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 77; printf(": dmamask 0x%lx\n", ~sc->sc_dmamask); sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE; sc->sc_link.adapter_softc = sc; sc->sc_link.adapter_target = 7; sc->sc_link.adapter = &atzsc_scsiswitch; sc->sc_link.device = &atzsc_scsidev; sc->sc_link.openings = 2; sbicinit(sc); sc->sc_isr.isr_intr = atzsc_dmaintr; sc->sc_isr.isr_arg = sc; sc->sc_isr.isr_ipl = 2; add_isr (&sc->sc_isr); /* * attach all scsi units on us */ config_found(dp, &sc->sc_link, scsiprint); } void atzsc_enintr(dev) struct sbic_softc *dev; { volatile struct sdmac *sdp; sdp = dev->sc_cregs; dev->sc_flags |= SBICF_INTR; sdp->CNTR = CNTR_PDMD | CNTR_INTEN; } int atzsc_dmago(dev, addr, count, flags) struct sbic_softc *dev; char *addr; int count, flags; { volatile struct sdmac *sdp; sdp = dev->sc_cregs; /* * Set up the command word based on flags */ dev->sc_dmacmd = CNTR_PDMD | CNTR_INTEN; if ((flags & DMAGO_READ) == 0) dev->sc_dmacmd |= CNTR_DDIR; #ifdef DEBUG if (atzsc_dmadebug & DDB_IO) printf("atzsc_dmago: cmd %x\n", dev->sc_dmacmd); #endif dev->sc_flags |= SBICF_INTR; sdp->CNTR = dev->sc_dmacmd; sdp->ACR = (u_int) dev->sc_cur->dc_addr; sdp->ST_DMA = 1; return(dev->sc_tcnt); } void atzsc_dmastop(dev) struct sbic_softc *dev; { volatile struct sdmac *sdp; int s; sdp = dev->sc_cregs; #ifdef DEBUG if (atzsc_dmadebug & DDB_FOLLOW) printf("atzsc_dmastop()\n"); #endif if (dev->sc_dmacmd) { s = splbio(); if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) { /* * only FLUSH if terminal count not enabled, * and reading from peripheral */ sdp->FLUSH = 1; while ((sdp->ISTR & ISTR_FE_FLG) == 0) ; } /* * clear possible interrupt and stop dma */ sdp->CINT = 1; sdp->SP_DMA = 1; dev->sc_dmacmd = 0; splx(s); } } int atzsc_dmaintr(arg) void *arg; { struct sbic_softc *dev = arg; volatile struct sdmac *sdp; int stat, found; sdp = dev->sc_cregs; stat = sdp->ISTR; if ((stat & (ISTR_INT_F|ISTR_INT_P)) == 0) return (0); #ifdef DEBUG if (atzsc_dmadebug & DDB_FOLLOW) printf("%s: dmaintr 0x%x\n", dev->sc_dev.dv_xname, stat); #endif /* * both, SCSI and DMA interrupts arrive here. I chose * arbitrarily that DMA interrupts should have higher * precedence than SCSI interrupts. */ found = 0; if (stat & ISTR_E_INT) { found++; sdp->CINT = 1; /* clear possible interrupt */ /* * check for SCSI ints in the same go and * eventually save an interrupt */ } if (dev->sc_flags & SBICF_INTR && stat & ISTR_INTS) found += sbicintr(dev); return(found); } int atzsc_dmanext(dev) struct sbic_softc *dev; { volatile struct sdmac *sdp; sdp = dev->sc_cregs; if (dev->sc_cur > dev->sc_last) { /* shouldn't happen !! */ printf("atzsc_dmanext at end !!!\n"); atzsc_dmastop(dev); return(0); } if ((dev->sc_dmacmd & (CNTR_TCEN | CNTR_DDIR)) == 0) { /* * only FLUSH if terminal count not enabled, * and reading from peripheral */ sdp->FLUSH = 1; while ((sdp->ISTR & ISTR_FE_FLG) == 0) ; } /* * clear possible interrupt and stop dma */ sdp->CINT = 1; /* clear possible interrupt */ sdp->SP_DMA = 1; /* stop dma */ sdp->CNTR = dev->sc_dmacmd; sdp->ACR = (u_int)dev->sc_cur->dc_addr; sdp->ST_DMA = 1; dev->sc_tcnt = dev->sc_cur->dc_count << 1; return(dev->sc_tcnt); } #ifdef DEBUG void atzsc_dump() { int i; for (i = 0; i < atzsc_cd.cd_ndevs; ++i) if (atzsc_cd.cd_devs[i]) sbic_dump(atzsc_cd.cd_devs[i]); } #endif