/*      $NetBSD: atzsc.c,v 1.45 2021/08/07 16:18:41 thorpej Exp $ */

/*
 * 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. 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
 */

/*
 * Copyright (c) 1994 Christian E. Hopps
 *
 * 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: atzsc.c,v 1.45 2021/08/07 16:18:41 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <machine/cpu.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <amiga/amiga/custom.h>
#include <amiga/amiga/cc.h>
#include <amiga/amiga/device.h>
#include <amiga/amiga/isr.h>
#include <amiga/dev/dmavar.h>
#include <amiga/dev/sbicreg.h>
#include <amiga/dev/sbicvar.h>
#include <amiga/dev/atzscreg.h>
#include <amiga/dev/zbusvar.h>

void atzscattach(device_t, device_t, void *);
int atzscmatch(device_t, cfdata_t, void *);

void atzsc_enintr(struct sbic_softc *);
void atzsc_dmastop(struct sbic_softc *);
int atzsc_dmanext(struct sbic_softc *);
int atzsc_dmaintr(void *);
int atzsc_dmago(struct sbic_softc *, char *, int, int);

#ifdef DEBUG
void atzsc_dump(void);
#endif

#ifdef DEBUG
int     atzsc_dmadebug = 0;
#endif

CFATTACH_DECL_NEW(atzsc, sizeof(struct sbic_softc),
    atzscmatch, atzscattach, NULL, NULL);

/*
 * if we are a A2091 SCSI
 */
int
atzscmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct zbus_args *zap;

        zap = aux;

        /*
         * 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(device_t parent, device_t self, void *aux)
{
        volatile struct sdmac *rp;
        struct sbic_softc *sc = device_private(self);
        struct zbus_args *zap;
        struct scsipi_adapter *adapt = &sc->sc_adapter;
        struct scsipi_channel *chan = &sc->sc_channel;

        zap = aux;

        sc->sc_dev = self;
        sc->sc_cregs = rp = zap->va;
        /*
         * disable ints and reset bank register
         */
        rp->CNTR = CNTR_PDMD;
        amiga_membarrier();
        rp->DAWR = DAWR_ATZSC;
        amiga_membarrier();
        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_sbic.sbic_asr_p = (volatile unsigned char *)rp + 0x91;
        sc->sc_sbic.sbic_value_p = (volatile unsigned char *)rp + 0x93;

        sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 77;

        printf(": dmamask 0x%lx\n", ~sc->sc_dmamask);

        /*
         * Fill in the scsipi_adapter.
         */
        memset(adapt, 0, sizeof(*adapt));
        adapt->adapt_dev = self;
        adapt->adapt_nchannels = 1;
        adapt->adapt_openings = 7;
        adapt->adapt_max_periph = 1;
        adapt->adapt_request = sbic_scsipi_request;
        adapt->adapt_minphys = sbic_minphys;

        /*
         * Fill in the scsipi_channel.
         */
        memset(chan, 0, sizeof(*chan));
        chan->chan_adapter = adapt;
        chan->chan_bustype = &scsi_bustype;
        chan->chan_channel = 0;
        chan->chan_ntargets = 8;
        chan->chan_nluns = 8;
        chan->chan_id = 7;

        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(self, chan, scsiprint, CFARGS_NONE);
}

void
atzsc_enintr(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;

        sdp = dev->sc_cregs;

        dev->sc_flags |= SBICF_INTR;
        sdp->CNTR = CNTR_PDMD | CNTR_INTEN;
        amiga_membarrier();
}

int
atzsc_dmago(struct sbic_softc *dev, char *addr, int count, int 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;
        amiga_membarrier();
        sdp->ACR = (u_int) dev->sc_cur->dc_addr;
        amiga_membarrier();
        sdp->ST_DMA = 1;
        amiga_membarrier();

        return(dev->sc_tcnt);
}

void
atzsc_dmastop(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;
        int s;
        vu_short istr;

        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;
                        amiga_membarrier();
                        do {
                                istr = sdp->ISTR;
                                amiga_membarrier();
                        } while ((istr & ISTR_FE_FLG) == 0);
                }
                /*
                 * clear possible interrupt and stop DMA
                 */
                sdp->CINT = 1;
                amiga_membarrier();
                sdp->SP_DMA = 1;
                amiga_membarrier();
                dev->sc_dmacmd = 0;
                splx(s);
        }
}

int
atzsc_dmaintr(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", device_xname(dev->sc_dev), 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 */
                amiga_membarrier();

                /*
                 * 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(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;
        vu_short istr;

        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;
                amiga_membarrier();
                do {
                        istr = sdp->ISTR;
                        amiga_membarrier();
                } while ((istr & ISTR_FE_FLG) == 0);
        }
        /*
         * clear possible interrupt and stop DMA
         */
        sdp->CINT = 1;  /* clear possible interrupt */
        amiga_membarrier();
        sdp->SP_DMA = 1;        /* stop DMA */
        amiga_membarrier();
        sdp->CNTR = dev->sc_dmacmd;
        amiga_membarrier();
        sdp->ACR = (u_int)dev->sc_cur->dc_addr;
        amiga_membarrier();
        sdp->ST_DMA = 1;
        amiga_membarrier();

        dev->sc_tcnt = dev->sc_cur->dc_count << 1;
        return(dev->sc_tcnt);
}

#ifdef DEBUG
void
atzsc_dump(void)
{
        extern struct cfdriver atzsc_cd;
        struct sbic_softc *sc;
        int i;

        for (i = 0; i < atzsc_cd.cd_ndevs; ++i) {
                sc = device_lookup_private(&atzsc_cd, i);
                if (sc != NULL)
                        sbic_dump(sc);
        }
}
#endif