/*      $NetBSD: ahsc.c,v 1.40 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: ahsc.c,v 1.40 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 <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/cfdev.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/ahscreg.h>
#include <amiga/dev/zbusvar.h>

#include <machine/cpu.h>

void ahscattach(device_t, device_t, void *);
int ahscmatch(device_t, cfdata_t, void *);

void ahsc_enintr(struct sbic_softc *);
void ahsc_dmastop(struct sbic_softc *);
int ahsc_dmanext(struct sbic_softc *);
int ahsc_dmaintr(void *);
int ahsc_dmago(struct sbic_softc *, char *, int, int);

#ifdef DEBUG
void ahsc_dump(void);
#endif

#ifdef DEBUG
int     ahsc_dmadebug = 0;
#endif

CFATTACH_DECL_NEW(ahsc, sizeof(struct sbic_softc),
    ahscmatch, ahscattach, NULL, NULL);

/*
 * if we are an A3000 we are here.
 */
int
ahscmatch(device_t parent, cfdata_t cf, void *aux)
{

        if (is_a3000() && matchname(aux, "ahsc"))
                return(1);
        return(0);
}

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

        sc->sc_dev = self;

        ecdp = &cfdev[ncfdev];

        for (cdp = cfdev; cdp < ecdp; cdp++) {
                if (cdp->rom.manid == 8738 &&
                    cdp->rom.prodid == 35)
                                break;
        }

        sc->sc_cregs = rp = ztwomap(0xdd0000);
        /*
         * disable ints and reset bank register
         */
        rp->CNTR = CNTR_PDMD;
        amiga_membarrier();
        rp->DAWR = DAWR_AHSC;
        amiga_membarrier();
        sc->sc_enintr = ahsc_enintr;
        sc->sc_dmago = ahsc_dmago;
        sc->sc_dmanext = ahsc_dmanext;
        sc->sc_dmastop = ahsc_dmastop;
        sc->sc_dmacmd = 0;

        /*
         * everything is a valid DMA address
         */
        sc->sc_dmamask = 0;

        if (cdp < ecdp) {
                sc->sc_sbic.sbic_asr_p =  ((vu_char *)rp + 0x43);
                sc->sc_sbic.sbic_value_p =  ((vu_char *)rp + 0x47);
                printf(": modified for Apollo CPU board\n");
        } else {
                sc->sc_sbic.sbic_asr_p =  ((vu_char *)rp + 0x41);
                sc->sc_sbic.sbic_value_p =  ((vu_char *)rp + 0x43);
                printf("\n");
        }

        sc->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 143;

        /*
         * 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 = ahsc_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
ahsc_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
ahsc_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 (ahsc_dmadebug & DDB_IO)
                printf("ahsc_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
ahsc_dmastop(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;
        int s;
        vu_short istr;

        sdp = dev->sc_cregs;

#ifdef DEBUG
        if (ahsc_dmadebug & DDB_FOLLOW)
                printf("ahsc_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
ahsc_dmaintr(void *arg)
{
        struct sbic_softc *dev = arg;
        volatile struct sdmac *sdp;
        int stat, found;

        sdp = dev->sc_cregs;
        stat = sdp->ISTR;
        amiga_membarrier();

        if ((stat & (ISTR_INT_F|ISTR_INT_P)) == 0)
                return (0);

#ifdef DEBUG
        if (ahsc_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
ahsc_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("ahsc_dmanext at end !!!\n");
                ahsc_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
ahsc_dump(void)
{
        extern struct cfdriver ahsc_cd;
        struct sbic_softc *sc;
        int i;

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