/*      $NetBSD: gtsc.c,v 1.43 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: gtsc.c,v 1.43 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/gtscreg.h>
#include <amiga/dev/zbusvar.h>
#include <amiga/dev/gvpbusvar.h>

void gtscattach(device_t, device_t, void *);
int gtscmatch(device_t, cfdata_t, void *);

void gtsc_enintr(struct sbic_softc *);
void gtsc_dmastop(struct sbic_softc *);
int gtsc_dmanext(struct sbic_softc *);
int gtsc_dmaintr(void *);
int gtsc_dmago(struct sbic_softc *, char *, int, int);

#ifdef DEBUG
void gtsc_dump(void);
#endif

int gtsc_maxdma = 0;    /* Maximum size per DMA transfer */
int gtsc_dmamask = 0;
int gtsc_dmabounce = 0;
int gtsc_clock_override = 0;

#ifdef DEBUG
int gtsc_debug = 0;
#endif

CFATTACH_DECL_NEW(gtsc, sizeof(struct sbic_softc),
    gtscmatch, gtscattach, NULL, NULL);

int
gtscmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct gvpbus_args *gap;

        gap = aux;
        if (gap->flags & GVP_SCSI)
                return(1);
        return(0);
}

/*
 * attach all devices on our board.
 */
void
gtscattach(device_t parent, device_t self, void *aux)
{
        volatile struct sdmac *rp;
        struct gvpbus_args *gap;
        struct sbic_softc *sc = device_private(self);
        struct scsipi_adapter *adapt = &sc->sc_adapter;
        struct scsipi_channel *chan = &sc->sc_channel;

        gap = aux;
        sc->sc_dev = self;
        sc->sc_cregs = rp = gap->zargs.va;

        /*
         * disable ints and reset bank register
         */
        rp->CNTR = 0;
        amiga_membarrier();
        if ((gap->flags & GVP_NOBANK) == 0) {
                rp->bank = 0;
                amiga_membarrier();
        }

        sc->sc_dmago =  gtsc_dmago;
        sc->sc_enintr = gtsc_enintr;
        sc->sc_dmanext = gtsc_dmanext;
        sc->sc_dmastop = gtsc_dmastop;
        sc->sc_dmacmd = 0;

        sc->sc_flags |= SBICF_BADDMA;
        if (gtsc_dmamask)
                sc->sc_dmamask = gtsc_dmamask;
        else if (gap->flags & GVP_24BITDMA)
                sc->sc_dmamask = ~0x00ffffff;
        else if (gap->flags & GVP_25BITDMA)
                sc->sc_dmamask = ~0x01ffffff;
        else
                sc->sc_dmamask = ~0x07ffffff;
        printf(": dmamask 0x%lx", ~sc->sc_dmamask);

        if ((gap->flags & GVP_NOBANK) == 0)
                sc->gtsc_bankmask = (~sc->sc_dmamask >> 18) & 0x01c0;

#if 0
        /*
         * if the user requests a bounce buffer or
         * the users kva space is not ztwo and DMA needs it
         * try and allocate a bounce buffer.  If we allocate
         * one and it is in ztwo space leave maxdma to user
         * setting or default to MAXPHYS else the address must
         * be on the chip bus so decrease it to either the users
         * setting or 1024 bytes.
         *
         * XXX this needs to change if we move to multiple memory segments.
         */
        if (gtsc_dmabounce || 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 (gtsc_maxdma == 0) {
                        gtsc_maxdma = 1024;
                        printf(" bounce pa 0x%x",
                            PREP_DMA_MEM(sc->sc_dmabuffer));
                }
        }
#endif
        if (gtsc_maxdma == 0)
                gtsc_maxdma = MAXPHYS;

        printf(" flags %x", gap->flags);
        printf(" maxdma %d\n", gtsc_maxdma);

        sc->sc_sbic.sbic_asr_p = (volatile unsigned char *)rp + 0x61;
        sc->sc_sbic.sbic_value_p = (volatile unsigned char *)rp + 0x63;
        amiga_membarrier();

        sc->sc_clkfreq = gtsc_clock_override ? gtsc_clock_override :
            ((gap->flags & GVP_14MHZ) ? 143 : 72);
        printf("sc_clkfreg: %ld.%ld MHz\n", sc->sc_clkfreq / 10, sc->sc_clkfreq % 10);

        /*
         * 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 = gtsc_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
gtsc_enintr(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;

        sdp = dev->sc_cregs;

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

int
gtsc_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 = GVP_CNTR_INTEN;
        if ((flags & DMAGO_READ) == 0)
                dev->sc_dmacmd |= GVP_CNTR_DDIR;

#ifdef DEBUG
        if (gtsc_debug & DDB_IO)
                printf("gtsc_dmago: cmd %x\n", dev->sc_dmacmd);
#endif
        dev->sc_flags |= SBICF_INTR;
        sdp->CNTR = dev->sc_dmacmd;
        amiga_membarrier();
        if((u_int)dev->sc_cur->dc_addr & dev->sc_dmamask) {
#if 1
                printf("gtsc_dmago: pa %p->%lx dmacmd %x",
                    dev->sc_cur->dc_addr,
                    (u_int)dev->sc_cur->dc_addr & ~dev->sc_dmamask,
                     dev->sc_dmacmd);
#endif
                sdp->ACR = 0x00f80000;  /***********************************/
        } else
                sdp->ACR = (u_int) dev->sc_cur->dc_addr;
        amiga_membarrier();
        if (dev->gtsc_bankmask) {
                sdp->bank =
                    dev->gtsc_bankmask & (((u_int)dev->sc_cur->dc_addr) >> 18);
                amiga_membarrier();
        }
        sdp->ST_DMA = 1;
        amiga_membarrier();

        /*
         * restrict transfer count to maximum
         */
        if (dev->sc_tcnt > gtsc_maxdma)
                dev->sc_tcnt = gtsc_maxdma;
#if 1
        if((u_int)dev->sc_cur->dc_addr & dev->sc_dmamask)
                printf(" tcnt %ld\n", dev->sc_tcnt);
#endif
        return(dev->sc_tcnt);
}

void
gtsc_dmastop(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;
        int s;

        sdp = dev->sc_cregs;

#ifdef DEBUG
        if (gtsc_debug & DDB_FOLLOW)
                printf("gtsc_dmastop()\n");
#endif
        if (dev->sc_dmacmd) {
                /*
                 * clear possible interrupt and stop DMA
                 */
                s = splbio();
                sdp->CNTR &= ~GVP_CNTR_INT_P;
                amiga_membarrier();
                sdp->SP_DMA = 1;
                amiga_membarrier();
                dev->sc_dmacmd = 0;
                splx(s);
        }
}

int
gtsc_dmaintr(void *arg)
{
        struct sbic_softc *dev = arg;
        volatile struct sdmac *sdp;
        int stat;

        sdp = dev->sc_cregs;
        stat = sdp->CNTR;
        amiga_membarrier();
        if ((stat & GVP_CNTR_INT_P) == 0)
                return (0);
#ifdef DEBUG
        if (gtsc_debug & DDB_FOLLOW)
                printf("%s: dmaintr 0x%x\n", device_xname(dev->sc_dev), stat);
#endif
        if (dev->sc_flags & SBICF_INTR)
                if (sbicintr(dev))
                        return (1);
        return(0);
}


int
gtsc_dmanext(struct sbic_softc *dev)
{
        volatile struct sdmac *sdp;

        sdp = dev->sc_cregs;

        if (dev->sc_cur > dev->sc_last) {
                /* shouldn't happen !! */
                printf("gtsc_dmanext at end !!!\n");
                gtsc_dmastop(dev);
                return(0);
        }
        /*
         * clear possible interrupt and stop DMA
         */
        sdp->CNTR &= ~GVP_CNTR_INT_P;
        amiga_membarrier();
        sdp->SP_DMA = 1;
        amiga_membarrier();

        sdp->CNTR = dev->sc_dmacmd;
        amiga_membarrier();
        sdp->ACR = (u_int) dev->sc_cur->dc_addr;
        amiga_membarrier();
        if (dev->gtsc_bankmask) {
                sdp->bank =
                    dev->gtsc_bankmask & ((u_int)dev->sc_cur->dc_addr >> 18);
                amiga_membarrier();
        }
        sdp->ST_DMA = 1;
        amiga_membarrier();

        dev->sc_tcnt = dev->sc_cur->dc_count << 1;
        if (dev->sc_tcnt > gtsc_maxdma)
                dev->sc_tcnt = gtsc_maxdma;
#ifdef DEBUG
        if (gtsc_debug & DDB_FOLLOW)
                printf("gtsc_dmanext ret: %ld\n", dev->sc_tcnt);
#endif
        return(dev->sc_tcnt);
}

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

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