/*      $NetBSD: asc.c,v 1.22 2021/08/07 16:18:40 thorpej Exp $ */

/*
 * Copyright (c) 2001 Richard Earnshaw
 * All rights reserved.
 *
 * 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. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * 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.
 *
 * Copyright (c) 1996 Mark Brinicombe
 *
 * 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.
 *
 *      from:ahsc.c
 */

/*
 * Driver for the Acorn SCSI card using the SBIC (WD33C93A) generic driver
 *
 * Thanks to Acorn for supplying programming information on this card.
 */

/* #define ASC_DMAMAP_DEBUG */
/* #define DEBUG */

#include "opt_ddb.h"

#include <sys/param.h>

__KERNEL_RCSID(0, "$NetBSD: asc.c,v 1.22 2021/08/07 16:18:40 thorpej Exp $");

#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/bus.h>

#include <uvm/uvm_extern.h>

#include <machine/intr.h>
#include <machine/bootconfig.h>         /* asc_poll */

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <dev/podulebus/podules.h>
#include <dev/podulebus/powerromreg.h>

#include <acorn32/podulebus/podulebus.h>
#include <acorn32/podulebus/sbicreg.h>
#include <acorn32/podulebus/sbicvar.h>
#include <acorn32/podulebus/ascreg.h>
#include <acorn32/podulebus/ascvar.h>

void ascattach          (device_t, device_t, void *);
int  ascmatch           (device_t, cfdata_t, void *);

void asc_enintr         (struct sbic_softc *);

int  asc_dmaok          (void *, bus_dma_tag_t, struct sbic_acb *);
int  asc_dmasetup       (void *, bus_dma_tag_t, struct sbic_acb *, int);
int  asc_dmanext        (void *, bus_dma_tag_t, struct sbic_acb *, int);
void asc_dmastop        (void *, bus_dma_tag_t, struct sbic_acb *);
void asc_dmafinish      (void *, bus_dma_tag_t, struct sbic_acb *);

int  asc_intr           (void *);
void asc_minphys        (struct buf *);

void asc_dump           (void);

#ifdef DEBUG
int     asc_dmadebug = 0;
#endif

CFATTACH_DECL_NEW(asc, sizeof(struct asc_softc),
    ascmatch, ascattach, NULL, NULL);

extern struct cfdriver asc_cd;

u_long scsi_nosync;
int shift_nosync;

#if ASC_POLL > 0
int asc_poll = 0;

#endif

int
ascmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct podule_attach_args *pa = aux;

        /* Look for the card */

        /* Standard ROM, skipping the MCS card that used the same ID. */
        if (pa->pa_product == PODULE_ACORN_SCSI &&
            strncmp(pa->pa_podule->description, "MCS", 3) != 0)
                return 1;

        /* PowerROM */
        if (pa->pa_product == PODULE_ALSYSTEMS_SCSI &&
            podulebus_initloader(pa) == 0 &&
            podloader_callloader(pa, 0, 0) == PRID_ACORN_SCSI1)
                return 1;

        return 0;
}

void
ascattach(device_t parent, device_t self, void *aux)
{
        /* volatile struct sdmac *rp;*/
        struct asc_softc *sc;
        struct sbic_softc *sbic;
        struct podule_attach_args *pa;

        sc = device_private(self);
        pa = aux;

        if (pa->pa_podule_number == -1)
                panic("Podule has disappeared !");

        sc->sc_podule_number = pa->pa_podule_number;
        sc->sc_podule = pa->pa_podule;
        podules[sc->sc_podule_number].attached = 1;

        sbic = &sc->sc_softc;

        sbic->sc_dev = self;
        sbic->sc_enintr = asc_enintr;
        sbic->sc_dmaok = asc_dmaok;
        sbic->sc_dmasetup = asc_dmasetup;
        sbic->sc_dmanext = asc_dmanext;
        sbic->sc_dmastop = asc_dmastop;
        sbic->sc_dmafinish = asc_dmafinish;

        /* Map sbic */
        sbic->sc_sbicp.sc_sbiciot = pa->pa_iot;
        if (bus_space_map (sbic->sc_sbicp.sc_sbiciot,
            sc->sc_podule->mod_base + ASC_SBIC, ASC_SBIC_SPACE, 0,
            &sbic->sc_sbicp.sc_sbicioh))
                panic("%s: Cannot map SBIC", device_xname(self));

        sbic->sc_clkfreq = sbic_clock_override ? sbic_clock_override : 143;

        sbic->sc_adapter.adapt_dev = self;
        sbic->sc_adapter.adapt_nchannels = 1;
        sbic->sc_adapter.adapt_openings = 7; 
        sbic->sc_adapter.adapt_max_periph = 1;
        sbic->sc_adapter.adapt_ioctl = NULL; 
        sbic->sc_adapter.adapt_minphys = asc_minphys;
        sbic->sc_adapter.adapt_request = sbic_scsi_request;

        sbic->sc_channel.chan_adapter = &sbic->sc_adapter;
        sbic->sc_channel.chan_bustype = &scsi_bustype;
        sbic->sc_channel.chan_channel = 0;
        sbic->sc_channel.chan_ntargets = 8;
        sbic->sc_channel.chan_nluns = 8;
        sbic->sc_channel.chan_id = 7;

        /* Provide an override for the host id */
        (void)get_bootconf_option(boot_args, "asc.hostid",
            BOOTOPT_TYPE_INT, &sbic->sc_channel.chan_id);

        printf(": hostid=%d", sbic->sc_channel.chan_id);

#if ASC_POLL > 0
        if (boot_args)
                get_bootconf_option(boot_args, "ascpoll", BOOTOPT_TYPE_BOOLEAN,
                    &asc_poll);

        if (asc_poll) {
                sbic->sc_adapter.adapt_flags |= SCSIPI_ADAPT_POLL_ONLY;
                printf(" polling");
        }
#endif
        printf("\n");

        sc->sc_pagereg = sc->sc_podule->fast_base + ASC_PAGEREG;
        sc->sc_intstat = sc->sc_podule->fast_base + ASC_INTSTATUS;

        /* Reset the card */

        WriteByte(sc->sc_pagereg, 0x80);
        DELAY(500000);
        WriteByte(sc->sc_pagereg, 0x00);
        DELAY(250000);

        sbicinit(sbic);

        /* If we are polling only, we don't need a interrupt handler.  */

#ifdef ASC_POLL
        if (!asc_poll)
#endif
        {
                evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL,
                    device_xname(self), "intr");
                sc->sc_ih = podulebus_irq_establish(pa->pa_ih, IPL_BIO,
                    asc_intr, sc, &sc->sc_intrcnt);
                if (sc->sc_ih == NULL)
                        panic("%s: Cannot claim podule IRQ", device_xname(self));
        }

        /*
         * attach all scsi units on us
         */
        config_found(self, &sbic->sc_channel, scsiprint, CFARGS_NONE);
}


void
asc_enintr(struct sbic_softc *sbicsc)
{
        struct asc_softc *sc = (struct asc_softc *)sbicsc;

        sbicsc->sc_flags |= SBICF_INTR;
        WriteByte(sc->sc_pagereg, 0x40);
}

int
asc_dmaok (void *dma_h, bus_dma_tag_t dma_t, struct sbic_acb *acb)
{
        return 0;
}

int
asc_dmasetup (void *dma_h, bus_dma_tag_t dma_t, struct sbic_acb *acb, int dir)
{
        printf("asc_dmasetup()");
#ifdef DDB
        Debugger();
#else
        panic("Hit a brick wall");
#endif
        return 0;
}

int
asc_dmanext (void *dma_h, bus_dma_tag_t dma_t, struct sbic_acb *acb, int dir)
{
        printf("asc_dmanext()");
#ifdef DDB
        Debugger();
#else
        panic("Hit a brick wall");
#endif
        return 0;
}

void
asc_dmastop (void *dma_h, bus_dma_tag_t dma_t, struct sbic_acb *acb)
{
        printf("asc_dmastop\n");
}

void
asc_dmafinish (void *dma_h, bus_dma_tag_t dma_t, struct sbic_acb *acb)
{
        printf("asc_dmafinish\n");
}

void
asc_dump(void)
{
        int i;
        struct asc_softc *sc;

        for (i = 0; i < asc_cd.cd_ndevs; ++i) {
                sc = device_lookup_private(&asc_cd, i);
                if (sc != NULL)
                        sbic_dump(&sc->sc_softc);
        }
}

int
asc_intr(void *arg)
{
        struct asc_softc *sc = arg;
        int intr;
        
        /* printf("ascintr:");*/
        intr = ReadByte(sc->sc_intstat);
        /* printf("%02x\n", intr);*/

        if (intr & IS_SBIC_IRQ)
                sbicintr((struct sbic_softc *)sc);

        return 0;       /* Pass interrupt on down the chain */
}

/*
 * limit the transfer as required.
 */
void
asc_minphys(struct buf *bp)
{
#if 0
        /*
         * We must limit the DMA xfer size
         */
        if (bp->b_bcount > MAX_DMA_LEN) {
                printf("asc: Reducing DMA length\n");
                bp->b_bcount = MAX_DMA_LEN;
        }
#endif
        minphys(bp);
}