/*      $OpenBSD: cac_eisa.c,v 1.7 2022/04/06 18:59:28 naddy Exp $      */
/*      $NetBSD: cac_eisa.c,v 1.1 2000/09/01 12:15:20 ad Exp $  */

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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) 2000 Jonathan Lemon
 * Copyright (c) 1999 by Matthew N. Dodd <winter@jurai.net>
 * 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,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 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
 * SUCH DAMAGE.
 */

/*
 * EISA front-end for cac(4) driver.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <machine/bus.h>
#include <machine/intr.h>

#include <dev/eisa/eisavar.h>
#include <dev/eisa/eisadevs.h>

#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>

#include <dev/ic/cacreg.h>
#include <dev/ic/cacvar.h>

#define CAC_EISA_SLOT_OFFSET            0x0c88
#define CAC_EISA_IOSIZE                 0x0017
#define CAC_EISA_IOCONF                 0x38

int     cac_eisa_match(struct device *, void *, void *);
void    cac_eisa_attach(struct device *, struct device *, void *);

struct  cac_ccb *cac_eisa_l0_completed(struct cac_softc *);
int     cac_eisa_l0_fifo_full(struct cac_softc *);
void    cac_eisa_l0_intr_enable(struct cac_softc *, int);
int     cac_eisa_l0_intr_pending(struct cac_softc *);
void    cac_eisa_l0_submit(struct cac_softc *, struct cac_ccb *);

const struct cfattach cac_eisa_ca = {
        sizeof(struct cac_softc), cac_eisa_match, cac_eisa_attach
};

static const
struct cac_linkage cac_eisa_l0 = {
        cac_eisa_l0_completed,
        cac_eisa_l0_fifo_full,
        cac_eisa_l0_intr_enable,
        cac_eisa_l0_intr_pending,
        cac_eisa_l0_submit
};

static const
struct cac_eisa_type {
        const char      *ct_prodstr;
        const char      *ct_typestr;
        const struct    cac_linkage *ct_linkage;
} cac_eisa_type[] = {
        { "CPQ4001",    "IDA",          &cac_eisa_l0 },
        { "CPQ4002",    "IDA-2",        &cac_eisa_l0 },
        { "CPQ4010",    "IEAS",         &cac_eisa_l0 },
        { "CPQ4020",    "SMART",        &cac_eisa_l0 },
        { "CPQ4030",    "SMART-2/E",    &cac_l0 },
};

int
cac_eisa_match(struct device *parent, void *match, void *aux)
{
        struct eisa_attach_args *ea;
        int i;

        ea = aux;

        for (i = 0; i < sizeof(cac_eisa_type) / sizeof(cac_eisa_type[0]); i++)
                if (strcmp(ea->ea_idstring, cac_eisa_type[i].ct_prodstr) == 0)
                        return (1);

        return (0);
}

void
cac_eisa_attach(struct device *parent, struct device *self, void *aux)
{
        struct eisa_attach_args *ea;
        bus_space_handle_t ioh;
        eisa_chipset_tag_t ec;
        eisa_intr_handle_t ih;
        struct cac_softc *sc;
        bus_space_tag_t iot;
        const char *intrstr;
        int irq, i;
        
        ea = aux;
        sc = (struct cac_softc *)self;
        iot = ea->ea_iot;
        ec = ea->ea_ec;
        
        if (bus_space_map(iot, EISA_SLOT_ADDR(ea->ea_slot) +
            CAC_EISA_SLOT_OFFSET, CAC_EISA_IOSIZE, 0, &ioh)) {
                printf(": can't map i/o space\n");
                return;
        }

        /*
         * Print board type and attach to the bus-independent code.
         */
        for (i = 0; i < nitems(cac_eisa_type); i++)
                if (strcmp(ea->ea_idstring, cac_eisa_type[i].ct_prodstr) == 0)
                        break;

        if (i == nitems(cac_eisa_type)) {
                printf(": failed to attach %s\n", ea->ea_idstring);
                return;
        }

        sc->sc_iot = iot;
        sc->sc_ioh = ioh;
        sc->sc_dmat = ea->ea_dmat;

        /* 
         * Map and establish the interrupt.
         */
        switch (bus_space_read_1(iot, ioh, CAC_EISA_IOCONF) & 0xf0) {
        case 0x20:
                irq = 10;
                break;
        case 0x10:
                irq = 11;
                break;
        case 0x40:
                irq = 14;
                break;
        case 0x80:
                irq = 15;
                break;
        default:
                printf(": controller on invalid IRQ\n");
                return;
        }

        if (eisa_intr_map(ec, irq, &ih)) {
                printf(": can't map interrupt (%d)\n", irq);
                return;
        }
        
        intrstr = eisa_intr_string(ec, ih);
        if ((sc->sc_ih = eisa_intr_establish(ec, ih, IST_LEVEL, IPL_BIO,
            cac_intr, sc, sc->sc_dv.dv_xname)) == NULL) {
                printf(": can't establish interrupt");
                if (intrstr != NULL)
                        printf(" at %s", intrstr);
                printf("\n");
                return;
        }

        printf(" %s: Compaq %s\n", intrstr, cac_eisa_type[i].ct_typestr);
        sc->sc_cl = cac_eisa_type[i].ct_linkage;
        cac_init(sc, 0);
}

/*
 * Linkage specific to EISA boards.
 */

int
cac_eisa_l0_fifo_full(struct cac_softc *sc)
{

        return ((cac_inb(sc, CAC_EISAREG_SYSTEM_DOORBELL) &
            CAC_EISA_CHANNEL_CLEAR) == 0);
}

void
cac_eisa_l0_submit(struct cac_softc *sc, struct cac_ccb *ccb)
{
        u_int16_t size;

        /*
         * On these boards, `ccb_hdr.size' is actually for control flags.
         * Set it to zero and pass the value by means of an I/O port.
         */
        size = letoh16(ccb->ccb_hdr.size) << 2;
        ccb->ccb_hdr.size = 0;

        bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, (caddr_t)ccb - sc->sc_ccbs,
            sizeof(struct cac_ccb), BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD);

        cac_outb(sc, CAC_EISAREG_SYSTEM_DOORBELL, CAC_EISA_CHANNEL_CLEAR);
        cac_outl(sc, CAC_EISAREG_LIST_ADDR, ccb->ccb_paddr);
        cac_outw(sc, CAC_EISAREG_LIST_LEN, size);
        cac_outb(sc, CAC_EISAREG_LOCAL_DOORBELL, CAC_EISA_CHANNEL_BUSY);
}

struct cac_ccb *
cac_eisa_l0_completed(struct cac_softc *sc)
{
        struct cac_ccb *ccb;
        u_int32_t off;
        u_int8_t status;

        if ((cac_inb(sc, CAC_EISAREG_SYSTEM_DOORBELL) &
            CAC_EISA_CHANNEL_BUSY) == 0)
                return (NULL);

        cac_outb(sc, CAC_EISAREG_SYSTEM_DOORBELL, CAC_EISA_CHANNEL_BUSY);
        off = cac_inl(sc, CAC_EISAREG_COMPLETE_ADDR);
        status = cac_inb(sc, CAC_EISAREG_LIST_STATUS);
        cac_outb(sc, CAC_EISAREG_LOCAL_DOORBELL, CAC_EISA_CHANNEL_CLEAR);

        if (off == 0)
                return (NULL);

        off = (off & ~3) - sc->sc_ccbs_paddr;
        ccb = (struct cac_ccb *)(sc->sc_ccbs + off);

        bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, off, sizeof(struct cac_ccb),
            BUS_DMASYNC_POSTWRITE | BUS_DMASYNC_POSTREAD);

        ccb->ccb_req.error = status;
        return (ccb);
}

int
cac_eisa_l0_intr_pending(struct cac_softc *sc)
{

        return (cac_inb(sc, CAC_EISAREG_SYSTEM_DOORBELL) &
            CAC_EISA_CHANNEL_BUSY);
}

void
cac_eisa_l0_intr_enable(struct cac_softc *sc, int state)
{

        if (state) {
                cac_outb(sc, CAC_EISAREG_SYSTEM_DOORBELL,
                    ~CAC_EISA_CHANNEL_CLEAR);
                cac_outb(sc, CAC_EISAREG_LOCAL_DOORBELL,
                    CAC_EISA_CHANNEL_BUSY);
                cac_outb(sc, CAC_EISAREG_INTR_MASK, CAC_INTR_ENABLE);
                cac_outb(sc, CAC_EISAREG_SYSTEM_MASK, CAC_INTR_ENABLE);
        } else
                cac_outb(sc, CAC_EISAREG_SYSTEM_MASK, CAC_INTR_DISABLE);
}