/*      $NetBSD: uha_isa.c,v 1.42 2019/11/12 13:10:51 msaitoh Exp $     */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uha_isa.c,v 1.42 2019/11/12 13:10:51 msaitoh Exp $");

#include "opt_ddb.h"

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

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

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

#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>

#include <dev/ic/uhareg.h>
#include <dev/ic/uhavar.h>

#define UHA_ISA_IOSIZE  16

int     uha_isa_probe(device_t, cfdata_t, void *);
void    uha_isa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(uha_isa, sizeof(struct uha_softc),
    uha_isa_probe, uha_isa_attach, NULL, NULL);

#ifndef DDB
#define Debugger() panic("should call debugger here (uha_isa.c)")
#endif /* ! DDB */

int     u14_find(bus_space_tag_t, bus_space_handle_t, struct uha_probe_data *);
void    u14_start_mbox(struct uha_softc *, struct uha_mscp *);
int     u14_poll(struct uha_softc *, struct scsipi_xfer *, int);
int     u14_intr(void *);
void    u14_init(struct uha_softc *);

/*
 * Check the slots looking for a board we recognise
 * If we find one, note its address (slot) and call
 * the actual probe routine to check it out.
 */
int
uha_isa_probe(device_t parent, cfdata_t match, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_tag_t iot = ia->ia_iot;
        bus_space_handle_t ioh;
        struct uha_probe_data upd;
        int rv;

        if (ia->ia_nio < 1)
                return (0);
        if (ia->ia_nirq < 1)
                return (0);
        if (ia->ia_ndrq < 1)
                return (0);

        if (ISA_DIRECT_CONFIG(ia))
                return (0);

        /* Disallow wildcarded i/o address. */
        if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
                return (0);

        if (bus_space_map(iot, ia->ia_io[0].ir_addr, UHA_ISA_IOSIZE, 0, &ioh))
                return (0);

        rv = u14_find(iot, ioh, &upd);

        bus_space_unmap(iot, ioh, UHA_ISA_IOSIZE);

        if (rv) {
                if (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
                    ia->ia_irq[0].ir_irq != upd.sc_irq)
                        return (0);
                if (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ &&
                    ia->ia_drq[0].ir_drq != upd.sc_drq)
                        return (0);

                ia->ia_nio = 1;
                ia->ia_io[0].ir_size = UHA_ISA_IOSIZE;

                ia->ia_nirq = 1;
                ia->ia_irq[0].ir_irq = upd.sc_irq;

                ia->ia_ndrq = 1;
                ia->ia_drq[0].ir_drq = upd.sc_drq;

                ia->ia_niomem = 0;
        }
        return (rv);
}

/*
 * Attach all the sub-devices we can find
 */
void
uha_isa_attach(device_t parent, device_t self, void *aux)
{
        struct isa_attach_args *ia = aux;
        struct uha_softc *sc = device_private(self);
        bus_space_tag_t iot = ia->ia_iot;
        bus_dma_tag_t dmat = ia->ia_dmat;
        bus_space_handle_t ioh;
        struct uha_probe_data upd;
        isa_chipset_tag_t ic = ia->ia_ic;
        int error;

        sc->sc_dev = self;
        printf("\n");

        if (bus_space_map(iot, ia->ia_io[0].ir_addr, UHA_ISA_IOSIZE, 0, &ioh)) {
                aprint_error_dev(sc->sc_dev, "can't map i/o space\n");
                return;
        }

        sc->sc_iot = iot;
        sc->sc_ioh = ioh;
        sc->sc_dmat = dmat;
        if (!u14_find(iot, ioh, &upd)) {
                aprint_error_dev(sc->sc_dev, "u14_find failed\n");
                return;
        }

        if (upd.sc_drq != -1) {
                sc->sc_dmaflags = 0;
                if ((error = isa_dmacascade(ic, upd.sc_drq)) != 0) {
                        aprint_error_dev(sc->sc_dev, "unable to cascade DRQ, error = %d\n", error);
                        return;
                }
        } else {
                /*
                 * We have a VLB controller, and can do 32-bit DMA.
                 */
                sc->sc_dmaflags = ISABUS_DMA_32BIT;
        }

        sc->sc_ih = isa_intr_establish(ic, upd.sc_irq, IST_EDGE, IPL_BIO,
            u14_intr, sc);
        if (sc->sc_ih == NULL) {
                aprint_error_dev(sc->sc_dev, "couldn't establish interrupt\n");
                return;
        }

        /* Save function pointers for later use. */
        sc->start_mbox = u14_start_mbox;
        sc->poll = u14_poll;
        sc->init = u14_init;

        uha_attach(sc, &upd);
}

/*
 * Start the board, ready for normal operation
 */
int
u14_find(bus_space_tag_t iot, bus_space_handle_t ioh, struct uha_probe_data *sc)
{
        u_int16_t model, config;
        int irq, drq;
        int resetcount = 4000;  /* 4 secs? */

        model = (bus_space_read_1(iot, ioh, U14_ID + 0) << 8) |
                (bus_space_read_1(iot, ioh, U14_ID + 1) << 0);
        if ((model & 0xfff0) != 0x5640)
                return (0);

        config = (bus_space_read_1(iot, ioh, U14_CONFIG + 0) << 8) |
                 (bus_space_read_1(iot, ioh, U14_CONFIG + 1) << 0);

        switch (model & 0x000f) {
        case 0x0000:
                switch (config & U14_DMA_MASK) {
                case U14_DMA_CH5:
                        drq = 5;
                        break;
                case U14_DMA_CH6:
                        drq = 6;
                        break;
                case U14_DMA_CH7:
                        drq = 7;
                        break;
                default:
                        printf("u14_find: illegal drq setting %x\n",
                            config & U14_DMA_MASK);
                        return (0);
                }
                break;
        case 0x0001:
                /* This is a 34f, and doesn't need an ISA DMA channel. */
                drq = -1;
                break;
        default:
                printf("u14_find: unknown model %x\n", model);
                return (0);
        }

        switch (config & U14_IRQ_MASK) {
        case U14_IRQ10:
                irq = 10;
                break;
        case U14_IRQ11:
                irq = 11;
                break;
        case U14_IRQ14:
                irq = 14;
                break;
        case U14_IRQ15:
                irq = 15;
                break;
        default:
                printf("u14_find: illegal irq setting %x\n",
                    config & U14_IRQ_MASK);
                return (0);
        }

        bus_space_write_1(iot, ioh, U14_LINT, UHA_ASRST);

        while (--resetcount) {
                if (bus_space_read_1(iot, ioh, U14_LINT))
                        break;
                delay(1000);    /* 1 mSec per loop */
        }
        if (!resetcount) {
                printf("u14_find: board timed out during reset\n");
                return (0);
        }

        /* if we want to fill in softc, do so now */
        if (sc) {
                sc->sc_irq = irq;
                sc->sc_drq = drq;
                sc->sc_scsi_dev = config & U14_HOSTID_MASK;
        }

        return (1);
}

/*
 * Function to send a command out through a mailbox
 */
void
u14_start_mbox(struct uha_softc *sc, struct uha_mscp *mscp)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;
        int spincount = 100000; /* 1s should be enough */

        while (--spincount) {
                if ((bus_space_read_1(iot, ioh, U14_LINT) & U14_LDIP) == 0)
                        break;
                delay(100);
        }
        if (!spincount) {
                aprint_error_dev(sc->sc_dev, "uha_start_mbox, board not responding\n");
                Debugger();
        }

        bus_space_write_4(iot, ioh, U14_OGMPTR,
            sc->sc_dmamap_mscp->dm_segs[0].ds_addr + UHA_MSCP_OFF(mscp));
        if (mscp->flags & MSCP_ABORT)
                bus_space_write_1(iot, ioh, U14_LINT, U14_ABORT);
        else
                bus_space_write_1(iot, ioh, U14_LINT, U14_OGMFULL);

        if ((mscp->xs->xs_control & XS_CTL_POLL) == 0)
                callout_reset(&mscp->xs->xs_callout,
                    mstohz(mscp->timeout), uha_timeout, mscp);
}

/*
 * Function to poll for command completion when in poll mode.
 *
 *      wait = timeout in msec
 */
int
u14_poll(struct uha_softc *sc, struct scsipi_xfer *xs, int count)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;

        while (count) {
                /*
                 * If we had interrupts enabled, would we
                 * have got an interrupt?
                 */
                if (bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP)
                        u14_intr(sc);
                if (xs->xs_status & XS_STS_DONE)
                        return (0);
                delay(1000);
                count--;
        }
        return (1);
}

/*
 * Catch an interrupt from the adaptor
 */
int
u14_intr(void *arg)
{
        struct uha_softc *sc = arg;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;
        struct uha_mscp *mscp;
        u_char uhastat;
        u_long mboxval;

#ifdef  UHADEBUG
        printf("%s: uhaintr ", device_xname(sc->sc_dev));
#endif /*UHADEBUG */

        if ((bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP) == 0)
                return (0);

        for (;;) {
                /*
                 * First get all the information and then
                 * acknowledge the interrupt
                 */
                uhastat = bus_space_read_1(iot, ioh, U14_SINT);
                mboxval = bus_space_read_4(iot, ioh, U14_ICMPTR);
                /* XXX Send an ABORT_ACK instead? */
                bus_space_write_1(iot, ioh, U14_SINT, U14_ICM_ACK);

#ifdef  UHADEBUG
                printf("status = 0x%x ", uhastat);
#else
                __USE(uhastat);
#endif /*UHADEBUG*/

                /*
                 * Process the completed operation
                 */
                mscp = uha_mscp_phys_kv(sc, mboxval);
                if (!mscp) {
                        printf("%s: BAD MSCP RETURNED!\n",
                            device_xname(sc->sc_dev));
                        continue;       /* whatever it was, it'll timeout */
                }

                callout_stop(&mscp->xs->xs_callout);
                uha_done(sc, mscp);

                if ((bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP) == 0)
                        return (1);
        }
}

void
u14_init(struct uha_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;

        /* make sure interrupts are enabled */
#ifdef UHADEBUG
        printf("u14_init: lmask=%02x, smask=%02x\n",
            bus_space_read_1(iot, ioh, U14_LMASK),
            bus_space_read_1(iot, ioh, U14_SMASK));
#endif
        bus_space_write_1(iot, ioh, U14_LMASK, 0xd1);   /* XXX */
        bus_space_write_1(iot, ioh, U14_SMASK, 0x91);   /* XXX */
}