/*      $OpenBSD: siop_gsc.c,v 1.6 2024/05/22 14:25:47 jsg Exp $        */

/*
 * Copyright (c) 2007 Mark Kettenis
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/iomod.h>

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

#include <dev/ic/siopreg.h>
#include <dev/ic/siopvar_common.h>
#include <dev/ic/siopvar.h>

#include <hppa/dev/cpudevs.h>
#include <hppa/gsc/gscbusvar.h>

#define SIOP_GSC_RESET  0x0000
#define SIOP_GSC_OFFSET 0x0100

int siop_gsc_match(struct device *, void *, void *);
void siop_gsc_attach(struct device *, struct device *, void *);
void siop_gsc_reset(struct siop_common_softc *);

u_int8_t siop_gsc_r1(void *, bus_space_handle_t, bus_size_t);
u_int16_t siop_gsc_r2(void *, bus_space_handle_t, bus_size_t);
void siop_gsc_w1(void *, bus_space_handle_t, bus_size_t, u_int8_t);
void siop_gsc_w2(void *, bus_space_handle_t, bus_size_t, u_int16_t);

struct siop_gsc_softc {
        struct siop_softc sc_siop;
        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_ioh;
        struct hppa_bus_space_tag sc_bustag;
};

const struct cfattach siop_gsc_ca = {
        sizeof(struct siop_gsc_softc), siop_gsc_match, siop_gsc_attach
};

int
siop_gsc_match(struct device *parent, void *match, void *aux)
{
        struct gsc_attach_args *ga = aux;

        if (ga->ga_type.iodc_type != HPPA_TYPE_FIO ||
            ga->ga_type.iodc_sv_model != HPPA_FIO_FWSCSI)
                return 0;

        return 1;
}

void
siop_gsc_attach(struct device *parent, struct device *self, void *aux)
{
        struct siop_gsc_softc *sc = (struct siop_gsc_softc *)self;
        struct gsc_attach_args *ga = aux;

        sc->sc_iot = ga->ga_iot;
        if (bus_space_map(sc->sc_iot, ga->ga_hpa,
            IOMOD_HPASIZE, 0, &sc->sc_ioh)) {
                printf(": cannot map io space\n");
                return;
        }

        sc->sc_bustag = *sc->sc_iot;
        sc->sc_bustag.hbt_r1 = siop_gsc_r1;
        sc->sc_bustag.hbt_r2 = siop_gsc_r2;
        sc->sc_bustag.hbt_w1 = siop_gsc_w1;
        sc->sc_bustag.hbt_w2 = siop_gsc_w2;

        sc->sc_siop.sc_c.features = SF_CHIP_PF | SF_CHIP_BE | SF_BUS_WIDE;
        sc->sc_siop.sc_c.maxburst = 4;
        sc->sc_siop.sc_c.maxoff = 8;
        sc->sc_siop.sc_c.clock_div = 3;
        sc->sc_siop.sc_c.clock_period = 250;
        sc->sc_siop.sc_c.ram_size = 0;

        sc->sc_siop.sc_c.sc_reset = siop_gsc_reset;
        sc->sc_siop.sc_c.sc_dmat = ga->ga_dmatag;

        sc->sc_siop.sc_c.sc_rt = &sc->sc_bustag;
        bus_space_subregion(sc->sc_iot, sc->sc_ioh, SIOP_GSC_OFFSET,
            IOMOD_HPASIZE - SIOP_GSC_OFFSET, &sc->sc_siop.sc_c.sc_rh);

        /*
         * Reset the SCSI subsystem.
         */
        bus_space_write_1(sc->sc_iot, sc->sc_ioh, SIOP_GSC_RESET, 0);
        DELAY(1000);
        siop_gsc_reset(&sc->sc_siop.sc_c);

        gsc_intr_establish((struct gsc_softc *)parent, ga->ga_irq,
            IPL_BIO, siop_intr, sc, sc->sc_siop.sc_c.sc_dev.dv_xname);

        printf(": NCR53C720 rev %d\n", bus_space_read_1(sc->sc_siop.sc_c.sc_rt,
            sc->sc_siop.sc_c.sc_rh, SIOP_CTEST3) >> 4);

        siop_attach(&sc->sc_siop);
}

void
siop_gsc_reset(struct siop_common_softc *sc)
{
        bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_DCNTL, DCNTL_EA);
        bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_CTEST0, CTEST0_EHP);
        bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_CTEST4, CTEST4_MUX);

        bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_STIME0,
            (0xc << STIME0_SEL_SHIFT));
}

u_int8_t
siop_gsc_r1(void *v, bus_space_handle_t h, bus_size_t o)
{
        return *(volatile u_int8_t *)(h + (o ^ 3));
}

u_int16_t
siop_gsc_r2(void *v, bus_space_handle_t h, bus_size_t o)
{
        if (o == SIOP_SIST0) {
                u_int16_t reg;

                reg = siop_gsc_r1(v, h, SIOP_SIST0);
                reg |= siop_gsc_r1(v, h, SIOP_SIST1) << 8;
                return reg;
        }
        return *(volatile u_int16_t *)(h + (o ^ 2));
}

void
siop_gsc_w1(void *v, bus_space_handle_t h, bus_size_t o, u_int8_t vv)
{
        *(volatile u_int8_t *)(h + (o ^ 3)) = vv;
}

void
siop_gsc_w2(void *v, bus_space_handle_t h, bus_size_t o, u_int16_t vv)
{
        *(volatile u_int16_t *)(h + (o ^ 2)) = vv;
}