/* $NetBSD: ioasic.c,v 1.49 2021/05/07 16:58:34 thorpej Exp $ */

/*-
 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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) 1994, 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Keith Bostic, Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include "opt_dec_3000_300.h"

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: ioasic.c,v 1.49 2021/05/07 16:58:34 thorpej Exp $");

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

#include <machine/autoconf.h>
#include <sys/bus.h>
#include <machine/pte.h>
#include <machine/rpb.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicreg.h>
#include <dev/tc/ioasicvar.h>

/* Definition of the driver for autoconfig. */
static int      ioasicmatch(device_t, cfdata_t, void *);
static void     ioasicattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ioasic, sizeof(struct ioasic_softc),
    ioasicmatch, ioasicattach, NULL, NULL);

static int      ioasic_intr(void *);
static int      ioasic_intrnull(void *);

#define C(x)    ((void *)(x))

#define IOASIC_DEV_LANCE        0
#define IOASIC_DEV_SCC0         1
#define IOASIC_DEV_SCC1         2
#define IOASIC_DEV_ISDN         3

#define IOASIC_DEV_BOGUS        -1

#define IOASIC_NCOOKIES         4

static const struct ioasic_dev ioasic_devs[] = {
        { "PMAD-BA ", IOASIC_SLOT_3_START, C(IOASIC_DEV_LANCE),
          IOASIC_INTR_LANCE, },
        { "z8530   ", IOASIC_SLOT_4_START, C(IOASIC_DEV_SCC0),
          IOASIC_INTR_SCC_0, },
        { "z8530   ", IOASIC_SLOT_6_START, C(IOASIC_DEV_SCC1),
          IOASIC_INTR_SCC_1, },
        { "TOY_RTC ", IOASIC_SLOT_8_START, C(IOASIC_DEV_BOGUS),
          0, },
        { "AMD79c30", IOASIC_SLOT_9_START, C(IOASIC_DEV_ISDN),
          IOASIC_INTR_ISDN_TXLOAD | IOASIC_INTR_ISDN_RXLOAD,  },
};
static const int ioasic_ndevs = __arraycount(ioasic_devs);

static struct ioasicintr {
        int     (*iai_func)(void *);
        void    *iai_arg;
        struct evcnt iai_evcnt;
} ioasicintrs[IOASIC_NCOOKIES];

tc_addr_t ioasic_base;          /* XXX XXX XXX */

/* There can be only one. */
static int ioasicfound;

static int
ioasicmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct tc_attach_args *ta = aux;

        /* Make sure that we're looking for this type of device. */
        if (strncmp("FLAMG-IO", ta->ta_modname, TC_ROM_LLEN))
                return (0);

        /* Check that it can actually exist. */
        if ((cputype != ST_DEC_3000_500) && (cputype != ST_DEC_3000_300))
                panic("ioasicmatch: how did we get here?");

        if (ioasicfound)
                return (0);

        return (1);
}

static void
ioasicattach(device_t parent, device_t self, void *aux)
{
        struct ioasic_softc *sc = device_private(self);
        struct tc_attach_args *ta = aux;
#ifdef DEC_3000_300
        u_long ssr;
#endif
        u_long i, imsk;
        const struct evcnt *pevcnt;
        char *cp;

        ioasicfound = 1;

        sc->sc_dev = self;
        sc->sc_bst = ta->ta_memt;
        if (bus_space_map(ta->ta_memt, ta->ta_addr,
                        0x400000, 0, &sc->sc_bsh)) {
                printf("%s: unable to map device\n", device_xname(self));
                return;
        }
        sc->sc_dmat = ta->ta_dmat;

        ioasic_base = sc->sc_base = ta->ta_addr; /* XXX XXX XXX */

#ifdef DEC_3000_300
        if (cputype == ST_DEC_3000_300) {
                ssr = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR);
                ssr |= IOASIC_CSR_FASTMODE;
                bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_CSR, ssr);
                printf(": slow mode\n");
        } else
#endif
                printf(": fast mode\n");

        /*
         * Turn off all device interrupt bits.
         * (This does _not_ include 3000/300 TC option slot bits.
         */
        imsk = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK);
        for (i = 0; i < ioasic_ndevs; i++)
                imsk &= ~ioasic_devs[i].iad_intrbits;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK, imsk);

        /*
         * Set up interrupt handlers.
         */
        pevcnt = tc_intr_evcnt(parent, ta->ta_cookie);
        for (i = 0; i < IOASIC_NCOOKIES; i++) {
                ioasicintrs[i].iai_func = ioasic_intrnull;
                ioasicintrs[i].iai_arg = (void *)i;

                cp = kmem_asprintf("slot %lu", i);
                evcnt_attach_dynamic(&ioasicintrs[i].iai_evcnt,
                    EVCNT_TYPE_INTR, pevcnt, device_xname(self), cp);
        }
        tc_intr_establish(parent, ta->ta_cookie, TC_IPL_NONE, ioasic_intr, sc);

        /*
         * Try to configure each device.
         */
        ioasic_attach_devs(sc, ioasic_devs, ioasic_ndevs);
}

void
ioasic_intr_establish(device_t ioa, void *cookie, tc_intrlevel_t level,
                int (*func)(void *), void *arg)
{
        struct ioasic_softc *sc = device_lookup_private(&ioasic_cd,0);
        u_long dev, i, imsk;

        dev = (u_long)cookie;
#ifdef DIAGNOSTIC
        /* XXX check cookie. */
#endif

        if (ioasicintrs[dev].iai_func != ioasic_intrnull)
                panic("ioasic_intr_establish: cookie %lu twice", dev);

        ioasicintrs[dev].iai_func = func;
        ioasicintrs[dev].iai_arg = arg;

        /* Enable interrupts for the device. */
        for (i = 0; i < ioasic_ndevs; i++)
                if (ioasic_devs[i].iad_cookie == cookie)
                        break;
        if (i == ioasic_ndevs)
                panic("ioasic_intr_establish: invalid cookie.");

        imsk = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK);
        imsk |= ioasic_devs[i].iad_intrbits;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK, imsk);
}

void
ioasic_intr_disestablish(device_t ioa, void *cookie)
{
        struct ioasic_softc *sc = device_lookup_private(&ioasic_cd,0);
        u_long dev, i, imsk;

        dev = (u_long)cookie;
#ifdef DIAGNOSTIC
        /* XXX check cookie. */
#endif

        if (ioasicintrs[dev].iai_func == ioasic_intrnull)
                panic("ioasic_intr_disestablish: cookie %lu missing intr", dev);

        /* Enable interrupts for the device. */
        for (i = 0; i < ioasic_ndevs; i++)
                if (ioasic_devs[i].iad_cookie == cookie)
                        break;
        if (i == ioasic_ndevs)
                panic("ioasic_intr_disestablish: invalid cookie.");

        imsk = bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK);
        imsk &= ~ioasic_devs[i].iad_intrbits;
        bus_space_write_4(sc->sc_bst, sc->sc_bsh, IOASIC_IMSK, imsk);

        ioasicintrs[dev].iai_func = ioasic_intrnull;
        ioasicintrs[dev].iai_arg = (void *)dev;
}

static int
ioasic_intrnull(void *val)
{

        panic("ioasic_intrnull: uncaught IOASIC intr for cookie %ld",
            (u_long)val);
}

/*
 * ASIC interrupt handler.
 */
static int
ioasic_intr(void *val)
{
        register struct ioasic_softc *sc = val;
        register int ifound;
        int gifound;
        uint32_t sir, osir;

        gifound = 0;
        do {
                ifound = 0;
                tc_syncbus();

                osir = sir =
                    bus_space_read_4(sc->sc_bst, sc->sc_bsh, IOASIC_INTR);

#define INCRINTRCNT(slot)       ioasicintrs[slot].iai_evcnt.ev_count++

                /* XXX DUPLICATION OF INTERRUPT BIT INFORMATION... */
#define CHECKINTR(slot, bits, clear)                                    \
                if (sir & (bits)) {                                     \
                        ifound = 1;                                     \
                        INCRINTRCNT(slot);                              \
                        (*ioasicintrs[slot].iai_func)                   \
                            (ioasicintrs[slot].iai_arg);                \
                        if (clear)                                      \
                                sir &= ~(bits);                         \
                }
                CHECKINTR(IOASIC_DEV_SCC0, IOASIC_INTR_SCC_0, 0);
                CHECKINTR(IOASIC_DEV_SCC1, IOASIC_INTR_SCC_1, 0);
                CHECKINTR(IOASIC_DEV_LANCE, IOASIC_INTR_LANCE, 0);
                CHECKINTR(IOASIC_DEV_ISDN, IOASIC_INTR_ISDN_TXLOAD |
                    IOASIC_INTR_ISDN_RXLOAD | IOASIC_INTR_ISDN_OVRUN, 1);

                if (sir != osir)
                        bus_space_write_4(sc->sc_bst, sc->sc_bsh,
                            IOASIC_INTR, sir);

                gifound |= ifound;
        } while (ifound);

        return (gifound);
}