/*      $NetBSD: sa1111.c,v 1.28 2021/08/07 16:18:45 thorpej Exp $      */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by IWAMOTO Toshihiro.
 *
 * 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.
 */

/*
 * TODO:
 *   - introduce bus abstraction to support SA-1101
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sa1111.c,v 1.28 2021/08/07 16:18:45 thorpej Exp $");

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

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

#include <arm/sa11x0/sa11x0_reg.h>
#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_gpioreg.h>
#include <arm/sa11x0/sa1111_reg.h>
#include <arm/sa11x0/sa1111_var.h>

#include "locators.h"

static int      sa1111_print(void *, const char *);

static void     sacc_intr_calculatemasks(struct sacc_softc *);
static void     sacc_intr_setpolarity(sacc_chipset_tag_t *, int , int);

#ifdef INTR_DEBUG
#define DPRINTF(arg)    printf arg
#else
#define DPRINTF(arg)
#endif

int
sacc_probe(device_t parent, cfdata_t match, void *aux)
{
        struct sa11x0_attach_args *sa = aux;
        bus_space_handle_t ioh;
        uint32_t skid;

        if (bus_space_map(sa->sa_iot, sa->sa_addr, sa->sa_size, 0, &ioh))
                return 0;

        skid = bus_space_read_4(sa->sa_iot, ioh, SACCSBI_SKID);
        bus_space_unmap(sa->sa_iot, ioh, sa->sa_size);

        if ((skid & 0xffffff00) != 0x690cc200)
                return 0;

        return 1;
}


int
sa1111_search(device_t parent, cfdata_t cf, const int *ldesc,
    void *aux)
{
        struct sa1111_attach_args aa;

        aa.sa_addr = cf->cf_loc[SACCCF_ADDR];
        aa.sa_size = cf->cf_loc[SACCCF_SIZE];
        aa.sa_intr = cf->cf_loc[SACCCF_INTR];
#if 0
        aa.sa_membase = cf->cf_loc[SACCCF_MEMBASE];
        aa.sa_memsize = cf->cf_loc[SACCCF_MEMSIZE];
#endif

        if (config_probe(parent, cf, &aa))
                config_attach(parent, cf, &aa, sa1111_print, CFARGS_NONE);

        return 0;
}

static int
sa1111_print(void *aux, const char *name)
{

        return UNCONF;
}


void *
sacc_intr_establish(sacc_chipset_tag_t *ic, int irq, int type, int level,
    int (*ih_fun)(void *), void *ih_arg)
{
        int s;
        struct sacc_softc *sc = (struct sacc_softc *)ic;
        struct sacc_intrhand **p, *ih;

        ih = kmem_alloc(sizeof *ih, KM_SLEEP);

        if (irq < 0 || irq > SACCIC_LEN ||
            !(type == IST_EDGE_RAISE || type == IST_EDGE_FALL))
                panic("sacc_intr_establish: bogus irq or type");

        if (sc->sc_intrhand[irq] == NULL) {
                sacc_intr_setpolarity(ic, irq, type);
                sc->sc_intrtype[irq] = type;
        } else if (sc->sc_intrtype[irq] != type)
                /* XXX we should be able to share raising and
                 * falling edge intrs */
                panic("sacc_intr_establish: type must be unique");

        /* install intr handler */
        /* map interrupt level to appropriate softinterrupt level */
        level = SOFTINT_SERIAL;
        ih->ih_soft = softint_establish(level, (void (*)(void *)) ih_fun,
                                         ih_arg);
        ih->ih_irq = irq;
        ih->ih_next = NULL;

        s = splhigh();
        for (p = &sc->sc_intrhand[irq]; *p; p = &(*p)->ih_next)
                continue;

        *p = ih;

        sacc_intr_calculatemasks(sc);
        splx(s);

        return ih;
}

void
sacc_intr_disestablish(sacc_chipset_tag_t *ic, void *arg)
{
        int irq, s;
        struct sacc_softc *sc = (struct sacc_softc *)ic;
        struct sacc_intrhand *ih, **p;

        ih = (struct sacc_intrhand *)arg;
        irq = ih->ih_irq;

#ifdef DIAGNOSTIC
        if (irq < 0 || irq > SACCIC_LEN)
                panic("sacc_intr_disestablish: bogus irq");
#endif

        s = splhigh();

        for (p = &sc->sc_intrhand[irq];; p = &(*p)->ih_next) {
                if (*p == NULL)
                        panic("sacc_intr_disestablish: handler not registered");
                if (*p == ih)
                        break;
        }
        *p = (*p)->ih_next;

        sacc_intr_calculatemasks(sc);
        splx(s);

        kmem_free(ih, sizeof(*ih));
}

static void
sacc_intr_setpolarity(sacc_chipset_tag_t *ic, int irq, int type)
{
        struct sacc_softc *sc = (struct sacc_softc *)ic;
        int s;
        uint32_t pol, mask;
        int addr;

        if (irq >= 32) {
                addr = SACCIC_INTPOL1;
                irq -= 32;
        } else
                addr = SACCIC_INTPOL0;

        mask = (1 << irq);

        s = splhigh();
        pol = bus_space_read_4(sc->sc_iot, sc->sc_ioh, addr);
        if (type == IST_EDGE_RAISE)
                pol &= ~mask;
        else
                pol |= mask;
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, addr, pol);
        splx(s);
}

static void
sacc_intr_calculatemasks(struct sacc_softc *sc)
{
        int irq;

        sc->sc_imask.lo = 0;
        sc->sc_imask.hi = 0;
        for (irq = 0; irq < 32; irq++)
                if (sc->sc_intrhand[irq])
                        sc->sc_imask.lo |= (1 << irq);
        for (irq = 0; irq < SACCIC_LEN - 32; irq++)
                if (sc->sc_intrhand[irq + 32])
                        sc->sc_imask.hi |= (1 << irq);


        /* XXX this should not be done here */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACCIC_INTEN0,
                          sc->sc_imask.lo);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACCIC_INTEN1,
                          sc->sc_imask.hi);
        DPRINTF(("sacc_intr_calculatemasks: %x %x\n", sc->sc_imask.lo,
            sc->sc_imask.hi));
}