/*      $Id: exb.c,v 1.5 2021/08/07 16:19:03 thorpej Exp $      */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software developed for The NetBSD Foundation
 * by Masao Uebayashi.
 *
 * 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: exb.c,v 1.5 2021/08/07 16:19:03 thorpej Exp $");

#include "locators.h"

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

#include <powerpc/ibm4xx/dcr4xx.h>
#include <powerpc/ibm4xx/dev/exbvar.h>

struct exb_softc {
};

extern const struct exb_conf exb_confs[];

static int exb_match(device_t, cfdata_t, void *);
static void exb_attach(device_t, device_t, void *);
static int exb_print(void *, const char *);

CFATTACH_DECL_NEW(exb, sizeof(struct exb_softc), exb_match, exb_attach,
    NULL, NULL);

static struct powerpc_bus_space exb_bus_space_tag =
    { _BUS_SPACE_BIG_ENDIAN | _BUS_SPACE_MEM_TYPE, 0 };

static int
exb_match(device_t parent, cfdata_t cf, void *aux)
{

        return 1;
}

static void
exb_attach(device_t parent, device_t self, void *aux)
{
        const struct exb_conf *ec = exb_confs;
        uint32_t ebc0_bNcr;
        bus_addr_t base, size;
        int locs[EXBCF_NLOCS];

        printf("\n");

        /* mtdcr needs a constant */
        switch (device_unit(self)) {
        case 0: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B0CR); break;
        case 1: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B1CR); break;
        case 2: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B2CR); break;
        case 3: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B3CR); break;
        case 4: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B4CR); break;
        case 5: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B5CR); break;
        case 6: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B6CR); break;
        case 7: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B7CR); break;
        }
        ebc0_bNcr = mfdcr(DCR_EBC0_CFGDATA);
        base = ebc0_bNcr & 0xfff00000;
        size = 0x00100000 << ((ebc0_bNcr & 0x000e0000) >> 17);

        exb_bus_space_tag.pbs_base = base;
        exb_bus_space_tag.pbs_limit = base + size - 1;

        while (ec->ec_name) {
                struct exb_conf ec1;

                locs[EXBCF_ADDR] = ec->ec_addr;

                ec1 = *ec;
                ec1.ec_bust = exb_get_bus_space_tag();

                config_found(self, &ec1, exb_print,
                    CFARGS(.submatch = config_stdsubmatch,
                           .locators = locs));
                ec++;
        }
}

static int
exb_print(void *aux, const char *bus)
{
        struct exb_conf *ec = aux;

        if (bus)
                return QUIET;

        if (ec->ec_addr)
                printf(" addr %"PRIxBUSADDR, ec->ec_addr);

        return UNCONF;
}

bus_space_tag_t
exb_get_bus_space_tag(void)
{
        static char ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)]
            __attribute__((aligned(8)));
        static int exb_bus_space_tag_inited;

        if (exb_bus_space_tag_inited == 0) {
                if (bus_space_init(&exb_bus_space_tag, "exbtag",
                    ex_storage, sizeof(ex_storage)))
                        panic("exb_attach: Failed to initialise exb_bus_space_tag");
                exb_bus_space_tag_inited = 1;
        }
        return &exb_bus_space_tag;
}