/*      $NetBSD: ralink_mainbus.c,v 1.7 2021/08/07 16:18:59 thorpej Exp $       */
/*-
 * Copyright (c) 2011 CradlePoint Technology, Inc.
 * All rights reserved.
 *
 *
 * 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 CRADLEPOINT TECHNOLOGY, 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 AUTHOR 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: ralink_mainbus.c,v 1.7 2021/08/07 16:18:59 thorpej Exp $");

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

#include <mips/cache.h>
#include <mips/cpuregs.h>

#include <mips/ralink/ralink_reg.h>
#include <mips/ralink/ralink_var.h>

typedef struct mainbus_softc {
        device_t        sc_dev;
        bus_space_tag_t sc_memt;
        bus_dma_tag_t   sc_dmat;
} mainbus_softc_t;

static int  mainbus_match(device_t, cfdata_t, void *);
static void mainbus_attach(device_t, device_t, void *);
static int  mainbus_search(device_t, cfdata_t, const int *, void *);
static int  mainbus_print(void *, const char *);
static int  mainbus_find(device_t, cfdata_t, const int *, void *);
static void mainbus_attach_critical(struct mainbus_softc *);


CFATTACH_DECL_NEW(mainbus, sizeof(struct mainbus_softc),
        mainbus_match, mainbus_attach, NULL, NULL);

static bool mainbus_found;

/*
 * critical devices, if found, will be attached in the order listed here
 */
static const struct {
        const char *name;
        bool required;
} critical_devs[] = {
        { .name = "cpu0",       .required = true  },
        { .name = "rwdog0",     .required = false },
        { .name = "rgpio0",     .required = true  },
        { .name = "ri2c0",      .required = false },
        { .name = "com0",       .required = false },
};


static int
mainbus_match(device_t parent, cfdata_t match, void *aux)
{
        if (mainbus_found)
                return 0;
        return 1;
}

static void
mainbus_attach(device_t parent, device_t self, void *aux)
{
        mainbus_softc_t * const sc = device_private(self);
        struct mainbus_attach_args ma;
        union {
                char buf[9];
                uint32_t id[2];
        } xid;

        mainbus_found = true;

        sc->sc_dev = self;
        sc->sc_memt = &ra_bus_memt;
        sc->sc_dmat = &ra_bus_dmat;

        xid.id[0] = bus_space_read_4(sc->sc_memt, ra_sysctl_bsh, RA_SYSCTL_ID0);
        xid.id[1] = bus_space_read_4(sc->sc_memt, ra_sysctl_bsh, RA_SYSCTL_ID1);
        xid.buf[8] = '\0';
        if (xid.buf[6] == ' ') {
                xid.buf[6] = '\0';
        } else if (xid.buf[7] == ' ') {
                xid.buf[7] = '\0';
        }
        const char * const manuf = xid.buf[0] == 'M' ? "Mediatek" : "Ralink";

        aprint_naive(": %s %s System Bus\n", manuf, xid.buf);
        aprint_normal(": %s %s System Bus\n", manuf, xid.buf);

        ma.ma_name = NULL;
        ma.ma_memt = sc->sc_memt;
        ma.ma_dmat = sc->sc_dmat;

        /* attach critical devices */
        mainbus_attach_critical(sc);

        /* attach other devices */
        config_search(self, &ma,
            CFARGS(.search = mainbus_search));
}

static int
mainbus_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
        struct mainbus_attach_args *ma;

        ma = aux;
        ma->ma_addr = cf->cf_loc[MAINBUSCF_ADDR];

        if (config_probe(parent, cf, aux))
                config_attach(parent, cf, aux, mainbus_print, CFARGS_NONE);
        else
                mainbus_print(aux, cf->cf_name);
        return 0;
}

int
mainbus_print(void *aux, const char *pnp)
{
        struct mainbus_attach_args *ma;

        if (pnp)
                aprint_normal("%s unconfigured\n", pnp);

        ma = aux;
        if (ma->ma_addr != MAINBUSCF_ADDR_DEFAULT)
                aprint_normal(" addr 0x%llx", ma->ma_addr);

        return UNCONF;
}

static int
mainbus_find(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
        struct mainbus_attach_args * const ma = aux;
        char devname[16];

        snprintf(devname, sizeof(devname), "%s%d", cf->cf_name, cf->cf_unit);
        if (strcmp(ma->ma_name, devname) != 0)
                return 0;

        return config_match(parent, cf, ma);
}

static void
mainbus_attach_critical(struct mainbus_softc *sc)
{
        struct mainbus_attach_args ma;
        cfdata_t cf;
        size_t i;

        for (i = 0; i < __arraycount(critical_devs); i++) {
                ma.ma_name = critical_devs[i].name;
                ma.ma_memt = sc->sc_memt;
                ma.ma_dmat = sc->sc_dmat;

                cf = config_search(sc->sc_dev, &ma,
                                   CFARGS(.submatch = mainbus_find));
                if (cf == NULL && critical_devs[i].required)
                        panic("%s: failed to find %s",
                            __func__, critical_devs[i].name);

                ma.ma_addr = cf->cf_loc[MAINBUSCF_ADDR];
                config_attach(sc->sc_dev, cf, &ma, mainbus_print, CFARGS_NONE);
        }
}