/*      $OpenBSD: ogxnexus.c,v 1.1 2019/11/04 14:58:40 visa Exp $       */

/*
 * Copyright (c) 2019 Visa Hankala
 *
 * Permission to use, copy, modify, and/or 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.
 */

/*
 * Driver for OCTEON BGX nexus.
 */

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

#include <dev/ofw/fdt.h>
#include <dev/ofw/openfirm.h>

#include <machine/bus.h>
#include <machine/fdt.h>

#include <octeon/dev/ogxreg.h>
#include <octeon/dev/ogxvar.h>

struct ogxnexus_softc {
        struct device            sc_dev;
        bus_space_tag_t          sc_iot;
        bus_space_handle_t       sc_ioh;
        int                      sc_bgxid;
};

#define NEXUS_RD_8(sc, reg) \
        bus_space_write_8((sc)->sc_iot, (sc)->sc_ioh, (reg))
#define NEXUS_WR_8(sc, reg, val) \
        bus_space_write_8((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))

int     ogxnexus_match(struct device *, void *, void *);
void    ogxnexus_attach(struct device *, struct device *, void *);

const struct cfattach ogxnexus_ca = {
        sizeof(struct ogxnexus_softc), ogxnexus_match, ogxnexus_attach
};

struct cfdriver ogxnexus_cd = {
        NULL, "ogxnexus", DV_DULL
};

int
ogxnexus_match(struct device *parent, void *match, void *aux)
{
        struct fdt_attach_args *faa = aux;

        return OF_is_compatible(faa->fa_node, "cavium,octeon-7890-bgx");
}

void
ogxnexus_attach(struct device *parent, struct device *self, void *aux)
{
        struct ogx_attach_args oaa;
        struct fdt_attach_args *faa = aux;
        struct ogxnexus_softc *sc = (struct ogxnexus_softc *)self;
        int i, node;

        if (faa->fa_nreg < 1) {
                printf(": no registers\n");
                return;
        }

        sc->sc_bgxid = (faa->fa_reg[0].addr >> 24) & 7;

        sc->sc_iot = faa->fa_iot;
        if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, faa->fa_reg[0].size,
            0, &sc->sc_ioh)) {
                printf(": can't map IO space\n");
                return;
        }

        /* Disable all CAM entries. */
        for (i = 0; i < BGX_NCAM; i++)
                NEXUS_WR_8(sc, BGX_CMR_RX_ADR_CAM(i), 0);

        /* Set the number of LMACs per BGX. */
        NEXUS_WR_8(sc, BGX_CMR_RX_LMACS, BGX_NLMAC);
        NEXUS_WR_8(sc, BGX_CMR_TX_LMACS, BGX_NLMAC);

        printf("\n");

        for (node = OF_child(faa->fa_node); node != 0; node = OF_peer(node)) {
                memset(&oaa, 0, sizeof(oaa));
                oaa.oaa_node = node;
                oaa.oaa_bgxid = sc->sc_bgxid;
                oaa.oaa_iot = sc->sc_iot;
                oaa.oaa_ioh = sc->sc_ioh;
                oaa.oaa_dmat = faa->fa_dmat;

                config_found(&sc->sc_dev, &oaa, NULL);
        }
}