/*      $OpenBSD: lebuffer.c,v 1.11 2022/03/13 13:34:54 mpi Exp $       */
/*      $NetBSD: lebuffer.c,v 1.12 2002/03/11 16:00:57 pk Exp $ */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Paul Kranenburg.
 *
 * 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/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/malloc.h>

#include <machine/bus.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>

int     lebufprint(void *, const char *);
int     lebufmatch(struct device *, void *, void *);
void    lebufattach(struct device *, struct device *, void *);

const struct cfattach lebuffer_ca = {
        sizeof(struct lebuf_softc), lebufmatch, lebufattach
};

int
lebufprint(void *aux, const char *busname)
{
        struct sbus_attach_args *sa = aux;
        bus_space_tag_t t = sa->sa_bustag;
        struct lebuf_softc *sc = t->cookie;

        sa->sa_bustag = sc->sc_bustag;  /* XXX */
        sbus_print(aux, busname);       /* XXX */
        sa->sa_bustag = t;              /* XXX */
        return (UNCONF);
}

int
lebufmatch(struct device *parent, void *vcf, void *aux)
{
        struct sbus_attach_args *sa = aux;
        struct cfdata *cf = vcf;

        return (strcmp(cf->cf_driver->cd_name, sa->sa_name) == 0);
}

/*
 * Attach all the sub-devices we can find
 */
void
lebufattach(struct device *parent, struct device *self, void *aux)
{
        struct sbus_attach_args *sa = aux;
        struct lebuf_softc *sc = (void *)self;
        int node;
        int sbusburst;
        struct sparc_bus_space_tag *sbt;
        bus_space_handle_t bh;

        sc->sc_bustag = sa->sa_bustag;
        sc->sc_dmatag = sa->sa_dmatag;

        if (sbus_bus_map(sa->sa_bustag,
            sa->sa_slot, sa->sa_offset, sa->sa_size,
            BUS_SPACE_MAP_LINEAR, 0, &bh) != 0) {
                printf("%s: attach: cannot map registers\n", self->dv_xname);
                return;
        }

        /*
         * This device's "register space" is just a buffer where the
         * Lance ring-buffers can be stored. Note the buffer's location
         * and size, so the `le' driver can pick them up.
         */
        sc->sc_buffer = (void *)bus_space_vaddr(sa->sa_bustag, bh);
        sc->sc_bufsiz = sa->sa_size;

        node = sc->sc_node = sa->sa_node;

        /*
         * Get transfer burst size from PROM
         */
        sbusburst = ((struct sbus_softc *)parent)->sc_burst;
        if (sbusburst == 0)
                sbusburst = SBUS_BURST_32 - 1; /* 1->16 */

        sc->sc_burst = getpropint(node, "burst-sizes", -1);
        if (sc->sc_burst == -1)
                /* take SBus burst sizes */
                sc->sc_burst = sbusburst;

        /* Clamp at parent's burst sizes */
        sc->sc_burst &= sbusburst;

        /* Allocate a bus tag */
        sbt = malloc(sizeof(*sbt), M_DEVBUF, M_NOWAIT | M_ZERO);
        if (sbt == NULL) {
                printf("%s: attach: out of memory\n", self->dv_xname);
                return;
        }

        printf(": %dK memory\n", sc->sc_bufsiz / 1024);

        sbt->cookie = sc;
        sbt->parent = sc->sc_bustag;
        sbt->asi = sbt->parent->asi;
        sbt->sasi = sbt->parent->sasi;

        /* search through children */
        for (node = firstchild(node); node; node = nextsibling(node)) {
                struct sbus_attach_args sa;
                sbus_setup_attach_args((struct sbus_softc *)parent,
                    sbt, sc->sc_dmatag, node, &sa);
                (void)config_found(&sc->sc_dev, (void *)&sa, lebufprint);
                sbus_destroy_attach_args(&sa);
        }
}