/*      $NetBSD: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej Exp $");

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

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

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

int     lebufprint(void *, const char *);
int     lebufmatch(device_t, cfdata_t, void *);
void    lebufattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(lebuffer, sizeof(struct lebuf_softc),
    lebufmatch, lebufattach, NULL, NULL);

int
lebufprint(void *aux, const char *busname)
{

        sbus_print(aux, busname);
        return (UNCONF);
}

int
lebufmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct sbus_attach_args *sa = aux;

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

/*
 * Attach all the sub-devices we can find
 */
void
lebufattach(device_t parent, device_t self, void *aux)
{
        struct sbus_attach_args *sa = aux;
        struct lebuf_softc *sc = device_private(self);
        struct sbus_softc *sbsc = device_private(parent);
        int node;
        int sbusburst;
        bus_space_tag_t bt = sa->sa_bustag;
        bus_dma_tag_t   dt = sa->sa_dmatag;
        bus_space_handle_t bh;

        sc->sc_dev = self;

        if (sbus_bus_map(bt, sa->sa_slot, sa->sa_offset, sa->sa_size,
                         BUS_SPACE_MAP_LINEAR, &bh) != 0) {
                aprint_error(": cannot map registers\n");
                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 = bus_space_vaddr(bt, bh);
        sc->sc_bufsiz = sa->sa_size;

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

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

        sc->sc_burst = prom_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;

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

        /* search through children */
        devhandle_t selfh = device_handle(self);
        for (node = firstchild(node); node; node = nextsibling(node)) {
                struct sbus_attach_args sax;
                sbus_setup_attach_args(sbsc,
                                       bt, dt, node, &sax);
                (void)config_found(self, (void *)&sax, lebufprint,
                    CFARGS(.devhandle = prom_node_to_devhandle(selfh, node)));
                sbus_destroy_attach_args(&sax);
        }
}