/*      $NetBSD: central.c,v 1.9 2022/01/22 11:49:17 thorpej Exp $      */
/*      $OpenBSD: central.c,v 1.7 2010/11/11 17:58:23 miod Exp $        */

/*
 * Copyright (c) 2004 Jason L. Wright (jason@thought.net)
 * 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 THE AUTHOR ``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 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: central.c,v 1.9 2022/01/22 11:49:17 thorpej Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/kmem.h>
#include <sys/bus.h>

#include <machine/autoconf.h>
#include <machine/openfirm.h>

#include <sparc64/dev/centralvar.h>

struct central_softc {
        bus_space_tag_t sc_bt;
        bus_space_tag_t sc_cbt;
        int sc_node;
        int sc_nrange;
        struct central_range *sc_range;
};

static int central_match(device_t, cfdata_t, void *);
static void central_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(central, sizeof(struct central_softc),
    central_match, central_attach, NULL, NULL);

static int central_print(void *, const char *);
static int central_get_string(int, const char *, char **);

static bus_space_tag_t central_alloc_bus_tag(struct central_softc *);
static int _central_bus_map(
                bus_space_tag_t,
                bus_addr_t,             /*offset*/
                bus_size_t,             /*size*/
                int,                    /*flags*/
                vaddr_t,                /* XXX unused -- compat w/sparc */
                bus_space_handle_t *);

static int
central_match(device_t parent, cfdata_t match, void *aux)
{
        struct mainbus_attach_args *ma = aux;

        if (strcmp(ma->ma_name, "central") == 0)
                return (1);
        return (0);
}

static void
central_attach(device_t parent, device_t self, void *aux)
{
        struct central_softc *sc = device_private(self);
        struct mainbus_attach_args *ma = aux;
        int node0, node;

        sc->sc_bt = ma->ma_bustag;
        sc->sc_node = ma->ma_node;
        sc->sc_cbt = central_alloc_bus_tag(sc);

        prom_getprop(sc->sc_node, "ranges", sizeof(struct central_range),
            &sc->sc_nrange, (void **)&sc->sc_range);

        printf("\n");

        devhandle_t selfh = device_handle(self);
        node0 = firstchild(sc->sc_node);
        for (node = node0; node; node = nextsibling(node)) {
                struct central_attach_args ca;

                bzero(&ca, sizeof(ca));
                ca.ca_node = node;
                ca.ca_bustag = sc->sc_cbt;
                if (central_get_string(ca.ca_node, "name", &ca.ca_name)) {
                        printf("can't fetch name for node 0x%x\n", node);
                        continue;
                }

                prom_getprop(node, "reg", sizeof(struct central_reg),
                    &ca.ca_nreg, (void **)&ca.ca_reg);

                (void)config_found(self, (void *)&ca, central_print,
                    CFARGS(.devhandle = prom_node_to_devhandle(selfh,
                                                               ca.ca_node)));

                if (ca.ca_name != NULL)
                        free(ca.ca_name, M_DEVBUF);
        }
}

static int
central_get_string(int node, const char *name, char **buf)
{
        int len;

        len = prom_getproplen(node, name);
        if (len < 0)
                return (len);
        *buf = malloc(len + 1, M_DEVBUF, M_WAITOK);
        if (len != 0)
                prom_getpropstringA(node, name, *buf, len + 1);
        (*buf)[len] = '\0';
        return (0);
}

static int
central_print(void *args, const char *busname)
{
        struct central_attach_args *ca = args;
        char *class;

        if (busname != NULL) {
                printf("\"%s\" at %s", ca->ca_name, busname);
                class = prom_getpropstring(ca->ca_node, "device_type");
                if (*class != '\0')
                        printf(" class %s", class);
        }
        return (UNCONF);
}

static bus_space_tag_t
central_alloc_bus_tag(struct central_softc *sc)
{
        struct sparc_bus_space_tag *bt;

        bt = kmem_zalloc(sizeof(*bt), KM_SLEEP);
        bt->cookie = sc;
        bt->parent = sc->sc_bt;
#if 0
        bt->asi = bt->parent->asi;
        bt->sasi = bt->parent->sasi;
#endif
        bt->sparc_bus_map = _central_bus_map;
        /* XXX bt->sparc_bus_mmap = central_bus_mmap; */
        /* XXX bt->sparc_intr_establish = upa_intr_establish; */
        return (bt);
}

static int
_central_bus_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size, int flags,
        vaddr_t v, bus_space_handle_t *hp)
{
        struct central_softc *sc = t->cookie;
        int64_t slot = BUS_ADDR_IOSPACE(addr);
        int64_t offset = BUS_ADDR_PADDR(addr);
        int i;

        if (t->parent == NULL || t->parent->sparc_bus_map == NULL) {
                printf("\ncentral_bus_map: invalid parent");
                return (EINVAL);
        }


        for (i = 0; i < sc->sc_nrange; i++) {
                bus_addr_t paddr;

                if (sc->sc_range[i].cspace != slot)
                        continue;

                paddr = offset - sc->sc_range[i].coffset;
                paddr += sc->sc_range[i].poffset;
                paddr |= ((bus_addr_t)sc->sc_range[i].pspace << 32);

                return bus_space_map(t->parent, paddr, size, flags, hp);
        }

        return (EINVAL);
}