<commit_before>/*-
 * Copyright 1998 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that both the above copyright notice and this
 * permission notice appear in all copies, that both the above
 * copyright notice and this permission notice appear in all
 * supporting documentation, and that the name of M.I.T. not be used
 * in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  M.I.T. makes
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
 * SHALL M.I.T. 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.
 */
/*-
 * Copyright 2001 by <NAME> <<EMAIL>>.  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 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.
 *
 * 	from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/cons.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>

#include <machine/bus.h>
#include <machine/frame.h>
#include <machine/intr_machdep.h>
#include <machine/resource.h>

#include <sys/rman.h>

#include "ofw_bus_if.h"
#include "pic_if.h"

/*
 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
 * exist in Open Firmware and adds them as devices to this bus so that drivers
 * can be attached to them.
 *
 * Maybe this code should get into dev/ofw to some extent, as some of it should
 * work for all Open Firmware based machines...
 */

static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");

struct nexus_devinfo {
	struct ofw_bus_devinfo ndi_ofwinfo;
};

struct nexus_softc {
	struct rman	sc_rman;
};

/*
 * Device interface
 */
static int	nexus_probe(device_t);
static int	nexus_attach(device_t);

/*
 * Bus interface
 */
static device_t nexus_add_child(device_t, u_int, const char *, int);
static void	nexus_probe_nomatch(device_t, device_t);
#ifdef SMP
static int	nexus_bind_intr(device_t dev, device_t child,
		    struct resource *irq, int cpu);
#endif
static int	nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
		    enum intr_polarity pol);
static int	nexus_setup_intr(device_t, device_t, struct resource *, int,
		    driver_filter_t *, driver_intr_t *, void *, void **);
static int	nexus_teardown_intr(device_t, device_t, struct resource *,
		    void *);
static struct	resource *nexus_alloc_resource(device_t, device_t, int, int *,
		    u_long, u_long, u_long, u_int);
static int	nexus_activate_resource(device_t, device_t, int, int,
		    struct resource *);
static int	nexus_deactivate_resource(device_t, device_t, int, int,
		    struct resource *);
static int	nexus_release_resource(device_t, device_t, int, int,
		    struct resource *);
static const struct ofw_bus_devinfo *nexus_get_devinfo(device_t dev,
		    device_t child);

/*
 * Local routines
 */
static device_t	nexus_device_from_node(device_t, phandle_t);

static device_method_t nexus_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		nexus_probe),
	DEVMETHOD(device_attach,	nexus_attach),
	DEVMETHOD(device_detach,	bus_generic_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	bus_generic_suspend),
	DEVMETHOD(device_resume,	bus_generic_resume),

	/* Bus interface. Resource management is business of the children... */
	DEVMETHOD(bus_add_child,	nexus_add_child),
	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
	DEVMETHOD(bus_probe_nomatch,	nexus_probe_nomatch),
	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
#ifdef SMP
	DEVMETHOD(bus_bind_intr,	nexus_bind_intr),
#endif
	DEVMETHOD(bus_config_intr,	nexus_config_intr),
	DEVMETHOD(bus_alloc_resource,	nexus_alloc_resource),
	DEVMETHOD(bus_activate_resource,	nexus_activate_resource),
	DEVMETHOD(bus_deactivate_resource,	nexus_deactivate_resource),
	DEVMETHOD(bus_release_resource,	nexus_release_resource),

	/* OFW bus interface */
	DEVMETHOD(ofw_bus_get_devinfo,	nexus_get_devinfo),
	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),

	DEVMETHOD_END
};

static driver_t nexus_driver = {
	"nexus",
	nexus_methods,
	sizeof(struct nexus_softc),
};

static devclass_t nexus_devclass;

EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
    BUS_PASS_BUS);

static int
nexus_probe(device_t dev)
{
	bus_generic_probe(dev);
	device_set_desc(dev, "Open Firmware Nexus device");
	return (0);
}

static int
nexus_attach(device_t dev)
{
	phandle_t	root;
	phandle_t	child;
	struct		nexus_softc *sc;
	u_long		start, end;

	sc = device_get_softc(dev);

	start = 0;
	end = ~0;

	sc->sc_rman.rm_start = start;
	sc->sc_rman.rm_end = end;
	sc->sc_rman.rm_type = RMAN_ARRAY;
	sc->sc_rman.rm_descr = "Interrupt request lines";
	if (rman_init(&sc->sc_rman) ||
	    rman_manage_region(&sc->sc_rman, start, end))
		panic("nexus_probe IRQ rman");

	if ((root = OF_peer(0)) == 0)
		return (bus_generic_attach(dev));
		
	/*
	 * Now walk the OFW tree to locate top-level devices
	 */
	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
		if (child == -1)
			panic("nexus_probe(): OF_child failed.");
		(void)nexus_device_from_node(dev, child);

	}

	return (bus_generic_attach(dev));
}

static void
nexus_probe_nomatch(device_t dev, device_t child)
{
	const char *name, *type;

	name = ofw_bus_get_name(child);
	type = ofw_bus_get_type(child);

	if (name == NULL)
		name = "unknown";
	if (type == NULL)
		type = "(unknown)";

	if (bootverbose)
		device_printf(dev, "<%s>, type %s (no driver attached)\n",
		    name, type);
}

static device_t
nexus_add_child(device_t dev, u_int order, const char *name, int unit)
{
	device_t child;
	struct nexus_devinfo *dinfo;

	child = device_add_child_ordered(dev, order, name, unit);
	if (child == NULL)
		return (NULL);

	dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO);
	if (dinfo == NULL)
		return (NULL);

	dinfo->ndi_ofwinfo.obd_node = -1;
	dinfo->ndi_ofwinfo.obd_name = NULL;
	dinfo->ndi_ofwinfo.obd_compat = NULL;
	dinfo->ndi_ofwinfo.obd_type = NULL;
	dinfo->ndi_ofwinfo.obd_model = NULL;

	device_set_ivars(child, dinfo);

        return (child);
}

static int
nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
    driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
{
	int		error;

	/* somebody tried to setup an irq that failed to allocate! */
	if (res == NULL)
		panic("nexus_setup_intr: NULL irq resource!");

	*cookiep = 0;
	if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
		flags |= INTR_EXCL;

	/*
	 * We depend here on rman_activate_resource() being idempotent.
	 */
	error = rman_activate_resource(res);
	if (error)
		return (error);

	error = powerpc_setup_intr(device_get_nameunit(child),
	    rman_get_start(res), filter, ihand, arg, flags, cookiep);

	return (error);
}

static int
nexus_teardown_intr(device_t dev, device_t child, struct resource *res,
    void *cookie)
{

	return (powerpc_teardown_intr(cookie));
}

#ifdef SMP
static int
nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
{

        return (powerpc_bind_intr(rman_get_start(irq), cpu));
}
#endif
        
static int
nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
    enum intr_polarity pol)
{

        return (powerpc_config_intr(irq, trig, pol));
}

/*
 * Allocate resources at the behest of a child.  This only handles interrupts,
 * since I/O resources are handled by child busses.
 */
static struct resource *
nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
    u_long start, u_long end, u_long count, u_int flags)
{
	struct nexus_softc *sc;
	struct resource *rv;

	if (type != SYS_RES_IRQ) {
		device_printf(bus, "unknown resource request from %s\n",
		    device_get_nameunit(child));
		return (NULL);
	}

	if (count == 0 || start + count - 1 != end) {
		device_printf(bus, "invalid IRQ allocation from %s\n",
		    device_get_nameunit(child));
		return (NULL);
	}

	sc = device_get_softc(bus);

	rv = rman_reserve_resource(&sc->sc_rman, start, end, count,
	    flags, child);
	if (rv == NULL) {
		device_printf(bus, "IRQ allocation failed for %s\n",
		    device_get_nameunit(child));
	} else
		rman_set_rid(rv, *rid);

	return (rv);
}

static int
nexus_activate_resource(device_t bus, device_t child, int type, int rid,
    struct resource *res)
{

	/* Not much to be done yet... */
	return (rman_activate_resource(res));
}

static int
nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
    struct resource *res)
{

	/* Not much to be done yet... */
	return (rman_deactivate_resource(res));
}

static int
nexus_release_resource(device_t bus, device_t child, int type, int rid,
    struct resource *res)
{

	if (type != SYS_RES_IRQ) {
		device_printf(bus, "unknown resource request from %s\n",
		    device_get_nameunit(child));
		return (EINVAL);
	}

	return (rman_release_resource(res));
}

static device_t
nexus_device_from_node(device_t parent, phandle_t node)
{
	device_t	cdev;
	struct		nexus_devinfo *dinfo;

	cdev = device_add_child(parent, NULL, -1);
	if (cdev != NULL) {
		dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
		ofw_bus_gen_setup_devinfo(&dinfo->ndi_ofwinfo, node);
		device_set_ivars(cdev, dinfo);
	}

	return (cdev);
}

static const struct ofw_bus_devinfo *
nexus_get_devinfo(device_t dev, device_t child)
{
	struct nexus_devinfo *dinfo;

	dinfo = device_get_ivars(child);
	return (&dinfo->ndi_ofwinfo);
}

<commit_msg>MFC r256901, r256914 (by nwhitehorn):<commit_after>/*-
 * Copyright 1998 Massachusetts Institute of Technology
 * Copyright 2001 by <NAME> <<EMAIL>>.
 * Copyright 2006 by <NAME>bl <<EMAIL>>.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that both the above copyright notice and this
 * permission notice appear in all copies, that both the above
 * copyright notice and this permission notice appear in all
 * supporting documentation, and that the name of M.I.T. not be used
 * in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  M.I.T. makes
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
 * SHALL M.I.T. 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.
 *
 * 	from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/pcpu.h>
#include <sys/rman.h>

#include <vm/vm.h>
#include <vm/pmap.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>

#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/resource.h>

/*
 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
 * hang from the Open Firmware root node and adds them as devices to this bus
 * (except some special nodes which are excluded) so that drivers can be
 * attached to them.
 *
 * Additionally, interrupt setup/teardown and some resource management are
 * done at this level.
 *
 * Maybe this code should get into dev/ofw to some extent, as some of it should
 * work for all Open Firmware based machines...
 */

struct nexus_devinfo {
	struct ofw_bus_devinfo	ndi_obdinfo;
	struct resource_list	ndi_rl;
};

struct nexus_softc {
	uint32_t	acells, scells;
	struct rman	sc_intr_rman;
	struct rman	sc_mem_rman;
};

static device_probe_t nexus_probe;
static device_attach_t nexus_attach;
static bus_print_child_t nexus_print_child;
static bus_add_child_t nexus_add_child;
static bus_probe_nomatch_t nexus_probe_nomatch;
static bus_setup_intr_t nexus_setup_intr;
static bus_teardown_intr_t nexus_teardown_intr;
static bus_alloc_resource_t nexus_alloc_resource;
static bus_activate_resource_t nexus_activate_resource;
static bus_deactivate_resource_t nexus_deactivate_resource;
static bus_adjust_resource_t nexus_adjust_resource;
static bus_release_resource_t nexus_release_resource;
static bus_get_resource_list_t nexus_get_resource_list;
#ifdef SMP
static bus_bind_intr_t nexus_bind_intr;
#endif
static bus_config_intr_t nexus_config_intr;
static ofw_bus_get_devinfo_t nexus_get_devinfo;

static int nexus_inlist(const char *, const char *const *);
static struct nexus_devinfo * nexus_setup_dinfo(device_t, phandle_t);
static void nexus_destroy_dinfo(struct nexus_devinfo *);
static int nexus_print_res(struct nexus_devinfo *);

static device_method_t nexus_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		nexus_probe),
	DEVMETHOD(device_attach,	nexus_attach),
	DEVMETHOD(device_detach,	bus_generic_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	bus_generic_suspend),
	DEVMETHOD(device_resume,	bus_generic_resume),

	/* Bus interface */
	DEVMETHOD(bus_print_child,	nexus_print_child),
	DEVMETHOD(bus_probe_nomatch,	nexus_probe_nomatch),
	DEVMETHOD(bus_read_ivar,	bus_generic_read_ivar),
	DEVMETHOD(bus_write_ivar,	bus_generic_write_ivar),
	DEVMETHOD(bus_add_child,	nexus_add_child),
	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
	DEVMETHOD(bus_alloc_resource,	nexus_alloc_resource),
	DEVMETHOD(bus_activate_resource,	nexus_activate_resource),
	DEVMETHOD(bus_deactivate_resource,	nexus_deactivate_resource),
	DEVMETHOD(bus_adjust_resource,	nexus_adjust_resource),
	DEVMETHOD(bus_release_resource,	nexus_release_resource),
	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
	DEVMETHOD(bus_set_resource,	bus_generic_rl_set_resource),
	DEVMETHOD(bus_get_resource,	bus_generic_rl_get_resource),
	DEVMETHOD(bus_get_resource_list, nexus_get_resource_list),
#ifdef SMP
	DEVMETHOD(bus_bind_intr,	nexus_bind_intr),
#endif
	DEVMETHOD(bus_config_intr,	nexus_config_intr),

	/* ofw_bus interface */
	DEVMETHOD(ofw_bus_get_devinfo,	nexus_get_devinfo),
	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),

	DEVMETHOD_END
};

static devclass_t nexus_devclass;

DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, sizeof(struct nexus_softc));
EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
    BUS_PASS_BUS);
MODULE_VERSION(nexus, 1);

static const char *const nexus_excl_name[] = {
	"FJSV,system",
	"aliases",
	"associations",
	"chosen",
	"cmp",
	"counter-timer",	/* No separate device; handled by psycho/sbus */
	"failsafe",
	"memory",
	"openprom",
	"options",
	"packages",
	"physical-memory",
	"rsc",
	"sgcn",
	"todsg",
	"virtual-memory",
	NULL
};

static const char *const nexus_excl_type[] = {
	"core",
	"cpu",
	NULL
};

extern struct bus_space_tag nexus_bustag;
extern struct bus_dma_tag nexus_dmatag;

static int
nexus_inlist(const char *name, const char *const *list)
{
	int i;

	if (name == NULL)
		return (0);
	for (i = 0; list[i] != NULL; i++)
		if (strcmp(name, list[i]) == 0)
			return (1);
	return (0);
}

#define	NEXUS_EXCLUDED(name, type)					\
	(nexus_inlist((name), nexus_excl_name) ||			\
	((type) != NULL && nexus_inlist((type), nexus_excl_type)))

static int
nexus_probe(device_t dev)
{

	/* Nexus does always match. */
	device_set_desc(dev, "Open Firmware Nexus device");
	return (0);
}

static int
nexus_attach(device_t dev)
{
	struct nexus_devinfo *ndi;
	struct nexus_softc *sc;
	device_t cdev;
	phandle_t node;

	sc = device_get_softc(dev);

	if (strcmp(device_get_name(device_get_parent(dev)), "root") == 0) {
		node = OF_peer(0);

		sc->sc_intr_rman.rm_type = RMAN_ARRAY;
		sc->sc_intr_rman.rm_descr = "Interrupts";
		sc->sc_mem_rman.rm_type = RMAN_ARRAY;
		sc->sc_mem_rman.rm_descr = "Device Memory";
		if (rman_init(&sc->sc_intr_rman) != 0 ||
		    rman_init(&sc->sc_mem_rman) != 0 ||
		    rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 ||
		    rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR)
		     != 0)
			panic("%s: failed to set up rmans.", __func__);
	} else
		node = ofw_bus_get_node(dev);

	/*
	 * Allow devices to identify.
	 */
	bus_generic_probe(dev);

	/*
	 * If no Open Firmware, bail early
	 */
	if (node == -1)
		return (bus_generic_attach(dev));

	/*
	 * Some important numbers
	 */
	sc->acells = 2;
	OF_getprop(node, "#address-cells", &sc->acells, sizeof(sc->acells));
	sc->scells = 1;
	OF_getprop(node, "#size-cells", &sc->scells, sizeof(sc->scells));

	/*
	 * Now walk the OFW tree and attach top-level devices.
	 */
	for (node = OF_child(node); node > 0; node = OF_peer(node)) {
		if ((ndi = nexus_setup_dinfo(dev, node)) == NULL)
			continue;
		cdev = device_add_child(dev, NULL, -1);
		if (cdev == NULL) {
			device_printf(dev, "<%s>: device_add_child failed\n",
			    ndi->ndi_obdinfo.obd_name);
			nexus_destroy_dinfo(ndi);
			continue;
		}
		device_set_ivars(cdev, ndi);
	}
	return (bus_generic_attach(dev));
}

static device_t
nexus_add_child(device_t dev, u_int order, const char *name, int unit)
{
	device_t cdev;
	struct nexus_devinfo *ndi;

	cdev = device_add_child_ordered(dev, order, name, unit);
	if (cdev == NULL)
		return (NULL);

	ndi = malloc(sizeof(*ndi), M_DEVBUF, M_WAITOK | M_ZERO);
	ndi->ndi_obdinfo.obd_node = -1;
	resource_list_init(&ndi->ndi_rl);
	device_set_ivars(cdev, ndi);

	return (cdev);
}

static int
nexus_print_child(device_t bus, device_t child)
{
	int rv;

	rv = bus_print_child_header(bus, child);
	rv += nexus_print_res(device_get_ivars(child));
	rv += bus_print_child_footer(bus, child);
	return (rv);
}

static void
nexus_probe_nomatch(device_t bus, device_t child)
{
	const char *name, *type;

	if (!bootverbose)
		return;

	name = ofw_bus_get_name(child);
	type = ofw_bus_get_type(child);

	device_printf(bus, "<%s>",
	    name != NULL ? name : "unknown");
	nexus_print_res(device_get_ivars(child));
	printf(" type %s (no driver attached)\n",
	    type != NULL ? type : "unknown");
}

static int
nexus_setup_intr(device_t bus __unused, device_t child, struct resource *r,
    int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg,
    void **cookiep)
{
	int error;

	if (r == NULL)
		panic("%s: NULL interrupt resource!", __func__);

	if ((rman_get_flags(r) & RF_SHAREABLE) == 0)
		flags |= INTR_EXCL;

	/* We depend here on rman_activate_resource() being idempotent. */
	error = rman_activate_resource(r);
	if (error)
		return (error);

	error = powerpc_setup_intr(device_get_nameunit(child),
	    rman_get_start(r), filt, intr, arg, flags, cookiep);

	return (error);
}

static int
nexus_teardown_intr(device_t bus __unused, device_t child __unused,
    struct resource *r, void *ih)
{
        
	if (r == NULL)
		return (EINVAL);

	return (powerpc_teardown_intr(ih));
}

#ifdef SMP
static int
nexus_bind_intr(device_t bus __unused, device_t child __unused,
    struct resource *r, int cpu)
{

	return (powerpc_bind_intr(rman_get_start(r), cpu));
}
#endif

static int
nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
    enum intr_polarity pol)
{
 
	return (powerpc_config_intr(irq, trig, pol));
} 

static struct resource *
nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
    u_long start, u_long end, u_long count, u_int flags)
{
	struct nexus_softc *sc;
	struct rman *rm;
	struct resource *rv;
	struct resource_list_entry *rle;
	device_t nexus;
	int isdefault, passthrough;

	isdefault = (start == 0UL && end == ~0UL);
	passthrough = (device_get_parent(child) != bus);
	nexus = bus;
	while (strcmp(device_get_name(device_get_parent(nexus)), "root") != 0)
		nexus = device_get_parent(nexus);
	sc = device_get_softc(nexus);
	rle = NULL;

	if (!passthrough && isdefault) {
		rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
		    type, *rid);
		if (rle == NULL)
			return (NULL);
		if (rle->res != NULL)
			panic("%s: resource entry is busy", __func__);
		start = rle->start;
		count = ulmax(count, rle->count);
		end = ulmax(rle->end, start + count - 1);
	}

	switch (type) {
	case SYS_RES_IRQ:
		rm = &sc->sc_intr_rman;
		break;
	case SYS_RES_MEMORY:
		rm = &sc->sc_mem_rman;
		break;
	default:
		return (NULL);
	}

	rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
	    child);
	if (rv == NULL)
		return (NULL);
	rman_set_rid(rv, *rid);

	if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type,
	    *rid, rv) != 0) {
		rman_release_resource(rv);
		return (NULL);
	}

	if (!passthrough && rle != NULL) {
		rle->res = rv;
		rle->start = rman_get_start(rv);
		rle->end = rman_get_end(rv);
		rle->count = rle->end - rle->start + 1;
	}

	return (rv);
}

static int
nexus_activate_resource(device_t bus __unused, device_t child __unused,
    int type, int rid __unused, struct resource *r)
{

	if (type == SYS_RES_MEMORY) {
		vm_offset_t start;
		void *p;

		start = (vm_offset_t) rman_get_start(r);
		if (bootverbose)
			printf("nexus mapdev: start %zx, len %ld\n", start,
			    rman_get_size(r));

		p = pmap_mapdev(start, (vm_size_t) rman_get_size(r));
		if (p == NULL)
			return (ENOMEM);
		rman_set_virtual(r, p);
		rman_set_bustag(r, &bs_be_tag);
		rman_set_bushandle(r, (u_long)p);
	}
	return (rman_activate_resource(r));
}

static int
nexus_deactivate_resource(device_t bus __unused, device_t child __unused,
    int type __unused, int rid __unused, struct resource *r)
{

	/*
	 * If this is a memory resource, unmap it.
	 */
	if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
		bus_size_t psize;

		psize = rman_get_size(r);
		pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
	}

	return (rman_deactivate_resource(r));
}

static int
nexus_adjust_resource(device_t bus, device_t child __unused, int type,
    struct resource *r, u_long start, u_long end)
{
	struct nexus_softc *sc;
	struct rman *rm;
	device_t nexus;

	nexus = bus;
	while (strcmp(device_get_name(device_get_parent(nexus)), "root") != 0)
		nexus = device_get_parent(nexus);
	sc = device_get_softc(nexus);
	switch (type) {
	case SYS_RES_IRQ:
		rm = &sc->sc_intr_rman;
		break;
	case SYS_RES_MEMORY:
		rm = &sc->sc_mem_rman;
		break;
	default:
		return (EINVAL);
	}
	if (rm == NULL)
		return (ENXIO);
	if (rman_is_region_manager(r, rm) == 0)
		return (EINVAL);
	return (rman_adjust_resource(r, start, end));
}

static int
nexus_release_resource(device_t bus __unused, device_t child, int type,
    int rid, struct resource *r)
{
	int error;

	if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
		error = bus_deactivate_resource(child, type, rid, r);
		if (error)
			return (error);
	}
	return (rman_release_resource(r));
}

static struct resource_list *
nexus_get_resource_list(device_t bus __unused, device_t child)
{
	struct nexus_devinfo *ndi;

	ndi = device_get_ivars(child);
	return (&ndi->ndi_rl);
}

static const struct ofw_bus_devinfo *
nexus_get_devinfo(device_t bus __unused, device_t child)
{
	struct nexus_devinfo *ndi;

	ndi = device_get_ivars(child);
	return (&ndi->ndi_obdinfo);
}

static struct nexus_devinfo *
nexus_setup_dinfo(device_t dev, phandle_t node)
{
	struct nexus_softc *sc;
	struct nexus_devinfo *ndi;
	uint32_t *reg, *intr, icells;
	uint64_t phys, size;
	phandle_t iparent;
	int i, j;
	int nintr;
	int nreg;

	sc = device_get_softc(dev);

	ndi = malloc(sizeof(*ndi), M_DEVBUF, M_WAITOK | M_ZERO);
	if (ofw_bus_gen_setup_devinfo(&ndi->ndi_obdinfo, node) != 0) {
		free(ndi, M_DEVBUF);
		return (NULL);
	}
	if (NEXUS_EXCLUDED(ndi->ndi_obdinfo.obd_name,
	    ndi->ndi_obdinfo.obd_type)) {
		ofw_bus_gen_destroy_devinfo(&ndi->ndi_obdinfo);
		free(ndi, M_DEVBUF);
		return (NULL);
	}

	resource_list_init(&ndi->ndi_rl);
	nreg = OF_getprop_alloc(node, "reg", sizeof(*reg), (void **)&reg);
	if (nreg == -1)
		nreg = 0;
	if (nreg % (sc->acells + sc->scells) != 0) {
		if (bootverbose)
			device_printf(dev, "Malformed reg property on <%s>\n",
			    ndi->ndi_obdinfo.obd_name);
		nreg = 0;
	}

	for (i = 0; i < nreg; i += sc->acells + sc->scells) {
		phys = size = 0;
		for (j = 0; j < sc->acells; j++) {
			phys <<= 32;
			phys |= reg[i + j];
		}
		for (j = 0; j < sc->scells; j++) {
			size <<= 32;
			size |= reg[i + sc->acells + j];
		}
		/* Skip the dummy reg property of glue devices like ssm(4). */
		if (size != 0)
			resource_list_add(&ndi->ndi_rl, SYS_RES_MEMORY, i,
			    phys, phys + size - 1, size);
	}
	free(reg, M_OFWPROP);

	nintr = OF_getprop_alloc(node, "interrupts",  sizeof(*intr),
	    (void **)&intr);
	if (nintr > 0) {
		iparent = 0;
		OF_searchprop(node, "interrupt-parent", &iparent,
		    sizeof(iparent));
		OF_searchprop(iparent, "#interrupt-cells", &icells,
		    sizeof(icells));
		for (i = 0; i < nintr; i+= icells) {
			intr[i] = MAP_IRQ(iparent, intr[i]);
			resource_list_add(&ndi->ndi_rl, SYS_RES_IRQ, i, intr[i],
			    intr[i], 1);
			if (icells > 1) {
				powerpc_config_intr(intr[i], (intr[i+1] & 1) ?
				    INTR_TRIGGER_LEVEL : INTR_TRIGGER_EDGE,
				    INTR_POLARITY_LOW);
			}
		}
		free(intr, M_OFWPROP);
	}

	return (ndi);
}

static void
nexus_destroy_dinfo(struct nexus_devinfo *ndi)
{

	resource_list_free(&ndi->ndi_rl);
	ofw_bus_gen_destroy_devinfo(&ndi->ndi_obdinfo);
	free(ndi, M_DEVBUF);
}

static int
nexus_print_res(struct nexus_devinfo *ndi)
{
	int rv;

	rv = 0;
	rv += resource_list_print_type(&ndi->ndi_rl, "mem", SYS_RES_MEMORY,
	    "%#lx");
	rv += resource_list_print_type(&ndi->ndi_rl, "irq", SYS_RES_IRQ,
	    "%ld");
	return (rv);
}


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