/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/ddi_impldefs.h>
#include <sys/ddi_subrdefs.h>
#include <sys/obpdefs.h>
#include <sys/cmn_err.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/sysmacros.h>
#include <sys/autoconf.h>
#include <sys/modctl.h>

/*
 * module central.c
 *
 * This module is a nexus driver designed to support the fhc nexus driver
 * and all children below it. This driver does not handle any of the
 * DDI functions passed up to it by the fhc driver, but instead allows
 * them to bubble up to the root node. A consequence of this is that
 * the maintainer of this code must watch for changes in the sun4u
 * rootnexus driver to make sure they do not break this driver or any
 * of its children.
 */

/*
 * Function Prototypes
 */
static int
central_attach(dev_info_t *devi, ddi_attach_cmd_t cmd);

static int
central_detach(dev_info_t *devi, ddi_detach_cmd_t cmd);

/*
 * Configuration Data Structures
 */
static struct bus_ops central_bus_ops = {
        BUSO_REV,
        ddi_bus_map,            /* map */
        0,                      /* get_intrspec */
        0,                      /* add_intrspec */
        0,                      /* remove_intrspec */
        i_ddi_map_fault,        /* map_fault */
        ddi_no_dma_map,         /* dma_map */
        ddi_no_dma_allochdl,
        ddi_no_dma_freehdl,
        ddi_no_dma_bindhdl,
        ddi_no_dma_unbindhdl,
        ddi_no_dma_flush,
        ddi_no_dma_win,
        ddi_dma_mctl,           /* dma_ctl */
        ddi_ctlops,             /* ctl */
        ddi_bus_prop_op,        /* prop_op */
        0,                      /* (*bus_get_eventcookie)();    */
        0,                      /* (*bus_add_eventcall)();      */
        0,                      /* (*bus_remove_eventcall)();   */
        0,                      /* (*bus_post_event)();         */
        0,                      /* (*bus_intr_ctl)();           */
        0,                      /* (*bus_config)();             */
        0,                      /* (*bus_unconfig)();           */
        0,                      /* (*bus_fm_init)();            */
        0,                      /* (*bus_fm_fini)();            */
        0,                      /* (*bus_fm_access_enter)();    */
        0,                      /* (*bus_fm_access_exit)();     */
        0,                      /* (*bus_power)();              */
        i_ddi_intr_ops          /* (*bus_intr_op)();            */
};

static struct dev_ops central_ops = {
        DEVO_REV,               /* rev */
        0,                      /* refcnt */
        ddi_no_info,            /* getinfo */
        nulldev,                /* identify */
        nulldev,                /* probe */
        central_attach,         /* attach */
        central_detach,         /* detach */
        nulldev,                /* reset */
        (struct cb_ops *)0,     /* cb_ops */
        &central_bus_ops,       /* bus_ops */
        nulldev,                /* power */
        ddi_quiesce_not_needed,         /* quiesce */
};

extern struct mod_ops mod_driverops;

static struct modldrv modldrv = {
        &mod_driverops,         /* Type of module.  This one is a driver */
        "Central Nexus",        /* Name of module. */
        &central_ops,           /* driver ops */
};

static struct modlinkage modlinkage = {
        MODREV_1,               /* rev */
        (void *)&modldrv,
        NULL
};

/*
 * These are the module initialization routines.
 */

int
_init(void)
{
        return (mod_install(&modlinkage));
}

int
_fini(void)
{
        int error;

        if ((error = mod_remove(&modlinkage)) != 0)
                return (error);

        return (0);
}

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&modlinkage, modinfop));
}

static int
central_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_ATTACH:
                break;

        case DDI_RESUME:
                return (DDI_SUCCESS);

        default:
                return (DDI_FAILURE);
        }

        /* nothing to suspend/resume here */
        (void) ddi_prop_update_string(DDI_DEV_T_NONE, devi,
            "pm-hardware-state", "no-suspend-resume");

        ddi_report_dev(devi);
        return (DDI_SUCCESS);
}

/* ARGSUSED */
static int
central_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_SUSPEND:
        case DDI_DETACH:
        default:
                return (DDI_FAILURE);
        }
}