/*
 * 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.
 */
/*
 * Copyright 2012 Garrett D'Amore <garrett@damore.org>.  All rights reserved.
 */


/*
 *      PCI to PCI bus bridge nexus driver
 */

#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/modctl.h>
#include <sys/autoconf.h>
#include <sys/ddi_impldefs.h>
#include <sys/ddi_subrdefs.h>
#include <sys/ddifm.h>
#include <sys/fm/util.h>
#include <sys/fm/protocol.h>
#include <sys/fm/io/pci.h>
#include <sys/pci.h>
#include <sys/pci/pci_nexus.h>
#include <sys/pci/pci_regs.h>
#include <sys/pci/pci_simba.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/promif.h>         /* prom_printf */
#include <sys/open.h>
#include <sys/stat.h>
#include <sys/file.h>

#if defined(DEBUG) && !defined(lint)
static uint_t simba_debug_flags = 0;
#define D_IDENTIFY      0x00000001
#define D_ATTACH        0x00000002
#define D_DETACH        0x00000004
#define D_MAP           0x00000008
#define D_CTLOPS        0x00000010
#define D_G_ISPEC       0x00000020
#define D_A_ISPEC       0x00000040
#define D_INIT_CLD      0x00400000
#define D_FAULT         0x00000080

#define DEBUG0(f, s) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n")

#define DEBUG1(f, s, a) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a)

#define DEBUG2(f, s, a, b) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a, b)

#define DEBUG3(f, s, a, b, c) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a, b, c)

#define DEBUG4(f, s, a, b, c, d) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a, b, c, d)

#define DEBUG5(f, s, a, b, c, d, e) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a, b, c, d, e)

#define DEBUG6(f, s, a, b, c, d, e, ff) if ((f)& simba_debug_flags) \
        prom_printf("simba: " s "\n", a, b, c, d, e, ff)

#else

#define DEBUG0(f, s)
#define DEBUG1(f, s, a)
#define DEBUG2(f, s, a, b)
#define DEBUG3(f, s, a, b, c)
#define DEBUG4(f, s, a, b, c, d)
#define DEBUG5(f, s, a, b, c, d, e)
#define DEBUG6(f, s, a, b, c, d, e, ff)

#endif

/*
 * The variable controls the default setting of the command register
 * for pci devices.  See simba_initchild() for details.
 */
static ushort_t simba_command_default = PCI_COMM_SERR_ENABLE |
                                        PCI_COMM_WAIT_CYC_ENAB |
                                        PCI_COMM_PARITY_DETECT |
                                        PCI_COMM_ME |
                                        PCI_COMM_MAE |
                                        PCI_COMM_IO;

static int simba_bus_map(dev_info_t *, dev_info_t *, ddi_map_req_t *,
        off_t, off_t, caddr_t *);
static int simba_ctlops(dev_info_t *, dev_info_t *, ddi_ctl_enum_t,
        void *, void *);
static int simba_fm_init_child(dev_info_t *dip, dev_info_t *tdip, int cap,
                ddi_iblock_cookie_t *ibc);
static void simba_bus_enter(dev_info_t *dip, ddi_acc_handle_t handle);
static void simba_bus_exit(dev_info_t *dip, ddi_acc_handle_t handle);

struct bus_ops simba_bus_ops = {
        BUSO_REV,
        simba_bus_map,
        0,
        0,
        0,
        i_ddi_map_fault,
        0,
        ddi_dma_allochdl,
        ddi_dma_freehdl,
        ddi_dma_bindhdl,
        ddi_dma_unbindhdl,
        ddi_dma_flush,
        ddi_dma_win,
        ddi_dma_mctl,
        simba_ctlops,
        ddi_bus_prop_op,
        ndi_busop_get_eventcookie,
        ndi_busop_add_eventcall,
        ndi_busop_remove_eventcall,
        ndi_post_event,
        0,
        0,
        0,
        simba_fm_init_child,
        NULL,
        simba_bus_enter,
        simba_bus_exit,
        0,
        i_ddi_intr_ops
};

static int simba_open(dev_t *devp, int flags, int otyp, cred_t *credp);
static int simba_close(dev_t dev, int flags, int otyp, cred_t *credp);
static int simba_ioctl(dev_t dev, int cmd, intptr_t arg, int mode,
    cred_t *credp, int *rvalp);

static struct cb_ops simba_cb_ops = {
        simba_open,                     /* open */
        simba_close,                    /* close */
        nulldev,                        /* strategy */
        nulldev,                        /* print */
        nulldev,                        /* dump */
        nulldev,                        /* read */
        nulldev,                        /* write */
        simba_ioctl,                    /* ioctl */
        nodev,                          /* devmap */
        nodev,                          /* mmap */
        nodev,                          /* segmap */
        nochpoll,                       /* poll */
        ddi_prop_op,                    /* cb_prop_op */
        NULL,                           /* streamtab */
        D_NEW | D_MP | D_HOTPLUG,       /* Driver compatibility flag */
        CB_REV,                         /* rev */
        nodev,                          /* int (*cb_aread)() */
        nodev                           /* int (*cb_awrite)() */
};

static int simba_probe(dev_info_t *);
static int simba_attach(dev_info_t *devi, ddi_attach_cmd_t cmd);
static int simba_detach(dev_info_t *devi, ddi_detach_cmd_t cmd);
static int simba_info(dev_info_t *dip, ddi_info_cmd_t infocmd,
        void *arg, void **result);

struct dev_ops simba_ops = {
        DEVO_REV,               /* devo_rev */
        0,                      /* refcnt  */
        simba_info,             /* info */
        nulldev,                /* identify */
        simba_probe,            /* probe */
        simba_attach,           /* attach */
        simba_detach,           /* detach */
        nulldev,                /* reset */
        &simba_cb_ops,          /* driver operations */
        &simba_bus_ops,         /* bus operations */
        NULL,
        ddi_quiesce_not_supported,      /* devo_quiesce */
};

/*
 * Module linkage information for the kernel.
 */

static struct modldrv modldrv = {
        &mod_driverops, /* Type of module */
        "SIMBA PCI to PCI bridge nexus driver",
        &simba_ops,     /* driver ops */
};

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

/*
 * Simba specific error state structure
 */
struct simba_errstate {
        char *error;
        ushort_t pci_cfg_stat;
        ushort_t pci_cfg_sec_stat;
        uint64_t afsr;
        uint64_t afar;
        int bridge_secondary;
};

struct simba_cfg_state {
        dev_info_t *dip;
        ushort_t command;
        uchar_t cache_line_size;
        uchar_t latency_timer;
        uchar_t header_type;
        uchar_t bus_number;
        uchar_t sec_bus_number;
        uchar_t sub_bus_number;
        uchar_t sec_latency_timer;
        ushort_t bridge_control;
};

/*
 * soft state pointer and structure template:
 */
static void *simba_state;

typedef struct {

        dev_info_t *dip;

        /*
         * configuration register state for the bus:
         */
        ddi_acc_handle_t config_handle;
        uchar_t simba_cache_line_size;
        uchar_t simba_latency_timer;

        /*
         * cpr support:
         */
        uint_t config_state_index;
        struct simba_cfg_state *simba_config_state_p;
        ddi_iblock_cookie_t fm_ibc;
        int fm_cap;
        kmutex_t simba_mutex;
        uint_t simba_soft_state;
#define SIMBA_SOFT_STATE_CLOSED         0x00
#define SIMBA_SOFT_STATE_OPEN           0x01
#define SIMBA_SOFT_STATE_OPEN_EXCL      0x02
} simba_devstate_t;

/*
 * The following variable enables a workaround for the following obp bug:
 *
 *      1234181 - obp should set latency timer registers in pci
 *              configuration header
 *
 * Until this bug gets fixed in the obp, the following workaround should
 * be enabled.
 */
static uint_t simba_set_latency_timer_register = 1;

/*
 * The following variable enables a workaround for an obp bug to be
 * submitted.  A bug requesting a workaround fof this problem has
 * been filed:
 *
 *      1235094 - need workarounds on positron nexus drivers to set cache
 *              line size registers
 *
 * Until this bug gets fixed in the obp, the following workaround should
 * be enabled.
 */
static uint_t simba_set_cache_line_size_register = 1;


/*
 * forward function declarations:
 */
static void simba_uninitchild(dev_info_t *);
static int simba_initchild(dev_info_t *child);
static void simba_save_config_regs(simba_devstate_t *simba_p);
static void simba_restore_config_regs(simba_devstate_t *simba_p);
static int simba_err_callback(dev_info_t *dip, ddi_fm_error_t *derr,
                const void *impl_data);

int
_init(void)
{
        int e;

        DEBUG0(D_ATTACH, "_init() installing module...\n");
        if ((e = ddi_soft_state_init(&simba_state, sizeof (simba_devstate_t),
            1)) == 0 && (e = mod_install(&modlinkage)) != 0)
                ddi_soft_state_fini(&simba_state);

        DEBUG0(D_ATTACH, "_init() module installed\n");
        return (e);
}

int
_fini(void)
{
        int e;
        DEBUG0(D_ATTACH, "_fini() removing module...\n");
        if ((e = mod_remove(&modlinkage)) == 0)
                ddi_soft_state_fini(&simba_state);
        return (e);
}

int
_info(struct modinfo *modinfop)
{
        DEBUG0(D_ATTACH, "_info() called.\n");
        return (mod_info(&modlinkage, modinfop));
}

/*ARGSUSED*/
static int
simba_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
        simba_devstate_t *simba_p;      /* per simba state pointer */
        int instance;

        instance = getminor((dev_t)arg);
        simba_p = (simba_devstate_t *)ddi_get_soft_state(simba_state,
            instance);

        switch (infocmd) {
        default:
                return (DDI_FAILURE);

        case DDI_INFO_DEVT2INSTANCE:
                *result = (void *)(uintptr_t)instance;
                return (DDI_SUCCESS);

        case DDI_INFO_DEVT2DEVINFO:
                if (simba_p == NULL)
                        return (DDI_FAILURE);
                *result = (void *)simba_p->dip;
                return (DDI_SUCCESS);
        }
}

/*ARGSUSED*/
static int
simba_probe(register dev_info_t *devi)
{
        DEBUG0(D_ATTACH, "simba_probe() called.\n");
        return (DDI_PROBE_SUCCESS);
}

/*ARGSUSED*/
static int
simba_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
        int instance;
        simba_devstate_t *simba;

        switch (cmd) {
        case DDI_ATTACH:

                DEBUG1(D_ATTACH, "attach(%p) ATTACH\n", devi);

                /*
                 * Make sure the "device_type" property exists.
                 */
                (void) ddi_prop_update_string(DDI_DEV_T_NONE, devi,
                    "device_type", "pci");

                /*
                 * Allocate and get soft state structure.
                 */
                instance = ddi_get_instance(devi);
                if (ddi_soft_state_zalloc(simba_state, instance) != DDI_SUCCESS)
                        return (DDI_FAILURE);
                simba = (simba_devstate_t *)ddi_get_soft_state(simba_state,
                    instance);
                simba->dip = devi;
                mutex_init(&simba->simba_mutex, NULL, MUTEX_DRIVER, NULL);
                simba->simba_soft_state = SIMBA_SOFT_STATE_CLOSED;

                /*
                 * create minor node for devctl interfaces
                 */
                if (ddi_create_minor_node(devi, "devctl", S_IFCHR, instance,
                    DDI_NT_NEXUS, 0) != DDI_SUCCESS) {
                        mutex_destroy(&simba->simba_mutex);
                        ddi_soft_state_free(simba_state, instance);
                        return (DDI_FAILURE);
                }

                if (pci_config_setup(devi, &simba->config_handle) !=
                    DDI_SUCCESS) {
                        ddi_remove_minor_node(devi, "devctl");
                        mutex_destroy(&simba->simba_mutex);
                        ddi_soft_state_free(simba_state, instance);
                        return (DDI_FAILURE);
                }

                /*
                 * Simba cache line size is 64 bytes and hardwired.
                 */
                simba->simba_cache_line_size =
                    pci_config_get8(simba->config_handle,
                    PCI_CONF_CACHE_LINESZ);
                simba->simba_latency_timer =
                    pci_config_get8(simba->config_handle,
                    PCI_CONF_LATENCY_TIMER);

                /* simba specific, clears up the pri/sec status registers */
                pci_config_put16(simba->config_handle, 0x6, 0xffff);
                pci_config_put16(simba->config_handle, 0x1e, 0xffff);

                DEBUG2(D_ATTACH, "simba_attach(): clsz=%x, lt=%x\n",
                    simba->simba_cache_line_size,
                    simba->simba_latency_timer);

                /*
                 * Initialize FMA support
                 */
                simba->fm_cap = DDI_FM_EREPORT_CAPABLE | DDI_FM_ERRCB_CAPABLE |
                    DDI_FM_ACCCHK_CAPABLE | DDI_FM_DMACHK_CAPABLE;

                /*
                 * Call parent to get it's capablity
                 */
                ddi_fm_init(devi, &simba->fm_cap, &simba->fm_ibc);

                ASSERT((simba->fm_cap & DDI_FM_ERRCB_CAPABLE) &&
                    (simba->fm_cap & DDI_FM_EREPORT_CAPABLE));

                pci_ereport_setup(devi);

                ddi_fm_handler_register(devi, simba_err_callback, simba);

                ddi_report_dev(devi);
                DEBUG0(D_ATTACH, "attach(): ATTACH done\n");
                return (DDI_SUCCESS);

        case DDI_RESUME:

                /*
                 * Get the soft state structure for the bridge.
                 */
                simba = (simba_devstate_t *)
                    ddi_get_soft_state(simba_state, ddi_get_instance(devi));
                simba_restore_config_regs(simba);
                return (DDI_SUCCESS);
        }
        return (DDI_FAILURE);
}

/*ARGSUSED*/
static int
simba_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
        simba_devstate_t *simba;
        simba = (simba_devstate_t *)
            ddi_get_soft_state(simba_state, ddi_get_instance(devi));

        switch (cmd) {
        case DDI_DETACH:
                DEBUG0(D_DETACH, "detach() called\n");
                ddi_fm_handler_unregister(devi);
                pci_ereport_teardown(devi);
                ddi_fm_fini(devi);
                pci_config_teardown(&simba->config_handle);
                (void) ddi_prop_remove(DDI_DEV_T_NONE, devi, "device_type");
                ddi_remove_minor_node(devi, "devctl");
                mutex_destroy(&simba->simba_mutex);
                ddi_soft_state_free(simba_state, ddi_get_instance(devi));
                return (DDI_SUCCESS);

        case DDI_SUSPEND:
                simba_save_config_regs(simba);
                return (DDI_SUCCESS);
        }
        return (DDI_FAILURE);
}

/*ARGSUSED*/
static int
simba_bus_map(dev_info_t *dip, dev_info_t *rdip, ddi_map_req_t *mp,
        off_t offset, off_t len, caddr_t *vaddrp)
{
        register dev_info_t *pdip;

        DEBUG3(D_MAP, "simba_bus_map(): dip=%p, rdip=%p, mp=%p", dip, rdip, mp);
        DEBUG3(D_MAP, "simba_bus_map(): offset=%lx, len=%lx, vaddrp=%p",
            offset, len, vaddrp);

        pdip = (dev_info_t *)DEVI(dip)->devi_parent;
        return ((DEVI(pdip)->devi_ops->devo_bus_ops->bus_map)
            (pdip, rdip, mp, offset, len, vaddrp));
}

/*
 * Registered error handling callback with our parent
 */
static int
simba_err_callback(dev_info_t *dip, ddi_fm_error_t *derr, const void *impl_data)
{
        simba_devstate_t *simba = (simba_devstate_t *)impl_data;
        struct simba_errstate simba_err;
        int ret = 0;

        bzero(&simba_err, sizeof (struct simba_errstate));
        simba_err.afsr = pci_config_get64(simba->config_handle, 0xe8);
        simba_err.afar = pci_config_get64(simba->config_handle, 0xf0);
        derr->fme_ena = fm_ena_generate(0, FM_ENA_FMT1);

        pci_ereport_post(dip, derr, NULL);
        ret = derr->fme_status;

        DEBUG6(D_FAULT, "%s-%d: cleaning up fault bits %x %x %x.%8x\n",
            ddi_driver_name(simba->dip), ddi_get_instance(simba->dip),
            simba_err.pci_cfg_stat, simba_err.pci_cfg_sec_stat,
            (uint_t)(simba_err.afsr >> 32), (uint_t)simba_err.afsr);
        pci_config_put64(simba->config_handle, 0xe8, simba_err.afsr);

        return (ret);
}

#if defined(DEBUG) && !defined(lint)
static char *ops[] =
{
        "DDI_CTLOPS_DMAPMAPC",
        "DDI_CTLOPS_INITCHILD",
        "DDI_CTLOPS_UNINITCHILD",
        "DDI_CTLOPS_REPORTDEV",
        "DDI_CTLOPS_REPORTINT",
        "DDI_CTLOPS_REGSIZE",
        "DDI_CTLOPS_NREGS",
        "DDI_CTLOPS_RESERVED0",
        "DDI_CTLOPS_SIDDEV",
        "DDI_CTLOPS_SLAVEONLY",
        "DDI_CTLOPS_AFFINITY",
        "DDI_CTLOPS_IOMIN",
        "DDI_CTLOPS_PTOB",
        "DDI_CTLOPS_BTOP",
        "DDI_CTLOPS_BTOPR",
        "DDI_CTLOPS_RESERVED1",
        "DDI_CTLOPS_RESERVED2",
        "DDI_CTLOPS_RESERVED3",
        "DDI_CTLOPS_RESERVED4",
        "DDI_CTLOPS_RESERVED5",
        "DDI_CTLOPS_DVMAPAGESIZE",
        "DDI_CTLOPS_POWER",
        "DDI_CTLOPS_ATTACH",
        "DDI_CTLOPS_DETACH",
        "DDI_CTLOPS_POKE",
        "DDI_CTLOPS_PEEK"
};
#endif

/*ARGSUSED*/
static int
simba_ctlops(dev_info_t *dip, dev_info_t *rdip, ddi_ctl_enum_t ctlop,
        void *arg, void *result)
{
        int reglen;
        int rn;
        int totreg;
        pci_regspec_t *drv_regp;

        DEBUG6(D_CTLOPS,
            "simba_ctlops(): dip=%p rdip=%p ctlop=%x-%s arg=%p result=%p",
            dip, rdip, ctlop, ctlop < (sizeof (ops) / sizeof (ops[0])) ?
            ops[ctlop] : "Unknown", arg, result);

        switch (ctlop) {
        case DDI_CTLOPS_REPORTDEV:
                if (rdip == (dev_info_t *)0)
                        return (DDI_FAILURE);
                cmn_err(CE_CONT, "?PCI-device: %s@%s, %s%d\n",
                    ddi_node_name(rdip), ddi_get_name_addr(rdip),
                    ddi_driver_name(rdip),
                    ddi_get_instance(rdip));
                return (DDI_SUCCESS);

        case DDI_CTLOPS_INITCHILD:
                return (simba_initchild((dev_info_t *)arg));

        case DDI_CTLOPS_UNINITCHILD:
                simba_uninitchild((dev_info_t *)arg);
                return (DDI_SUCCESS);

        case DDI_CTLOPS_SIDDEV:
                return (DDI_SUCCESS);

        case DDI_CTLOPS_REGSIZE:
        case DDI_CTLOPS_NREGS:
                if (rdip == (dev_info_t *)0)
                        return (DDI_FAILURE);
                break;

        default:
                DEBUG0(D_CTLOPS, "simba_ctlops(): calling ddi_ctlops()");
                return (ddi_ctlops(dip, rdip, ctlop, arg, result));
        }

        *(int *)result = 0;
        if (ddi_getlongprop(DDI_DEV_T_ANY, rdip,
            DDI_PROP_DONTPASS | DDI_PROP_CANSLEEP, "reg",
            (caddr_t)&drv_regp, &reglen) != DDI_SUCCESS)
                return (DDI_FAILURE);

        totreg = reglen / sizeof (pci_regspec_t);
        if (ctlop == DDI_CTLOPS_NREGS)
                *(int *)result = totreg;
        else if (ctlop == DDI_CTLOPS_REGSIZE) {
                rn = *(int *)arg;
                if (rn >= totreg) {
                        kmem_free(drv_regp, reglen);
                        return (DDI_FAILURE);
                }
                *(off_t *)result = drv_regp[rn].pci_size_low |
                    ((uint64_t)drv_regp[rn].pci_size_hi << 32);
        }

        kmem_free(drv_regp, reglen);
        DEBUG1(D_CTLOPS, "simba_ctlops(): *result=%lx\n", *(off_t *)result);
        return (DDI_SUCCESS);
}

static int
simba_name_child(dev_info_t *child, char *name, int namelen)
{
        uint_t n, slot, func;
        pci_regspec_t *pci_rp;

        if (ndi_dev_is_persistent_node(child) == 0) {
                char **unit_addr;

                /* name .conf nodes by "unit-address" property" */
                if (ddi_prop_lookup_string_array(DDI_DEV_T_ANY, child,
                    DDI_PROP_DONTPASS, "unit-address", &unit_addr, &n) !=
                    DDI_PROP_SUCCESS) {
                        cmn_err(CE_WARN, "cannot name node from %s.conf",
                            ddi_driver_name(child));
                        return (DDI_FAILURE);
                }
                if (n != 1 || *unit_addr == NULL || **unit_addr == 0) {
                        cmn_err(CE_WARN, "unit-address property in %s.conf"
                            " not well-formed", ddi_driver_name(child));
                        ddi_prop_free(unit_addr);
                        return (DDI_FAILURE);
                }

                (void) snprintf(name, namelen, "%s", *unit_addr);
                ddi_prop_free(unit_addr);
                return (DDI_SUCCESS);
        }

        /* name hardware nodes by "reg" property */
        if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, child, 0, "reg",
            (int **)&pci_rp, &n) != DDI_SUCCESS)
                return (DDI_FAILURE);

        /* get the device identifications */
        slot = PCI_REG_DEV_G(pci_rp->pci_phys_hi);
        func = PCI_REG_FUNC_G(pci_rp->pci_phys_hi);

        if (func != 0)
                (void) snprintf(name, namelen, "%x,%x", slot, func);
        else
                (void) snprintf(name, namelen, "%x", slot);

        ddi_prop_free(pci_rp);
        return (DDI_SUCCESS);
}

static int
simba_initchild(dev_info_t *child)
{
        char name[MAXNAMELEN];
        int i;
        ddi_acc_handle_t config_handle;
        ushort_t command_preserve, command;
        uchar_t header_type;
        uchar_t min_gnt, latency_timer;
        simba_devstate_t *simba;
        uint_t n;

        DEBUG1(D_INIT_CLD, "simba_initchild(): child=%p\n", child);

        /*
         * Pseudo nodes indicate a prototype node with per-instance
         * properties to be merged into the real h/w device node.
         * The interpretation of the unit-address is DD[,F]
         * where DD is the device id and F is the function.
         */
        if (ndi_dev_is_persistent_node(child) == 0) {
                extern int pci_allow_pseudo_children;
                pci_regspec_t *pci_rp;

                if (ddi_getlongprop(DDI_DEV_T_ANY, child,
                    DDI_PROP_DONTPASS, "reg", (caddr_t)&pci_rp, &i) ==
                    DDI_SUCCESS) {
                        cmn_err(CE_WARN,
                            "cannot merge prototype from %s.conf",
                            ddi_driver_name(child));
                        kmem_free(pci_rp, i);
                        return (DDI_NOT_WELL_FORMED);
                }

                if (simba_name_child(child, name, MAXNAMELEN) != DDI_SUCCESS)
                        return (DDI_NOT_WELL_FORMED);

                ddi_set_name_addr(child, name);
                ddi_set_parent_data(child, NULL);

                /*
                 * Try to merge the properties from this prototype
                 * node into real h/w nodes.
                 */
                if (ndi_merge_node(child, simba_name_child) == DDI_SUCCESS) {
                        /*
                         * Merged ok - return failure to remove the node.
                         */
                        simba_uninitchild(child);
                        return (DDI_FAILURE);
                }

                /* workaround for ddivs to run under PCI */
                if (pci_allow_pseudo_children)
                        return (DDI_SUCCESS);

                /*
                 * The child was not merged into a h/w node,
                 * but there's not much we can do with it other
                 * than return failure to cause the node to be removed.
                 */
                cmn_err(CE_WARN, "!%s@%s: %s.conf properties not merged",
                    ddi_driver_name(child), ddi_get_name_addr(child),
                    ddi_driver_name(child));
                simba_uninitchild(child);
                return (DDI_NOT_WELL_FORMED);
        }

        /*
         * Initialize real h/w nodes
         */
        if (simba_name_child(child, name, MAXNAMELEN) != DDI_SUCCESS)
                return (DDI_FAILURE);

        ddi_set_name_addr(child, name);
        ddi_set_parent_data(child, NULL);

        if (pci_config_setup(child, &config_handle) != DDI_SUCCESS) {
                simba_uninitchild(child);
                return (DDI_FAILURE);
        }

        DEBUG0(D_INIT_CLD, "simba_initchild(): pci_config_setup success!\n");

        /*
         * Determine the configuration header type.
         */
        header_type = pci_config_get8(config_handle, PCI_CONF_HEADER);

        /*
         * Support for the "command-preserve" property.
         */
        command_preserve = ddi_prop_get_int(DDI_DEV_T_ANY, child,
            DDI_PROP_DONTPASS, "command-preserve", 0);
        command = pci_config_get16(config_handle, PCI_CONF_COMM);
        command &= (command_preserve | PCI_COMM_BACK2BACK_ENAB);
        command |= (simba_command_default & ~command_preserve);
        pci_config_put16(config_handle, PCI_CONF_COMM, command);

        /* clean up all PCI child devices status register */
        pci_config_put16(config_handle, PCI_CONF_STAT, 0xffff);

        /*
         * If the device has a primary bus control register then program it
         * based on the settings in the command register.
         */
        if ((header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE) {
                ushort_t bcr =
                    pci_config_get16(config_handle, PCI_BCNF_BCNTRL);
                if (simba_command_default & PCI_COMM_PARITY_DETECT)
                        bcr |= PCI_BCNF_BCNTRL_PARITY_ENABLE;
                if (simba_command_default & PCI_COMM_SERR_ENABLE)
                        bcr |= PCI_BCNF_BCNTRL_SERR_ENABLE;
                bcr |= PCI_BCNF_BCNTRL_MAST_AB_MODE;
                pci_config_put8(config_handle, PCI_BCNF_BCNTRL, bcr);
        }

        simba = (simba_devstate_t *)ddi_get_soft_state(simba_state,
            ddi_get_instance(ddi_get_parent(child)));
        /*
         * Initialize cache-line-size configuration register if needed.
         */
        if (simba_set_cache_line_size_register &&
            ddi_getprop(DDI_DEV_T_ANY, child, DDI_PROP_DONTPASS,
            "cache-line-size", 0) == 0) {
                pci_config_put8(config_handle, PCI_CONF_CACHE_LINESZ,
                    simba->simba_cache_line_size);
                n = pci_config_get8(config_handle, PCI_CONF_CACHE_LINESZ);
                if (n != 0)
                        (void) ndi_prop_update_int(DDI_DEV_T_NONE, child,
                            "cache-line-size", n);
        }

        /*
         * Initialize latency timer configuration registers if needed.
         */
        if (simba_set_latency_timer_register &&
            ddi_getprop(DDI_DEV_T_ANY, child, DDI_PROP_DONTPASS,
            "latency-timer", 0) == 0) {

                if ((header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE) {
                        latency_timer = simba->simba_latency_timer;
                        pci_config_put8(config_handle, PCI_BCNF_LATENCY_TIMER,
                            simba->simba_latency_timer);
                } else {
                        min_gnt = pci_config_get8(config_handle,
                            PCI_CONF_MIN_G);
                        latency_timer = min_gnt * 8;
                }
                pci_config_put8(config_handle, PCI_CONF_LATENCY_TIMER,
                    latency_timer);
                n = pci_config_get8(config_handle, PCI_CONF_LATENCY_TIMER);
                if (n != 0)
                        (void) ndi_prop_update_int(DDI_DEV_T_NONE, child,
                            "latency-timer", n);
        }

        pci_config_teardown(&config_handle);
        DEBUG0(D_INIT_CLD, "simba_initchild(): pci_config_teardown called\n");
        return (DDI_SUCCESS);
}

static void
simba_uninitchild(dev_info_t *dip)
{
        ddi_set_name_addr(dip, NULL);

        /*
         * Strip the node to properly convert it back to prototype form
         */
        impl_rem_dev_props(dip);
}

/*
 * simba_save_config_regs
 *
 * This routine saves the state of the configuration registers of all
 * the child nodes of each PBM.
 *
 * used by: simba_detach() on suspends
 *
 * return value: none
 */
static void
simba_save_config_regs(simba_devstate_t *simba_p)
{
        int i;
        dev_info_t *dip;
        ddi_acc_handle_t ch;
        struct simba_cfg_state *statep;

        for (i = 0, dip = ddi_get_child(simba_p->dip); dip != NULL;
            dip = ddi_get_next_sibling(dip)) {
                if (i_ddi_devi_attached(dip))
                        i++;
        }
        if (!i)
                return;
        simba_p->simba_config_state_p =
            kmem_zalloc(i * sizeof (struct simba_cfg_state), KM_NOSLEEP);
        if (!simba_p->simba_config_state_p) {
                cmn_err(CE_WARN, "not enough memrory to save simba child\n");
                return;
        }
        simba_p->config_state_index = i;

        for (statep = simba_p->simba_config_state_p,
            dip = ddi_get_child(simba_p->dip);
            dip != NULL;
            dip = ddi_get_next_sibling(dip)) {

                if (!i_ddi_devi_attached(dip)) {
                        DEBUG4(D_DETACH, "%s%d: skipping unattached %s%d\n",
                            ddi_driver_name(simba_p->dip),
                            ddi_get_instance(simba_p->dip),
                            ddi_driver_name(dip),
                            ddi_get_instance(dip));
                        continue;
                }

                DEBUG4(D_DETACH, "%s%d: saving regs for %s%d\n",
                    ddi_driver_name(simba_p->dip),
                    ddi_get_instance(simba_p->dip),
                    ddi_driver_name(dip),
                    ddi_get_instance(dip));

                if (pci_config_setup(dip, &ch) != DDI_SUCCESS) {
                        DEBUG4(D_DETACH, "%s%d: can't config space for %s%d\n",
                            ddi_driver_name(simba_p->dip),
                            ddi_get_instance(simba_p->dip),
                            ddi_driver_name(dip),
                            ddi_get_instance(dip));
                        continue;
                }

                DEBUG3(D_DETACH, "%s%d: saving child dip=%p\n",
                    ddi_driver_name(simba_p->dip),
                    ddi_get_instance(simba_p->dip),
                    dip);

                statep->dip = dip;
                statep->command = pci_config_get16(ch, PCI_CONF_COMM);
                statep->header_type = pci_config_get8(ch, PCI_CONF_HEADER);
                if ((statep->header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE)
                        statep->bridge_control =
                            pci_config_get16(ch, PCI_BCNF_BCNTRL);
                statep->cache_line_size =
                    pci_config_get8(ch, PCI_CONF_CACHE_LINESZ);
                statep->latency_timer =
                    pci_config_get8(ch, PCI_CONF_LATENCY_TIMER);
                if ((statep->header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE)
                        statep->sec_latency_timer =
                            pci_config_get8(ch, PCI_BCNF_LATENCY_TIMER);
                /*
                 * Simba specific.
                 */
                if (pci_config_get16(ch, PCI_CONF_VENID) == PCI_SIMBA_VENID &&
                    pci_config_get16(ch, PCI_CONF_DEVID) == PCI_SIMBA_DEVID) {

                        statep->bus_number =
                            pci_config_get8(ch, PCI_BCNF_PRIBUS);
                        statep->sec_bus_number =
                            pci_config_get8(ch, PCI_BCNF_SECBUS);
                        statep->sub_bus_number =
                            pci_config_get8(ch, PCI_BCNF_SUBBUS);
                        statep->bridge_control =
                            pci_config_get16(ch, PCI_BCNF_BCNTRL);
                }
                pci_config_teardown(&ch);
                statep++;
        }
}


/*
 * simba_restore_config_regs
 *
 * This routine restores the state of the configuration registers of all
 * the child nodes of each PBM.
 *
 * used by: simba_attach() on resume
 *
 * return value: none
 */
static void
simba_restore_config_regs(simba_devstate_t *simba_p)
{
        int i;
        dev_info_t *dip;
        ddi_acc_handle_t ch;
        struct simba_cfg_state *statep = simba_p->simba_config_state_p;
        if (!simba_p->config_state_index)
                return;

        for (i = 0; i < simba_p->config_state_index; i++, statep++) {
                dip = statep->dip;
                if (!dip) {
                        cmn_err(CE_WARN,
                            "%s%d: skipping bad dev info (%d)\n",
                            ddi_driver_name(simba_p->dip),
                            ddi_get_instance(simba_p->dip),
                            i);
                        continue;
                }

                DEBUG5(D_ATTACH, "%s%d: restoring regs for %p-%s%d\n",
                    ddi_driver_name(simba_p->dip),
                    ddi_get_instance(simba_p->dip),
                    dip,
                    ddi_driver_name(dip),
                    ddi_get_instance(dip));

                if (pci_config_setup(dip, &ch) != DDI_SUCCESS) {
                        DEBUG4(D_ATTACH, "%s%d: can't config space for %s%d\n",
                            ddi_driver_name(simba_p->dip),
                            ddi_get_instance(simba_p->dip),
                            ddi_driver_name(dip),
                            ddi_get_instance(dip));
                        continue;
                }
                pci_config_put16(ch, PCI_CONF_COMM, statep->command);
                if ((statep->header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE)
                        pci_config_put16(ch, PCI_BCNF_BCNTRL,
                            statep->bridge_control);
                /*
                 * Simba specific.
                 */
                if (pci_config_get16(ch, PCI_CONF_VENID) == PCI_SIMBA_VENID &&
                    pci_config_get16(ch, PCI_CONF_DEVID) == PCI_SIMBA_DEVID) {
                        pci_config_put8(ch, PCI_BCNF_PRIBUS,
                            statep->bus_number);
                        pci_config_put8(ch, PCI_BCNF_SECBUS,
                            statep->sec_bus_number);
                        pci_config_put8(ch, PCI_BCNF_SUBBUS,
                            statep->sub_bus_number);
                        pci_config_put16(ch, PCI_BCNF_BCNTRL,
                            statep->bridge_control);
                }

                pci_config_put8(ch, PCI_CONF_CACHE_LINESZ,
                    statep->cache_line_size);
                pci_config_put8(ch, PCI_CONF_LATENCY_TIMER,
                    statep->latency_timer);
                if ((statep->header_type & PCI_HEADER_TYPE_M) == PCI_HEADER_ONE)
                        pci_config_put8(ch, PCI_BCNF_LATENCY_TIMER,
                            statep->sec_latency_timer);
                pci_config_teardown(&ch);
        }

        kmem_free(simba_p->simba_config_state_p,
            simba_p->config_state_index * sizeof (struct simba_cfg_state));
        simba_p->simba_config_state_p = NULL;
        simba_p->config_state_index = 0;
}

/* ARGSUSED */
static int
simba_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
        simba_devstate_t *simba_p;

        /*
         * Make sure the open is for the right file type.
         */
        if (otyp != OTYP_CHR)
                return (EINVAL);

        /*
         * Get the soft state structure for the device.
         */
        simba_p = (simba_devstate_t *)ddi_get_soft_state(simba_state,
            getminor(*devp));
        if (simba_p == NULL)
                return (ENXIO);

        /*
         * Handle the open by tracking the device state.
         */
        mutex_enter(&simba_p->simba_mutex);
        if (flags & FEXCL) {
                if (simba_p->simba_soft_state != SIMBA_SOFT_STATE_CLOSED) {
                        mutex_exit(&simba_p->simba_mutex);
                        return (EBUSY);
                }
                simba_p->simba_soft_state = SIMBA_SOFT_STATE_OPEN_EXCL;
        } else {
                if (simba_p->simba_soft_state == SIMBA_SOFT_STATE_OPEN_EXCL) {
                        mutex_exit(&simba_p->simba_mutex);
                        return (EBUSY);
                }
                simba_p->simba_soft_state = SIMBA_SOFT_STATE_OPEN;
        }
        mutex_exit(&simba_p->simba_mutex);
        return (0);
}


/* ARGSUSED */
static int
simba_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
        simba_devstate_t *simba_p;

        if (otyp != OTYP_CHR)
                return (EINVAL);

        simba_p = (simba_devstate_t *)ddi_get_soft_state(simba_state,
            getminor(dev));
        if (simba_p == NULL)
                return (ENXIO);

        mutex_enter(&simba_p->simba_mutex);
        simba_p->simba_soft_state = SIMBA_SOFT_STATE_CLOSED;
        mutex_exit(&simba_p->simba_mutex);
        return (0);
}


/*
 * simba_ioctl: devctl hotplug controls
 */
/* ARGSUSED */
static int
simba_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp,
        int *rvalp)
{
        simba_devstate_t *simba_p;
        dev_info_t *self;
        struct devctl_iocdata *dcp;
        uint_t bus_state;
        int rv = 0;

        simba_p = (simba_devstate_t *)ddi_get_soft_state(simba_state,
            getminor(dev));
        if (simba_p == NULL)
                return (ENXIO);

        self = simba_p->dip;

        /*
         * We can use the generic implementation for these ioctls
         */
        switch (cmd) {
        case DEVCTL_DEVICE_GETSTATE:
        case DEVCTL_DEVICE_ONLINE:
        case DEVCTL_DEVICE_OFFLINE:
        case DEVCTL_BUS_GETSTATE:
                return (ndi_devctl_ioctl(self, cmd, arg, mode, 0));
        }

        /*
         * read devctl ioctl data
         */
        if (ndi_dc_allochdl((void *)arg, &dcp) != NDI_SUCCESS)
                return (EFAULT);

        switch (cmd) {

        case DEVCTL_DEVICE_RESET:
                rv = ENOTSUP;
                break;


        case DEVCTL_BUS_QUIESCE:
                if (ndi_get_bus_state(self, &bus_state) == NDI_SUCCESS)
                        if (bus_state == BUS_QUIESCED)
                                break;
                (void) ndi_set_bus_state(self, BUS_QUIESCED);
                break;

        case DEVCTL_BUS_UNQUIESCE:
                if (ndi_get_bus_state(self, &bus_state) == NDI_SUCCESS)
                        if (bus_state == BUS_ACTIVE)
                                break;
                (void) ndi_set_bus_state(self, BUS_ACTIVE);
                break;

        case DEVCTL_BUS_RESET:
                rv = ENOTSUP;
                break;

        case DEVCTL_BUS_RESETALL:
                rv = ENOTSUP;
                break;

        default:
                rv = ENOTTY;
        }

        ndi_dc_freehdl(dcp);
        return (rv);
}

/*
 * Initialize FMA resources for children devices. Called when
 * child calls ddi_fm_init().
 */
/*ARGSUSED*/
static int
simba_fm_init_child(dev_info_t *dip, dev_info_t *tdip, int cap,
                ddi_iblock_cookie_t *ibc)
{
        simba_devstate_t *simba_p = ddi_get_soft_state(simba_state,
            ddi_get_instance(dip));

        *ibc = simba_p->fm_ibc;
        return (simba_p->fm_cap);
}

static void
simba_bus_enter(dev_info_t *dip, ddi_acc_handle_t handle)
{
        i_ndi_busop_access_enter(dip, handle);
}

/* ARGSUSED */
static void
simba_bus_exit(dev_info_t *dip, ddi_acc_handle_t handle)
{
        i_ndi_busop_access_exit(dip, handle);
}