/*
 * $NetBSD: puc.c,v 1.7 2000/07/29 17:43:38 jlam Exp $
 * $FreeBSD: src/sys/dev/puc/puc.c,v 1.3.2.5 2003/04/04 08:42:17 sobomax Exp $
 */

/*-
 * Copyright (c) 2002 JF Hay.  All rights reserved.
 * Copyright (c) 2000 M. Warner Losh.  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 unmodified, 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.
 */

/*
 * Copyright (c) 1996, 1998, 1999
 *      Christopher G. Demetriou.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * 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.
 */

/*
 * PCI "universal" communication card device driver, glues com, lpt,
 * and similar ports to PCI via bridge chip often much larger than
 * the devices being glued.
 *
 * Author: Christopher G. Demetriou, May 14, 1998 (derived from NetBSD
 * sys/dev/pci/pciide.c, revision 1.6).
 *
 * These devices could be (and some times are) described as
 * communications/{serial,parallel}, etc. devices with known
 * programming interfaces, but those programming interfaces (in
 * particular the BAR assignments for devices, etc.) in fact are not
 * particularly well defined.
 *
 * After I/we have seen more of these devices, it may be possible
 * to generalize some of these bits.  In particular, devices which
 * describe themselves as communications/serial/16[45]50, and
 * communications/parallel/??? might be attached via direct
 * 'com' and 'lpt' attachments to pci.
 */

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

#include <bus/pci/pcireg.h>
#include <bus/pci/pcivar.h>
#include "pucvar.h"

struct puc_softc {
        const struct puc_device_description *sc_desc;

        /* card-global dynamic data */
        int                     barmuxed;
        int                     irqrid;
        struct resource         *irqres;
        void                    *intr_cookie;
        int                     ilr_enabled;
        bus_space_tag_t         ilr_st;
        bus_space_handle_t      ilr_sh;

        struct {
                struct resource *res;
        } sc_bar_mappings[PUC_MAX_BAR];

        /* per-port dynamic data */
        struct {
                device_t        dev;
                /* filled in by bus_setup_intr() */
                void            (*ihand) (void *);
                void            *ihandarg;
        } sc_ports[PUC_MAX_PORTS];
};

struct puc_device {
        struct resource_list resources;
        u_int serialfreq;
};

static int puc_pci_probe(device_t dev);
static int puc_pci_attach(device_t dev);
static void puc_intr(void *arg);

static struct resource *puc_alloc_resource(device_t, device_t, int, int *,
    u_long, u_long, u_long, u_int, int);
static int puc_release_resource(device_t, device_t, int, int,
    struct resource *);
static int puc_get_resource(device_t, device_t, int, int, u_long *, u_long *);
static int puc_setup_intr(device_t, device_t, struct resource *, int,
    void (*)(void *), void *, void **, lwkt_serialize_t);
static int puc_teardown_intr(device_t, device_t, struct resource *,
    void *);
static int puc_read_ivar(device_t, device_t, int, uintptr_t *);

static const struct puc_device_description *puc_find_description(uint32_t,
    uint32_t, uint32_t, uint32_t);
static void puc_config_superio(device_t);
static void puc_config_win877(struct resource *);
static int puc_find_free_unit(char *);
#ifdef PUC_DEBUG
static void puc_print_win877(bus_space_tag_t, bus_space_handle_t, u_int,
    u_int);
static void puc_print_resource_list(struct resource_list *);
#endif

static int
puc_pci_probe(device_t dev)
{
        uint32_t v1, v2, d1, d2;
        const struct puc_device_description *desc;

        if ((pci_read_config(dev, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE) != 0)
                return (ENXIO);

        v1 = pci_read_config(dev, PCIR_VENDOR, 2);
        d1 = pci_read_config(dev, PCIR_DEVICE, 2);
        v2 = pci_read_config(dev, PCIR_SUBVEND_0, 2);
        d2 = pci_read_config(dev, PCIR_SUBDEV_0, 2);

        desc = puc_find_description(v1, d1, v2, d2);
        if (desc == NULL)
                return (ENXIO);
        device_set_desc(dev, desc->name);
        return (0);
}

static int
puc_probe_ilr(struct puc_softc *sc, struct resource *res)
{
        u_char t1, t2;
        int i;

        switch (sc->sc_desc->ilr_type) {
        case PUC_ILR_TYPE_DIGI:
                sc->ilr_st = rman_get_bustag(res);
                sc->ilr_sh = rman_get_bushandle(res);
                for (i = 0; i < 2; i++) {
                        t1 = bus_space_read_1(sc->ilr_st, sc->ilr_sh,
                            sc->sc_desc->ilr_offset[i]);
                        t1 = ~t1;
                        bus_space_write_1(sc->ilr_st, sc->ilr_sh,
                            sc->sc_desc->ilr_offset[i], t1);
                        t2 = bus_space_read_1(sc->ilr_st, sc->ilr_sh,
                            sc->sc_desc->ilr_offset[i]);
                        if (t2 == t1)
                                return (0);
                }
                return (1);

        default:
                break;
        }
        return (0);
}

static int
puc_pci_attach(device_t dev)
{
        char *typestr;
        int bidx, childunit, i, irq_setup, rid;
        uint32_t v1, v2, d1, d2;
        struct puc_softc *sc;
        struct puc_device *pdev;
        struct resource *res;
        struct resource_list_entry *rle;

        sc = (struct puc_softc *)device_get_softc(dev);
        bzero(sc, sizeof(*sc));
        v1 = pci_read_config(dev, PCIR_VENDOR, 2);
        d1 = pci_read_config(dev, PCIR_DEVICE, 2);
        v2 = pci_read_config(dev, PCIR_SUBVEND_0, 2);
        d2 = pci_read_config(dev, PCIR_SUBDEV_0, 2);
        sc->sc_desc = puc_find_description(v1, d1, v2, d2);
        if (sc->sc_desc == NULL)
                return (ENXIO);

#ifdef PUC_DEBUG
        bootverbose = 1;

        kprintf("puc: name: %s\n", sc->sc_desc->name);
#endif
        rid = 0;
        res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
            RF_ACTIVE | RF_SHAREABLE);
        if (!res)
                return (ENXIO);

        sc->irqres = res;
        sc->irqrid = rid;
        irq_setup = BUS_SETUP_INTR(device_get_parent(dev), dev, res,
                                   0, puc_intr, sc,
                                   &sc->intr_cookie, NULL, NULL);
        if (irq_setup != 0)
                return (ENXIO);

        rid = 0;
        for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
                if (rid == sc->sc_desc->ports[i].bar)
                        sc->barmuxed = 1;
                rid = sc->sc_desc->ports[i].bar;
                bidx = PUC_PORT_BAR_INDEX(rid);

                if (sc->sc_bar_mappings[bidx].res != NULL)
                        continue;
                res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
                    0ul, ~0ul, 1, RF_ACTIVE);
                if (res == NULL) {
                        kprintf("could not get resource\n");
                        continue;
                }
                sc->sc_bar_mappings[bidx].res = res;

                if (sc->sc_desc->ilr_type != PUC_ILR_TYPE_NONE) {
                        sc->ilr_enabled = puc_probe_ilr(sc, res);
                        if (sc->ilr_enabled)
                                device_printf(dev, "ILR enabled\n");
                        else
                                device_printf(dev, "ILR disabled\n");
                }
#ifdef PUC_DEBUG
                kprintf("port bst %x, start %x, end %x\n",
                    (u_int)rman_get_bustag(res), (u_int)rman_get_start(res),
                    (u_int)rman_get_end(res));
#endif
        }

        puc_config_superio(dev);

        for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
                rid = sc->sc_desc->ports[i].bar;
                bidx = PUC_PORT_BAR_INDEX(rid);
                if (sc->sc_bar_mappings[bidx].res == NULL)
                        continue;

                switch (sc->sc_desc->ports[i].type) {
                case PUC_PORT_TYPE_COM:
                        typestr = "sio";
                        break;
                default:
                        continue;
                }
                pdev = kmalloc(sizeof(struct puc_device), M_DEVBUF,
                                M_WAITOK | M_ZERO);
                resource_list_init(&pdev->resources);

                /* First fake up an IRQ resource. */
                resource_list_add(&pdev->resources, SYS_RES_IRQ, 0,
                    rman_get_start(sc->irqres), rman_get_end(sc->irqres),
                    rman_get_end(sc->irqres) - rman_get_start(sc->irqres) + 1,
                    rman_get_cpuid(sc->irqres));
                rle = resource_list_find(&pdev->resources, SYS_RES_IRQ, 0);
                rle->res = sc->irqres;

                /* Now fake an IOPORT resource */
                res = sc->sc_bar_mappings[bidx].res;
                resource_list_add(&pdev->resources, SYS_RES_IOPORT, 0,
                    rman_get_start(res) + sc->sc_desc->ports[i].offset,
                    rman_get_end(res) + sc->sc_desc->ports[i].offset + 8 - 1,
                    8, -1);
                rle = resource_list_find(&pdev->resources, SYS_RES_IOPORT, 0);

                if (sc->barmuxed == 0) {
                        rle->res = sc->sc_bar_mappings[bidx].res;
                } else {
                        rle->res = kmalloc(sizeof(struct resource), M_DEVBUF,
                            M_WAITOK | M_ZERO);

                        rle->res->r_start = rman_get_start(res) +
                            sc->sc_desc->ports[i].offset;
                        rle->res->r_end = rle->res->r_start + 8 - 1;
                        rle->res->r_bustag = rman_get_bustag(res);
                        bus_space_subregion(rle->res->r_bustag,
                            rman_get_bushandle(res),
                            sc->sc_desc->ports[i].offset, 8,
                            &rle->res->r_bushandle);
                }

                pdev->serialfreq = sc->sc_desc->ports[i].serialfreq;

                childunit = puc_find_free_unit(typestr);
                sc->sc_ports[i].dev = device_add_child(dev, typestr, childunit);
                if (sc->sc_ports[i].dev == NULL) {
                        if (sc->barmuxed) {
                                bus_space_unmap(rman_get_bustag(rle->res),
                                                rman_get_bushandle(rle->res),
                                                8);
                                kfree(rle->res, M_DEVBUF);
                                kfree(pdev, M_DEVBUF);
                        }
                        continue;
                }
                device_set_ivars(sc->sc_ports[i].dev, pdev);
                device_set_desc(sc->sc_ports[i].dev, sc->sc_desc->name);
                if (!bootverbose)
                        device_quiet(sc->sc_ports[i].dev);
#ifdef PUC_DEBUG
                kprintf("puc: type %d, bar %x, offset %x\n",
                    sc->sc_desc->ports[i].type,
                    sc->sc_desc->ports[i].bar,
                    sc->sc_desc->ports[i].offset);
                print_resource_list(&pdev->resources);
#endif
                device_set_flags(sc->sc_ports[i].dev,
                    sc->sc_desc->ports[i].flags);
                if (device_probe_and_attach(sc->sc_ports[i].dev) != 0) {
                        if (sc->barmuxed) {
                                bus_space_unmap(rman_get_bustag(rle->res),
                                                rman_get_bushandle(rle->res),
                                                8);
                                kfree(rle->res, M_DEVBUF);
                                kfree(pdev, M_DEVBUF);
                        }
                }
        }

#ifdef PUC_DEBUG
        bootverbose = 0;
#endif
        return (0);
}

static u_int32_t
puc_ilr_read(struct puc_softc *sc)
{
        u_int32_t mask;
        int i;

        mask = 0;
        switch (sc->sc_desc->ilr_type) {
        case PUC_ILR_TYPE_DIGI:
                for (i = 1; i >= 0; i--) {
                        mask = (mask << 8) | (bus_space_read_1(sc->ilr_st,
                            sc->ilr_sh, sc->sc_desc->ilr_offset[i]) & 0xff);
                }
                break;

        default:
                mask = 0xffffffff;
                break;
        }
        return (mask);
}

/*
 * This is an interrupt handler. For boards that can't tell us which
 * device generated the interrupt it just calls all the registered
 * handlers sequencially, but for boards that can tell us which
 * device(s) generated the interrupt it calls only handlers for devices
 * that actually generated the interrupt.
 */
static void
puc_intr(void *arg)
{
        int i;
        u_int32_t ilr_mask;
        struct puc_softc *sc;

        sc = (struct puc_softc *)arg;
        ilr_mask = sc->ilr_enabled ? puc_ilr_read(sc) : 0xffffffff;
        for (i = 0; i < PUC_MAX_PORTS; i++)
                if (sc->sc_ports[i].ihand != NULL &&
                    ((ilr_mask >> i) & 0x00000001))
                        (sc->sc_ports[i].ihand)(sc->sc_ports[i].ihandarg);
}

static const struct puc_device_description *
puc_find_description(uint32_t vend, uint32_t prod, uint32_t svend, 
    uint32_t sprod)
{
        int i;

#define checkreg(val, index) \
    (((val) & puc_devices[i].rmask[(index)]) == puc_devices[i].rval[(index)])

        for (i = 0; puc_devices[i].name != NULL; i++) {
                if (checkreg(vend, PUC_REG_VEND) &&
                    checkreg(prod, PUC_REG_PROD) &&
                    checkreg(svend, PUC_REG_SVEND) &&
                    checkreg(sprod, PUC_REG_SPROD))
                        return (&puc_devices[i]);
        }

#undef checkreg

        return (NULL);
}

/*
 * It might be possible to make these more generic if we can detect patterns.
 * For instance maybe if the size of a bar is 0x400 (the old isa space) it
 * might contain one or more superio chips.
 */
static void
puc_config_superio(device_t dev)
{
        struct puc_softc *sc = (struct puc_softc *)device_get_softc(dev);

        if (sc->sc_desc->rval[PUC_REG_VEND] == 0x1592 &&
            sc->sc_desc->rval[PUC_REG_PROD] == 0x0781)
                puc_config_win877(sc->sc_bar_mappings[0].res);
}

#define rdspio(indx)            (bus_space_write_1(bst, bsh, efir, indx), \
                                bus_space_read_1(bst, bsh, efdr))
#define wrspio(indx,data)       (bus_space_write_1(bst, bsh, efir, indx), \
                                bus_space_write_1(bst, bsh, efdr, data))

#ifdef PUC_DEBUG
static void
puc_print_win877(bus_space_tag_t bst, bus_space_handle_t bsh, u_int efir,
        u_int efdr)
{
        u_char cr00, cr01, cr04, cr09, cr0d, cr14, cr15, cr16, cr17;
        u_char cr18, cr19, cr24, cr25, cr28, cr2c, cr31, cr32;

        cr00 = rdspio(0x00);
        cr01 = rdspio(0x01);
        cr04 = rdspio(0x04);
        cr09 = rdspio(0x09);
        cr0d = rdspio(0x0d);
        cr14 = rdspio(0x14);
        cr15 = rdspio(0x15);
        cr16 = rdspio(0x16);
        cr17 = rdspio(0x17);
        cr18 = rdspio(0x18);
        cr19 = rdspio(0x19);
        cr24 = rdspio(0x24);
        cr25 = rdspio(0x25);
        cr28 = rdspio(0x28);
        cr2c = rdspio(0x2c);
        cr31 = rdspio(0x31);
        cr32 = rdspio(0x32);
        kprintf("877T: cr00 %x, cr01 %x, cr04 %x, cr09 %x, cr0d %x, cr14 %x, "
            "cr15 %x, cr16 %x, cr17 %x, cr18 %x, cr19 %x, cr24 %x, cr25 %x, "
            "cr28 %x, cr2c %x, cr31 %x, cr32 %x\n", cr00, cr01, cr04, cr09,
            cr0d, cr14, cr15, cr16, cr17,
            cr18, cr19, cr24, cr25, cr28, cr2c, cr31, cr32);
}
#endif

static void
puc_config_win877(struct resource *res)
{
        u_char val;
        u_int efir, efdr;
        bus_space_tag_t bst;
        bus_space_handle_t bsh;

        bst = rman_get_bustag(res);
        bsh = rman_get_bushandle(res);

        /* configure the first W83877TF */
        bus_space_write_1(bst, bsh, 0x250, 0x89);
        efir = 0x251;
        efdr = 0x252;
        val = rdspio(0x09) & 0x0f;
        if (val != 0x0c) {
                kprintf("conf_win877: Oops not a W83877TF\n");
                return;
        }

#ifdef PUC_DEBUG
        kprintf("before: ");
        puc_print_win877(bst, bsh, efir, efdr);
#endif

        val = rdspio(0x16);
        val |= 0x04;
        wrspio(0x16, val);
        val &= ~0x04;
        wrspio(0x16, val);

        wrspio(0x24, 0x2e8 >> 2);
        wrspio(0x25, 0x2f8 >> 2);
        wrspio(0x17, 0x03);
        wrspio(0x28, 0x43);

#ifdef PUC_DEBUG
        kprintf("after: ");
        puc_print_win877(bst, bsh, efir, efdr);
#endif

        bus_space_write_1(bst, bsh, 0x250, 0xaa);

        /* configure the second W83877TF */
        bus_space_write_1(bst, bsh, 0x3f0, 0x87);
        bus_space_write_1(bst, bsh, 0x3f0, 0x87);
        efir = 0x3f0;
        efdr = 0x3f1;
        val = rdspio(0x09) & 0x0f;
        if (val != 0x0c) {
                kprintf("conf_win877: Oops not a W83877TF\n");
                return;
        }

#ifdef PUC_DEBUG
        kprintf("before: ");
        puc_print_win877(bst, bsh, efir, efdr);
#endif

        val = rdspio(0x16);
        val |= 0x04;
        wrspio(0x16, val);
        val &= ~0x04;
        wrspio(0x16, val);

        wrspio(0x24, 0x3e8 >> 2);
        wrspio(0x25, 0x3f8 >> 2);
        wrspio(0x17, 0x03);
        wrspio(0x28, 0x43);

#ifdef PUC_DEBUG
        kprintf("after: ");
        puc_print_win877(bst, bsh, efir, efdr);
#endif

        bus_space_write_1(bst, bsh, 0x3f0, 0xaa);
}

#undef rdspio
#undef wrspio

static int puc_find_free_unit(char *name)
{
        devclass_t dc;
        int start;
        int unit;

        unit = 0;
        start = 0;
        while (resource_int_value(name, unit, "port", &start) == 0 && 
            start > 0)
                unit++;
        dc = devclass_find(name);
        if (dc == NULL)
                return (-1);
        while (devclass_get_device(dc, unit))
                unit++;
#ifdef PUC_DEBUG
        kprintf("puc: Using %s%d\n", name, unit);
#endif
        return (unit);
}

#ifdef PUC_DEBUG
static void
puc_print_resource_list(struct resource_list *rl)
{
        struct resource_list_entry *rle;

        kprintf("print_resource_list: rl %p\n", rl);
        SLIST_FOREACH(rle, rl, link)
                kprintf("type %x, rid %x\n", rle->type, rle->rid);
        kprintf("print_resource_list: end.\n");
}
#endif

static struct resource *
puc_alloc_resource(device_t dev, device_t child, int type, int *rid,
    u_long start, u_long end, u_long count, u_int flags, int cpuid __unused)
{
        struct puc_device *pdev;
        struct resource *retval;
        struct resource_list *rl;
        struct resource_list_entry *rle;

        pdev = device_get_ivars(child);
        rl = &pdev->resources;

#ifdef PUC_DEBUG
        kprintf("puc_alloc_resource: pdev %p, looking for t %x, r %x\n",
            pdev, type, *rid);
        puc_print_resource_list(rl);
#endif
        retval = NULL;
        rle = resource_list_find(rl, type, *rid);
        if (rle) {
                start = rle->start;
                end = rle->end;
                count = rle->count;
#ifdef PUC_DEBUG
                kprintf("found rle, %lx, %lx, %lx\n", start, end, count);
#endif
                retval = rle->res;
        } else
                kprintf("oops rle is gone\n");

        return (retval);
}

static int
puc_release_resource(device_t dev, device_t child, int type, int rid,
    struct resource *res)
{
        return (0);
}

static int
puc_get_resource(device_t dev, device_t child, int type, int rid,
    u_long *startp, u_long *countp)
{
        struct puc_device *pdev;
        struct resource_list *rl;
        struct resource_list_entry *rle;

        pdev = device_get_ivars(child);
        rl = &pdev->resources;

#ifdef PUC_DEBUG
        kprintf("puc_get_resource: pdev %p, looking for t %x, r %x\n", pdev,
            type, rid);
        puc_print_resource_list(rl);
#endif
        rle = resource_list_find(rl, type, rid);
        if (rle) {
#ifdef PUC_DEBUG
                kprintf("found rle %p,", rle);
#endif
                if (startp != NULL)
                        *startp = rle->start;
                if (countp != NULL)
                        *countp = rle->count;
#ifdef PUC_DEBUG
                kprintf(" %lx, %lx\n", rle->start, rle->count);
#endif
                return (0);
        } else
                kprintf("oops rle is gone\n");
        return (ENXIO);
}

static int
puc_setup_intr(device_t dev, device_t child, struct resource *r, int flags,
               void (*ihand)(void *), void *arg,
               void **cookiep, lwkt_serialize_t serializer)
{
        int i;
        struct puc_softc *sc;

        sc = (struct puc_softc *)device_get_softc(dev);
        for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
                if (sc->sc_ports[i].dev == child) {
                        if (sc->sc_ports[i].ihand != NULL)
                                return (ENXIO);
                        sc->sc_ports[i].ihand = ihand;
                        sc->sc_ports[i].ihandarg = arg;
                        KKASSERT(serializer == NULL); /* not handled yet XXX */
                        *cookiep = arg;
                        return (0);
                }
        }
        return (ENXIO);
}

static int
puc_teardown_intr(device_t dev, device_t child, struct resource *r,
                  void *cookie)
{
        int i;
        struct puc_softc *sc;

        sc = (struct puc_softc *)device_get_softc(dev);
        for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
                if (sc->sc_ports[i].dev == child) {
                        sc->sc_ports[i].ihand = NULL;
                        sc->sc_ports[i].ihandarg = NULL;
                        return (0);
                }
        }
        return (ENXIO);
}

static int
puc_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
{
        struct puc_device *pdev;

        pdev = device_get_ivars(child);
        if (pdev == NULL)
                return (ENOENT);

        switch(index) {
        case PUC_IVAR_FREQ:
                *result = pdev->serialfreq;
                break;
        default:
                return (ENOENT);
        }
        return (0);
}

static device_method_t puc_pci_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,             puc_pci_probe),
    DEVMETHOD(device_attach,            puc_pci_attach),

    DEVMETHOD(bus_alloc_resource,       puc_alloc_resource),
    DEVMETHOD(bus_release_resource,     puc_release_resource),
    DEVMETHOD(bus_get_resource,         puc_get_resource),
    DEVMETHOD(bus_read_ivar,            puc_read_ivar),
    DEVMETHOD(bus_setup_intr,           puc_setup_intr),
    DEVMETHOD(bus_teardown_intr,        puc_teardown_intr),
    DEVMETHOD(bus_print_child,          bus_generic_print_child),
    DEVMETHOD(bus_driver_added,         bus_generic_driver_added),
    DEVMETHOD_END
};

static driver_t puc_pci_driver = {
        "puc",
        puc_pci_methods,
        sizeof(struct puc_softc),
};

static devclass_t puc_devclass;

DRIVER_MODULE(puc, pci, puc_pci_driver, puc_devclass, NULL, NULL);