Update cardbus/pccard support.

[dragonfly/port-amd64.git] / sys / dev / pccard / exca / exca.c

/*-
 * Copyright (c) 2002-2005 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, 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.
 *
 * This software may be derived from NetBSD i82365.c and other files with
 * the following copyright:
 *
 * Copyright (c) 1997 Marc Horowitz.  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 Marc Horowitz.
 * 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.
 *
 * $FreeBSD: src/sys/dev/exca/exca.c,v 1.19 2005/01/11 00:32:43 imp Exp $
 * $DragonFly: src/sys/dev/pccard/exca/exca.c,v 1.4 2007/07/05 12:08:54 sephe Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/conf.h>

#include <sys/bus.h>
#include <sys/rman.h>

#include <bus/pccard/pccardreg.h>
#include <bus/pccard/pccardvar.h>

#include <dev/pccard/exca/excareg.h>
#include <dev/pccard/exca/excavar.h>

#ifdef EXCA_DEBUG
#define DEVPRINTF(dev, fmt, args...)    device_printf((dev), (fmt), ## args)
#define DPRINTF(fmt, args...)           kprintf(fmt, ## args)
#else
#define DEVPRINTF(dev, fmt, args...)
#define DPRINTF(fmt, args...)
#endif

#if 0
static const char *chip_names[] = 
{
        "CardBus socket",
        "Intel i82365SL-A/B or clone",
        "Intel i82365sl-DF step",
        "VLSI chip",
        "Cirrus Logic PD6710",
        "Cirrus logic PD6722",
        "Cirrus Logic PD6729",
        "Vadem 365",
        "Vadem 465",
        "Vadem 468",
        "Vadem 469",
        "Ricoh RF5C296",
        "Ricoh RF5C396",
        "IBM clone",
        "IBM KING PCMCIA Controller"
};
#endif

static exca_getb_fn exca_mem_getb;
static exca_putb_fn exca_mem_putb;
static exca_getb_fn exca_io_getb;
static exca_putb_fn exca_io_putb;

/* memory */

#define EXCA_MEMINFO(NUM) {                                             \
        EXCA_SYSMEM_ADDR ## NUM ## _START_LSB,                          \
        EXCA_SYSMEM_ADDR ## NUM ## _START_MSB,                          \
        EXCA_SYSMEM_ADDR ## NUM ## _STOP_LSB,                           \
        EXCA_SYSMEM_ADDR ## NUM ## _STOP_MSB,                           \
        EXCA_SYSMEM_ADDR ## NUM ## _WIN,                                \
        EXCA_CARDMEM_ADDR ## NUM ## _LSB,                               \
        EXCA_CARDMEM_ADDR ## NUM ## _MSB,                               \
        EXCA_ADDRWIN_ENABLE_MEM ## NUM,                                 \
}

static struct mem_map_index_st {
        int     sysmem_start_lsb;
        int     sysmem_start_msb;
        int     sysmem_stop_lsb;
        int     sysmem_stop_msb;
        int     sysmem_win;
        int     cardmem_lsb;
        int     cardmem_msb;
        int     memenable;
} mem_map_index[] = {
        EXCA_MEMINFO(0),
        EXCA_MEMINFO(1),
        EXCA_MEMINFO(2),
        EXCA_MEMINFO(3),
        EXCA_MEMINFO(4)
};
#undef  EXCA_MEMINFO

static uint8_t
exca_mem_getb(struct exca_softc *sc, int reg)
{
        return (bus_space_read_1(sc->bst, sc->bsh, sc->offset + reg));
}

static void
exca_mem_putb(struct exca_softc *sc, int reg, uint8_t val)
{
        bus_space_write_1(sc->bst, sc->bsh, sc->offset + reg, val);
}

static uint8_t
exca_io_getb(struct exca_softc *sc, int reg)
{
        bus_space_write_1(sc->bst, sc->bsh, EXCA_REG_INDEX, reg + sc->offset);
        return (bus_space_read_1(sc->bst, sc->bsh, EXCA_REG_DATA));
}

static void
exca_io_putb(struct exca_softc *sc, int reg, uint8_t val)
{
        bus_space_write_1(sc->bst, sc->bsh, EXCA_REG_INDEX, reg + sc->offset);
        bus_space_write_1(sc->bst, sc->bsh, EXCA_REG_DATA, val);
}

/*
 * Helper function.  This will map the requested memory slot.  We setup the
 * map before we call this function.  This is used to initially force the
 * mapping, as well as later restore the mapping after it has been destroyed
 * in some fashion (due to a power event typically).
 */
static void
exca_do_mem_map(struct exca_softc *sc, int win)
{
        struct mem_map_index_st *map;
        struct pccard_mem_handle *mem;
        uint32_t offset;
        
        map = &mem_map_index[win];
        mem = &sc->mem[win];
        offset = ((mem->cardaddr >> EXCA_CARDMEM_ADDRX_SHIFT) -
          (mem->addr >> EXCA_SYSMEM_ADDRX_SHIFT)) & 0x3fff;
        exca_putb(sc, map->sysmem_start_lsb,
            (mem->addr >> EXCA_SYSMEM_ADDRX_SHIFT) & 0xff);
        exca_putb(sc, map->sysmem_start_msb,
            ((mem->addr >> (EXCA_SYSMEM_ADDRX_SHIFT + 8)) &
            EXCA_SYSMEM_ADDRX_START_MSB_ADDR_MASK));

        exca_putb(sc, map->sysmem_stop_lsb,
            ((mem->addr + mem->realsize - 1) >>
            EXCA_SYSMEM_ADDRX_SHIFT) & 0xff);
        exca_putb(sc, map->sysmem_stop_msb,
            (((mem->addr + mem->realsize - 1) >>
            (EXCA_SYSMEM_ADDRX_SHIFT + 8)) &
            EXCA_SYSMEM_ADDRX_STOP_MSB_ADDR_MASK) |
            EXCA_SYSMEM_ADDRX_STOP_MSB_WAIT2);

        exca_putb(sc, map->sysmem_win,
            (mem->addr >> EXCA_MEMREG_WIN_SHIFT) & 0xff);

        exca_putb(sc, map->cardmem_lsb, offset & 0xff);
        exca_putb(sc, map->cardmem_msb, (((offset >> 8) & 0xff) &
            EXCA_CARDMEM_ADDRX_MSB_ADDR_MASK) |
            ((mem->kind == PCCARD_A_MEM_ATTR) ?
            EXCA_CARDMEM_ADDRX_MSB_REGACTIVE_ATTR : 0));

#ifdef EXCA_DEBUG
        if (mem->kind == PCCARD_A_MEM_ATTR)
                kprintf("attribtue memory\n");
        else
                kprintf("common memory\n");
#endif
        exca_setb(sc, EXCA_ADDRWIN_ENABLE, map->memenable |
            EXCA_ADDRWIN_ENABLE_MEMCS16);

        DELAY(100);
#ifdef EXCA_DEBUG
        {
                int r1, r2, r3, r4, r5, r6, r7;
                r1 = exca_getb(sc, map->sysmem_start_msb);
                r2 = exca_getb(sc, map->sysmem_start_lsb);
                r3 = exca_getb(sc, map->sysmem_stop_msb);
                r4 = exca_getb(sc, map->sysmem_stop_lsb);
                r5 = exca_getb(sc, map->cardmem_msb);
                r6 = exca_getb(sc, map->cardmem_lsb);
                r7 = exca_getb(sc, map->sysmem_win);
                kprintf("exca_do_mem_map win %d: %02x%02x %02x%02x "
                    "%02x%02x %02x (%08x+%06x.%06x*%06x)\n",
                    win, r1, r2, r3, r4, r5, r6, r7,
                    mem->addr, mem->size, mem->realsize,
                    mem->cardaddr);
        }
#endif
}

/*
 * public interface to map a resource.  kind is the type of memory to
 * map (either common or attribute).  Memory created via this interface
 * starts out at card address 0.  Since the only way to set this is
 * to set it on a struct resource after it has been mapped, we're safe
 * in maping this assumption.  Note that resources can be remapped using
 * exca_do_mem_map so that's how the card address can be set later.
 */
int
exca_mem_map(struct exca_softc *sc, int kind, struct resource *res)
{
        int win;

        for (win = 0; win < EXCA_MEM_WINS; win++) {
                if ((sc->memalloc & (1 << win)) == 0) {
                        sc->memalloc |= (1 << win);
                        break;
                }
        }
        if (win >= EXCA_MEM_WINS)
                return (1);
        if (((rman_get_start(res) >> EXCA_MEMREG_WIN_SHIFT) & 0xff) != 0 &&
            (sc->flags & EXCA_HAS_MEMREG_WIN) == 0) {
                device_printf(sc->dev, "Does not support mapping above 24M.");
                return (1);
        }

        sc->mem[win].cardaddr = 0;
        sc->mem[win].memt = rman_get_bustag(res);
        sc->mem[win].memh = rman_get_bushandle(res);
        sc->mem[win].addr = rman_get_start(res);
        sc->mem[win].size = rman_get_end(res) - sc->mem[win].addr + 1;
        sc->mem[win].realsize = sc->mem[win].size + EXCA_MEM_PAGESIZE - 1;
        sc->mem[win].realsize = sc->mem[win].realsize -
            (sc->mem[win].realsize % EXCA_MEM_PAGESIZE);
        sc->mem[win].kind = kind;
        DPRINTF("exca_mem_map window %d bus %x+%x card addr %x\n",
            win, sc->mem[win].addr, sc->mem[win].size, sc->mem[win].cardaddr);
        exca_do_mem_map(sc, win);

        return (0);
}

/*
 * Private helper function.  This turns off a given memory map that is in
 * use.  We do this by just clearing the enable bit in the pcic.  If we needed
 * to make memory unmapping/mapping pairs faster, we would have to store
 * more state information about the pcic and then use that to intelligently
 * to the map/unmap.  However, since we don't do that sort of thing often
 * (generally just at configure time), it isn't a case worth optimizing.
 */
static void
exca_mem_unmap(struct exca_softc *sc, int window)
{
        if (window < 0 || window >= EXCA_MEM_WINS)
                panic("exca_mem_unmap: window out of range");

        exca_clrb(sc, EXCA_ADDRWIN_ENABLE, mem_map_index[window].memenable);
        sc->memalloc &= ~(1 << window);
}

/*
 * Find the map that we're using to hold the resoruce.  This works well
 * so long as the client drivers don't do silly things like map the same
 * area mutliple times, or map both common and attribute memory at the
 * same time.  This latter restriction is a bug.  We likely should just
 * store a pointer to the res in the mem[x] data structure.
 */
static int
exca_mem_findmap(struct exca_softc *sc, struct resource *res)
{
        int win;

        for (win = 0; win < EXCA_MEM_WINS; win++) {
                if (sc->mem[win].memt == rman_get_bustag(res) &&
                    sc->mem[win].addr == rman_get_start(res) &&
                    sc->mem[win].size == rman_get_size(res))
                        return (win);
        }
        return (-1);
}

/*
 * Set the memory flag.  This means that we are setting if the memory
 * is coming from attribute memory or from common memory on the card.
 * CIS entries are generally in attribute memory (although they can
 * reside in common memory).  Generally, this is the only use for attribute
 * memory.  However, some cards require their drivers to dance in both
 * common and/or attribute memory and this interface (and setting the
 * offset interface) exist for such cards.
 */
int
exca_mem_set_flags(struct exca_softc *sc, struct resource *res, uint32_t flags)
{
        int win;

        win = exca_mem_findmap(sc, res);
        if (win < 0) {
                device_printf(sc->dev,
                    "set_res_flags: specified resource not active\n");
                return (ENOENT);
        }

        sc->mem[win].kind = flags;
        exca_do_mem_map(sc, win);
        return (0);
}

/*
 * Given a resource, go ahead and unmap it if we can find it in the
 * resrouce list that's used.
 */
int
exca_mem_unmap_res(struct exca_softc *sc, struct resource *res)
{
        int win;

        win = exca_mem_findmap(sc, res);
        if (win < 0)
                return (ENOENT);
        exca_mem_unmap(sc, win);
        return (0);
}
        
/*
 * Set the offset of the memory.  We use this for reading the CIS and
 * frobbing the pccard's pccard registers (POR, etc).  Some drivers
 * need to access this functionality as well, since they have receive
 * buffers defined in the attribute memory.
 */
int
exca_mem_set_offset(struct exca_softc *sc, struct resource *res,
    uint32_t cardaddr, uint32_t *deltap)
{
        int win;
        uint32_t delta;

        win = exca_mem_findmap(sc, res);
        if (win < 0) {
                device_printf(sc->dev,
                    "set_memory_offset: specified resource not active\n");
                return (ENOENT);
        }
        sc->mem[win].cardaddr = cardaddr & ~(EXCA_MEM_PAGESIZE - 1);
        delta = cardaddr % EXCA_MEM_PAGESIZE;
        if (deltap)
                *deltap = delta;
        sc->mem[win].realsize = sc->mem[win].size + delta +
            EXCA_MEM_PAGESIZE - 1;
        sc->mem[win].realsize = sc->mem[win].realsize -
            (sc->mem[win].realsize % EXCA_MEM_PAGESIZE);
        exca_do_mem_map(sc, win);
        return (0);
}
                        
\f
/* I/O */

#define EXCA_IOINFO(NUM) {                                              \
        EXCA_IOADDR ## NUM ## _START_LSB,                               \
        EXCA_IOADDR ## NUM ## _START_MSB,                               \
        EXCA_IOADDR ## NUM ## _STOP_LSB,                                \
        EXCA_IOADDR ## NUM ## _STOP_MSB,                                \
        EXCA_ADDRWIN_ENABLE_IO ## NUM,                                  \
        EXCA_IOCTL_IO ## NUM ## _WAITSTATE                              \
        | EXCA_IOCTL_IO ## NUM ## _ZEROWAIT                             \
        | EXCA_IOCTL_IO ## NUM ## _IOCS16SRC_MASK                       \
        | EXCA_IOCTL_IO ## NUM ## _DATASIZE_MASK,                       \
        {                                                               \
                EXCA_IOCTL_IO ## NUM ## _IOCS16SRC_CARD,                \
                EXCA_IOCTL_IO ## NUM ## _IOCS16SRC_DATASIZE             \
                | EXCA_IOCTL_IO ## NUM ## _DATASIZE_8BIT,               \
                EXCA_IOCTL_IO ## NUM ## _IOCS16SRC_DATASIZE             \
                | EXCA_IOCTL_IO ## NUM ## _DATASIZE_16BIT,              \
        }                                                               \
}

static struct io_map_index_st {
        int     start_lsb;
        int     start_msb;
        int     stop_lsb;
        int     stop_msb;
        int     ioenable;
        int     ioctlmask;
        int     ioctlbits[3]; /* indexed by PCCARD_WIDTH_* */
} io_map_index[] = {
        EXCA_IOINFO(0),
        EXCA_IOINFO(1),
};
#undef  EXCA_IOINFO

static void
exca_do_io_map(struct exca_softc *sc, int win)
{
        struct io_map_index_st *map;

        struct pccard_io_handle *io;

        map = &io_map_index[win];
        io = &sc->io[win];
        exca_putb(sc, map->start_lsb, io->addr & 0xff);
        exca_putb(sc, map->start_msb, (io->addr >> 8) & 0xff);

        exca_putb(sc, map->stop_lsb, (io->addr + io->size - 1) & 0xff);
        exca_putb(sc, map->stop_msb, ((io->addr + io->size - 1) >> 8) & 0xff);

        exca_clrb(sc, EXCA_IOCTL, map->ioctlmask);
        exca_setb(sc, EXCA_IOCTL, map->ioctlbits[io->width]);

        exca_setb(sc, EXCA_ADDRWIN_ENABLE, map->ioenable);
#ifdef EXCA_DEBUG
        {
                int r1, r2, r3, r4;
                r1 = exca_getb(sc, map->start_msb);
                r2 = exca_getb(sc, map->start_lsb);
                r3 = exca_getb(sc, map->stop_msb);
                r4 = exca_getb(sc, map->stop_lsb);
                DPRINTF("exca_do_io_map window %d: %02x%02x %02x%02x "
                    "(%08x+%08x)\n", win, r1, r2, r3, r4,
                    io->addr, io->size);
        }
#endif
}

int
exca_io_map(struct exca_softc *sc, int width, struct resource *r)
{
        int win;
#ifdef EXCA_DEBUG
        static char *width_names[] = { "auto", "io8", "io16"};
#endif
        for (win=0; win < EXCA_IO_WINS; win++) {
                if ((sc->ioalloc & (1 << win)) == 0) {
                        sc->ioalloc |= (1 << win);
                        break;
                }
        }
        if (win >= EXCA_IO_WINS)
                return (1);

        sc->io[win].iot = rman_get_bustag(r);
        sc->io[win].ioh = rman_get_bushandle(r);
        sc->io[win].addr = rman_get_start(r);
        sc->io[win].size = rman_get_end(r) - sc->io[win].addr + 1;
        sc->io[win].flags = 0;
        sc->io[win].width = width;
        DPRINTF("exca_io_map window %d %s port %x+%x\n",
            win, width_names[width], sc->io[win].addr,
            sc->io[win].size);
        exca_do_io_map(sc, win);

        return (0);
}

static void
exca_io_unmap(struct exca_softc *sc, int window)
{
        if (window >= EXCA_IO_WINS)
                panic("exca_io_unmap: window out of range");

        exca_clrb(sc, EXCA_ADDRWIN_ENABLE, io_map_index[window].ioenable);

        sc->ioalloc &= ~(1 << window);

        sc->io[window].iot = 0;
        sc->io[window].ioh = 0;
        sc->io[window].addr = 0;
        sc->io[window].size = 0;
        sc->io[window].flags = 0;
        sc->io[window].width = 0;
}

static int
exca_io_findmap(struct exca_softc *sc, struct resource *res)
{
        int win;

        for (win = 0; win < EXCA_IO_WINS; win++) {
                if (sc->io[win].iot == rman_get_bustag(res) &&
                    sc->io[win].addr == rman_get_start(res) &&
                    sc->io[win].size == rman_get_size(res))
                        return (win);
        }
        return (-1);
}


int
exca_io_unmap_res(struct exca_softc *sc, struct resource *res)
{
        int win;

        win = exca_io_findmap(sc, res);
        if (win < 0)
                return (ENOENT);
        exca_io_unmap(sc, win);
        return (0);
}
\f
/* Misc */

/*
 * If interrupts are enabled, then we should be able to just wait for
 * an interrupt routine to wake us up.  Busy waiting shouldn't be
 * necessary.  Sadly, not all legacy ISA cards support an interrupt
 * for the busy state transitions, at least according to their datasheets, 
 * so we busy wait a while here..
 */
static void
exca_wait_ready(struct exca_softc *sc)
{
        int i;
        DEVPRINTF(sc->dev, "exca_wait_ready: status 0x%02x\n",
            exca_getb(sc, EXCA_IF_STATUS));
        for (i = 0; i < 10000; i++) {
                if (exca_getb(sc, EXCA_IF_STATUS) & EXCA_IF_STATUS_READY)
                        return;
                DELAY(500);
        }
        device_printf(sc->dev, "ready never happened, status = %02x\n",
            exca_getb(sc, EXCA_IF_STATUS));
}

/*
 * Reset the card.  Ideally, we'd do a lot of this via interrupts.
 * However, many PC Cards will deassert the ready signal.  This means
 * that they are asserting an interrupt.  This makes it hard to 
 * do anything but a busy wait here.  One could argue that these
 * such cards are broken, or that the bridge that allows this sort
 * of interrupt through isn't quite what you'd want (and may be a standards
 * violation).  However, such arguing would leave a huge class of pc cards
 * and bridges out of reach for use in the system.
 *
 * Maybe I should reevaluate the above based on the power bug I fixed
 * in OLDCARD.
 */
void
exca_reset(struct exca_softc *sc, device_t child)
{
        int win;

        /* enable socket i/o */
        exca_setb(sc, EXCA_PWRCTL, EXCA_PWRCTL_OE);

        exca_putb(sc, EXCA_INTR, EXCA_INTR_ENABLE);
        /* hold reset for 30ms */
        DELAY(30*1000);
        /* clear the reset flag */
        exca_setb(sc, EXCA_INTR, EXCA_INTR_RESET);
        /* wait 20ms as per pc card standard (r2.01) section 4.3.6 */
        DELAY(20*1000);

        exca_wait_ready(sc);

        /* disable all address windows */
        exca_putb(sc, EXCA_ADDRWIN_ENABLE, 0);

        exca_setb(sc, EXCA_INTR, EXCA_INTR_CARDTYPE_IO);
        DEVPRINTF(sc->dev, "card type is io\n");

        /* reinstall all the memory and io mappings */
        for (win = 0; win < EXCA_MEM_WINS; ++win)
                if (sc->memalloc & (1 << win))
                        exca_do_mem_map(sc, win);
        for (win = 0; win < EXCA_IO_WINS; ++win)
                if (sc->ioalloc & (1 << win))
                        exca_do_io_map(sc, win);
}

/*
 * Initialize the exca_softc data structure for the first time.
 */
void
exca_init(struct exca_softc *sc, device_t dev, 
    bus_space_tag_t bst, bus_space_handle_t bsh, uint32_t offset)
{
        sc->dev = dev;
        sc->memalloc = 0;
        sc->ioalloc = 0;
        sc->bst = bst;
        sc->bsh = bsh;
        sc->offset = offset;
        sc->flags = 0;
        sc->getb = exca_mem_getb;
        sc->putb = exca_mem_putb;
}

/*
 * Is this socket valid?
 */
static int
exca_valid_slot(struct exca_softc *exca)
{
        uint8_t c;

        /* Assume the worst */
        exca->chipset = EXCA_BOGUS;

        /*
         * see if there's a PCMCIA controller here
         * Intel PCMCIA controllers use 0x82 and 0x83
         * IBM clone chips use 0x88 and 0x89, apparently
         */
        c = exca_getb(exca, EXCA_IDENT);
        if ((c & EXCA_IDENT_IFTYPE_MASK) != EXCA_IDENT_IFTYPE_MEM_AND_IO)
                return (0);
        if ((c & EXCA_IDENT_ZERO) != 0)
                return (0);
        switch (c & EXCA_IDENT_REV_MASK) {
        /*
         *      82365 or clones.
         */
        case EXCA_IDENT_REV_I82365SLR0:
        case EXCA_IDENT_REV_I82365SLR1:
                exca->chipset = EXCA_I82365;
                /*
                 * Check for Vadem chips by unlocking their extra
                 * registers and looking for valid ID.  Bit 3 in
                 * the ID register is normally 0, except when
                 * EXCA_VADEMREV is set.  Other bridges appear
                 * to ignore this frobbing.
                 */
                bus_space_write_1(exca->bst, exca->bsh, EXCA_REG_INDEX,
                    EXCA_VADEM_COOKIE1);
                bus_space_write_1(exca->bst, exca->bsh, EXCA_REG_INDEX,
                    EXCA_VADEM_COOKIE2);
                exca_setb(exca, EXCA_VADEM_VMISC, EXCA_VADEM_REV);
                c = exca_getb(exca, EXCA_IDENT);
                if (c & 0x08) {
                        switch (c & 7) {
                        case 1:
                                exca->chipset = EXCA_VG365;
                                break;
                        case 2:
                                exca->chipset = EXCA_VG465;
                                break;
                        case 3:
                                exca->chipset = EXCA_VG468;
                                break;
                        default:
                                exca->chipset = EXCA_VG469;
                                break;
                        }
                        exca_clrb(exca, EXCA_VADEM_VMISC, EXCA_VADEM_REV);
                        break;
                }
                /*
                 * Check for RICOH RF5C[23]96 PCMCIA Controller
                 */
                c = exca_getb(exca, EXCA_RICOH_ID);
                if (c == EXCA_RID_396) {
                        exca->chipset = EXCA_RF5C396;
                        break;
                } else if (c == EXCA_RID_296) {
                        exca->chipset = EXCA_RF5C296;
                        break;
                }
                /*
                 *      Check for Cirrus logic chips.
                 */
                exca_putb(exca, EXCA_CIRRUS_CHIP_INFO, 0);
                c = exca_getb(exca, EXCA_CIRRUS_CHIP_INFO);
                if ((c & EXCA_CIRRUS_CHIP_INFO_CHIP_ID) ==
                    EXCA_CIRRUS_CHIP_INFO_CHIP_ID) {
                        c = exca_getb(exca, EXCA_CIRRUS_CHIP_INFO);
                        if ((c & EXCA_CIRRUS_CHIP_INFO_CHIP_ID) == 0) {
                                if (c & EXCA_CIRRUS_CHIP_INFO_SLOTS)
                                        exca->chipset = EXCA_PD6722;
                                else
                                        exca->chipset = EXCA_PD6710;
                                break;
                        }
                }
                break;

        case EXCA_IDENT_REV_I82365SLDF:
                /*
                 *      Intel i82365sl-DF step or maybe a vlsi 82c146
                 * we detected the vlsi case earlier, so if the controller
                 * isn't set, we know it is a i82365sl step D.
                 */
                exca->chipset = EXCA_I82365SL_DF;
                break;
        case EXCA_IDENT_REV_IBM1:
        case EXCA_IDENT_REV_IBM2:
                exca->chipset = EXCA_IBM;
                break;
        case EXCA_IDENT_REV_IBM_KING:
                exca->chipset = EXCA_IBM_KING;
                break;
        default:
                return (0);
        }
        return (1);
}

/*
 * Probe the expected slots.  We maybe should set the ID for each of these
 * slots too while we're at it.  But maybe that belongs to a separate
 * function.
 *
 * The caller must guarantee that at least EXCA_NSLOTS are present in exca.
 */
int
exca_probe_slots(device_t dev, struct exca_softc *exca, bus_space_tag_t iot,
    bus_space_handle_t ioh)
{
        int err;
        int i;

        err = ENXIO;
        for (i = 0; i < EXCA_NSLOTS; i++)  {
                exca_init(&exca[i], dev, iot, ioh, i * EXCA_SOCKET_SIZE);
                exca->getb = exca_io_getb;
                exca->putb = exca_io_putb;
                if (exca_valid_slot(&exca[i]))
                        err = 0;
        }
        return (err);
}

void
exca_insert(struct exca_softc *exca)
{
        if (exca->pccarddev != NULL) {
                if (CARD_ATTACH_CARD(exca->pccarddev) != 0)
                        device_printf(exca->dev,
                            "PC Card card activation failed\n");
        } else {
                device_printf(exca->dev,
                    "PC Card inserted, but no pccard bus.\n");
        }
}
  

void
exca_removal(struct exca_softc *exca)
{
        if (exca->pccarddev != NULL)
                CARD_DETACH_CARD(exca->pccarddev);
}

int
exca_activate_resource(struct exca_softc *exca, device_t child, int type,
    int rid, struct resource *res)
{
        int err;
        if (!(rman_get_flags(res) & RF_ACTIVE)) { /* not already activated */
                switch (type) {
                case SYS_RES_IOPORT:
                        err = exca_io_map(exca, PCCARD_WIDTH_AUTO, res);
                        break;
                case SYS_RES_MEMORY:
                        err = exca_mem_map(exca, PCCARD_A_MEM_COM, res);
                        break;
                default:
                        err = 0;
                        break;
                }
                if (err)
                        return (err);

        }
        return (BUS_ACTIVATE_RESOURCE(device_get_parent(exca->dev), child,
                  type, rid, res));
}

int
exca_deactivate_resource(struct exca_softc *exca, device_t child, int type,
    int rid, struct resource *res)
{
        if (rman_get_flags(res) & RF_ACTIVE) { /* if activated */
                switch (type) {
                case SYS_RES_IOPORT:
                        if (exca_io_unmap_res(exca, res))
                                return (ENOENT);
                        break;
                case SYS_RES_MEMORY:
                        if (exca_mem_unmap_res(exca, res))
                                return (ENOENT);
                        break;
                }
        }
        return (BUS_DEACTIVATE_RESOURCE(device_get_parent(exca->dev), child,
            type, rid, res));
}

#if 0
static struct resource *
exca_alloc_resource(struct exca_softc *sc, device_t child, int type, int *rid,
    u_long start, u_long end, u_long count, uint flags)
{
        struct resource *res = NULL;
        int tmp;

        switch (type) {
        case SYS_RES_MEMORY:
                if (start < cbb_start_mem)
                        start = cbb_start_mem;
                if (end < start)
                        end = start;
                flags = (flags & ~RF_ALIGNMENT_MASK) |
                    rman_make_alignment_flags(CBB_MEMALIGN);
                break;
        case SYS_RES_IOPORT:
                if (start < cbb_start_16_io)
                        start = cbb_start_16_io;
                if (end < start)
                        end = start;
                break;
        case SYS_RES_IRQ:
                tmp = rman_get_start(sc->irq_res);
                if (start > tmp || end < tmp || count != 1) {
                        device_printf(child, "requested interrupt %ld-%ld,"
                            "count = %ld not supported by cbb\n",
                            start, end, count);
                        return (NULL);
                }
                flags |= RF_SHAREABLE;
                start = end = rman_get_start(sc->irq_res);
                break;
        }
        res = BUS_ALLOC_RESOURCE(up, child, type, rid,
            start, end, count, flags & ~RF_ACTIVE);
        if (res == NULL)
                return (NULL);
        cbb_insert_res(sc, res, type, *rid);
        if (flags & RF_ACTIVE) {
                if (bus_activate_resource(child, type, *rid, res) != 0) {
                        bus_release_resource(child, type, *rid, res);
                        return (NULL);
                }
        }

        return (res);
}

static int
exca_release_resource(struct exca_softc *sc, device_t child, int type,
    int rid, struct resource *res)
{
        int error;

        if (rman_get_flags(res) & RF_ACTIVE) {
                error = bus_deactivate_resource(child, type, rid, res);
                if (error != 0)
                        return (error);
        }
        cbb_remove_res(sc, res);
        return (BUS_RELEASE_RESOURCE(device_get_parent(brdev), child,
            type, rid, res));
}
#endif

static int
exca_modevent(module_t mod, int cmd, void *arg)
{
        return 0;
}

DEV_MODULE(exca, exca_modevent, NULL);
MODULE_VERSION(exca, 1);