FreeBSD/Linux Kernel Cross Reference
sys/dev/exca/exca.c

     /* $FreeBSD: releng/5.0/sys/dev/exca/exca.c 104601 2002-10-07 06:18:50Z imp $ */
     
     /*
      * Copyright (c) 2002 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.
     */
    
    #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/conf.h>
    
    #include <sys/bus.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <machine/resource.h>
    
    #include <dev/pccard/pccardreg.h>
    #include <dev/pccard/pccardvar.h>
    
    #include <dev/exca/excareg.h>
    #include <dev/exca/excavar.h>
    
    #ifdef EXCA_DEBUG
    #define DEVPRINTF(dev, fmt, args...)    device_printf((dev), (fmt), ## args)
    #define DPRINTF(fmt, args...)           printf(fmt, ## args)
    #else
    #define DEVPRINTF(dev, fmt, args...)
    #define DPRINTF(fmt, args...)
    #endif
    
    /* 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
   
   /*
    * 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;
           
           map = &mem_map_index[win];
           mem = &sc->mem[win];
           exca_write(sc, map->sysmem_start_lsb,
               (mem->addr >> EXCA_SYSMEM_ADDRX_SHIFT) & 0xff);
           exca_write(sc, map->sysmem_start_msb,
               ((mem->addr >> (EXCA_SYSMEM_ADDRX_SHIFT + 8)) &
               EXCA_SYSMEM_ADDRX_START_MSB_ADDR_MASK) | 0x80);
   
           exca_write(sc, map->sysmem_stop_lsb,
               ((mem->addr + mem->realsize - 1) >>
               EXCA_SYSMEM_ADDRX_SHIFT) & 0xff);
           exca_write(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_write(sc, map->sysmem_win,
               (mem->addr >> EXCA_MEMREG_WIN_SHIFT) & 0xff);
   
           exca_write(sc, map->cardmem_lsb,
               (mem->offset >> EXCA_CARDMEM_ADDRX_SHIFT) & 0xff);
           exca_write(sc, map->cardmem_msb,
               ((mem->offset >> (EXCA_CARDMEM_ADDRX_SHIFT + 8)) &
               EXCA_CARDMEM_ADDRX_MSB_ADDR_MASK) |
               ((mem->kind == PCCARD_MEM_ATTR) ?
               EXCA_CARDMEM_ADDRX_MSB_REGACTIVE_ATTR : 0));
   
           exca_setb(sc, EXCA_ADDRWIN_ENABLE, EXCA_ADDRWIN_ENABLE_MEMCS16 |
               map->memenable);
   
           DELAY(100);
   #ifdef EXCA_DEBUG
           {
                   int r1, r2, r3, r4, r5, r6, r7;
                   r1 = exca_read(sc, map->sysmem_start_msb);
                   r2 = exca_read(sc, map->sysmem_start_lsb);
                   r3 = exca_read(sc, map->sysmem_stop_msb);
                   r4 = exca_read(sc, map->sysmem_stop_lsb);
                   r5 = exca_read(sc, map->cardmem_msb);
                   r6 = exca_read(sc, map->cardmem_lsb);
                   r7 = exca_read(sc, map->sysmem_win);
                   printf("exca_do_mem_map window %d: %02x%02x %02x%02x "
                       "%02x%02x %02x (%08x+%08x.%08x*%08lx)\n",
                       win, r1, r2, r3, r4, r5, r6, r7,
                       mem->addr, mem->size, mem->realsize,
                       mem->offset);
           }
   #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_CARDMEM_ADDRX_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].offset = (long)(sc->mem[win].addr);
           sc->mem[win].kind = kind;
           DPRINTF("exca_mem_map window %d bus %x+%x+%lx card addr %x\n",
               win, sc->mem[win].addr, sc->mem[win].size,
               sc->mem[win].offset, 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.  Thankfully, these cards
    * are few and fare between.  Some cards also have common memory that
    * is large and only map a small portion of it at a time (but these cards
    * are rare, the more common case being to have just a small amount
    * of common memory that the driver needs to bcopy data from in order to
    * get at it.
    */
   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;
           delta = cardaddr % EXCA_MEM_PAGESIZE;
           if (deltap)
                   *deltap = delta;
           cardaddr -= 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);
           sc->mem[win].offset = cardaddr - sc->mem[win].addr;
           exca_do_mem_map(sc, win);
           return (0);
   }
                           
   
   /* 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_write(sc, map->start_lsb, io->addr & 0xff);
           exca_write(sc, map->start_msb, (io->addr >> 8) & 0xff);
   
           exca_write(sc, map->stop_lsb, (io->addr + io->size - 1) & 0xff);
           exca_write(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_read(sc, map->start_msb);
                   r2 = exca_read(sc, map->start_lsb);
                   r3 = exca_read(sc, map->stop_msb);
                   r4 = exca_read(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);
   }
   
   /* 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_read(sc, EXCA_IF_STATUS));
           for (i = 0; i < 10000; i++) {
                   if (exca_read(sc, EXCA_IF_STATUS) & EXCA_IF_STATUS_READY)
                           return;
                   DELAY(500);
           }
           device_printf(sc->dev, "ready never happened, status = %02x\n",
               exca_read(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 cardtype;
           int win;
   
           /* enable socket i/o */
           exca_setb(sc, EXCA_PWRCTL, EXCA_PWRCTL_OE);
   
           exca_write(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_write(sc, EXCA_ADDRWIN_ENABLE, 0);
   
           CARD_GET_TYPE(child, &cardtype);
           exca_setb(sc, EXCA_INTR, (cardtype == PCCARD_IFTYPE_IO) ?
               EXCA_INTR_CARDTYPE_IO : EXCA_INTR_CARDTYPE_MEM);
           DEVPRINTF(sc->dev, "card type is %s\n",
               (cardtype == PCCARD_IFTYPE_IO) ? "io" : "mem");
   
           /* 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;
   }
   
   /*
    * 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.
    *
    * Callers must charantee that there are at least EXCA_NSLOTS (4) in
    * the array that they pass the address of the first element in the
    * "exca" parameter.
    */
   int
   exca_probe_slots(device_t dev, struct exca_softc *exca)
   {
           int rid;
           struct resource *res;
           int err;
           bus_space_tag_t iot;
           bus_space_handle_t ioh;
           int i;
   
           err = ENXIO;
           rid = 0;
           res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, EXCA_IOSIZE,
               RF_ACTIVE);
           if (res == NULL)
                   return (ENXIO);
           iot = rman_get_bustag(res);
           ioh = rman_get_bushandle(res);
           for (i = 0; i < EXCA_NSLOTS; i++) {
                   exca_init(&exca[i], dev, iot, ioh, i * EXCA_SOCKET_SIZE);
                   if (exca_is_pcic(&exca[i])) {
                           err = 0;
                           exca[i].flags |= EXCA_SOCKET_PRESENT;
                   }
           }
           bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
           return (err);
   }
   
   int
   exca_is_pcic(struct exca_softc *sc)
   {
           /* XXX */
           return (0);
   }
   
   static int exca_modevent(module_t mod, int cmd, void *arg)
   {
           return 0;
   }
   DEV_MODULE(exca, exca_modevent, NULL);
   MODULE_VERSION(exca, 1);

Cache object: 032311c1aea2d5e4e018c62de7feae6a