FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/ppb.c

     /*      $NetBSD: ppb.c,v 1.27 2003/12/09 19:51:39 briggs Exp $  */
     
     /*
      * Copyright (c) 1996, 1998 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.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: ppb.c,v 1.27 2003/12/09 19:51:39 briggs Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/device.h>
    
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pcivar.h>
    #include <dev/pci/ppbreg.h>
    
    struct ppb_softc {
            struct device sc_dev;           /* generic device glue */
            pci_chipset_tag_t sc_pc;        /* our PCI chipset... */
            pcitag_t sc_tag;                /* ...and tag. */
    };
    
    int     ppbmatch __P((struct device *, struct cfdata *, void *));
    void    ppbattach __P((struct device *, struct device *, void *));
    
    CFATTACH_DECL(ppb, sizeof(struct ppb_softc),
        ppbmatch, ppbattach, NULL, NULL);
    
    int     ppbprint __P((void *, const char *pnp));
    
    int
    ppbmatch(parent, match, aux)
            struct device *parent;
            struct cfdata *match;
            void *aux;
    {
            struct pci_attach_args *pa = aux;
    
            /*
             * Check the ID register to see that it's a PCI bridge.
             * If it is, we assume that we can deal with it; it _should_
             * work in a standardized way...
             */
            if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
                PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
                    return (1);
    
            return (0);
    }
    
    void
    ppbattach(parent, self, aux)
            struct device *parent, *self;
            void *aux;
    {
            struct ppb_softc *sc = (void *) self;
            struct pci_attach_args *pa = aux;
            pci_chipset_tag_t pc = pa->pa_pc;
            struct pcibus_attach_args pba;
            pcireg_t busdata;
            char devinfo[256];
    
            pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
            aprint_normal(": %s (rev. 0x%02x)\n", devinfo,
                PCI_REVISION(pa->pa_class));
            aprint_naive("\n");
    
            sc->sc_pc = pc;
            sc->sc_tag = pa->pa_tag;
    
            busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
   
           if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
                   aprint_normal("%s: not configured by system firmware\n",
                       self->dv_xname);
                   return;
           }
   
   #if 0
           /*
            * XXX can't do this, because we're not given our bus number
            * (we shouldn't need it), and because we've no way to
            * decompose our tag.
            */
           /* sanity check. */
           if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
                   panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
                       pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
   #endif
   
           /*
            * Attach the PCI bus than hangs off of it.
            *
            * XXX Don't pass-through Memory Read Multiple.  Should we?
            * XXX Consult the spec...
            */
           pba.pba_busname = "pci";        /* XXX should be pci_ppb attachment */
           pba.pba_iot = pa->pa_iot;
           pba.pba_memt = pa->pa_memt;
           pba.pba_dmat = pa->pa_dmat;
           pba.pba_dmat64 = pa->pa_dmat64;
           pba.pba_pc = pc;
           pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
           pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
           pba.pba_bridgetag = &sc->sc_tag;
           pba.pba_intrswiz = pa->pa_intrswiz;
           pba.pba_intrtag = pa->pa_intrtag;
   
           config_found(self, &pba, ppbprint);
   }
   
   int
   ppbprint(aux, pnp)
           void *aux;
           const char *pnp;
   {
           struct pcibus_attach_args *pba = aux;
   
           /* only PCIs can attach to PPBs; easy. */
           if (pnp)
                   aprint_normal("pci at %s", pnp);
           aprint_normal(" bus %d", pba->pba_bus);
           return (UNCONF);
   }

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