204183c0fa
NULL for root PCI busses. For busses behind a bridge, it points to a persistent copy of the bridge's pcitag_t. This can be very useful for machine-dependent PCI bus enumeration code. * Implement a machine-dependent pci_enumerate_bus() for sparc64 which uses OFW device nodes to enumerate the bus. When a PCI bus that is behind a bridge is attached, pci_attach_hook() allocates a new PCI chipset tag for the new bus and sets it's "curnode" to the OFW node of the bridge. This is used as a starting point when enumerating that bus. Root busses get the OFW node of the host bridge (psycho). * Garbage-collect "ofpci" and "ofppb" from the sparc64 port.
151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/* $NetBSD: ppb.c,v 1.21 2002/05/16 01:01:30 thorpej Exp $ */
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/*
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* Copyright (c) 1996, 1998 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ppb.c,v 1.21 2002/05/16 01:01:30 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/ppbreg.h>
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struct ppb_softc {
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struct device sc_dev; /* generic device glue */
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pci_chipset_tag_t sc_pc; /* our PCI chipset... */
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pcitag_t sc_tag; /* ...and tag. */
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};
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int ppbmatch __P((struct device *, struct cfdata *, void *));
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void ppbattach __P((struct device *, struct device *, void *));
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struct cfattach ppb_ca = {
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sizeof(struct ppb_softc), ppbmatch, ppbattach
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};
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int ppbprint __P((void *, const char *pnp));
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int
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ppbmatch(parent, match, aux)
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struct device *parent;
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struct cfdata *match;
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void *aux;
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{
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struct pci_attach_args *pa = aux;
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/*
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* Check the ID register to see that it's a PCI bridge.
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* If it is, we assume that we can deal with it; it _should_
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* work in a standardized way...
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*/
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if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
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PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
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return (1);
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return (0);
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}
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void
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ppbattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct ppb_softc *sc = (void *) self;
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struct pci_attach_args *pa = aux;
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pci_chipset_tag_t pc = pa->pa_pc;
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struct pcibus_attach_args pba;
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pcireg_t busdata;
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char devinfo[256];
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pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
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printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
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sc->sc_pc = pc;
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sc->sc_tag = pa->pa_tag;
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busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
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if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
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printf("%s: not configured by system firmware\n",
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self->dv_xname);
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return;
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}
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#if 0
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/*
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* XXX can't do this, because we're not given our bus number
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* (we shouldn't need it), and because we've no way to
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* decompose our tag.
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*/
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/* sanity check. */
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if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
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panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
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pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
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#endif
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/*
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* Attach the PCI bus than hangs off of it.
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*
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* XXX Don't pass-through Memory Read Multiple. Should we?
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* XXX Consult the spec...
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*/
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pba.pba_busname = "pci"; /* XXX should be pci_ppb attachment */
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pba.pba_iot = pa->pa_iot;
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pba.pba_memt = pa->pa_memt;
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pba.pba_dmat = pa->pa_dmat;
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pba.pba_pc = pc;
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pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
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pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
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pba.pba_bridgetag = &sc->sc_tag;
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pba.pba_intrswiz = pa->pa_intrswiz;
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pba.pba_intrtag = pa->pa_intrtag;
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config_found(self, &pba, ppbprint);
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}
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int
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ppbprint(aux, pnp)
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void *aux;
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const char *pnp;
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{
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struct pcibus_attach_args *pba = aux;
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/* only PCIs can attach to PPBs; easy. */
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if (pnp)
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printf("pci at %s", pnp);
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printf(" bus %d", pba->pba_bus);
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return (UNCONF);
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}
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