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/* $OpenBSD: pci_bus_fixup.c,v 1.6 2000/10/31 18:56:42 deraadt Exp $ */
/* $NetBSD: pci_bus_fixup.c,v 1.1 1999/11/17 07:32:58 thorpej Exp $ */
/*
* Copyright (c) 1999, by UCHIYAMA Yasushi
* 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. The name of the developer 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 bus renumbering support.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/ppbreg.h>
#include <i386/pci/pci_bus_fixup.h>
#include <i386/pci/pcibiosvar.h>
int
pci_bus_fixup(pc, bus)
pci_chipset_tag_t pc;
int bus;
{
#ifdef PCIBIOSVERBOSE
static int bridge_cnt;
int bridge;
#endif
int device, maxdevs, function, nfuncs, bus_max, bus_sub;
const struct pci_quirkdata *qd;
pcireg_t reg;
pcitag_t tag;
bus_max = bus;
bus_sub = 0;
maxdevs = pci_bus_maxdevs(pc, bus);
for (device = 0; device < maxdevs; device++) {
tag = pci_make_tag(pc, bus, device, 0);
reg = pci_conf_read(pc, tag, PCI_ID_REG);
/* can't be that many */
if (bus_max == 255)
break;
/* Invalid vendor ID value? */
if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID)
continue;
/* XXX Not invalid, but we've done this ~forever. */
if (PCI_VENDOR(reg) == 0)
continue;
qd = pci_lookup_quirkdata(PCI_VENDOR(reg), PCI_PRODUCT(reg));
reg = pci_conf_read(pc, tag, PCI_BHLC_REG);
if (PCI_HDRTYPE_MULTIFN(reg) ||
(qd != NULL &&
(qd->quirks & PCI_QUIRK_MULTIFUNCTION) != 0))
nfuncs = 8;
else
nfuncs = 1;
for (function = 0; function < nfuncs; function++) {
tag = pci_make_tag(pc, bus, device, function);
reg = pci_conf_read(pc, tag, PCI_ID_REG);
/* Invalid vendor ID value? */
if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID)
continue;
/* XXX Not invalid, but we've done this ~forever. */
if (PCI_VENDOR(reg) == 0)
continue;
reg = pci_conf_read(pc, tag, PCI_CLASS_REG);
if (PCI_CLASS(reg) == PCI_CLASS_BRIDGE &&
(PCI_SUBCLASS(reg) == PCI_SUBCLASS_BRIDGE_PCI ||
PCI_SUBCLASS(reg) == PCI_SUBCLASS_BRIDGE_CARDBUS)) {
/* Assign the bridge's secondary bus #. */
bus_max++;
reg = pci_conf_read(pc, tag, PPB_REG_BUSINFO);
reg &= 0xff000000;
reg |= bus | (bus_max << 8) | (0xff << 16);
pci_conf_write(pc, tag, PPB_REG_BUSINFO, reg);
/* Scan subordinate bus. */
bus_sub = pci_bus_fixup(pc, bus_max);
/* Configure the bridge. */
reg &= 0xff000000;
reg |= bus | (bus_max << 8) | (bus_sub << 16);
pci_conf_write(pc, tag, PPB_REG_BUSINFO, reg);
#ifdef PCIBIOSVERBOSE
/* Assign the bridge #. */
bridge = bridge_cnt++;
printf("PCI bridge %d: primary %d, "
"secondary %d, subordinate %d\n",
bridge, bus, bus_max, bus_sub);
#endif
/* Next bridge's secondary bus #. */
bus_max = (bus_sub > bus_max) ?
bus_sub : bus_max;
}
}
}
return (bus_max); /* last # of subordinate bus */
}
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