243 lines
7.3 KiB
C
243 lines
7.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
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* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 2000 BSDi
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* 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. 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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/*
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* PCI:ISA bridge support
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*/
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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/module.h>
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#include <sys/bus.h>
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#include <isa/isavar.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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static int isab_pci_probe(device_t dev);
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static int isab_pci_attach(device_t dev);
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static struct resource * isab_pci_alloc_resource(device_t dev,
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device_t child, int type, int *rid, rman_res_t start, rman_res_t end,
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rman_res_t count, u_int flags);
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static int isab_pci_release_resource(device_t dev, device_t child,
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int type, int rid, struct resource *r);
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static device_method_t isab_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, isab_pci_probe),
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DEVMETHOD(device_attach, isab_pci_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface */
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DEVMETHOD(bus_add_child, bus_generic_add_child),
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DEVMETHOD(bus_alloc_resource, isab_pci_alloc_resource),
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DEVMETHOD(bus_release_resource, isab_pci_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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DEVMETHOD_END
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};
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struct isab_pci_resource {
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struct resource *ip_res;
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int ip_refs;
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};
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struct isab_pci_softc {
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struct isab_pci_resource isab_pci_res[PCIR_MAX_BAR_0 + 1];
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};
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static driver_t isab_driver = {
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"isab",
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isab_methods,
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sizeof(struct isab_pci_softc),
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};
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DRIVER_MODULE(isab, pci, isab_driver, 0, 0);
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/*
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* XXX we need to add a quirk list here for bridges that don't correctly
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* report themselves.
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*/
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static int
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isab_pci_probe(device_t dev)
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{
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int matched = 0;
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/*
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* Try for a generic match based on class/subclass.
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*/
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if ((pci_get_class(dev) == PCIC_BRIDGE) &&
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(pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) {
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matched = 1;
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} else {
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/*
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* These are devices that we *know* are PCI:ISA bridges.
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* Sometimes, however, they don't report themselves as
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* such. Check in case one of them is pretending to be
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* something else.
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*/
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switch (pci_get_devid(dev)) {
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case 0x04848086: /* Intel 82378ZB/82378IB */
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case 0x122e8086: /* Intel 82371FB */
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case 0x70008086: /* Intel 82371SB */
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case 0x71108086: /* Intel 82371AB */
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case 0x71988086: /* Intel 82443MX */
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case 0x24108086: /* Intel 82801AA (ICH) */
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case 0x24208086: /* Intel 82801AB (ICH0) */
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case 0x24408086: /* Intel 82801AB (ICH2) */
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case 0x00061004: /* VLSI 82C593 */
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case 0x05861106: /* VIA 82C586 */
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case 0x05961106: /* VIA 82C596 */
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case 0x06861106: /* VIA 82C686 */
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case 0x153310b9: /* AcerLabs M1533 */
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case 0x154310b9: /* AcerLabs M1543 */
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case 0x00081039: /* SiS 85c503 */
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case 0x00001078: /* Cyrix Cx5510 */
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case 0x01001078: /* Cyrix Cx5530 */
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case 0xc7001045: /* OPTi 82C700 (FireStar) */
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case 0x886a1060: /* UMC UM8886 ISA */
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case 0x02001166: /* ServerWorks IB6566 PCI */
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if (bootverbose)
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printf("PCI-ISA bridge with incorrect subclass 0x%x\n",
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pci_get_subclass(dev));
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matched = 1;
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break;
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default:
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break;
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}
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}
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if (matched) {
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device_set_desc(dev, "PCI-ISA bridge");
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return(-10000);
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}
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return(ENXIO);
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}
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static int
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isab_pci_attach(device_t dev)
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{
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bus_generic_probe(dev);
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return (isab_attach(dev));
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}
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static struct resource *
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isab_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
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rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
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{
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struct isab_pci_softc *sc;
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int bar;
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if (device_get_parent(child) != dev)
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return bus_generic_alloc_resource(dev, child, type, rid, start,
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end, count, flags);
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switch (type) {
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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/*
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* For BARs, we cache the resource so that we only allocate it
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* from the PCI bus once.
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*/
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bar = PCI_RID2BAR(*rid);
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if (bar < 0 || bar > PCIR_MAX_BAR_0)
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return (NULL);
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sc = device_get_softc(dev);
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if (sc->isab_pci_res[bar].ip_res == NULL)
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sc->isab_pci_res[bar].ip_res = bus_alloc_resource(dev, type,
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rid, start, end, count, flags);
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if (sc->isab_pci_res[bar].ip_res != NULL)
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sc->isab_pci_res[bar].ip_refs++;
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return (sc->isab_pci_res[bar].ip_res);
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}
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return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid,
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start, end, count, flags));
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}
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static int
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isab_pci_release_resource(device_t dev, device_t child, int type, int rid,
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struct resource *r)
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{
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struct isab_pci_softc *sc;
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int bar, error;
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if (device_get_parent(child) != dev)
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return bus_generic_release_resource(dev, child, type, rid, r);
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switch (type) {
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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/*
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* For BARs, we release the resource from the PCI bus
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* when the last child reference goes away.
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*/
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bar = PCI_RID2BAR(rid);
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if (bar < 0 || bar > PCIR_MAX_BAR_0)
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return (EINVAL);
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sc = device_get_softc(dev);
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if (sc->isab_pci_res[bar].ip_res == NULL)
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return (EINVAL);
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KASSERT(sc->isab_pci_res[bar].ip_res == r,
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("isa_pci resource mismatch"));
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if (sc->isab_pci_res[bar].ip_refs > 1) {
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sc->isab_pci_res[bar].ip_refs--;
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return (0);
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}
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KASSERT(sc->isab_pci_res[bar].ip_refs > 0,
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("isa_pci resource reference count underflow"));
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error = bus_release_resource(dev, type, rid, r);
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if (error == 0) {
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sc->isab_pci_res[bar].ip_res = NULL;
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sc->isab_pci_res[bar].ip_refs = 0;
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}
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return (error);
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}
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return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type,
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rid, r));
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}
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