FreeBSD-5.3/sys/amd64/pci/pci_bus.c
/*
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* 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 unmodified, 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/amd64/pci/pci_bus.c,v 1.109 2004/06/03 05:58:30 phk Exp $");
#include "opt_cpu.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcib_private.h>
#include <isa/isavar.h>
#include <machine/legacyvar.h>
#include <machine/pci_cfgreg.h>
#include "pcib_if.h"
int
legacy_pcib_maxslots(device_t dev)
{
return 31;
}
/* read configuration space register */
u_int32_t
legacy_pcib_read_config(device_t dev, int bus, int slot, int func,
int reg, int bytes)
{
return(pci_cfgregread(bus, slot, func, reg, bytes));
}
/* write configuration space register */
void
legacy_pcib_write_config(device_t dev, int bus, int slot, int func,
int reg, u_int32_t data, int bytes)
{
pci_cfgregwrite(bus, slot, func, reg, data, bytes);
}
/* route interrupt */
static int
legacy_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
{
/* No routing possible */
return (PCI_INVALID_IRQ);
}
static const char *
legacy_pcib_is_host_bridge(int bus, int slot, int func,
u_int32_t id, u_int8_t class, u_int8_t subclass,
u_int8_t *busnum)
{
const char *s = NULL;
*busnum = 0;
if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
s = "Host to PCI bridge";
return s;
}
/*
* Scan the first pci bus for host-pci bridges and add pcib instances
* to the nexus for each bridge.
*/
static void
legacy_pcib_identify(driver_t *driver, device_t parent)
{
int bus, slot, func;
u_int8_t hdrtype;
int found = 0;
int pcifunchigh;
int found824xx = 0;
int found_orion = 0;
device_t child;
devclass_t pci_devclass;
if (pci_cfgregopen() == 0)
return;
/*
* Check to see if we haven't already had a PCI bus added
* via some other means. If we have, bail since otherwise
* we're going to end up duplicating it.
*/
if ((pci_devclass = devclass_find("pci")) &&
devclass_get_device(pci_devclass, 0))
return;
bus = 0;
retry:
for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
func = 0;
hdrtype = legacy_pcib_read_config(0, bus, slot, func,
PCIR_HDRTYPE, 1);
/*
* When enumerating bus devices, the standard says that
* one should check the header type and ignore the slots whose
* header types that the software doesn't know about. We use
* this to filter out devices.
*/
if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
continue;
if ((hdrtype & PCIM_MFDEV) &&
(!found_orion || hdrtype != 0xff))
pcifunchigh = PCI_FUNCMAX;
else
pcifunchigh = 0;
for (func = 0; func <= pcifunchigh; func++) {
/*
* Read the IDs and class from the device.
*/
u_int32_t id;
u_int8_t class, subclass, busnum;
const char *s;
device_t *devs;
int ndevs, i;
id = legacy_pcib_read_config(0, bus, slot, func,
PCIR_DEVVENDOR, 4);
if (id == -1)
continue;
class = legacy_pcib_read_config(0, bus, slot, func,
PCIR_CLASS, 1);
subclass = legacy_pcib_read_config(0, bus, slot, func,
PCIR_SUBCLASS, 1);
s = legacy_pcib_is_host_bridge(bus, slot, func,
id, class, subclass,
&busnum);
if (s == NULL)
continue;
/*
* Check to see if the physical bus has already
* been seen. Eg: hybrid 32 and 64 bit host
* bridges to the same logical bus.
*/
if (device_get_children(parent, &devs, &ndevs) == 0) {
for (i = 0; s != NULL && i < ndevs; i++) {
if (strcmp(device_get_name(devs[i]),
"pcib") != 0)
continue;
if (legacy_get_pcibus(devs[i]) == busnum)
s = NULL;
}
free(devs, M_TEMP);
}
if (s == NULL)
continue;
/*
* Add at priority 100 to make sure we
* go after any motherboard resources
*/
child = BUS_ADD_CHILD(parent, 100,
"pcib", busnum);
device_set_desc(child, s);
legacy_set_pcibus(child, busnum);
found = 1;
if (id == 0x12258086)
found824xx = 1;
if (id == 0x84c48086)
found_orion = 1;
}
}
if (found824xx && bus == 0) {
bus++;
goto retry;
}
/*
* Make sure we add at least one bridge since some old
* hardware doesn't actually have a host-pci bridge device.
* Note that pci_cfgregopen() thinks we have PCI devices..
*/
if (!found) {
if (bootverbose)
printf(
"legacy_pcib_identify: no bridge found, adding pcib0 anyway\n");
child = BUS_ADD_CHILD(parent, 100, "pcib", 0);
legacy_set_pcibus(child, 0);
}
}
static int
legacy_pcib_probe(device_t dev)
{
if (pci_cfgregopen() == 0)
return ENXIO;
return -100;
}
static int
legacy_pcib_attach(device_t dev)
{
int bus;
bus = pcib_get_bus(dev);
device_add_child(dev, "pci", bus);
return bus_generic_attach(dev);
}
int
legacy_pcib_read_ivar(device_t dev, device_t child, int which,
uintptr_t *result)
{
switch (which) {
case PCIB_IVAR_BUS:
*result = legacy_get_pcibus(dev);
return 0;
}
return ENOENT;
}
int
legacy_pcib_write_ivar(device_t dev, device_t child, int which,
uintptr_t value)
{
switch (which) {
case PCIB_IVAR_BUS:
legacy_set_pcibus(dev, value);
return 0;
}
return ENOENT;
}
static device_method_t legacy_pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, legacy_pcib_identify),
DEVMETHOD(device_probe, legacy_pcib_probe),
DEVMETHOD(device_attach, legacy_pcib_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_read_ivar, legacy_pcib_read_ivar),
DEVMETHOD(bus_write_ivar, legacy_pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, legacy_pcib_maxslots),
DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
DEVMETHOD(pcib_route_interrupt, legacy_pcib_route_interrupt),
{ 0, 0 }
};
static driver_t legacy_pcib_driver = {
"pcib",
legacy_pcib_methods,
1,
};
DRIVER_MODULE(pcib, legacy, legacy_pcib_driver, pcib_devclass, 0, 0);
/*
* Provide a device to "eat" the host->pci bridges that we dug up above
* and stop them showing up twice on the probes. This also stops them
* showing up as 'none' in pciconf -l.
*/
static int
pci_hostb_probe(device_t dev)
{
u_int32_t id;
id = pci_get_devid(dev);
switch (id) {
/* VIA VT82C596 Power Managment Function */
case 0x30501106:
return ENXIO;
default:
break;
}
if (pci_get_class(dev) == PCIC_BRIDGE &&
pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
device_set_desc(dev, "Host to PCI bridge");
device_quiet(dev);
return -10000;
}
return ENXIO;
}
static int
pci_hostb_attach(device_t dev)
{
return 0;
}
static device_method_t pci_hostb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pci_hostb_probe),
DEVMETHOD(device_attach, pci_hostb_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
{ 0, 0 }
};
static driver_t pci_hostb_driver = {
"hostb",
pci_hostb_methods,
1,
};
static devclass_t pci_hostb_devclass;
DRIVER_MODULE(hostb, pci, pci_hostb_driver, pci_hostb_devclass, 0, 0);
/*
* Install placeholder to claim the resources owned by the
* PCI bus interface. This could be used to extract the
* config space registers in the extreme case where the PnP
* ID is available and the PCI BIOS isn't, but for now we just
* eat the PnP ID and do nothing else.
*
* XXX we should silence this probe, as it will generally confuse
* people.
*/
static struct isa_pnp_id pcibus_pnp_ids[] = {
{ 0x030ad041 /* PNP0A03 */, "PCI Bus" },
{ 0 }
};
static int
pcibus_pnp_probe(device_t dev)
{
int result;
if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcibus_pnp_ids)) <= 0)
device_quiet(dev);
return(result);
}
static int
pcibus_pnp_attach(device_t dev)
{
return(0);
}
static device_method_t pcibus_pnp_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pcibus_pnp_probe),
DEVMETHOD(device_attach, pcibus_pnp_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
{ 0, 0 }
};
static driver_t pcibus_pnp_driver = {
"pcibus_pnp",
pcibus_pnp_methods,
1, /* no softc */
};
static devclass_t pcibus_pnp_devclass;
DRIVER_MODULE(pcibus_pnp, isa, pcibus_pnp_driver, pcibus_pnp_devclass, 0, 0);