freebsd-skq/sys/powerpc/powermac/grackle.c

280 lines
6.6 KiB
C

/*-
* Copyright 2003 by Peter Grehan. 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. 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/pio.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <powerpc/ofw/ofw_pci.h>
#include <powerpc/powermac/gracklevar.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include "pcib_if.h"
int badaddr(void *, size_t); /* XXX */
/*
* Device interface.
*/
static int grackle_probe(device_t);
static int grackle_attach(device_t);
/*
* pcib interface.
*/
static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int,
u_int, int);
static void grackle_write_config(device_t, u_int, u_int, u_int,
u_int, u_int32_t, int);
/*
* Local routines.
*/
static int grackle_enable_config(struct grackle_softc *, u_int,
u_int, u_int, u_int);
static void grackle_disable_config(struct grackle_softc *);
/*
* Driver methods.
*/
static device_method_t grackle_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, grackle_probe),
DEVMETHOD(device_attach, grackle_attach),
/* pcib interface */
DEVMETHOD(pcib_read_config, grackle_read_config),
DEVMETHOD(pcib_write_config, grackle_write_config),
DEVMETHOD_END
};
static devclass_t grackle_devclass;
DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
sizeof(struct grackle_softc), ofw_pci_driver);
DRIVER_MODULE(grackle, nexus, grackle_driver, grackle_devclass, 0, 0);
static int
grackle_probe(device_t dev)
{
const char *type, *compatible;
type = ofw_bus_get_type(dev);
compatible = ofw_bus_get_compat(dev);
if (type == NULL || compatible == NULL)
return (ENXIO);
if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
return (ENXIO);
device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
return (0);
}
static int
grackle_attach(device_t dev)
{
struct grackle_softc *sc;
sc = device_get_softc(dev);
/*
* The Grackle PCI config addr/data registers are actually in
* PCI space, but since they are needed to actually probe the
* PCI bus, use the fact that they are also available directly
* on the processor bus and map them
*/
sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
return (ofw_pci_attach(dev));
}
static u_int32_t
grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
int width)
{
struct grackle_softc *sc;
vm_offset_t caoff;
u_int32_t retval = 0xffffffff;
sc = device_get_softc(dev);
caoff = sc->sc_data + (reg & 0x03);
if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
/*
* Config probes to non-existent devices on the
* secondary bus generates machine checks. Be sure
* to catch these.
*/
if (bus > 0) {
if (badaddr((void *)sc->sc_data, 4)) {
return (retval);
}
}
switch (width) {
case 1:
retval = (in8rb(caoff));
break;
case 2:
retval = (in16rb(caoff));
break;
case 4:
retval = (in32rb(caoff));
break;
}
}
grackle_disable_config(sc);
return (retval);
}
static void
grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
u_int reg, u_int32_t val, int width)
{
struct grackle_softc *sc;
vm_offset_t caoff;
sc = device_get_softc(dev);
caoff = sc->sc_data + (reg & 0x03);
if (grackle_enable_config(sc, bus, slot, func, reg)) {
switch (width) {
case 1:
out8rb(caoff, val);
(void)in8rb(caoff);
break;
case 2:
out16rb(caoff, val);
(void)in16rb(caoff);
break;
case 4:
out32rb(caoff, val);
(void)in32rb(caoff);
break;
}
}
grackle_disable_config(sc);
}
static int
grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
u_int func, u_int reg)
{
u_int32_t cfgval;
/*
* Unlike UniNorth, the format of the config word is the same
* for local (0) and remote busses.
*/
cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
| GRACKLE_CFG_ENABLE;
out32rb(sc->sc_addr, cfgval);
(void) in32rb(sc->sc_addr);
return (1);
}
static void
grackle_disable_config(struct grackle_softc *sc)
{
/*
* Clear the GRACKLE_CFG_ENABLE bit to prevent stray
* accesses from causing config cycles
*/
out32rb(sc->sc_addr, 0);
}
/*
* Driver to swallow Grackle host bridges from the PCI bus side.
*/
static int
grackle_hb_probe(device_t dev)
{
if (pci_get_devid(dev) == 0x00021057) {
device_set_desc(dev, "Grackle Host to PCI bridge");
device_quiet(dev);
return (0);
}
return (ENXIO);
}
static int
grackle_hb_attach(device_t dev)
{
return (0);
}
static device_method_t grackle_hb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, grackle_hb_probe),
DEVMETHOD(device_attach, grackle_hb_attach),
{ 0, 0 }
};
static driver_t grackle_hb_driver = {
"grackle_hb",
grackle_hb_methods,
1,
};
static devclass_t grackle_hb_devclass;
DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0);