71e3c3083b
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326 lines
7.5 KiB
C
326 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright 2003 by Peter Grehan. 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 ``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,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/rman.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_pci.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/ofwpci.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 <machine/intr_machdep.h>
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#include <machine/md_var.h>
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#include <machine/pio.h>
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#include <machine/resource.h>
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#include <powerpc/powermac/gracklevar.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include "pcib_if.h"
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/*
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* Device interface.
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*/
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static int grackle_probe(device_t);
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static int grackle_attach(device_t);
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/*
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* pcib interface.
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*/
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static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int,
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u_int, int);
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static void grackle_write_config(device_t, u_int, u_int, u_int,
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u_int, u_int32_t, int);
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/*
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* Local routines.
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*/
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static int grackle_enable_config(struct grackle_softc *, u_int,
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u_int, u_int, u_int);
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static void grackle_disable_config(struct grackle_softc *);
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static int badaddr(void *, size_t);
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/*
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* Driver methods.
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*/
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static device_method_t grackle_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, grackle_probe),
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DEVMETHOD(device_attach, grackle_attach),
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/* pcib interface */
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DEVMETHOD(pcib_read_config, grackle_read_config),
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DEVMETHOD(pcib_write_config, grackle_write_config),
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DEVMETHOD_END
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};
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static devclass_t grackle_devclass;
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DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
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sizeof(struct grackle_softc), ofw_pci_driver);
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DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0);
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static int
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grackle_probe(device_t dev)
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{
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const char *type, *compatible;
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type = ofw_bus_get_type(dev);
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compatible = ofw_bus_get_compat(dev);
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if (type == NULL || compatible == NULL)
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return (ENXIO);
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if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
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return (ENXIO);
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device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
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return (0);
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}
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static int
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grackle_attach(device_t dev)
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{
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struct grackle_softc *sc;
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sc = device_get_softc(dev);
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/*
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* The Grackle PCI config addr/data registers are actually in
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* PCI space, but since they are needed to actually probe the
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* PCI bus, use the fact that they are also available directly
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* on the processor bus and map them
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*/
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sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
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sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
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return (ofw_pci_attach(dev));
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}
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static u_int32_t
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grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
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int width)
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{
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struct grackle_softc *sc;
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vm_offset_t caoff;
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u_int32_t retval = 0xffffffff;
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sc = device_get_softc(dev);
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caoff = sc->sc_data + (reg & 0x03);
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if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
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/*
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* Config probes to non-existent devices on the
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* secondary bus generates machine checks. Be sure
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* to catch these.
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*/
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if (bus > 0) {
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if (badaddr((void *)sc->sc_data, 4)) {
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return (retval);
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}
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}
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switch (width) {
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case 1:
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retval = (in8rb(caoff));
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break;
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case 2:
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retval = (in16rb(caoff));
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break;
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case 4:
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retval = (in32rb(caoff));
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break;
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}
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}
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grackle_disable_config(sc);
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return (retval);
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}
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static void
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grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
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u_int reg, u_int32_t val, int width)
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{
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struct grackle_softc *sc;
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vm_offset_t caoff;
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sc = device_get_softc(dev);
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caoff = sc->sc_data + (reg & 0x03);
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if (grackle_enable_config(sc, bus, slot, func, reg)) {
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switch (width) {
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case 1:
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out8rb(caoff, val);
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(void)in8rb(caoff);
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break;
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case 2:
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out16rb(caoff, val);
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(void)in16rb(caoff);
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break;
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case 4:
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out32rb(caoff, val);
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(void)in32rb(caoff);
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break;
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}
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}
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grackle_disable_config(sc);
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}
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static int
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grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
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u_int func, u_int reg)
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{
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u_int32_t cfgval;
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/*
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* Unlike UniNorth, the format of the config word is the same
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* for local (0) and remote busses.
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*/
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cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
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| GRACKLE_CFG_ENABLE;
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out32rb(sc->sc_addr, cfgval);
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(void) in32rb(sc->sc_addr);
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return (1);
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}
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static void
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grackle_disable_config(struct grackle_softc *sc)
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{
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/*
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* Clear the GRACKLE_CFG_ENABLE bit to prevent stray
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* accesses from causing config cycles
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*/
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out32rb(sc->sc_addr, 0);
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}
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static int
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badaddr(void *addr, size_t size)
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{
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struct thread *td;
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jmp_buf env, *oldfaultbuf;
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int x;
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/* Get rid of any stale machine checks that have been waiting. */
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__asm __volatile ("sync; isync");
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td = curthread;
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oldfaultbuf = td->td_pcb->pcb_onfault;
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td->td_pcb->pcb_onfault = &env;
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if (setjmp(env)) {
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td->td_pcb->pcb_onfault = oldfaultbuf;
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__asm __volatile ("sync");
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return 1;
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}
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__asm __volatile ("sync");
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switch (size) {
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case 1:
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x = *(volatile int8_t *)addr;
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break;
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case 2:
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x = *(volatile int16_t *)addr;
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break;
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case 4:
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x = *(volatile int32_t *)addr;
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break;
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default:
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panic("badaddr: invalid size (%zd)", size);
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}
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/* Make sure we took the machine check, if we caused one. */
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__asm __volatile ("sync; isync");
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td->td_pcb->pcb_onfault = oldfaultbuf;
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__asm __volatile ("sync"); /* To be sure. */
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return (0);
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}
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/*
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* Driver to swallow Grackle host bridges from the PCI bus side.
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*/
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static int
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grackle_hb_probe(device_t dev)
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{
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if (pci_get_devid(dev) == 0x00021057) {
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device_set_desc(dev, "Grackle Host to PCI bridge");
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device_quiet(dev);
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return (0);
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}
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return (ENXIO);
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}
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static int
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grackle_hb_attach(device_t dev)
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{
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return (0);
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}
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static device_method_t grackle_hb_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, grackle_hb_probe),
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DEVMETHOD(device_attach, grackle_hb_attach),
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{ 0, 0 }
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};
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static driver_t grackle_hb_driver = {
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"grackle_hb",
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grackle_hb_methods,
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1,
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};
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static devclass_t grackle_hb_devclass;
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DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0);
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