2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright 2003 by Peter Grehan. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/module.h>
38 #include <sys/kernel.h>
42 #include <dev/ofw/openfirm.h>
43 #include <dev/ofw/ofw_pci.h>
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46 #include <dev/ofw/ofwpci.h>
48 #include <dev/pci/pcivar.h>
49 #include <dev/pci/pcireg.h>
51 #include <machine/bus.h>
52 #include <machine/intr_machdep.h>
53 #include <machine/md_var.h>
54 #include <machine/pio.h>
55 #include <machine/resource.h>
57 #include <powerpc/powermac/gracklevar.h>
67 static int grackle_probe(device_t);
68 static int grackle_attach(device_t);
73 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int,
75 static void grackle_write_config(device_t, u_int, u_int, u_int,
76 u_int, u_int32_t, int);
81 static int grackle_enable_config(struct grackle_softc *, u_int,
83 static void grackle_disable_config(struct grackle_softc *);
84 static int badaddr(void *, size_t);
89 static device_method_t grackle_methods[] = {
90 /* Device interface */
91 DEVMETHOD(device_probe, grackle_probe),
92 DEVMETHOD(device_attach, grackle_attach),
95 DEVMETHOD(pcib_read_config, grackle_read_config),
96 DEVMETHOD(pcib_write_config, grackle_write_config),
101 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
102 sizeof(struct grackle_softc), ofw_pcib_driver);
103 DRIVER_MODULE(grackle, ofwbus, grackle_driver, 0, 0);
106 grackle_probe(device_t dev)
108 const char *type, *compatible;
110 type = ofw_bus_get_type(dev);
111 compatible = ofw_bus_get_compat(dev);
113 if (type == NULL || compatible == NULL)
116 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
119 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
124 grackle_attach(device_t dev)
126 struct grackle_softc *sc;
128 sc = device_get_softc(dev);
131 * The Grackle PCI config addr/data registers are actually in
132 * PCI space, but since they are needed to actually probe the
133 * PCI bus, use the fact that they are also available directly
134 * on the processor bus and map them
136 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
137 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
139 return (ofw_pcib_attach(dev));
143 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
146 struct grackle_softc *sc;
148 u_int32_t retval = 0xffffffff;
150 sc = device_get_softc(dev);
151 caoff = sc->sc_data + (reg & 0x03);
153 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
155 * Config probes to non-existent devices on the
156 * secondary bus generates machine checks. Be sure
160 if (badaddr((void *)sc->sc_data, 4)) {
167 retval = (in8rb(caoff));
170 retval = (in16rb(caoff));
173 retval = (in32rb(caoff));
177 grackle_disable_config(sc);
183 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
184 u_int reg, u_int32_t val, int width)
186 struct grackle_softc *sc;
189 sc = device_get_softc(dev);
190 caoff = sc->sc_data + (reg & 0x03);
192 if (grackle_enable_config(sc, bus, slot, func, reg)) {
208 grackle_disable_config(sc);
212 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
213 u_int func, u_int reg)
218 * Unlike UniNorth, the format of the config word is the same
219 * for local (0) and remote busses.
221 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
222 | GRACKLE_CFG_ENABLE;
224 out32rb(sc->sc_addr, cfgval);
225 (void) in32rb(sc->sc_addr);
231 grackle_disable_config(struct grackle_softc *sc)
234 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray
235 * accesses from causing config cycles
237 out32rb(sc->sc_addr, 0);
241 badaddr(void *addr, size_t size)
244 jmp_buf env, *oldfaultbuf;
246 /* Get rid of any stale machine checks that have been waiting. */
247 __asm __volatile ("sync; isync");
251 oldfaultbuf = td->td_pcb->pcb_onfault;
252 td->td_pcb->pcb_onfault = &env;
254 td->td_pcb->pcb_onfault = oldfaultbuf;
255 __asm __volatile ("sync");
259 __asm __volatile ("sync");
263 (void)*(volatile int8_t *)addr;
266 (void)*(volatile int16_t *)addr;
269 (void)*(volatile int32_t *)addr;
272 panic("badaddr: invalid size (%zd)", size);
275 /* Make sure we took the machine check, if we caused one. */
276 __asm __volatile ("sync; isync");
278 td->td_pcb->pcb_onfault = oldfaultbuf;
279 __asm __volatile ("sync"); /* To be sure. */
285 * Driver to swallow Grackle host bridges from the PCI bus side.
288 grackle_hb_probe(device_t dev)
291 if (pci_get_devid(dev) == 0x00021057) {
292 device_set_desc(dev, "Grackle Host to PCI bridge");
301 grackle_hb_attach(device_t dev)
307 static device_method_t grackle_hb_methods[] = {
308 /* Device interface */
309 DEVMETHOD(device_probe, grackle_hb_probe),
310 DEVMETHOD(device_attach, grackle_hb_attach),
314 static driver_t grackle_hb_driver = {
320 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, 0, 0);