2 * Copyright 1998 Massachusetts Institute of Technology
3 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>.
4 * Copyright 2006 by Marius Strobl <marius@FreeBSD.org>.
7 * Permission to use, copy, modify, and distribute this software and
8 * its documentation for any purpose and without fee is hereby
9 * granted, provided that both the above copyright notice and this
10 * permission notice appear in all copies, that both the above
11 * copyright notice and this permission notice appear in all
12 * supporting documentation, and that the name of M.I.T. not be used
13 * in advertising or publicity pertaining to distribution of the
14 * software without specific, written prior permission. M.I.T. makes
15 * no representations about the suitability of this software for any
16 * purpose. It is provided "as is" without express or implied
19 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
20 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
23 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/module.h>
50 #include <dev/ofw/ofw_bus.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52 #include <dev/ofw/openfirm.h>
53 #include <dev/fdt/simplebus.h>
55 #include <machine/bus.h>
56 #include <machine/resource.h>
59 * The ofwbus (which is a pseudo-bus actually) iterates over the nodes that
60 * hang from the Open Firmware root node and adds them as devices to this bus
61 * (except some special nodes which are excluded) so that drivers can be
67 struct simplebus_softc simplebus_sc;
68 struct rman sc_intr_rman;
69 struct rman sc_mem_rman;
72 static device_identify_t ofwbus_identify;
73 static device_probe_t ofwbus_probe;
74 static device_attach_t ofwbus_attach;
75 static bus_alloc_resource_t ofwbus_alloc_resource;
76 static bus_adjust_resource_t ofwbus_adjust_resource;
77 static bus_release_resource_t ofwbus_release_resource;
79 static device_method_t ofwbus_methods[] = {
80 /* Device interface */
81 DEVMETHOD(device_identify, ofwbus_identify),
82 DEVMETHOD(device_probe, ofwbus_probe),
83 DEVMETHOD(device_attach, ofwbus_attach),
86 DEVMETHOD(bus_alloc_resource, ofwbus_alloc_resource),
87 DEVMETHOD(bus_adjust_resource, ofwbus_adjust_resource),
88 DEVMETHOD(bus_release_resource, ofwbus_release_resource),
93 DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods,
94 sizeof(struct ofwbus_softc), simplebus_driver);
95 static devclass_t ofwbus_devclass;
96 EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, ofwbus_devclass, 0, 0,
97 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
98 MODULE_VERSION(ofwbus, 1);
101 ofwbus_identify(driver_t *driver, device_t parent)
104 /* Check if Open Firmware has been instantiated */
105 if (OF_peer(0) == -1)
108 if (device_find_child(parent, "ofwbus", -1) == NULL)
109 BUS_ADD_CHILD(parent, 0, "ofwbus", -1);
113 ofwbus_probe(device_t dev)
116 device_set_desc(dev, "Open Firmware Device Tree");
117 return (BUS_PROBE_NOWILDCARD);
121 ofwbus_attach(device_t dev)
123 struct ofwbus_softc *sc;
125 struct ofw_bus_devinfo obd;
127 sc = device_get_softc(dev);
132 * If no Open Firmware, bail early
138 * ofwbus bus starts on unamed node in FDT, so we cannot make
139 * ofw_bus_devinfo from it. Pass node to simplebus_init directly.
141 simplebus_init(dev, node);
142 sc->sc_intr_rman.rm_type = RMAN_ARRAY;
143 sc->sc_intr_rman.rm_descr = "Interrupts";
144 sc->sc_mem_rman.rm_type = RMAN_ARRAY;
145 sc->sc_mem_rman.rm_descr = "Device Memory";
146 if (rman_init(&sc->sc_intr_rman) != 0 ||
147 rman_init(&sc->sc_mem_rman) != 0 ||
148 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 ||
149 rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0)
150 panic("%s: failed to set up rmans.", __func__);
153 * Allow devices to identify.
155 bus_generic_probe(dev);
158 * Now walk the OFW tree and attach top-level devices.
160 for (node = OF_child(node); node > 0; node = OF_peer(node)) {
161 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0)
163 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
165 return (bus_generic_attach(dev));
168 static struct resource *
169 ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
170 u_long start, u_long end, u_long count, u_int flags)
172 struct ofwbus_softc *sc;
175 struct resource_list_entry *rle;
176 int isdefault, passthrough;
178 isdefault = (start == 0UL && end == ~0UL);
179 passthrough = (device_get_parent(child) != bus);
180 sc = device_get_softc(bus);
182 if (!passthrough && isdefault) {
183 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
187 device_printf(bus, "no default resources for "
188 "rid = %d, type = %d\n", *rid, type);
192 count = ulmax(count, rle->count);
193 end = ulmax(rle->end, start + count - 1);
198 rm = &sc->sc_intr_rman;
201 rm = &sc->sc_mem_rman;
207 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
211 rman_set_rid(rv, *rid);
213 if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type,
215 rman_release_resource(rv);
219 if (!passthrough && rle != NULL) {
221 rle->start = rman_get_start(rv);
222 rle->end = rman_get_end(rv);
223 rle->count = rle->end - rle->start + 1;
230 ofwbus_adjust_resource(device_t bus, device_t child __unused, int type,
231 struct resource *r, u_long start, u_long end)
233 struct ofwbus_softc *sc;
238 while (strcmp(device_get_name(device_get_parent(ofwbus)), "root") != 0)
239 ofwbus = device_get_parent(ofwbus);
240 sc = device_get_softc(ofwbus);
243 rm = &sc->sc_intr_rman;
246 rm = &sc->sc_mem_rman;
253 if (rman_is_region_manager(r, rm) == 0)
255 return (rman_adjust_resource(r, start, end));
259 ofwbus_release_resource(device_t bus, device_t child, int type,
260 int rid, struct resource *r)
262 struct resource_list_entry *rle;
265 /* Clean resource list entry */
266 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), type, rid);
270 if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
271 error = bus_deactivate_resource(child, type, rid, r);
275 return (rman_release_resource(r));