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>
53 #include <dev/ofw/ofw_bus.h>
54 #include <dev/ofw/ofw_bus_subr.h>
55 #include <dev/ofw/openfirm.h>
56 #include <dev/fdt/simplebus.h>
58 #include <machine/bus.h>
59 #include <machine/resource.h>
62 * The ofwbus (which is a pseudo-bus actually) iterates over the nodes that
63 * hang from the Open Firmware root node and adds them as devices to this bus
64 * (except some special nodes which are excluded) so that drivers can be
65 * attached to them. There should be only one ofwbus in the system, added
66 * directly as a child of nexus0.
69 static device_probe_t ofwbus_probe;
70 static device_attach_t ofwbus_attach;
71 static bus_alloc_resource_t ofwbus_alloc_resource;
72 static bus_release_resource_t ofwbus_release_resource;
74 static device_method_t ofwbus_methods[] = {
75 /* Device interface */
76 DEVMETHOD(device_probe, ofwbus_probe),
77 DEVMETHOD(device_attach, ofwbus_attach),
80 DEVMETHOD(bus_alloc_resource, ofwbus_alloc_resource),
81 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
82 DEVMETHOD(bus_release_resource, ofwbus_release_resource),
87 DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods,
88 sizeof(struct simplebus_softc), simplebus_driver);
89 static devclass_t ofwbus_devclass;
90 EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, ofwbus_devclass, 0, 0,
91 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
92 MODULE_VERSION(ofwbus, 1);
95 ofwbus_probe(device_t dev)
101 /* Only one instance of ofwbus. */
102 if (device_get_unit(dev) != 0)
103 panic("ofwbus added with non-zero unit number: %d\n",
104 device_get_unit(dev));
106 device_set_desc(dev, "Open Firmware Device Tree");
107 return (BUS_PROBE_NOWILDCARD);
111 ofwbus_attach(device_t dev)
114 struct ofw_bus_devinfo obd;
119 * If no Open Firmware, bail early
125 * ofwbus bus starts on unamed node in FDT, so we cannot make
126 * ofw_bus_devinfo from it. Pass node to simplebus_init directly.
128 simplebus_init(dev, node);
131 * Allow devices to identify.
133 bus_generic_probe(dev);
136 * Now walk the OFW tree and attach top-level devices.
138 for (node = OF_child(node); node > 0; node = OF_peer(node)) {
139 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0)
141 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
142 ofw_bus_gen_destroy_devinfo(&obd);
144 return (bus_generic_attach(dev));
147 static struct resource *
148 ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
149 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
152 struct resource_list_entry *rle;
153 bool isdefault, passthrough;
155 isdefault = RMAN_IS_DEFAULT_RANGE(start, end);
156 passthrough = (device_get_parent(child) != bus);
158 if (!passthrough && isdefault) {
159 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
163 device_printf(bus, "no default resources for "
164 "rid = %d, type = %d\n", *rid, type);
168 count = ummax(count, rle->count);
169 end = ummax(rle->end, start + count - 1);
172 /* Let nexus handle the allocation. */
173 rv = bus_generic_alloc_resource(bus, child, type, rid, start, end,
178 if (!passthrough && rle != NULL) {
180 rle->start = rman_get_start(rv);
181 rle->end = rman_get_end(rv);
182 rle->count = rle->end - rle->start + 1;
189 ofwbus_release_resource(device_t bus, device_t child, int type,
190 int rid, struct resource *r)
192 struct resource_list_entry *rle;
195 passthrough = (device_get_parent(child) != bus);
197 /* Clean resource list entry */
198 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
204 /* Let nexus handle the release. */
205 return (bus_generic_release_resource(bus, child, type, rid, r));