2 * Copyright 1998 Massachusetts Institute of Technology
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5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
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18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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30 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. All rights reserved.
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
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41 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
56 #include <sys/cdefs.h>
57 __FBSDID("$FreeBSD$");
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/module.h>
64 #include <sys/kernel.h>
65 #include <sys/malloc.h>
67 #include <dev/ofw/ofw_bus.h>
68 #include <dev/ofw/ofw_bus_subr.h>
69 #include <dev/ofw/openfirm.h>
71 #include <machine/bus.h>
72 #include <machine/frame.h>
73 #include <machine/intr_machdep.h>
74 #include <machine/resource.h>
78 #include "ofw_bus_if.h"
82 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
83 * exist in Open Firmware and adds them as devices to this bus so that drivers
84 * can be attached to them.
86 * Maybe this code should get into dev/ofw to some extent, as some of it should
87 * work for all Open Firmware based machines...
90 static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");
92 struct nexus_devinfo {
93 struct ofw_bus_devinfo ndi_ofwinfo;
103 static int nexus_probe(device_t);
104 static int nexus_attach(device_t);
109 static device_t nexus_add_child(device_t, u_int, const char *, int);
110 static void nexus_probe_nomatch(device_t, device_t);
112 static int nexus_bind_intr(device_t dev, device_t child,
113 struct resource *irq, int cpu);
115 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
116 enum intr_polarity pol);
117 static int nexus_setup_intr(device_t, device_t, struct resource *, int,
118 driver_filter_t *, driver_intr_t *, void *, void **);
119 static int nexus_teardown_intr(device_t, device_t, struct resource *,
121 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
122 u_long, u_long, u_long, u_int);
123 static int nexus_activate_resource(device_t, device_t, int, int,
125 static int nexus_deactivate_resource(device_t, device_t, int, int,
127 static int nexus_release_resource(device_t, device_t, int, int,
129 static const struct ofw_bus_devinfo *nexus_get_devinfo(device_t dev,
135 static device_t nexus_device_from_node(device_t, phandle_t);
137 static device_method_t nexus_methods[] = {
138 /* Device interface */
139 DEVMETHOD(device_probe, nexus_probe),
140 DEVMETHOD(device_attach, nexus_attach),
141 DEVMETHOD(device_detach, bus_generic_detach),
142 DEVMETHOD(device_shutdown, bus_generic_shutdown),
143 DEVMETHOD(device_suspend, bus_generic_suspend),
144 DEVMETHOD(device_resume, bus_generic_resume),
146 /* Bus interface. Resource management is business of the children... */
147 DEVMETHOD(bus_add_child, nexus_add_child),
148 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
149 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch),
150 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
151 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
153 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
155 DEVMETHOD(bus_config_intr, nexus_config_intr),
156 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
157 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
158 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
159 DEVMETHOD(bus_release_resource, nexus_release_resource),
161 /* OFW bus interface */
162 DEVMETHOD(ofw_bus_get_devinfo, nexus_get_devinfo),
163 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
164 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
165 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
166 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
167 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
172 static driver_t nexus_driver = {
175 sizeof(struct nexus_softc),
178 static devclass_t nexus_devclass;
180 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
184 nexus_probe(device_t dev)
186 bus_generic_probe(dev);
187 device_set_desc(dev, "Open Firmware Nexus device");
192 nexus_attach(device_t dev)
196 struct nexus_softc *sc;
199 sc = device_get_softc(dev);
204 sc->sc_rman.rm_start = start;
205 sc->sc_rman.rm_end = end;
206 sc->sc_rman.rm_type = RMAN_ARRAY;
207 sc->sc_rman.rm_descr = "Interrupt request lines";
208 if (rman_init(&sc->sc_rman) ||
209 rman_manage_region(&sc->sc_rman, start, end))
210 panic("nexus_probe IRQ rman");
212 if ((root = OF_peer(0)) == 0)
213 return (bus_generic_attach(dev));
216 * Now walk the OFW tree to locate top-level devices
218 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
220 panic("nexus_probe(): OF_child failed.");
221 (void)nexus_device_from_node(dev, child);
225 return (bus_generic_attach(dev));
229 nexus_probe_nomatch(device_t dev, device_t child)
231 const char *name, *type;
233 name = ofw_bus_get_name(child);
234 type = ofw_bus_get_type(child);
242 device_printf(dev, "<%s>, type %s (no driver attached)\n",
247 nexus_add_child(device_t dev, u_int order, const char *name, int unit)
250 struct nexus_devinfo *dinfo;
252 child = device_add_child_ordered(dev, order, name, unit);
256 dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO);
260 dinfo->ndi_ofwinfo.obd_node = -1;
261 dinfo->ndi_ofwinfo.obd_name = NULL;
262 dinfo->ndi_ofwinfo.obd_compat = NULL;
263 dinfo->ndi_ofwinfo.obd_type = NULL;
264 dinfo->ndi_ofwinfo.obd_model = NULL;
266 device_set_ivars(child, dinfo);
272 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
273 driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
277 /* somebody tried to setup an irq that failed to allocate! */
279 panic("nexus_setup_intr: NULL irq resource!");
282 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
286 * We depend here on rman_activate_resource() being idempotent.
288 error = rman_activate_resource(res);
292 error = powerpc_setup_intr(device_get_nameunit(child),
293 rman_get_start(res), filter, ihand, arg, flags, cookiep);
299 nexus_teardown_intr(device_t dev, device_t child, struct resource *res,
303 return (powerpc_teardown_intr(cookie));
308 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
311 return (powerpc_bind_intr(rman_get_start(irq), cpu));
316 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
317 enum intr_polarity pol)
320 return (powerpc_config_intr(irq, trig, pol));
324 * Allocate resources at the behest of a child. This only handles interrupts,
325 * since I/O resources are handled by child busses.
327 static struct resource *
328 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
329 u_long start, u_long end, u_long count, u_int flags)
331 struct nexus_softc *sc;
334 if (type != SYS_RES_IRQ) {
335 device_printf(bus, "unknown resource request from %s\n",
336 device_get_nameunit(child));
340 if (count == 0 || start + count - 1 != end) {
341 device_printf(bus, "invalid IRQ allocation from %s\n",
342 device_get_nameunit(child));
346 sc = device_get_softc(bus);
348 rv = rman_reserve_resource(&sc->sc_rman, start, end, count,
351 device_printf(bus, "IRQ allocation failed for %s\n",
352 device_get_nameunit(child));
354 rman_set_rid(rv, *rid);
360 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
361 struct resource *res)
364 /* Not much to be done yet... */
365 return (rman_activate_resource(res));
369 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
370 struct resource *res)
373 /* Not much to be done yet... */
374 return (rman_deactivate_resource(res));
378 nexus_release_resource(device_t bus, device_t child, int type, int rid,
379 struct resource *res)
382 if (type != SYS_RES_IRQ) {
383 device_printf(bus, "unknown resource request from %s\n",
384 device_get_nameunit(child));
388 return (rman_release_resource(res));
392 nexus_device_from_node(device_t parent, phandle_t node)
395 struct nexus_devinfo *dinfo;
397 cdev = device_add_child(parent, NULL, -1);
399 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
400 ofw_bus_gen_setup_devinfo(&dinfo->ndi_ofwinfo, node);
401 device_set_ivars(cdev, dinfo);
407 static const struct ofw_bus_devinfo *
408 nexus_get_devinfo(device_t dev, device_t child)
410 struct nexus_devinfo *dinfo;
412 dinfo = device_get_ivars(child);
413 return (&dinfo->ndi_ofwinfo);