2 * Copyright 1998 Massachusetts Institute of Technology
4 * Permission to use, copy, modify, and distribute this software and
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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10 * in advertising or publicity pertaining to distribution of the
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16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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
39 * documentation and/or other materials provided with the distribution.
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
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/openfirm.h>
69 #include <machine/bus.h>
70 #include <machine/frame.h>
71 #include <machine/intr_machdep.h>
72 #include <machine/nexusvar.h>
73 #include <machine/resource.h>
77 #include "ofw_bus_if.h"
81 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
82 * exist in Open Firmware and adds them as devices to this bus so that drivers
83 * can be attached to them.
85 * Maybe this code should get into dev/ofw to some extent, as some of it should
86 * work for all Open Firmware based machines...
89 static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");
91 struct nexus_devinfo {
93 /* Some common properties. */
95 const char *ndi_device_type;
96 const char *ndi_compatible;
106 static int nexus_probe(device_t);
107 static void nexus_probe_nomatch(device_t, device_t);
112 static device_t nexus_add_child(device_t, int, const char *, int);
113 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
114 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
115 static int nexus_setup_intr(device_t, device_t, struct resource *, int,
116 driver_filter_t *, driver_intr_t *, void *, void **);
117 static int nexus_teardown_intr(device_t, device_t, struct resource *,
119 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
120 u_long, u_long, u_long, u_int);
121 static int nexus_activate_resource(device_t, device_t, int, int,
123 static int nexus_deactivate_resource(device_t, device_t, int, int,
125 static int nexus_release_resource(device_t, device_t, int, int,
128 static phandle_t nexus_ofw_get_node(device_t, device_t);
129 static const char *nexus_ofw_get_name(device_t, device_t);
130 static const char *nexus_ofw_get_type(device_t, device_t);
131 static const char *nexus_ofw_get_compat(device_t, device_t);
136 static device_t nexus_device_from_node(device_t, phandle_t);
138 static device_method_t nexus_methods[] = {
139 /* Device interface */
140 DEVMETHOD(device_probe, nexus_probe),
141 DEVMETHOD(device_attach, bus_generic_attach),
142 DEVMETHOD(device_detach, bus_generic_detach),
143 DEVMETHOD(device_shutdown, bus_generic_shutdown),
144 DEVMETHOD(device_suspend, bus_generic_suspend),
145 DEVMETHOD(device_resume, bus_generic_resume),
147 /* Bus interface. Resource management is business of the children... */
148 DEVMETHOD(bus_add_child, nexus_add_child),
149 DEVMETHOD(bus_print_child, bus_generic_print_child),
150 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch),
151 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
152 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
153 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
154 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
155 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
156 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
157 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
158 DEVMETHOD(bus_release_resource, nexus_release_resource),
160 /* OFW bus interface */
161 DEVMETHOD(ofw_bus_get_node, nexus_ofw_get_node),
162 DEVMETHOD(ofw_bus_get_name, nexus_ofw_get_name),
163 DEVMETHOD(ofw_bus_get_type, nexus_ofw_get_type),
164 DEVMETHOD(ofw_bus_get_compat, nexus_ofw_get_compat),
169 static driver_t nexus_driver = {
172 sizeof(struct nexus_softc),
175 static devclass_t nexus_devclass;
177 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
180 nexus_probe(device_t dev)
184 struct nexus_softc *sc;
187 if ((root = OF_peer(0)) == -1)
188 panic("nexus_probe: OF_peer failed.");
190 sc = device_get_softc(dev);
193 end = INTR_VECTORS - 1;
195 sc->sc_rman.rm_start = start;
196 sc->sc_rman.rm_end = end;
197 sc->sc_rman.rm_type = RMAN_ARRAY;
198 sc->sc_rman.rm_descr = "Interrupt request lines";
199 if (rman_init(&sc->sc_rman) ||
200 rman_manage_region(&sc->sc_rman, start, end))
201 panic("nexus_probe IRQ rman");
204 * Allow devices to identify
206 bus_generic_probe(dev);
209 * Now walk the OFW tree to locate top-level devices
211 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
213 panic("nexus_probe(): OF_child failed.");
214 (void)nexus_device_from_node(dev, child);
217 device_set_desc(dev, "Open Firmware Nexus device");
222 nexus_probe_nomatch(device_t dev, device_t child)
226 if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME,
227 (uintptr_t *)&name) != 0 ||
228 BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE,
229 (uintptr_t *)&type) != 0)
236 device_printf(dev, "<%s>, type %s (no driver attached)\n",
241 nexus_add_child(device_t dev, int order, const char *name, int unit)
244 struct nexus_devinfo *dinfo;
246 child = device_add_child_ordered(dev, order, name, unit);
250 dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO);
254 dinfo->ndi_node = -1;
255 dinfo->ndi_name = name;
256 device_set_ivars(child, dinfo);
263 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
265 struct nexus_devinfo *dinfo;
267 if ((dinfo = device_get_ivars(child)) == 0)
270 case NEXUS_IVAR_NODE:
271 *result = dinfo->ndi_node;
273 case NEXUS_IVAR_NAME:
274 *result = (uintptr_t)dinfo->ndi_name;
276 case NEXUS_IVAR_DEVICE_TYPE:
277 *result = (uintptr_t)dinfo->ndi_device_type;
279 case NEXUS_IVAR_COMPATIBLE:
280 *result = (uintptr_t)dinfo->ndi_compatible;
289 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
291 struct nexus_devinfo *dinfo;
293 if ((dinfo = device_get_ivars(child)) == 0)
297 case NEXUS_IVAR_NAME:
300 /* Identified devices may want to set these */
301 case NEXUS_IVAR_NODE:
302 dinfo->ndi_node = (phandle_t)value;
305 case NEXUS_IVAR_DEVICE_TYPE:
306 dinfo->ndi_device_type = (char *)value;
316 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
317 driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
322 /* somebody tried to setup an irq that failed to allocate! */
324 panic("nexus_setup_intr: NULL irq resource!");
327 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
330 driver = device_get_driver(child);
333 * We depend here on rman_activate_resource() being idempotent.
335 error = rman_activate_resource(res);
339 error = powerpc_setup_intr(device_get_nameunit(child),
340 rman_get_start(res), filter, ihand, arg, flags, cookiep);
346 nexus_teardown_intr(device_t dev, device_t child, struct resource *res,
350 return (powerpc_teardown_intr(cookie));
354 * Allocate resources at the behest of a child. This only handles interrupts,
355 * since I/O resources are handled by child busses.
357 static struct resource *
358 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
359 u_long start, u_long end, u_long count, u_int flags)
361 struct nexus_softc *sc;
364 if (type != SYS_RES_IRQ) {
365 device_printf(bus, "unknown resource request from %s\n",
366 device_get_nameunit(child));
370 if (count == 0 || start + count - 1 != end) {
371 device_printf(bus, "invalid IRQ allocation from %s\n",
372 device_get_nameunit(child));
376 sc = device_get_softc(bus);
378 rv = rman_reserve_resource(&sc->sc_rman, start, end, count,
381 device_printf(bus, "IRQ allocation failed for %s\n",
382 device_get_nameunit(child));
384 rman_set_rid(rv, *rid);
390 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
391 struct resource *res)
394 /* Not much to be done yet... */
395 return (rman_activate_resource(res));
399 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
400 struct resource *res)
403 /* Not much to be done yet... */
404 return (rman_deactivate_resource(res));
408 nexus_release_resource(device_t bus, device_t child, int type, int rid,
409 struct resource *res)
412 if (type != SYS_RES_IRQ) {
413 device_printf(bus, "unknown resource request from %s\n",
414 device_get_nameunit(child));
418 return (rman_release_resource(res));
422 nexus_device_from_node(device_t parent, phandle_t node)
425 struct nexus_devinfo *dinfo;
426 char *name, *type, *compatible;
428 OF_getprop_alloc(node, "name", 1, (void **)&name);
429 OF_getprop_alloc(node, "device_type", 1, (void **)&type);
430 OF_getprop_alloc(node, "compatible", 1, (void **)&compatible);
431 cdev = device_add_child(parent, NULL, -1);
433 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
434 dinfo->ndi_node = node;
435 dinfo->ndi_name = name;
436 dinfo->ndi_device_type = type;
437 dinfo->ndi_compatible = compatible;
438 device_set_ivars(cdev, dinfo);
440 free(name, M_OFWPROP);
446 nexus_ofw_get_name(device_t bus, device_t dev)
448 struct nexus_devinfo *dinfo;
450 if ((dinfo = device_get_ivars(dev)) == NULL)
453 return (dinfo->ndi_name);
457 nexus_ofw_get_node(device_t bus, device_t dev)
459 struct nexus_devinfo *dinfo;
461 if ((dinfo = device_get_ivars(dev)) == NULL)
464 return (dinfo->ndi_node);
468 nexus_ofw_get_type(device_t bus, device_t dev)
470 struct nexus_devinfo *dinfo;
472 if ((dinfo = device_get_ivars(dev)) == NULL)
475 return (dinfo->ndi_device_type);
479 nexus_ofw_get_compat(device_t bus, device_t dev)
481 struct nexus_devinfo *dinfo;
483 if ((dinfo = device_get_ivars(dev)) == NULL)
486 return (dinfo->ndi_compatible);