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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13 * purpose. It is provided "as is" without express or implied
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/resource.h>
76 #include "ofw_bus_if.h"
80 * The nexus (which is a pseudo-bus actually) iterates over the nodes that
81 * exist in Open Firmware and adds them as devices to this bus so that drivers
82 * can be attached to them.
84 * Maybe this code should get into dev/ofw to some extent, as some of it should
85 * work for all Open Firmware based machines...
88 static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");
93 NEXUS_IVAR_DEVICE_TYPE,
94 NEXUS_IVAR_COMPATIBLE,
97 struct nexus_devinfo {
99 /* Some common properties. */
100 const char *ndi_name;
101 const char *ndi_device_type;
102 const char *ndi_compatible;
112 static int nexus_probe(device_t);
113 static int nexus_attach(device_t);
118 static device_t nexus_add_child(device_t, u_int, const char *, int);
119 static void nexus_probe_nomatch(device_t, device_t);
120 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
121 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
122 static int nexus_setup_intr(device_t, device_t, struct resource *, int,
123 driver_filter_t *, driver_intr_t *, void *, void **);
124 static int nexus_teardown_intr(device_t, device_t, struct resource *,
126 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
127 u_long, u_long, u_long, u_int);
128 static int nexus_activate_resource(device_t, device_t, int, int,
130 static int nexus_deactivate_resource(device_t, device_t, int, int,
132 static int nexus_release_resource(device_t, device_t, int, int,
138 static phandle_t nexus_ofw_get_node(device_t, device_t);
139 static const char *nexus_ofw_get_name(device_t, device_t);
140 static const char *nexus_ofw_get_type(device_t, device_t);
141 static const char *nexus_ofw_get_compat(device_t, device_t);
146 static device_t nexus_device_from_node(device_t, phandle_t);
148 static device_method_t nexus_methods[] = {
149 /* Device interface */
150 DEVMETHOD(device_probe, nexus_probe),
151 DEVMETHOD(device_attach, nexus_attach),
152 DEVMETHOD(device_detach, bus_generic_detach),
153 DEVMETHOD(device_shutdown, bus_generic_shutdown),
154 DEVMETHOD(device_suspend, bus_generic_suspend),
155 DEVMETHOD(device_resume, bus_generic_resume),
157 /* Bus interface. Resource management is business of the children... */
158 DEVMETHOD(bus_add_child, nexus_add_child),
159 DEVMETHOD(bus_print_child, bus_generic_print_child),
160 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch),
161 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
162 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
163 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
164 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
165 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
166 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
167 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
168 DEVMETHOD(bus_release_resource, nexus_release_resource),
170 /* OFW bus interface */
171 DEVMETHOD(ofw_bus_get_node, nexus_ofw_get_node),
172 DEVMETHOD(ofw_bus_get_name, nexus_ofw_get_name),
173 DEVMETHOD(ofw_bus_get_type, nexus_ofw_get_type),
174 DEVMETHOD(ofw_bus_get_compat, nexus_ofw_get_compat),
179 static driver_t nexus_driver = {
182 sizeof(struct nexus_softc),
185 static devclass_t nexus_devclass;
187 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
190 nexus_probe(device_t dev)
192 bus_generic_probe(dev);
193 device_set_desc(dev, "Open Firmware Nexus device");
198 nexus_attach(device_t dev)
202 struct nexus_softc *sc;
205 if ((root = OF_peer(0)) == -1)
206 panic("nexus_probe: OF_peer failed.");
208 sc = device_get_softc(dev);
211 end = INTR_VECTORS - 1;
213 sc->sc_rman.rm_start = start;
214 sc->sc_rman.rm_end = end;
215 sc->sc_rman.rm_type = RMAN_ARRAY;
216 sc->sc_rman.rm_descr = "Interrupt request lines";
217 if (rman_init(&sc->sc_rman) ||
218 rman_manage_region(&sc->sc_rman, start, end))
219 panic("nexus_probe IRQ rman");
222 * Now walk the OFW tree to locate top-level devices
224 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
226 panic("nexus_probe(): OF_child failed.");
227 (void)nexus_device_from_node(dev, child);
231 return (bus_generic_attach(dev));
235 nexus_probe_nomatch(device_t dev, device_t child)
239 if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME,
240 (uintptr_t *)&name) != 0 ||
241 BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE,
242 (uintptr_t *)&type) != 0)
249 device_printf(dev, "<%s>, type %s (no driver attached)\n",
254 nexus_add_child(device_t dev, u_int order, const char *name, int unit)
257 struct nexus_devinfo *dinfo;
259 child = device_add_child_ordered(dev, order, name, unit);
263 dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO);
267 dinfo->ndi_node = -1;
268 dinfo->ndi_name = name;
269 device_set_ivars(child, dinfo);
276 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
278 struct nexus_devinfo *dinfo;
280 if ((dinfo = device_get_ivars(child)) == 0)
283 case NEXUS_IVAR_NODE:
284 *result = dinfo->ndi_node;
286 case NEXUS_IVAR_NAME:
287 *result = (uintptr_t)dinfo->ndi_name;
289 case NEXUS_IVAR_DEVICE_TYPE:
290 *result = (uintptr_t)dinfo->ndi_device_type;
292 case NEXUS_IVAR_COMPATIBLE:
293 *result = (uintptr_t)dinfo->ndi_compatible;
302 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
304 struct nexus_devinfo *dinfo;
306 if ((dinfo = device_get_ivars(child)) == 0)
310 case NEXUS_IVAR_NAME:
313 /* Identified devices may want to set these */
314 case NEXUS_IVAR_NODE:
315 dinfo->ndi_node = (phandle_t)value;
318 case NEXUS_IVAR_DEVICE_TYPE:
319 dinfo->ndi_device_type = (char *)value;
329 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
330 driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
335 /* somebody tried to setup an irq that failed to allocate! */
337 panic("nexus_setup_intr: NULL irq resource!");
340 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
343 driver = device_get_driver(child);
346 * We depend here on rman_activate_resource() being idempotent.
348 error = rman_activate_resource(res);
352 error = powerpc_setup_intr(device_get_nameunit(child),
353 rman_get_start(res), filter, ihand, arg, flags, cookiep);
359 nexus_teardown_intr(device_t dev, device_t child, struct resource *res,
363 return (powerpc_teardown_intr(cookie));
367 * Allocate resources at the behest of a child. This only handles interrupts,
368 * since I/O resources are handled by child busses.
370 static struct resource *
371 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
372 u_long start, u_long end, u_long count, u_int flags)
374 struct nexus_softc *sc;
377 if (type != SYS_RES_IRQ) {
378 device_printf(bus, "unknown resource request from %s\n",
379 device_get_nameunit(child));
383 if (count == 0 || start + count - 1 != end) {
384 device_printf(bus, "invalid IRQ allocation from %s\n",
385 device_get_nameunit(child));
389 sc = device_get_softc(bus);
391 rv = rman_reserve_resource(&sc->sc_rman, start, end, count,
394 device_printf(bus, "IRQ allocation failed for %s\n",
395 device_get_nameunit(child));
397 rman_set_rid(rv, *rid);
403 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
404 struct resource *res)
407 /* Not much to be done yet... */
408 return (rman_activate_resource(res));
412 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
413 struct resource *res)
416 /* Not much to be done yet... */
417 return (rman_deactivate_resource(res));
421 nexus_release_resource(device_t bus, device_t child, int type, int rid,
422 struct resource *res)
425 if (type != SYS_RES_IRQ) {
426 device_printf(bus, "unknown resource request from %s\n",
427 device_get_nameunit(child));
431 return (rman_release_resource(res));
435 nexus_device_from_node(device_t parent, phandle_t node)
438 struct nexus_devinfo *dinfo;
439 char *name, *type, *compatible;
441 OF_getprop_alloc(node, "name", 1, (void **)&name);
442 OF_getprop_alloc(node, "device_type", 1, (void **)&type);
443 OF_getprop_alloc(node, "compatible", 1, (void **)&compatible);
444 cdev = device_add_child(parent, NULL, -1);
446 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
447 dinfo->ndi_node = node;
448 dinfo->ndi_name = name;
449 dinfo->ndi_device_type = type;
450 dinfo->ndi_compatible = compatible;
451 device_set_ivars(cdev, dinfo);
453 free(name, M_OFWPROP);
459 nexus_ofw_get_name(device_t bus, device_t dev)
461 struct nexus_devinfo *dinfo;
463 if ((dinfo = device_get_ivars(dev)) == NULL)
466 return (dinfo->ndi_name);
470 nexus_ofw_get_node(device_t bus, device_t dev)
472 struct nexus_devinfo *dinfo;
474 if ((dinfo = device_get_ivars(dev)) == NULL)
477 return (dinfo->ndi_node);
481 nexus_ofw_get_type(device_t bus, device_t dev)
483 struct nexus_devinfo *dinfo;
485 if ((dinfo = device_get_ivars(dev)) == NULL)
488 return (dinfo->ndi_device_type);
492 nexus_ofw_get_compat(device_t bus, device_t dev)
494 struct nexus_devinfo *dinfo;
496 if ((dinfo = device_get_ivars(dev)) == NULL)
499 return (dinfo->ndi_compatible);