1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
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
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
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
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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
27 * SUCH DAMAGE.
28 */
29 /*-
30 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
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.
40 *
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
51 * SUCH DAMAGE.
52 *
53 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
54 */
55
56 #include <sys/cdefs.h>
57 __FBSDID("$FreeBSD$");
58
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/module.h>
62 #include <sys/bus.h>
63 #include <sys/cons.h>
64 #include <sys/kernel.h>
65 #include <sys/malloc.h>
66
67 #include <dev/ofw/ofw_bus_subr.h>
68 #include <dev/ofw/openfirm.h>
69
70 #include <machine/bus.h>
71 #include <machine/frame.h>
72 #include <machine/intr_machdep.h>
73 #include <machine/resource.h>
74
75 #include <sys/rman.h>
76
77 #include "ofw_bus_if.h"
78 #include "pic_if.h"
79
80 /*
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.
84 *
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...
87 */
88
89 static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information");
90
91 enum nexus_ivars {
92 NEXUS_IVAR_NODE,
93 NEXUS_IVAR_NAME,
94 NEXUS_IVAR_DEVICE_TYPE,
95 NEXUS_IVAR_COMPATIBLE,
96 };
97
98 struct nexus_devinfo {
99 phandle_t ndi_node;
100 /* Some common properties. */
101 const char *ndi_name;
102 const char *ndi_device_type;
103 const char *ndi_compatible;
104 };
105
106 struct nexus_softc {
107 struct rman sc_rman;
108 };
109
110 /*
111 * Device interface
112 */
113 static int nexus_probe(device_t);
114 static int nexus_attach(device_t);
115
116 /*
117 * Bus interface
118 */
119 static device_t nexus_add_child(device_t, u_int, const char *, int);
120 static void nexus_probe_nomatch(device_t, device_t);
121 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *);
122 static int nexus_write_ivar(device_t, device_t, int, uintptr_t);
123 #ifdef SMP
124 static int nexus_bind_intr(device_t dev, device_t child,
125 struct resource *irq, int cpu);
126 #endif
127 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
128 enum intr_polarity pol);
129 static int nexus_setup_intr(device_t, device_t, struct resource *, int,
130 driver_filter_t *, driver_intr_t *, void *, void **);
131 static int nexus_teardown_intr(device_t, device_t, struct resource *,
132 void *);
133 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
134 u_long, u_long, u_long, u_int);
135 static int nexus_activate_resource(device_t, device_t, int, int,
136 struct resource *);
137 static int nexus_deactivate_resource(device_t, device_t, int, int,
138 struct resource *);
139 static int nexus_release_resource(device_t, device_t, int, int,
140 struct resource *);
141
142 /*
143 * OFW bus interface.
144 */
145 static phandle_t nexus_ofw_get_node(device_t, device_t);
146 static const char *nexus_ofw_get_name(device_t, device_t);
147 static const char *nexus_ofw_get_type(device_t, device_t);
148 static const char *nexus_ofw_get_compat(device_t, device_t);
149
150 /*
151 * Local routines
152 */
153 static device_t nexus_device_from_node(device_t, phandle_t);
154
155 static device_method_t nexus_methods[] = {
156 /* Device interface */
157 DEVMETHOD(device_probe, nexus_probe),
158 DEVMETHOD(device_attach, nexus_attach),
159 DEVMETHOD(device_detach, bus_generic_detach),
160 DEVMETHOD(device_shutdown, bus_generic_shutdown),
161 DEVMETHOD(device_suspend, bus_generic_suspend),
162 DEVMETHOD(device_resume, bus_generic_resume),
163
164 /* Bus interface. Resource management is business of the children... */
165 DEVMETHOD(bus_add_child, nexus_add_child),
166 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
167 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch),
168 DEVMETHOD(bus_read_ivar, nexus_read_ivar),
169 DEVMETHOD(bus_write_ivar, nexus_write_ivar),
170 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
171 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
172 #ifdef SMP
173 DEVMETHOD(bus_bind_intr, nexus_bind_intr),
174 #endif
175 DEVMETHOD(bus_config_intr, nexus_config_intr),
176 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
177 DEVMETHOD(bus_activate_resource, nexus_activate_resource),
178 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
179 DEVMETHOD(bus_release_resource, nexus_release_resource),
180
181 /* OFW bus interface */
182 DEVMETHOD(ofw_bus_get_node, nexus_ofw_get_node),
183 DEVMETHOD(ofw_bus_get_name, nexus_ofw_get_name),
184 DEVMETHOD(ofw_bus_get_type, nexus_ofw_get_type),
185 DEVMETHOD(ofw_bus_get_compat, nexus_ofw_get_compat),
186
187 DEVMETHOD_END
188 };
189
190 static driver_t nexus_driver = {
191 "nexus",
192 nexus_methods,
193 sizeof(struct nexus_softc),
194 };
195
196 static devclass_t nexus_devclass;
197
198 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
199
200 static int
201 nexus_probe(device_t dev)
202 {
203 bus_generic_probe(dev);
204 device_set_desc(dev, "Open Firmware Nexus device");
205 return (0);
206 }
207
208 static int
209 nexus_attach(device_t dev)
210 {
211 phandle_t root;
212 phandle_t child;
213 struct nexus_softc *sc;
214 u_long start, end;
215
216 sc = device_get_softc(dev);
217
218 start = 0;
219 end = MAX_PICS*INTR_VECTORS - 1;
220
221 sc->sc_rman.rm_start = start;
222 sc->sc_rman.rm_end = end;
223 sc->sc_rman.rm_type = RMAN_ARRAY;
224 sc->sc_rman.rm_descr = "Interrupt request lines";
225 if (rman_init(&sc->sc_rman) ||
226 rman_manage_region(&sc->sc_rman, start, end))
227 panic("nexus_probe IRQ rman");
228
229 if ((root = OF_peer(0)) == 0)
230 return (bus_generic_attach(dev));
231
232 /*
233 * Now walk the OFW tree to locate top-level devices
234 */
235 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
236 if (child == -1)
237 panic("nexus_probe(): OF_child failed.");
238 (void)nexus_device_from_node(dev, child);
239
240 }
241
242 return (bus_generic_attach(dev));
243 }
244
245 static void
246 nexus_probe_nomatch(device_t dev, device_t child)
247 {
248 char *name, *type;
249
250 if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME,
251 (uintptr_t *)&name) != 0 ||
252 BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE,
253 (uintptr_t *)&type) != 0)
254 return;
255
256 if (type == NULL)
257 type = "(unknown)";
258
259 if (bootverbose)
260 device_printf(dev, "<%s>, type %s (no driver attached)\n",
261 name, type);
262 }
263
264 static device_t
265 nexus_add_child(device_t dev, u_int order, const char *name, int unit)
266 {
267 device_t child;
268 struct nexus_devinfo *dinfo;
269
270 child = device_add_child_ordered(dev, order, name, unit);
271 if (child == NULL)
272 return (NULL);
273
274 dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO);
275 if (dinfo == NULL)
276 return (NULL);
277
278 dinfo->ndi_node = -1;
279 dinfo->ndi_name = name;
280 device_set_ivars(child, dinfo);
281
282 return (child);
283 }
284
285
286 static int
287 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
288 {
289 struct nexus_devinfo *dinfo;
290
291 if ((dinfo = device_get_ivars(child)) == 0)
292 return (ENOENT);
293 switch (which) {
294 case NEXUS_IVAR_NODE:
295 *result = dinfo->ndi_node;
296 break;
297 case NEXUS_IVAR_NAME:
298 *result = (uintptr_t)dinfo->ndi_name;
299 break;
300 case NEXUS_IVAR_DEVICE_TYPE:
301 *result = (uintptr_t)dinfo->ndi_device_type;
302 break;
303 case NEXUS_IVAR_COMPATIBLE:
304 *result = (uintptr_t)dinfo->ndi_compatible;
305 break;
306 default:
307 return (ENOENT);
308 }
309 return 0;
310 }
311
312 static int
313 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
314 {
315 struct nexus_devinfo *dinfo;
316
317 if ((dinfo = device_get_ivars(child)) == 0)
318 return (ENOENT);
319
320 switch (which) {
321 case NEXUS_IVAR_NAME:
322 return (EINVAL);
323
324 /* Identified devices may want to set these */
325 case NEXUS_IVAR_NODE:
326 dinfo->ndi_node = (phandle_t)value;
327 break;
328
329 case NEXUS_IVAR_DEVICE_TYPE:
330 dinfo->ndi_device_type = (char *)value;
331 break;
332
333 default:
334 return (ENOENT);
335 }
336 return 0;
337 }
338
339 static int
340 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
341 driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
342 {
343 int error;
344
345 /* somebody tried to setup an irq that failed to allocate! */
346 if (res == NULL)
347 panic("nexus_setup_intr: NULL irq resource!");
348
349 *cookiep = 0;
350 if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
351 flags |= INTR_EXCL;
352
353 /*
354 * We depend here on rman_activate_resource() being idempotent.
355 */
356 error = rman_activate_resource(res);
357 if (error)
358 return (error);
359
360 error = powerpc_setup_intr(device_get_nameunit(child),
361 rman_get_start(res), filter, ihand, arg, flags, cookiep);
362
363 return (error);
364 }
365
366 static int
367 nexus_teardown_intr(device_t dev, device_t child, struct resource *res,
368 void *cookie)
369 {
370
371 return (powerpc_teardown_intr(cookie));
372 }
373
374 #ifdef SMP
375 static int
376 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
377 {
378
379 return (powerpc_bind_intr(rman_get_start(irq), cpu));
380 }
381 #endif
382
383 static int
384 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
385 enum intr_polarity pol)
386 {
387
388 return (powerpc_config_intr(irq, trig, pol));
389 }
390
391 /*
392 * Allocate resources at the behest of a child. This only handles interrupts,
393 * since I/O resources are handled by child busses.
394 */
395 static struct resource *
396 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
397 u_long start, u_long end, u_long count, u_int flags)
398 {
399 struct nexus_softc *sc;
400 struct resource *rv;
401
402 if (type != SYS_RES_IRQ) {
403 device_printf(bus, "unknown resource request from %s\n",
404 device_get_nameunit(child));
405 return (NULL);
406 }
407
408 if (count == 0 || start + count - 1 != end) {
409 device_printf(bus, "invalid IRQ allocation from %s\n",
410 device_get_nameunit(child));
411 return (NULL);
412 }
413
414 sc = device_get_softc(bus);
415
416 rv = rman_reserve_resource(&sc->sc_rman, start, end, count,
417 flags, child);
418 if (rv == NULL) {
419 device_printf(bus, "IRQ allocation failed for %s\n",
420 device_get_nameunit(child));
421 } else
422 rman_set_rid(rv, *rid);
423
424 return (rv);
425 }
426
427 static int
428 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
429 struct resource *res)
430 {
431
432 /* Not much to be done yet... */
433 return (rman_activate_resource(res));
434 }
435
436 static int
437 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
438 struct resource *res)
439 {
440
441 /* Not much to be done yet... */
442 return (rman_deactivate_resource(res));
443 }
444
445 static int
446 nexus_release_resource(device_t bus, device_t child, int type, int rid,
447 struct resource *res)
448 {
449
450 if (type != SYS_RES_IRQ) {
451 device_printf(bus, "unknown resource request from %s\n",
452 device_get_nameunit(child));
453 return (EINVAL);
454 }
455
456 return (rman_release_resource(res));
457 }
458
459 static device_t
460 nexus_device_from_node(device_t parent, phandle_t node)
461 {
462 device_t cdev;
463 struct nexus_devinfo *dinfo;
464 char *name, *type, *compatible;
465
466 OF_getprop_alloc(node, "name", 1, (void **)&name);
467 OF_getprop_alloc(node, "device_type", 1, (void **)&type);
468 OF_getprop_alloc(node, "compatible", 1, (void **)&compatible);
469 cdev = device_add_child(parent, NULL, -1);
470 if (cdev != NULL) {
471 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK);
472 dinfo->ndi_node = node;
473 dinfo->ndi_name = name;
474 dinfo->ndi_device_type = type;
475 dinfo->ndi_compatible = compatible;
476 device_set_ivars(cdev, dinfo);
477 } else
478 free(name, M_OFWPROP);
479
480 return (cdev);
481 }
482
483 static const char *
484 nexus_ofw_get_name(device_t bus, device_t dev)
485 {
486 struct nexus_devinfo *dinfo;
487
488 if ((dinfo = device_get_ivars(dev)) == NULL)
489 return (NULL);
490
491 return (dinfo->ndi_name);
492 }
493
494 static phandle_t
495 nexus_ofw_get_node(device_t bus, device_t dev)
496 {
497 struct nexus_devinfo *dinfo;
498
499 if ((dinfo = device_get_ivars(dev)) == NULL)
500 return (0);
501
502 return (dinfo->ndi_node);
503 }
504
505 static const char *
506 nexus_ofw_get_type(device_t bus, device_t dev)
507 {
508 struct nexus_devinfo *dinfo;
509
510 if ((dinfo = device_get_ivars(dev)) == NULL)
511 return (NULL);
512
513 return (dinfo->ndi_device_type);
514 }
515
516 static const char *
517 nexus_ofw_get_compat(device_t bus, device_t dev)
518 {
519 struct nexus_devinfo *dinfo;
520
521 if ((dinfo = device_get_ivars(dev)) == NULL)
522 return (NULL);
523
524 return (dinfo->ndi_compatible);
525 }
526
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