FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/nexus.c
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
31 /*
32 * This code implements a `root nexus' for MIPS Architecture
33 * machines. The function of the root nexus is to serve as an
34 * attachment point for both processors and buses, and to manage
35 * resources which are common to all of them. In particular,
36 * this code implements the core resource managers for interrupt
37 * requests and memory address space.
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: releng/8.4/sys/mips/mips/nexus.c 223500 2011-06-24 13:41:46Z jhb $");
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/bus.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/module.h>
49 #include <sys/rman.h>
50 #include <sys/interrupt.h>
51
52 #include <vm/vm.h>
53 #include <vm/pmap.h>
54
55 #include <machine/bus.h>
56 #include <machine/intr_machdep.h>
57 #include <machine/pmap.h>
58 #include <machine/resource.h>
59 #include <machine/vmparam.h>
60
61 #undef NEXUS_DEBUG
62 #ifdef NEXUS_DEBUG
63 #define dprintf printf
64 #else
65 #define dprintf(x, arg...)
66 #endif /* NEXUS_DEBUG */
67
68 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
69
70 struct nexus_device {
71 struct resource_list nx_resources;
72 };
73
74 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
75 #define NUM_MIPS_IRQS 6
76
77 static struct rman irq_rman;
78 static struct rman mem_rman;
79
80 static struct resource *
81 nexus_alloc_resource(device_t, device_t, int, int *, u_long,
82 u_long, u_long, u_int);
83 static int nexus_activate_resource(device_t, device_t, int, int,
84 struct resource *);
85 static device_t nexus_add_child(device_t, u_int, const char *, int);
86 static int nexus_attach(device_t);
87 static int nexus_deactivate_resource(device_t, device_t, int, int,
88 struct resource *);
89 static void nexus_delete_resource(device_t, device_t, int, int);
90 static struct resource_list *
91 nexus_get_reslist(device_t, device_t);
92 static int nexus_get_resource(device_t, device_t, int, int, u_long *,
93 u_long *);
94 static void nexus_hinted_child(device_t, const char *, int);
95 static int nexus_print_child(device_t, device_t);
96 static int nexus_print_all_resources(device_t dev);
97 static int nexus_probe(device_t);
98 static int nexus_release_resource(device_t, device_t, int, int,
99 struct resource *);
100 static int nexus_set_resource(device_t, device_t, int, int, u_long,
101 u_long);
102 static int nexus_setup_intr(device_t dev, device_t child,
103 struct resource *res, int flags, driver_filter_t *filt,
104 driver_intr_t *intr, void *arg, void **cookiep);
105 static int nexus_teardown_intr(device_t, device_t, struct resource *,
106 void *);
107
108 static device_method_t nexus_methods[] = {
109 /* Device interface */
110 DEVMETHOD(device_probe, nexus_probe),
111 DEVMETHOD(device_attach, nexus_attach),
112
113 /* Bus interface */
114 DEVMETHOD(bus_add_child, nexus_add_child),
115 DEVMETHOD(bus_activate_resource,nexus_activate_resource),
116 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource),
117 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource),
118 DEVMETHOD(bus_delete_resource, nexus_delete_resource),
119 DEVMETHOD(bus_get_resource, nexus_get_resource),
120 DEVMETHOD(bus_get_resource_list, nexus_get_reslist),
121 DEVMETHOD(bus_hinted_child, nexus_hinted_child),
122 DEVMETHOD(bus_print_child, nexus_print_child),
123 DEVMETHOD(bus_release_resource, nexus_release_resource),
124 DEVMETHOD(bus_set_resource, nexus_set_resource),
125 DEVMETHOD(bus_setup_intr, nexus_setup_intr),
126 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr),
127
128 { 0, 0 }
129 };
130
131 static driver_t nexus_driver = {
132 "nexus",
133 nexus_methods,
134 1 /* no softc */
135 };
136 static devclass_t nexus_devclass;
137
138 static int
139 nexus_probe(device_t dev)
140 {
141
142 device_set_desc(dev, "MIPS32 root nexus");
143
144 irq_rman.rm_start = 0;
145 irq_rman.rm_end = NUM_MIPS_IRQS - 1;
146 irq_rman.rm_type = RMAN_ARRAY;
147 irq_rman.rm_descr = "Hardware IRQs";
148 if (rman_init(&irq_rman) != 0 ||
149 rman_manage_region(&irq_rman, 0, NUM_MIPS_IRQS - 1) != 0) {
150 panic("%s: irq_rman", __func__);
151 }
152
153 mem_rman.rm_start = 0;
154 mem_rman.rm_end = ~0ul;
155 mem_rman.rm_type = RMAN_ARRAY;
156 mem_rman.rm_descr = "Memory addresses";
157 if (rman_init(&mem_rman) != 0 ||
158 rman_manage_region(&mem_rman, 0, ~0) != 0) {
159 panic("%s: mem_rman", __func__);
160 }
161
162 return (0);
163 }
164
165 static int
166 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
167 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
168 {
169 register_t s;
170 int irq;
171
172 s = intr_disable();
173 irq = rman_get_start(res);
174 if (irq >= NUM_MIPS_IRQS) {
175 intr_restore(s);
176 return (0);
177 }
178
179 cpu_establish_hardintr(device_get_nameunit(child), filt, intr, arg,
180 irq, flags, cookiep);
181 intr_restore(s);
182 return (0);
183 }
184
185 static int
186 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
187 {
188
189 printf("Unimplemented %s at %s:%d\n", __func__, __FILE__, __LINE__);
190 return (0);
191 }
192
193 static int
194 nexus_attach(device_t dev)
195 {
196
197 bus_generic_probe(dev);
198 bus_enumerate_hinted_children(dev);
199 bus_generic_attach(dev);
200
201 return (0);
202 }
203
204 static int
205 nexus_print_child(device_t bus, device_t child)
206 {
207 int retval = 0;
208
209 retval += bus_print_child_header(bus, child);
210 retval += nexus_print_all_resources(child);
211 if (device_get_flags(child))
212 retval += printf(" flags %#x", device_get_flags(child));
213 retval += printf(" on %s\n", device_get_nameunit(bus));
214
215 return (retval);
216 }
217
218 static int
219 nexus_print_all_resources(device_t dev)
220 {
221 struct nexus_device *ndev = DEVTONX(dev);
222 struct resource_list *rl = &ndev->nx_resources;
223 int retval = 0;
224
225 if (STAILQ_FIRST(rl))
226 retval += printf(" at");
227
228 retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#lx");
229 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
230
231 return (retval);
232 }
233
234 static void
235 nexus_hinted_child(device_t bus, const char *dname, int dunit)
236 {
237 device_t child;
238 long maddr;
239 int msize;
240 int result;
241 int irq;
242 int mem_hints_count;
243
244 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
245 if (child == NULL)
246 return;
247
248 /*
249 * Set hard-wired resources for hinted child using
250 * specific RIDs.
251 */
252 mem_hints_count = 0;
253 if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
254 mem_hints_count++;
255 if (resource_int_value(dname, dunit, "msize", &msize) == 0)
256 mem_hints_count++;
257
258 /* check if all info for mem resource has been provided */
259 if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
260 printf("Either maddr or msize hint is missing for %s%d\n",
261 dname, dunit);
262 }
263 else if (mem_hints_count) {
264 dprintf("%s: discovered hinted child %s at maddr %p(%d)\n",
265 __func__, device_get_nameunit(child),
266 (void *)(intptr_t)maddr, msize);
267
268 result = bus_set_resource(child, SYS_RES_MEMORY, 0, maddr,
269 msize);
270 if (result != 0) {
271 device_printf(bus,
272 "warning: bus_set_resource() failed\n");
273 }
274 }
275
276 if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
277 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
278 if (result != 0)
279 device_printf(bus,
280 "warning: bus_set_resource() failed\n");
281 }
282 }
283
284 static device_t
285 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
286 {
287 device_t child;
288 struct nexus_device *ndev;
289
290 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
291 if (!ndev)
292 return (0);
293 resource_list_init(&ndev->nx_resources);
294
295 child = device_add_child_ordered(bus, order, name, unit);
296 if (child == NULL) {
297 device_printf(bus, "failed to add child: %s%d\n", name, unit);
298 return (0);
299 }
300
301 /* should we free this in nexus_child_detached? */
302 device_set_ivars(child, ndev);
303
304 return (child);
305 }
306
307 /*
308 * Allocate a resource on behalf of child. NB: child is usually going to be a
309 * child of one of our descendants, not a direct child of nexus0.
310 * (Exceptions include footbridge.)
311 */
312 static struct resource *
313 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
314 u_long start, u_long end, u_long count, u_int flags)
315 {
316 struct nexus_device *ndev = DEVTONX(child);
317 struct resource *rv;
318 struct resource_list_entry *rle;
319 struct rman *rm;
320 int isdefault, needactivate, passthrough;
321
322 dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %ld, %d)\n",
323 __func__, bus, child, type, rid, (void *)(intptr_t)start,
324 (void *)(intptr_t)end, count, flags);
325 dprintf("%s: requested rid is %d\n", __func__, *rid);
326
327 isdefault = (start == 0UL && end == ~0UL && count == 1);
328 needactivate = flags & RF_ACTIVE;
329 passthrough = (device_get_parent(child) != bus);
330 rle = NULL;
331
332 /*
333 * If this is an allocation of the "default" range for a given RID,
334 * and we know what the resources for this device are (ie. they aren't
335 * maintained by a child bus), then work out the start/end values.
336 */
337 if (isdefault) {
338 rle = resource_list_find(&ndev->nx_resources, type, *rid);
339 if (rle == NULL)
340 return (NULL);
341 if (rle->res != NULL) {
342 panic("%s: resource entry is busy", __func__);
343 }
344 start = rle->start;
345 end = rle->end;
346 count = rle->count;
347 }
348
349 switch (type) {
350 case SYS_RES_IRQ:
351 rm = &irq_rman;
352 break;
353 case SYS_RES_MEMORY:
354 rm = &mem_rman;
355 break;
356 default:
357 printf("%s: unknown resource type %d\n", __func__, type);
358 return (0);
359 }
360
361 rv = rman_reserve_resource(rm, start, end, count, flags, child);
362 if (rv == 0) {
363 printf("%s: could not reserve resource for %s\n", __func__,
364 device_get_nameunit(child));
365 return (0);
366 }
367
368 rman_set_rid(rv, *rid);
369
370 if (needactivate) {
371 if (bus_activate_resource(child, type, *rid, rv)) {
372 printf("%s: could not activate resource\n", __func__);
373 rman_release_resource(rv);
374 return (0);
375 }
376 }
377
378 return (rv);
379 }
380
381 static int
382 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
383 struct resource *r)
384 {
385 void *vaddr;
386 u_int32_t paddr, psize;
387
388 /*
389 * If this is a memory resource, track the direct mapping
390 * in the uncached MIPS KSEG1 segment.
391 */
392 if (type == SYS_RES_MEMORY) {
393 paddr = rman_get_start(r);
394 psize = rman_get_size(r);
395 vaddr = pmap_mapdev(paddr, psize);
396
397 rman_set_virtual(r, vaddr);
398 rman_set_bustag(r, mips_bus_space_generic);
399 rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr);
400 }
401
402 return (rman_activate_resource(r));
403 }
404
405 static struct resource_list *
406 nexus_get_reslist(device_t dev, device_t child)
407 {
408 struct nexus_device *ndev = DEVTONX(child);
409
410 return (&ndev->nx_resources);
411 }
412
413 static int
414 nexus_set_resource(device_t dev, device_t child, int type, int rid,
415 u_long start, u_long count)
416 {
417 struct nexus_device *ndev = DEVTONX(child);
418 struct resource_list *rl = &ndev->nx_resources;
419 struct resource_list_entry *rle;
420
421 dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n",
422 __func__, dev, child, type, rid, (void *)(intptr_t)start, count);
423
424 rle = resource_list_add(rl, type, rid, start, start + count - 1,
425 count);
426 if (rle == NULL)
427 return (ENXIO);
428
429 return (0);
430 }
431
432 static int
433 nexus_get_resource(device_t dev, device_t child, int type, int rid,
434 u_long *startp, u_long *countp)
435 {
436 struct nexus_device *ndev = DEVTONX(child);
437 struct resource_list *rl = &ndev->nx_resources;
438 struct resource_list_entry *rle;
439
440 rle = resource_list_find(rl, type, rid);
441 if (!rle)
442 return(ENOENT);
443 if (startp)
444 *startp = rle->start;
445 if (countp)
446 *countp = rle->count;
447 return (0);
448 }
449
450 static void
451 nexus_delete_resource(device_t dev, device_t child, int type, int rid)
452 {
453 struct nexus_device *ndev = DEVTONX(child);
454 struct resource_list *rl = &ndev->nx_resources;
455
456 dprintf("%s: entry\n", __func__);
457
458 resource_list_delete(rl, type, rid);
459 }
460
461 static int
462 nexus_release_resource(device_t bus, device_t child, int type, int rid,
463 struct resource *r)
464 {
465 dprintf("%s: entry\n", __func__);
466
467 if (rman_get_flags(r) & RF_ACTIVE) {
468 int error = bus_deactivate_resource(child, type, rid, r);
469 if (error)
470 return error;
471 }
472
473 return (rman_release_resource(r));
474 }
475
476 static int
477 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
478 struct resource *r)
479 {
480 vm_offset_t va;
481
482 if (type == SYS_RES_MEMORY) {
483 va = (vm_offset_t)rman_get_virtual(r);
484 pmap_unmapdev(va, rman_get_size(r));
485 }
486
487 return (rman_deactivate_resource(r));
488 }
489
490 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
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