FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/apb.c
1 /*-
2 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/8.4/sys/mips/atheros/apb.c 230714 2012-01-29 01:22:48Z marius $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/interrupt.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/rman.h>
38 #include <sys/malloc.h>
39
40 #include <machine/bus.h>
41 #include <machine/intr_machdep.h>
42
43 #include <mips/atheros/apbvar.h>
44 #include <mips/atheros/ar71xxreg.h>
45
46 #undef APB_DEBUG
47 #ifdef APB_DEBUG
48 #define dprintf printf
49 #else
50 #define dprintf(x, arg...)
51 #endif /* APB_DEBUG */
52
53 static int apb_activate_resource(device_t, device_t, int, int,
54 struct resource *);
55 static device_t apb_add_child(device_t, u_int, const char *, int);
56 static struct resource *
57 apb_alloc_resource(device_t, device_t, int, int *, u_long,
58 u_long, u_long, u_int);
59 static int apb_attach(device_t);
60 static int apb_deactivate_resource(device_t, device_t, int, int,
61 struct resource *);
62 static struct resource_list *
63 apb_get_resource_list(device_t, device_t);
64 static void apb_hinted_child(device_t, const char *, int);
65 static int apb_intr(void *);
66 static int apb_probe(device_t);
67 static int apb_release_resource(device_t, device_t, int, int,
68 struct resource *);
69 static int apb_setup_intr(device_t, device_t, struct resource *, int,
70 driver_filter_t *, driver_intr_t *, void *, void **);
71 static int apb_teardown_intr(device_t, device_t, struct resource *,
72 void *);
73
74 static void
75 apb_mask_irq(void *source)
76 {
77 unsigned int irq = (unsigned int)source;
78 uint32_t reg;
79
80 reg = ATH_READ_REG(AR71XX_MISC_INTR_MASK);
81 ATH_WRITE_REG(AR71XX_MISC_INTR_MASK, reg & ~(1 << irq));
82
83 }
84
85 static void
86 apb_unmask_irq(void *source)
87 {
88 uint32_t reg;
89 unsigned int irq = (unsigned int)source;
90
91 reg = ATH_READ_REG(AR71XX_MISC_INTR_MASK);
92 ATH_WRITE_REG(AR71XX_MISC_INTR_MASK, reg | (1 << irq));
93 }
94
95 static int
96 apb_probe(device_t dev)
97 {
98
99 return (0);
100 }
101
102 static int
103 apb_attach(device_t dev)
104 {
105 struct apb_softc *sc = device_get_softc(dev);
106 int rid = 0;
107
108 device_set_desc(dev, "APB Bus bridge");
109
110 sc->apb_mem_rman.rm_type = RMAN_ARRAY;
111 sc->apb_mem_rman.rm_descr = "APB memory window";
112
113 if (rman_init(&sc->apb_mem_rman) != 0 ||
114 rman_manage_region(&sc->apb_mem_rman,
115 AR71XX_APB_BASE,
116 AR71XX_APB_BASE + AR71XX_APB_SIZE - 1) != 0)
117 panic("apb_attach: failed to set up memory rman");
118
119 sc->apb_irq_rman.rm_type = RMAN_ARRAY;
120 sc->apb_irq_rman.rm_descr = "APB IRQ";
121
122 if (rman_init(&sc->apb_irq_rman) != 0 ||
123 rman_manage_region(&sc->apb_irq_rman,
124 APB_IRQ_BASE, APB_IRQ_END) != 0)
125 panic("apb_attach: failed to set up IRQ rman");
126
127 if ((sc->sc_misc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
128 RF_SHAREABLE | RF_ACTIVE)) == NULL) {
129 device_printf(dev, "unable to allocate IRQ resource\n");
130 return (ENXIO);
131 }
132
133 if ((bus_setup_intr(dev, sc->sc_misc_irq, INTR_TYPE_MISC,
134 apb_intr, NULL, sc, &sc->sc_misc_ih))) {
135 device_printf(dev,
136 "WARNING: unable to register interrupt handler\n");
137 return (ENXIO);
138 }
139
140 bus_generic_probe(dev);
141 bus_enumerate_hinted_children(dev);
142 bus_generic_attach(dev);
143
144 return (0);
145 }
146
147 static struct resource *
148 apb_alloc_resource(device_t bus, device_t child, int type, int *rid,
149 u_long start, u_long end, u_long count, u_int flags)
150 {
151 struct apb_softc *sc = device_get_softc(bus);
152 struct apb_ivar *ivar = device_get_ivars(child);
153 struct resource *rv;
154 struct resource_list_entry *rle;
155 struct rman *rm;
156 int isdefault, needactivate, passthrough;
157
158 isdefault = (start == 0UL && end == ~0UL);
159 needactivate = flags & RF_ACTIVE;
160 /*
161 * Pass memory requests to nexus device
162 */
163 passthrough = (device_get_parent(child) != bus);
164 rle = NULL;
165
166 dprintf("%s: entry (%p, %p, %d, %d, %p, %p, %ld, %d)\n",
167 __func__, bus, child, type, *rid, (void *)(intptr_t)start,
168 (void *)(intptr_t)end, count, flags);
169
170 if (passthrough)
171 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type,
172 rid, start, end, count, flags));
173
174 /*
175 * If this is an allocation of the "default" range for a given RID,
176 * and we know what the resources for this device are (ie. they aren't
177 * maintained by a child bus), then work out the start/end values.
178 */
179
180 if (isdefault) {
181 rle = resource_list_find(&ivar->resources, type, *rid);
182 if (rle == NULL) {
183 return (NULL);
184 }
185
186 if (rle->res != NULL) {
187 panic("%s: resource entry is busy", __func__);
188 }
189 start = rle->start;
190 end = rle->end;
191 count = rle->count;
192
193 dprintf("%s: default resource (%p, %p, %ld)\n",
194 __func__, (void *)(intptr_t)start,
195 (void *)(intptr_t)end, count);
196 }
197
198 switch (type) {
199 case SYS_RES_IRQ:
200 rm = &sc->apb_irq_rman;
201 break;
202 case SYS_RES_MEMORY:
203 rm = &sc->apb_mem_rman;
204 break;
205 default:
206 printf("%s: unknown resource type %d\n", __func__, type);
207 return (0);
208 }
209
210 rv = rman_reserve_resource(rm, start, end, count, flags, child);
211 if (rv == 0) {
212 printf("%s: could not reserve resource\n", __func__);
213 return (0);
214 }
215
216 rman_set_rid(rv, *rid);
217
218 if (needactivate) {
219 if (bus_activate_resource(child, type, *rid, rv)) {
220 printf("%s: could not activate resource\n", __func__);
221 rman_release_resource(rv);
222 return (0);
223 }
224 }
225
226 return (rv);
227 }
228
229 static int
230 apb_activate_resource(device_t bus, device_t child, int type, int rid,
231 struct resource *r)
232 {
233
234 /* XXX: should we mask/unmask IRQ here? */
235 return (BUS_ACTIVATE_RESOURCE(device_get_parent(bus), child,
236 type, rid, r));
237 }
238
239 static int
240 apb_deactivate_resource(device_t bus, device_t child, int type, int rid,
241 struct resource *r)
242 {
243
244 /* XXX: should we mask/unmask IRQ here? */
245 return (BUS_DEACTIVATE_RESOURCE(device_get_parent(bus), child,
246 type, rid, r));
247 }
248
249 static int
250 apb_release_resource(device_t dev, device_t child, int type,
251 int rid, struct resource *r)
252 {
253 struct resource_list *rl;
254 struct resource_list_entry *rle;
255
256 rl = apb_get_resource_list(dev, child);
257 if (rl == NULL)
258 return (EINVAL);
259 rle = resource_list_find(rl, type, rid);
260 if (rle == NULL)
261 return (EINVAL);
262 rman_release_resource(r);
263 rle->res = NULL;
264
265 return (0);
266 }
267
268 static int
269 apb_setup_intr(device_t bus, device_t child, struct resource *ires,
270 int flags, driver_filter_t *filt, driver_intr_t *handler,
271 void *arg, void **cookiep)
272 {
273 struct apb_softc *sc = device_get_softc(bus);
274 struct intr_event *event;
275 int irq, error;
276
277 irq = rman_get_start(ires);
278
279 if (irq > APB_IRQ_END)
280 panic("%s: bad irq %d", __func__, irq);
281
282 event = sc->sc_eventstab[irq];
283 if (event == NULL) {
284 error = intr_event_create(&event, (void *)irq, 0, irq,
285 apb_mask_irq, apb_unmask_irq,
286 NULL, NULL,
287 "apb intr%d:", irq);
288
289 if (error == 0) {
290 sc->sc_eventstab[irq] = event;
291 sc->sc_intr_counter[irq] =
292 mips_intrcnt_create(event->ie_name);
293 }
294 else
295 return (error);
296 }
297
298 intr_event_add_handler(event, device_get_nameunit(child), filt,
299 handler, arg, intr_priority(flags), flags, cookiep);
300 mips_intrcnt_setname(sc->sc_intr_counter[irq], event->ie_fullname);
301
302 apb_unmask_irq((void*)irq);
303
304 return (0);
305 }
306
307 static int
308 apb_teardown_intr(device_t dev, device_t child, struct resource *ires,
309 void *cookie)
310 {
311 struct apb_softc *sc = device_get_softc(dev);
312 int irq, result;
313
314 irq = rman_get_start(ires);
315 if (irq > APB_IRQ_END)
316 panic("%s: bad irq %d", __func__, irq);
317
318 if (sc->sc_eventstab[irq] == NULL)
319 panic("Trying to teardown unoccupied IRQ");
320
321 apb_mask_irq((void*)irq);
322
323 result = intr_event_remove_handler(cookie);
324 if (!result)
325 sc->sc_eventstab[irq] = NULL;
326
327 return (result);
328 }
329
330 static int
331 apb_intr(void *arg)
332 {
333 struct apb_softc *sc = arg;
334 struct intr_event *event;
335 uint32_t reg, irq;
336
337 reg = ATH_READ_REG(AR71XX_MISC_INTR_STATUS);
338 for (irq = 0; irq < APB_NIRQS; irq++) {
339 if (reg & (1 << irq)) {
340 event = sc->sc_eventstab[irq];
341 if (!event || TAILQ_EMPTY(&event->ie_handlers)) {
342 /* Ignore timer interrupts */
343 if (irq != 0)
344 printf("Stray APB IRQ %d\n", irq);
345 continue;
346 }
347
348 /* TODO: frame instead of NULL? */
349 intr_event_handle(event, NULL);
350 mips_intrcnt_inc(sc->sc_intr_counter[irq]);
351 }
352 }
353
354 return (FILTER_HANDLED);
355 }
356
357 static void
358 apb_hinted_child(device_t bus, const char *dname, int dunit)
359 {
360 device_t child;
361 long maddr;
362 int msize;
363 int irq;
364 int result;
365 int mem_hints_count;
366
367 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
368
369 /*
370 * Set hard-wired resources for hinted child using
371 * specific RIDs.
372 */
373 mem_hints_count = 0;
374 if (resource_long_value(dname, dunit, "maddr", &maddr) == 0)
375 mem_hints_count++;
376 if (resource_int_value(dname, dunit, "msize", &msize) == 0)
377 mem_hints_count++;
378
379 /* check if all info for mem resource has been provided */
380 if ((mem_hints_count > 0) && (mem_hints_count < 2)) {
381 printf("Either maddr or msize hint is missing for %s%d\n",
382 dname, dunit);
383 } else if (mem_hints_count) {
384 result = bus_set_resource(child, SYS_RES_MEMORY, 0,
385 maddr, msize);
386 if (result != 0)
387 device_printf(bus,
388 "warning: bus_set_resource() failed\n");
389 }
390
391 if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
392 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1);
393 if (result != 0)
394 device_printf(bus,
395 "warning: bus_set_resource() failed\n");
396 }
397 }
398
399 static device_t
400 apb_add_child(device_t bus, u_int order, const char *name, int unit)
401 {
402 device_t child;
403 struct apb_ivar *ivar;
404
405 ivar = malloc(sizeof(struct apb_ivar), M_DEVBUF, M_WAITOK | M_ZERO);
406 if (ivar == NULL) {
407 printf("Failed to allocate ivar\n");
408 return (0);
409 }
410 resource_list_init(&ivar->resources);
411
412 child = device_add_child_ordered(bus, order, name, unit);
413 if (child == NULL) {
414 printf("Can't add child %s%d ordered\n", name, unit);
415 return (0);
416 }
417
418 device_set_ivars(child, ivar);
419
420 return (child);
421 }
422
423 /*
424 * Helper routine for bus_generic_rl_get_resource/bus_generic_rl_set_resource
425 * Provides pointer to resource_list for these routines
426 */
427 static struct resource_list *
428 apb_get_resource_list(device_t dev, device_t child)
429 {
430 struct apb_ivar *ivar;
431
432 ivar = device_get_ivars(child);
433 return (&(ivar->resources));
434 }
435
436 static device_method_t apb_methods[] = {
437 DEVMETHOD(bus_activate_resource, apb_activate_resource),
438 DEVMETHOD(bus_add_child, apb_add_child),
439 DEVMETHOD(bus_alloc_resource, apb_alloc_resource),
440 DEVMETHOD(bus_deactivate_resource, apb_deactivate_resource),
441 DEVMETHOD(bus_get_resource_list, apb_get_resource_list),
442 DEVMETHOD(bus_hinted_child, apb_hinted_child),
443 DEVMETHOD(bus_release_resource, apb_release_resource),
444 DEVMETHOD(bus_setup_intr, apb_setup_intr),
445 DEVMETHOD(bus_teardown_intr, apb_teardown_intr),
446 DEVMETHOD(device_attach, apb_attach),
447 DEVMETHOD(device_probe, apb_probe),
448 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
449 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
450
451 DEVMETHOD_END
452 };
453
454 static driver_t apb_driver = {
455 "apb",
456 apb_methods,
457 sizeof(struct apb_softc),
458 };
459 static devclass_t apb_devclass;
460
461 DRIVER_MODULE(apb, nexus, apb_driver, apb_devclass, 0, 0);
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