Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/apb.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/interrupt.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/rman.h> 40 #include <sys/malloc.h> 41 #include <sys/pcpu.h> 42 #include <sys/proc.h> 43 #include <sys/pmc.h> 44 #include <sys/pmckern.h> 45 46 #include <machine/bus.h> 47 #include <machine/intr_machdep.h> 48 49 #include <mips/atheros/apbvar.h> 50 #include <mips/atheros/ar71xxreg.h> 51 #include <mips/atheros/ar71xx_setup.h> 52 53 #define APB_INTR_PMC 5 54 55 #undef APB_DEBUG 56 #ifdef APB_DEBUG 57 #define dprintf printf 58 #else 59 #define dprintf(x, arg...) 60 #endif /* APB_DEBUG */ 61 62 #define DEVTOAPB(dev) ((struct apb_ivar *) device_get_ivars(dev)) 63 64 static int apb_activate_resource(device_t, device_t, int, int, 65 struct resource *); 66 static device_t apb_add_child(device_t, u_int, const char *, int); 67 static struct resource * 68 apb_alloc_resource(device_t, device_t, int, int *, rman_res_t, 69 rman_res_t, rman_res_t, u_int); 70 static int apb_attach(device_t); 71 static int apb_deactivate_resource(device_t, device_t, int, int, 72 struct resource *); 73 static struct resource_list * 74 apb_get_resource_list(device_t, device_t); 75 static void apb_hinted_child(device_t, const char *, int); 76 static int apb_filter(void *); 77 static int apb_probe(device_t); 78 static int apb_release_resource(device_t, device_t, int, int, 79 struct resource *); 80 static int apb_setup_intr(device_t, device_t, struct resource *, int, 81 driver_filter_t *, driver_intr_t *, void *, void **); 82 static int apb_teardown_intr(device_t, device_t, struct resource *, 83 void *); 84 85 static void 86 apb_mask_irq(void *source) 87 { 88 unsigned int irq = (unsigned int)source; 89 uint32_t reg; 90 91 reg = ATH_READ_REG(AR71XX_MISC_INTR_MASK); 92 ATH_WRITE_REG(AR71XX_MISC_INTR_MASK, reg & ~(1 << irq)); 93 94 } 95 96 static void 97 apb_unmask_irq(void *source) 98 { 99 uint32_t reg; 100 unsigned int irq = (unsigned int)source; 101 102 reg = ATH_READ_REG(AR71XX_MISC_INTR_MASK); 103 ATH_WRITE_REG(AR71XX_MISC_INTR_MASK, reg | (1 << irq)); 104 } 105 106 static int 107 apb_probe(device_t dev) 108 { 109 110 return (BUS_PROBE_NOWILDCARD); 111 } 112 113 static int 114 apb_attach(device_t dev) 115 { 116 struct apb_softc *sc = device_get_softc(dev); 117 int rid = 0; 118 119 device_set_desc(dev, "APB Bus bridge"); 120 121 sc->apb_mem_rman.rm_type = RMAN_ARRAY; 122 sc->apb_mem_rman.rm_descr = "APB memory window"; 123 124 if (rman_init(&sc->apb_mem_rman) != 0 || 125 rman_manage_region(&sc->apb_mem_rman, 126 AR71XX_APB_BASE, 127 AR71XX_APB_BASE + AR71XX_APB_SIZE - 1) != 0) 128 panic("apb_attach: failed to set up memory rman"); 129 130 sc->apb_irq_rman.rm_type = RMAN_ARRAY; 131 sc->apb_irq_rman.rm_descr = "APB IRQ"; 132 133 if (rman_init(&sc->apb_irq_rman) != 0 || 134 rman_manage_region(&sc->apb_irq_rman, 135 APB_IRQ_BASE, APB_IRQ_END) != 0) 136 panic("apb_attach: failed to set up IRQ rman"); 137 138 if ((sc->sc_misc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 139 RF_SHAREABLE | RF_ACTIVE)) == NULL) { 140 device_printf(dev, "unable to allocate IRQ resource\n"); 141 return (ENXIO); 142 } 143 144 if ((bus_setup_intr(dev, sc->sc_misc_irq, INTR_TYPE_MISC, 145 apb_filter, NULL, sc, &sc->sc_misc_ih))) { 146 device_printf(dev, 147 "WARNING: unable to register interrupt handler\n"); 148 return (ENXIO); 149 } 150 151 bus_generic_probe(dev); 152 bus_enumerate_hinted_children(dev); 153 bus_generic_attach(dev); 154 155 /* 156 * Unmask performance counter IRQ 157 */ 158 apb_unmask_irq((void*)APB_INTR_PMC); 159 sc->sc_intr_counter[APB_INTR_PMC] = mips_intrcnt_create("apb irq5: pmc"); 160 161 return (0); 162 } 163 164 static struct resource * 165 apb_alloc_resource(device_t bus, device_t child, int type, int *rid, 166 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 167 { 168 struct apb_softc *sc = device_get_softc(bus); 169 struct apb_ivar *ivar = device_get_ivars(child); 170 struct resource *rv; 171 struct resource_list_entry *rle; 172 struct rman *rm; 173 int isdefault, needactivate, passthrough; 174 175 isdefault = (RMAN_IS_DEFAULT_RANGE(start, end)); 176 needactivate = flags & RF_ACTIVE; 177 /* 178 * Pass memory requests to nexus device 179 */ 180 passthrough = (device_get_parent(child) != bus); 181 rle = NULL; 182 183 dprintf("%s: entry (%p, %p, %d, %d, %p, %p, %jd, %d)\n", 184 __func__, bus, child, type, *rid, (void *)(intptr_t)start, 185 (void *)(intptr_t)end, count, flags); 186 187 if (passthrough) 188 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type, 189 rid, start, end, count, flags)); 190 191 /* 192 * If this is an allocation of the "default" range for a given RID, 193 * and we know what the resources for this device are (ie. they aren't 194 * maintained by a child bus), then work out the start/end values. 195 */ 196 197 if (isdefault) { 198 rle = resource_list_find(&ivar->resources, type, *rid); 199 if (rle == NULL) { 200 return (NULL); 201 } 202 203 if (rle->res != NULL) { 204 panic("%s: resource entry is busy", __func__); 205 } 206 start = rle->start; 207 end = rle->end; 208 count = rle->count; 209 210 dprintf("%s: default resource (%p, %p, %ld)\n", 211 __func__, (void *)(intptr_t)start, 212 (void *)(intptr_t)end, count); 213 } 214 215 switch (type) { 216 case SYS_RES_IRQ: 217 rm = &sc->apb_irq_rman; 218 break; 219 case SYS_RES_MEMORY: 220 rm = &sc->apb_mem_rman; 221 break; 222 default: 223 printf("%s: unknown resource type %d\n", __func__, type); 224 return (0); 225 } 226 227 rv = rman_reserve_resource(rm, start, end, count, flags, child); 228 if (rv == NULL) { 229 printf("%s: could not reserve resource\n", __func__); 230 return (0); 231 } 232 233 rman_set_rid(rv, *rid); 234 235 if (needactivate) { 236 if (bus_activate_resource(child, type, *rid, rv)) { 237 printf("%s: could not activate resource\n", __func__); 238 rman_release_resource(rv); 239 return (0); 240 } 241 } 242 243 return (rv); 244 } 245 246 static int 247 apb_activate_resource(device_t bus, device_t child, int type, int rid, 248 struct resource *r) 249 { 250 251 /* XXX: should we mask/unmask IRQ here? */ 252 return (BUS_ACTIVATE_RESOURCE(device_get_parent(bus), child, 253 type, rid, r)); 254 } 255 256 static int 257 apb_deactivate_resource(device_t bus, device_t child, int type, int rid, 258 struct resource *r) 259 { 260 261 /* XXX: should we mask/unmask IRQ here? */ 262 return (BUS_DEACTIVATE_RESOURCE(device_get_parent(bus), child, 263 type, rid, r)); 264 } 265 266 static int 267 apb_release_resource(device_t dev, device_t child, int type, 268 int rid, struct resource *r) 269 { 270 struct resource_list *rl; 271 struct resource_list_entry *rle; 272 273 rl = apb_get_resource_list(dev, child); 274 if (rl == NULL) 275 return (EINVAL); 276 rle = resource_list_find(rl, type, rid); 277 if (rle == NULL) 278 return (EINVAL); 279 rman_release_resource(r); 280 rle->res = NULL; 281 282 return (0); 283 } 284 285 static int 286 apb_setup_intr(device_t bus, device_t child, struct resource *ires, 287 int flags, driver_filter_t *filt, driver_intr_t *handler, 288 void *arg, void **cookiep) 289 { 290 struct apb_softc *sc = device_get_softc(bus); 291 struct intr_event *event; 292 int irq, error; 293 294 irq = rman_get_start(ires); 295 296 if (irq > APB_IRQ_END) 297 panic("%s: bad irq %d", __func__, irq); 298 299 event = sc->sc_eventstab[irq]; 300 if (event == NULL) { 301 error = intr_event_create(&event, (void *)irq, 0, irq, 302 apb_mask_irq, apb_unmask_irq, 303 NULL, NULL, 304 "apb intr%d:", irq); 305 306 if (error == 0) { 307 sc->sc_eventstab[irq] = event; 308 sc->sc_intr_counter[irq] = 309 mips_intrcnt_create(event->ie_name); 310 } 311 else 312 return (error); 313 } 314 315 intr_event_add_handler(event, device_get_nameunit(child), filt, 316 handler, arg, intr_priority(flags), flags, cookiep); 317 mips_intrcnt_setname(sc->sc_intr_counter[irq], event->ie_fullname); 318 319 apb_unmask_irq((void*)irq); 320 321 return (0); 322 } 323 324 static int 325 apb_teardown_intr(device_t dev, device_t child, struct resource *ires, 326 void *cookie) 327 { 328 struct apb_softc *sc = device_get_softc(dev); 329 int irq, result; 330 331 irq = rman_get_start(ires); 332 if (irq > APB_IRQ_END) 333 panic("%s: bad irq %d", __func__, irq); 334 335 if (sc->sc_eventstab[irq] == NULL) 336 panic("Trying to teardown unoccupied IRQ"); 337 338 apb_mask_irq((void*)irq); 339 340 result = intr_event_remove_handler(cookie); 341 if (!result) 342 sc->sc_eventstab[irq] = NULL; 343 344 return (result); 345 } 346 347 static int 348 apb_filter(void *arg) 349 { 350 struct apb_softc *sc = arg; 351 struct intr_event *event; 352 uint32_t reg, irq; 353 struct thread *td; 354 struct trapframe *tf; 355 356 reg = ATH_READ_REG(AR71XX_MISC_INTR_STATUS); 357 for (irq = 0; irq < APB_NIRQS; irq++) { 358 if (reg & (1 << irq)) { 359 switch (ar71xx_soc) { 360 case AR71XX_SOC_AR7240: 361 case AR71XX_SOC_AR7241: 362 case AR71XX_SOC_AR7242: 363 case AR71XX_SOC_AR9330: 364 case AR71XX_SOC_AR9331: 365 case AR71XX_SOC_AR9341: 366 case AR71XX_SOC_AR9342: 367 case AR71XX_SOC_AR9344: 368 case AR71XX_SOC_QCA9533: 369 case AR71XX_SOC_QCA9533_V2: 370 case AR71XX_SOC_QCA9556: 371 case AR71XX_SOC_QCA9558: 372 /* ACK/clear the given interrupt */ 373 ATH_WRITE_REG(AR71XX_MISC_INTR_STATUS, 374 (1 << irq)); 375 break; 376 default: 377 /* fallthrough */ 378 break; 379 } 380 381 event = sc->sc_eventstab[irq]; 382 /* always count interrupts; spurious or otherwise */ 383 mips_intrcnt_inc(sc->sc_intr_counter[irq]); 384 if (!event || CK_SLIST_EMPTY(&event->ie_handlers)) { 385 if (irq == APB_INTR_PMC) { 386 td = PCPU_GET(curthread); 387 tf = td->td_intr_frame; 388 389 if (pmc_intr) 390 (*pmc_intr)(tf); 391 continue; 392 } 393 /* Ignore timer interrupts */ 394 if (irq != 0 && irq != 8 && irq != 9 && irq != 10) 395 printf("Stray APB IRQ %d\n", irq); 396 continue; 397 } 398 399 intr_event_handle(event, PCPU_GET(curthread)->td_intr_frame); 400 } 401 } 402 403 return (FILTER_HANDLED); 404 } 405 406 static void 407 apb_hinted_child(device_t bus, const char *dname, int dunit) 408 { 409 device_t child; 410 long maddr; 411 int msize; 412 int irq; 413 int result; 414 int mem_hints_count; 415 416 child = BUS_ADD_CHILD(bus, 0, dname, dunit); 417 418 /* 419 * Set hard-wired resources for hinted child using 420 * specific RIDs. 421 */ 422 mem_hints_count = 0; 423 if (resource_long_value(dname, dunit, "maddr", &maddr) == 0) 424 mem_hints_count++; 425 if (resource_int_value(dname, dunit, "msize", &msize) == 0) 426 mem_hints_count++; 427 428 /* check if all info for mem resource has been provided */ 429 if ((mem_hints_count > 0) && (mem_hints_count < 2)) { 430 printf("Either maddr or msize hint is missing for %s%d\n", 431 dname, dunit); 432 } else if (mem_hints_count) { 433 result = bus_set_resource(child, SYS_RES_MEMORY, 0, 434 maddr, msize); 435 if (result != 0) 436 device_printf(bus, 437 "warning: bus_set_resource() failed\n"); 438 } 439 440 if (resource_int_value(dname, dunit, "irq", &irq) == 0) { 441 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1); 442 if (result != 0) 443 device_printf(bus, 444 "warning: bus_set_resource() failed\n"); 445 } 446 } 447 448 static device_t 449 apb_add_child(device_t bus, u_int order, const char *name, int unit) 450 { 451 device_t child; 452 struct apb_ivar *ivar; 453 454 ivar = malloc(sizeof(struct apb_ivar), M_DEVBUF, M_WAITOK | M_ZERO); 455 resource_list_init(&ivar->resources); 456 457 child = device_add_child_ordered(bus, order, name, unit); 458 if (child == NULL) { 459 printf("Can't add child %s%d ordered\n", name, unit); 460 return (0); 461 } 462 463 device_set_ivars(child, ivar); 464 465 return (child); 466 } 467 468 /* 469 * Helper routine for bus_generic_rl_get_resource/bus_generic_rl_set_resource 470 * Provides pointer to resource_list for these routines 471 */ 472 static struct resource_list * 473 apb_get_resource_list(device_t dev, device_t child) 474 { 475 struct apb_ivar *ivar; 476 477 ivar = device_get_ivars(child); 478 return (&(ivar->resources)); 479 } 480 481 static int 482 apb_print_all_resources(device_t dev) 483 { 484 struct apb_ivar *ndev = DEVTOAPB(dev); 485 struct resource_list *rl = &ndev->resources; 486 int retval = 0; 487 488 if (STAILQ_FIRST(rl)) 489 retval += printf(" at"); 490 491 retval += resource_list_print_type(rl, "mem", SYS_RES_MEMORY, "%#jx"); 492 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd"); 493 494 return (retval); 495 } 496 497 static int 498 apb_print_child(device_t bus, device_t child) 499 { 500 int retval = 0; 501 502 retval += bus_print_child_header(bus, child); 503 retval += apb_print_all_resources(child); 504 if (device_get_flags(child)) 505 retval += printf(" flags %#x", device_get_flags(child)); 506 retval += printf(" on %s\n", device_get_nameunit(bus)); 507 508 return (retval); 509 } 510 511 static device_method_t apb_methods[] = { 512 DEVMETHOD(bus_activate_resource, apb_activate_resource), 513 DEVMETHOD(bus_add_child, apb_add_child), 514 DEVMETHOD(bus_alloc_resource, apb_alloc_resource), 515 DEVMETHOD(bus_deactivate_resource, apb_deactivate_resource), 516 DEVMETHOD(bus_get_resource_list, apb_get_resource_list), 517 DEVMETHOD(bus_hinted_child, apb_hinted_child), 518 DEVMETHOD(bus_release_resource, apb_release_resource), 519 DEVMETHOD(bus_setup_intr, apb_setup_intr), 520 DEVMETHOD(bus_teardown_intr, apb_teardown_intr), 521 DEVMETHOD(device_attach, apb_attach), 522 DEVMETHOD(device_probe, apb_probe), 523 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), 524 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), 525 DEVMETHOD(bus_print_child, apb_print_child), 526 527 DEVMETHOD_END 528 }; 529 530 static driver_t apb_driver = { 531 "apb", 532 apb_methods, 533 sizeof(struct apb_softc), 534 }; 535 static devclass_t apb_devclass; 536 537 DRIVER_MODULE(apb, nexus, apb_driver, apb_devclass, 0, 0);
Cache object: 2eb9c10d3a6159068a23a2a9cb785f3e
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