Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/nexus.c
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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/10.0/sys/mips/mips/nexus.c 234525 2012-04-21 04:17:30Z adrian $"); 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 order; 241 int result; 242 int irq; 243 int mem_hints_count; 244 245 if ((resource_int_value(dname, dunit, "order", &order)) != 0) 246 order = 1000; 247 child = BUS_ADD_CHILD(bus, order, dname, dunit); 248 if (child == NULL) 249 return; 250 251 /* 252 * Set hard-wired resources for hinted child using 253 * specific RIDs. 254 */ 255 mem_hints_count = 0; 256 if (resource_long_value(dname, dunit, "maddr", &maddr) == 0) 257 mem_hints_count++; 258 if (resource_int_value(dname, dunit, "msize", &msize) == 0) 259 mem_hints_count++; 260 261 /* check if all info for mem resource has been provided */ 262 if ((mem_hints_count > 0) && (mem_hints_count < 2)) { 263 printf("Either maddr or msize hint is missing for %s%d\n", 264 dname, dunit); 265 } 266 else if (mem_hints_count) { 267 dprintf("%s: discovered hinted child %s at maddr %p(%d)\n", 268 __func__, device_get_nameunit(child), 269 (void *)(intptr_t)maddr, msize); 270 271 result = bus_set_resource(child, SYS_RES_MEMORY, 0, maddr, 272 msize); 273 if (result != 0) { 274 device_printf(bus, 275 "warning: bus_set_resource() failed\n"); 276 } 277 } 278 279 if (resource_int_value(dname, dunit, "irq", &irq) == 0) { 280 result = bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1); 281 if (result != 0) 282 device_printf(bus, 283 "warning: bus_set_resource() failed\n"); 284 } 285 } 286 287 static device_t 288 nexus_add_child(device_t bus, u_int order, const char *name, int unit) 289 { 290 device_t child; 291 struct nexus_device *ndev; 292 293 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 294 if (!ndev) 295 return (0); 296 resource_list_init(&ndev->nx_resources); 297 298 child = device_add_child_ordered(bus, order, name, unit); 299 if (child == NULL) { 300 device_printf(bus, "failed to add child: %s%d\n", name, unit); 301 return (0); 302 } 303 304 /* should we free this in nexus_child_detached? */ 305 device_set_ivars(child, ndev); 306 307 return (child); 308 } 309 310 /* 311 * Allocate a resource on behalf of child. NB: child is usually going to be a 312 * child of one of our descendants, not a direct child of nexus0. 313 * (Exceptions include footbridge.) 314 */ 315 static struct resource * 316 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 317 u_long start, u_long end, u_long count, u_int flags) 318 { 319 struct nexus_device *ndev = DEVTONX(child); 320 struct resource *rv; 321 struct resource_list_entry *rle; 322 struct rman *rm; 323 int isdefault, needactivate, passthrough; 324 325 dprintf("%s: entry (%p, %p, %d, %p, %p, %p, %ld, %d)\n", 326 __func__, bus, child, type, rid, (void *)(intptr_t)start, 327 (void *)(intptr_t)end, count, flags); 328 dprintf("%s: requested rid is %d\n", __func__, *rid); 329 330 isdefault = (start == 0UL && end == ~0UL && count == 1); 331 needactivate = flags & RF_ACTIVE; 332 passthrough = (device_get_parent(child) != bus); 333 rle = NULL; 334 335 /* 336 * If this is an allocation of the "default" range for a given RID, 337 * and we know what the resources for this device are (ie. they aren't 338 * maintained by a child bus), then work out the start/end values. 339 */ 340 if (isdefault) { 341 rle = resource_list_find(&ndev->nx_resources, type, *rid); 342 if (rle == NULL) 343 return (NULL); 344 if (rle->res != NULL) { 345 panic("%s: resource entry is busy", __func__); 346 } 347 start = rle->start; 348 end = rle->end; 349 count = rle->count; 350 } 351 352 switch (type) { 353 case SYS_RES_IRQ: 354 rm = &irq_rman; 355 break; 356 case SYS_RES_MEMORY: 357 rm = &mem_rman; 358 break; 359 default: 360 printf("%s: unknown resource type %d\n", __func__, type); 361 return (0); 362 } 363 364 rv = rman_reserve_resource(rm, start, end, count, flags, child); 365 if (rv == 0) { 366 printf("%s: could not reserve resource for %s\n", __func__, 367 device_get_nameunit(child)); 368 return (0); 369 } 370 371 rman_set_rid(rv, *rid); 372 373 if (needactivate) { 374 if (bus_activate_resource(child, type, *rid, rv)) { 375 printf("%s: could not activate resource\n", __func__); 376 rman_release_resource(rv); 377 return (0); 378 } 379 } 380 381 return (rv); 382 } 383 384 static int 385 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 386 struct resource *r) 387 { 388 void *vaddr; 389 vm_paddr_t paddr; 390 vm_size_t psize; 391 392 /* 393 * If this is a memory resource, use pmap_mapdev to map it. 394 */ 395 if (type == SYS_RES_MEMORY) { 396 paddr = rman_get_start(r); 397 psize = rman_get_size(r); 398 vaddr = pmap_mapdev(paddr, psize); 399 400 rman_set_virtual(r, vaddr); 401 rman_set_bustag(r, mips_bus_space_generic); 402 rman_set_bushandle(r, (bus_space_handle_t)(uintptr_t)vaddr); 403 } 404 405 return (rman_activate_resource(r)); 406 } 407 408 static struct resource_list * 409 nexus_get_reslist(device_t dev, device_t child) 410 { 411 struct nexus_device *ndev = DEVTONX(child); 412 413 return (&ndev->nx_resources); 414 } 415 416 static int 417 nexus_set_resource(device_t dev, device_t child, int type, int rid, 418 u_long start, u_long count) 419 { 420 struct nexus_device *ndev = DEVTONX(child); 421 struct resource_list *rl = &ndev->nx_resources; 422 struct resource_list_entry *rle; 423 424 dprintf("%s: entry (%p, %p, %d, %d, %p, %ld)\n", 425 __func__, dev, child, type, rid, (void *)(intptr_t)start, count); 426 427 rle = resource_list_add(rl, type, rid, start, start + count - 1, 428 count); 429 if (rle == NULL) 430 return (ENXIO); 431 432 return (0); 433 } 434 435 static int 436 nexus_get_resource(device_t dev, device_t child, int type, int rid, 437 u_long *startp, u_long *countp) 438 { 439 struct nexus_device *ndev = DEVTONX(child); 440 struct resource_list *rl = &ndev->nx_resources; 441 struct resource_list_entry *rle; 442 443 rle = resource_list_find(rl, type, rid); 444 if (!rle) 445 return(ENOENT); 446 if (startp) 447 *startp = rle->start; 448 if (countp) 449 *countp = rle->count; 450 return (0); 451 } 452 453 static void 454 nexus_delete_resource(device_t dev, device_t child, int type, int rid) 455 { 456 struct nexus_device *ndev = DEVTONX(child); 457 struct resource_list *rl = &ndev->nx_resources; 458 459 dprintf("%s: entry\n", __func__); 460 461 resource_list_delete(rl, type, rid); 462 } 463 464 static int 465 nexus_release_resource(device_t bus, device_t child, int type, int rid, 466 struct resource *r) 467 { 468 dprintf("%s: entry\n", __func__); 469 470 if (rman_get_flags(r) & RF_ACTIVE) { 471 int error = bus_deactivate_resource(child, type, rid, r); 472 if (error) 473 return error; 474 } 475 476 return (rman_release_resource(r)); 477 } 478 479 static int 480 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 481 struct resource *r) 482 { 483 vm_offset_t va; 484 485 if (type == SYS_RES_MEMORY) { 486 va = (vm_offset_t)rman_get_virtual(r); 487 pmap_unmapdev(va, rman_get_size(r)); 488 } 489 490 return (rman_deactivate_resource(r)); 491 } 492 493 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);
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