Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/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 * $FreeBSD$ 30 */ 31 32 /* 33 * This code implements a `root nexus' for Intel Architecture 34 * machines. The function of the root nexus is to serve as an 35 * attachment point for both processors and buses, and to manage 36 * resources which are common to all of them. In particular, 37 * this code implements the core resource managers for interrupt 38 * requests, DMA requests (which rightfully should be a part of the 39 * ISA code but it's easier to do it here for now), I/O port addresses, 40 * and I/O memory address space. 41 */ 42 43 #include "mca.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bus.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/module.h> 51 #include <machine/bus.h> 52 #include <sys/rman.h> 53 54 #include <machine/vmparam.h> 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 #include <machine/pmap.h> 58 59 #include <machine/resource.h> 60 #ifdef APIC_IO 61 #include <machine/smp.h> 62 #include <machine/mpapic.h> 63 #endif 64 65 #ifdef PC98 66 #include <pc98/pc98/pc98.h> 67 #else 68 #include <i386/isa/isa.h> 69 #endif 70 #include <i386/isa/intr_machdep.h> 71 72 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 73 struct nexus_device { 74 struct resource_list nx_resources; 75 }; 76 77 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 78 79 static struct rman irq_rman, drq_rman, port_rman, mem_rman; 80 81 static int nexus_probe(device_t); 82 static int nexus_attach(device_t); 83 static int nexus_print_all_resources(device_t dev); 84 static int nexus_print_child(device_t, device_t); 85 static device_t nexus_add_child(device_t bus, int order, const char *name, 86 int unit); 87 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 88 u_long, u_long, u_long, u_int); 89 static int nexus_activate_resource(device_t, device_t, int, int, 90 struct resource *); 91 static int nexus_deactivate_resource(device_t, device_t, int, int, 92 struct resource *); 93 static int nexus_release_resource(device_t, device_t, int, int, 94 struct resource *); 95 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags, 96 void (*)(void *), void *, void **); 97 static int nexus_teardown_intr(device_t, device_t, struct resource *, 98 void *); 99 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long); 100 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *); 101 static void nexus_delete_resource(device_t, device_t, int, int); 102 103 static device_method_t nexus_methods[] = { 104 /* Device interface */ 105 DEVMETHOD(device_probe, nexus_probe), 106 DEVMETHOD(device_attach, nexus_attach), 107 DEVMETHOD(device_detach, bus_generic_detach), 108 DEVMETHOD(device_shutdown, bus_generic_shutdown), 109 DEVMETHOD(device_suspend, bus_generic_suspend), 110 DEVMETHOD(device_resume, bus_generic_resume), 111 112 /* Bus interface */ 113 DEVMETHOD(bus_print_child, nexus_print_child), 114 DEVMETHOD(bus_add_child, nexus_add_child), 115 DEVMETHOD(bus_read_ivar, bus_generic_read_ivar), 116 DEVMETHOD(bus_write_ivar, bus_generic_write_ivar), 117 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 118 DEVMETHOD(bus_release_resource, nexus_release_resource), 119 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 120 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 121 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 122 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 123 DEVMETHOD(bus_set_resource, nexus_set_resource), 124 DEVMETHOD(bus_get_resource, nexus_get_resource), 125 DEVMETHOD(bus_delete_resource, nexus_delete_resource), 126 127 { 0, 0 } 128 }; 129 130 static driver_t nexus_driver = { 131 "nexus", 132 nexus_methods, 133 1, /* no softc */ 134 }; 135 static devclass_t nexus_devclass; 136 137 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 138 139 static int 140 nexus_probe(device_t dev) 141 { 142 143 device_quiet(dev); /* suppress attach message for neatness */ 144 145 /* 146 * IRQ's are on the mainboard on old systems, but on the ISA part 147 * of PCI->ISA bridges. There would be multiple sets of IRQs on 148 * multi-ISA-bus systems. PCI interrupts are routed to the ISA 149 * component, so in a way, PCI can be a partial child of an ISA bus(!). 150 * APIC interrupts are global though. 151 * In the non-APIC case, disallow the use of IRQ 2. 152 */ 153 irq_rman.rm_start = 0; 154 irq_rman.rm_type = RMAN_ARRAY; 155 irq_rman.rm_descr = "Interrupt request lines"; 156 #ifdef APIC_IO 157 irq_rman.rm_end = APIC_INTMAPSIZE - 1; 158 if (rman_init(&irq_rman) 159 || rman_manage_region(&irq_rman, 160 irq_rman.rm_start, irq_rman.rm_end)) 161 panic("nexus_probe irq_rman"); 162 #else 163 irq_rman.rm_end = 15; 164 #ifdef PC98 165 if (rman_init(&irq_rman) 166 || rman_manage_region(&irq_rman, 167 irq_rman.rm_start, irq_rman.rm_end)) 168 panic("nexus_probe irq_rman"); 169 #else 170 if (rman_init(&irq_rman) 171 || rman_manage_region(&irq_rman, irq_rman.rm_start, 1) 172 || rman_manage_region(&irq_rman, 3, irq_rman.rm_end)) 173 panic("nexus_probe irq_rman"); 174 #endif /* PC98 */ 175 #endif 176 177 /* 178 * ISA DMA on PCI systems is implemented in the ISA part of each 179 * PCI->ISA bridge and the channels can be duplicated if there are 180 * multiple bridges. (eg: laptops with docking stations) 181 */ 182 drq_rman.rm_start = 0; 183 #ifdef PC98 184 drq_rman.rm_end = 3; 185 #else 186 drq_rman.rm_end = 7; 187 #endif 188 drq_rman.rm_type = RMAN_ARRAY; 189 drq_rman.rm_descr = "DMA request lines"; 190 /* XXX drq 0 not available on some machines */ 191 if (rman_init(&drq_rman) 192 || rman_manage_region(&drq_rman, 193 drq_rman.rm_start, drq_rman.rm_end)) 194 panic("nexus_probe drq_rman"); 195 196 /* 197 * However, IO ports and Memory truely are global at this level, 198 * as are APIC interrupts (however many IO APICS there turn out 199 * to be on large systems..) 200 */ 201 port_rman.rm_start = 0; 202 port_rman.rm_end = 0xffff; 203 port_rman.rm_type = RMAN_ARRAY; 204 port_rman.rm_descr = "I/O ports"; 205 if (rman_init(&port_rman) 206 || rman_manage_region(&port_rman, 0, 0xffff)) 207 panic("nexus_probe port_rman"); 208 209 mem_rman.rm_start = 0; 210 mem_rman.rm_end = ~0u; 211 mem_rman.rm_type = RMAN_ARRAY; 212 mem_rman.rm_descr = "I/O memory addresses"; 213 if (rman_init(&mem_rman) 214 || rman_manage_region(&mem_rman, 0, ~0)) 215 panic("nexus_probe mem_rman"); 216 217 return bus_generic_probe(dev); 218 } 219 220 static int 221 nexus_attach(device_t dev) 222 { 223 device_t child; 224 225 /* 226 * First, deal with the children we know about already 227 */ 228 bus_generic_attach(dev); 229 /* 230 * And if we didn't see EISA or ISA on a pci bridge, create some 231 * connection points now so they show up "on motherboard". 232 */ 233 if (!devclass_get_device(devclass_find("eisa"), 0)) { 234 child = BUS_ADD_CHILD(dev, 0, "eisa", 0); 235 if (child == NULL) 236 panic("nexus_attach eisa"); 237 device_probe_and_attach(child); 238 } 239 #if NMCA > 0 240 if (!devclass_get_device(devclass_find("mca"), 0)) { 241 child = BUS_ADD_CHILD(dev, 0, "mca", 0); 242 if (child == NULL) 243 panic("nexus_probe mca"); 244 device_probe_and_attach(child); 245 } 246 #endif 247 if (!devclass_get_device(devclass_find("isa"), 0)) { 248 child = BUS_ADD_CHILD(dev, 0, "isa", 0); 249 if (child == NULL) 250 panic("nexus_attach isa"); 251 device_probe_and_attach(child); 252 } 253 254 return 0; 255 } 256 257 static int 258 nexus_print_all_resources(device_t dev) 259 { 260 struct nexus_device *ndev = DEVTONX(dev); 261 struct resource_list *rl = &ndev->nx_resources; 262 int retval = 0; 263 264 if (SLIST_FIRST(rl)) 265 retval += printf(" at"); 266 267 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx"); 268 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx"); 269 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld"); 270 271 return retval; 272 } 273 274 static int 275 nexus_print_child(device_t bus, device_t child) 276 { 277 int retval = 0; 278 279 retval += bus_print_child_header(bus, child); 280 retval += nexus_print_all_resources(child); 281 retval += printf(" on motherboard\n"); 282 283 return (retval); 284 } 285 286 static device_t 287 nexus_add_child(device_t bus, int order, const char *name, int unit) 288 { 289 device_t child; 290 struct nexus_device *ndev; 291 292 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 293 if (!ndev) 294 return(0); 295 resource_list_init(&ndev->nx_resources); 296 297 child = device_add_child_ordered(bus, order, name, unit); 298 299 /* should we free this in nexus_child_detached? */ 300 device_set_ivars(child, ndev); 301 302 return(child); 303 } 304 305 /* 306 * Allocate a resource on behalf of child. NB: child is usually going to be a 307 * child of one of our descendants, not a direct child of nexus0. 308 * (Exceptions include npx.) 309 */ 310 static struct resource * 311 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 312 u_long start, u_long end, u_long count, u_int flags) 313 { 314 struct nexus_device *ndev = DEVTONX(child); 315 struct resource *rv; 316 struct resource_list_entry *rle; 317 struct rman *rm; 318 int needactivate = flags & RF_ACTIVE; 319 320 /* 321 * If this is an allocation of the "default" range for a given RID, and 322 * we know what the resources for this device are (ie. they aren't maintained 323 * by a child bus), then work out the start/end values. 324 */ 325 if ((start == 0UL) && (end == ~0UL) && (count == 1)) { 326 if (ndev == NULL) 327 return(NULL); 328 rle = resource_list_find(&ndev->nx_resources, type, *rid); 329 if (rle == NULL) 330 return(NULL); 331 start = rle->start; 332 end = rle->end; 333 count = rle->count; 334 } 335 336 flags &= ~RF_ACTIVE; 337 338 switch (type) { 339 case SYS_RES_IRQ: 340 rm = &irq_rman; 341 break; 342 343 case SYS_RES_DRQ: 344 rm = &drq_rman; 345 break; 346 347 case SYS_RES_IOPORT: 348 rm = &port_rman; 349 break; 350 351 case SYS_RES_MEMORY: 352 rm = &mem_rman; 353 break; 354 355 default: 356 return 0; 357 } 358 359 rv = rman_reserve_resource(rm, start, end, count, flags, child); 360 if (rv == 0) 361 return 0; 362 363 if (type == SYS_RES_MEMORY) { 364 rman_set_bustag(rv, I386_BUS_SPACE_MEM); 365 } else if (type == SYS_RES_IOPORT) { 366 rman_set_bustag(rv, I386_BUS_SPACE_IO); 367 #ifndef PC98 368 rman_set_bushandle(rv, rv->r_start); 369 #endif 370 } 371 372 #ifdef PC98 373 if ((type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) && 374 i386_bus_space_handle_alloc(rv->r_bustag, rv->r_start, count, 375 &rv->r_bushandle) != 0) { 376 rman_release_resource(rv); 377 return 0; 378 } 379 #endif 380 381 if (needactivate) { 382 if (bus_activate_resource(child, type, *rid, rv)) { 383 #ifdef PC98 384 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 385 i386_bus_space_handle_free(rv->r_bustag, 386 rv->r_bushandle, rv->r_bushandle->bsh_sz); 387 } 388 #endif 389 rman_release_resource(rv); 390 return 0; 391 } 392 } 393 394 return rv; 395 } 396 397 static int 398 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 399 struct resource *r) 400 { 401 /* 402 * If this is a memory resource, map it into the kernel. 403 */ 404 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) { 405 caddr_t vaddr = 0; 406 407 if (r->r_end < 1024 * 1024) { 408 /* 409 * The first 1Mb is mapped at KERNBASE. 410 */ 411 vaddr = (caddr_t)(uintptr_t)(KERNBASE + r->r_start); 412 } else { 413 u_int32_t paddr; 414 u_int32_t psize; 415 u_int32_t poffs; 416 417 paddr = r->r_start; 418 psize = r->r_end - r->r_start; 419 420 poffs = paddr - trunc_page(paddr); 421 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 422 } 423 rman_set_virtual(r, vaddr); 424 #ifdef PC98 425 /* PC-98: the type of bus_space_handle_t is the structure. */ 426 r->r_bushandle->bsh_base = (bus_addr_t) vaddr; 427 #else 428 /* IBM-PC: the type of bus_space_handle_t is u_int */ 429 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 430 #endif 431 } 432 return (rman_activate_resource(r)); 433 } 434 435 static int 436 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 437 struct resource *r) 438 { 439 /* 440 * If this is a memory resource, unmap it. 441 */ 442 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) && (r->r_end >= 1024 * 1024)) { 443 u_int32_t psize; 444 445 psize = r->r_end - r->r_start; 446 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize); 447 } 448 449 return (rman_deactivate_resource(r)); 450 } 451 452 static int 453 nexus_release_resource(device_t bus, device_t child, int type, int rid, 454 struct resource *r) 455 { 456 if (r->r_flags & RF_ACTIVE) { 457 int error = bus_deactivate_resource(child, type, rid, r); 458 if (error) 459 return error; 460 } 461 #ifdef PC98 462 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 463 i386_bus_space_handle_free(r->r_bustag, r->r_bushandle, 464 r->r_bushandle->bsh_sz); 465 } 466 #endif 467 return (rman_release_resource(r)); 468 } 469 470 /* 471 * Currently this uses the really grody interface from kern/kern_intr.c 472 * (which really doesn't belong in kern/anything.c). Eventually, all of 473 * the code in kern_intr.c and machdep_intr.c should get moved here, since 474 * this is going to be the official interface. 475 */ 476 static int 477 nexus_setup_intr(device_t bus, device_t child, struct resource *irq, 478 int flags, void (*ihand)(void *), void *arg, void **cookiep) 479 { 480 intrmask_t *mask; 481 driver_t *driver; 482 int error, icflags; 483 484 /* somebody tried to setup an irq that failed to allocate! */ 485 if (irq == NULL) 486 panic("nexus_setup_intr: NULL irq resource!"); 487 488 *cookiep = 0; 489 if (irq->r_flags & RF_SHAREABLE) 490 icflags = 0; 491 else 492 icflags = INTR_EXCL; 493 494 driver = device_get_driver(child); 495 switch (flags & ~INTR_TYPE_FAST) { 496 case INTR_TYPE_TTY: 497 mask = &tty_imask; 498 break; 499 case INTR_TYPE_BIO: 500 mask = &bio_imask; 501 break; 502 case INTR_TYPE_NET: 503 mask = &net_imask; 504 break; 505 case INTR_TYPE_CAM: 506 mask = &cam_imask; 507 break; 508 case INTR_TYPE_MISC: 509 mask = 0; 510 break; 511 default: 512 panic("still using grody create_intr interface"); 513 } 514 if (flags & INTR_TYPE_FAST) 515 icflags |= INTR_FAST; 516 517 /* 518 * We depend here on rman_activate_resource() being idempotent. 519 */ 520 error = rman_activate_resource(irq); 521 if (error) 522 return (error); 523 524 *cookiep = inthand_add(device_get_nameunit(child), irq->r_start, 525 ihand, arg, mask, icflags); 526 if (*cookiep == NULL) 527 error = EINVAL; /* XXX ??? */ 528 529 return (error); 530 } 531 532 static int 533 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 534 { 535 return (inthand_remove(ih)); 536 } 537 538 static int 539 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count) 540 { 541 struct nexus_device *ndev = DEVTONX(child); 542 struct resource_list *rl = &ndev->nx_resources; 543 544 /* XXX this should return a success/failure indicator */ 545 resource_list_add(rl, type, rid, start, start + count - 1, count); 546 return(0); 547 } 548 549 static int 550 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp) 551 { 552 struct nexus_device *ndev = DEVTONX(child); 553 struct resource_list *rl = &ndev->nx_resources; 554 struct resource_list_entry *rle; 555 556 rle = resource_list_find(rl, type, rid); 557 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n", 558 type, rid, startp, countp, rle); 559 if (!rle) 560 return(ENOENT); 561 if (startp) 562 *startp = rle->start; 563 if (countp) 564 *countp = rle->count; 565 return(0); 566 } 567 568 static void 569 nexus_delete_resource(device_t dev, device_t child, int type, int rid) 570 { 571 struct nexus_device *ndev = DEVTONX(child); 572 struct resource_list *rl = &ndev->nx_resources; 573 574 resource_list_delete(rl, type, rid); 575 }
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