1 /* 2 * Copyright 1998 Massachusetts Institute of Technology 3 * Copyright (c) 2008 The DragonFly Project. 4 * 5 * Permission to use, copy, modify, and distribute this software and 6 * its documentation for any purpose and without fee is hereby 7 * granted, provided that both the above copyright notice and this 8 * permission notice appear in all copies, that both the above 9 * copyright notice and this permission notice appear in all 10 * supporting documentation, and that the name of M.I.T. not be used 11 * in advertising or publicity pertaining to distribution of the 12 * software without specific, written prior permission. M.I.T. makes 13 * no representations about the suitability of this software for any 14 * purpose. It is provided "as is" without express or implied 15 * warranty. 16 * 17 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 18 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 21 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 24 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 27 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: src/sys/i386/i386/nexus.c,v 1.26.2.10 2003/02/22 13:16:45 imp Exp $ 31 */ 32 33 /* 34 * This code implements a `root nexus' for Intel Architecture 35 * machines. The function of the root nexus is to serve as an 36 * attachment point for both processors and buses, and to manage 37 * resources which are common to all of them. In particular, 38 * this code implements the core resource managers for interrupt 39 * requests, DMA requests (which rightfully should be a part of the 40 * ISA code but it's easier to do it here for now), I/O port addresses, 41 * and I/O memory address space. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/bus.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #include <sys/rman.h> 51 #include <sys/interrupt.h> 52 #include <sys/machintr.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/nexusvar.h> 60 #include <machine/smp.h> 61 #include <machine/intr_machdep.h> 62 #include <machine_base/apic/lapic.h> 63 #include <machine_base/apic/ioapic.h> 64 65 #include "pcib_if.h" 66 67 #define I386_BUS_SPACE_IO 0 /* space is i/o space */ 68 #define I386_BUS_SPACE_MEM 1 /* space is mem space */ 69 70 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 71 struct nexus_device { 72 struct resource_list nx_resources; 73 int nx_pcibus; 74 }; 75 76 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 77 78 static struct rman irq_rman[MAXCPU], drq_rman, port_rman, mem_rman; 79 80 static int nexus_probe(device_t); 81 static int nexus_attach(device_t); 82 static int nexus_print_all_resources(device_t dev); 83 static int nexus_print_child(device_t, device_t); 84 static device_t nexus_add_child(device_t bus, device_t parent, int order, 85 const char *name, int unit); 86 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 87 u_long, u_long, u_long, u_int, int); 88 static int nexus_read_ivar(device_t, device_t, int, uintptr_t *); 89 static int nexus_write_ivar(device_t, device_t, int, uintptr_t); 90 static int nexus_activate_resource(device_t, device_t, int, int, 91 struct resource *); 92 static int nexus_deactivate_resource(device_t, device_t, int, int, 93 struct resource *); 94 static int nexus_release_resource(device_t, device_t, int, int, 95 struct resource *); 96 static int nexus_config_intr(device_t, device_t, int, enum intr_trigger, 97 enum intr_polarity); 98 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags, 99 void (*)(void *), void *, void **, lwkt_serialize_t, 100 const char *); 101 static int nexus_teardown_intr(device_t, device_t, struct resource *, 102 void *); 103 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long, 104 int); 105 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *); 106 static void nexus_delete_resource(device_t, device_t, int, int); 107 108 static int nexus_alloc_msi(device_t, device_t, int, int, int *, int); 109 static int nexus_release_msi(device_t, device_t, int, int *, int); 110 static int nexus_map_msi(device_t, device_t, int, uint64_t *, uint32_t *, int); 111 static int nexus_alloc_msix(device_t, device_t, int *, int); 112 static int nexus_release_msix(device_t, device_t, int, int); 113 114 /* 115 * The device_identify method will cause nexus to automatically associate 116 * and attach to the root bus. 117 */ 118 static device_method_t nexus_methods[] = { 119 /* Device interface */ 120 DEVMETHOD(device_identify, bus_generic_identify), 121 DEVMETHOD(device_probe, nexus_probe), 122 DEVMETHOD(device_attach, nexus_attach), 123 DEVMETHOD(device_detach, bus_generic_detach), 124 DEVMETHOD(device_shutdown, bus_generic_shutdown), 125 DEVMETHOD(device_suspend, bus_generic_suspend), 126 DEVMETHOD(device_resume, bus_generic_resume), 127 128 /* Bus interface */ 129 DEVMETHOD(bus_print_child, nexus_print_child), 130 DEVMETHOD(bus_add_child, nexus_add_child), 131 DEVMETHOD(bus_read_ivar, nexus_read_ivar), 132 DEVMETHOD(bus_write_ivar, nexus_write_ivar), 133 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 134 DEVMETHOD(bus_release_resource, nexus_release_resource), 135 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 136 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 137 DEVMETHOD(bus_config_intr, nexus_config_intr), 138 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 139 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 140 DEVMETHOD(bus_set_resource, nexus_set_resource), 141 DEVMETHOD(bus_get_resource, nexus_get_resource), 142 DEVMETHOD(bus_delete_resource, nexus_delete_resource), 143 144 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi), 145 DEVMETHOD(pcib_release_msi, nexus_release_msi), 146 DEVMETHOD(pcib_map_msi, nexus_map_msi), 147 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix), 148 DEVMETHOD(pcib_release_msix, nexus_release_msix), 149 150 { 0, 0 } 151 }; 152 153 static driver_t nexus_driver = { 154 "nexus", 155 nexus_methods, 156 1, /* no softc */ 157 }; 158 static devclass_t nexus_devclass; 159 160 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, NULL, NULL); 161 162 static int 163 nexus_probe(device_t dev) 164 { 165 int cpuid; 166 167 device_quiet(dev); /* suppress attach message for neatness */ 168 169 for (cpuid = 0; cpuid < ncpus; ++cpuid) { 170 struct rman *rm = &irq_rman[cpuid]; 171 172 rm->rm_start = 0; 173 rm->rm_end = IDT_HWI_VECTORS - 1; 174 rm->rm_type = RMAN_ARRAY; 175 rm->rm_descr = "Interrupt request lines"; 176 177 if (rman_init(rm, cpuid)) 178 panic("nexus_probe rman_init"); 179 MachIntrABI.rman_setup(rm); 180 } 181 182 /* 183 * ISA DMA on PCI systems is implemented in the ISA part of each 184 * PCI->ISA bridge and the channels can be duplicated if there are 185 * multiple bridges. (eg: laptops with docking stations) 186 */ 187 drq_rman.rm_start = 0; 188 drq_rman.rm_end = 7; 189 drq_rman.rm_type = RMAN_ARRAY; 190 drq_rman.rm_descr = "DMA request lines"; 191 /* XXX drq 0 not available on some machines */ 192 if (rman_init(&drq_rman, -1) 193 || rman_manage_region(&drq_rman, 194 drq_rman.rm_start, drq_rman.rm_end)) 195 panic("nexus_probe drq_rman"); 196 197 /* 198 * However, IO ports and Memory truely are global at this level, 199 * as are APIC interrupts (however many IO APICS there turn out 200 * to be on large systems..) 201 */ 202 port_rman.rm_start = 0; 203 port_rman.rm_end = 0xffff; 204 port_rman.rm_type = RMAN_ARRAY; 205 port_rman.rm_descr = "I/O ports"; 206 if (rman_init(&port_rman, -1) 207 || rman_manage_region(&port_rman, 0, 0xffff)) 208 panic("nexus_probe port_rman"); 209 210 mem_rman.rm_start = 0; 211 mem_rman.rm_end = ~0u; 212 mem_rman.rm_type = RMAN_ARRAY; 213 mem_rman.rm_descr = "I/O memory addresses"; 214 if (rman_init(&mem_rman, -1) 215 || rman_manage_region(&mem_rman, 0, ~0)) 216 panic("nexus_probe mem_rman"); 217 218 return bus_generic_probe(dev); 219 } 220 221 static int 222 nexus_attach(device_t dev) 223 { 224 device_t child; 225 226 /* 227 * First, let our child driver's identify any child devices that 228 * they can find. Once that is done attach any devices that we 229 * found. 230 */ 231 #if 0 /* FUTURE */ 232 bus_generic_probe(dev); 233 #endif 234 bus_generic_attach(dev); 235 236 /* 237 * And if we didn't see ISA on a pci bridge, create a 238 * connection point now so it shows up "on motherboard". 239 */ 240 if (!devclass_get_device(devclass_find("isa"), 0)) { 241 child = BUS_ADD_CHILD(dev, dev, 0, "isa", 0); 242 if (child == NULL) 243 panic("nexus_attach isa"); 244 device_probe_and_attach(child); 245 } 246 247 return 0; 248 } 249 250 static int 251 nexus_print_all_resources(device_t dev) 252 { 253 struct nexus_device *ndev = DEVTONX(dev); 254 struct resource_list *rl = &ndev->nx_resources; 255 int retval = 0; 256 257 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1) 258 retval += kprintf(" at"); 259 260 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx"); 261 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx"); 262 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld"); 263 264 return retval; 265 } 266 267 static int 268 nexus_print_child(device_t bus, device_t child) 269 { 270 struct nexus_device *ndev = DEVTONX(child); 271 int retval = 0; 272 273 retval += bus_print_child_header(bus, child); 274 retval += nexus_print_all_resources(child); 275 if (ndev->nx_pcibus != -1) 276 retval += kprintf(" pcibus %d", ndev->nx_pcibus); 277 retval += kprintf(" on motherboard\n"); 278 279 return (retval); 280 } 281 282 static device_t 283 nexus_add_child(device_t bus, device_t parent, int order, 284 const char *name, int unit) 285 { 286 device_t child; 287 struct nexus_device *ndev; 288 289 ndev = kmalloc(sizeof(struct nexus_device), M_NEXUSDEV, M_INTWAIT|M_ZERO); 290 resource_list_init(&ndev->nx_resources); 291 ndev->nx_pcibus = -1; 292 293 child = device_add_child_ordered(parent, order, name, unit); 294 295 /* should we free this in nexus_child_detached? */ 296 device_set_ivars(child, ndev); 297 298 return(child); 299 } 300 301 static int 302 nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 303 { 304 struct nexus_device *ndev = DEVTONX(child); 305 306 switch (which) { 307 case NEXUS_IVAR_PCIBUS: 308 *result = ndev->nx_pcibus; 309 break; 310 default: 311 return ENOENT; 312 } 313 return 0; 314 } 315 316 static int 317 nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 318 { 319 struct nexus_device *ndev = DEVTONX(child); 320 321 switch (which) { 322 case NEXUS_IVAR_PCIBUS: 323 ndev->nx_pcibus = value; 324 break; 325 default: 326 return ENOENT; 327 } 328 return 0; 329 } 330 331 /* 332 * Allocate a resource on behalf of child. NB: child is usually going to be a 333 * child of one of our descendants, not a direct child of nexus0. 334 * (Exceptions include npx.) 335 */ 336 static struct resource * 337 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 338 u_long start, u_long end, u_long count, u_int flags, int cpuid) 339 { 340 struct nexus_device *ndev = DEVTONX(child); 341 struct resource *rv; 342 struct resource_list_entry *rle; 343 struct rman *rm; 344 int needactivate = flags & RF_ACTIVE; 345 346 /* 347 * If this is an allocation of the "default" range for a given RID, and 348 * we know what the resources for this device are (ie. they aren't maintained 349 * by a child bus), then work out the start/end values. 350 */ 351 if ((start == 0UL) && (end == ~0UL) && (count == 1)) { 352 if (ndev == NULL) 353 return(NULL); 354 rle = resource_list_find(&ndev->nx_resources, type, *rid); 355 if (rle == NULL) 356 return(NULL); 357 start = rle->start; 358 end = rle->end; 359 count = rle->count; 360 cpuid = rle->cpuid; 361 } 362 363 flags &= ~RF_ACTIVE; 364 365 switch (type) { 366 case SYS_RES_IRQ: 367 KASSERT(cpuid >= 0 && cpuid < ncpus, 368 ("nexus invalid cpuid: %d", cpuid)); 369 rm = &irq_rman[cpuid]; 370 break; 371 372 case SYS_RES_DRQ: 373 rm = &drq_rman; 374 break; 375 376 case SYS_RES_IOPORT: 377 rm = &port_rman; 378 break; 379 380 case SYS_RES_MEMORY: 381 rm = &mem_rman; 382 break; 383 384 default: 385 return 0; 386 } 387 388 rv = rman_reserve_resource(rm, start, end, count, flags, child); 389 if (rv == NULL) 390 return 0; 391 rman_set_rid(rv, *rid); 392 393 if (type == SYS_RES_MEMORY) { 394 rman_set_bustag(rv, I386_BUS_SPACE_MEM); 395 } else if (type == SYS_RES_IOPORT) { 396 rman_set_bustag(rv, I386_BUS_SPACE_IO); 397 rman_set_bushandle(rv, rv->r_start); 398 } 399 400 if (needactivate) { 401 if (bus_activate_resource(child, type, *rid, rv)) { 402 rman_release_resource(rv); 403 return 0; 404 } 405 } 406 407 return rv; 408 } 409 410 static int 411 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 412 struct resource *r) 413 { 414 /* 415 * If this is a memory resource, map it into the kernel. 416 */ 417 if (rman_get_bustag(r) == I386_BUS_SPACE_MEM) { 418 caddr_t vaddr = 0; 419 420 if (rman_get_end(r) < 1024 * 1024) { 421 /* 422 * The first 1Mb is mapped at KERNBASE. 423 */ 424 vaddr = (caddr_t)(uintptr_t)(KERNBASE + rman_get_start(r)); 425 } else { 426 u_int64_t paddr; 427 u_int64_t psize; 428 u_int32_t poffs; 429 430 paddr = rman_get_start(r); 431 psize = rman_get_size(r); 432 433 poffs = paddr - trunc_page(paddr); 434 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs; 435 } 436 rman_set_virtual(r, vaddr); 437 /* IBM-PC: the type of bus_space_handle_t is u_int */ 438 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 439 } 440 return (rman_activate_resource(r)); 441 } 442 443 static int 444 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 445 struct resource *r) 446 { 447 /* 448 * If this is a memory resource, unmap it. 449 */ 450 if ((rman_get_bustag(r) == I386_BUS_SPACE_MEM) && 451 (rman_get_end(r) >= 1024 * 1024)) { 452 u_int32_t psize; 453 454 psize = rman_get_size(r); 455 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize); 456 } 457 458 return (rman_deactivate_resource(r)); 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 if (rman_get_flags(r) & RF_ACTIVE) { 466 int error = bus_deactivate_resource(child, type, rid, r); 467 if (error) 468 return error; 469 } 470 return (rman_release_resource(r)); 471 } 472 473 static int 474 nexus_config_intr(device_t bus, device_t chile, int irq, 475 enum intr_trigger trig, enum intr_polarity pola) 476 { 477 machintr_legacy_intr_config(irq, trig, pola); 478 return 0; 479 } 480 481 /* 482 * Currently this uses the really grody interface from kern/kern_intr.c 483 * (which really doesn't belong in kern/anything.c). Eventually, all of 484 * the code in kern_intr.c and machdep_intr.c should get moved here, since 485 * this is going to be the official interface. 486 */ 487 static int 488 nexus_setup_intr(device_t bus, device_t child, struct resource *irq, 489 int flags, void (*ihand)(void *), void *arg, void **cookiep, 490 lwkt_serialize_t serializer, const char *desc) 491 { 492 int error, icflags; 493 494 /* somebody tried to setup an irq that failed to allocate! */ 495 if (irq == NULL) 496 panic("nexus_setup_intr: NULL irq resource!"); 497 498 *cookiep = NULL; 499 icflags = flags; 500 if ((irq->r_flags & RF_SHAREABLE) == 0) 501 icflags |= INTR_EXCL; 502 503 /* 504 * We depend here on rman_activate_resource() being idempotent. 505 */ 506 error = rman_activate_resource(irq); 507 if (error) 508 return (error); 509 510 /* Use device name, if description is not specified */ 511 if (desc == NULL) 512 desc = device_get_nameunit(child); 513 514 /* 515 * XXX cast the interrupt handler function to an inthand2_t. The 516 * difference is that an additional frame argument is passed which 517 * we do not currently want to expose the BUS subsystem to. 518 */ 519 *cookiep = register_int(irq->r_start, (inthand2_t *)ihand, arg, 520 desc, serializer, icflags, rman_get_cpuid(irq)); 521 if (*cookiep == NULL) 522 error = EINVAL; 523 return (error); 524 } 525 526 static int 527 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 528 { 529 if (ih) { 530 unregister_int(ih, rman_get_cpuid(r)); 531 return (0); 532 } 533 return(-1); 534 } 535 536 static int 537 nexus_set_resource(device_t dev, device_t child, int type, int rid, 538 u_long start, u_long count, int cpuid) 539 { 540 struct nexus_device *ndev = DEVTONX(child); 541 struct resource_list *rl = &ndev->nx_resources; 542 543 /* XXX this should return a success/failure indicator */ 544 resource_list_add(rl, type, rid, start, start + count - 1, count, 545 cpuid); 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 } 576 577 static int 578 nexus_alloc_msi(device_t dev, device_t child, int count, int maxcount, 579 int *irqs, int cpuid) 580 { 581 if (!lapic_enable) 582 return ENODEV; 583 584 return MachIntrABI.msi_alloc(irqs, count, cpuid); 585 } 586 587 static int 588 nexus_release_msi(device_t dev, device_t child, int count, int *irqs, int cpuid) 589 { 590 KKASSERT(lapic_enable); 591 MachIntrABI.msi_release(irqs, count, cpuid); 592 return 0; 593 } 594 595 static int 596 nexus_map_msi(device_t dev, device_t child, int irq, uint64_t *addr, 597 uint32_t *data, int cpuid) 598 { 599 KKASSERT(lapic_enable); 600 MachIntrABI.msi_map(irq, addr, data, cpuid); 601 return 0; 602 } 603 604 static int 605 nexus_alloc_msix(device_t dev, device_t child, int *irq, int cpuid) 606 { 607 if (!lapic_enable) 608 return ENODEV; 609 610 return MachIntrABI.msix_alloc(irq, cpuid); 611 } 612 613 static int 614 nexus_release_msix(device_t dev, device_t child, int irq, int cpuid) 615 { 616 KKASSERT(lapic_enable); 617 MachIntrABI.msix_release(irq, cpuid); 618 return 0; 619 } 620