nexus.c revision 92668
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: head/sys/ia64/ia64/nexus.c 92668 2002-03-19 11:05:07Z peter $ 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 <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 <machine/bus.h> 50#include <sys/rman.h> 51#include <sys/interrupt.h> 52#include <machine/intr.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/resource.h> 61 62#include <isa/isareg.h> 63#include <sys/rtprio.h> 64 65static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 66struct nexus_device { 67 struct resource_list nx_resources; 68 int nx_pcibus; 69}; 70 71#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 72 73static struct rman irq_rman, drq_rman, port_rman, mem_rman; 74 75static int nexus_probe(device_t); 76static int nexus_attach(device_t); 77static int nexus_print_resources(struct resource_list *rl, const char *name, int type, 78 const char *format); 79static int nexus_print_all_resources(device_t dev); 80static int nexus_print_child(device_t, device_t); 81static device_t nexus_add_child(device_t bus, int order, const char *name, 82 int unit); 83static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 84 u_long, u_long, u_long, u_int); 85static int nexus_read_ivar(device_t, device_t, int, uintptr_t *); 86static int nexus_write_ivar(device_t, device_t, int, uintptr_t); 87static int nexus_activate_resource(device_t, device_t, int, int, 88 struct resource *); 89static int nexus_deactivate_resource(device_t, device_t, int, int, 90 struct resource *); 91static int nexus_release_resource(device_t, device_t, int, int, 92 struct resource *); 93static int nexus_setup_intr(device_t, device_t, struct resource *, int flags, 94 void (*)(void *), void *, void **); 95static int nexus_teardown_intr(device_t, device_t, struct resource *, 96 void *); 97static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long); 98static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *); 99static void nexus_delete_resource(device_t, device_t, int, int); 100 101static device_method_t nexus_methods[] = { 102 /* Device interface */ 103 DEVMETHOD(device_probe, nexus_probe), 104 DEVMETHOD(device_attach, nexus_attach), 105 DEVMETHOD(device_detach, bus_generic_detach), 106 DEVMETHOD(device_shutdown, bus_generic_shutdown), 107 DEVMETHOD(device_suspend, bus_generic_suspend), 108 DEVMETHOD(device_resume, bus_generic_resume), 109 110 /* Bus interface */ 111 DEVMETHOD(bus_print_child, nexus_print_child), 112 DEVMETHOD(bus_add_child, nexus_add_child), 113 DEVMETHOD(bus_read_ivar, nexus_read_ivar), 114 DEVMETHOD(bus_write_ivar, nexus_write_ivar), 115 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 116 DEVMETHOD(bus_release_resource, nexus_release_resource), 117 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 118 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 119 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 120 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 121 DEVMETHOD(bus_set_resource, nexus_set_resource), 122 DEVMETHOD(bus_get_resource, nexus_get_resource), 123 DEVMETHOD(bus_delete_resource, nexus_delete_resource), 124 125 { 0, 0 } 126}; 127 128static driver_t nexus_driver = { 129 "nexus", 130 nexus_methods, 131 1, /* no softc */ 132}; 133static devclass_t nexus_devclass; 134 135DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 136 137static int 138nexus_probe(device_t dev) 139{ 140 141 device_quiet(dev); /* suppress attach message for neatness */ 142 143 /* 144 * XXX working notes: 145 * 146 * - IRQ resource creation should be moved to the PIC/APIC driver. 147 * - DRQ resource creation should be moved to the DMAC driver. 148 * - The above should be sorted to probe earlier than any child busses. 149 * 150 * - Leave I/O and memory creation here, as child probes may need them. 151 * (especially eg. ACPI) 152 */ 153 154 /* 155 * IRQ's are on the mainboard on old systems, but on the ISA part 156 * of PCI->ISA bridges. There would be multiple sets of IRQs on 157 * multi-ISA-bus systems. PCI interrupts are routed to the ISA 158 * component, so in a way, PCI can be a partial child of an ISA bus(!). 159 * APIC interrupts are global though. 160 * 161 * XXX We depend on the AT PIC driver correctly claiming IRQ 2 162 * to prevent its reuse elsewhere in the !APIC_IO case. 163 */ 164 irq_rman.rm_start = 0; 165 irq_rman.rm_type = RMAN_ARRAY; 166 irq_rman.rm_descr = "Interrupt request lines"; 167 irq_rman.rm_end = 63; 168 if (rman_init(&irq_rman) 169 || rman_manage_region(&irq_rman, 170 irq_rman.rm_start, irq_rman.rm_end)) 171 panic("nexus_probe irq_rman"); 172 173 /* 174 * ISA DMA on PCI systems is implemented in the ISA part of each 175 * PCI->ISA bridge and the channels can be duplicated if there are 176 * multiple bridges. (eg: laptops with docking stations) 177 */ 178 drq_rman.rm_start = 0; 179 drq_rman.rm_end = 7; 180 drq_rman.rm_type = RMAN_ARRAY; 181 drq_rman.rm_descr = "DMA request lines"; 182 /* XXX drq 0 not available on some machines */ 183 if (rman_init(&drq_rman) 184 || rman_manage_region(&drq_rman, 185 drq_rman.rm_start, drq_rman.rm_end)) 186 panic("nexus_probe drq_rman"); 187 188 /* 189 * However, IO ports and Memory truely are global at this level, 190 * as are APIC interrupts (however many IO APICS there turn out 191 * to be on large systems..) 192 */ 193 port_rman.rm_start = 0; 194 port_rman.rm_end = 0xffff; 195 port_rman.rm_type = RMAN_ARRAY; 196 port_rman.rm_descr = "I/O ports"; 197 if (rman_init(&port_rman) 198 || rman_manage_region(&port_rman, 0, 0xffff)) 199 panic("nexus_probe port_rman"); 200 201 mem_rman.rm_start = 0; 202 mem_rman.rm_end = ~0u; 203 mem_rman.rm_type = RMAN_ARRAY; 204 mem_rman.rm_descr = "I/O memory addresses"; 205 if (rman_init(&mem_rman) 206 || rman_manage_region(&mem_rman, 0, ~0)) 207 panic("nexus_probe mem_rman"); 208 209 return bus_generic_probe(dev); 210} 211 212static int 213nexus_attach(device_t dev) 214{ 215 /* 216 * Mask the legacy PICs - we will use the I/O SAPIC for interrupt. 217 */ 218 outb(IO_ICU1+1, 0xff); 219 outb(IO_ICU2+1, 0xff); 220 221 bus_generic_attach(dev); 222 return 0; 223} 224 225static int 226nexus_print_resources(struct resource_list *rl, const char *name, int type, 227 const char *format) 228{ 229 struct resource_list_entry *rle; 230 int printed, retval; 231 232 printed = 0; 233 retval = 0; 234 /* Yes, this is kinda cheating */ 235 SLIST_FOREACH(rle, rl, link) { 236 if (rle->type == type) { 237 if (printed == 0) 238 retval += printf(" %s ", name); 239 else if (printed > 0) 240 retval += printf(","); 241 printed++; 242 retval += printf(format, rle->start); 243 if (rle->count > 1) { 244 retval += printf("-"); 245 retval += printf(format, rle->start + 246 rle->count - 1); 247 } 248 } 249 } 250 return retval; 251} 252 253static int 254nexus_print_all_resources(device_t dev) 255{ 256 struct nexus_device *ndev = DEVTONX(dev); 257 struct resource_list *rl = &ndev->nx_resources; 258 int retval = 0; 259 260 if (SLIST_FIRST(rl) || ndev->nx_pcibus != -1) 261 retval += printf(" at"); 262 263 retval += nexus_print_resources(rl, "port", SYS_RES_IOPORT, "%#lx"); 264 retval += nexus_print_resources(rl, "iomem", SYS_RES_MEMORY, "%#lx"); 265 retval += nexus_print_resources(rl, "irq", SYS_RES_IRQ, "%ld"); 266 267 return retval; 268} 269 270static int 271nexus_print_child(device_t bus, device_t child) 272{ 273 struct nexus_device *ndev = DEVTONX(child); 274 int retval = 0; 275 276 retval += bus_print_child_header(bus, child); 277 retval += nexus_print_all_resources(child); 278 if (ndev->nx_pcibus != -1) 279 retval += printf(" pcibus %d", ndev->nx_pcibus); 280 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 281 282 return (retval); 283} 284 285static device_t 286nexus_add_child(device_t bus, int order, const char *name, int unit) 287{ 288 device_t child; 289 struct nexus_device *ndev; 290 291 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 292 if (!ndev) 293 return(0); 294 resource_list_init(&ndev->nx_resources); 295 ndev->nx_pcibus = -1; 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 305static int 306nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 307{ 308 struct nexus_device *ndev = DEVTONX(child); 309 310 switch (which) { 311 case NEXUS_IVAR_PCIBUS: 312 *result = ndev->nx_pcibus; 313 break; 314 default: 315 return ENOENT; 316 } 317 return 0; 318} 319 320 321static int 322nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 323{ 324 struct nexus_device *ndev = DEVTONX(child); 325 326 switch (which) { 327 case NEXUS_IVAR_PCIBUS: 328 ndev->nx_pcibus = value; 329 break; 330 default: 331 return ENOENT; 332 } 333 return 0; 334} 335 336 337/* 338 * Allocate a resource on behalf of child. NB: child is usually going to be a 339 * child of one of our descendants, not a direct child of nexus0. 340 * (Exceptions include npx.) 341 */ 342static struct resource * 343nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 344 u_long start, u_long end, u_long count, u_int flags) 345{ 346 struct nexus_device *ndev = DEVTONX(child); 347 struct resource *rv; 348 struct resource_list_entry *rle; 349 struct rman *rm; 350 int needactivate = flags & RF_ACTIVE; 351 352 /* 353 * If this is an allocation of the "default" range for a given RID, and 354 * we know what the resources for this device are (ie. they aren't maintained 355 * by a child bus), then work out the start/end values. 356 */ 357 if ((start == 0UL) && (end == ~0UL) && (count == 1)) { 358 if (ndev == NULL) 359 return(NULL); 360 rle = resource_list_find(&ndev->nx_resources, type, *rid); 361 if (rle == NULL) 362 return(NULL); 363 start = rle->start; 364 end = rle->end; 365 count = rle->count; 366 } 367 368 flags &= ~RF_ACTIVE; 369 370 switch (type) { 371 case SYS_RES_IRQ: 372 rm = &irq_rman; 373 break; 374 375 case SYS_RES_DRQ: 376 rm = &drq_rman; 377 break; 378 379 case SYS_RES_IOPORT: 380 rm = &port_rman; 381 break; 382 383 case SYS_RES_MEMORY: 384 rm = &mem_rman; 385 break; 386 387 default: 388 return 0; 389 } 390 391 rv = rman_reserve_resource(rm, start, end, count, flags, child); 392 if (rv == 0) 393 return 0; 394 395 if (type == SYS_RES_MEMORY) { 396 rman_set_bustag(rv, IA64_BUS_SPACE_MEM); 397 } else if (type == SYS_RES_IOPORT) { 398 rman_set_bustag(rv, IA64_BUS_SPACE_IO); 399 /* IBM-PC: the type of bus_space_handle_t is u_int */ 400 rman_set_bushandle(rv, rv->r_start); 401 } 402 403 if (needactivate) { 404 if (bus_activate_resource(child, type, *rid, rv)) { 405 rman_release_resource(rv); 406 return 0; 407 } 408 } 409 410 return rv; 411} 412 413static int 414nexus_activate_resource(device_t bus, device_t child, int type, int rid, 415 struct resource *r) 416{ 417 /* 418 * If this is a memory resource, map it into the kernel. 419 */ 420 if (rman_get_bustag(r) == IA64_BUS_SPACE_MEM) { 421 vm_offset_t paddr = rman_get_start(r); 422 vm_offset_t psize = rman_get_size(r); 423 caddr_t vaddr = 0; 424 425 vaddr = pmap_mapdev(paddr, psize); 426 rman_set_virtual(r, vaddr); 427 rman_set_bushandle(r, (bus_space_handle_t) paddr); 428 } 429 return (rman_activate_resource(r)); 430} 431 432static int 433nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 434 struct resource *r) 435{ 436 437 return (rman_deactivate_resource(r)); 438} 439 440static int 441nexus_release_resource(device_t bus, device_t child, int type, int rid, 442 struct resource *r) 443{ 444 if (rman_get_flags(r) & RF_ACTIVE) { 445 int error = bus_deactivate_resource(child, type, rid, r); 446 if (error) 447 return error; 448 } 449 return (rman_release_resource(r)); 450} 451 452/* 453 * Currently this uses the really grody interface from kern/kern_intr.c 454 * (which really doesn't belong in kern/anything.c). Eventually, all of 455 * the code in kern_intr.c and machdep_intr.c should get moved here, since 456 * this is going to be the official interface. 457 */ 458static int 459nexus_setup_intr(device_t bus, device_t child, struct resource *irq, 460 int flags, void (*ihand)(void *), void *arg, void **cookiep) 461{ 462 driver_t *driver; 463 int error; 464 465 /* somebody tried to setup an irq that failed to allocate! */ 466 if (irq == NULL) 467 panic("nexus_setup_intr: NULL irq resource!"); 468 469 *cookiep = 0; 470 if ((irq->r_flags & RF_SHAREABLE) == 0) 471 flags |= INTR_EXCL; 472 473 driver = device_get_driver(child); 474 475 /* 476 * We depend here on rman_activate_resource() being idempotent. 477 */ 478 error = rman_activate_resource(irq); 479 if (error) 480 return (error); 481 482 error = ia64_setup_intr(device_get_nameunit(child), irq->r_start, 483 ihand, arg, flags, cookiep, 0); 484 485 return (error); 486} 487 488static int 489nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 490{ 491#if 0 492 return (inthand_remove(ih)); 493#else 494 return 0; 495#endif 496} 497 498static int 499nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count) 500{ 501 struct nexus_device *ndev = DEVTONX(child); 502 struct resource_list *rl = &ndev->nx_resources; 503 504 /* XXX this should return a success/failure indicator */ 505 resource_list_add(rl, type, rid, start, start + count - 1, count); 506 return(0); 507} 508 509static int 510nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp) 511{ 512 struct nexus_device *ndev = DEVTONX(child); 513 struct resource_list *rl = &ndev->nx_resources; 514 struct resource_list_entry *rle; 515 516 rle = resource_list_find(rl, type, rid); 517 device_printf(child, "type %d rid %d startp %p countp %p - got %p\n", 518 type, rid, startp, countp, rle); 519 if (!rle) 520 return(ENOENT); 521 if (startp) 522 *startp = rle->start; 523 if (countp) 524 *countp = rle->count; 525 return(0); 526} 527 528static void 529nexus_delete_resource(device_t dev, device_t child, int type, int rid) 530{ 531 struct nexus_device *ndev = DEVTONX(child); 532 struct resource_list *rl = &ndev->nx_resources; 533 534 resource_list_delete(rl, type, rid); 535} 536 537#if 0 538 539/* 540 * Placeholder which claims PnP 'devices' which describe system 541 * resources. 542 */ 543static struct isa_pnp_id sysresource_ids[] = { 544 { 0x010cd041 /* PNP0c01 */, "System Memory" }, 545 { 0x020cd041 /* PNP0c02 */, "System Resource" }, 546 { 0 } 547}; 548 549static int 550sysresource_probe(device_t dev) 551{ 552 int result; 553 554 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) { 555 device_quiet(dev); 556 } 557 return(result); 558} 559 560static int 561sysresource_attach(device_t dev) 562{ 563 return(0); 564} 565 566static device_method_t sysresource_methods[] = { 567 /* Device interface */ 568 DEVMETHOD(device_probe, sysresource_probe), 569 DEVMETHOD(device_attach, sysresource_attach), 570 DEVMETHOD(device_detach, bus_generic_detach), 571 DEVMETHOD(device_shutdown, bus_generic_shutdown), 572 DEVMETHOD(device_suspend, bus_generic_suspend), 573 DEVMETHOD(device_resume, bus_generic_resume), 574 { 0, 0 } 575}; 576 577static driver_t sysresource_driver = { 578 "sysresource", 579 sysresource_methods, 580 1, /* no softc */ 581}; 582 583static devclass_t sysresource_devclass; 584 585DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0); 586 587#endif 588