Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/ofw/ofw_pci.c
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1 /*- 2 * Copyright (c) 2011 Nathan Whitehorn 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/11.1/sys/powerpc/ofw/ofw_pci.c 297000 2016-03-18 01:28:41Z jhibbits $"); 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/module.h> 32 #include <sys/bus.h> 33 #include <sys/conf.h> 34 #include <sys/kernel.h> 35 36 #include <dev/ofw/openfirm.h> 37 #include <dev/ofw/ofw_pci.h> 38 #include <dev/ofw/ofw_bus.h> 39 #include <dev/ofw/ofw_bus_subr.h> 40 41 #include <dev/pci/pcivar.h> 42 #include <dev/pci/pcireg.h> 43 44 #include <machine/bus.h> 45 #include <machine/intr_machdep.h> 46 #include <machine/md_var.h> 47 #include <machine/pio.h> 48 #include <machine/resource.h> 49 50 #include <sys/rman.h> 51 52 #include <vm/vm.h> 53 #include <vm/pmap.h> 54 55 #include <powerpc/ofw/ofw_pci.h> 56 57 #include "pcib_if.h" 58 59 /* 60 * Bus interface. 61 */ 62 static int ofw_pci_read_ivar(device_t, device_t, int, 63 uintptr_t *); 64 static struct resource * ofw_pci_alloc_resource(device_t bus, 65 device_t child, int type, int *rid, rman_res_t start, 66 rman_res_t end, rman_res_t count, u_int flags); 67 static int ofw_pci_release_resource(device_t bus, device_t child, 68 int type, int rid, struct resource *res); 69 static int ofw_pci_activate_resource(device_t bus, device_t child, 70 int type, int rid, struct resource *res); 71 static int ofw_pci_deactivate_resource(device_t bus, 72 device_t child, int type, int rid, 73 struct resource *res); 74 static int ofw_pci_adjust_resource(device_t bus, device_t child, 75 int type, struct resource *res, rman_res_t start, 76 rman_res_t end); 77 78 /* 79 * pcib interface. 80 */ 81 static int ofw_pci_maxslots(device_t); 82 static int ofw_pci_route_interrupt(device_t, device_t, int); 83 84 /* 85 * ofw_bus interface 86 */ 87 static phandle_t ofw_pci_get_node(device_t bus, device_t dev); 88 89 /* 90 * local methods 91 */ 92 93 static int ofw_pci_nranges(phandle_t node); 94 static int ofw_pci_fill_ranges(phandle_t node, struct ofw_pci_range *ranges); 95 96 /* 97 * Driver methods. 98 */ 99 static device_method_t ofw_pci_methods[] = { 100 /* Device interface */ 101 DEVMETHOD(device_attach, ofw_pci_attach), 102 103 /* Bus interface */ 104 DEVMETHOD(bus_print_child, bus_generic_print_child), 105 DEVMETHOD(bus_read_ivar, ofw_pci_read_ivar), 106 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 107 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 108 DEVMETHOD(bus_alloc_resource, ofw_pci_alloc_resource), 109 DEVMETHOD(bus_release_resource, ofw_pci_release_resource), 110 DEVMETHOD(bus_activate_resource, ofw_pci_activate_resource), 111 DEVMETHOD(bus_deactivate_resource, ofw_pci_deactivate_resource), 112 DEVMETHOD(bus_adjust_resource, ofw_pci_adjust_resource), 113 114 /* pcib interface */ 115 DEVMETHOD(pcib_maxslots, ofw_pci_maxslots), 116 DEVMETHOD(pcib_route_interrupt, ofw_pci_route_interrupt), 117 118 /* ofw_bus interface */ 119 DEVMETHOD(ofw_bus_get_node, ofw_pci_get_node), 120 121 DEVMETHOD_END 122 }; 123 124 DEFINE_CLASS_0(ofw_pci, ofw_pci_driver, ofw_pci_methods, 0); 125 126 int 127 ofw_pci_init(device_t dev) 128 { 129 struct ofw_pci_softc *sc; 130 phandle_t node; 131 u_int32_t busrange[2]; 132 struct ofw_pci_range *rp; 133 int error; 134 135 node = ofw_bus_get_node(dev); 136 sc = device_get_softc(dev); 137 sc->sc_initialized = 1; 138 139 if (OF_getencprop(node, "bus-range", busrange, sizeof(busrange)) != 8) 140 busrange[0] = 0; 141 142 sc->sc_dev = dev; 143 sc->sc_node = node; 144 sc->sc_bus = busrange[0]; 145 146 if (sc->sc_quirks & OFW_PCI_QUIRK_RANGES_ON_CHILDREN) { 147 phandle_t c; 148 int n, i; 149 150 sc->sc_nrange = 0; 151 for (c = OF_child(node); c != 0; c = OF_peer(c)) { 152 n = ofw_pci_nranges(c); 153 if (n > 0) 154 sc->sc_nrange += n; 155 } 156 if (sc->sc_nrange == 0) 157 return (ENXIO); 158 sc->sc_range = malloc(sc->sc_nrange * sizeof(sc->sc_range[0]), 159 M_DEVBUF, M_WAITOK); 160 i = 0; 161 for (c = OF_child(node); c != 0; c = OF_peer(c)) { 162 n = ofw_pci_fill_ranges(c, &sc->sc_range[i]); 163 if (n > 0) 164 i += n; 165 } 166 KASSERT(i == sc->sc_nrange, ("range count mismatch")); 167 } else { 168 sc->sc_nrange = ofw_pci_nranges(node); 169 if (sc->sc_nrange <= 0) { 170 device_printf(dev, "could not get ranges\n"); 171 return (ENXIO); 172 } 173 sc->sc_range = malloc(sc->sc_nrange * sizeof(sc->sc_range[0]), 174 M_DEVBUF, M_WAITOK); 175 ofw_pci_fill_ranges(node, sc->sc_range); 176 } 177 178 sc->sc_io_rman.rm_type = RMAN_ARRAY; 179 sc->sc_io_rman.rm_descr = "PCI I/O Ports"; 180 error = rman_init(&sc->sc_io_rman); 181 if (error) { 182 device_printf(dev, "rman_init() failed. error = %d\n", error); 183 return (error); 184 } 185 186 sc->sc_mem_rman.rm_type = RMAN_ARRAY; 187 sc->sc_mem_rman.rm_descr = "PCI Memory"; 188 error = rman_init(&sc->sc_mem_rman); 189 if (error) { 190 device_printf(dev, "rman_init() failed. error = %d\n", error); 191 return (error); 192 } 193 194 for (rp = sc->sc_range; rp < sc->sc_range + sc->sc_nrange && 195 rp->pci_hi != 0; rp++) { 196 error = 0; 197 198 switch (rp->pci_hi & OFW_PCI_PHYS_HI_SPACEMASK) { 199 case OFW_PCI_PHYS_HI_SPACE_CONFIG: 200 break; 201 case OFW_PCI_PHYS_HI_SPACE_IO: 202 error = rman_manage_region(&sc->sc_io_rman, rp->pci, 203 rp->pci + rp->size - 1); 204 break; 205 case OFW_PCI_PHYS_HI_SPACE_MEM32: 206 case OFW_PCI_PHYS_HI_SPACE_MEM64: 207 error = rman_manage_region(&sc->sc_mem_rman, rp->pci, 208 rp->pci + rp->size - 1); 209 break; 210 } 211 212 if (error) { 213 device_printf(dev, 214 "rman_manage_region(%x, %#jx, %#jx) failed. " 215 "error = %d\n", rp->pci_hi & 216 OFW_PCI_PHYS_HI_SPACEMASK, rp->pci, 217 rp->pci + rp->size - 1, error); 218 return (error); 219 } 220 } 221 222 ofw_bus_setup_iinfo(node, &sc->sc_pci_iinfo, sizeof(cell_t)); 223 224 return (error); 225 } 226 227 int 228 ofw_pci_attach(device_t dev) 229 { 230 struct ofw_pci_softc *sc; 231 int error; 232 233 sc = device_get_softc(dev); 234 if (!sc->sc_initialized) { 235 error = ofw_pci_init(dev); 236 if (error) 237 return (error); 238 } 239 240 device_add_child(dev, "pci", -1); 241 return (bus_generic_attach(dev)); 242 } 243 244 static int 245 ofw_pci_maxslots(device_t dev) 246 { 247 248 return (PCI_SLOTMAX); 249 } 250 251 static int 252 ofw_pci_route_interrupt(device_t bus, device_t dev, int pin) 253 { 254 struct ofw_pci_softc *sc; 255 struct ofw_pci_register reg; 256 uint32_t pintr, mintr[2]; 257 int intrcells; 258 phandle_t iparent; 259 260 sc = device_get_softc(bus); 261 pintr = pin; 262 263 /* Fabricate imap information in case this isn't an OFW device */ 264 bzero(®, sizeof(reg)); 265 reg.phys_hi = (pci_get_bus(dev) << OFW_PCI_PHYS_HI_BUSSHIFT) | 266 (pci_get_slot(dev) << OFW_PCI_PHYS_HI_DEVICESHIFT) | 267 (pci_get_function(dev) << OFW_PCI_PHYS_HI_FUNCTIONSHIFT); 268 269 intrcells = ofw_bus_lookup_imap(ofw_bus_get_node(dev), 270 &sc->sc_pci_iinfo, ®, sizeof(reg), &pintr, sizeof(pintr), 271 mintr, sizeof(mintr), &iparent); 272 if (intrcells) { 273 pintr = ofw_bus_map_intr(dev, iparent, intrcells, mintr); 274 return (pintr); 275 } 276 277 /* Maybe it's a real interrupt, not an intpin */ 278 if (pin > 4) 279 return (pin); 280 281 device_printf(bus, "could not route pin %d for device %d.%d\n", 282 pin, pci_get_slot(dev), pci_get_function(dev)); 283 return (PCI_INVALID_IRQ); 284 } 285 286 static int 287 ofw_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 288 { 289 struct ofw_pci_softc *sc; 290 291 sc = device_get_softc(dev); 292 293 switch (which) { 294 case PCIB_IVAR_DOMAIN: 295 *result = device_get_unit(dev); 296 return (0); 297 case PCIB_IVAR_BUS: 298 *result = sc->sc_bus; 299 return (0); 300 } 301 302 return (ENOENT); 303 } 304 305 static struct resource * 306 ofw_pci_alloc_resource(device_t bus, device_t child, int type, int *rid, 307 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 308 { 309 struct ofw_pci_softc *sc; 310 struct resource *rv; 311 struct rman *rm; 312 int needactivate; 313 314 needactivate = flags & RF_ACTIVE; 315 flags &= ~RF_ACTIVE; 316 317 sc = device_get_softc(bus); 318 319 switch (type) { 320 case SYS_RES_MEMORY: 321 rm = &sc->sc_mem_rman; 322 break; 323 324 case SYS_RES_IOPORT: 325 rm = &sc->sc_io_rman; 326 break; 327 328 case SYS_RES_IRQ: 329 return (bus_alloc_resource(bus, type, rid, start, end, count, 330 flags)); 331 332 default: 333 device_printf(bus, "unknown resource request from %s\n", 334 device_get_nameunit(child)); 335 return (NULL); 336 } 337 338 rv = rman_reserve_resource(rm, start, end, count, flags, child); 339 if (rv == NULL) { 340 device_printf(bus, "failed to reserve resource for %s\n", 341 device_get_nameunit(child)); 342 return (NULL); 343 } 344 345 rman_set_rid(rv, *rid); 346 347 if (needactivate) { 348 if (bus_activate_resource(child, type, *rid, rv) != 0) { 349 device_printf(bus, 350 "failed to activate resource for %s\n", 351 device_get_nameunit(child)); 352 rman_release_resource(rv); 353 return (NULL); 354 } 355 } 356 357 return (rv); 358 } 359 360 static int 361 ofw_pci_release_resource(device_t bus, device_t child, int type, int rid, 362 struct resource *res) 363 { 364 if (rman_get_flags(res) & RF_ACTIVE) { 365 int error = bus_deactivate_resource(child, type, rid, res); 366 if (error) 367 return error; 368 } 369 370 return (rman_release_resource(res)); 371 } 372 373 static int 374 ofw_pci_activate_resource(device_t bus, device_t child, int type, int rid, 375 struct resource *res) 376 { 377 struct ofw_pci_softc *sc; 378 void *p; 379 380 sc = device_get_softc(bus); 381 382 if (type == SYS_RES_IRQ) { 383 return (bus_activate_resource(bus, type, rid, res)); 384 } 385 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 386 struct ofw_pci_range *rp; 387 vm_paddr_t start; 388 int space; 389 390 start = (vm_paddr_t)rman_get_start(res); 391 392 /* 393 * Map this through the ranges list 394 */ 395 for (rp = sc->sc_range; rp < sc->sc_range + sc->sc_nrange && 396 rp->pci_hi != 0; rp++) { 397 if (start < rp->pci || start >= rp->pci + rp->size) 398 continue; 399 400 switch (rp->pci_hi & OFW_PCI_PHYS_HI_SPACEMASK) { 401 case OFW_PCI_PHYS_HI_SPACE_IO: 402 space = SYS_RES_IOPORT; 403 break; 404 case OFW_PCI_PHYS_HI_SPACE_MEM32: 405 case OFW_PCI_PHYS_HI_SPACE_MEM64: 406 space = SYS_RES_MEMORY; 407 break; 408 default: 409 space = -1; 410 } 411 412 if (type == space) { 413 start += (rp->host - rp->pci); 414 break; 415 } 416 } 417 418 if (bootverbose) 419 printf("ofw_pci mapdev: start %jx, len %jd\n", 420 (rman_res_t)start, rman_get_size(res)); 421 422 p = pmap_mapdev(start, (vm_size_t)rman_get_size(res)); 423 if (p == NULL) 424 return (ENOMEM); 425 426 rman_set_virtual(res, p); 427 rman_set_bustag(res, &bs_le_tag); 428 rman_set_bushandle(res, (u_long)p); 429 } 430 431 return (rman_activate_resource(res)); 432 } 433 434 static int 435 ofw_pci_deactivate_resource(device_t bus, device_t child, int type, int rid, 436 struct resource *res) 437 { 438 /* 439 * If this is a memory resource, unmap it. 440 */ 441 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) { 442 u_int32_t psize; 443 444 psize = rman_get_size(res); 445 pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize); 446 } 447 448 return (rman_deactivate_resource(res)); 449 } 450 451 static int 452 ofw_pci_adjust_resource(device_t bus, device_t child, int type, 453 struct resource *res, rman_res_t start, rman_res_t end) 454 { 455 struct rman *rm = NULL; 456 struct ofw_pci_softc *sc = device_get_softc(bus); 457 458 KASSERT(!(rman_get_flags(res) & RF_ACTIVE), 459 ("active resources cannot be adjusted")); 460 if (rman_get_flags(res) & RF_ACTIVE) 461 return (EINVAL); 462 463 switch (type) { 464 case SYS_RES_MEMORY: 465 rm = &sc->sc_mem_rman; 466 break; 467 case SYS_RES_IOPORT: 468 rm = &sc->sc_io_rman; 469 break; 470 default: 471 return (ENXIO); 472 } 473 474 if (!rman_is_region_manager(res, rm)) 475 return (EINVAL); 476 477 return (rman_adjust_resource(res, start, end)); 478 } 479 480 481 static phandle_t 482 ofw_pci_get_node(device_t bus, device_t dev) 483 { 484 struct ofw_pci_softc *sc; 485 486 sc = device_get_softc(bus); 487 /* We only have one child, the PCI bus, which needs our own node. */ 488 489 return (sc->sc_node); 490 } 491 492 static int 493 ofw_pci_nranges(phandle_t node) 494 { 495 int host_address_cells = 1, pci_address_cells = 3, size_cells = 2; 496 ssize_t nbase_ranges; 497 498 OF_getencprop(OF_parent(node), "#address-cells", &host_address_cells, 499 sizeof(host_address_cells)); 500 OF_getencprop(node, "#address-cells", &pci_address_cells, 501 sizeof(pci_address_cells)); 502 OF_getencprop(node, "#size-cells", &size_cells, sizeof(size_cells)); 503 504 nbase_ranges = OF_getproplen(node, "ranges"); 505 if (nbase_ranges <= 0) 506 return (-1); 507 508 return (nbase_ranges / sizeof(cell_t) / 509 (pci_address_cells + host_address_cells + size_cells)); 510 } 511 512 static int 513 ofw_pci_fill_ranges(phandle_t node, struct ofw_pci_range *ranges) 514 { 515 int host_address_cells = 1, pci_address_cells = 3, size_cells = 2; 516 cell_t *base_ranges; 517 ssize_t nbase_ranges; 518 int nranges; 519 int i, j, k; 520 521 OF_getencprop(OF_parent(node), "#address-cells", &host_address_cells, 522 sizeof(host_address_cells)); 523 OF_getencprop(node, "#address-cells", &pci_address_cells, 524 sizeof(pci_address_cells)); 525 OF_getencprop(node, "#size-cells", &size_cells, sizeof(size_cells)); 526 527 nbase_ranges = OF_getproplen(node, "ranges"); 528 if (nbase_ranges <= 0) 529 return (-1); 530 nranges = nbase_ranges / sizeof(cell_t) / 531 (pci_address_cells + host_address_cells + size_cells); 532 533 base_ranges = malloc(nbase_ranges, M_DEVBUF, M_WAITOK); 534 OF_getencprop(node, "ranges", base_ranges, nbase_ranges); 535 536 for (i = 0, j = 0; i < nranges; i++) { 537 ranges[i].pci_hi = base_ranges[j++]; 538 ranges[i].pci = 0; 539 for (k = 0; k < pci_address_cells - 1; k++) { 540 ranges[i].pci <<= 32; 541 ranges[i].pci |= base_ranges[j++]; 542 } 543 ranges[i].host = 0; 544 for (k = 0; k < host_address_cells; k++) { 545 ranges[i].host <<= 32; 546 ranges[i].host |= base_ranges[j++]; 547 } 548 ranges[i].size = 0; 549 for (k = 0; k < size_cells; k++) { 550 ranges[i].size <<= 32; 551 ranges[i].size |= base_ranges[j++]; 552 } 553 } 554 555 free(base_ranges, M_DEVBUF); 556 return (nranges); 557 } 558
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