Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/mii/mii.c
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1 /* $NetBSD: mii.c,v 1.12 1999/08/03 19:41:49 drochner Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * MII bus layer, glues MII-capable network interface drivers to sharable 38 * PHY drivers. This exports an interface compatible with BSD/OS 3.0's, 39 * plus some NetBSD extensions. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/socket.h> 45 #include <sys/malloc.h> 46 #include <sys/module.h> 47 #include <sys/bus.h> 48 49 #include <net/if.h> 50 #include <net/if_media.h> 51 52 #include <dev/mii/mii.h> 53 #include <dev/mii/miivar.h> 54 55 MODULE_VERSION(miibus, 1); 56 57 #include "miibus_if.h" 58 59 static device_attach_t miibus_attach; 60 static bus_child_location_str_t miibus_child_location_str; 61 static bus_child_pnpinfo_str_t miibus_child_pnpinfo_str; 62 static device_detach_t miibus_detach; 63 static bus_hinted_child_t miibus_hinted_child; 64 static bus_print_child_t miibus_print_child; 65 static device_probe_t miibus_probe; 66 static bus_read_ivar_t miibus_read_ivar; 67 static miibus_readreg_t miibus_readreg; 68 static miibus_statchg_t miibus_statchg; 69 static miibus_writereg_t miibus_writereg; 70 static miibus_linkchg_t miibus_linkchg; 71 static miibus_mediainit_t miibus_mediainit; 72 73 static unsigned char mii_bitreverse(unsigned char x); 74 75 static device_method_t miibus_methods[] = { 76 /* device interface */ 77 DEVMETHOD(device_probe, miibus_probe), 78 DEVMETHOD(device_attach, miibus_attach), 79 DEVMETHOD(device_detach, miibus_detach), 80 DEVMETHOD(device_shutdown, bus_generic_shutdown), 81 82 /* bus interface */ 83 DEVMETHOD(bus_print_child, miibus_print_child), 84 DEVMETHOD(bus_read_ivar, miibus_read_ivar), 85 DEVMETHOD(bus_child_pnpinfo_str, miibus_child_pnpinfo_str), 86 DEVMETHOD(bus_child_location_str, miibus_child_location_str), 87 DEVMETHOD(bus_hinted_child, miibus_hinted_child), 88 89 /* MII interface */ 90 DEVMETHOD(miibus_readreg, miibus_readreg), 91 DEVMETHOD(miibus_writereg, miibus_writereg), 92 DEVMETHOD(miibus_statchg, miibus_statchg), 93 DEVMETHOD(miibus_linkchg, miibus_linkchg), 94 DEVMETHOD(miibus_mediainit, miibus_mediainit), 95 96 DEVMETHOD_END 97 }; 98 99 devclass_t miibus_devclass; 100 101 driver_t miibus_driver = { 102 "miibus", 103 miibus_methods, 104 sizeof(struct mii_data) 105 }; 106 107 struct miibus_ivars { 108 struct ifnet *ifp; 109 ifm_change_cb_t ifmedia_upd; 110 ifm_stat_cb_t ifmedia_sts; 111 u_int mii_flags; 112 u_int mii_offset; 113 }; 114 115 static int 116 miibus_probe(device_t dev) 117 { 118 119 device_set_desc(dev, "MII bus"); 120 121 return (BUS_PROBE_SPECIFIC); 122 } 123 124 static int 125 miibus_attach(device_t dev) 126 { 127 struct miibus_ivars *ivars; 128 struct mii_attach_args *ma; 129 struct mii_data *mii; 130 device_t *children; 131 int i, nchildren; 132 133 mii = device_get_softc(dev); 134 if (device_get_children(dev, &children, &nchildren) == 0) { 135 for (i = 0; i < nchildren; i++) { 136 ma = device_get_ivars(children[i]); 137 ma->mii_data = mii; 138 } 139 free(children, M_TEMP); 140 } 141 if (nchildren == 0) { 142 device_printf(dev, "cannot get children\n"); 143 return (ENXIO); 144 } 145 ivars = device_get_ivars(dev); 146 ifmedia_init(&mii->mii_media, IFM_IMASK, ivars->ifmedia_upd, 147 ivars->ifmedia_sts); 148 mii->mii_ifp = ivars->ifp; 149 mii->mii_ifp->if_capabilities |= IFCAP_LINKSTATE; 150 mii->mii_ifp->if_capenable |= IFCAP_LINKSTATE; 151 LIST_INIT(&mii->mii_phys); 152 153 return (bus_generic_attach(dev)); 154 } 155 156 static int 157 miibus_detach(device_t dev) 158 { 159 struct mii_data *mii; 160 161 bus_generic_detach(dev); 162 mii = device_get_softc(dev); 163 ifmedia_removeall(&mii->mii_media); 164 mii->mii_ifp = NULL; 165 166 return (0); 167 } 168 169 static int 170 miibus_print_child(device_t dev, device_t child) 171 { 172 struct mii_attach_args *ma; 173 int retval; 174 175 ma = device_get_ivars(child); 176 retval = bus_print_child_header(dev, child); 177 retval += printf(" PHY %d", ma->mii_phyno); 178 retval += bus_print_child_footer(dev, child); 179 180 return (retval); 181 } 182 183 static int 184 miibus_read_ivar(device_t dev, device_t child __unused, int which, 185 uintptr_t *result) 186 { 187 struct miibus_ivars *ivars; 188 189 /* 190 * NB: this uses the instance variables of the miibus rather than 191 * its PHY children. 192 */ 193 ivars = device_get_ivars(dev); 194 switch (which) { 195 case MIIBUS_IVAR_FLAGS: 196 *result = ivars->mii_flags; 197 break; 198 default: 199 return (ENOENT); 200 } 201 return (0); 202 } 203 204 static int 205 miibus_child_pnpinfo_str(device_t dev __unused, device_t child, char *buf, 206 size_t buflen) 207 { 208 struct mii_attach_args *ma; 209 210 ma = device_get_ivars(child); 211 snprintf(buf, buflen, "oui=0x%x model=0x%x rev=0x%x", 212 MII_OUI(ma->mii_id1, ma->mii_id2), 213 MII_MODEL(ma->mii_id2), MII_REV(ma->mii_id2)); 214 return (0); 215 } 216 217 static int 218 miibus_child_location_str(device_t dev __unused, device_t child, char *buf, 219 size_t buflen) 220 { 221 struct mii_attach_args *ma; 222 223 ma = device_get_ivars(child); 224 snprintf(buf, buflen, "phyno=%d", ma->mii_phyno); 225 return (0); 226 } 227 228 static void 229 miibus_hinted_child(device_t dev, const char *name, int unit) 230 { 231 struct miibus_ivars *ivars; 232 struct mii_attach_args *args, *ma; 233 device_t *children, phy; 234 int i, nchildren; 235 u_int val; 236 237 if (resource_int_value(name, unit, "phyno", &val) != 0) 238 return; 239 if (device_get_children(dev, &children, &nchildren) != 0) 240 return; 241 ma = NULL; 242 for (i = 0; i < nchildren; i++) { 243 args = device_get_ivars(children[i]); 244 if (args->mii_phyno == val) { 245 ma = args; 246 break; 247 } 248 } 249 free(children, M_TEMP); 250 251 /* 252 * Don't add a PHY that was automatically identified by having media 253 * in its BMSR twice, only allow to alter its attach arguments. 254 */ 255 if (ma == NULL) { 256 ma = malloc(sizeof(struct mii_attach_args), M_DEVBUF, 257 M_NOWAIT); 258 if (ma == NULL) 259 return; 260 phy = device_add_child(dev, name, unit); 261 if (phy == NULL) { 262 free(ma, M_DEVBUF); 263 return; 264 } 265 ivars = device_get_ivars(dev); 266 ma->mii_phyno = val; 267 ma->mii_offset = ivars->mii_offset++; 268 ma->mii_id1 = 0; 269 ma->mii_id2 = 0; 270 ma->mii_capmask = BMSR_DEFCAPMASK; 271 device_set_ivars(phy, ma); 272 } 273 274 if (resource_int_value(name, unit, "id1", &val) == 0) 275 ma->mii_id1 = val; 276 if (resource_int_value(name, unit, "id2", &val) == 0) 277 ma->mii_id2 = val; 278 if (resource_int_value(name, unit, "capmask", &val) == 0) 279 ma->mii_capmask = val; 280 } 281 282 static int 283 miibus_readreg(device_t dev, int phy, int reg) 284 { 285 device_t parent; 286 287 parent = device_get_parent(dev); 288 return (MIIBUS_READREG(parent, phy, reg)); 289 } 290 291 static int 292 miibus_writereg(device_t dev, int phy, int reg, int data) 293 { 294 device_t parent; 295 296 parent = device_get_parent(dev); 297 return (MIIBUS_WRITEREG(parent, phy, reg, data)); 298 } 299 300 static void 301 miibus_statchg(device_t dev) 302 { 303 device_t parent; 304 struct mii_data *mii; 305 306 parent = device_get_parent(dev); 307 MIIBUS_STATCHG(parent); 308 309 mii = device_get_softc(dev); 310 mii->mii_ifp->if_baudrate = ifmedia_baudrate(mii->mii_media_active); 311 } 312 313 static void 314 miibus_linkchg(device_t dev) 315 { 316 struct mii_data *mii; 317 device_t parent; 318 int link_state; 319 320 parent = device_get_parent(dev); 321 MIIBUS_LINKCHG(parent); 322 323 mii = device_get_softc(dev); 324 325 if (mii->mii_media_status & IFM_AVALID) { 326 if (mii->mii_media_status & IFM_ACTIVE) 327 link_state = LINK_STATE_UP; 328 else 329 link_state = LINK_STATE_DOWN; 330 } else 331 link_state = LINK_STATE_UNKNOWN; 332 if_link_state_change(mii->mii_ifp, link_state); 333 } 334 335 static void 336 miibus_mediainit(device_t dev) 337 { 338 struct mii_data *mii; 339 struct ifmedia_entry *m; 340 int media = 0; 341 342 /* Poke the parent in case it has any media of its own to add. */ 343 MIIBUS_MEDIAINIT(device_get_parent(dev)); 344 345 mii = device_get_softc(dev); 346 LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) { 347 media = m->ifm_media; 348 if (media == (IFM_ETHER | IFM_AUTO)) 349 break; 350 } 351 352 ifmedia_set(&mii->mii_media, media); 353 } 354 355 /* 356 * Helper function used by network interface drivers, attaches the miibus and 357 * the PHYs to the network interface driver parent. 358 */ 359 int 360 mii_attach(device_t dev, device_t *miibus, struct ifnet *ifp, 361 ifm_change_cb_t ifmedia_upd, ifm_stat_cb_t ifmedia_sts, int capmask, 362 int phyloc, int offloc, int flags) 363 { 364 struct miibus_ivars *ivars; 365 struct mii_attach_args *args, ma; 366 device_t *children, phy; 367 int bmsr, first, i, nchildren, phymax, phymin, rv; 368 uint32_t phymask; 369 370 if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) { 371 printf("%s: phyloc and offloc specified\n", __func__); 372 return (EINVAL); 373 } 374 375 if (offloc != MII_OFFSET_ANY && (offloc < 0 || offloc >= MII_NPHY)) { 376 printf("%s: invalid offloc %d\n", __func__, offloc); 377 return (EINVAL); 378 } 379 380 if (phyloc == MII_PHY_ANY) { 381 phymin = 0; 382 phymax = MII_NPHY - 1; 383 } else { 384 if (phyloc < 0 || phyloc >= MII_NPHY) { 385 printf("%s: invalid phyloc %d\n", __func__, phyloc); 386 return (EINVAL); 387 } 388 phymin = phymax = phyloc; 389 } 390 391 first = 0; 392 if (*miibus == NULL) { 393 first = 1; 394 ivars = malloc(sizeof(*ivars), M_DEVBUF, M_NOWAIT); 395 if (ivars == NULL) 396 return (ENOMEM); 397 ivars->ifp = ifp; 398 ivars->ifmedia_upd = ifmedia_upd; 399 ivars->ifmedia_sts = ifmedia_sts; 400 ivars->mii_flags = flags; 401 *miibus = device_add_child(dev, "miibus", -1); 402 if (*miibus == NULL) { 403 rv = ENXIO; 404 goto fail; 405 } 406 device_set_ivars(*miibus, ivars); 407 } else { 408 ivars = device_get_ivars(*miibus); 409 if (ivars->ifp != ifp || ivars->ifmedia_upd != ifmedia_upd || 410 ivars->ifmedia_sts != ifmedia_sts || 411 ivars->mii_flags != flags) { 412 printf("%s: non-matching invariant\n", __func__); 413 return (EINVAL); 414 } 415 /* 416 * Assignment of the attach arguments mii_data for the first 417 * pass is done in miibus_attach(), i.e. once the miibus softc 418 * has been allocated. 419 */ 420 ma.mii_data = device_get_softc(*miibus); 421 } 422 423 ma.mii_capmask = capmask; 424 425 if (resource_int_value(device_get_name(*miibus), 426 device_get_unit(*miibus), "phymask", &phymask) != 0) 427 phymask = 0xffffffff; 428 429 if (device_get_children(*miibus, &children, &nchildren) != 0) { 430 children = NULL; 431 nchildren = 0; 432 } 433 ivars->mii_offset = 0; 434 for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) { 435 /* 436 * Make sure we haven't already configured a PHY at this 437 * address. This allows mii_attach() to be called 438 * multiple times. 439 */ 440 for (i = 0; i < nchildren; i++) { 441 args = device_get_ivars(children[i]); 442 if (args->mii_phyno == ma.mii_phyno) { 443 /* 444 * Yes, there is already something 445 * configured at this address. 446 */ 447 goto skip; 448 } 449 } 450 451 /* 452 * Check to see if there is a PHY at this address. Note, 453 * many braindead PHYs report 0/0 in their ID registers, 454 * so we test for media in the BMSR. 455 */ 456 bmsr = MIIBUS_READREG(dev, ma.mii_phyno, MII_BMSR); 457 if (bmsr == 0 || bmsr == 0xffff || 458 (bmsr & (BMSR_EXTSTAT | BMSR_MEDIAMASK)) == 0) { 459 /* Assume no PHY at this address. */ 460 continue; 461 } 462 463 /* 464 * There is a PHY at this address. If we were given an 465 * `offset' locator, skip this PHY if it doesn't match. 466 */ 467 if (offloc != MII_OFFSET_ANY && offloc != ivars->mii_offset) 468 goto skip; 469 470 /* 471 * Skip this PHY if it's not included in the phymask hint. 472 */ 473 if ((phymask & (1 << ma.mii_phyno)) == 0) 474 goto skip; 475 476 /* 477 * Extract the IDs. Braindead PHYs will be handled by 478 * the `ukphy' driver, as we have no ID information to 479 * match on. 480 */ 481 ma.mii_id1 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR1); 482 ma.mii_id2 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR2); 483 484 ma.mii_offset = ivars->mii_offset; 485 args = malloc(sizeof(struct mii_attach_args), M_DEVBUF, 486 M_NOWAIT); 487 if (args == NULL) 488 goto skip; 489 bcopy((char *)&ma, (char *)args, sizeof(ma)); 490 phy = device_add_child(*miibus, NULL, -1); 491 if (phy == NULL) { 492 free(args, M_DEVBUF); 493 goto skip; 494 } 495 device_set_ivars(phy, args); 496 skip: 497 ivars->mii_offset++; 498 } 499 free(children, M_TEMP); 500 501 if (first != 0) { 502 rv = device_set_driver(*miibus, &miibus_driver); 503 if (rv != 0) 504 goto fail; 505 bus_enumerate_hinted_children(*miibus); 506 rv = device_get_children(*miibus, &children, &nchildren); 507 if (rv != 0) 508 goto fail; 509 free(children, M_TEMP); 510 if (nchildren == 0) { 511 rv = ENXIO; 512 goto fail; 513 } 514 rv = bus_generic_attach(dev); 515 if (rv != 0) 516 goto fail; 517 518 /* Attaching of the PHY drivers is done in miibus_attach(). */ 519 return (0); 520 } 521 rv = bus_generic_attach(*miibus); 522 if (rv != 0) 523 goto fail; 524 525 return (0); 526 527 fail: 528 if (*miibus != NULL) 529 device_delete_child(dev, *miibus); 530 free(ivars, M_DEVBUF); 531 if (first != 0) 532 *miibus = NULL; 533 return (rv); 534 } 535 536 /* 537 * Media changed; notify all PHYs. 538 */ 539 int 540 mii_mediachg(struct mii_data *mii) 541 { 542 struct mii_softc *child; 543 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 544 int rv; 545 546 mii->mii_media_status = 0; 547 mii->mii_media_active = IFM_NONE; 548 549 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 550 /* 551 * If the media indicates a different PHY instance, 552 * isolate this one. 553 */ 554 if (IFM_INST(ife->ifm_media) != child->mii_inst) { 555 if ((child->mii_flags & MIIF_NOISOLATE) != 0) { 556 device_printf(child->mii_dev, "%s: " 557 "can't handle non-zero PHY instance %d\n", 558 __func__, child->mii_inst); 559 continue; 560 } 561 PHY_WRITE(child, MII_BMCR, PHY_READ(child, MII_BMCR) | 562 BMCR_ISO); 563 continue; 564 } 565 rv = PHY_SERVICE(child, mii, MII_MEDIACHG); 566 if (rv) 567 return (rv); 568 } 569 return (0); 570 } 571 572 /* 573 * Call the PHY tick routines, used during autonegotiation. 574 */ 575 void 576 mii_tick(struct mii_data *mii) 577 { 578 struct mii_softc *child; 579 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 580 581 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 582 /* 583 * If this PHY instance isn't currently selected, just skip 584 * it. 585 */ 586 if (IFM_INST(ife->ifm_media) != child->mii_inst) 587 continue; 588 (void)PHY_SERVICE(child, mii, MII_TICK); 589 } 590 } 591 592 /* 593 * Get media status from PHYs. 594 */ 595 void 596 mii_pollstat(struct mii_data *mii) 597 { 598 struct mii_softc *child; 599 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 600 601 mii->mii_media_status = 0; 602 mii->mii_media_active = IFM_NONE; 603 604 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 605 /* 606 * If we're not polling this PHY instance, just skip it. 607 */ 608 if (IFM_INST(ife->ifm_media) != child->mii_inst) 609 continue; 610 (void)PHY_SERVICE(child, mii, MII_POLLSTAT); 611 } 612 } 613 614 /* 615 * Inform the PHYs that the interface is down. 616 */ 617 void 618 mii_down(struct mii_data *mii) 619 { 620 struct mii_softc *child; 621 622 LIST_FOREACH(child, &mii->mii_phys, mii_list) 623 mii_phy_down(child); 624 } 625 626 static unsigned char 627 mii_bitreverse(unsigned char x) 628 { 629 static unsigned const char nibbletab[16] = { 630 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 631 }; 632 633 return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]); 634 } 635 636 u_int 637 mii_oui(u_int id1, u_int id2) 638 { 639 u_int h; 640 641 h = (id1 << 6) | (id2 >> 10); 642 643 return ((mii_bitreverse(h >> 16) << 16) | 644 (mii_bitreverse((h >> 8) & 0xff) << 8) | 645 mii_bitreverse(h & 0xff)); 646 }
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