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: releng/8.2/sys/dev/mii/mii.c 215886 2010-11-26 20:57:45Z marius $"); 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 #include <net/route.h> 52 53 #include <dev/mii/mii.h> 54 #include <dev/mii/miivar.h> 55 56 MODULE_VERSION(miibus, 1); 57 58 #include "miibus_if.h" 59 60 static int miibus_print_child(device_t dev, device_t child); 61 static int miibus_read_ivar(device_t dev, device_t child, int which, 62 uintptr_t *result); 63 static int miibus_child_location_str(device_t bus, device_t child, char *buf, 64 size_t buflen); 65 static int miibus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 66 size_t buflen); 67 static int miibus_readreg(device_t, int, int); 68 static int miibus_writereg(device_t, int, int, int); 69 static void miibus_statchg(device_t); 70 static void miibus_linkchg(device_t); 71 static void miibus_mediainit(device_t); 72 73 static device_method_t miibus_methods[] = { 74 /* device interface */ 75 DEVMETHOD(device_probe, miibus_probe), 76 DEVMETHOD(device_attach, miibus_attach), 77 DEVMETHOD(device_detach, miibus_detach), 78 DEVMETHOD(device_shutdown, bus_generic_shutdown), 79 80 /* bus interface */ 81 DEVMETHOD(bus_print_child, miibus_print_child), 82 DEVMETHOD(bus_read_ivar, miibus_read_ivar), 83 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 84 DEVMETHOD(bus_child_pnpinfo_str, miibus_child_pnpinfo_str), 85 DEVMETHOD(bus_child_location_str, miibus_child_location_str), 86 87 /* MII interface */ 88 DEVMETHOD(miibus_readreg, miibus_readreg), 89 DEVMETHOD(miibus_writereg, miibus_writereg), 90 DEVMETHOD(miibus_statchg, miibus_statchg), 91 DEVMETHOD(miibus_linkchg, miibus_linkchg), 92 DEVMETHOD(miibus_mediainit, miibus_mediainit), 93 94 { 0, 0 } 95 }; 96 97 devclass_t miibus_devclass; 98 99 driver_t miibus_driver = { 100 "miibus", 101 miibus_methods, 102 sizeof(struct mii_data) 103 }; 104 105 struct miibus_ivars { 106 struct ifnet *ifp; 107 ifm_change_cb_t ifmedia_upd; 108 ifm_stat_cb_t ifmedia_sts; 109 int mii_flags; 110 }; 111 112 int 113 miibus_probe(device_t dev) 114 { 115 116 device_set_desc(dev, "MII bus"); 117 118 return (BUS_PROBE_SPECIFIC); 119 } 120 121 int 122 miibus_attach(device_t dev) 123 { 124 struct miibus_ivars *ivars; 125 struct mii_attach_args *ma; 126 struct mii_data *mii; 127 device_t *children; 128 int i, nchildren; 129 130 mii = device_get_softc(dev); 131 nchildren = 0; 132 if (device_get_children(dev, &children, &nchildren) == 0) { 133 for (i = 0; i < nchildren; i++) { 134 ma = device_get_ivars(children[i]); 135 ma->mii_data = mii; 136 } 137 free(children, M_TEMP); 138 } 139 if (nchildren == 0) { 140 device_printf(dev, "cannot get children\n"); 141 return (ENXIO); 142 } 143 ivars = device_get_ivars(dev); 144 ifmedia_init(&mii->mii_media, IFM_IMASK, ivars->ifmedia_upd, 145 ivars->ifmedia_sts); 146 mii->mii_ifp = ivars->ifp; 147 mii->mii_ifp->if_capabilities |= IFCAP_LINKSTATE; 148 mii->mii_ifp->if_capenable |= IFCAP_LINKSTATE; 149 LIST_INIT(&mii->mii_phys); 150 151 return (bus_generic_attach(dev)); 152 } 153 154 int 155 miibus_detach(device_t dev) 156 { 157 struct mii_data *mii; 158 159 bus_generic_detach(dev); 160 mii = device_get_softc(dev); 161 ifmedia_removeall(&mii->mii_media); 162 mii->mii_ifp = NULL; 163 164 return (0); 165 } 166 167 static int 168 miibus_print_child(device_t dev, device_t child) 169 { 170 struct mii_attach_args *ma; 171 int retval; 172 173 ma = device_get_ivars(child); 174 retval = bus_print_child_header(dev, child); 175 retval += printf(" PHY %d", ma->mii_phyno); 176 retval += bus_print_child_footer(dev, child); 177 178 return (retval); 179 } 180 181 static int 182 miibus_read_ivar(device_t dev, device_t child __unused, int which, 183 uintptr_t *result) 184 { 185 struct miibus_ivars *ivars; 186 187 /* 188 * NB: this uses the instance variables of the miibus rather than 189 * its PHY children. 190 */ 191 ivars = device_get_ivars(dev); 192 switch (which) { 193 case MIIBUS_IVAR_FLAGS: 194 *result = ivars->mii_flags; 195 break; 196 default: 197 return (ENOENT); 198 } 199 return (0); 200 } 201 202 static int 203 miibus_child_pnpinfo_str(device_t bus __unused, device_t child, char *buf, 204 size_t buflen) 205 { 206 struct mii_attach_args *ma; 207 208 ma = device_get_ivars(child); 209 snprintf(buf, buflen, "oui=0x%x model=0x%x rev=0x%x", 210 MII_OUI(ma->mii_id1, ma->mii_id2), 211 MII_MODEL(ma->mii_id2), MII_REV(ma->mii_id2)); 212 return (0); 213 } 214 215 static int 216 miibus_child_location_str(device_t bus __unused, device_t child, char *buf, 217 size_t buflen) 218 { 219 struct mii_attach_args *ma; 220 221 ma = device_get_ivars(child); 222 snprintf(buf, buflen, "phyno=%d", ma->mii_phyno); 223 return (0); 224 } 225 226 static int 227 miibus_readreg(device_t dev, int phy, int reg) 228 { 229 device_t parent; 230 231 parent = device_get_parent(dev); 232 return (MIIBUS_READREG(parent, phy, reg)); 233 } 234 235 static int 236 miibus_writereg(device_t dev, int phy, int reg, int data) 237 { 238 device_t parent; 239 240 parent = device_get_parent(dev); 241 return (MIIBUS_WRITEREG(parent, phy, reg, data)); 242 } 243 244 static void 245 miibus_statchg(device_t dev) 246 { 247 device_t parent; 248 struct mii_data *mii; 249 struct ifnet *ifp; 250 251 parent = device_get_parent(dev); 252 MIIBUS_STATCHG(parent); 253 254 mii = device_get_softc(dev); 255 256 /* 257 * Note that each NIC's softc must start with an ifnet pointer. 258 * XXX: EVIL HACK! 259 */ 260 ifp = *(struct ifnet **)device_get_softc(parent); 261 ifp->if_baudrate = ifmedia_baudrate(mii->mii_media_active); 262 } 263 264 static void 265 miibus_linkchg(device_t dev) 266 { 267 struct mii_data *mii; 268 device_t parent; 269 int link_state; 270 271 parent = device_get_parent(dev); 272 MIIBUS_LINKCHG(parent); 273 274 mii = device_get_softc(dev); 275 276 if (mii->mii_media_status & IFM_AVALID) { 277 if (mii->mii_media_status & IFM_ACTIVE) 278 link_state = LINK_STATE_UP; 279 else 280 link_state = LINK_STATE_DOWN; 281 } else 282 link_state = LINK_STATE_UNKNOWN; 283 /* 284 * Note that each NIC's softc must start with an ifnet pointer. 285 * XXX: EVIL HACK! 286 */ 287 if_link_state_change(*(struct ifnet**)device_get_softc(parent), link_state); 288 } 289 290 static void 291 miibus_mediainit(device_t dev) 292 { 293 struct mii_data *mii; 294 struct ifmedia_entry *m; 295 int media = 0; 296 297 /* Poke the parent in case it has any media of its own to add. */ 298 MIIBUS_MEDIAINIT(device_get_parent(dev)); 299 300 mii = device_get_softc(dev); 301 LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) { 302 media = m->ifm_media; 303 if (media == (IFM_ETHER | IFM_AUTO)) 304 break; 305 } 306 307 ifmedia_set(&mii->mii_media, media); 308 } 309 310 /* 311 * Helper function used by network interface drivers, attaches the miibus and 312 * the PHYs to the network interface driver parent. 313 */ 314 int 315 mii_attach(device_t dev, device_t *miibus, struct ifnet *ifp, 316 ifm_change_cb_t ifmedia_upd, ifm_stat_cb_t ifmedia_sts, int capmask, 317 int phyloc, int offloc, int flags) 318 { 319 struct miibus_ivars *ivars; 320 struct mii_attach_args ma, *args; 321 device_t *children, phy; 322 int bmsr, first, i, nchildren, offset, phymax, phymin, rv; 323 324 if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) { 325 printf("%s: phyloc and offloc specified\n", __func__); 326 return (EINVAL); 327 } 328 329 if (offloc != MII_OFFSET_ANY && (offloc < 0 || offloc >= MII_NPHY)) { 330 printf("%s: ivalid offloc %d\n", __func__, offloc); 331 return (EINVAL); 332 } 333 334 if (phyloc == MII_PHY_ANY) { 335 phymin = 0; 336 phymax = MII_NPHY - 1; 337 } else { 338 if (phyloc < 0 || phyloc >= MII_NPHY) { 339 printf("%s: ivalid phyloc %d\n", __func__, phyloc); 340 return (EINVAL); 341 } 342 phymin = phymax = phyloc; 343 } 344 345 first = 0; 346 if (*miibus == NULL) { 347 first = 1; 348 ivars = malloc(sizeof(*ivars), M_DEVBUF, M_NOWAIT); 349 if (ivars == NULL) 350 return (ENOMEM); 351 ivars->ifp = ifp; 352 ivars->ifmedia_upd = ifmedia_upd; 353 ivars->ifmedia_sts = ifmedia_sts; 354 ivars->mii_flags = flags; 355 *miibus = device_add_child(dev, "miibus", -1); 356 if (*miibus == NULL) { 357 rv = ENXIO; 358 goto fail; 359 } 360 device_set_ivars(*miibus, ivars); 361 } else { 362 ivars = device_get_ivars(*miibus); 363 if (ivars->ifp != ifp || ivars->ifmedia_upd != ifmedia_upd || 364 ivars->ifmedia_sts != ifmedia_sts || 365 ivars->mii_flags != flags) { 366 printf("%s: non-matching invariant\n", __func__); 367 return (EINVAL); 368 } 369 /* 370 * Assignment of the attach arguments mii_data for the first 371 * pass is done in miibus_attach(), i.e. once the miibus softc 372 * has been allocated. 373 */ 374 ma.mii_data = device_get_softc(*miibus); 375 } 376 377 ma.mii_capmask = capmask; 378 379 phy = NULL; 380 offset = 0; 381 for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) { 382 /* 383 * Make sure we haven't already configured a PHY at this 384 * address. This allows mii_attach() to be called 385 * multiple times. 386 */ 387 if (device_get_children(*miibus, &children, &nchildren) == 0) { 388 for (i = 0; i < nchildren; i++) { 389 args = device_get_ivars(children[i]); 390 if (args->mii_phyno == ma.mii_phyno) { 391 /* 392 * Yes, there is already something 393 * configured at this address. 394 */ 395 free(children, M_TEMP); 396 goto skip; 397 } 398 } 399 free(children, M_TEMP); 400 } 401 402 /* 403 * Check to see if there is a PHY at this address. Note, 404 * many braindead PHYs report 0/0 in their ID registers, 405 * so we test for media in the BMSR. 406 */ 407 bmsr = MIIBUS_READREG(dev, ma.mii_phyno, MII_BMSR); 408 if (bmsr == 0 || bmsr == 0xffff || 409 (bmsr & (BMSR_EXTSTAT | BMSR_MEDIAMASK)) == 0) { 410 /* Assume no PHY at this address. */ 411 continue; 412 } 413 414 /* 415 * There is a PHY at this address. If we were given an 416 * `offset' locator, skip this PHY if it doesn't match. 417 */ 418 if (offloc != MII_OFFSET_ANY && offloc != offset) 419 goto skip; 420 421 /* 422 * Extract the IDs. Braindead PHYs will be handled by 423 * the `ukphy' driver, as we have no ID information to 424 * match on. 425 */ 426 ma.mii_id1 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR1); 427 ma.mii_id2 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR2); 428 429 args = malloc(sizeof(struct mii_attach_args), M_DEVBUF, 430 M_NOWAIT); 431 if (args == NULL) 432 goto skip; 433 bcopy((char *)&ma, (char *)args, sizeof(ma)); 434 phy = device_add_child(*miibus, NULL, -1); 435 if (phy == NULL) { 436 free(args, M_DEVBUF); 437 goto skip; 438 } 439 device_set_ivars(phy, args); 440 skip: 441 offset++; 442 } 443 444 if (first != 0) { 445 if (phy == NULL) { 446 rv = ENXIO; 447 goto fail; 448 } 449 rv = bus_generic_attach(dev); 450 if (rv != 0) 451 goto fail; 452 453 /* Attaching of the PHY drivers is done in miibus_attach(). */ 454 return (0); 455 } 456 rv = bus_generic_attach(*miibus); 457 if (rv != 0) 458 goto fail; 459 460 return (0); 461 462 fail: 463 if (*miibus != NULL) 464 device_delete_child(dev, *miibus); 465 free(ivars, M_DEVBUF); 466 if (first != 0) 467 *miibus = NULL; 468 return (rv); 469 } 470 471 int 472 mii_phy_probe(device_t dev, device_t *child, ifm_change_cb_t ifmedia_upd, 473 ifm_stat_cb_t ifmedia_sts) 474 { 475 struct ifnet *ifp; 476 477 /* 478 * Note that each NIC's softc must start with an ifnet pointer. 479 * XXX: EVIL HACK! 480 */ 481 ifp = *(struct ifnet **)device_get_softc(dev); 482 return (mii_attach(dev, child, ifp, ifmedia_upd, ifmedia_sts, 483 BMSR_DEFCAPMASK, MII_PHY_ANY, MII_OFFSET_ANY, 0)); 484 } 485 486 /* 487 * Media changed; notify all PHYs. 488 */ 489 int 490 mii_mediachg(struct mii_data *mii) 491 { 492 struct mii_softc *child; 493 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 494 int rv; 495 496 mii->mii_media_status = 0; 497 mii->mii_media_active = IFM_NONE; 498 499 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 500 /* 501 * If the media indicates a different PHY instance, 502 * isolate this one. 503 */ 504 if (IFM_INST(ife->ifm_media) != child->mii_inst) { 505 if ((child->mii_flags & MIIF_NOISOLATE) != 0) { 506 device_printf(child->mii_dev, "%s: " 507 "can't handle non-zero PHY instance %d\n", 508 __func__, child->mii_inst); 509 continue; 510 } 511 PHY_WRITE(child, MII_BMCR, PHY_READ(child, MII_BMCR) | 512 BMCR_ISO); 513 continue; 514 } 515 rv = (*child->mii_service)(child, mii, MII_MEDIACHG); 516 if (rv) 517 return (rv); 518 } 519 return (0); 520 } 521 522 /* 523 * Call the PHY tick routines, used during autonegotiation. 524 */ 525 void 526 mii_tick(struct mii_data *mii) 527 { 528 struct mii_softc *child; 529 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 530 531 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 532 /* 533 * If this PHY instance isn't currently selected, just skip 534 * it. 535 */ 536 if (IFM_INST(ife->ifm_media) != child->mii_inst) 537 continue; 538 (void)(*child->mii_service)(child, mii, MII_TICK); 539 } 540 } 541 542 /* 543 * Get media status from PHYs. 544 */ 545 void 546 mii_pollstat(struct mii_data *mii) 547 { 548 struct mii_softc *child; 549 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 550 551 mii->mii_media_status = 0; 552 mii->mii_media_active = IFM_NONE; 553 554 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 555 /* 556 * If we're not polling this PHY instance, just skip it. 557 */ 558 if (IFM_INST(ife->ifm_media) != child->mii_inst) 559 continue; 560 (void)(*child->mii_service)(child, mii, MII_POLLSTAT); 561 } 562 } 563 564 /* 565 * Inform the PHYs that the interface is down. 566 */ 567 void 568 mii_down(struct mii_data *mii) 569 { 570 struct mii_softc *child; 571 572 LIST_FOREACH(child, &mii->mii_phys, mii_list) 573 mii_phy_down(child); 574 }
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