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/mlphy.c
Version:
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1 /*- 2 * Copyright (c) 1997, 1998, 1999 3 * Bill Paul <wpaul@ctr.columbia.edu>. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD 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 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/6.0/sys/dev/mii/mlphy.c 139749 2005-01-06 01:43:34Z imp $"); 36 37 /* 38 * driver for Micro Linear 6692 PHYs 39 * 40 * The Micro Linear 6692 is a strange beast, and dealing with it using 41 * this code framework is tricky. The 6692 is actually a 100Mbps-only 42 * device, which means that a second PHY is required to support 10Mbps 43 * modes. However, even though the 6692 does not support 10Mbps modes, 44 * it can still advertise them when performing autonegotiation. If a 45 * 10Mbps mode is negotiated, we must program the registers of the 46 * companion PHY accordingly in addition to programming the registers 47 * of the 6692. 48 * 49 * This device also does not have vendor/device ID registers. 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/socket.h> 56 #include <sys/module.h> 57 #include <sys/bus.h> 58 #include <sys/malloc.h> 59 60 #include <net/if.h> 61 #include <net/if_media.h> 62 63 #include <dev/mii/mii.h> 64 #include <dev/mii/miivar.h> 65 66 #include "miibus_if.h" 67 68 #define ML_STATE_AUTO_SELF 1 69 #define ML_STATE_AUTO_OTHER 2 70 71 struct mlphy_softc { 72 struct mii_softc ml_mii; 73 int ml_state; 74 int ml_linked; 75 }; 76 77 static int mlphy_probe(device_t); 78 static int mlphy_attach(device_t); 79 80 static device_method_t mlphy_methods[] = { 81 /* device interface */ 82 DEVMETHOD(device_probe, mlphy_probe), 83 DEVMETHOD(device_attach, mlphy_attach), 84 DEVMETHOD(device_detach, mii_phy_detach), 85 DEVMETHOD(device_shutdown, bus_generic_shutdown), 86 { 0, 0 } 87 }; 88 89 static devclass_t mlphy_devclass; 90 91 static driver_t mlphy_driver = { 92 "mlphy", 93 mlphy_methods, 94 sizeof(struct mlphy_softc) 95 }; 96 97 DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, 0, 0); 98 99 static int mlphy_service(struct mii_softc *, struct mii_data *, int); 100 static void mlphy_reset(struct mii_softc *); 101 static void mlphy_status(struct mii_softc *); 102 103 static int 104 mlphy_probe(dev) 105 device_t dev; 106 { 107 struct mii_attach_args *ma; 108 device_t parent; 109 110 ma = device_get_ivars(dev); 111 parent = device_get_parent(device_get_parent(dev)); 112 113 /* 114 * Micro Linear PHY reports oui == 0 model == 0 115 */ 116 if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 || 117 MII_MODEL(ma->mii_id2) != 0) 118 return (ENXIO); 119 120 /* 121 * Make sure the parent is a `tl'. So far, I have only 122 * encountered the 6692 on an Olicom card with a ThunderLAN 123 * controller chip. 124 */ 125 if (strcmp(device_get_name(parent), "tl") != 0) 126 return (ENXIO); 127 128 device_set_desc(dev, "Micro Linear 6692 media interface"); 129 130 return (0); 131 } 132 133 static int 134 mlphy_attach(dev) 135 device_t dev; 136 { 137 struct mlphy_softc *msc; 138 struct mii_softc *sc; 139 struct mii_attach_args *ma; 140 struct mii_data *mii; 141 142 msc = device_get_softc(dev); 143 sc = &msc->ml_mii; 144 ma = device_get_ivars(dev); 145 sc->mii_dev = device_get_parent(dev); 146 mii = device_get_softc(sc->mii_dev); 147 LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list); 148 149 sc->mii_inst = mii->mii_instance; 150 sc->mii_phy = ma->mii_phyno; 151 sc->mii_service = mlphy_service; 152 sc->mii_pdata = mii; 153 154 mii->mii_instance++; 155 156 #define ADD(m, c) ifmedia_add(&mii->mii_media, (m), (c), NULL) 157 158 #if 0 /* See above. */ 159 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst), 160 BMCR_ISO); 161 #endif 162 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst), 163 BMCR_LOOP|BMCR_S100); 164 165 sc->mii_flags &= ~MIIF_NOISOLATE; 166 mii_phy_reset(sc); 167 sc->mii_flags |= MIIF_NOISOLATE; 168 169 sc->mii_capabilities = 170 PHY_READ(sc, MII_BMSR) & ma->mii_capmask; 171 ma->mii_capmask = ~sc->mii_capabilities; 172 device_printf(dev, " "); 173 mii_add_media(sc); 174 printf("\n"); 175 #undef ADD 176 MIIBUS_MEDIAINIT(sc->mii_dev); 177 return(0); 178 } 179 180 static int 181 mlphy_service(xsc, mii, cmd) 182 struct mii_softc *xsc; 183 struct mii_data *mii; 184 int cmd; 185 { 186 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 187 int reg; 188 struct mii_softc *other = NULL; 189 struct mlphy_softc *msc = (struct mlphy_softc *)xsc; 190 struct mii_softc *sc = (struct mii_softc *)&msc->ml_mii; 191 device_t *devlist; 192 int devs, i; 193 194 /* 195 * See if there's another PHY on this bus with us. 196 * If so, we may need it for 10Mbps modes. 197 */ 198 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 199 for (i = 0; i < devs; i++) { 200 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 201 other = device_get_softc(devlist[i]); 202 break; 203 } 204 } 205 free(devlist, M_TEMP); 206 207 switch (cmd) { 208 case MII_POLLSTAT: 209 /* 210 * If we're not polling our PHY instance, just return. 211 */ 212 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 213 return (0); 214 break; 215 216 case MII_MEDIACHG: 217 /* 218 * If the media indicates a different PHY instance, 219 * isolate ourselves. 220 */ 221 if (IFM_INST(ife->ifm_media) != sc->mii_inst) { 222 reg = PHY_READ(sc, MII_BMCR); 223 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO); 224 return (0); 225 } 226 227 /* 228 * If the interface is not up, don't do anything. 229 */ 230 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 231 break; 232 233 switch (IFM_SUBTYPE(ife->ifm_media)) { 234 case IFM_AUTO: 235 /* 236 * For autonegotiation, reset and isolate the 237 * companion PHY (if any) and then do NWAY 238 * autonegotiation ourselves. 239 */ 240 msc->ml_state = ML_STATE_AUTO_SELF; 241 if (other != NULL) { 242 mii_phy_reset(other); 243 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 244 } 245 (void) mii_phy_auto(sc); 246 msc->ml_linked = 0; 247 return(0); 248 case IFM_10_T: 249 /* 250 * For 10baseT modes, reset and program the 251 * companion PHY (of any), then program ourselves 252 * to match. This will put us in pass-through 253 * mode and let the companion PHY do all the 254 * work. 255 * 256 * BMCR data is stored in the ifmedia entry. 257 */ 258 if (other != NULL) { 259 mii_phy_reset(other); 260 PHY_WRITE(other, MII_BMCR, ife->ifm_data); 261 } 262 PHY_WRITE(sc, MII_ANAR, mii_anar(ife->ifm_media)); 263 PHY_WRITE(sc, MII_BMCR, ife->ifm_data); 264 msc->ml_state = 0; 265 break; 266 case IFM_100_TX: 267 /* 268 * For 100baseTX modes, reset and isolate the 269 * companion PHY (if any), then program ourselves 270 * accordingly. 271 * 272 * BMCR data is stored in the ifmedia entry. 273 */ 274 if (other != NULL) { 275 mii_phy_reset(other); 276 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 277 } 278 PHY_WRITE(sc, MII_ANAR, mii_anar(ife->ifm_media)); 279 PHY_WRITE(sc, MII_BMCR, ife->ifm_data); 280 msc->ml_state = 0; 281 break; 282 case IFM_100_T4: 283 /* 284 * XXX Not supported as a manual setting right now. 285 */ 286 return (EINVAL); 287 default: 288 break; 289 290 } 291 break; 292 293 case MII_TICK: 294 /* 295 * If we're not currently selected, just return. 296 */ 297 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 298 return (0); 299 300 /* 301 * Is the interface even up? 302 */ 303 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 304 return (0); 305 306 /* 307 * Only used for autonegotiation. 308 */ 309 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) 310 break; 311 312 /* 313 * Check to see if we have link. If we do, we don't 314 * need to restart the autonegotiation process. Read 315 * the BMSR twice in case it's latched. 316 * If we're in a 10Mbps mode, check the link of the 317 * 10Mbps PHY. Sometimes the Micro Linear PHY's 318 * linkstat bit will clear while the linkstat bit of 319 * the companion PHY will remain set. 320 */ 321 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 322 reg = PHY_READ(other, MII_BMSR) | 323 PHY_READ(other, MII_BMSR); 324 } else { 325 reg = PHY_READ(sc, MII_BMSR) | 326 PHY_READ(sc, MII_BMSR); 327 } 328 329 if (reg & BMSR_LINK) { 330 if (!msc->ml_linked) { 331 msc->ml_linked = 1; 332 mlphy_status(sc); 333 } 334 break; 335 } 336 337 /* 338 * Only retry autonegotiation every 5 seconds. 339 */ 340 if (++sc->mii_ticks <= 5) 341 break; 342 343 sc->mii_ticks = 0; 344 msc->ml_linked = 0; 345 mii->mii_media_active = IFM_NONE; 346 mii_phy_reset(sc); 347 msc->ml_state = ML_STATE_AUTO_SELF; 348 if (other != NULL) { 349 mii_phy_reset(other); 350 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 351 } 352 mii_phy_auto(sc); 353 return(0); 354 } 355 356 /* Update the media status. */ 357 358 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 359 int other_inst; 360 other_inst = other->mii_inst; 361 other->mii_inst = sc->mii_inst; 362 (void) (*other->mii_service)(other, mii, MII_POLLSTAT); 363 other->mii_inst = other_inst; 364 sc->mii_media_active = other->mii_media_active; 365 sc->mii_media_status = other->mii_media_status; 366 } else 367 ukphy_status(sc); 368 369 /* Callback if something changed. */ 370 mii_phy_update(sc, cmd); 371 return (0); 372 } 373 374 /* 375 * The Micro Linear PHY comes out of reset with the 'autoneg 376 * enable' bit set, which we don't want. 377 */ 378 static void 379 mlphy_reset(sc) 380 struct mii_softc *sc; 381 { 382 int reg; 383 384 mii_phy_reset(sc); 385 reg = PHY_READ(sc, MII_BMCR); 386 reg &= ~BMCR_AUTOEN; 387 PHY_WRITE(sc, MII_BMCR, reg); 388 389 return; 390 } 391 392 /* 393 * If we negotiate a 10Mbps mode, we need to check for an alternate 394 * PHY and make sure it's enabled and set correctly. 395 */ 396 static void 397 mlphy_status(sc) 398 struct mii_softc *sc; 399 { 400 struct mlphy_softc *msc = (struct mlphy_softc *)sc; 401 struct mii_data *mii = msc->ml_mii.mii_pdata; 402 struct mii_softc *other = NULL; 403 device_t *devlist; 404 int devs, i; 405 406 /* See if there's another PHY on the bus with us. */ 407 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 408 for (i = 0; i < devs; i++) { 409 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 410 other = device_get_softc(devlist[i]); 411 break; 412 } 413 } 414 free(devlist, M_TEMP); 415 416 if (other == NULL) 417 return; 418 419 ukphy_status(sc); 420 421 if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) { 422 msc->ml_state = ML_STATE_AUTO_SELF; 423 mii_phy_reset(other); 424 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 425 } 426 427 if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) { 428 msc->ml_state = ML_STATE_AUTO_OTHER; 429 mlphy_reset(&msc->ml_mii); 430 PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO); 431 mii_phy_reset(other); 432 mii_phy_auto(other); 433 } 434 435 return; 436 }
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