Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/netif/mii_layer/mlphy.c
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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 * $FreeBSD: src/sys/dev/mii/mlphy.c,v 1.2.2.3 2001/02/09 09:50:15 asmodai Exp $ 33 */ 34 35 /* 36 * driver for Micro Linear 6692 PHYs 37 * 38 * The Micro Linear 6692 is a strange beast, and dealing with it using 39 * this code framework is tricky. The 6692 is actually a 100Mbps-only 40 * device, which means that a second PHY is required to support 10Mbps 41 * modes. However, even though the 6692 does not support 10Mbps modes, 42 * it can still advertise them when performing autonegotiation. If a 43 * 10Mbps mode is negotiated, we must program the registers of the 44 * companion PHY accordingly in addition to programming the registers 45 * of the 6692. 46 * 47 * This device also does not have vendor/device ID registers. 48 */ 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/socket.h> 55 #include <sys/module.h> 56 #include <sys/bus.h> 57 58 #include <machine/clock.h> 59 60 #include <net/if.h> 61 #include <net/if_media.h> 62 63 #include "mii.h" 64 #include "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 static int mlphy_detach (device_t); 80 81 static device_method_t mlphy_methods[] = { 82 /* device interface */ 83 DEVMETHOD(device_probe, mlphy_probe), 84 DEVMETHOD(device_attach, mlphy_attach), 85 DEVMETHOD(device_detach, mlphy_detach), 86 DEVMETHOD(device_shutdown, bus_generic_shutdown), 87 DEVMETHOD_END 88 }; 89 90 static devclass_t mlphy_devclass; 91 92 static driver_t mlphy_driver = { 93 "mlphy", 94 mlphy_methods, 95 sizeof(struct mlphy_softc) 96 }; 97 98 DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, NULL, NULL); 99 100 static int mlphy_service (struct mii_softc *, struct mii_data *, int); 101 static void mlphy_reset (struct mii_softc *); 102 static void mlphy_status (struct mii_softc *); 103 104 static int 105 mlphy_probe(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(device_t dev) 135 { 136 struct mlphy_softc *msc; 137 struct mii_softc *sc; 138 struct mii_attach_args *ma; 139 struct mii_data *mii; 140 141 msc = device_get_softc(dev); 142 sc = &msc->ml_mii; 143 ma = device_get_ivars(dev); 144 mii_softc_init(sc, ma); 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_service = mlphy_service; 151 sc->mii_reset = mlphy_reset; 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 MII_MEDIA_NONE); 161 #endif 162 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst), 163 MII_MEDIA_100_TX); 164 165 sc->mii_flags &= ~MIIF_NOISOLATE; 166 mii_phy_reset(sc); 167 sc->mii_flags |= MIIF_NOISOLATE; 168 169 sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask; 170 171 device_printf(dev, " "); 172 if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0) 173 kprintf("no media present"); 174 else 175 mii_phy_add_media(sc); 176 kprintf("\n"); 177 #undef ADD 178 MIIBUS_MEDIAINIT(sc->mii_dev); 179 return(0); 180 } 181 182 static int 183 mlphy_detach(device_t dev) 184 { 185 struct mlphy_softc *sc; 186 187 sc = device_get_softc(dev); 188 sc->ml_mii.mii_dev = NULL; 189 LIST_REMOVE(&sc->ml_mii, mii_list); 190 191 return(0); 192 } 193 194 static int 195 mlphy_service(struct mii_softc *xsc, struct mii_data *mii, int cmd) 196 { 197 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 198 int reg; 199 struct mii_softc *other = NULL; 200 struct mlphy_softc *msc = (struct mlphy_softc *)xsc; 201 struct mii_softc *sc = &msc->ml_mii; 202 device_t *devlist; 203 int devs, i; 204 const struct mii_media *mm; 205 206 /* 207 * See if there's another PHY on this bus with us. 208 * If so, we may need it for 10Mbps modes. 209 */ 210 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 211 for (i = 0; i < devs; i++) { 212 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 213 other = device_get_softc(devlist[i]); 214 break; 215 } 216 } 217 kfree(devlist, M_TEMP); 218 219 KKASSERT(ife->ifm_data >= 0 && ife->ifm_data < MII_NMEDIA); 220 mm = &mii_media_table[ife->ifm_data]; 221 222 switch (cmd) { 223 case MII_POLLSTAT: 224 /* 225 * If we're not polling our PHY instance, just return. 226 */ 227 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 228 return (0); 229 break; 230 231 case MII_MEDIACHG: 232 /* 233 * If the media indicates a different PHY instance, 234 * isolate ourselves. 235 */ 236 if (IFM_INST(ife->ifm_media) != sc->mii_inst) { 237 reg = PHY_READ(sc, MII_BMCR); 238 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO); 239 return (0); 240 } 241 242 /* 243 * If the interface is not up, don't do anything. 244 */ 245 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 246 break; 247 248 switch (IFM_SUBTYPE(ife->ifm_media)) { 249 case IFM_AUTO: 250 /* 251 * For autonegotiation, reset and isolate the 252 * companion PHY (if any) and then do NWAY 253 * autonegotiation ourselves. 254 */ 255 msc->ml_state = ML_STATE_AUTO_SELF; 256 if (other != NULL) { 257 mii_phy_reset(other); 258 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 259 } 260 mii_phy_auto(sc, 1); 261 msc->ml_linked = 0; 262 return(0); 263 264 case IFM_10_T: 265 /* 266 * For 10baseT modes, reset and program the 267 * companion PHY (of any), then program ourselves 268 * to match. This will put us in pass-through 269 * mode and let the companion PHY do all the 270 * work. 271 */ 272 if (other != NULL) { 273 mii_phy_reset(other); 274 PHY_WRITE(other, MII_BMCR, mm->mm_bmcr); 275 } 276 PHY_WRITE(sc, MII_ANAR, mm->mm_anar); 277 PHY_WRITE(sc, MII_BMCR, mm->mm_bmcr); 278 msc->ml_state = 0; 279 break; 280 281 case IFM_100_TX: 282 /* 283 * For 100baseTX modes, reset and isolate the 284 * companion PHY (if any), then program ourselves 285 * accordingly. 286 */ 287 if (other != NULL) { 288 mii_phy_reset(other); 289 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 290 } 291 PHY_WRITE(sc, MII_ANAR, mm->mm_anar); 292 PHY_WRITE(sc, MII_BMCR, mm->mm_bmcr); 293 msc->ml_state = 0; 294 break; 295 296 case IFM_100_T4: 297 /* 298 * XXX Not supported as a manual setting right now. 299 */ 300 return (EINVAL); 301 default: 302 break; 303 } 304 break; 305 306 case MII_TICK: 307 /* 308 * If we're not currently selected, just return. 309 */ 310 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 311 return (0); 312 313 /* 314 * Is the interface even up? 315 */ 316 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 317 return (0); 318 319 /* 320 * Only used for autonegotiation. 321 */ 322 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) 323 break; 324 325 /* 326 * Check to see if we have link. If we do, we don't 327 * need to restart the autonegotiation process. Read 328 * the BMSR twice in case it's latched. 329 * If we're in a 10Mbps mode, check the link of the 330 * 10Mbps PHY. Sometimes the Micro Linear PHY's 331 * linkstat bit will clear while the linkstat bit of 332 * the companion PHY will remain set. 333 */ 334 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 335 reg = PHY_READ(other, MII_BMSR) | 336 PHY_READ(other, MII_BMSR); 337 } else { 338 reg = PHY_READ(sc, MII_BMSR) | 339 PHY_READ(sc, MII_BMSR); 340 } 341 if (reg & BMSR_LINK) { 342 if (!msc->ml_linked) { 343 msc->ml_linked = 1; 344 mlphy_status(sc); 345 } 346 sc->mii_ticks = 0; 347 break; 348 } 349 350 /* 351 * Only retry autonegotiation every 5 seconds. 352 */ 353 if (++sc->mii_ticks <= sc->mii_anegticks) 354 return (0); 355 356 sc->mii_ticks = 0; 357 msc->ml_linked = 0; 358 mii->mii_media_active = IFM_NONE; 359 mii_phy_reset(sc); 360 msc->ml_state = ML_STATE_AUTO_SELF; 361 if (other != NULL) { 362 mii_phy_reset(other); 363 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 364 } 365 if (mii_phy_auto(sc, 0) == EJUSTRETURN) 366 return(0); 367 break; 368 } 369 370 /* Update the media status. */ 371 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 372 int other_inst; 373 374 other_inst = other->mii_inst; 375 other->mii_inst = sc->mii_inst; 376 other->mii_service(other, mii, MII_POLLSTAT); 377 other->mii_inst = other_inst; 378 sc->mii_media_active = other->mii_media_active; 379 sc->mii_media_status = other->mii_media_status; 380 } else { 381 ukphy_status(sc); 382 } 383 384 /* Callback if something changed. */ 385 mii_phy_update(sc, cmd); 386 return (0); 387 } 388 389 /* 390 * The Micro Linear PHY comes out of reset with the 'autoneg 391 * enable' bit set, which we don't want. 392 */ 393 static void 394 mlphy_reset(struct mii_softc *sc) 395 { 396 int reg; 397 398 mii_phy_reset(sc); 399 reg = PHY_READ(sc, MII_BMCR); 400 reg &= ~BMCR_AUTOEN; 401 PHY_WRITE(sc, MII_BMCR, reg); 402 } 403 404 /* 405 * If we negotiate a 10Mbps mode, we need to check for an alternate 406 * PHY and make sure it's enabled and set correctly. 407 */ 408 static void 409 mlphy_status(struct mii_softc *sc) 410 { 411 struct mlphy_softc *msc = (struct mlphy_softc *)sc; 412 struct mii_data *mii = msc->ml_mii.mii_pdata; 413 struct mii_softc *other = NULL; 414 device_t *devlist; 415 int devs, i; 416 417 /* See if there's another PHY on the bus with us. */ 418 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 419 for (i = 0; i < devs; i++) { 420 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 421 other = device_get_softc(devlist[i]); 422 break; 423 } 424 } 425 kfree(devlist, M_TEMP); 426 427 if (other == NULL) 428 return; 429 430 ukphy_status(sc); 431 432 if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) { 433 msc->ml_state = ML_STATE_AUTO_SELF; 434 mii_phy_reset(other); 435 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 436 } 437 438 if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) { 439 msc->ml_state = ML_STATE_AUTO_OTHER; 440 mlphy_reset(&msc->ml_mii); 441 PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO); 442 mii_phy_reset(other); 443 mii_phy_auto(other, 1); 444 } 445 }
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