mlphy.c revision 69925
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: head/sys/dev/mii/mlphy.c 69925 2000-12-12 19:31:14Z wpaul $ 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/socket.h> 54#include <sys/module.h> 55#include <sys/bus.h> 56 57 58#include <net/if.h> 59#include <net/if_media.h> 60 61#include <dev/mii/mii.h> 62#include <dev/mii/miivar.h> 63 64#include "miibus_if.h" 65 66#define ML_STATE_AUTO_SELF 1 67#define ML_STATE_AUTO_OTHER 2 68 69struct mlphy_softc { 70 struct mii_softc ml_mii; 71 int ml_state; 72 int ml_linked; 73}; 74 75static int mlphy_probe __P((device_t)); 76static int mlphy_attach __P((device_t)); 77static int mlphy_detach __P((device_t)); 78 79static device_method_t mlphy_methods[] = { 80 /* device interface */ 81 DEVMETHOD(device_probe, mlphy_probe), 82 DEVMETHOD(device_attach, mlphy_attach), 83 DEVMETHOD(device_detach, mlphy_detach), 84 DEVMETHOD(device_shutdown, bus_generic_shutdown), 85 { 0, 0 } 86}; 87 88static devclass_t mlphy_devclass; 89 90static driver_t mlphy_driver = { 91 "mlphy", 92 mlphy_methods, 93 sizeof(struct mlphy_softc) 94}; 95 96DRIVER_MODULE(mlphy, miibus, mlphy_driver, mlphy_devclass, 0, 0); 97 98static int mlphy_service __P((struct mii_softc *, struct mii_data *, int)); 99static void mlphy_reset __P((struct mii_softc *)); 100static void mlphy_status __P((struct mii_softc *)); 101 102static int mlphy_probe(dev) 103 device_t dev; 104{ 105 struct mii_attach_args *ma; 106 device_t parent; 107 108 ma = device_get_ivars(dev); 109 parent = device_get_parent(device_get_parent(dev)); 110 111 /* 112 * Micro Linear PHY reports oui == 0 model == 0 113 */ 114 if (MII_OUI(ma->mii_id1, ma->mii_id2) != 0 || 115 MII_MODEL(ma->mii_id2) != 0) 116 return (ENXIO); 117 118 /* 119 * Make sure the parent is a `tl'. So far, I have only 120 * encountered the 6692 on an Olicom card with a ThunderLAN 121 * controller chip. 122 */ 123 if (strcmp(device_get_name(parent), "tl") != 0) 124 return (ENXIO); 125 126 device_set_desc(dev, "Micro Linear 6692 media interface"); 127 128 return (0); 129} 130 131static int mlphy_attach(dev) 132 device_t dev; 133{ 134 struct mlphy_softc *msc; 135 struct mii_softc *sc; 136 struct mii_attach_args *ma; 137 struct mii_data *mii; 138 139 msc = device_get_softc(dev); 140 sc = &msc->ml_mii; 141 ma = device_get_ivars(dev); 142 sc->mii_dev = device_get_parent(dev); 143 mii = device_get_softc(sc->mii_dev); 144 LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list); 145 146 sc->mii_inst = mii->mii_instance; 147 sc->mii_phy = ma->mii_phyno; 148 sc->mii_service = mlphy_service; 149 sc->mii_pdata = mii; 150 151 mii->mii_instance++; 152 153#define ADD(m, c) ifmedia_add(&mii->mii_media, (m), (c), NULL) 154 155#if 0 /* See above. */ 156 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst), 157 BMCR_ISO); 158#endif 159 ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_LOOP, sc->mii_inst), 160 BMCR_LOOP|BMCR_S100); 161 162 sc->mii_flags &= ~MIIF_NOISOLATE; 163 mii_phy_reset(sc); 164 sc->mii_flags |= MIIF_NOISOLATE; 165 166 sc->mii_capabilities = 167 PHY_READ(sc, MII_BMSR) & ma->mii_capmask; 168 ma->mii_capmask = ~sc->mii_capabilities; 169 device_printf(dev, " "); 170 if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0) 171 printf("no media present"); 172 else 173 mii_add_media(mii, sc->mii_capabilities, 174 sc->mii_inst); 175 printf("\n"); 176#undef ADD 177 MIIBUS_MEDIAINIT(sc->mii_dev); 178 return(0); 179} 180 181static int mlphy_detach(dev) 182 device_t dev; 183{ 184 struct mlphy_softc *sc; 185 struct mii_data *mii; 186 187 sc = device_get_softc(dev); 188 mii = device_get_softc(device_get_parent(dev)); 189 mii_phy_auto_stop(&sc->ml_mii); 190 sc->ml_mii.mii_dev = NULL; 191 LIST_REMOVE(&sc->ml_mii, mii_list); 192 193 return(0); 194} 195 196static int 197mlphy_service(xsc, mii, cmd) 198 struct mii_softc *xsc; 199 struct mii_data *mii; 200 int cmd; 201{ 202 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 203 int reg; 204 struct mii_softc *other = NULL; 205 struct mlphy_softc *msc = (struct mlphy_softc *)xsc; 206 struct mii_softc *sc = (struct mii_softc *)&msc->ml_mii; 207 device_t *devlist; 208 int devs, i; 209 210 /* 211 * See if there's another PHY on this bus with us. 212 * If so, we may need it for 10Mbps modes. 213 */ 214 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 215 for (i = 0; i < devs; i++) { 216 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 217 other = device_get_softc(devlist[i]); 218 break; 219 } 220 } 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 (void) mii_phy_auto(sc, 1); 261 msc->ml_linked = 0; 262 return(0); 263 break; 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 * BMCR data is stored in the ifmedia entry. 273 */ 274 if (other != NULL) { 275 mii_phy_reset(other); 276 PHY_WRITE(other, MII_BMCR, ife->ifm_data); 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_TX: 283 /* 284 * For 100baseTX modes, reset and isolate the 285 * companion PHY (if any), then program ourselves 286 * accordingly. 287 * 288 * BMCR data is stored in the ifmedia entry. 289 */ 290 if (other != NULL) { 291 mii_phy_reset(other); 292 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 293 } 294 PHY_WRITE(sc, MII_ANAR, mii_anar(ife->ifm_media)); 295 PHY_WRITE(sc, MII_BMCR, ife->ifm_data); 296 msc->ml_state = 0; 297 break; 298 case IFM_100_T4: 299 /* 300 * XXX Not supported as a manual setting right now. 301 */ 302 return (EINVAL); 303 default: 304 break; 305 306 } 307 break; 308 309 case MII_TICK: 310 /* 311 * If we're not currently selected, just return. 312 */ 313 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 314 return (0); 315 316 /* 317 * Only used for autonegotiation. 318 */ 319 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) 320 return (0); 321 322 /* 323 * Is the interface even up? 324 */ 325 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 326 return (0); 327 328 /* 329 * Only retry autonegotiation every 5 seconds. 330 */ 331 if (++sc->mii_ticks != 5) 332 return (0); 333 334 sc->mii_ticks = 0; 335 336 /* 337 * Check to see if we have link. If we do, we don't 338 * need to restart the autonegotiation process. Read 339 * the BMSR twice in case it's latched. 340 * If we're in a 10Mbps mode, check the link of the 341 * 10Mbps PHY. Sometimes the Micro Linear PHY's 342 * linkstat bit will clear while the linkstat bit of 343 * the companion PHY will remain set. 344 */ 345 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 346 reg = PHY_READ(other, MII_BMSR) | 347 PHY_READ(other, MII_BMSR); 348 } else { 349 reg = PHY_READ(sc, MII_BMSR) | 350 PHY_READ(sc, MII_BMSR); 351 } 352 353 if (reg & BMSR_LINK) { 354 if (!msc->ml_linked) { 355 msc->ml_linked = 1; 356 mlphy_status(sc); 357 break; 358 } 359 return(0); 360 } 361 362 msc->ml_linked = 0; 363 mii->mii_media_active = IFM_NONE; 364 mii_phy_reset(sc); 365 msc->ml_state = ML_STATE_AUTO_SELF; 366 if (other != NULL) { 367 mii_phy_reset(other); 368 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 369 } 370 if (mii_phy_auto(sc, 0) == EJUSTRETURN) 371 return(0); 372 break; 373 } 374 375 /* Update the media status. */ 376 377 if (msc->ml_state == ML_STATE_AUTO_OTHER) { 378 int other_inst; 379 other_inst = other->mii_inst; 380 other->mii_inst = sc->mii_inst; 381 (void) (*other->mii_service)(other, mii, MII_POLLSTAT); 382 other->mii_inst = other_inst; 383 sc->mii_active = other->mii_active; 384 } else 385 ukphy_status(sc); 386 387 /* Callback if something changed. */ 388 if (sc->mii_active != mii->mii_media_active || cmd == MII_MEDIACHG) { 389 MIIBUS_STATCHG(sc->mii_dev); 390 sc->mii_active = mii->mii_media_active; 391 } 392 393 return (0); 394} 395 396/* 397 * The Micro Linear PHY comes out of reset with the 'autoneg 398 * enable' bit set, which we don't want. 399 */ 400static void mlphy_reset(sc) 401 struct mii_softc *sc; 402{ 403 int reg; 404 405 mii_phy_reset(sc); 406 reg = PHY_READ(sc, MII_BMCR); 407 reg &= ~BMCR_AUTOEN; 408 PHY_WRITE(sc, MII_BMCR, reg); 409 410 return; 411} 412 413/* 414 * If we negotiate a 10Mbps mode, we need to check for an alternate 415 * PHY and make sure it's enabled and set correctly. 416 */ 417static void mlphy_status(sc) 418 struct mii_softc *sc; 419{ 420 struct mlphy_softc *msc = (struct mlphy_softc *)sc; 421 struct mii_data *mii = msc->ml_mii.mii_pdata; 422 struct mii_softc *other = NULL; 423 device_t *devlist; 424 int devs, i; 425 426 /* See if there's another PHY on the bus with us. */ 427 device_get_children(msc->ml_mii.mii_dev, &devlist, &devs); 428 for (i = 0; i < devs; i++) { 429 if (strcmp(device_get_name(devlist[i]), "mlphy")) { 430 other = device_get_softc(devlist[i]); 431 break; 432 } 433 } 434 435 if (other == NULL) 436 return; 437 438 ukphy_status(sc); 439 440 if (IFM_SUBTYPE(mii->mii_media_active) != IFM_10_T) { 441 msc->ml_state = ML_STATE_AUTO_SELF; 442 mii_phy_reset(other); 443 PHY_WRITE(other, MII_BMCR, BMCR_ISO); 444 } 445 446 if (IFM_SUBTYPE(mii->mii_media_active) == IFM_10_T) { 447 msc->ml_state = ML_STATE_AUTO_OTHER; 448 mlphy_reset(&msc->ml_mii); 449 PHY_WRITE(&msc->ml_mii, MII_BMCR, BMCR_ISO); 450 mii_phy_reset(other); 451 mii_phy_auto(other, 1); 452 } 453 454 return; 455} 456