1 /* 2 3 mii.c: MII interface library 4 5 Maintained by Jeff Garzik <jgarzik@pobox.com> 6 Copyright 2001,2002 Jeff Garzik 7 8 Various code came from myson803.c and other files by 9 Donald Becker. Copyright: 10 11 Written 1998-2002 by Donald Becker. 12 13 This software may be used and distributed according 14 to the terms of the GNU General Public License (GPL), 15 incorporated herein by reference. Drivers based on 16 or derived from this code fall under the GPL and must 17 retain the authorship, copyright and license notice. 18 This file is not a complete program and may only be 19 used when the entire operating system is licensed 20 under the GPL. 21 22 The author may be reached as becker@scyld.com, or C/O 23 Scyld Computing Corporation 24 410 Severn Ave., Suite 210 25 Annapolis MD 21403 26 27 28 */ 29 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/netdevice.h> 33 #include <linux/ethtool.h> 34 #include <linux/mii.h> 35 36 /** 37 * mii_ethtool_gset - get settings that are specified in @ecmd 38 * @mii: MII interface 39 * @ecmd: requested ethtool_cmd 40 * 41 * Returns 0 for success, negative on error. 42 */ 43 int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd) 44 { 45 struct net_device *dev = mii->dev; 46 u32 advert, bmcr, lpa, nego; 47 u32 advert2 = 0, bmcr2 = 0, lpa2 = 0; 48 49 ecmd->supported = 50 (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | 51 SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | 52 SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII); 53 if (mii->supports_gmii) 54 ecmd->supported |= SUPPORTED_1000baseT_Half | 55 SUPPORTED_1000baseT_Full; 56 57 /* only supports twisted-pair */ 58 ecmd->port = PORT_MII; 59 60 /* only supports internal transceiver */ 61 ecmd->transceiver = XCVR_INTERNAL; 62 63 /* this isn't fully supported at higher layers */ 64 ecmd->phy_address = mii->phy_id; 65 66 ecmd->advertising = ADVERTISED_TP | ADVERTISED_MII; 67 advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE); 68 if (mii->supports_gmii) 69 advert2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); 70 71 if (advert & ADVERTISE_10HALF) 72 ecmd->advertising |= ADVERTISED_10baseT_Half; 73 if (advert & ADVERTISE_10FULL) 74 ecmd->advertising |= ADVERTISED_10baseT_Full; 75 if (advert & ADVERTISE_100HALF) 76 ecmd->advertising |= ADVERTISED_100baseT_Half; 77 if (advert & ADVERTISE_100FULL) 78 ecmd->advertising |= ADVERTISED_100baseT_Full; 79 if (advert2 & ADVERTISE_1000HALF) 80 ecmd->advertising |= ADVERTISED_1000baseT_Half; 81 if (advert2 & ADVERTISE_1000FULL) 82 ecmd->advertising |= ADVERTISED_1000baseT_Full; 83 84 bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); 85 lpa = mii->mdio_read(dev, mii->phy_id, MII_LPA); 86 if (mii->supports_gmii) { 87 bmcr2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); 88 lpa2 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000); 89 } 90 if (bmcr & BMCR_ANENABLE) { 91 ecmd->advertising |= ADVERTISED_Autoneg; 92 ecmd->autoneg = AUTONEG_ENABLE; 93 94 nego = mii_nway_result(advert & lpa); 95 if ((bmcr2 & (ADVERTISE_1000HALF | ADVERTISE_1000FULL)) & 96 (lpa2 >> 2)) 97 ecmd->speed = SPEED_1000; 98 else if (nego == LPA_100FULL || nego == LPA_100HALF) 99 ecmd->speed = SPEED_100; 100 else 101 ecmd->speed = SPEED_10; 102 if ((lpa2 & LPA_1000FULL) || nego == LPA_100FULL || 103 nego == LPA_10FULL) { 104 ecmd->duplex = DUPLEX_FULL; 105 mii->full_duplex = 1; 106 } else { 107 ecmd->duplex = DUPLEX_HALF; 108 mii->full_duplex = 0; 109 } 110 } else { 111 ecmd->autoneg = AUTONEG_DISABLE; 112 113 ecmd->speed = ((bmcr & BMCR_SPEED1000 && 114 (bmcr & BMCR_SPEED100) == 0) ? SPEED_1000 : 115 (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10); 116 ecmd->duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF; 117 } 118 119 /* ignore maxtxpkt, maxrxpkt for now */ 120 121 return 0; 122 } 123 124 /** 125 * mii_ethtool_sset - set settings that are specified in @ecmd 126 * @mii: MII interface 127 * @ecmd: requested ethtool_cmd 128 * 129 * Returns 0 for success, negative on error. 130 */ 131 int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd) 132 { 133 struct net_device *dev = mii->dev; 134 135 if (ecmd->speed != SPEED_10 && 136 ecmd->speed != SPEED_100 && 137 ecmd->speed != SPEED_1000) 138 return -EINVAL; 139 if (ecmd->duplex != DUPLEX_HALF && ecmd->duplex != DUPLEX_FULL) 140 return -EINVAL; 141 if (ecmd->port != PORT_MII) 142 return -EINVAL; 143 if (ecmd->transceiver != XCVR_INTERNAL) 144 return -EINVAL; 145 if (ecmd->phy_address != mii->phy_id) 146 return -EINVAL; 147 if (ecmd->autoneg != AUTONEG_DISABLE && ecmd->autoneg != AUTONEG_ENABLE) 148 return -EINVAL; 149 if ((ecmd->speed == SPEED_1000) && (!mii->supports_gmii)) 150 return -EINVAL; 151 152 /* ignore supported, maxtxpkt, maxrxpkt */ 153 154 if (ecmd->autoneg == AUTONEG_ENABLE) { 155 u32 bmcr, advert, tmp; 156 u32 advert2 = 0, tmp2 = 0; 157 158 if ((ecmd->advertising & (ADVERTISED_10baseT_Half | 159 ADVERTISED_10baseT_Full | 160 ADVERTISED_100baseT_Half | 161 ADVERTISED_100baseT_Full | 162 ADVERTISED_1000baseT_Half | 163 ADVERTISED_1000baseT_Full)) == 0) 164 return -EINVAL; 165 166 /* advertise only what has been requested */ 167 advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE); 168 tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4); 169 if (mii->supports_gmii) { 170 advert2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000); 171 tmp2 = advert2 & ~(ADVERTISE_1000HALF | ADVERTISE_1000FULL); 172 } 173 if (ecmd->advertising & ADVERTISED_10baseT_Half) 174 tmp |= ADVERTISE_10HALF; 175 if (ecmd->advertising & ADVERTISED_10baseT_Full) 176 tmp |= ADVERTISE_10FULL; 177 if (ecmd->advertising & ADVERTISED_100baseT_Half) 178 tmp |= ADVERTISE_100HALF; 179 if (ecmd->advertising & ADVERTISED_100baseT_Full) 180 tmp |= ADVERTISE_100FULL; 181 if (mii->supports_gmii) { 182 if (ecmd->advertising & ADVERTISED_1000baseT_Half) 183 tmp2 |= ADVERTISE_1000HALF; 184 if (ecmd->advertising & ADVERTISED_1000baseT_Full) 185 tmp2 |= ADVERTISE_1000FULL; 186 } 187 if (advert != tmp) { 188 mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp); 189 mii->advertising = tmp; 190 } 191 if ((mii->supports_gmii) && (advert2 != tmp2)) 192 mii->mdio_write(dev, mii->phy_id, MII_CTRL1000, tmp2); 193 194 /* turn on autonegotiation, and force a renegotiate */ 195 bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); 196 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); 197 mii->mdio_write(dev, mii->phy_id, MII_BMCR, bmcr); 198 199 mii->force_media = 0; 200 } else { 201 u32 bmcr, tmp; 202 203 /* turn off auto negotiation, set speed and duplexity */ 204 bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR); 205 tmp = bmcr & ~(BMCR_ANENABLE | BMCR_SPEED100 | 206 BMCR_SPEED1000 | BMCR_FULLDPLX); 207 if (ecmd->speed == SPEED_1000) 208 tmp |= BMCR_SPEED1000; 209 else if (ecmd->speed == SPEED_100) 210 tmp |= BMCR_SPEED100; 211 if (ecmd->duplex == DUPLEX_FULL) { 212 tmp |= BMCR_FULLDPLX; 213 mii->full_duplex = 1; 214 } else 215 mii->full_duplex = 0; 216 if (bmcr != tmp) 217 mii->mdio_write(dev, mii->phy_id, MII_BMCR, tmp); 218 219 mii->force_media = 1; 220 } 221 return 0; 222 } 223 224 /** 225 * mii_check_gmii_support - check if the MII supports Gb interfaces 226 * @mii: the MII interface 227 */ 228 int mii_check_gmii_support(struct mii_if_info *mii) 229 { 230 int reg; 231 232 reg = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR); 233 if (reg & BMSR_ESTATEN) { 234 reg = mii->mdio_read(mii->dev, mii->phy_id, MII_ESTATUS); 235 if (reg & (ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) 236 return 1; 237 } 238 239 return 0; 240 } 241 242 /** 243 * mii_link_ok - is link status up/ok 244 * @mii: the MII interface 245 * 246 * Returns 1 if the MII reports link status up/ok, 0 otherwise. 247 */ 248 int mii_link_ok (struct mii_if_info *mii) 249 { 250 /* first, a dummy read, needed to latch some MII phys */ 251 mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR); 252 if (mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR) & BMSR_LSTATUS) 253 return 1; 254 return 0; 255 } 256 257 /** 258 * mii_nway_restart - restart NWay (autonegotiation) for this interface 259 * @mii: the MII interface 260 * 261 * Returns 0 on success, negative on error. 262 */ 263 int mii_nway_restart (struct mii_if_info *mii) 264 { 265 int bmcr; 266 int r = -EINVAL; 267 268 /* if autoneg is off, it's an error */ 269 bmcr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMCR); 270 271 if (bmcr & BMCR_ANENABLE) { 272 bmcr |= BMCR_ANRESTART; 273 mii->mdio_write(mii->dev, mii->phy_id, MII_BMCR, bmcr); 274 r = 0; 275 } 276 277 return r; 278 } 279 280 /** 281 * mii_check_link - check MII link status 282 * @mii: MII interface 283 * 284 * If the link status changed (previous != current), call 285 * netif_carrier_on() if current link status is Up or call 286 * netif_carrier_off() if current link status is Down. 287 */ 288 void mii_check_link (struct mii_if_info *mii) 289 { 290 int cur_link = mii_link_ok(mii); 291 int prev_link = netif_carrier_ok(mii->dev); 292 293 if (cur_link && !prev_link) 294 netif_carrier_on(mii->dev); 295 else if (prev_link && !cur_link) 296 netif_carrier_off(mii->dev); 297 } 298 299 /** 300 * mii_check_media - check the MII interface for a duplex change 301 * @mii: the MII interface 302 * @ok_to_print: OK to print link up/down messages 303 * @init_media: OK to save duplex mode in @mii 304 * 305 * Returns 1 if the duplex mode changed, 0 if not. 306 * If the media type is forced, always returns 0. 307 */ 308 unsigned int mii_check_media (struct mii_if_info *mii, 309 unsigned int ok_to_print, 310 unsigned int init_media) 311 { 312 unsigned int old_carrier, new_carrier; 313 int advertise, lpa, media, duplex; 314 int lpa2 = 0; 315 316 /* if forced media, go no further */ 317 if (mii->force_media) 318 return 0; /* duplex did not change */ 319 320 /* check current and old link status */ 321 old_carrier = netif_carrier_ok(mii->dev) ? 1 : 0; 322 new_carrier = (unsigned int) mii_link_ok(mii); 323 324 /* if carrier state did not change, this is a "bounce", 325 * just exit as everything is already set correctly 326 */ 327 if ((!init_media) && (old_carrier == new_carrier)) 328 return 0; /* duplex did not change */ 329 330 /* no carrier, nothing much to do */ 331 if (!new_carrier) { 332 netif_carrier_off(mii->dev); 333 if (ok_to_print) 334 printk(KERN_INFO "%s: link down\n", mii->dev->name); 335 return 0; /* duplex did not change */ 336 } 337 338 /* 339 * we have carrier, see who's on the other end 340 */ 341 netif_carrier_on(mii->dev); 342 343 /* get MII advertise and LPA values */ 344 if ((!init_media) && (mii->advertising)) 345 advertise = mii->advertising; 346 else { 347 advertise = mii->mdio_read(mii->dev, mii->phy_id, MII_ADVERTISE); 348 mii->advertising = advertise; 349 } 350 lpa = mii->mdio_read(mii->dev, mii->phy_id, MII_LPA); 351 if (mii->supports_gmii) 352 lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000); 353 354 /* figure out media and duplex from advertise and LPA values */ 355 media = mii_nway_result(lpa & advertise); 356 duplex = (media & ADVERTISE_FULL) ? 1 : 0; 357 if (lpa2 & LPA_1000FULL) 358 duplex = 1; 359 360 if (ok_to_print) 361 printk(KERN_INFO "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n", 362 mii->dev->name, 363 lpa2 & (LPA_1000FULL | LPA_1000HALF) ? "1000" : 364 media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? "100" : "10", 365 duplex ? "full" : "half", 366 lpa); 367 368 if ((init_media) || (mii->full_duplex != duplex)) { 369 mii->full_duplex = duplex; 370 return 1; /* duplex changed */ 371 } 372 373 return 0; /* duplex did not change */ 374 } 375 376 /** 377 * generic_mii_ioctl - main MII ioctl interface 378 * @mii_if: the MII interface 379 * @mii_data: MII ioctl data structure 380 * @cmd: MII ioctl command 381 * @duplex_chg_out: pointer to @duplex_changed status if there was no 382 * ioctl error 383 * 384 * Returns 0 on success, negative on error. 385 */ 386 int generic_mii_ioctl(struct mii_if_info *mii_if, 387 struct mii_ioctl_data *mii_data, int cmd, 388 unsigned int *duplex_chg_out) 389 { 390 int rc = 0; 391 unsigned int duplex_changed = 0; 392 393 if (duplex_chg_out) 394 *duplex_chg_out = 0; 395 396 mii_data->phy_id &= mii_if->phy_id_mask; 397 mii_data->reg_num &= mii_if->reg_num_mask; 398 399 switch(cmd) { 400 case SIOCGMIIPHY: 401 mii_data->phy_id = mii_if->phy_id; 402 /* fall through */ 403 404 case SIOCGMIIREG: 405 mii_data->val_out = 406 mii_if->mdio_read(mii_if->dev, mii_data->phy_id, 407 mii_data->reg_num); 408 break; 409 410 case SIOCSMIIREG: { 411 u16 val = mii_data->val_in; 412 413 if (!capable(CAP_NET_ADMIN)) 414 return -EPERM; 415 416 if (mii_data->phy_id == mii_if->phy_id) { 417 switch(mii_data->reg_num) { 418 case MII_BMCR: { 419 unsigned int new_duplex = 0; 420 if (val & (BMCR_RESET|BMCR_ANENABLE)) 421 mii_if->force_media = 0; 422 else 423 mii_if->force_media = 1; 424 if (mii_if->force_media && 425 (val & BMCR_FULLDPLX)) 426 new_duplex = 1; 427 if (mii_if->full_duplex != new_duplex) { 428 duplex_changed = 1; 429 mii_if->full_duplex = new_duplex; 430 } 431 break; 432 } 433 case MII_ADVERTISE: 434 mii_if->advertising = val; 435 break; 436 default: 437 /* do nothing */ 438 break; 439 } 440 } 441 442 mii_if->mdio_write(mii_if->dev, mii_data->phy_id, 443 mii_data->reg_num, val); 444 break; 445 } 446 447 default: 448 rc = -EOPNOTSUPP; 449 break; 450 } 451 452 if ((rc == 0) && (duplex_chg_out) && (duplex_changed)) 453 *duplex_chg_out = 1; 454 455 return rc; 456 } 457 458 MODULE_AUTHOR ("Jeff Garzik <jgarzik@pobox.com>"); 459 MODULE_DESCRIPTION ("MII hardware support library"); 460 MODULE_LICENSE("GPL"); 461 462 EXPORT_SYMBOL(mii_link_ok); 463 EXPORT_SYMBOL(mii_nway_restart); 464 EXPORT_SYMBOL(mii_ethtool_gset); 465 EXPORT_SYMBOL(mii_ethtool_sset); 466 EXPORT_SYMBOL(mii_check_link); 467 EXPORT_SYMBOL(mii_check_media); 468 EXPORT_SYMBOL(mii_check_gmii_support); 469 EXPORT_SYMBOL(generic_mii_ioctl); 470 471