drivers/net/phy/phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Framework for configuring and reading PHY devices
   3  * Based on code in sungem_phy.c and gianfar_phy.c
   4  *
   5  * Author: Andy Fleming
   6  *
   7  * Copyright (c) 2004 Freescale Semiconductor, Inc.
   8  * Copyright (c) 2006, 2007  Maciej W. Rozycki
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/errno.h>
  14 #include <linux/unistd.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/delay.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/mm.h>
  21 #include <linux/module.h>
  22 #include <linux/mii.h>
  23 #include <linux/ethtool.h>
  24 #include <linux/phy.h>
  25 #include <linux/phy_led_triggers.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/mdio.h>
  28 #include <linux/io.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/atomic.h>
  31
  32 #define PHY_STATE_TIME  HZ
  33
  34 #define PHY_STATE_STR(_state)                   \
  35         case PHY_##_state:                      \
  36                 return __stringify(_state);     \
  37
  38 static const char *phy_state_to_str(enum phy_state st)
  39 {
  40         switch (st) {
  41         PHY_STATE_STR(DOWN)
  42         PHY_STATE_STR(READY)
  43         PHY_STATE_STR(UP)
  44         PHY_STATE_STR(RUNNING)
  45         PHY_STATE_STR(NOLINK)
  46         PHY_STATE_STR(FORCING)
  47         PHY_STATE_STR(HALTED)
  48         }
  49
  50         return NULL;
  51 }
  52
  53 static void phy_link_up(struct phy_device *phydev)
  54 {
  55         phydev->phy_link_change(phydev, true, true);
  56         phy_led_trigger_change_speed(phydev);
  57 }
  58
  59 static void phy_link_down(struct phy_device *phydev, bool do_carrier)
  60 {
  61         phydev->phy_link_change(phydev, false, do_carrier);
  62         phy_led_trigger_change_speed(phydev);
  63 }
  64
  65 static const char *phy_pause_str(struct phy_device *phydev)
  66 {
  67         bool local_pause, local_asym_pause;
  68
  69         if (phydev->autoneg == AUTONEG_DISABLE)
  70                 goto no_pause;
  71
  72         local_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
  73                                         phydev->advertising);
  74         local_asym_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
  75                                              phydev->advertising);
  76
  77         if (local_pause && phydev->pause)
  78                 return "rx/tx";
  79
  80         if (local_asym_pause && phydev->asym_pause) {
  81                 if (local_pause)
  82                         return "rx";
  83                 if (phydev->pause)
  84                         return "tx";
  85         }
  86
  87 no_pause:
  88         return "off";
  89 }
  90
  91 /**
  92  * phy_print_status - Convenience function to print out the current phy status
  93  * @phydev: the phy_device struct
  94  */
  95 void phy_print_status(struct phy_device *phydev)
  96 {
  97         if (phydev->link) {
  98                 netdev_info(phydev->attached_dev,
  99                         "Link is Up - %s/%s - flow control %s\n",
 100                         phy_speed_to_str(phydev->speed),
 101                         phy_duplex_to_str(phydev->duplex),
 102                         phy_pause_str(phydev));
 103         } else  {
 104                 netdev_info(phydev->attached_dev, "Link is Down\n");
 105         }
 106 }
 107 EXPORT_SYMBOL(phy_print_status);
 108
 109 /**
 110  * phy_clear_interrupt - Ack the phy device's interrupt
 111  * @phydev: the phy_device struct
 112  *
 113  * If the @phydev driver has an ack_interrupt function, call it to
 114  * ack and clear the phy device's interrupt.
 115  *
 116  * Returns 0 on success or < 0 on error.
 117  */
 118 static int phy_clear_interrupt(struct phy_device *phydev)
 119 {
 120         if (phydev->drv->ack_interrupt)
 121                 return phydev->drv->ack_interrupt(phydev);
 122
 123         return 0;
 124 }
 125
 126 /**
 127  * phy_config_interrupt - configure the PHY device for the requested interrupts
 128  * @phydev: the phy_device struct
 129  * @interrupts: interrupt flags to configure for this @phydev
 130  *
 131  * Returns 0 on success or < 0 on error.
 132  */
 133 static int phy_config_interrupt(struct phy_device *phydev, bool interrupts)
 134 {
 135         phydev->interrupts = interrupts ? 1 : 0;
 136         if (phydev->drv->config_intr)
 137                 return phydev->drv->config_intr(phydev);
 138
 139         return 0;
 140 }
 141
 142 /**
 143  * phy_restart_aneg - restart auto-negotiation
 144  * @phydev: target phy_device struct
 145  *
 146  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
 147  * negative errno on error.
 148  */
 149 int phy_restart_aneg(struct phy_device *phydev)
 150 {
 151         int ret;
 152
 153         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 154                 ret = genphy_c45_restart_aneg(phydev);
 155         else
 156                 ret = genphy_restart_aneg(phydev);
 157
 158         return ret;
 159 }
 160 EXPORT_SYMBOL_GPL(phy_restart_aneg);
 161
 162 /**
 163  * phy_aneg_done - return auto-negotiation status
 164  * @phydev: target phy_device struct
 165  *
 166  * Description: Return the auto-negotiation status from this @phydev
 167  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 168  * is still pending.
 169  */
 170 int phy_aneg_done(struct phy_device *phydev)
 171 {
 172         if (phydev->drv && phydev->drv->aneg_done)
 173                 return phydev->drv->aneg_done(phydev);
 174         else if (phydev->is_c45)
 175                 return genphy_c45_aneg_done(phydev);
 176         else
 177                 return genphy_aneg_done(phydev);
 178 }
 179 EXPORT_SYMBOL(phy_aneg_done);
 180
 181 /**
 182  * phy_find_valid - find a PHY setting that matches the requested parameters
 183  * @speed: desired speed
 184  * @duplex: desired duplex
 185  * @supported: mask of supported link modes
 186  *
 187  * Locate a supported phy setting that is, in priority order:
 188  * - an exact match for the specified speed and duplex mode
 189  * - a match for the specified speed, or slower speed
 190  * - the slowest supported speed
 191  * Returns the matched phy_setting entry, or %NULL if no supported phy
 192  * settings were found.
 193  */
 194 static const struct phy_setting *
 195 phy_find_valid(int speed, int duplex, unsigned long *supported)
 196 {
 197         return phy_lookup_setting(speed, duplex, supported, false);
 198 }
 199
 200 /**
 201  * phy_supported_speeds - return all speeds currently supported by a phy device
 202  * @phy: The phy device to return supported speeds of.
 203  * @speeds: buffer to store supported speeds in.
 204  * @size:   size of speeds buffer.
 205  *
 206  * Description: Returns the number of supported speeds, and fills the speeds
 207  * buffer with the supported speeds. If speeds buffer is too small to contain
 208  * all currently supported speeds, will return as many speeds as can fit.
 209  */
 210 unsigned int phy_supported_speeds(struct phy_device *phy,
 211                                   unsigned int *speeds,
 212                                   unsigned int size)
 213 {
 214         return phy_speeds(speeds, size, phy->supported);
 215 }
 216
 217 /**
 218  * phy_check_valid - check if there is a valid PHY setting which matches
 219  *                   speed, duplex, and feature mask
 220  * @speed: speed to match
 221  * @duplex: duplex to match
 222  * @features: A mask of the valid settings
 223  *
 224  * Description: Returns true if there is a valid setting, false otherwise.
 225  */
 226 static inline bool phy_check_valid(int speed, int duplex,
 227                                    unsigned long *features)
 228 {
 229         return !!phy_lookup_setting(speed, duplex, features, true);
 230 }
 231
 232 /**
 233  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 234  * @phydev: the target phy_device struct
 235  *
 236  * Description: Make sure the PHY is set to supported speeds and
 237  *   duplexes.  Drop down by one in this order:  1000/FULL,
 238  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 239  */
 240 static void phy_sanitize_settings(struct phy_device *phydev)
 241 {
 242         const struct phy_setting *setting;
 243
 244         setting = phy_find_valid(phydev->speed, phydev->duplex,
 245                                  phydev->supported);
 246         if (setting) {
 247                 phydev->speed = setting->speed;
 248                 phydev->duplex = setting->duplex;
 249         } else {
 250                 /* We failed to find anything (no supported speeds?) */
 251                 phydev->speed = SPEED_UNKNOWN;
 252                 phydev->duplex = DUPLEX_UNKNOWN;
 253         }
 254 }
 255
 256 /**
 257  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 258  * @phydev: target phy_device struct
 259  * @cmd: ethtool_cmd
 260  *
 261  * A few notes about parameter checking:
 262  *
 263  * - We don't set port or transceiver, so we don't care what they
 264  *   were set to.
 265  * - phy_start_aneg() will make sure forced settings are sane, and
 266  *   choose the next best ones from the ones selected, so we don't
 267  *   care if ethtool tries to give us bad values.
 268  */
 269 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 270 {
 271         __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
 272         u32 speed = ethtool_cmd_speed(cmd);
 273
 274         if (cmd->phy_address != phydev->mdio.addr)
 275                 return -EINVAL;
 276
 277         /* We make sure that we don't pass unsupported values in to the PHY */
 278         ethtool_convert_legacy_u32_to_link_mode(advertising, cmd->advertising);
 279         linkmode_and(advertising, advertising, phydev->supported);
 280
 281         /* Verify the settings we care about. */
 282         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 283                 return -EINVAL;
 284
 285         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 286                 return -EINVAL;
 287
 288         if (cmd->autoneg == AUTONEG_DISABLE &&
 289             ((speed != SPEED_1000 &&
 290               speed != SPEED_100 &&
 291               speed != SPEED_10) ||
 292              (cmd->duplex != DUPLEX_HALF &&
 293               cmd->duplex != DUPLEX_FULL)))
 294                 return -EINVAL;
 295
 296         phydev->autoneg = cmd->autoneg;
 297
 298         phydev->speed = speed;
 299
 300         linkmode_copy(phydev->advertising, advertising);
 301
 302         if (AUTONEG_ENABLE == cmd->autoneg)
 303                 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 304                                  phydev->advertising);
 305         else
 306                 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 307                                    phydev->advertising);
 308
 309         phydev->duplex = cmd->duplex;
 310
 311         phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
 312
 313         /* Restart the PHY */
 314         phy_start_aneg(phydev);
 315
 316         return 0;
 317 }
 318 EXPORT_SYMBOL(phy_ethtool_sset);
 319
 320 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 321                               const struct ethtool_link_ksettings *cmd)
 322 {
 323         __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
 324         u8 autoneg = cmd->base.autoneg;
 325         u8 duplex = cmd->base.duplex;
 326         u32 speed = cmd->base.speed;
 327
 328         if (cmd->base.phy_address != phydev->mdio.addr)
 329                 return -EINVAL;
 330
 331         linkmode_copy(advertising, cmd->link_modes.advertising);
 332
 333         /* We make sure that we don't pass unsupported values in to the PHY */
 334         linkmode_and(advertising, advertising, phydev->supported);
 335
 336         /* Verify the settings we care about. */
 337         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 338                 return -EINVAL;
 339
 340         if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
 341                 return -EINVAL;
 342
 343         if (autoneg == AUTONEG_DISABLE &&
 344             ((speed != SPEED_1000 &&
 345               speed != SPEED_100 &&
 346               speed != SPEED_10) ||
 347              (duplex != DUPLEX_HALF &&
 348               duplex != DUPLEX_FULL)))
 349                 return -EINVAL;
 350
 351         phydev->autoneg = autoneg;
 352
 353         phydev->speed = speed;
 354
 355         linkmode_copy(phydev->advertising, advertising);
 356
 357         if (autoneg == AUTONEG_ENABLE)
 358                 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 359                                  phydev->advertising);
 360         else
 361                 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 362                                    phydev->advertising);
 363
 364         phydev->duplex = duplex;
 365
 366         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 367
 368         /* Restart the PHY */
 369         phy_start_aneg(phydev);
 370
 371         return 0;
 372 }
 373 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 374
 375 void phy_ethtool_ksettings_get(struct phy_device *phydev,
 376                                struct ethtool_link_ksettings *cmd)
 377 {
 378         linkmode_copy(cmd->link_modes.supported, phydev->supported);
 379         linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
 380         linkmode_copy(cmd->link_modes.lp_advertising, phydev->lp_advertising);
 381
 382         cmd->base.speed = phydev->speed;
 383         cmd->base.duplex = phydev->duplex;
 384         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 385                 cmd->base.port = PORT_BNC;
 386         else
 387                 cmd->base.port = PORT_MII;
 388         cmd->base.transceiver = phy_is_internal(phydev) ?
 389                                 XCVR_INTERNAL : XCVR_EXTERNAL;
 390         cmd->base.phy_address = phydev->mdio.addr;
 391         cmd->base.autoneg = phydev->autoneg;
 392         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 393         cmd->base.eth_tp_mdix = phydev->mdix;
 394 }
 395 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 396
 397 /**
 398  * phy_mii_ioctl - generic PHY MII ioctl interface
 399  * @phydev: the phy_device struct
 400  * @ifr: &struct ifreq for socket ioctl's
 401  * @cmd: ioctl cmd to execute
 402  *
 403  * Note that this function is currently incompatible with the
 404  * PHYCONTROL layer.  It changes registers without regard to
 405  * current state.  Use at own risk.
 406  */
 407 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 408 {
 409         struct mii_ioctl_data *mii_data = if_mii(ifr);
 410         u16 val = mii_data->val_in;
 411         bool change_autoneg = false;
 412         int prtad, devad;
 413
 414         switch (cmd) {
 415         case SIOCGMIIPHY:
 416                 mii_data->phy_id = phydev->mdio.addr;
 417                 /* fall through */
 418
 419         case SIOCGMIIREG:
 420                 if (mdio_phy_id_is_c45(mii_data->phy_id)) {
 421                         prtad = mdio_phy_id_prtad(mii_data->phy_id);
 422                         devad = mdio_phy_id_devad(mii_data->phy_id);
 423                         devad = MII_ADDR_C45 | devad << 16 | mii_data->reg_num;
 424                 } else {
 425                         prtad = mii_data->phy_id;
 426                         devad = mii_data->reg_num;
 427                 }
 428                 mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad,
 429                                                  devad);
 430                 return 0;
 431
 432         case SIOCSMIIREG:
 433                 if (mdio_phy_id_is_c45(mii_data->phy_id)) {
 434                         prtad = mdio_phy_id_prtad(mii_data->phy_id);
 435                         devad = mdio_phy_id_devad(mii_data->phy_id);
 436                         devad = MII_ADDR_C45 | devad << 16 | mii_data->reg_num;
 437                 } else {
 438                         prtad = mii_data->phy_id;
 439                         devad = mii_data->reg_num;
 440                 }
 441                 if (prtad == phydev->mdio.addr) {
 442                         switch (devad) {
 443                         case MII_BMCR:
 444                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 445                                         if (phydev->autoneg == AUTONEG_ENABLE)
 446                                                 change_autoneg = true;
 447                                         phydev->autoneg = AUTONEG_DISABLE;
 448                                         if (val & BMCR_FULLDPLX)
 449                                                 phydev->duplex = DUPLEX_FULL;
 450                                         else
 451                                                 phydev->duplex = DUPLEX_HALF;
 452                                         if (val & BMCR_SPEED1000)
 453                                                 phydev->speed = SPEED_1000;
 454                                         else if (val & BMCR_SPEED100)
 455                                                 phydev->speed = SPEED_100;
 456                                         else phydev->speed = SPEED_10;
 457                                 }
 458                                 else {
 459                                         if (phydev->autoneg == AUTONEG_DISABLE)
 460                                                 change_autoneg = true;
 461                                         phydev->autoneg = AUTONEG_ENABLE;
 462                                 }
 463                                 break;
 464                         case MII_ADVERTISE:
 465                                 mii_adv_mod_linkmode_adv_t(phydev->advertising,
 466                                                            val);
 467                                 change_autoneg = true;
 468                                 break;
 469                         default:
 470                                 /* do nothing */
 471                                 break;
 472                         }
 473                 }
 474
 475                 mdiobus_write(phydev->mdio.bus, prtad, devad, val);
 476
 477                 if (prtad == phydev->mdio.addr &&
 478                     devad == MII_BMCR &&
 479                     val & BMCR_RESET)
 480                         return phy_init_hw(phydev);
 481
 482                 if (change_autoneg)
 483                         return phy_start_aneg(phydev);
 484
 485                 return 0;
 486
 487         case SIOCSHWTSTAMP:
 488                 if (phydev->drv && phydev->drv->hwtstamp)
 489                         return phydev->drv->hwtstamp(phydev, ifr);
 490                 /* fall through */
 491
 492         default:
 493                 return -EOPNOTSUPP;
 494         }
 495 }
 496 EXPORT_SYMBOL(phy_mii_ioctl);
 497
 498 void phy_queue_state_machine(struct phy_device *phydev, unsigned long jiffies)
 499 {
 500         mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
 501                          jiffies);
 502 }
 503 EXPORT_SYMBOL(phy_queue_state_machine);
 504
 505 static void phy_trigger_machine(struct phy_device *phydev)
 506 {
 507         phy_queue_state_machine(phydev, 0);
 508 }
 509
 510 static int phy_config_aneg(struct phy_device *phydev)
 511 {
 512         if (phydev->drv->config_aneg)
 513                 return phydev->drv->config_aneg(phydev);
 514
 515         /* Clause 45 PHYs that don't implement Clause 22 registers are not
 516          * allowed to call genphy_config_aneg()
 517          */
 518         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 519                 return -EOPNOTSUPP;
 520
 521         return genphy_config_aneg(phydev);
 522 }
 523
 524 /**
 525  * phy_check_link_status - check link status and set state accordingly
 526  * @phydev: the phy_device struct
 527  *
 528  * Description: Check for link and whether autoneg was triggered / is running
 529  * and set state accordingly
 530  */
 531 static int phy_check_link_status(struct phy_device *phydev)
 532 {
 533         int err;
 534
 535         WARN_ON(!mutex_is_locked(&phydev->lock));
 536
 537         err = phy_read_status(phydev);
 538         if (err)
 539                 return err;
 540
 541         if (phydev->link && phydev->state != PHY_RUNNING) {
 542                 phydev->state = PHY_RUNNING;
 543                 phy_link_up(phydev);
 544         } else if (!phydev->link && phydev->state != PHY_NOLINK) {
 545                 phydev->state = PHY_NOLINK;
 546                 phy_link_down(phydev, true);
 547         }
 548
 549         return 0;
 550 }
 551
 552 /**
 553  * phy_start_aneg - start auto-negotiation for this PHY device
 554  * @phydev: the phy_device struct
 555  *
 556  * Description: Sanitizes the settings (if we're not autonegotiating
 557  *   them), and then calls the driver's config_aneg function.
 558  *   If the PHYCONTROL Layer is operating, we change the state to
 559  *   reflect the beginning of Auto-negotiation or forcing.
 560  */
 561 int phy_start_aneg(struct phy_device *phydev)
 562 {
 563         int err;
 564
 565         if (!phydev->drv)
 566                 return -EIO;
 567
 568         mutex_lock(&phydev->lock);
 569
 570         if (AUTONEG_DISABLE == phydev->autoneg)
 571                 phy_sanitize_settings(phydev);
 572
 573         /* Invalidate LP advertising flags */
 574         linkmode_zero(phydev->lp_advertising);
 575
 576         err = phy_config_aneg(phydev);
 577         if (err < 0)
 578                 goto out_unlock;
 579
 580         if (phy_is_started(phydev)) {
 581                 if (phydev->autoneg == AUTONEG_ENABLE) {
 582                         err = phy_check_link_status(phydev);
 583                 } else {
 584                         phydev->state = PHY_FORCING;
 585                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 586                 }
 587         }
 588
 589 out_unlock:
 590         mutex_unlock(&phydev->lock);
 591
 592         return err;
 593 }
 594 EXPORT_SYMBOL(phy_start_aneg);
 595
 596 static int phy_poll_aneg_done(struct phy_device *phydev)
 597 {
 598         unsigned int retries = 100;
 599         int ret;
 600
 601         do {
 602                 msleep(100);
 603                 ret = phy_aneg_done(phydev);
 604         } while (!ret && --retries);
 605
 606         if (!ret)
 607                 return -ETIMEDOUT;
 608
 609         return ret < 0 ? ret : 0;
 610 }
 611
 612 /**
 613  * phy_speed_down - set speed to lowest speed supported by both link partners
 614  * @phydev: the phy_device struct
 615  * @sync: perform action synchronously
 616  *
 617  * Description: Typically used to save energy when waiting for a WoL packet
 618  *
 619  * WARNING: Setting sync to false may cause the system being unable to suspend
 620  * in case the PHY generates an interrupt when finishing the autonegotiation.
 621  * This interrupt may wake up the system immediately after suspend.
 622  * Therefore use sync = false only if you're sure it's safe with the respective
 623  * network chip.
 624  */
 625 int phy_speed_down(struct phy_device *phydev, bool sync)
 626 {
 627         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 628         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
 629         int ret;
 630
 631         if (phydev->autoneg != AUTONEG_ENABLE)
 632                 return 0;
 633
 634         linkmode_copy(adv_old, phydev->advertising);
 635         linkmode_copy(adv, phydev->lp_advertising);
 636         linkmode_and(adv, adv, phydev->supported);
 637
 638         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, adv) ||
 639             linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, adv)) {
 640                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 641                                    phydev->advertising);
 642                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 643                                    phydev->advertising);
 644                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 645                                    phydev->advertising);
 646                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 647                                    phydev->advertising);
 648         } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 649                                      adv) ||
 650                    linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 651                                      adv)) {
 652                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 653                                    phydev->advertising);
 654                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 655                                    phydev->advertising);
 656         }
 657
 658         if (linkmode_equal(phydev->advertising, adv_old))
 659                 return 0;
 660
 661         ret = phy_config_aneg(phydev);
 662         if (ret)
 663                 return ret;
 664
 665         return sync ? phy_poll_aneg_done(phydev) : 0;
 666 }
 667 EXPORT_SYMBOL_GPL(phy_speed_down);
 668
 669 /**
 670  * phy_speed_up - (re)set advertised speeds to all supported speeds
 671  * @phydev: the phy_device struct
 672  *
 673  * Description: Used to revert the effect of phy_speed_down
 674  */
 675 int phy_speed_up(struct phy_device *phydev)
 676 {
 677         __ETHTOOL_DECLARE_LINK_MODE_MASK(all_speeds) = { 0, };
 678         __ETHTOOL_DECLARE_LINK_MODE_MASK(not_speeds);
 679         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 680         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 681         __ETHTOOL_DECLARE_LINK_MODE_MASK(speeds);
 682
 683         linkmode_copy(adv_old, phydev->advertising);
 684
 685         if (phydev->autoneg != AUTONEG_ENABLE)
 686                 return 0;
 687
 688         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, all_speeds);
 689         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, all_speeds);
 690         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, all_speeds);
 691         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, all_speeds);
 692         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, all_speeds);
 693         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, all_speeds);
 694
 695         linkmode_andnot(not_speeds, adv_old, all_speeds);
 696         linkmode_copy(supported, phydev->supported);
 697         linkmode_and(speeds, supported, all_speeds);
 698         linkmode_or(phydev->advertising, not_speeds, speeds);
 699
 700         if (linkmode_equal(phydev->advertising, adv_old))
 701                 return 0;
 702
 703         return phy_config_aneg(phydev);
 704 }
 705 EXPORT_SYMBOL_GPL(phy_speed_up);
 706
 707 /**
 708  * phy_start_machine - start PHY state machine tracking
 709  * @phydev: the phy_device struct
 710  *
 711  * Description: The PHY infrastructure can run a state machine
 712  *   which tracks whether the PHY is starting up, negotiating,
 713  *   etc.  This function starts the delayed workqueue which tracks
 714  *   the state of the PHY. If you want to maintain your own state machine,
 715  *   do not call this function.
 716  */
 717 void phy_start_machine(struct phy_device *phydev)
 718 {
 719         phy_trigger_machine(phydev);
 720 }
 721 EXPORT_SYMBOL_GPL(phy_start_machine);
 722
 723 /**
 724  * phy_stop_machine - stop the PHY state machine tracking
 725  * @phydev: target phy_device struct
 726  *
 727  * Description: Stops the state machine delayed workqueue, sets the
 728  *   state to UP (unless it wasn't up yet). This function must be
 729  *   called BEFORE phy_detach.
 730  */
 731 void phy_stop_machine(struct phy_device *phydev)
 732 {
 733         cancel_delayed_work_sync(&phydev->state_queue);
 734
 735         mutex_lock(&phydev->lock);
 736         if (phy_is_started(phydev))
 737                 phydev->state = PHY_UP;
 738         mutex_unlock(&phydev->lock);
 739 }
 740
 741 /**
 742  * phy_error - enter HALTED state for this PHY device
 743  * @phydev: target phy_device struct
 744  *
 745  * Moves the PHY to the HALTED state in response to a read
 746  * or write error, and tells the controller the link is down.
 747  * Must not be called from interrupt context, or while the
 748  * phydev->lock is held.
 749  */
 750 static void phy_error(struct phy_device *phydev)
 751 {
 752         WARN_ON(1);
 753
 754         mutex_lock(&phydev->lock);
 755         phydev->state = PHY_HALTED;
 756         mutex_unlock(&phydev->lock);
 757
 758         phy_trigger_machine(phydev);
 759 }
 760
 761 /**
 762  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 763  * @phydev: target phy_device struct
 764  */
 765 static int phy_disable_interrupts(struct phy_device *phydev)
 766 {
 767         int err;
 768
 769         /* Disable PHY interrupts */
 770         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 771         if (err)
 772                 return err;
 773
 774         /* Clear the interrupt */
 775         return phy_clear_interrupt(phydev);
 776 }
 777
 778 /**
 779  * phy_interrupt - PHY interrupt handler
 780  * @irq: interrupt line
 781  * @phy_dat: phy_device pointer
 782  *
 783  * Description: Handle PHY interrupt
 784  */
 785 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 786 {
 787         struct phy_device *phydev = phy_dat;
 788
 789         if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
 790                 return IRQ_NONE;
 791
 792         if (phydev->drv->handle_interrupt) {
 793                 if (phydev->drv->handle_interrupt(phydev))
 794                         goto phy_err;
 795         } else {
 796                 /* reschedule state queue work to run as soon as possible */
 797                 phy_trigger_machine(phydev);
 798         }
 799
 800         if (phy_clear_interrupt(phydev))
 801                 goto phy_err;
 802         return IRQ_HANDLED;
 803
 804 phy_err:
 805         phy_error(phydev);
 806         return IRQ_NONE;
 807 }
 808
 809 /**
 810  * phy_enable_interrupts - Enable the interrupts from the PHY side
 811  * @phydev: target phy_device struct
 812  */
 813 static int phy_enable_interrupts(struct phy_device *phydev)
 814 {
 815         int err = phy_clear_interrupt(phydev);
 816
 817         if (err < 0)
 818                 return err;
 819
 820         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 821 }
 822
 823 /**
 824  * phy_request_interrupt - request and enable interrupt for a PHY device
 825  * @phydev: target phy_device struct
 826  *
 827  * Description: Request and enable the interrupt for the given PHY.
 828  *   If this fails, then we set irq to PHY_POLL.
 829  *   This should only be called with a valid IRQ number.
 830  */
 831 void phy_request_interrupt(struct phy_device *phydev)
 832 {
 833         int err;
 834
 835         err = request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 836                                    IRQF_ONESHOT | IRQF_SHARED,
 837                                    phydev_name(phydev), phydev);
 838         if (err) {
 839                 phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
 840                             err, phydev->irq);
 841                 phydev->irq = PHY_POLL;
 842         } else {
 843                 if (phy_enable_interrupts(phydev)) {
 844                         phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
 845                         phy_free_interrupt(phydev);
 846                         phydev->irq = PHY_POLL;
 847                 }
 848         }
 849 }
 850 EXPORT_SYMBOL(phy_request_interrupt);
 851
 852 /**
 853  * phy_free_interrupt - disable and free interrupt for a PHY device
 854  * @phydev: target phy_device struct
 855  *
 856  * Description: Disable and free the interrupt for the given PHY.
 857  *   This should only be called with a valid IRQ number.
 858  */
 859 void phy_free_interrupt(struct phy_device *phydev)
 860 {
 861         phy_disable_interrupts(phydev);
 862         free_irq(phydev->irq, phydev);
 863 }
 864 EXPORT_SYMBOL(phy_free_interrupt);
 865
 866 /**
 867  * phy_stop - Bring down the PHY link, and stop checking the status
 868  * @phydev: target phy_device struct
 869  */
 870 void phy_stop(struct phy_device *phydev)
 871 {
 872         if (!phy_is_started(phydev)) {
 873                 WARN(1, "called from state %s\n",
 874                      phy_state_to_str(phydev->state));
 875                 return;
 876         }
 877
 878         mutex_lock(&phydev->lock);
 879
 880         phydev->state = PHY_HALTED;
 881
 882         mutex_unlock(&phydev->lock);
 883
 884         phy_state_machine(&phydev->state_queue.work);
 885         phy_stop_machine(phydev);
 886
 887         /* Cannot call flush_scheduled_work() here as desired because
 888          * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
 889          * will not reenable interrupts.
 890          */
 891 }
 892 EXPORT_SYMBOL(phy_stop);
 893
 894 /**
 895  * phy_start - start or restart a PHY device
 896  * @phydev: target phy_device struct
 897  *
 898  * Description: Indicates the attached device's readiness to
 899  *   handle PHY-related work.  Used during startup to start the
 900  *   PHY, and after a call to phy_stop() to resume operation.
 901  *   Also used to indicate the MDIO bus has cleared an error
 902  *   condition.
 903  */
 904 void phy_start(struct phy_device *phydev)
 905 {
 906         mutex_lock(&phydev->lock);
 907
 908         if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
 909                 WARN(1, "called from state %s\n",
 910                      phy_state_to_str(phydev->state));
 911                 goto out;
 912         }
 913
 914         /* if phy was suspended, bring the physical link up again */
 915         __phy_resume(phydev);
 916
 917         phydev->state = PHY_UP;
 918
 919         phy_start_machine(phydev);
 920 out:
 921         mutex_unlock(&phydev->lock);
 922 }
 923 EXPORT_SYMBOL(phy_start);
 924
 925 /**
 926  * phy_state_machine - Handle the state machine
 927  * @work: work_struct that describes the work to be done
 928  */
 929 void phy_state_machine(struct work_struct *work)
 930 {
 931         struct delayed_work *dwork = to_delayed_work(work);
 932         struct phy_device *phydev =
 933                         container_of(dwork, struct phy_device, state_queue);
 934         bool needs_aneg = false, do_suspend = false;
 935         enum phy_state old_state;
 936         int err = 0;
 937
 938         mutex_lock(&phydev->lock);
 939
 940         old_state = phydev->state;
 941
 942         switch (phydev->state) {
 943         case PHY_DOWN:
 944         case PHY_READY:
 945                 break;
 946         case PHY_UP:
 947                 needs_aneg = true;
 948
 949                 break;
 950         case PHY_NOLINK:
 951         case PHY_RUNNING:
 952                 err = phy_check_link_status(phydev);
 953                 break;
 954         case PHY_FORCING:
 955                 err = genphy_update_link(phydev);
 956                 if (err)
 957                         break;
 958
 959                 if (phydev->link) {
 960                         phydev->state = PHY_RUNNING;
 961                         phy_link_up(phydev);
 962                 } else {
 963                         if (0 == phydev->link_timeout--)
 964                                 needs_aneg = true;
 965                         phy_link_down(phydev, false);
 966                 }
 967                 break;
 968         case PHY_HALTED:
 969                 if (phydev->link) {
 970                         phydev->link = 0;
 971                         phy_link_down(phydev, true);
 972                         do_suspend = true;
 973                 }
 974                 break;
 975         }
 976
 977         mutex_unlock(&phydev->lock);
 978
 979         if (needs_aneg)
 980                 err = phy_start_aneg(phydev);
 981         else if (do_suspend)
 982                 phy_suspend(phydev);
 983
 984         if (err < 0)
 985                 phy_error(phydev);
 986
 987         if (old_state != phydev->state) {
 988                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
 989                            phy_state_to_str(old_state),
 990                            phy_state_to_str(phydev->state));
 991                 if (phydev->drv && phydev->drv->link_change_notify)
 992                         phydev->drv->link_change_notify(phydev);
 993         }
 994
 995         /* Only re-schedule a PHY state machine change if we are polling the
 996          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
 997          * between states from phy_mac_interrupt().
 998          *
 999          * In state PHY_HALTED the PHY gets suspended, so rescheduling the
1000          * state machine would be pointless and possibly error prone when
1001          * called from phy_disconnect() synchronously.
1002          */
1003         mutex_lock(&phydev->lock);
1004         if (phy_polling_mode(phydev) && phy_is_started(phydev))
1005                 phy_queue_state_machine(phydev, PHY_STATE_TIME);
1006         mutex_unlock(&phydev->lock);
1007 }
1008
1009 /**
1010  * phy_mac_interrupt - MAC says the link has changed
1011  * @phydev: phy_device struct with changed link
1012  *
1013  * The MAC layer is able to indicate there has been a change in the PHY link
1014  * status. Trigger the state machine and work a work queue.
1015  */
1016 void phy_mac_interrupt(struct phy_device *phydev)
1017 {
1018         /* Trigger a state machine change */
1019         phy_trigger_machine(phydev);
1020 }
1021 EXPORT_SYMBOL(phy_mac_interrupt);
1022
1023 static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
1024 {
1025         linkmode_zero(advertising);
1026
1027         if (eee_adv & MDIO_EEE_100TX)
1028                 linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
1029                                  advertising);
1030         if (eee_adv & MDIO_EEE_1000T)
1031                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
1032                                  advertising);
1033         if (eee_adv & MDIO_EEE_10GT)
1034                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
1035                                  advertising);
1036         if (eee_adv & MDIO_EEE_1000KX)
1037                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
1038                                  advertising);
1039         if (eee_adv & MDIO_EEE_10GKX4)
1040                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
1041                                  advertising);
1042         if (eee_adv & MDIO_EEE_10GKR)
1043                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
1044                                  advertising);
1045 }
1046
1047 /**
1048  * phy_init_eee - init and check the EEE feature
1049  * @phydev: target phy_device struct
1050  * @clk_stop_enable: PHY may stop the clock during LPI
1051  *
1052  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1053  * is supported by looking at the MMD registers 3.20 and 7.60/61
1054  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1055  * bit if required.
1056  */
1057 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1058 {
1059         if (!phydev->drv)
1060                 return -EIO;
1061
1062         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1063          */
1064         if (phydev->duplex == DUPLEX_FULL) {
1065                 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
1066                 __ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
1067                 __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
1068                 int eee_lp, eee_cap, eee_adv;
1069                 int status;
1070                 u32 cap;
1071
1072                 /* Read phy status to properly get the right settings */
1073                 status = phy_read_status(phydev);
1074                 if (status)
1075                         return status;
1076
1077                 /* First check if the EEE ability is supported */
1078                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1079                 if (eee_cap <= 0)
1080                         goto eee_exit_err;
1081
1082                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1083                 if (!cap)
1084                         goto eee_exit_err;
1085
1086                 /* Check which link settings negotiated and verify it in
1087                  * the EEE advertising registers.
1088                  */
1089                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1090                 if (eee_lp <= 0)
1091                         goto eee_exit_err;
1092
1093                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1094                 if (eee_adv <= 0)
1095                         goto eee_exit_err;
1096
1097                 mmd_eee_adv_to_linkmode(adv, eee_adv);
1098                 mmd_eee_adv_to_linkmode(lp, eee_lp);
1099                 linkmode_and(common, adv, lp);
1100
1101                 if (!phy_check_valid(phydev->speed, phydev->duplex, common))
1102                         goto eee_exit_err;
1103
1104                 if (clk_stop_enable)
1105                         /* Configure the PHY to stop receiving xMII
1106                          * clock while it is signaling LPI.
1107                          */
1108                         phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
1109                                          MDIO_PCS_CTRL1_CLKSTOP_EN);
1110
1111                 return 0; /* EEE supported */
1112         }
1113 eee_exit_err:
1114         return -EPROTONOSUPPORT;
1115 }
1116 EXPORT_SYMBOL(phy_init_eee);
1117
1118 /**
1119  * phy_get_eee_err - report the EEE wake error count
1120  * @phydev: target phy_device struct
1121  *
1122  * Description: it is to report the number of time where the PHY
1123  * failed to complete its normal wake sequence.
1124  */
1125 int phy_get_eee_err(struct phy_device *phydev)
1126 {
1127         if (!phydev->drv)
1128                 return -EIO;
1129
1130         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1131 }
1132 EXPORT_SYMBOL(phy_get_eee_err);
1133
1134 /**
1135  * phy_ethtool_get_eee - get EEE supported and status
1136  * @phydev: target phy_device struct
1137  * @data: ethtool_eee data
1138  *
1139  * Description: it reportes the Supported/Advertisement/LP Advertisement
1140  * capabilities.
1141  */
1142 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1143 {
1144         int val;
1145
1146         if (!phydev->drv)
1147                 return -EIO;
1148
1149         /* Get Supported EEE */
1150         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1151         if (val < 0)
1152                 return val;
1153         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1154
1155         /* Get advertisement EEE */
1156         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1157         if (val < 0)
1158                 return val;
1159         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1160         data->eee_enabled = !!data->advertised;
1161
1162         /* Get LP advertisement EEE */
1163         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1164         if (val < 0)
1165                 return val;
1166         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1167
1168         data->eee_active = !!(data->advertised & data->lp_advertised);
1169
1170         return 0;
1171 }
1172 EXPORT_SYMBOL(phy_ethtool_get_eee);
1173
1174 /**
1175  * phy_ethtool_set_eee - set EEE supported and status
1176  * @phydev: target phy_device struct
1177  * @data: ethtool_eee data
1178  *
1179  * Description: it is to program the Advertisement EEE register.
1180  */
1181 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1182 {
1183         int cap, old_adv, adv = 0, ret;
1184
1185         if (!phydev->drv)
1186                 return -EIO;
1187
1188         /* Get Supported EEE */
1189         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1190         if (cap < 0)
1191                 return cap;
1192
1193         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1194         if (old_adv < 0)
1195                 return old_adv;
1196
1197         if (data->eee_enabled) {
1198                 adv = !data->advertised ? cap :
1199                       ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1200                 /* Mask prohibited EEE modes */
1201                 adv &= ~phydev->eee_broken_modes;
1202         }
1203
1204         if (old_adv != adv) {
1205                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1206                 if (ret < 0)
1207                         return ret;
1208
1209                 /* Restart autonegotiation so the new modes get sent to the
1210                  * link partner.
1211                  */
1212                 ret = phy_restart_aneg(phydev);
1213                 if (ret < 0)
1214                         return ret;
1215         }
1216
1217         return 0;
1218 }
1219 EXPORT_SYMBOL(phy_ethtool_set_eee);
1220
1221 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1222 {
1223         if (phydev->drv && phydev->drv->set_wol)
1224                 return phydev->drv->set_wol(phydev, wol);
1225
1226         return -EOPNOTSUPP;
1227 }
1228 EXPORT_SYMBOL(phy_ethtool_set_wol);
1229
1230 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1231 {
1232         if (phydev->drv && phydev->drv->get_wol)
1233                 phydev->drv->get_wol(phydev, wol);
1234 }
1235 EXPORT_SYMBOL(phy_ethtool_get_wol);
1236
1237 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1238                                    struct ethtool_link_ksettings *cmd)
1239 {
1240         struct phy_device *phydev = ndev->phydev;
1241
1242         if (!phydev)
1243                 return -ENODEV;
1244
1245         phy_ethtool_ksettings_get(phydev, cmd);
1246
1247         return 0;
1248 }
1249 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1250
1251 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1252                                    const struct ethtool_link_ksettings *cmd)
1253 {
1254         struct phy_device *phydev = ndev->phydev;
1255
1256         if (!phydev)
1257                 return -ENODEV;
1258
1259         return phy_ethtool_ksettings_set(phydev, cmd);
1260 }
1261 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1262
1263 int phy_ethtool_nway_reset(struct net_device *ndev)
1264 {
1265         struct phy_device *phydev = ndev->phydev;
1266
1267         if (!phydev)
1268                 return -ENODEV;
1269
1270         if (!phydev->drv)
1271                 return -EIO;
1272
1273         return phy_restart_aneg(phydev);
1274 }
1275 EXPORT_SYMBOL(phy_ethtool_nway_reset);