drivers/net/phy/phy.c

   1 /* Framework for configuring and reading PHY devices
   2  * Based on code in sungem_phy.c and gianfar_phy.c
   3  *
   4  * Author: Andy Fleming
   5  *
   6  * Copyright (c) 2004 Freescale Semiconductor, Inc.
   7  * Copyright (c) 2006, 2007  Maciej W. Rozycki
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/errno.h>
  21 #include <linux/unistd.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/delay.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mii.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/phy.h>
  32 #include <linux/phy_led_triggers.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/mdio.h>
  35 #include <linux/io.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/atomic.h>
  38
  39 #include <asm/irq.h>
  40
  41 #define PHY_STATE_STR(_state)                   \
  42         case PHY_##_state:                      \
  43                 return __stringify(_state);     \
  44
  45 static const char *phy_state_to_str(enum phy_state st)
  46 {
  47         switch (st) {
  48         PHY_STATE_STR(DOWN)
  49         PHY_STATE_STR(STARTING)
  50         PHY_STATE_STR(READY)
  51         PHY_STATE_STR(PENDING)
  52         PHY_STATE_STR(UP)
  53         PHY_STATE_STR(AN)
  54         PHY_STATE_STR(RUNNING)
  55         PHY_STATE_STR(NOLINK)
  56         PHY_STATE_STR(FORCING)
  57         PHY_STATE_STR(CHANGELINK)
  58         PHY_STATE_STR(HALTED)
  59         PHY_STATE_STR(RESUMING)
  60         }
  61
  62         return NULL;
  63 }
  64
  65
  66 /**
  67  * phy_print_status - Convenience function to print out the current phy status
  68  * @phydev: the phy_device struct
  69  */
  70 void phy_print_status(struct phy_device *phydev)
  71 {
  72         if (phydev->link) {
  73                 netdev_info(phydev->attached_dev,
  74                         "Link is Up - %s/%s - flow control %s\n",
  75                         phy_speed_to_str(phydev->speed),
  76                         phy_duplex_to_str(phydev->duplex),
  77                         phydev->pause ? "rx/tx" : "off");
  78         } else  {
  79                 netdev_info(phydev->attached_dev, "Link is Down\n");
  80         }
  81 }
  82 EXPORT_SYMBOL(phy_print_status);
  83
  84 /**
  85  * phy_clear_interrupt - Ack the phy device's interrupt
  86  * @phydev: the phy_device struct
  87  *
  88  * If the @phydev driver has an ack_interrupt function, call it to
  89  * ack and clear the phy device's interrupt.
  90  *
  91  * Returns 0 on success or < 0 on error.
  92  */
  93 static int phy_clear_interrupt(struct phy_device *phydev)
  94 {
  95         if (phydev->drv->ack_interrupt)
  96                 return phydev->drv->ack_interrupt(phydev);
  97
  98         return 0;
  99 }
 100
 101 /**
 102  * phy_config_interrupt - configure the PHY device for the requested interrupts
 103  * @phydev: the phy_device struct
 104  * @interrupts: interrupt flags to configure for this @phydev
 105  *
 106  * Returns 0 on success or < 0 on error.
 107  */
 108 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 109 {
 110         phydev->interrupts = interrupts;
 111         if (phydev->drv->config_intr)
 112                 return phydev->drv->config_intr(phydev);
 113
 114         return 0;
 115 }
 116
 117 /**
 118  * phy_restart_aneg - restart auto-negotiation
 119  * @phydev: target phy_device struct
 120  *
 121  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
 122  * negative errno on error.
 123  */
 124 int phy_restart_aneg(struct phy_device *phydev)
 125 {
 126         int ret;
 127
 128         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 129                 ret = genphy_c45_restart_aneg(phydev);
 130         else
 131                 ret = genphy_restart_aneg(phydev);
 132
 133         return ret;
 134 }
 135 EXPORT_SYMBOL_GPL(phy_restart_aneg);
 136
 137 /**
 138  * phy_aneg_done - return auto-negotiation status
 139  * @phydev: target phy_device struct
 140  *
 141  * Description: Return the auto-negotiation status from this @phydev
 142  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 143  * is still pending.
 144  */
 145 int phy_aneg_done(struct phy_device *phydev)
 146 {
 147         if (phydev->drv && phydev->drv->aneg_done)
 148                 return phydev->drv->aneg_done(phydev);
 149
 150         /* Avoid genphy_aneg_done() if the Clause 45 PHY does not
 151          * implement Clause 22 registers
 152          */
 153         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 154                 return -EINVAL;
 155
 156         return genphy_aneg_done(phydev);
 157 }
 158 EXPORT_SYMBOL(phy_aneg_done);
 159
 160 /**
 161  * phy_find_valid - find a PHY setting that matches the requested parameters
 162  * @speed: desired speed
 163  * @duplex: desired duplex
 164  * @supported: mask of supported link modes
 165  *
 166  * Locate a supported phy setting that is, in priority order:
 167  * - an exact match for the specified speed and duplex mode
 168  * - a match for the specified speed, or slower speed
 169  * - the slowest supported speed
 170  * Returns the matched phy_setting entry, or %NULL if no supported phy
 171  * settings were found.
 172  */
 173 static const struct phy_setting *
 174 phy_find_valid(int speed, int duplex, u32 supported)
 175 {
 176         unsigned long mask = supported;
 177
 178         return phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, false);
 179 }
 180
 181 /**
 182  * phy_supported_speeds - return all speeds currently supported by a phy device
 183  * @phy: The phy device to return supported speeds of.
 184  * @speeds: buffer to store supported speeds in.
 185  * @size:   size of speeds buffer.
 186  *
 187  * Description: Returns the number of supported speeds, and fills the speeds
 188  * buffer with the supported speeds. If speeds buffer is too small to contain
 189  * all currently supported speeds, will return as many speeds as can fit.
 190  */
 191 unsigned int phy_supported_speeds(struct phy_device *phy,
 192                                   unsigned int *speeds,
 193                                   unsigned int size)
 194 {
 195         unsigned long supported = phy->supported;
 196
 197         return phy_speeds(speeds, size, &supported, BITS_PER_LONG);
 198 }
 199
 200 /**
 201  * phy_check_valid - check if there is a valid PHY setting which matches
 202  *                   speed, duplex, and feature mask
 203  * @speed: speed to match
 204  * @duplex: duplex to match
 205  * @features: A mask of the valid settings
 206  *
 207  * Description: Returns true if there is a valid setting, false otherwise.
 208  */
 209 static inline bool phy_check_valid(int speed, int duplex, u32 features)
 210 {
 211         unsigned long mask = features;
 212
 213         return !!phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, true);
 214 }
 215
 216 /**
 217  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 218  * @phydev: the target phy_device struct
 219  *
 220  * Description: Make sure the PHY is set to supported speeds and
 221  *   duplexes.  Drop down by one in this order:  1000/FULL,
 222  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 223  */
 224 static void phy_sanitize_settings(struct phy_device *phydev)
 225 {
 226         const struct phy_setting *setting;
 227         u32 features = phydev->supported;
 228
 229         /* Sanitize settings based on PHY capabilities */
 230         if ((features & SUPPORTED_Autoneg) == 0)
 231                 phydev->autoneg = AUTONEG_DISABLE;
 232
 233         setting = phy_find_valid(phydev->speed, phydev->duplex, features);
 234         if (setting) {
 235                 phydev->speed = setting->speed;
 236                 phydev->duplex = setting->duplex;
 237         } else {
 238                 /* We failed to find anything (no supported speeds?) */
 239                 phydev->speed = SPEED_UNKNOWN;
 240                 phydev->duplex = DUPLEX_UNKNOWN;
 241         }
 242 }
 243
 244 /**
 245  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 246  * @phydev: target phy_device struct
 247  * @cmd: ethtool_cmd
 248  *
 249  * A few notes about parameter checking:
 250  *
 251  * - We don't set port or transceiver, so we don't care what they
 252  *   were set to.
 253  * - phy_start_aneg() will make sure forced settings are sane, and
 254  *   choose the next best ones from the ones selected, so we don't
 255  *   care if ethtool tries to give us bad values.
 256  */
 257 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 258 {
 259         u32 speed = ethtool_cmd_speed(cmd);
 260
 261         if (cmd->phy_address != phydev->mdio.addr)
 262                 return -EINVAL;
 263
 264         /* We make sure that we don't pass unsupported values in to the PHY */
 265         cmd->advertising &= phydev->supported;
 266
 267         /* Verify the settings we care about. */
 268         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 269                 return -EINVAL;
 270
 271         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 272                 return -EINVAL;
 273
 274         if (cmd->autoneg == AUTONEG_DISABLE &&
 275             ((speed != SPEED_1000 &&
 276               speed != SPEED_100 &&
 277               speed != SPEED_10) ||
 278              (cmd->duplex != DUPLEX_HALF &&
 279               cmd->duplex != DUPLEX_FULL)))
 280                 return -EINVAL;
 281
 282         phydev->autoneg = cmd->autoneg;
 283
 284         phydev->speed = speed;
 285
 286         phydev->advertising = cmd->advertising;
 287
 288         if (AUTONEG_ENABLE == cmd->autoneg)
 289                 phydev->advertising |= ADVERTISED_Autoneg;
 290         else
 291                 phydev->advertising &= ~ADVERTISED_Autoneg;
 292
 293         phydev->duplex = cmd->duplex;
 294
 295         phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
 296
 297         /* Restart the PHY */
 298         phy_start_aneg(phydev);
 299
 300         return 0;
 301 }
 302 EXPORT_SYMBOL(phy_ethtool_sset);
 303
 304 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 305                               const struct ethtool_link_ksettings *cmd)
 306 {
 307         u8 autoneg = cmd->base.autoneg;
 308         u8 duplex = cmd->base.duplex;
 309         u32 speed = cmd->base.speed;
 310         u32 advertising;
 311
 312         if (cmd->base.phy_address != phydev->mdio.addr)
 313                 return -EINVAL;
 314
 315         ethtool_convert_link_mode_to_legacy_u32(&advertising,
 316                                                 cmd->link_modes.advertising);
 317
 318         /* We make sure that we don't pass unsupported values in to the PHY */
 319         advertising &= phydev->supported;
 320
 321         /* Verify the settings we care about. */
 322         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 323                 return -EINVAL;
 324
 325         if (autoneg == AUTONEG_ENABLE && advertising == 0)
 326                 return -EINVAL;
 327
 328         if (autoneg == AUTONEG_DISABLE &&
 329             ((speed != SPEED_1000 &&
 330               speed != SPEED_100 &&
 331               speed != SPEED_10) ||
 332              (duplex != DUPLEX_HALF &&
 333               duplex != DUPLEX_FULL)))
 334                 return -EINVAL;
 335
 336         phydev->autoneg = autoneg;
 337
 338         phydev->speed = speed;
 339
 340         phydev->advertising = advertising;
 341
 342         if (autoneg == AUTONEG_ENABLE)
 343                 phydev->advertising |= ADVERTISED_Autoneg;
 344         else
 345                 phydev->advertising &= ~ADVERTISED_Autoneg;
 346
 347         phydev->duplex = duplex;
 348
 349         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 350
 351         /* Restart the PHY */
 352         phy_start_aneg(phydev);
 353
 354         return 0;
 355 }
 356 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 357
 358 void phy_ethtool_ksettings_get(struct phy_device *phydev,
 359                                struct ethtool_link_ksettings *cmd)
 360 {
 361         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 362                                                 phydev->supported);
 363
 364         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 365                                                 phydev->advertising);
 366
 367         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
 368                                                 phydev->lp_advertising);
 369
 370         cmd->base.speed = phydev->speed;
 371         cmd->base.duplex = phydev->duplex;
 372         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 373                 cmd->base.port = PORT_BNC;
 374         else
 375                 cmd->base.port = PORT_MII;
 376         cmd->base.transceiver = phy_is_internal(phydev) ?
 377                                 XCVR_INTERNAL : XCVR_EXTERNAL;
 378         cmd->base.phy_address = phydev->mdio.addr;
 379         cmd->base.autoneg = phydev->autoneg;
 380         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 381         cmd->base.eth_tp_mdix = phydev->mdix;
 382 }
 383 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 384
 385 /**
 386  * phy_mii_ioctl - generic PHY MII ioctl interface
 387  * @phydev: the phy_device struct
 388  * @ifr: &struct ifreq for socket ioctl's
 389  * @cmd: ioctl cmd to execute
 390  *
 391  * Note that this function is currently incompatible with the
 392  * PHYCONTROL layer.  It changes registers without regard to
 393  * current state.  Use at own risk.
 394  */
 395 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 396 {
 397         struct mii_ioctl_data *mii_data = if_mii(ifr);
 398         u16 val = mii_data->val_in;
 399         bool change_autoneg = false;
 400
 401         switch (cmd) {
 402         case SIOCGMIIPHY:
 403                 mii_data->phy_id = phydev->mdio.addr;
 404                 /* fall through */
 405
 406         case SIOCGMIIREG:
 407                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 408                                                  mii_data->phy_id,
 409                                                  mii_data->reg_num);
 410                 return 0;
 411
 412         case SIOCSMIIREG:
 413                 if (mii_data->phy_id == phydev->mdio.addr) {
 414                         switch (mii_data->reg_num) {
 415                         case MII_BMCR:
 416                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 417                                         if (phydev->autoneg == AUTONEG_ENABLE)
 418                                                 change_autoneg = true;
 419                                         phydev->autoneg = AUTONEG_DISABLE;
 420                                         if (val & BMCR_FULLDPLX)
 421                                                 phydev->duplex = DUPLEX_FULL;
 422                                         else
 423                                                 phydev->duplex = DUPLEX_HALF;
 424                                         if (val & BMCR_SPEED1000)
 425                                                 phydev->speed = SPEED_1000;
 426                                         else if (val & BMCR_SPEED100)
 427                                                 phydev->speed = SPEED_100;
 428                                         else phydev->speed = SPEED_10;
 429                                 }
 430                                 else {
 431                                         if (phydev->autoneg == AUTONEG_DISABLE)
 432                                                 change_autoneg = true;
 433                                         phydev->autoneg = AUTONEG_ENABLE;
 434                                 }
 435                                 break;
 436                         case MII_ADVERTISE:
 437                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 438                                 change_autoneg = true;
 439                                 break;
 440                         default:
 441                                 /* do nothing */
 442                                 break;
 443                         }
 444                 }
 445
 446                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 447                               mii_data->reg_num, val);
 448
 449                 if (mii_data->phy_id == phydev->mdio.addr &&
 450                     mii_data->reg_num == MII_BMCR &&
 451                     val & BMCR_RESET)
 452                         return phy_init_hw(phydev);
 453
 454                 if (change_autoneg)
 455                         return phy_start_aneg(phydev);
 456
 457                 return 0;
 458
 459         case SIOCSHWTSTAMP:
 460                 if (phydev->drv && phydev->drv->hwtstamp)
 461                         return phydev->drv->hwtstamp(phydev, ifr);
 462                 /* fall through */
 463
 464         default:
 465                 return -EOPNOTSUPP;
 466         }
 467 }
 468 EXPORT_SYMBOL(phy_mii_ioctl);
 469
 470 static int phy_config_aneg(struct phy_device *phydev)
 471 {
 472         if (phydev->drv->config_aneg)
 473                 return phydev->drv->config_aneg(phydev);
 474
 475         /* Clause 45 PHYs that don't implement Clause 22 registers are not
 476          * allowed to call genphy_config_aneg()
 477          */
 478         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 479                 return -EOPNOTSUPP;
 480
 481         return genphy_config_aneg(phydev);
 482 }
 483
 484 /**
 485  * phy_start_aneg_priv - start auto-negotiation for this PHY device
 486  * @phydev: the phy_device struct
 487  * @sync: indicate whether we should wait for the workqueue cancelation
 488  *
 489  * Description: Sanitizes the settings (if we're not autonegotiating
 490  *   them), and then calls the driver's config_aneg function.
 491  *   If the PHYCONTROL Layer is operating, we change the state to
 492  *   reflect the beginning of Auto-negotiation or forcing.
 493  */
 494 static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 495 {
 496         bool trigger = 0;
 497         int err;
 498
 499         if (!phydev->drv)
 500                 return -EIO;
 501
 502         mutex_lock(&phydev->lock);
 503
 504         if (AUTONEG_DISABLE == phydev->autoneg)
 505                 phy_sanitize_settings(phydev);
 506
 507         /* Invalidate LP advertising flags */
 508         phydev->lp_advertising = 0;
 509
 510         err = phy_config_aneg(phydev);
 511         if (err < 0)
 512                 goto out_unlock;
 513
 514         if (phydev->state != PHY_HALTED) {
 515                 if (AUTONEG_ENABLE == phydev->autoneg) {
 516                         phydev->state = PHY_AN;
 517                         phydev->link_timeout = PHY_AN_TIMEOUT;
 518                 } else {
 519                         phydev->state = PHY_FORCING;
 520                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 521                 }
 522         }
 523
 524         /* Re-schedule a PHY state machine to check PHY status because
 525          * negotiation may already be done and aneg interrupt may not be
 526          * generated.
 527          */
 528         if (!phy_polling_mode(phydev) && phydev->state == PHY_AN) {
 529                 err = phy_aneg_done(phydev);
 530                 if (err > 0) {
 531                         trigger = true;
 532                         err = 0;
 533                 }
 534         }
 535
 536 out_unlock:
 537         mutex_unlock(&phydev->lock);
 538
 539         if (trigger)
 540                 phy_trigger_machine(phydev);
 541
 542         return err;
 543 }
 544
 545 /**
 546  * phy_start_aneg - start auto-negotiation for this PHY device
 547  * @phydev: the phy_device struct
 548  *
 549  * Description: Sanitizes the settings (if we're not autonegotiating
 550  *   them), and then calls the driver's config_aneg function.
 551  *   If the PHYCONTROL Layer is operating, we change the state to
 552  *   reflect the beginning of Auto-negotiation or forcing.
 553  */
 554 int phy_start_aneg(struct phy_device *phydev)
 555 {
 556         return phy_start_aneg_priv(phydev, true);
 557 }
 558 EXPORT_SYMBOL(phy_start_aneg);
 559
 560 static int phy_poll_aneg_done(struct phy_device *phydev)
 561 {
 562         unsigned int retries = 100;
 563         int ret;
 564
 565         do {
 566                 msleep(100);
 567                 ret = phy_aneg_done(phydev);
 568         } while (!ret && --retries);
 569
 570         if (!ret)
 571                 return -ETIMEDOUT;
 572
 573         return ret < 0 ? ret : 0;
 574 }
 575
 576 /**
 577  * phy_speed_down - set speed to lowest speed supported by both link partners
 578  * @phydev: the phy_device struct
 579  * @sync: perform action synchronously
 580  *
 581  * Description: Typically used to save energy when waiting for a WoL packet
 582  *
 583  * WARNING: Setting sync to false may cause the system being unable to suspend
 584  * in case the PHY generates an interrupt when finishing the autonegotiation.
 585  * This interrupt may wake up the system immediately after suspend.
 586  * Therefore use sync = false only if you're sure it's safe with the respective
 587  * network chip.
 588  */
 589 int phy_speed_down(struct phy_device *phydev, bool sync)
 590 {
 591         u32 adv = phydev->lp_advertising & phydev->supported;
 592         u32 adv_old = phydev->advertising;
 593         int ret;
 594
 595         if (phydev->autoneg != AUTONEG_ENABLE)
 596                 return 0;
 597
 598         if (adv & PHY_10BT_FEATURES)
 599                 phydev->advertising &= ~(PHY_100BT_FEATURES |
 600                                          PHY_1000BT_FEATURES);
 601         else if (adv & PHY_100BT_FEATURES)
 602                 phydev->advertising &= ~PHY_1000BT_FEATURES;
 603
 604         if (phydev->advertising == adv_old)
 605                 return 0;
 606
 607         ret = phy_config_aneg(phydev);
 608         if (ret)
 609                 return ret;
 610
 611         return sync ? phy_poll_aneg_done(phydev) : 0;
 612 }
 613 EXPORT_SYMBOL_GPL(phy_speed_down);
 614
 615 /**
 616  * phy_speed_up - (re)set advertised speeds to all supported speeds
 617  * @phydev: the phy_device struct
 618  *
 619  * Description: Used to revert the effect of phy_speed_down
 620  */
 621 int phy_speed_up(struct phy_device *phydev)
 622 {
 623         u32 mask = PHY_10BT_FEATURES | PHY_100BT_FEATURES | PHY_1000BT_FEATURES;
 624         u32 adv_old = phydev->advertising;
 625
 626         if (phydev->autoneg != AUTONEG_ENABLE)
 627                 return 0;
 628
 629         phydev->advertising = (adv_old & ~mask) | (phydev->supported & mask);
 630
 631         if (phydev->advertising == adv_old)
 632                 return 0;
 633
 634         return phy_config_aneg(phydev);
 635 }
 636 EXPORT_SYMBOL_GPL(phy_speed_up);
 637
 638 static void phy_queue_state_machine(struct phy_device *phydev,
 639                                     unsigned int secs)
 640 {
 641         mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
 642                          secs * HZ);
 643 }
 644
 645 /**
 646  * phy_start_machine - start PHY state machine tracking
 647  * @phydev: the phy_device struct
 648  *
 649  * Description: The PHY infrastructure can run a state machine
 650  *   which tracks whether the PHY is starting up, negotiating,
 651  *   etc.  This function starts the delayed workqueue which tracks
 652  *   the state of the PHY. If you want to maintain your own state machine,
 653  *   do not call this function.
 654  */
 655 void phy_start_machine(struct phy_device *phydev)
 656 {
 657         phy_queue_state_machine(phydev, 1);
 658 }
 659 EXPORT_SYMBOL_GPL(phy_start_machine);
 660
 661 /**
 662  * phy_trigger_machine - trigger the state machine to run
 663  *
 664  * @phydev: the phy_device struct
 665  *
 666  * Description: There has been a change in state which requires that the
 667  *   state machine runs.
 668  */
 669
 670 void phy_trigger_machine(struct phy_device *phydev)
 671 {
 672         phy_queue_state_machine(phydev, 0);
 673 }
 674
 675 /**
 676  * phy_stop_machine - stop the PHY state machine tracking
 677  * @phydev: target phy_device struct
 678  *
 679  * Description: Stops the state machine delayed workqueue, sets the
 680  *   state to UP (unless it wasn't up yet). This function must be
 681  *   called BEFORE phy_detach.
 682  */
 683 void phy_stop_machine(struct phy_device *phydev)
 684 {
 685         cancel_delayed_work_sync(&phydev->state_queue);
 686
 687         mutex_lock(&phydev->lock);
 688         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 689                 phydev->state = PHY_UP;
 690         mutex_unlock(&phydev->lock);
 691 }
 692
 693 /**
 694  * phy_error - enter HALTED state for this PHY device
 695  * @phydev: target phy_device struct
 696  *
 697  * Moves the PHY to the HALTED state in response to a read
 698  * or write error, and tells the controller the link is down.
 699  * Must not be called from interrupt context, or while the
 700  * phydev->lock is held.
 701  */
 702 static void phy_error(struct phy_device *phydev)
 703 {
 704         mutex_lock(&phydev->lock);
 705         phydev->state = PHY_HALTED;
 706         mutex_unlock(&phydev->lock);
 707
 708         phy_trigger_machine(phydev);
 709 }
 710
 711 /**
 712  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 713  * @phydev: target phy_device struct
 714  */
 715 static int phy_disable_interrupts(struct phy_device *phydev)
 716 {
 717         int err;
 718
 719         /* Disable PHY interrupts */
 720         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 721         if (err)
 722                 return err;
 723
 724         /* Clear the interrupt */
 725         return phy_clear_interrupt(phydev);
 726 }
 727
 728 /**
 729  * phy_change - Called by the phy_interrupt to handle PHY changes
 730  * @phydev: phy_device struct that interrupted
 731  */
 732 static irqreturn_t phy_change(struct phy_device *phydev)
 733 {
 734         if (phy_interrupt_is_valid(phydev)) {
 735                 if (phydev->drv->did_interrupt &&
 736                     !phydev->drv->did_interrupt(phydev))
 737                         return IRQ_NONE;
 738
 739                 if (phydev->state == PHY_HALTED)
 740                         if (phy_disable_interrupts(phydev))
 741                                 goto phy_err;
 742         }
 743
 744         mutex_lock(&phydev->lock);
 745         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 746                 phydev->state = PHY_CHANGELINK;
 747         mutex_unlock(&phydev->lock);
 748
 749         /* reschedule state queue work to run as soon as possible */
 750         phy_trigger_machine(phydev);
 751
 752         if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
 753                 goto phy_err;
 754         return IRQ_HANDLED;
 755
 756 phy_err:
 757         phy_error(phydev);
 758         return IRQ_NONE;
 759 }
 760
 761 /**
 762  * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
 763  * @work: work_struct that describes the work to be done
 764  */
 765 void phy_change_work(struct work_struct *work)
 766 {
 767         struct phy_device *phydev =
 768                 container_of(work, struct phy_device, phy_queue);
 769
 770         phy_change(phydev);
 771 }
 772
 773 /**
 774  * phy_interrupt - PHY interrupt handler
 775  * @irq: interrupt line
 776  * @phy_dat: phy_device pointer
 777  *
 778  * Description: When a PHY interrupt occurs, the handler disables
 779  * interrupts, and uses phy_change to handle the interrupt.
 780  */
 781 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 782 {
 783         struct phy_device *phydev = phy_dat;
 784
 785         if (PHY_HALTED == phydev->state)
 786                 return IRQ_NONE;                /* It can't be ours.  */
 787
 788         return phy_change(phydev);
 789 }
 790
 791 /**
 792  * phy_enable_interrupts - Enable the interrupts from the PHY side
 793  * @phydev: target phy_device struct
 794  */
 795 static int phy_enable_interrupts(struct phy_device *phydev)
 796 {
 797         int err = phy_clear_interrupt(phydev);
 798
 799         if (err < 0)
 800                 return err;
 801
 802         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 803 }
 804
 805 /**
 806  * phy_start_interrupts - request and enable interrupts for a PHY device
 807  * @phydev: target phy_device struct
 808  *
 809  * Description: Request the interrupt for the given PHY.
 810  *   If this fails, then we set irq to PHY_POLL.
 811  *   Otherwise, we enable the interrupts in the PHY.
 812  *   This should only be called with a valid IRQ number.
 813  *   Returns 0 on success or < 0 on error.
 814  */
 815 int phy_start_interrupts(struct phy_device *phydev)
 816 {
 817         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 818                                  IRQF_ONESHOT | IRQF_SHARED,
 819                                  phydev_name(phydev), phydev) < 0) {
 820                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 821                         phydev->mdio.bus->name, phydev->irq);
 822                 phydev->irq = PHY_POLL;
 823                 return 0;
 824         }
 825
 826         return phy_enable_interrupts(phydev);
 827 }
 828 EXPORT_SYMBOL(phy_start_interrupts);
 829
 830 /**
 831  * phy_stop_interrupts - disable interrupts from a PHY device
 832  * @phydev: target phy_device struct
 833  */
 834 int phy_stop_interrupts(struct phy_device *phydev)
 835 {
 836         int err = phy_disable_interrupts(phydev);
 837
 838         if (err)
 839                 phy_error(phydev);
 840
 841         free_irq(phydev->irq, phydev);
 842
 843         return err;
 844 }
 845 EXPORT_SYMBOL(phy_stop_interrupts);
 846
 847 /**
 848  * phy_stop - Bring down the PHY link, and stop checking the status
 849  * @phydev: target phy_device struct
 850  */
 851 void phy_stop(struct phy_device *phydev)
 852 {
 853         mutex_lock(&phydev->lock);
 854
 855         if (PHY_HALTED == phydev->state)
 856                 goto out_unlock;
 857
 858         if (phy_interrupt_is_valid(phydev))
 859                 phy_disable_interrupts(phydev);
 860
 861         phydev->state = PHY_HALTED;
 862
 863 out_unlock:
 864         mutex_unlock(&phydev->lock);
 865
 866         phy_state_machine(&phydev->state_queue.work);
 867
 868         /* Cannot call flush_scheduled_work() here as desired because
 869          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 870          * will not reenable interrupts.
 871          */
 872 }
 873 EXPORT_SYMBOL(phy_stop);
 874
 875 /**
 876  * phy_start - start or restart a PHY device
 877  * @phydev: target phy_device struct
 878  *
 879  * Description: Indicates the attached device's readiness to
 880  *   handle PHY-related work.  Used during startup to start the
 881  *   PHY, and after a call to phy_stop() to resume operation.
 882  *   Also used to indicate the MDIO bus has cleared an error
 883  *   condition.
 884  */
 885 void phy_start(struct phy_device *phydev)
 886 {
 887         int err = 0;
 888
 889         mutex_lock(&phydev->lock);
 890
 891         switch (phydev->state) {
 892         case PHY_STARTING:
 893                 phydev->state = PHY_PENDING;
 894                 break;
 895         case PHY_READY:
 896                 phydev->state = PHY_UP;
 897                 break;
 898         case PHY_HALTED:
 899                 /* if phy was suspended, bring the physical link up again */
 900                 __phy_resume(phydev);
 901
 902                 /* make sure interrupts are re-enabled for the PHY */
 903                 if (phy_interrupt_is_valid(phydev)) {
 904                         err = phy_enable_interrupts(phydev);
 905                         if (err < 0)
 906                                 break;
 907                 }
 908
 909                 phydev->state = PHY_RESUMING;
 910                 break;
 911         default:
 912                 break;
 913         }
 914         mutex_unlock(&phydev->lock);
 915
 916         phy_trigger_machine(phydev);
 917 }
 918 EXPORT_SYMBOL(phy_start);
 919
 920 static void phy_link_up(struct phy_device *phydev)
 921 {
 922         phydev->phy_link_change(phydev, true, true);
 923         phy_led_trigger_change_speed(phydev);
 924 }
 925
 926 static void phy_link_down(struct phy_device *phydev, bool do_carrier)
 927 {
 928         phydev->phy_link_change(phydev, false, do_carrier);
 929         phy_led_trigger_change_speed(phydev);
 930 }
 931
 932 /**
 933  * phy_state_machine - Handle the state machine
 934  * @work: work_struct that describes the work to be done
 935  */
 936 void phy_state_machine(struct work_struct *work)
 937 {
 938         struct delayed_work *dwork = to_delayed_work(work);
 939         struct phy_device *phydev =
 940                         container_of(dwork, struct phy_device, state_queue);
 941         bool needs_aneg = false, do_suspend = false;
 942         enum phy_state old_state;
 943         int err = 0;
 944         int old_link;
 945
 946         mutex_lock(&phydev->lock);
 947
 948         old_state = phydev->state;
 949
 950         if (phydev->drv && phydev->drv->link_change_notify)
 951                 phydev->drv->link_change_notify(phydev);
 952
 953         switch (phydev->state) {
 954         case PHY_DOWN:
 955         case PHY_STARTING:
 956         case PHY_READY:
 957         case PHY_PENDING:
 958                 break;
 959         case PHY_UP:
 960                 needs_aneg = true;
 961
 962                 phydev->link_timeout = PHY_AN_TIMEOUT;
 963
 964                 break;
 965         case PHY_AN:
 966                 err = phy_read_status(phydev);
 967                 if (err < 0)
 968                         break;
 969
 970                 /* If the link is down, give up on negotiation for now */
 971                 if (!phydev->link) {
 972                         phydev->state = PHY_NOLINK;
 973                         phy_link_down(phydev, true);
 974                         break;
 975                 }
 976
 977                 /* Check if negotiation is done.  Break if there's an error */
 978                 err = phy_aneg_done(phydev);
 979                 if (err < 0)
 980                         break;
 981
 982                 /* If AN is done, we're running */
 983                 if (err > 0) {
 984                         phydev->state = PHY_RUNNING;
 985                         phy_link_up(phydev);
 986                 } else if (0 == phydev->link_timeout--)
 987                         needs_aneg = true;
 988                 break;
 989         case PHY_NOLINK:
 990                 if (!phy_polling_mode(phydev))
 991                         break;
 992
 993                 err = phy_read_status(phydev);
 994                 if (err)
 995                         break;
 996
 997                 if (phydev->link) {
 998                         if (AUTONEG_ENABLE == phydev->autoneg) {
 999                                 err = phy_aneg_done(phydev);
1000                                 if (err < 0)
1001                                         break;
1002
1003                                 if (!err) {
1004                                         phydev->state = PHY_AN;
1005                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1006                                         break;
1007                                 }
1008                         }
1009                         phydev->state = PHY_RUNNING;
1010                         phy_link_up(phydev);
1011                 }
1012                 break;
1013         case PHY_FORCING:
1014                 err = genphy_update_link(phydev);
1015                 if (err)
1016                         break;
1017
1018                 if (phydev->link) {
1019                         phydev->state = PHY_RUNNING;
1020                         phy_link_up(phydev);
1021                 } else {
1022                         if (0 == phydev->link_timeout--)
1023                                 needs_aneg = true;
1024                         phy_link_down(phydev, false);
1025                 }
1026                 break;
1027         case PHY_RUNNING:
1028                 /* Only register a CHANGE if we are polling and link changed
1029                  * since latest checking.
1030                  */
1031                 if (phy_polling_mode(phydev)) {
1032                         old_link = phydev->link;
1033                         err = phy_read_status(phydev);
1034                         if (err)
1035                                 break;
1036
1037                         if (old_link != phydev->link)
1038                                 phydev->state = PHY_CHANGELINK;
1039                 }
1040                 /*
1041                  * Failsafe: check that nobody set phydev->link=0 between two
1042                  * poll cycles, otherwise we won't leave RUNNING state as long
1043                  * as link remains down.
1044                  */
1045                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1046                         phydev->state = PHY_CHANGELINK;
1047                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1048                 }
1049                 break;
1050         case PHY_CHANGELINK:
1051                 err = phy_read_status(phydev);
1052                 if (err)
1053                         break;
1054
1055                 if (phydev->link) {
1056                         phydev->state = PHY_RUNNING;
1057                         phy_link_up(phydev);
1058                 } else {
1059                         phydev->state = PHY_NOLINK;
1060                         phy_link_down(phydev, true);
1061                 }
1062                 break;
1063         case PHY_HALTED:
1064                 if (phydev->link) {
1065                         phydev->link = 0;
1066                         phy_link_down(phydev, true);
1067                         do_suspend = true;
1068                 }
1069                 break;
1070         case PHY_RESUMING:
1071                 if (AUTONEG_ENABLE == phydev->autoneg) {
1072                         err = phy_aneg_done(phydev);
1073                         if (err < 0)
1074                                 break;
1075
1076                         /* err > 0 if AN is done.
1077                          * Otherwise, it's 0, and we're  still waiting for AN
1078                          */
1079                         if (err > 0) {
1080                                 err = phy_read_status(phydev);
1081                                 if (err)
1082                                         break;
1083
1084                                 if (phydev->link) {
1085                                         phydev->state = PHY_RUNNING;
1086                                         phy_link_up(phydev);
1087                                 } else  {
1088                                         phydev->state = PHY_NOLINK;
1089                                         phy_link_down(phydev, false);
1090                                 }
1091                         } else {
1092                                 phydev->state = PHY_AN;
1093                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1094                         }
1095                 } else {
1096                         err = phy_read_status(phydev);
1097                         if (err)
1098                                 break;
1099
1100                         if (phydev->link) {
1101                                 phydev->state = PHY_RUNNING;
1102                                 phy_link_up(phydev);
1103                         } else  {
1104                                 phydev->state = PHY_NOLINK;
1105                                 phy_link_down(phydev, false);
1106                         }
1107                 }
1108                 break;
1109         }
1110
1111         mutex_unlock(&phydev->lock);
1112
1113         if (needs_aneg)
1114                 err = phy_start_aneg_priv(phydev, false);
1115         else if (do_suspend)
1116                 phy_suspend(phydev);
1117
1118         if (err < 0)
1119                 phy_error(phydev);
1120
1121         if (old_state != phydev->state)
1122                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
1123                            phy_state_to_str(old_state),
1124                            phy_state_to_str(phydev->state));
1125
1126         /* Only re-schedule a PHY state machine change if we are polling the
1127          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1128          * between states from phy_mac_interrupt().
1129          *
1130          * In state PHY_HALTED the PHY gets suspended, so rescheduling the
1131          * state machine would be pointless and possibly error prone when
1132          * called from phy_disconnect() synchronously.
1133          */
1134         if (phy_polling_mode(phydev) && old_state != PHY_HALTED)
1135                 phy_queue_state_machine(phydev, PHY_STATE_TIME);
1136 }
1137
1138 /**
1139  * phy_mac_interrupt - MAC says the link has changed
1140  * @phydev: phy_device struct with changed link
1141  *
1142  * The MAC layer is able to indicate there has been a change in the PHY link
1143  * status. Trigger the state machine and work a work queue.
1144  */
1145 void phy_mac_interrupt(struct phy_device *phydev)
1146 {
1147         /* Trigger a state machine change */
1148         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1149 }
1150 EXPORT_SYMBOL(phy_mac_interrupt);
1151
1152 /**
1153  * phy_init_eee - init and check the EEE feature
1154  * @phydev: target phy_device struct
1155  * @clk_stop_enable: PHY may stop the clock during LPI
1156  *
1157  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1158  * is supported by looking at the MMD registers 3.20 and 7.60/61
1159  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1160  * bit if required.
1161  */
1162 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1163 {
1164         if (!phydev->drv)
1165                 return -EIO;
1166
1167         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1168          */
1169         if (phydev->duplex == DUPLEX_FULL) {
1170                 int eee_lp, eee_cap, eee_adv;
1171                 u32 lp, cap, adv;
1172                 int status;
1173
1174                 /* Read phy status to properly get the right settings */
1175                 status = phy_read_status(phydev);
1176                 if (status)
1177                         return status;
1178
1179                 /* First check if the EEE ability is supported */
1180                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1181                 if (eee_cap <= 0)
1182                         goto eee_exit_err;
1183
1184                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1185                 if (!cap)
1186                         goto eee_exit_err;
1187
1188                 /* Check which link settings negotiated and verify it in
1189                  * the EEE advertising registers.
1190                  */
1191                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1192                 if (eee_lp <= 0)
1193                         goto eee_exit_err;
1194
1195                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1196                 if (eee_adv <= 0)
1197                         goto eee_exit_err;
1198
1199                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1200                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1201                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1202                         goto eee_exit_err;
1203
1204                 if (clk_stop_enable) {
1205                         /* Configure the PHY to stop receiving xMII
1206                          * clock while it is signaling LPI.
1207                          */
1208                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1209                         if (val < 0)
1210                                 return val;
1211
1212                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1213                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1214                 }
1215
1216                 return 0; /* EEE supported */
1217         }
1218 eee_exit_err:
1219         return -EPROTONOSUPPORT;
1220 }
1221 EXPORT_SYMBOL(phy_init_eee);
1222
1223 /**
1224  * phy_get_eee_err - report the EEE wake error count
1225  * @phydev: target phy_device struct
1226  *
1227  * Description: it is to report the number of time where the PHY
1228  * failed to complete its normal wake sequence.
1229  */
1230 int phy_get_eee_err(struct phy_device *phydev)
1231 {
1232         if (!phydev->drv)
1233                 return -EIO;
1234
1235         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1236 }
1237 EXPORT_SYMBOL(phy_get_eee_err);
1238
1239 /**
1240  * phy_ethtool_get_eee - get EEE supported and status
1241  * @phydev: target phy_device struct
1242  * @data: ethtool_eee data
1243  *
1244  * Description: it reportes the Supported/Advertisement/LP Advertisement
1245  * capabilities.
1246  */
1247 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1248 {
1249         int val;
1250
1251         if (!phydev->drv)
1252                 return -EIO;
1253
1254         /* Get Supported EEE */
1255         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1256         if (val < 0)
1257                 return val;
1258         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1259
1260         /* Get advertisement EEE */
1261         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1262         if (val < 0)
1263                 return val;
1264         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1265
1266         /* Get LP advertisement EEE */
1267         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1268         if (val < 0)
1269                 return val;
1270         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1271
1272         return 0;
1273 }
1274 EXPORT_SYMBOL(phy_ethtool_get_eee);
1275
1276 /**
1277  * phy_ethtool_set_eee - set EEE supported and status
1278  * @phydev: target phy_device struct
1279  * @data: ethtool_eee data
1280  *
1281  * Description: it is to program the Advertisement EEE register.
1282  */
1283 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1284 {
1285         int cap, old_adv, adv, ret;
1286
1287         if (!phydev->drv)
1288                 return -EIO;
1289
1290         /* Get Supported EEE */
1291         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1292         if (cap < 0)
1293                 return cap;
1294
1295         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1296         if (old_adv < 0)
1297                 return old_adv;
1298
1299         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1300
1301         /* Mask prohibited EEE modes */
1302         adv &= ~phydev->eee_broken_modes;
1303
1304         if (old_adv != adv) {
1305                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1306                 if (ret < 0)
1307                         return ret;
1308
1309                 /* Restart autonegotiation so the new modes get sent to the
1310                  * link partner.
1311                  */
1312                 ret = phy_restart_aneg(phydev);
1313                 if (ret < 0)
1314                         return ret;
1315         }
1316
1317         return 0;
1318 }
1319 EXPORT_SYMBOL(phy_ethtool_set_eee);
1320
1321 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1322 {
1323         if (phydev->drv && phydev->drv->set_wol)
1324                 return phydev->drv->set_wol(phydev, wol);
1325
1326         return -EOPNOTSUPP;
1327 }
1328 EXPORT_SYMBOL(phy_ethtool_set_wol);
1329
1330 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1331 {
1332         if (phydev->drv && phydev->drv->get_wol)
1333                 phydev->drv->get_wol(phydev, wol);
1334 }
1335 EXPORT_SYMBOL(phy_ethtool_get_wol);
1336
1337 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1338                                    struct ethtool_link_ksettings *cmd)
1339 {
1340         struct phy_device *phydev = ndev->phydev;
1341
1342         if (!phydev)
1343                 return -ENODEV;
1344
1345         phy_ethtool_ksettings_get(phydev, cmd);
1346
1347         return 0;
1348 }
1349 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1350
1351 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1352                                    const struct ethtool_link_ksettings *cmd)
1353 {
1354         struct phy_device *phydev = ndev->phydev;
1355
1356         if (!phydev)
1357                 return -ENODEV;
1358
1359         return phy_ethtool_ksettings_set(phydev, cmd);
1360 }
1361 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1362
1363 int phy_ethtool_nway_reset(struct net_device *ndev)
1364 {
1365         struct phy_device *phydev = ndev->phydev;
1366
1367         if (!phydev)
1368                 return -ENODEV;
1369
1370         if (!phydev->drv)
1371                 return -EIO;
1372
1373         return phy_restart_aneg(phydev);
1374 }
1375 EXPORT_SYMBOL(phy_ethtool_nway_reset);