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, sync);
 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 /**
 639  * phy_start_machine - start PHY state machine tracking
 640  * @phydev: the phy_device struct
 641  *
 642  * Description: The PHY infrastructure can run a state machine
 643  *   which tracks whether the PHY is starting up, negotiating,
 644  *   etc.  This function starts the delayed workqueue which tracks
 645  *   the state of the PHY. If you want to maintain your own state machine,
 646  *   do not call this function.
 647  */
 648 void phy_start_machine(struct phy_device *phydev)
 649 {
 650         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 651 }
 652 EXPORT_SYMBOL_GPL(phy_start_machine);
 653
 654 /**
 655  * phy_trigger_machine - trigger the state machine to run
 656  *
 657  * @phydev: the phy_device struct
 658  * @sync: indicate whether we should wait for the workqueue cancelation
 659  *
 660  * Description: There has been a change in state which requires that the
 661  *   state machine runs.
 662  */
 663
 664 void phy_trigger_machine(struct phy_device *phydev, bool sync)
 665 {
 666         if (sync)
 667                 cancel_delayed_work_sync(&phydev->state_queue);
 668         else
 669                 cancel_delayed_work(&phydev->state_queue);
 670         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 671 }
 672
 673 /**
 674  * phy_stop_machine - stop the PHY state machine tracking
 675  * @phydev: target phy_device struct
 676  *
 677  * Description: Stops the state machine delayed workqueue, sets the
 678  *   state to UP (unless it wasn't up yet). This function must be
 679  *   called BEFORE phy_detach.
 680  */
 681 void phy_stop_machine(struct phy_device *phydev)
 682 {
 683         cancel_delayed_work_sync(&phydev->state_queue);
 684
 685         mutex_lock(&phydev->lock);
 686         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 687                 phydev->state = PHY_UP;
 688         mutex_unlock(&phydev->lock);
 689 }
 690
 691 /**
 692  * phy_error - enter HALTED state for this PHY device
 693  * @phydev: target phy_device struct
 694  *
 695  * Moves the PHY to the HALTED state in response to a read
 696  * or write error, and tells the controller the link is down.
 697  * Must not be called from interrupt context, or while the
 698  * phydev->lock is held.
 699  */
 700 static void phy_error(struct phy_device *phydev)
 701 {
 702         mutex_lock(&phydev->lock);
 703         phydev->state = PHY_HALTED;
 704         mutex_unlock(&phydev->lock);
 705
 706         phy_trigger_machine(phydev, false);
 707 }
 708
 709 /**
 710  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 711  * @phydev: target phy_device struct
 712  */
 713 static int phy_disable_interrupts(struct phy_device *phydev)
 714 {
 715         int err;
 716
 717         /* Disable PHY interrupts */
 718         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 719         if (err)
 720                 return err;
 721
 722         /* Clear the interrupt */
 723         return phy_clear_interrupt(phydev);
 724 }
 725
 726 /**
 727  * phy_change - Called by the phy_interrupt to handle PHY changes
 728  * @phydev: phy_device struct that interrupted
 729  */
 730 static irqreturn_t phy_change(struct phy_device *phydev)
 731 {
 732         if (phy_interrupt_is_valid(phydev)) {
 733                 if (phydev->drv->did_interrupt &&
 734                     !phydev->drv->did_interrupt(phydev))
 735                         return IRQ_NONE;
 736
 737                 if (phydev->state == PHY_HALTED)
 738                         if (phy_disable_interrupts(phydev))
 739                                 goto phy_err;
 740         }
 741
 742         mutex_lock(&phydev->lock);
 743         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 744                 phydev->state = PHY_CHANGELINK;
 745         mutex_unlock(&phydev->lock);
 746
 747         /* reschedule state queue work to run as soon as possible */
 748         phy_trigger_machine(phydev, true);
 749
 750         if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
 751                 goto phy_err;
 752         return IRQ_HANDLED;
 753
 754 phy_err:
 755         phy_error(phydev);
 756         return IRQ_NONE;
 757 }
 758
 759 /**
 760  * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
 761  * @work: work_struct that describes the work to be done
 762  */
 763 void phy_change_work(struct work_struct *work)
 764 {
 765         struct phy_device *phydev =
 766                 container_of(work, struct phy_device, phy_queue);
 767
 768         phy_change(phydev);
 769 }
 770
 771 /**
 772  * phy_interrupt - PHY interrupt handler
 773  * @irq: interrupt line
 774  * @phy_dat: phy_device pointer
 775  *
 776  * Description: When a PHY interrupt occurs, the handler disables
 777  * interrupts, and uses phy_change to handle the interrupt.
 778  */
 779 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 780 {
 781         struct phy_device *phydev = phy_dat;
 782
 783         if (PHY_HALTED == phydev->state)
 784                 return IRQ_NONE;                /* It can't be ours.  */
 785
 786         return phy_change(phydev);
 787 }
 788
 789 /**
 790  * phy_enable_interrupts - Enable the interrupts from the PHY side
 791  * @phydev: target phy_device struct
 792  */
 793 static int phy_enable_interrupts(struct phy_device *phydev)
 794 {
 795         int err = phy_clear_interrupt(phydev);
 796
 797         if (err < 0)
 798                 return err;
 799
 800         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 801 }
 802
 803 /**
 804  * phy_start_interrupts - request and enable interrupts for a PHY device
 805  * @phydev: target phy_device struct
 806  *
 807  * Description: Request the interrupt for the given PHY.
 808  *   If this fails, then we set irq to PHY_POLL.
 809  *   Otherwise, we enable the interrupts in the PHY.
 810  *   This should only be called with a valid IRQ number.
 811  *   Returns 0 on success or < 0 on error.
 812  */
 813 int phy_start_interrupts(struct phy_device *phydev)
 814 {
 815         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 816                                  IRQF_ONESHOT | IRQF_SHARED,
 817                                  phydev_name(phydev), phydev) < 0) {
 818                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 819                         phydev->mdio.bus->name, phydev->irq);
 820                 phydev->irq = PHY_POLL;
 821                 return 0;
 822         }
 823
 824         return phy_enable_interrupts(phydev);
 825 }
 826 EXPORT_SYMBOL(phy_start_interrupts);
 827
 828 /**
 829  * phy_stop_interrupts - disable interrupts from a PHY device
 830  * @phydev: target phy_device struct
 831  */
 832 int phy_stop_interrupts(struct phy_device *phydev)
 833 {
 834         int err = phy_disable_interrupts(phydev);
 835
 836         if (err)
 837                 phy_error(phydev);
 838
 839         free_irq(phydev->irq, phydev);
 840
 841         return err;
 842 }
 843 EXPORT_SYMBOL(phy_stop_interrupts);
 844
 845 /**
 846  * phy_stop - Bring down the PHY link, and stop checking the status
 847  * @phydev: target phy_device struct
 848  */
 849 void phy_stop(struct phy_device *phydev)
 850 {
 851         mutex_lock(&phydev->lock);
 852
 853         if (PHY_HALTED == phydev->state)
 854                 goto out_unlock;
 855
 856         if (phy_interrupt_is_valid(phydev))
 857                 phy_disable_interrupts(phydev);
 858
 859         phydev->state = PHY_HALTED;
 860
 861 out_unlock:
 862         mutex_unlock(&phydev->lock);
 863
 864         phy_state_machine(&phydev->state_queue.work);
 865
 866         /* Cannot call flush_scheduled_work() here as desired because
 867          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 868          * will not reenable interrupts.
 869          */
 870 }
 871 EXPORT_SYMBOL(phy_stop);
 872
 873 /**
 874  * phy_start - start or restart a PHY device
 875  * @phydev: target phy_device struct
 876  *
 877  * Description: Indicates the attached device's readiness to
 878  *   handle PHY-related work.  Used during startup to start the
 879  *   PHY, and after a call to phy_stop() to resume operation.
 880  *   Also used to indicate the MDIO bus has cleared an error
 881  *   condition.
 882  */
 883 void phy_start(struct phy_device *phydev)
 884 {
 885         int err = 0;
 886
 887         mutex_lock(&phydev->lock);
 888
 889         switch (phydev->state) {
 890         case PHY_STARTING:
 891                 phydev->state = PHY_PENDING;
 892                 break;
 893         case PHY_READY:
 894                 phydev->state = PHY_UP;
 895                 break;
 896         case PHY_HALTED:
 897                 /* if phy was suspended, bring the physical link up again */
 898                 __phy_resume(phydev);
 899
 900                 /* make sure interrupts are re-enabled for the PHY */
 901                 if (phy_interrupt_is_valid(phydev)) {
 902                         err = phy_enable_interrupts(phydev);
 903                         if (err < 0)
 904                                 break;
 905                 }
 906
 907                 phydev->state = PHY_RESUMING;
 908                 break;
 909         default:
 910                 break;
 911         }
 912         mutex_unlock(&phydev->lock);
 913
 914         phy_trigger_machine(phydev, true);
 915 }
 916 EXPORT_SYMBOL(phy_start);
 917
 918 static void phy_link_up(struct phy_device *phydev)
 919 {
 920         phydev->phy_link_change(phydev, true, true);
 921         phy_led_trigger_change_speed(phydev);
 922 }
 923
 924 static void phy_link_down(struct phy_device *phydev, bool do_carrier)
 925 {
 926         phydev->phy_link_change(phydev, false, do_carrier);
 927         phy_led_trigger_change_speed(phydev);
 928 }
 929
 930 /**
 931  * phy_state_machine - Handle the state machine
 932  * @work: work_struct that describes the work to be done
 933  */
 934 void phy_state_machine(struct work_struct *work)
 935 {
 936         struct delayed_work *dwork = to_delayed_work(work);
 937         struct phy_device *phydev =
 938                         container_of(dwork, struct phy_device, state_queue);
 939         bool needs_aneg = false, do_suspend = false;
 940         enum phy_state old_state;
 941         int err = 0;
 942         int old_link;
 943
 944         mutex_lock(&phydev->lock);
 945
 946         old_state = phydev->state;
 947
 948         if (phydev->drv && phydev->drv->link_change_notify)
 949                 phydev->drv->link_change_notify(phydev);
 950
 951         switch (phydev->state) {
 952         case PHY_DOWN:
 953         case PHY_STARTING:
 954         case PHY_READY:
 955         case PHY_PENDING:
 956                 break;
 957         case PHY_UP:
 958                 needs_aneg = true;
 959
 960                 phydev->link_timeout = PHY_AN_TIMEOUT;
 961
 962                 break;
 963         case PHY_AN:
 964                 err = phy_read_status(phydev);
 965                 if (err < 0)
 966                         break;
 967
 968                 /* If the link is down, give up on negotiation for now */
 969                 if (!phydev->link) {
 970                         phydev->state = PHY_NOLINK;
 971                         phy_link_down(phydev, true);
 972                         break;
 973                 }
 974
 975                 /* Check if negotiation is done.  Break if there's an error */
 976                 err = phy_aneg_done(phydev);
 977                 if (err < 0)
 978                         break;
 979
 980                 /* If AN is done, we're running */
 981                 if (err > 0) {
 982                         phydev->state = PHY_RUNNING;
 983                         phy_link_up(phydev);
 984                 } else if (0 == phydev->link_timeout--)
 985                         needs_aneg = true;
 986                 break;
 987         case PHY_NOLINK:
 988                 if (!phy_polling_mode(phydev))
 989                         break;
 990
 991                 err = phy_read_status(phydev);
 992                 if (err)
 993                         break;
 994
 995                 if (phydev->link) {
 996                         if (AUTONEG_ENABLE == phydev->autoneg) {
 997                                 err = phy_aneg_done(phydev);
 998                                 if (err < 0)
 999                                         break;
1000
1001                                 if (!err) {
1002                                         phydev->state = PHY_AN;
1003                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1004                                         break;
1005                                 }
1006                         }
1007                         phydev->state = PHY_RUNNING;
1008                         phy_link_up(phydev);
1009                 }
1010                 break;
1011         case PHY_FORCING:
1012                 err = genphy_update_link(phydev);
1013                 if (err)
1014                         break;
1015
1016                 if (phydev->link) {
1017                         phydev->state = PHY_RUNNING;
1018                         phy_link_up(phydev);
1019                 } else {
1020                         if (0 == phydev->link_timeout--)
1021                                 needs_aneg = true;
1022                         phy_link_down(phydev, false);
1023                 }
1024                 break;
1025         case PHY_RUNNING:
1026                 /* Only register a CHANGE if we are polling and link changed
1027                  * since latest checking.
1028                  */
1029                 if (phy_polling_mode(phydev)) {
1030                         old_link = phydev->link;
1031                         err = phy_read_status(phydev);
1032                         if (err)
1033                                 break;
1034
1035                         if (old_link != phydev->link)
1036                                 phydev->state = PHY_CHANGELINK;
1037                 }
1038                 /*
1039                  * Failsafe: check that nobody set phydev->link=0 between two
1040                  * poll cycles, otherwise we won't leave RUNNING state as long
1041                  * as link remains down.
1042                  */
1043                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1044                         phydev->state = PHY_CHANGELINK;
1045                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1046                 }
1047                 break;
1048         case PHY_CHANGELINK:
1049                 err = phy_read_status(phydev);
1050                 if (err)
1051                         break;
1052
1053                 if (phydev->link) {
1054                         phydev->state = PHY_RUNNING;
1055                         phy_link_up(phydev);
1056                 } else {
1057                         phydev->state = PHY_NOLINK;
1058                         phy_link_down(phydev, true);
1059                 }
1060                 break;
1061         case PHY_HALTED:
1062                 if (phydev->link) {
1063                         phydev->link = 0;
1064                         phy_link_down(phydev, true);
1065                         do_suspend = true;
1066                 }
1067                 break;
1068         case PHY_RESUMING:
1069                 if (AUTONEG_ENABLE == phydev->autoneg) {
1070                         err = phy_aneg_done(phydev);
1071                         if (err < 0)
1072                                 break;
1073
1074                         /* err > 0 if AN is done.
1075                          * Otherwise, it's 0, and we're  still waiting for AN
1076                          */
1077                         if (err > 0) {
1078                                 err = phy_read_status(phydev);
1079                                 if (err)
1080                                         break;
1081
1082                                 if (phydev->link) {
1083                                         phydev->state = PHY_RUNNING;
1084                                         phy_link_up(phydev);
1085                                 } else  {
1086                                         phydev->state = PHY_NOLINK;
1087                                         phy_link_down(phydev, false);
1088                                 }
1089                         } else {
1090                                 phydev->state = PHY_AN;
1091                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1092                         }
1093                 } else {
1094                         err = phy_read_status(phydev);
1095                         if (err)
1096                                 break;
1097
1098                         if (phydev->link) {
1099                                 phydev->state = PHY_RUNNING;
1100                                 phy_link_up(phydev);
1101                         } else  {
1102                                 phydev->state = PHY_NOLINK;
1103                                 phy_link_down(phydev, false);
1104                         }
1105                 }
1106                 break;
1107         }
1108
1109         mutex_unlock(&phydev->lock);
1110
1111         if (needs_aneg)
1112                 err = phy_start_aneg_priv(phydev, false);
1113         else if (do_suspend)
1114                 phy_suspend(phydev);
1115
1116         if (err < 0)
1117                 phy_error(phydev);
1118
1119         if (old_state != phydev->state)
1120                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
1121                            phy_state_to_str(old_state),
1122                            phy_state_to_str(phydev->state));
1123
1124         /* Only re-schedule a PHY state machine change if we are polling the
1125          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1126          * between states from phy_mac_interrupt().
1127          *
1128          * In state PHY_HALTED the PHY gets suspended, so rescheduling the
1129          * state machine would be pointless and possibly error prone when
1130          * called from phy_disconnect() synchronously.
1131          */
1132         if (phy_polling_mode(phydev) && old_state != PHY_HALTED)
1133                 queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1134                                    PHY_STATE_TIME * HZ);
1135 }
1136
1137 /**
1138  * phy_mac_interrupt - MAC says the link has changed
1139  * @phydev: phy_device struct with changed link
1140  *
1141  * The MAC layer is able to indicate there has been a change in the PHY link
1142  * status. Trigger the state machine and work a work queue.
1143  */
1144 void phy_mac_interrupt(struct phy_device *phydev)
1145 {
1146         /* Trigger a state machine change */
1147         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1148 }
1149 EXPORT_SYMBOL(phy_mac_interrupt);
1150
1151 /**
1152  * phy_init_eee - init and check the EEE feature
1153  * @phydev: target phy_device struct
1154  * @clk_stop_enable: PHY may stop the clock during LPI
1155  *
1156  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1157  * is supported by looking at the MMD registers 3.20 and 7.60/61
1158  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1159  * bit if required.
1160  */
1161 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1162 {
1163         if (!phydev->drv)
1164                 return -EIO;
1165
1166         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1167          */
1168         if (phydev->duplex == DUPLEX_FULL) {
1169                 int eee_lp, eee_cap, eee_adv;
1170                 u32 lp, cap, adv;
1171                 int status;
1172
1173                 /* Read phy status to properly get the right settings */
1174                 status = phy_read_status(phydev);
1175                 if (status)
1176                         return status;
1177
1178                 /* First check if the EEE ability is supported */
1179                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1180                 if (eee_cap <= 0)
1181                         goto eee_exit_err;
1182
1183                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1184                 if (!cap)
1185                         goto eee_exit_err;
1186
1187                 /* Check which link settings negotiated and verify it in
1188                  * the EEE advertising registers.
1189                  */
1190                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1191                 if (eee_lp <= 0)
1192                         goto eee_exit_err;
1193
1194                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1195                 if (eee_adv <= 0)
1196                         goto eee_exit_err;
1197
1198                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1199                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1200                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1201                         goto eee_exit_err;
1202
1203                 if (clk_stop_enable) {
1204                         /* Configure the PHY to stop receiving xMII
1205                          * clock while it is signaling LPI.
1206                          */
1207                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1208                         if (val < 0)
1209                                 return val;
1210
1211                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1212                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1213                 }
1214
1215                 return 0; /* EEE supported */
1216         }
1217 eee_exit_err:
1218         return -EPROTONOSUPPORT;
1219 }
1220 EXPORT_SYMBOL(phy_init_eee);
1221
1222 /**
1223  * phy_get_eee_err - report the EEE wake error count
1224  * @phydev: target phy_device struct
1225  *
1226  * Description: it is to report the number of time where the PHY
1227  * failed to complete its normal wake sequence.
1228  */
1229 int phy_get_eee_err(struct phy_device *phydev)
1230 {
1231         if (!phydev->drv)
1232                 return -EIO;
1233
1234         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1235 }
1236 EXPORT_SYMBOL(phy_get_eee_err);
1237
1238 /**
1239  * phy_ethtool_get_eee - get EEE supported and status
1240  * @phydev: target phy_device struct
1241  * @data: ethtool_eee data
1242  *
1243  * Description: it reportes the Supported/Advertisement/LP Advertisement
1244  * capabilities.
1245  */
1246 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1247 {
1248         int val;
1249
1250         if (!phydev->drv)
1251                 return -EIO;
1252
1253         /* Get Supported EEE */
1254         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1255         if (val < 0)
1256                 return val;
1257         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1258
1259         /* Get advertisement EEE */
1260         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1261         if (val < 0)
1262                 return val;
1263         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1264
1265         /* Get LP advertisement EEE */
1266         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1267         if (val < 0)
1268                 return val;
1269         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1270
1271         return 0;
1272 }
1273 EXPORT_SYMBOL(phy_ethtool_get_eee);
1274
1275 /**
1276  * phy_ethtool_set_eee - set EEE supported and status
1277  * @phydev: target phy_device struct
1278  * @data: ethtool_eee data
1279  *
1280  * Description: it is to program the Advertisement EEE register.
1281  */
1282 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1283 {
1284         int cap, old_adv, adv, ret;
1285
1286         if (!phydev->drv)
1287                 return -EIO;
1288
1289         /* Get Supported EEE */
1290         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1291         if (cap < 0)
1292                 return cap;
1293
1294         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1295         if (old_adv < 0)
1296                 return old_adv;
1297
1298         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1299
1300         /* Mask prohibited EEE modes */
1301         adv &= ~phydev->eee_broken_modes;
1302
1303         if (old_adv != adv) {
1304                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1305                 if (ret < 0)
1306                         return ret;
1307
1308                 /* Restart autonegotiation so the new modes get sent to the
1309                  * link partner.
1310                  */
1311                 ret = phy_restart_aneg(phydev);
1312                 if (ret < 0)
1313                         return ret;
1314         }
1315
1316         return 0;
1317 }
1318 EXPORT_SYMBOL(phy_ethtool_set_eee);
1319
1320 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1321 {
1322         if (phydev->drv && phydev->drv->set_wol)
1323                 return phydev->drv->set_wol(phydev, wol);
1324
1325         return -EOPNOTSUPP;
1326 }
1327 EXPORT_SYMBOL(phy_ethtool_set_wol);
1328
1329 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1330 {
1331         if (phydev->drv && phydev->drv->get_wol)
1332                 phydev->drv->get_wol(phydev, wol);
1333 }
1334 EXPORT_SYMBOL(phy_ethtool_get_wol);
1335
1336 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1337                                    struct ethtool_link_ksettings *cmd)
1338 {
1339         struct phy_device *phydev = ndev->phydev;
1340
1341         if (!phydev)
1342                 return -ENODEV;
1343
1344         phy_ethtool_ksettings_get(phydev, cmd);
1345
1346         return 0;
1347 }
1348 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1349
1350 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1351                                    const struct ethtool_link_ksettings *cmd)
1352 {
1353         struct phy_device *phydev = ndev->phydev;
1354
1355         if (!phydev)
1356                 return -ENODEV;
1357
1358         return phy_ethtool_ksettings_set(phydev, cmd);
1359 }
1360 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1361
1362 int phy_ethtool_nway_reset(struct net_device *ndev)
1363 {
1364         struct phy_device *phydev = ndev->phydev;
1365
1366         if (!phydev)
1367                 return -ENODEV;
1368
1369         if (!phydev->drv)
1370                 return -EIO;
1371
1372         return phy_restart_aneg(phydev);
1373 }
1374 EXPORT_SYMBOL(phy_ethtool_nway_reset);