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         if (autoneg == AUTONEG_DISABLE) {
 339                 phydev->speed = speed;
 340                 phydev->duplex = duplex;
 341         }
 342
 343         phydev->advertising = advertising;
 344
 345         if (autoneg == AUTONEG_ENABLE)
 346                 phydev->advertising |= ADVERTISED_Autoneg;
 347         else
 348                 phydev->advertising &= ~ADVERTISED_Autoneg;
 349
 350         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 351
 352         /* Restart the PHY */
 353         phy_start_aneg(phydev);
 354
 355         return 0;
 356 }
 357 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 358
 359 void phy_ethtool_ksettings_get(struct phy_device *phydev,
 360                                struct ethtool_link_ksettings *cmd)
 361 {
 362         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 363                                                 phydev->supported);
 364
 365         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 366                                                 phydev->advertising);
 367
 368         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
 369                                                 phydev->lp_advertising);
 370
 371         cmd->base.speed = phydev->speed;
 372         cmd->base.duplex = phydev->duplex;
 373         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 374                 cmd->base.port = PORT_BNC;
 375         else
 376                 cmd->base.port = PORT_MII;
 377         cmd->base.transceiver = phy_is_internal(phydev) ?
 378                                 XCVR_INTERNAL : XCVR_EXTERNAL;
 379         cmd->base.phy_address = phydev->mdio.addr;
 380         cmd->base.autoneg = phydev->autoneg;
 381         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 382         cmd->base.eth_tp_mdix = phydev->mdix;
 383 }
 384 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 385
 386 /**
 387  * phy_mii_ioctl - generic PHY MII ioctl interface
 388  * @phydev: the phy_device struct
 389  * @ifr: &struct ifreq for socket ioctl's
 390  * @cmd: ioctl cmd to execute
 391  *
 392  * Note that this function is currently incompatible with the
 393  * PHYCONTROL layer.  It changes registers without regard to
 394  * current state.  Use at own risk.
 395  */
 396 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 397 {
 398         struct mii_ioctl_data *mii_data = if_mii(ifr);
 399         u16 val = mii_data->val_in;
 400         bool change_autoneg = false;
 401
 402         switch (cmd) {
 403         case SIOCGMIIPHY:
 404                 mii_data->phy_id = phydev->mdio.addr;
 405                 /* fall through */
 406
 407         case SIOCGMIIREG:
 408                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 409                                                  mii_data->phy_id,
 410                                                  mii_data->reg_num);
 411                 return 0;
 412
 413         case SIOCSMIIREG:
 414                 if (mii_data->phy_id == phydev->mdio.addr) {
 415                         switch (mii_data->reg_num) {
 416                         case MII_BMCR:
 417                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 418                                         if (phydev->autoneg == AUTONEG_ENABLE)
 419                                                 change_autoneg = true;
 420                                         phydev->autoneg = AUTONEG_DISABLE;
 421                                         if (val & BMCR_FULLDPLX)
 422                                                 phydev->duplex = DUPLEX_FULL;
 423                                         else
 424                                                 phydev->duplex = DUPLEX_HALF;
 425                                         if (val & BMCR_SPEED1000)
 426                                                 phydev->speed = SPEED_1000;
 427                                         else if (val & BMCR_SPEED100)
 428                                                 phydev->speed = SPEED_100;
 429                                         else phydev->speed = SPEED_10;
 430                                 }
 431                                 else {
 432                                         if (phydev->autoneg == AUTONEG_DISABLE)
 433                                                 change_autoneg = true;
 434                                         phydev->autoneg = AUTONEG_ENABLE;
 435                                 }
 436                                 break;
 437                         case MII_ADVERTISE:
 438                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 439                                 change_autoneg = true;
 440                                 break;
 441                         default:
 442                                 /* do nothing */
 443                                 break;
 444                         }
 445                 }
 446
 447                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 448                               mii_data->reg_num, val);
 449
 450                 if (mii_data->phy_id == phydev->mdio.addr &&
 451                     mii_data->reg_num == MII_BMCR &&
 452                     val & BMCR_RESET)
 453                         return phy_init_hw(phydev);
 454
 455                 if (change_autoneg)
 456                         return phy_start_aneg(phydev);
 457
 458                 return 0;
 459
 460         case SIOCSHWTSTAMP:
 461                 if (phydev->drv && phydev->drv->hwtstamp)
 462                         return phydev->drv->hwtstamp(phydev, ifr);
 463                 /* fall through */
 464
 465         default:
 466                 return -EOPNOTSUPP;
 467         }
 468 }
 469 EXPORT_SYMBOL(phy_mii_ioctl);
 470
 471 static int phy_config_aneg(struct phy_device *phydev)
 472 {
 473         if (phydev->drv->config_aneg)
 474                 return phydev->drv->config_aneg(phydev);
 475
 476         /* Clause 45 PHYs that don't implement Clause 22 registers are not
 477          * allowed to call genphy_config_aneg()
 478          */
 479         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 480                 return -EOPNOTSUPP;
 481
 482         return genphy_config_aneg(phydev);
 483 }
 484
 485 /**
 486  * phy_start_aneg_priv - start auto-negotiation for this PHY device
 487  * @phydev: the phy_device struct
 488  * @sync: indicate whether we should wait for the workqueue cancelation
 489  *
 490  * Description: Sanitizes the settings (if we're not autonegotiating
 491  *   them), and then calls the driver's config_aneg function.
 492  *   If the PHYCONTROL Layer is operating, we change the state to
 493  *   reflect the beginning of Auto-negotiation or forcing.
 494  */
 495 static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 496 {
 497         bool trigger = 0;
 498         int err;
 499
 500         if (!phydev->drv)
 501                 return -EIO;
 502
 503         mutex_lock(&phydev->lock);
 504
 505         if (AUTONEG_DISABLE == phydev->autoneg)
 506                 phy_sanitize_settings(phydev);
 507
 508         /* Invalidate LP advertising flags */
 509         phydev->lp_advertising = 0;
 510
 511         err = phy_config_aneg(phydev);
 512         if (err < 0)
 513                 goto out_unlock;
 514
 515         if (phydev->state != PHY_HALTED) {
 516                 if (AUTONEG_ENABLE == phydev->autoneg) {
 517                         phydev->state = PHY_AN;
 518                         phydev->link_timeout = PHY_AN_TIMEOUT;
 519                 } else {
 520                         phydev->state = PHY_FORCING;
 521                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 522                 }
 523         }
 524
 525         /* Re-schedule a PHY state machine to check PHY status because
 526          * negotiation may already be done and aneg interrupt may not be
 527          * generated.
 528          */
 529         if (!phy_polling_mode(phydev) && phydev->state == PHY_AN) {
 530                 err = phy_aneg_done(phydev);
 531                 if (err > 0) {
 532                         trigger = true;
 533                         err = 0;
 534                 }
 535         }
 536
 537 out_unlock:
 538         mutex_unlock(&phydev->lock);
 539
 540         if (trigger)
 541                 phy_trigger_machine(phydev, sync);
 542
 543         return err;
 544 }
 545
 546 /**
 547  * phy_start_aneg - start auto-negotiation for this PHY device
 548  * @phydev: the phy_device struct
 549  *
 550  * Description: Sanitizes the settings (if we're not autonegotiating
 551  *   them), and then calls the driver's config_aneg function.
 552  *   If the PHYCONTROL Layer is operating, we change the state to
 553  *   reflect the beginning of Auto-negotiation or forcing.
 554  */
 555 int phy_start_aneg(struct phy_device *phydev)
 556 {
 557         return phy_start_aneg_priv(phydev, true);
 558 }
 559 EXPORT_SYMBOL(phy_start_aneg);
 560
 561 static int phy_poll_aneg_done(struct phy_device *phydev)
 562 {
 563         unsigned int retries = 100;
 564         int ret;
 565
 566         do {
 567                 msleep(100);
 568                 ret = phy_aneg_done(phydev);
 569         } while (!ret && --retries);
 570
 571         if (!ret)
 572                 return -ETIMEDOUT;
 573
 574         return ret < 0 ? ret : 0;
 575 }
 576
 577 /**
 578  * phy_speed_down - set speed to lowest speed supported by both link partners
 579  * @phydev: the phy_device struct
 580  * @sync: perform action synchronously
 581  *
 582  * Description: Typically used to save energy when waiting for a WoL packet
 583  *
 584  * WARNING: Setting sync to false may cause the system being unable to suspend
 585  * in case the PHY generates an interrupt when finishing the autonegotiation.
 586  * This interrupt may wake up the system immediately after suspend.
 587  * Therefore use sync = false only if you're sure it's safe with the respective
 588  * network chip.
 589  */
 590 int phy_speed_down(struct phy_device *phydev, bool sync)
 591 {
 592         u32 adv = phydev->lp_advertising & phydev->supported;
 593         u32 adv_old = phydev->advertising;
 594         int ret;
 595
 596         if (phydev->autoneg != AUTONEG_ENABLE)
 597                 return 0;
 598
 599         if (adv & PHY_10BT_FEATURES)
 600                 phydev->advertising &= ~(PHY_100BT_FEATURES |
 601                                          PHY_1000BT_FEATURES);
 602         else if (adv & PHY_100BT_FEATURES)
 603                 phydev->advertising &= ~PHY_1000BT_FEATURES;
 604
 605         if (phydev->advertising == adv_old)
 606                 return 0;
 607
 608         ret = phy_config_aneg(phydev);
 609         if (ret)
 610                 return ret;
 611
 612         return sync ? phy_poll_aneg_done(phydev) : 0;
 613 }
 614 EXPORT_SYMBOL_GPL(phy_speed_down);
 615
 616 /**
 617  * phy_speed_up - (re)set advertised speeds to all supported speeds
 618  * @phydev: the phy_device struct
 619  *
 620  * Description: Used to revert the effect of phy_speed_down
 621  */
 622 int phy_speed_up(struct phy_device *phydev)
 623 {
 624         u32 mask = PHY_10BT_FEATURES | PHY_100BT_FEATURES | PHY_1000BT_FEATURES;
 625         u32 adv_old = phydev->advertising;
 626
 627         if (phydev->autoneg != AUTONEG_ENABLE)
 628                 return 0;
 629
 630         phydev->advertising = (adv_old & ~mask) | (phydev->supported & mask);
 631
 632         if (phydev->advertising == adv_old)
 633                 return 0;
 634
 635         return phy_config_aneg(phydev);
 636 }
 637 EXPORT_SYMBOL_GPL(phy_speed_up);
 638
 639 /**
 640  * phy_start_machine - start PHY state machine tracking
 641  * @phydev: the phy_device struct
 642  *
 643  * Description: The PHY infrastructure can run a state machine
 644  *   which tracks whether the PHY is starting up, negotiating,
 645  *   etc.  This function starts the delayed workqueue which tracks
 646  *   the state of the PHY. If you want to maintain your own state machine,
 647  *   do not call this function.
 648  */
 649 void phy_start_machine(struct phy_device *phydev)
 650 {
 651         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 652 }
 653 EXPORT_SYMBOL_GPL(phy_start_machine);
 654
 655 /**
 656  * phy_trigger_machine - trigger the state machine to run
 657  *
 658  * @phydev: the phy_device struct
 659  * @sync: indicate whether we should wait for the workqueue cancelation
 660  *
 661  * Description: There has been a change in state which requires that the
 662  *   state machine runs.
 663  */
 664
 665 void phy_trigger_machine(struct phy_device *phydev, bool sync)
 666 {
 667         if (sync)
 668                 cancel_delayed_work_sync(&phydev->state_queue);
 669         else
 670                 cancel_delayed_work(&phydev->state_queue);
 671         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 672 }
 673
 674 /**
 675  * phy_stop_machine - stop the PHY state machine tracking
 676  * @phydev: target phy_device struct
 677  *
 678  * Description: Stops the state machine delayed workqueue, sets the
 679  *   state to UP (unless it wasn't up yet). This function must be
 680  *   called BEFORE phy_detach.
 681  */
 682 void phy_stop_machine(struct phy_device *phydev)
 683 {
 684         cancel_delayed_work_sync(&phydev->state_queue);
 685
 686         mutex_lock(&phydev->lock);
 687         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 688                 phydev->state = PHY_UP;
 689         mutex_unlock(&phydev->lock);
 690 }
 691
 692 /**
 693  * phy_error - enter HALTED state for this PHY device
 694  * @phydev: target phy_device struct
 695  *
 696  * Moves the PHY to the HALTED state in response to a read
 697  * or write error, and tells the controller the link is down.
 698  * Must not be called from interrupt context, or while the
 699  * phydev->lock is held.
 700  */
 701 static void phy_error(struct phy_device *phydev)
 702 {
 703         mutex_lock(&phydev->lock);
 704         phydev->state = PHY_HALTED;
 705         mutex_unlock(&phydev->lock);
 706
 707         phy_trigger_machine(phydev, false);
 708 }
 709
 710 /**
 711  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 712  * @phydev: target phy_device struct
 713  */
 714 static int phy_disable_interrupts(struct phy_device *phydev)
 715 {
 716         int err;
 717
 718         /* Disable PHY interrupts */
 719         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 720         if (err)
 721                 return err;
 722
 723         /* Clear the interrupt */
 724         return phy_clear_interrupt(phydev);
 725 }
 726
 727 /**
 728  * phy_change - Called by the phy_interrupt to handle PHY changes
 729  * @phydev: phy_device struct that interrupted
 730  */
 731 static irqreturn_t phy_change(struct phy_device *phydev)
 732 {
 733         if (phy_interrupt_is_valid(phydev)) {
 734                 if (phydev->drv->did_interrupt &&
 735                     !phydev->drv->did_interrupt(phydev))
 736                         return IRQ_NONE;
 737
 738                 if (phydev->state == PHY_HALTED)
 739                         if (phy_disable_interrupts(phydev))
 740                                 goto phy_err;
 741         }
 742
 743         mutex_lock(&phydev->lock);
 744         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 745                 phydev->state = PHY_CHANGELINK;
 746         mutex_unlock(&phydev->lock);
 747
 748         /* reschedule state queue work to run as soon as possible */
 749         phy_trigger_machine(phydev, true);
 750
 751         if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
 752                 goto phy_err;
 753         return IRQ_HANDLED;
 754
 755 phy_err:
 756         phy_error(phydev);
 757         return IRQ_NONE;
 758 }
 759
 760 /**
 761  * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
 762  * @work: work_struct that describes the work to be done
 763  */
 764 void phy_change_work(struct work_struct *work)
 765 {
 766         struct phy_device *phydev =
 767                 container_of(work, struct phy_device, phy_queue);
 768
 769         phy_change(phydev);
 770 }
 771
 772 /**
 773  * phy_interrupt - PHY interrupt handler
 774  * @irq: interrupt line
 775  * @phy_dat: phy_device pointer
 776  *
 777  * Description: When a PHY interrupt occurs, the handler disables
 778  * interrupts, and uses phy_change to handle the interrupt.
 779  */
 780 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 781 {
 782         struct phy_device *phydev = phy_dat;
 783
 784         if (PHY_HALTED == phydev->state)
 785                 return IRQ_NONE;                /* It can't be ours.  */
 786
 787         return phy_change(phydev);
 788 }
 789
 790 /**
 791  * phy_enable_interrupts - Enable the interrupts from the PHY side
 792  * @phydev: target phy_device struct
 793  */
 794 static int phy_enable_interrupts(struct phy_device *phydev)
 795 {
 796         int err = phy_clear_interrupt(phydev);
 797
 798         if (err < 0)
 799                 return err;
 800
 801         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 802 }
 803
 804 /**
 805  * phy_start_interrupts - request and enable interrupts for a PHY device
 806  * @phydev: target phy_device struct
 807  *
 808  * Description: Request the interrupt for the given PHY.
 809  *   If this fails, then we set irq to PHY_POLL.
 810  *   Otherwise, we enable the interrupts in the PHY.
 811  *   This should only be called with a valid IRQ number.
 812  *   Returns 0 on success or < 0 on error.
 813  */
 814 int phy_start_interrupts(struct phy_device *phydev)
 815 {
 816         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 817                                  IRQF_ONESHOT | IRQF_SHARED,
 818                                  phydev_name(phydev), phydev) < 0) {
 819                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 820                         phydev->mdio.bus->name, phydev->irq);
 821                 phydev->irq = PHY_POLL;
 822                 return 0;
 823         }
 824
 825         return phy_enable_interrupts(phydev);
 826 }
 827 EXPORT_SYMBOL(phy_start_interrupts);
 828
 829 /**
 830  * phy_stop_interrupts - disable interrupts from a PHY device
 831  * @phydev: target phy_device struct
 832  */
 833 int phy_stop_interrupts(struct phy_device *phydev)
 834 {
 835         int err = phy_disable_interrupts(phydev);
 836
 837         if (err)
 838                 phy_error(phydev);
 839
 840         free_irq(phydev->irq, phydev);
 841
 842         return err;
 843 }
 844 EXPORT_SYMBOL(phy_stop_interrupts);
 845
 846 /**
 847  * phy_stop - Bring down the PHY link, and stop checking the status
 848  * @phydev: target phy_device struct
 849  */
 850 void phy_stop(struct phy_device *phydev)
 851 {
 852         mutex_lock(&phydev->lock);
 853
 854         if (PHY_HALTED == phydev->state)
 855                 goto out_unlock;
 856
 857         if (phy_interrupt_is_valid(phydev))
 858                 phy_disable_interrupts(phydev);
 859
 860         phydev->state = PHY_HALTED;
 861
 862 out_unlock:
 863         mutex_unlock(&phydev->lock);
 864
 865         /* Cannot call flush_scheduled_work() here as desired because
 866          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 867          * will not reenable interrupts.
 868          */
 869 }
 870 EXPORT_SYMBOL(phy_stop);
 871
 872 /**
 873  * phy_start - start or restart a PHY device
 874  * @phydev: target phy_device struct
 875  *
 876  * Description: Indicates the attached device's readiness to
 877  *   handle PHY-related work.  Used during startup to start the
 878  *   PHY, and after a call to phy_stop() to resume operation.
 879  *   Also used to indicate the MDIO bus has cleared an error
 880  *   condition.
 881  */
 882 void phy_start(struct phy_device *phydev)
 883 {
 884         int err = 0;
 885
 886         mutex_lock(&phydev->lock);
 887
 888         switch (phydev->state) {
 889         case PHY_STARTING:
 890                 phydev->state = PHY_PENDING;
 891                 break;
 892         case PHY_READY:
 893                 phydev->state = PHY_UP;
 894                 break;
 895         case PHY_HALTED:
 896                 /* if phy was suspended, bring the physical link up again */
 897                 __phy_resume(phydev);
 898
 899                 /* make sure interrupts are re-enabled for the PHY */
 900                 if (phy_interrupt_is_valid(phydev)) {
 901                         err = phy_enable_interrupts(phydev);
 902                         if (err < 0)
 903                                 break;
 904                 }
 905
 906                 phydev->state = PHY_RESUMING;
 907                 break;
 908         default:
 909                 break;
 910         }
 911         mutex_unlock(&phydev->lock);
 912
 913         phy_trigger_machine(phydev, true);
 914 }
 915 EXPORT_SYMBOL(phy_start);
 916
 917 static void phy_link_up(struct phy_device *phydev)
 918 {
 919         phydev->phy_link_change(phydev, true, true);
 920         phy_led_trigger_change_speed(phydev);
 921 }
 922
 923 static void phy_link_down(struct phy_device *phydev, bool do_carrier)
 924 {
 925         phydev->phy_link_change(phydev, false, do_carrier);
 926         phy_led_trigger_change_speed(phydev);
 927 }
 928
 929 /**
 930  * phy_state_machine - Handle the state machine
 931  * @work: work_struct that describes the work to be done
 932  */
 933 void phy_state_machine(struct work_struct *work)
 934 {
 935         struct delayed_work *dwork = to_delayed_work(work);
 936         struct phy_device *phydev =
 937                         container_of(dwork, struct phy_device, state_queue);
 938         bool needs_aneg = false, do_suspend = false;
 939         enum phy_state old_state;
 940         int err = 0;
 941         int old_link;
 942
 943         mutex_lock(&phydev->lock);
 944
 945         old_state = phydev->state;
 946
 947         if (phydev->drv && phydev->drv->link_change_notify)
 948                 phydev->drv->link_change_notify(phydev);
 949
 950         switch (phydev->state) {
 951         case PHY_DOWN:
 952         case PHY_STARTING:
 953         case PHY_READY:
 954         case PHY_PENDING:
 955                 break;
 956         case PHY_UP:
 957                 needs_aneg = true;
 958
 959                 phydev->link_timeout = PHY_AN_TIMEOUT;
 960
 961                 break;
 962         case PHY_AN:
 963                 err = phy_read_status(phydev);
 964                 if (err < 0)
 965                         break;
 966
 967                 /* If the link is down, give up on negotiation for now */
 968                 if (!phydev->link) {
 969                         phydev->state = PHY_NOLINK;
 970                         phy_link_down(phydev, true);
 971                         break;
 972                 }
 973
 974                 /* Check if negotiation is done.  Break if there's an error */
 975                 err = phy_aneg_done(phydev);
 976                 if (err < 0)
 977                         break;
 978
 979                 /* If AN is done, we're running */
 980                 if (err > 0) {
 981                         phydev->state = PHY_RUNNING;
 982                         phy_link_up(phydev);
 983                 } else if (0 == phydev->link_timeout--)
 984                         needs_aneg = true;
 985                 break;
 986         case PHY_NOLINK:
 987                 if (!phy_polling_mode(phydev))
 988                         break;
 989
 990                 err = phy_read_status(phydev);
 991                 if (err)
 992                         break;
 993
 994                 if (phydev->link) {
 995                         if (AUTONEG_ENABLE == phydev->autoneg) {
 996                                 err = phy_aneg_done(phydev);
 997                                 if (err < 0)
 998                                         break;
 999
1000                                 if (!err) {
1001                                         phydev->state = PHY_AN;
1002                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1003                                         break;
1004                                 }
1005                         }
1006                         phydev->state = PHY_RUNNING;
1007                         phy_link_up(phydev);
1008                 }
1009                 break;
1010         case PHY_FORCING:
1011                 err = genphy_update_link(phydev);
1012                 if (err)
1013                         break;
1014
1015                 if (phydev->link) {
1016                         phydev->state = PHY_RUNNING;
1017                         phy_link_up(phydev);
1018                 } else {
1019                         if (0 == phydev->link_timeout--)
1020                                 needs_aneg = true;
1021                         phy_link_down(phydev, false);
1022                 }
1023                 break;
1024         case PHY_RUNNING:
1025                 /* Only register a CHANGE if we are polling and link changed
1026                  * since latest checking.
1027                  */
1028                 if (phy_polling_mode(phydev)) {
1029                         old_link = phydev->link;
1030                         err = phy_read_status(phydev);
1031                         if (err)
1032                                 break;
1033
1034                         if (old_link != phydev->link)
1035                                 phydev->state = PHY_CHANGELINK;
1036                 }
1037                 /*
1038                  * Failsafe: check that nobody set phydev->link=0 between two
1039                  * poll cycles, otherwise we won't leave RUNNING state as long
1040                  * as link remains down.
1041                  */
1042                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1043                         phydev->state = PHY_CHANGELINK;
1044                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1045                 }
1046                 break;
1047         case PHY_CHANGELINK:
1048                 err = phy_read_status(phydev);
1049                 if (err)
1050                         break;
1051
1052                 if (phydev->link) {
1053                         phydev->state = PHY_RUNNING;
1054                         phy_link_up(phydev);
1055                 } else {
1056                         phydev->state = PHY_NOLINK;
1057                         phy_link_down(phydev, true);
1058                 }
1059                 break;
1060         case PHY_HALTED:
1061                 if (phydev->link) {
1062                         phydev->link = 0;
1063                         phy_link_down(phydev, true);
1064                         do_suspend = true;
1065                 }
1066                 break;
1067         case PHY_RESUMING:
1068                 if (AUTONEG_ENABLE == phydev->autoneg) {
1069                         err = phy_aneg_done(phydev);
1070                         if (err < 0)
1071                                 break;
1072
1073                         /* err > 0 if AN is done.
1074                          * Otherwise, it's 0, and we're  still waiting for AN
1075                          */
1076                         if (err > 0) {
1077                                 err = phy_read_status(phydev);
1078                                 if (err)
1079                                         break;
1080
1081                                 if (phydev->link) {
1082                                         phydev->state = PHY_RUNNING;
1083                                         phy_link_up(phydev);
1084                                 } else  {
1085                                         phydev->state = PHY_NOLINK;
1086                                         phy_link_down(phydev, false);
1087                                 }
1088                         } else {
1089                                 phydev->state = PHY_AN;
1090                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1091                         }
1092                 } else {
1093                         err = phy_read_status(phydev);
1094                         if (err)
1095                                 break;
1096
1097                         if (phydev->link) {
1098                                 phydev->state = PHY_RUNNING;
1099                                 phy_link_up(phydev);
1100                         } else  {
1101                                 phydev->state = PHY_NOLINK;
1102                                 phy_link_down(phydev, false);
1103                         }
1104                 }
1105                 break;
1106         }
1107
1108         mutex_unlock(&phydev->lock);
1109
1110         if (needs_aneg)
1111                 err = phy_start_aneg_priv(phydev, false);
1112         else if (do_suspend)
1113                 phy_suspend(phydev);
1114
1115         if (err < 0)
1116                 phy_error(phydev);
1117
1118         if (old_state != phydev->state)
1119                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
1120                            phy_state_to_str(old_state),
1121                            phy_state_to_str(phydev->state));
1122
1123         /* Only re-schedule a PHY state machine change if we are polling the
1124          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1125          * between states from phy_mac_interrupt()
1126          */
1127         if (phy_polling_mode(phydev))
1128                 queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1129                                    PHY_STATE_TIME * HZ);
1130 }
1131
1132 /**
1133  * phy_mac_interrupt - MAC says the link has changed
1134  * @phydev: phy_device struct with changed link
1135  *
1136  * The MAC layer is able to indicate there has been a change in the PHY link
1137  * status. Trigger the state machine and work a work queue.
1138  */
1139 void phy_mac_interrupt(struct phy_device *phydev)
1140 {
1141         /* Trigger a state machine change */
1142         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1143 }
1144 EXPORT_SYMBOL(phy_mac_interrupt);
1145
1146 /**
1147  * phy_init_eee - init and check the EEE feature
1148  * @phydev: target phy_device struct
1149  * @clk_stop_enable: PHY may stop the clock during LPI
1150  *
1151  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1152  * is supported by looking at the MMD registers 3.20 and 7.60/61
1153  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1154  * bit if required.
1155  */
1156 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1157 {
1158         if (!phydev->drv)
1159                 return -EIO;
1160
1161         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1162          */
1163         if (phydev->duplex == DUPLEX_FULL) {
1164                 int eee_lp, eee_cap, eee_adv;
1165                 u32 lp, cap, adv;
1166                 int status;
1167
1168                 /* Read phy status to properly get the right settings */
1169                 status = phy_read_status(phydev);
1170                 if (status)
1171                         return status;
1172
1173                 /* First check if the EEE ability is supported */
1174                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1175                 if (eee_cap <= 0)
1176                         goto eee_exit_err;
1177
1178                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1179                 if (!cap)
1180                         goto eee_exit_err;
1181
1182                 /* Check which link settings negotiated and verify it in
1183                  * the EEE advertising registers.
1184                  */
1185                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1186                 if (eee_lp <= 0)
1187                         goto eee_exit_err;
1188
1189                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1190                 if (eee_adv <= 0)
1191                         goto eee_exit_err;
1192
1193                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1194                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1195                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1196                         goto eee_exit_err;
1197
1198                 if (clk_stop_enable) {
1199                         /* Configure the PHY to stop receiving xMII
1200                          * clock while it is signaling LPI.
1201                          */
1202                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1203                         if (val < 0)
1204                                 return val;
1205
1206                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1207                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1208                 }
1209
1210                 return 0; /* EEE supported */
1211         }
1212 eee_exit_err:
1213         return -EPROTONOSUPPORT;
1214 }
1215 EXPORT_SYMBOL(phy_init_eee);
1216
1217 /**
1218  * phy_get_eee_err - report the EEE wake error count
1219  * @phydev: target phy_device struct
1220  *
1221  * Description: it is to report the number of time where the PHY
1222  * failed to complete its normal wake sequence.
1223  */
1224 int phy_get_eee_err(struct phy_device *phydev)
1225 {
1226         if (!phydev->drv)
1227                 return -EIO;
1228
1229         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1230 }
1231 EXPORT_SYMBOL(phy_get_eee_err);
1232
1233 /**
1234  * phy_ethtool_get_eee - get EEE supported and status
1235  * @phydev: target phy_device struct
1236  * @data: ethtool_eee data
1237  *
1238  * Description: it reportes the Supported/Advertisement/LP Advertisement
1239  * capabilities.
1240  */
1241 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1242 {
1243         int val;
1244
1245         if (!phydev->drv)
1246                 return -EIO;
1247
1248         /* Get Supported EEE */
1249         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1250         if (val < 0)
1251                 return val;
1252         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1253
1254         /* Get advertisement EEE */
1255         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1256         if (val < 0)
1257                 return val;
1258         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1259
1260         /* Get LP advertisement EEE */
1261         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1262         if (val < 0)
1263                 return val;
1264         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1265
1266         return 0;
1267 }
1268 EXPORT_SYMBOL(phy_ethtool_get_eee);
1269
1270 /**
1271  * phy_ethtool_set_eee - set EEE supported and status
1272  * @phydev: target phy_device struct
1273  * @data: ethtool_eee data
1274  *
1275  * Description: it is to program the Advertisement EEE register.
1276  */
1277 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1278 {
1279         int cap, old_adv, adv, ret;
1280
1281         if (!phydev->drv)
1282                 return -EIO;
1283
1284         /* Get Supported EEE */
1285         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1286         if (cap < 0)
1287                 return cap;
1288
1289         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1290         if (old_adv < 0)
1291                 return old_adv;
1292
1293         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1294
1295         /* Mask prohibited EEE modes */
1296         adv &= ~phydev->eee_broken_modes;
1297
1298         if (old_adv != adv) {
1299                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1300                 if (ret < 0)
1301                         return ret;
1302
1303                 /* Restart autonegotiation so the new modes get sent to the
1304                  * link partner.
1305                  */
1306                 if (phydev->autoneg == AUTONEG_ENABLE) {
1307                         ret = phy_restart_aneg(phydev);
1308                         if (ret < 0)
1309                                 return ret;
1310                 }
1311         }
1312
1313         return 0;
1314 }
1315 EXPORT_SYMBOL(phy_ethtool_set_eee);
1316
1317 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1318 {
1319         if (phydev->drv && phydev->drv->set_wol)
1320                 return phydev->drv->set_wol(phydev, wol);
1321
1322         return -EOPNOTSUPP;
1323 }
1324 EXPORT_SYMBOL(phy_ethtool_set_wol);
1325
1326 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1327 {
1328         if (phydev->drv && phydev->drv->get_wol)
1329                 phydev->drv->get_wol(phydev, wol);
1330 }
1331 EXPORT_SYMBOL(phy_ethtool_get_wol);
1332
1333 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1334                                    struct ethtool_link_ksettings *cmd)
1335 {
1336         struct phy_device *phydev = ndev->phydev;
1337
1338         if (!phydev)
1339                 return -ENODEV;
1340
1341         phy_ethtool_ksettings_get(phydev, cmd);
1342
1343         return 0;
1344 }
1345 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1346
1347 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1348                                    const struct ethtool_link_ksettings *cmd)
1349 {
1350         struct phy_device *phydev = ndev->phydev;
1351
1352         if (!phydev)
1353                 return -ENODEV;
1354
1355         return phy_ethtool_ksettings_set(phydev, cmd);
1356 }
1357 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1358
1359 int phy_ethtool_nway_reset(struct net_device *ndev)
1360 {
1361         struct phy_device *phydev = ndev->phydev;
1362
1363         if (!phydev)
1364                 return -ENODEV;
1365
1366         if (!phydev->drv)
1367                 return -EIO;
1368
1369         return phy_restart_aneg(phydev);
1370 }
1371 EXPORT_SYMBOL(phy_ethtool_nway_reset);