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/timer.h>
  34 #include <linux/workqueue.h>
  35 #include <linux/mdio.h>
  36 #include <linux/io.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/atomic.h>
  39
  40 #include <asm/irq.h>
  41
  42 static const char *phy_speed_to_str(int speed)
  43 {
  44         switch (speed) {
  45         case SPEED_10:
  46                 return "10Mbps";
  47         case SPEED_100:
  48                 return "100Mbps";
  49         case SPEED_1000:
  50                 return "1Gbps";
  51         case SPEED_2500:
  52                 return "2.5Gbps";
  53         case SPEED_5000:
  54                 return "5Gbps";
  55         case SPEED_10000:
  56                 return "10Gbps";
  57         case SPEED_20000:
  58                 return "20Gbps";
  59         case SPEED_25000:
  60                 return "25Gbps";
  61         case SPEED_40000:
  62                 return "40Gbps";
  63         case SPEED_50000:
  64                 return "50Gbps";
  65         case SPEED_56000:
  66                 return "56Gbps";
  67         case SPEED_100000:
  68                 return "100Gbps";
  69         case SPEED_UNKNOWN:
  70                 return "Unknown";
  71         default:
  72                 return "Unsupported (update phy.c)";
  73         }
  74 }
  75
  76 #define PHY_STATE_STR(_state)                   \
  77         case PHY_##_state:                      \
  78                 return __stringify(_state);     \
  79
  80 static const char *phy_state_to_str(enum phy_state st)
  81 {
  82         switch (st) {
  83         PHY_STATE_STR(DOWN)
  84         PHY_STATE_STR(STARTING)
  85         PHY_STATE_STR(READY)
  86         PHY_STATE_STR(PENDING)
  87         PHY_STATE_STR(UP)
  88         PHY_STATE_STR(AN)
  89         PHY_STATE_STR(RUNNING)
  90         PHY_STATE_STR(NOLINK)
  91         PHY_STATE_STR(FORCING)
  92         PHY_STATE_STR(CHANGELINK)
  93         PHY_STATE_STR(HALTED)
  94         PHY_STATE_STR(RESUMING)
  95         }
  96
  97         return NULL;
  98 }
  99
 100
 101 /**
 102  * phy_print_status - Convenience function to print out the current phy status
 103  * @phydev: the phy_device struct
 104  */
 105 void phy_print_status(struct phy_device *phydev)
 106 {
 107         if (phydev->link) {
 108                 netdev_info(phydev->attached_dev,
 109                         "Link is Up - %s/%s - flow control %s\n",
 110                         phy_speed_to_str(phydev->speed),
 111                         DUPLEX_FULL == phydev->duplex ? "Full" : "Half",
 112                         phydev->pause ? "rx/tx" : "off");
 113         } else  {
 114                 netdev_info(phydev->attached_dev, "Link is Down\n");
 115         }
 116 }
 117 EXPORT_SYMBOL(phy_print_status);
 118
 119 /**
 120  * phy_clear_interrupt - Ack the phy device's interrupt
 121  * @phydev: the phy_device struct
 122  *
 123  * If the @phydev driver has an ack_interrupt function, call it to
 124  * ack and clear the phy device's interrupt.
 125  *
 126  * Returns 0 on success or < 0 on error.
 127  */
 128 static int phy_clear_interrupt(struct phy_device *phydev)
 129 {
 130         if (phydev->drv->ack_interrupt)
 131                 return phydev->drv->ack_interrupt(phydev);
 132
 133         return 0;
 134 }
 135
 136 /**
 137  * phy_config_interrupt - configure the PHY device for the requested interrupts
 138  * @phydev: the phy_device struct
 139  * @interrupts: interrupt flags to configure for this @phydev
 140  *
 141  * Returns 0 on success or < 0 on error.
 142  */
 143 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 144 {
 145         phydev->interrupts = interrupts;
 146         if (phydev->drv->config_intr)
 147                 return phydev->drv->config_intr(phydev);
 148
 149         return 0;
 150 }
 151
 152 /**
 153  * phy_restart_aneg - restart auto-negotiation
 154  * @phydev: target phy_device struct
 155  *
 156  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
 157  * negative errno on error.
 158  */
 159 int phy_restart_aneg(struct phy_device *phydev)
 160 {
 161         int ret;
 162
 163         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 164                 ret = genphy_c45_restart_aneg(phydev);
 165         else
 166                 ret = genphy_restart_aneg(phydev);
 167
 168         return ret;
 169 }
 170 EXPORT_SYMBOL_GPL(phy_restart_aneg);
 171
 172 /**
 173  * phy_aneg_done - return auto-negotiation status
 174  * @phydev: target phy_device struct
 175  *
 176  * Description: Return the auto-negotiation status from this @phydev
 177  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 178  * is still pending.
 179  */
 180 int phy_aneg_done(struct phy_device *phydev)
 181 {
 182         if (phydev->drv && phydev->drv->aneg_done)
 183                 return phydev->drv->aneg_done(phydev);
 184
 185         /* Avoid genphy_aneg_done() if the Clause 45 PHY does not
 186          * implement Clause 22 registers
 187          */
 188         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 189                 return -EINVAL;
 190
 191         return genphy_aneg_done(phydev);
 192 }
 193 EXPORT_SYMBOL(phy_aneg_done);
 194
 195 /* A structure for mapping a particular speed and duplex
 196  * combination to a particular SUPPORTED and ADVERTISED value
 197  */
 198 struct phy_setting {
 199         int speed;
 200         int duplex;
 201         u32 setting;
 202 };
 203
 204 /* A mapping of all SUPPORTED settings to speed/duplex.  This table
 205  * must be grouped by speed and sorted in descending match priority
 206  * - iow, descending speed. */
 207 static const struct phy_setting settings[] = {
 208         {
 209                 .speed = SPEED_10000,
 210                 .duplex = DUPLEX_FULL,
 211                 .setting = SUPPORTED_10000baseKR_Full,
 212         },
 213         {
 214                 .speed = SPEED_10000,
 215                 .duplex = DUPLEX_FULL,
 216                 .setting = SUPPORTED_10000baseKX4_Full,
 217         },
 218         {
 219                 .speed = SPEED_10000,
 220                 .duplex = DUPLEX_FULL,
 221                 .setting = SUPPORTED_10000baseT_Full,
 222         },
 223         {
 224                 .speed = SPEED_2500,
 225                 .duplex = DUPLEX_FULL,
 226                 .setting = SUPPORTED_2500baseX_Full,
 227         },
 228         {
 229                 .speed = SPEED_1000,
 230                 .duplex = DUPLEX_FULL,
 231                 .setting = SUPPORTED_1000baseKX_Full,
 232         },
 233         {
 234                 .speed = SPEED_1000,
 235                 .duplex = DUPLEX_FULL,
 236                 .setting = SUPPORTED_1000baseT_Full,
 237         },
 238         {
 239                 .speed = SPEED_1000,
 240                 .duplex = DUPLEX_HALF,
 241                 .setting = SUPPORTED_1000baseT_Half,
 242         },
 243         {
 244                 .speed = SPEED_100,
 245                 .duplex = DUPLEX_FULL,
 246                 .setting = SUPPORTED_100baseT_Full,
 247         },
 248         {
 249                 .speed = SPEED_100,
 250                 .duplex = DUPLEX_HALF,
 251                 .setting = SUPPORTED_100baseT_Half,
 252         },
 253         {
 254                 .speed = SPEED_10,
 255                 .duplex = DUPLEX_FULL,
 256                 .setting = SUPPORTED_10baseT_Full,
 257         },
 258         {
 259                 .speed = SPEED_10,
 260                 .duplex = DUPLEX_HALF,
 261                 .setting = SUPPORTED_10baseT_Half,
 262         },
 263 };
 264
 265 /**
 266  * phy_lookup_setting - lookup a PHY setting
 267  * @speed: speed to match
 268  * @duplex: duplex to match
 269  * @feature: allowed link modes
 270  * @exact: an exact match is required
 271  *
 272  * Search the settings array for a setting that matches the speed and
 273  * duplex, and which is supported.
 274  *
 275  * If @exact is unset, either an exact match or %NULL for no match will
 276  * be returned.
 277  *
 278  * If @exact is set, an exact match, the fastest supported setting at
 279  * or below the specified speed, the slowest supported setting, or if
 280  * they all fail, %NULL will be returned.
 281  */
 282 static const struct phy_setting *
 283 phy_lookup_setting(int speed, int duplex, u32 features, bool exact)
 284 {
 285         const struct phy_setting *p, *match = NULL, *last = NULL;
 286         int i;
 287
 288         for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
 289                 if (p->setting & features) {
 290                         last = p;
 291                         if (p->speed == speed && p->duplex == duplex) {
 292                                 /* Exact match for speed and duplex */
 293                                 match = p;
 294                                 break;
 295                         } else if (!exact) {
 296                                 if (!match && p->speed <= speed)
 297                                         /* Candidate */
 298                                         match = p;
 299
 300                                 if (p->speed < speed)
 301                                         break;
 302                         }
 303                 }
 304         }
 305
 306         if (!match && !exact)
 307                 match = last;
 308
 309         return match;
 310 }
 311
 312 /**
 313  * phy_find_valid - find a PHY setting that matches the requested parameters
 314  * @speed: desired speed
 315  * @duplex: desired duplex
 316  * @supported: mask of supported link modes
 317  *
 318  * Locate a supported phy setting that is, in priority order:
 319  * - an exact match for the specified speed and duplex mode
 320  * - a match for the specified speed, or slower speed
 321  * - the slowest supported speed
 322  * Returns the matched phy_setting entry, or %NULL if no supported phy
 323  * settings were found.
 324  */
 325 static const struct phy_setting *
 326 phy_find_valid(int speed, int duplex, u32 supported)
 327 {
 328         return phy_lookup_setting(speed, duplex, supported, false);
 329 }
 330
 331 /**
 332  * phy_supported_speeds - return all speeds currently supported by a phy device
 333  * @phy: The phy device to return supported speeds of.
 334  * @speeds: buffer to store supported speeds in.
 335  * @size:   size of speeds buffer.
 336  *
 337  * Description: Returns the number of supported speeds, and fills the speeds
 338  * buffer with the supported speeds. If speeds buffer is too small to contain
 339  * all currently supported speeds, will return as many speeds as can fit.
 340  */
 341 unsigned int phy_supported_speeds(struct phy_device *phy,
 342                                   unsigned int *speeds,
 343                                   unsigned int size)
 344 {
 345         unsigned int count = 0;
 346         unsigned int idx = 0;
 347
 348         for (idx = 0; idx < ARRAY_SIZE(settings) && count < size; idx++)
 349                 /* Assumes settings are grouped by speed */
 350                 if ((settings[idx].setting & phy->supported) &&
 351                     (count == 0 || speeds[count - 1] != settings[idx].speed))
 352                         speeds[count++] = settings[idx].speed;
 353
 354         return count;
 355 }
 356
 357 /**
 358  * phy_check_valid - check if there is a valid PHY setting which matches
 359  *                   speed, duplex, and feature mask
 360  * @speed: speed to match
 361  * @duplex: duplex to match
 362  * @features: A mask of the valid settings
 363  *
 364  * Description: Returns true if there is a valid setting, false otherwise.
 365  */
 366 static inline bool phy_check_valid(int speed, int duplex, u32 features)
 367 {
 368         return !!phy_lookup_setting(speed, duplex, features, true);
 369 }
 370
 371 /**
 372  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 373  * @phydev: the target phy_device struct
 374  *
 375  * Description: Make sure the PHY is set to supported speeds and
 376  *   duplexes.  Drop down by one in this order:  1000/FULL,
 377  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 378  */
 379 static void phy_sanitize_settings(struct phy_device *phydev)
 380 {
 381         const struct phy_setting *setting;
 382         u32 features = phydev->supported;
 383
 384         /* Sanitize settings based on PHY capabilities */
 385         if ((features & SUPPORTED_Autoneg) == 0)
 386                 phydev->autoneg = AUTONEG_DISABLE;
 387
 388         setting = phy_find_valid(phydev->speed, phydev->duplex, features);
 389         if (setting) {
 390                 phydev->speed = setting->speed;
 391                 phydev->duplex = setting->duplex;
 392         } else {
 393                 /* We failed to find anything (no supported speeds?) */
 394                 phydev->speed = SPEED_UNKNOWN;
 395                 phydev->duplex = DUPLEX_UNKNOWN;
 396         }
 397 }
 398
 399 /**
 400  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 401  * @phydev: target phy_device struct
 402  * @cmd: ethtool_cmd
 403  *
 404  * A few notes about parameter checking:
 405  * - We don't set port or transceiver, so we don't care what they
 406  *   were set to.
 407  * - phy_start_aneg() will make sure forced settings are sane, and
 408  *   choose the next best ones from the ones selected, so we don't
 409  *   care if ethtool tries to give us bad values.
 410  */
 411 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 412 {
 413         u32 speed = ethtool_cmd_speed(cmd);
 414
 415         if (cmd->phy_address != phydev->mdio.addr)
 416                 return -EINVAL;
 417
 418         /* We make sure that we don't pass unsupported values in to the PHY */
 419         cmd->advertising &= phydev->supported;
 420
 421         /* Verify the settings we care about. */
 422         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 423                 return -EINVAL;
 424
 425         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 426                 return -EINVAL;
 427
 428         if (cmd->autoneg == AUTONEG_DISABLE &&
 429             ((speed != SPEED_1000 &&
 430               speed != SPEED_100 &&
 431               speed != SPEED_10) ||
 432              (cmd->duplex != DUPLEX_HALF &&
 433               cmd->duplex != DUPLEX_FULL)))
 434                 return -EINVAL;
 435
 436         phydev->autoneg = cmd->autoneg;
 437
 438         phydev->speed = speed;
 439
 440         phydev->advertising = cmd->advertising;
 441
 442         if (AUTONEG_ENABLE == cmd->autoneg)
 443                 phydev->advertising |= ADVERTISED_Autoneg;
 444         else
 445                 phydev->advertising &= ~ADVERTISED_Autoneg;
 446
 447         phydev->duplex = cmd->duplex;
 448
 449         phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
 450
 451         /* Restart the PHY */
 452         phy_start_aneg(phydev);
 453
 454         return 0;
 455 }
 456 EXPORT_SYMBOL(phy_ethtool_sset);
 457
 458 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 459                               const struct ethtool_link_ksettings *cmd)
 460 {
 461         u8 autoneg = cmd->base.autoneg;
 462         u8 duplex = cmd->base.duplex;
 463         u32 speed = cmd->base.speed;
 464         u32 advertising;
 465
 466         if (cmd->base.phy_address != phydev->mdio.addr)
 467                 return -EINVAL;
 468
 469         ethtool_convert_link_mode_to_legacy_u32(&advertising,
 470                                                 cmd->link_modes.advertising);
 471
 472         /* We make sure that we don't pass unsupported values in to the PHY */
 473         advertising &= phydev->supported;
 474
 475         /* Verify the settings we care about. */
 476         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 477                 return -EINVAL;
 478
 479         if (autoneg == AUTONEG_ENABLE && advertising == 0)
 480                 return -EINVAL;
 481
 482         if (autoneg == AUTONEG_DISABLE &&
 483             ((speed != SPEED_1000 &&
 484               speed != SPEED_100 &&
 485               speed != SPEED_10) ||
 486              (duplex != DUPLEX_HALF &&
 487               duplex != DUPLEX_FULL)))
 488                 return -EINVAL;
 489
 490         phydev->autoneg = autoneg;
 491
 492         phydev->speed = speed;
 493
 494         phydev->advertising = advertising;
 495
 496         if (autoneg == AUTONEG_ENABLE)
 497                 phydev->advertising |= ADVERTISED_Autoneg;
 498         else
 499                 phydev->advertising &= ~ADVERTISED_Autoneg;
 500
 501         phydev->duplex = duplex;
 502
 503         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 504
 505         /* Restart the PHY */
 506         phy_start_aneg(phydev);
 507
 508         return 0;
 509 }
 510 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 511
 512 int phy_ethtool_ksettings_get(struct phy_device *phydev,
 513                               struct ethtool_link_ksettings *cmd)
 514 {
 515         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 516                                                 phydev->supported);
 517
 518         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 519                                                 phydev->advertising);
 520
 521         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
 522                                                 phydev->lp_advertising);
 523
 524         cmd->base.speed = phydev->speed;
 525         cmd->base.duplex = phydev->duplex;
 526         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 527                 cmd->base.port = PORT_BNC;
 528         else
 529                 cmd->base.port = PORT_MII;
 530
 531         cmd->base.phy_address = phydev->mdio.addr;
 532         cmd->base.autoneg = phydev->autoneg;
 533         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 534         cmd->base.eth_tp_mdix = phydev->mdix;
 535
 536         return 0;
 537 }
 538 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 539
 540 /**
 541  * phy_mii_ioctl - generic PHY MII ioctl interface
 542  * @phydev: the phy_device struct
 543  * @ifr: &struct ifreq for socket ioctl's
 544  * @cmd: ioctl cmd to execute
 545  *
 546  * Note that this function is currently incompatible with the
 547  * PHYCONTROL layer.  It changes registers without regard to
 548  * current state.  Use at own risk.
 549  */
 550 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 551 {
 552         struct mii_ioctl_data *mii_data = if_mii(ifr);
 553         u16 val = mii_data->val_in;
 554         bool change_autoneg = false;
 555
 556         switch (cmd) {
 557         case SIOCGMIIPHY:
 558                 mii_data->phy_id = phydev->mdio.addr;
 559                 /* fall through */
 560
 561         case SIOCGMIIREG:
 562                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 563                                                  mii_data->phy_id,
 564                                                  mii_data->reg_num);
 565                 return 0;
 566
 567         case SIOCSMIIREG:
 568                 if (mii_data->phy_id == phydev->mdio.addr) {
 569                         switch (mii_data->reg_num) {
 570                         case MII_BMCR:
 571                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 572                                         if (phydev->autoneg == AUTONEG_ENABLE)
 573                                                 change_autoneg = true;
 574                                         phydev->autoneg = AUTONEG_DISABLE;
 575                                         if (val & BMCR_FULLDPLX)
 576                                                 phydev->duplex = DUPLEX_FULL;
 577                                         else
 578                                                 phydev->duplex = DUPLEX_HALF;
 579                                         if (val & BMCR_SPEED1000)
 580                                                 phydev->speed = SPEED_1000;
 581                                         else if (val & BMCR_SPEED100)
 582                                                 phydev->speed = SPEED_100;
 583                                         else phydev->speed = SPEED_10;
 584                                 }
 585                                 else {
 586                                         if (phydev->autoneg == AUTONEG_DISABLE)
 587                                                 change_autoneg = true;
 588                                         phydev->autoneg = AUTONEG_ENABLE;
 589                                 }
 590                                 break;
 591                         case MII_ADVERTISE:
 592                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 593                                 change_autoneg = true;
 594                                 break;
 595                         default:
 596                                 /* do nothing */
 597                                 break;
 598                         }
 599                 }
 600
 601                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 602                               mii_data->reg_num, val);
 603
 604                 if (mii_data->phy_id == phydev->mdio.addr &&
 605                     mii_data->reg_num == MII_BMCR &&
 606                     val & BMCR_RESET)
 607                         return phy_init_hw(phydev);
 608
 609                 if (change_autoneg)
 610                         return phy_start_aneg(phydev);
 611
 612                 return 0;
 613
 614         case SIOCSHWTSTAMP:
 615                 if (phydev->drv && phydev->drv->hwtstamp)
 616                         return phydev->drv->hwtstamp(phydev, ifr);
 617                 /* fall through */
 618
 619         default:
 620                 return -EOPNOTSUPP;
 621         }
 622 }
 623 EXPORT_SYMBOL(phy_mii_ioctl);
 624
 625 /**
 626  * phy_start_aneg_priv - start auto-negotiation for this PHY device
 627  * @phydev: the phy_device struct
 628  * @sync: indicate whether we should wait for the workqueue cancelation
 629  *
 630  * Description: Sanitizes the settings (if we're not autonegotiating
 631  *   them), and then calls the driver's config_aneg function.
 632  *   If the PHYCONTROL Layer is operating, we change the state to
 633  *   reflect the beginning of Auto-negotiation or forcing.
 634  */
 635 static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 636 {
 637         bool trigger = 0;
 638         int err;
 639
 640         if (!phydev->drv)
 641                 return -EIO;
 642
 643         mutex_lock(&phydev->lock);
 644
 645         if (AUTONEG_DISABLE == phydev->autoneg)
 646                 phy_sanitize_settings(phydev);
 647
 648         /* Invalidate LP advertising flags */
 649         phydev->lp_advertising = 0;
 650
 651         err = phydev->drv->config_aneg(phydev);
 652         if (err < 0)
 653                 goto out_unlock;
 654
 655         if (phydev->state != PHY_HALTED) {
 656                 if (AUTONEG_ENABLE == phydev->autoneg) {
 657                         phydev->state = PHY_AN;
 658                         phydev->link_timeout = PHY_AN_TIMEOUT;
 659                 } else {
 660                         phydev->state = PHY_FORCING;
 661                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 662                 }
 663         }
 664
 665         /* Re-schedule a PHY state machine to check PHY status because
 666          * negotiation may already be done and aneg interrupt may not be
 667          * generated.
 668          */
 669         if (phy_interrupt_is_valid(phydev) && (phydev->state == PHY_AN)) {
 670                 err = phy_aneg_done(phydev);
 671                 if (err > 0) {
 672                         trigger = true;
 673                         err = 0;
 674                 }
 675         }
 676
 677 out_unlock:
 678         mutex_unlock(&phydev->lock);
 679
 680         if (trigger)
 681                 phy_trigger_machine(phydev, sync);
 682
 683         return err;
 684 }
 685
 686 /**
 687  * phy_start_aneg - start auto-negotiation for this PHY device
 688  * @phydev: the phy_device struct
 689  *
 690  * Description: Sanitizes the settings (if we're not autonegotiating
 691  *   them), and then calls the driver's config_aneg function.
 692  *   If the PHYCONTROL Layer is operating, we change the state to
 693  *   reflect the beginning of Auto-negotiation or forcing.
 694  */
 695 int phy_start_aneg(struct phy_device *phydev)
 696 {
 697         return phy_start_aneg_priv(phydev, true);
 698 }
 699 EXPORT_SYMBOL(phy_start_aneg);
 700
 701 /**
 702  * phy_start_machine - start PHY state machine tracking
 703  * @phydev: the phy_device struct
 704  *
 705  * Description: The PHY infrastructure can run a state machine
 706  *   which tracks whether the PHY is starting up, negotiating,
 707  *   etc.  This function starts the timer which tracks the state
 708  *   of the PHY.  If you want to maintain your own state machine,
 709  *   do not call this function.
 710  */
 711 void phy_start_machine(struct phy_device *phydev)
 712 {
 713         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 714 }
 715
 716 /**
 717  * phy_trigger_machine - trigger the state machine to run
 718  *
 719  * @phydev: the phy_device struct
 720  * @sync: indicate whether we should wait for the workqueue cancelation
 721  *
 722  * Description: There has been a change in state which requires that the
 723  *   state machine runs.
 724  */
 725
 726 void phy_trigger_machine(struct phy_device *phydev, bool sync)
 727 {
 728         if (sync)
 729                 cancel_delayed_work_sync(&phydev->state_queue);
 730         else
 731                 cancel_delayed_work(&phydev->state_queue);
 732         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 733 }
 734
 735 /**
 736  * phy_stop_machine - stop the PHY state machine tracking
 737  * @phydev: target phy_device struct
 738  *
 739  * Description: Stops the state machine timer, sets the state to UP
 740  *   (unless it wasn't up yet). This function must be called BEFORE
 741  *   phy_detach.
 742  */
 743 void phy_stop_machine(struct phy_device *phydev)
 744 {
 745         cancel_delayed_work_sync(&phydev->state_queue);
 746
 747         mutex_lock(&phydev->lock);
 748         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 749                 phydev->state = PHY_UP;
 750         mutex_unlock(&phydev->lock);
 751 }
 752
 753 /**
 754  * phy_error - enter HALTED state for this PHY device
 755  * @phydev: target phy_device struct
 756  *
 757  * Moves the PHY to the HALTED state in response to a read
 758  * or write error, and tells the controller the link is down.
 759  * Must not be called from interrupt context, or while the
 760  * phydev->lock is held.
 761  */
 762 static void phy_error(struct phy_device *phydev)
 763 {
 764         mutex_lock(&phydev->lock);
 765         phydev->state = PHY_HALTED;
 766         mutex_unlock(&phydev->lock);
 767
 768         phy_trigger_machine(phydev, false);
 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         disable_irq_nosync(irq);
 787         atomic_inc(&phydev->irq_disable);
 788
 789         phy_change(phydev);
 790
 791         return IRQ_HANDLED;
 792 }
 793
 794 /**
 795  * phy_enable_interrupts - Enable the interrupts from the PHY side
 796  * @phydev: target phy_device struct
 797  */
 798 static int phy_enable_interrupts(struct phy_device *phydev)
 799 {
 800         int err = phy_clear_interrupt(phydev);
 801
 802         if (err < 0)
 803                 return err;
 804
 805         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 806 }
 807
 808 /**
 809  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 810  * @phydev: target phy_device struct
 811  */
 812 static int phy_disable_interrupts(struct phy_device *phydev)
 813 {
 814         int err;
 815
 816         /* Disable PHY interrupts */
 817         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 818         if (err)
 819                 goto phy_err;
 820
 821         /* Clear the interrupt */
 822         err = phy_clear_interrupt(phydev);
 823         if (err)
 824                 goto phy_err;
 825
 826         return 0;
 827
 828 phy_err:
 829         phy_error(phydev);
 830
 831         return err;
 832 }
 833
 834 /**
 835  * phy_start_interrupts - request and enable interrupts for a PHY device
 836  * @phydev: target phy_device struct
 837  *
 838  * Description: Request the interrupt for the given PHY.
 839  *   If this fails, then we set irq to PHY_POLL.
 840  *   Otherwise, we enable the interrupts in the PHY.
 841  *   This should only be called with a valid IRQ number.
 842  *   Returns 0 on success or < 0 on error.
 843  */
 844 int phy_start_interrupts(struct phy_device *phydev)
 845 {
 846         atomic_set(&phydev->irq_disable, 0);
 847         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 848                                  IRQF_ONESHOT | IRQF_SHARED,
 849                                  phydev_name(phydev), phydev) < 0) {
 850                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 851                         phydev->mdio.bus->name, phydev->irq);
 852                 phydev->irq = PHY_POLL;
 853                 return 0;
 854         }
 855
 856         return phy_enable_interrupts(phydev);
 857 }
 858 EXPORT_SYMBOL(phy_start_interrupts);
 859
 860 /**
 861  * phy_stop_interrupts - disable interrupts from a PHY device
 862  * @phydev: target phy_device struct
 863  */
 864 int phy_stop_interrupts(struct phy_device *phydev)
 865 {
 866         int err = phy_disable_interrupts(phydev);
 867
 868         if (err)
 869                 phy_error(phydev);
 870
 871         free_irq(phydev->irq, phydev);
 872
 873         /* If work indeed has been cancelled, disable_irq() will have
 874          * been left unbalanced from phy_interrupt() and enable_irq()
 875          * has to be called so that other devices on the line work.
 876          */
 877         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 878                 enable_irq(phydev->irq);
 879
 880         return err;
 881 }
 882 EXPORT_SYMBOL(phy_stop_interrupts);
 883
 884 /**
 885  * phy_change - Called by the phy_interrupt to handle PHY changes
 886  * @phydev: phy_device struct that interrupted
 887  */
 888 void phy_change(struct phy_device *phydev)
 889 {
 890         if (phy_interrupt_is_valid(phydev)) {
 891                 if (phydev->drv->did_interrupt &&
 892                     !phydev->drv->did_interrupt(phydev))
 893                         goto ignore;
 894
 895                 if (phy_disable_interrupts(phydev))
 896                         goto phy_err;
 897         }
 898
 899         mutex_lock(&phydev->lock);
 900         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 901                 phydev->state = PHY_CHANGELINK;
 902         mutex_unlock(&phydev->lock);
 903
 904         if (phy_interrupt_is_valid(phydev)) {
 905                 atomic_dec(&phydev->irq_disable);
 906                 enable_irq(phydev->irq);
 907
 908                 /* Reenable interrupts */
 909                 if (PHY_HALTED != phydev->state &&
 910                     phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 911                         goto irq_enable_err;
 912         }
 913
 914         /* reschedule state queue work to run as soon as possible */
 915         phy_trigger_machine(phydev, true);
 916         return;
 917
 918 ignore:
 919         atomic_dec(&phydev->irq_disable);
 920         enable_irq(phydev->irq);
 921         return;
 922
 923 irq_enable_err:
 924         disable_irq(phydev->irq);
 925         atomic_inc(&phydev->irq_disable);
 926 phy_err:
 927         phy_error(phydev);
 928 }
 929
 930 /**
 931  * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
 932  * @work: work_struct that describes the work to be done
 933  */
 934 void phy_change_work(struct work_struct *work)
 935 {
 936         struct phy_device *phydev =
 937                 container_of(work, struct phy_device, phy_queue);
 938
 939         phy_change(phydev);
 940 }
 941
 942 /**
 943  * phy_stop - Bring down the PHY link, and stop checking the status
 944  * @phydev: target phy_device struct
 945  */
 946 void phy_stop(struct phy_device *phydev)
 947 {
 948         mutex_lock(&phydev->lock);
 949
 950         if (PHY_HALTED == phydev->state)
 951                 goto out_unlock;
 952
 953         if (phy_interrupt_is_valid(phydev)) {
 954                 /* Disable PHY Interrupts */
 955                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 956
 957                 /* Clear any pending interrupts */
 958                 phy_clear_interrupt(phydev);
 959         }
 960
 961         phydev->state = PHY_HALTED;
 962
 963 out_unlock:
 964         mutex_unlock(&phydev->lock);
 965
 966         /* Cannot call flush_scheduled_work() here as desired because
 967          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 968          * will not reenable interrupts.
 969          */
 970 }
 971 EXPORT_SYMBOL(phy_stop);
 972
 973 /**
 974  * phy_start - start or restart a PHY device
 975  * @phydev: target phy_device struct
 976  *
 977  * Description: Indicates the attached device's readiness to
 978  *   handle PHY-related work.  Used during startup to start the
 979  *   PHY, and after a call to phy_stop() to resume operation.
 980  *   Also used to indicate the MDIO bus has cleared an error
 981  *   condition.
 982  */
 983 void phy_start(struct phy_device *phydev)
 984 {
 985         bool do_resume = false;
 986         int err = 0;
 987
 988         mutex_lock(&phydev->lock);
 989
 990         switch (phydev->state) {
 991         case PHY_STARTING:
 992                 phydev->state = PHY_PENDING;
 993                 break;
 994         case PHY_READY:
 995                 phydev->state = PHY_UP;
 996                 break;
 997         case PHY_HALTED:
 998                 /* make sure interrupts are re-enabled for the PHY */
 999                 if (phydev->irq != PHY_POLL) {
1000                         err = phy_enable_interrupts(phydev);
1001                         if (err < 0)
1002                                 break;
1003                 }
1004
1005                 phydev->state = PHY_RESUMING;
1006                 do_resume = true;
1007                 break;
1008         default:
1009                 break;
1010         }
1011         mutex_unlock(&phydev->lock);
1012
1013         /* if phy was suspended, bring the physical link up again */
1014         if (do_resume)
1015                 phy_resume(phydev);
1016
1017         phy_trigger_machine(phydev, true);
1018 }
1019 EXPORT_SYMBOL(phy_start);
1020
1021 static void phy_adjust_link(struct phy_device *phydev)
1022 {
1023         phydev->adjust_link(phydev->attached_dev);
1024         phy_led_trigger_change_speed(phydev);
1025 }
1026
1027 /**
1028  * phy_state_machine - Handle the state machine
1029  * @work: work_struct that describes the work to be done
1030  */
1031 void phy_state_machine(struct work_struct *work)
1032 {
1033         struct delayed_work *dwork = to_delayed_work(work);
1034         struct phy_device *phydev =
1035                         container_of(dwork, struct phy_device, state_queue);
1036         bool needs_aneg = false, do_suspend = false;
1037         enum phy_state old_state;
1038         int err = 0;
1039         int old_link;
1040
1041         mutex_lock(&phydev->lock);
1042
1043         old_state = phydev->state;
1044
1045         if (phydev->drv && phydev->drv->link_change_notify)
1046                 phydev->drv->link_change_notify(phydev);
1047
1048         switch (phydev->state) {
1049         case PHY_DOWN:
1050         case PHY_STARTING:
1051         case PHY_READY:
1052         case PHY_PENDING:
1053                 break;
1054         case PHY_UP:
1055                 needs_aneg = true;
1056
1057                 phydev->link_timeout = PHY_AN_TIMEOUT;
1058
1059                 break;
1060         case PHY_AN:
1061                 err = phy_read_status(phydev);
1062                 if (err < 0)
1063                         break;
1064
1065                 /* If the link is down, give up on negotiation for now */
1066                 if (!phydev->link) {
1067                         phydev->state = PHY_NOLINK;
1068                         netif_carrier_off(phydev->attached_dev);
1069                         phy_adjust_link(phydev);
1070                         break;
1071                 }
1072
1073                 /* Check if negotiation is done.  Break if there's an error */
1074                 err = phy_aneg_done(phydev);
1075                 if (err < 0)
1076                         break;
1077
1078                 /* If AN is done, we're running */
1079                 if (err > 0) {
1080                         phydev->state = PHY_RUNNING;
1081                         netif_carrier_on(phydev->attached_dev);
1082                         phy_adjust_link(phydev);
1083
1084                 } else if (0 == phydev->link_timeout--)
1085                         needs_aneg = true;
1086                 break;
1087         case PHY_NOLINK:
1088                 if (phy_interrupt_is_valid(phydev))
1089                         break;
1090
1091                 err = phy_read_status(phydev);
1092                 if (err)
1093                         break;
1094
1095                 if (phydev->link) {
1096                         if (AUTONEG_ENABLE == phydev->autoneg) {
1097                                 err = phy_aneg_done(phydev);
1098                                 if (err < 0)
1099                                         break;
1100
1101                                 if (!err) {
1102                                         phydev->state = PHY_AN;
1103                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1104                                         break;
1105                                 }
1106                         }
1107                         phydev->state = PHY_RUNNING;
1108                         netif_carrier_on(phydev->attached_dev);
1109                         phy_adjust_link(phydev);
1110                 }
1111                 break;
1112         case PHY_FORCING:
1113                 err = genphy_update_link(phydev);
1114                 if (err)
1115                         break;
1116
1117                 if (phydev->link) {
1118                         phydev->state = PHY_RUNNING;
1119                         netif_carrier_on(phydev->attached_dev);
1120                 } else {
1121                         if (0 == phydev->link_timeout--)
1122                                 needs_aneg = true;
1123                 }
1124
1125                 phy_adjust_link(phydev);
1126                 break;
1127         case PHY_RUNNING:
1128                 /* Only register a CHANGE if we are polling and link changed
1129                  * since latest checking.
1130                  */
1131                 if (phydev->irq == PHY_POLL) {
1132                         old_link = phydev->link;
1133                         err = phy_read_status(phydev);
1134                         if (err)
1135                                 break;
1136
1137                         if (old_link != phydev->link)
1138                                 phydev->state = PHY_CHANGELINK;
1139                 }
1140                 /*
1141                  * Failsafe: check that nobody set phydev->link=0 between two
1142                  * poll cycles, otherwise we won't leave RUNNING state as long
1143                  * as link remains down.
1144                  */
1145                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1146                         phydev->state = PHY_CHANGELINK;
1147                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1148                 }
1149                 break;
1150         case PHY_CHANGELINK:
1151                 err = phy_read_status(phydev);
1152                 if (err)
1153                         break;
1154
1155                 if (phydev->link) {
1156                         phydev->state = PHY_RUNNING;
1157                         netif_carrier_on(phydev->attached_dev);
1158                 } else {
1159                         phydev->state = PHY_NOLINK;
1160                         netif_carrier_off(phydev->attached_dev);
1161                 }
1162
1163                 phy_adjust_link(phydev);
1164
1165                 if (phy_interrupt_is_valid(phydev))
1166                         err = phy_config_interrupt(phydev,
1167                                                    PHY_INTERRUPT_ENABLED);
1168                 break;
1169         case PHY_HALTED:
1170                 if (phydev->link) {
1171                         phydev->link = 0;
1172                         netif_carrier_off(phydev->attached_dev);
1173                         phy_adjust_link(phydev);
1174                         do_suspend = true;
1175                 }
1176                 break;
1177         case PHY_RESUMING:
1178                 if (AUTONEG_ENABLE == phydev->autoneg) {
1179                         err = phy_aneg_done(phydev);
1180                         if (err < 0)
1181                                 break;
1182
1183                         /* err > 0 if AN is done.
1184                          * Otherwise, it's 0, and we're  still waiting for AN
1185                          */
1186                         if (err > 0) {
1187                                 err = phy_read_status(phydev);
1188                                 if (err)
1189                                         break;
1190
1191                                 if (phydev->link) {
1192                                         phydev->state = PHY_RUNNING;
1193                                         netif_carrier_on(phydev->attached_dev);
1194                                 } else  {
1195                                         phydev->state = PHY_NOLINK;
1196                                 }
1197                                 phy_adjust_link(phydev);
1198                         } else {
1199                                 phydev->state = PHY_AN;
1200                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1201                         }
1202                 } else {
1203                         err = phy_read_status(phydev);
1204                         if (err)
1205                                 break;
1206
1207                         if (phydev->link) {
1208                                 phydev->state = PHY_RUNNING;
1209                                 netif_carrier_on(phydev->attached_dev);
1210                         } else  {
1211                                 phydev->state = PHY_NOLINK;
1212                         }
1213                         phy_adjust_link(phydev);
1214                 }
1215                 break;
1216         }
1217
1218         mutex_unlock(&phydev->lock);
1219
1220         if (needs_aneg)
1221                 err = phy_start_aneg_priv(phydev, false);
1222         else if (do_suspend)
1223                 phy_suspend(phydev);
1224
1225         if (err < 0)
1226                 phy_error(phydev);
1227
1228         phydev_dbg(phydev, "PHY state change %s -> %s\n",
1229                    phy_state_to_str(old_state),
1230                    phy_state_to_str(phydev->state));
1231
1232         /* Only re-schedule a PHY state machine change if we are polling the
1233          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1234          * between states from phy_mac_interrupt()
1235          */
1236         if (phydev->irq == PHY_POLL)
1237                 queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1238                                    PHY_STATE_TIME * HZ);
1239 }
1240
1241 /**
1242  * phy_mac_interrupt - MAC says the link has changed
1243  * @phydev: phy_device struct with changed link
1244  * @new_link: Link is Up/Down.
1245  *
1246  * Description: The MAC layer is able indicate there has been a change
1247  *   in the PHY link status. Set the new link status, and trigger the
1248  *   state machine, work a work queue.
1249  */
1250 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
1251 {
1252         phydev->link = new_link;
1253
1254         /* Trigger a state machine change */
1255         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1256 }
1257 EXPORT_SYMBOL(phy_mac_interrupt);
1258
1259 /**
1260  * phy_init_eee - init and check the EEE feature
1261  * @phydev: target phy_device struct
1262  * @clk_stop_enable: PHY may stop the clock during LPI
1263  *
1264  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1265  * is supported by looking at the MMD registers 3.20 and 7.60/61
1266  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1267  * bit if required.
1268  */
1269 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1270 {
1271         if (!phydev->drv)
1272                 return -EIO;
1273
1274         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1275          */
1276         if (phydev->duplex == DUPLEX_FULL) {
1277                 int eee_lp, eee_cap, eee_adv;
1278                 u32 lp, cap, adv;
1279                 int status;
1280
1281                 /* Read phy status to properly get the right settings */
1282                 status = phy_read_status(phydev);
1283                 if (status)
1284                         return status;
1285
1286                 /* First check if the EEE ability is supported */
1287                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1288                 if (eee_cap <= 0)
1289                         goto eee_exit_err;
1290
1291                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1292                 if (!cap)
1293                         goto eee_exit_err;
1294
1295                 /* Check which link settings negotiated and verify it in
1296                  * the EEE advertising registers.
1297                  */
1298                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1299                 if (eee_lp <= 0)
1300                         goto eee_exit_err;
1301
1302                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1303                 if (eee_adv <= 0)
1304                         goto eee_exit_err;
1305
1306                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1307                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1308                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1309                         goto eee_exit_err;
1310
1311                 if (clk_stop_enable) {
1312                         /* Configure the PHY to stop receiving xMII
1313                          * clock while it is signaling LPI.
1314                          */
1315                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1316                         if (val < 0)
1317                                 return val;
1318
1319                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1320                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1321                 }
1322
1323                 return 0; /* EEE supported */
1324         }
1325 eee_exit_err:
1326         return -EPROTONOSUPPORT;
1327 }
1328 EXPORT_SYMBOL(phy_init_eee);
1329
1330 /**
1331  * phy_get_eee_err - report the EEE wake error count
1332  * @phydev: target phy_device struct
1333  *
1334  * Description: it is to report the number of time where the PHY
1335  * failed to complete its normal wake sequence.
1336  */
1337 int phy_get_eee_err(struct phy_device *phydev)
1338 {
1339         if (!phydev->drv)
1340                 return -EIO;
1341
1342         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1343 }
1344 EXPORT_SYMBOL(phy_get_eee_err);
1345
1346 /**
1347  * phy_ethtool_get_eee - get EEE supported and status
1348  * @phydev: target phy_device struct
1349  * @data: ethtool_eee data
1350  *
1351  * Description: it reportes the Supported/Advertisement/LP Advertisement
1352  * capabilities.
1353  */
1354 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1355 {
1356         int val;
1357
1358         if (!phydev->drv)
1359                 return -EIO;
1360
1361         /* Get Supported EEE */
1362         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1363         if (val < 0)
1364                 return val;
1365         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1366
1367         /* Get advertisement EEE */
1368         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1369         if (val < 0)
1370                 return val;
1371         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1372
1373         /* Get LP advertisement EEE */
1374         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1375         if (val < 0)
1376                 return val;
1377         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1378
1379         return 0;
1380 }
1381 EXPORT_SYMBOL(phy_ethtool_get_eee);
1382
1383 /**
1384  * phy_ethtool_set_eee - set EEE supported and status
1385  * @phydev: target phy_device struct
1386  * @data: ethtool_eee data
1387  *
1388  * Description: it is to program the Advertisement EEE register.
1389  */
1390 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1391 {
1392         int cap, old_adv, adv, ret;
1393
1394         if (!phydev->drv)
1395                 return -EIO;
1396
1397         /* Get Supported EEE */
1398         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1399         if (cap < 0)
1400                 return cap;
1401
1402         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1403         if (old_adv < 0)
1404                 return old_adv;
1405
1406         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1407
1408         /* Mask prohibited EEE modes */
1409         adv &= ~phydev->eee_broken_modes;
1410
1411         if (old_adv != adv) {
1412                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1413                 if (ret < 0)
1414                         return ret;
1415
1416                 /* Restart autonegotiation so the new modes get sent to the
1417                  * link partner.
1418                  */
1419                 ret = phy_restart_aneg(phydev);
1420                 if (ret < 0)
1421                         return ret;
1422         }
1423
1424         return 0;
1425 }
1426 EXPORT_SYMBOL(phy_ethtool_set_eee);
1427
1428 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1429 {
1430         if (phydev->drv && phydev->drv->set_wol)
1431                 return phydev->drv->set_wol(phydev, wol);
1432
1433         return -EOPNOTSUPP;
1434 }
1435 EXPORT_SYMBOL(phy_ethtool_set_wol);
1436
1437 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1438 {
1439         if (phydev->drv && phydev->drv->get_wol)
1440                 phydev->drv->get_wol(phydev, wol);
1441 }
1442 EXPORT_SYMBOL(phy_ethtool_get_wol);
1443
1444 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1445                                    struct ethtool_link_ksettings *cmd)
1446 {
1447         struct phy_device *phydev = ndev->phydev;
1448
1449         if (!phydev)
1450                 return -ENODEV;
1451
1452         return phy_ethtool_ksettings_get(phydev, cmd);
1453 }
1454 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1455
1456 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1457                                    const struct ethtool_link_ksettings *cmd)
1458 {
1459         struct phy_device *phydev = ndev->phydev;
1460
1461         if (!phydev)
1462                 return -ENODEV;
1463
1464         return phy_ethtool_ksettings_set(phydev, cmd);
1465 }
1466 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1467
1468 int phy_ethtool_nway_reset(struct net_device *ndev)
1469 {
1470         struct phy_device *phydev = ndev->phydev;
1471
1472         if (!phydev)
1473                 return -ENODEV;
1474
1475         if (!phydev->drv)
1476                 return -EIO;
1477
1478         return phy_restart_aneg(phydev);
1479 }
1480 EXPORT_SYMBOL(phy_ethtool_nway_reset);