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_14000:
  58                 return "14Gbps";
  59         case SPEED_20000:
  60                 return "20Gbps";
  61         case SPEED_25000:
  62                 return "25Gbps";
  63         case SPEED_40000:
  64                 return "40Gbps";
  65         case SPEED_50000:
  66                 return "50Gbps";
  67         case SPEED_56000:
  68                 return "56Gbps";
  69         case SPEED_100000:
  70                 return "100Gbps";
  71         case SPEED_UNKNOWN:
  72                 return "Unknown";
  73         default:
  74                 return "Unsupported (update phy.c)";
  75         }
  76 }
  77
  78 #define PHY_STATE_STR(_state)                   \
  79         case PHY_##_state:                      \
  80                 return __stringify(_state);     \
  81
  82 static const char *phy_state_to_str(enum phy_state st)
  83 {
  84         switch (st) {
  85         PHY_STATE_STR(DOWN)
  86         PHY_STATE_STR(STARTING)
  87         PHY_STATE_STR(READY)
  88         PHY_STATE_STR(PENDING)
  89         PHY_STATE_STR(UP)
  90         PHY_STATE_STR(AN)
  91         PHY_STATE_STR(RUNNING)
  92         PHY_STATE_STR(NOLINK)
  93         PHY_STATE_STR(FORCING)
  94         PHY_STATE_STR(CHANGELINK)
  95         PHY_STATE_STR(HALTED)
  96         PHY_STATE_STR(RESUMING)
  97         }
  98
  99         return NULL;
 100 }
 101
 102
 103 /**
 104  * phy_print_status - Convenience function to print out the current phy status
 105  * @phydev: the phy_device struct
 106  */
 107 void phy_print_status(struct phy_device *phydev)
 108 {
 109         if (phydev->link) {
 110                 netdev_info(phydev->attached_dev,
 111                         "Link is Up - %s/%s - flow control %s\n",
 112                         phy_speed_to_str(phydev->speed),
 113                         DUPLEX_FULL == phydev->duplex ? "Full" : "Half",
 114                         phydev->pause ? "rx/tx" : "off");
 115         } else  {
 116                 netdev_info(phydev->attached_dev, "Link is Down\n");
 117         }
 118 }
 119 EXPORT_SYMBOL(phy_print_status);
 120
 121 /**
 122  * phy_clear_interrupt - Ack the phy device's interrupt
 123  * @phydev: the phy_device struct
 124  *
 125  * If the @phydev driver has an ack_interrupt function, call it to
 126  * ack and clear the phy device's interrupt.
 127  *
 128  * Returns 0 on success or < 0 on error.
 129  */
 130 static int phy_clear_interrupt(struct phy_device *phydev)
 131 {
 132         if (phydev->drv->ack_interrupt)
 133                 return phydev->drv->ack_interrupt(phydev);
 134
 135         return 0;
 136 }
 137
 138 /**
 139  * phy_config_interrupt - configure the PHY device for the requested interrupts
 140  * @phydev: the phy_device struct
 141  * @interrupts: interrupt flags to configure for this @phydev
 142  *
 143  * Returns 0 on success or < 0 on error.
 144  */
 145 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 146 {
 147         phydev->interrupts = interrupts;
 148         if (phydev->drv->config_intr)
 149                 return phydev->drv->config_intr(phydev);
 150
 151         return 0;
 152 }
 153
 154 /**
 155  * phy_restart_aneg - restart auto-negotiation
 156  * @phydev: target phy_device struct
 157  *
 158  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
 159  * negative errno on error.
 160  */
 161 int phy_restart_aneg(struct phy_device *phydev)
 162 {
 163         int ret;
 164
 165         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 166                 ret = genphy_c45_restart_aneg(phydev);
 167         else
 168                 ret = genphy_restart_aneg(phydev);
 169
 170         return ret;
 171 }
 172 EXPORT_SYMBOL_GPL(phy_restart_aneg);
 173
 174 /**
 175  * phy_aneg_done - return auto-negotiation status
 176  * @phydev: target phy_device struct
 177  *
 178  * Description: Return the auto-negotiation status from this @phydev
 179  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 180  * is still pending.
 181  */
 182 int phy_aneg_done(struct phy_device *phydev)
 183 {
 184         if (phydev->drv && phydev->drv->aneg_done)
 185                 return phydev->drv->aneg_done(phydev);
 186
 187         /* Avoid genphy_aneg_done() if the Clause 45 PHY does not
 188          * implement Clause 22 registers
 189          */
 190         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 191                 return -EINVAL;
 192
 193         return genphy_aneg_done(phydev);
 194 }
 195 EXPORT_SYMBOL(phy_aneg_done);
 196
 197 /* A structure for mapping a particular speed and duplex
 198  * combination to a particular SUPPORTED and ADVERTISED value
 199  */
 200 struct phy_setting {
 201         int speed;
 202         int duplex;
 203         u32 setting;
 204 };
 205
 206 /* A mapping of all SUPPORTED settings to speed/duplex.  This table
 207  * must be grouped by speed and sorted in descending match priority
 208  * - iow, descending speed. */
 209 static const struct phy_setting settings[] = {
 210         {
 211                 .speed = SPEED_10000,
 212                 .duplex = DUPLEX_FULL,
 213                 .setting = SUPPORTED_10000baseKR_Full,
 214         },
 215         {
 216                 .speed = SPEED_10000,
 217                 .duplex = DUPLEX_FULL,
 218                 .setting = SUPPORTED_10000baseKX4_Full,
 219         },
 220         {
 221                 .speed = SPEED_10000,
 222                 .duplex = DUPLEX_FULL,
 223                 .setting = SUPPORTED_10000baseT_Full,
 224         },
 225         {
 226                 .speed = SPEED_2500,
 227                 .duplex = DUPLEX_FULL,
 228                 .setting = SUPPORTED_2500baseX_Full,
 229         },
 230         {
 231                 .speed = SPEED_1000,
 232                 .duplex = DUPLEX_FULL,
 233                 .setting = SUPPORTED_1000baseKX_Full,
 234         },
 235         {
 236                 .speed = SPEED_1000,
 237                 .duplex = DUPLEX_FULL,
 238                 .setting = SUPPORTED_1000baseT_Full,
 239         },
 240         {
 241                 .speed = SPEED_1000,
 242                 .duplex = DUPLEX_HALF,
 243                 .setting = SUPPORTED_1000baseT_Half,
 244         },
 245         {
 246                 .speed = SPEED_100,
 247                 .duplex = DUPLEX_FULL,
 248                 .setting = SUPPORTED_100baseT_Full,
 249         },
 250         {
 251                 .speed = SPEED_100,
 252                 .duplex = DUPLEX_HALF,
 253                 .setting = SUPPORTED_100baseT_Half,
 254         },
 255         {
 256                 .speed = SPEED_10,
 257                 .duplex = DUPLEX_FULL,
 258                 .setting = SUPPORTED_10baseT_Full,
 259         },
 260         {
 261                 .speed = SPEED_10,
 262                 .duplex = DUPLEX_HALF,
 263                 .setting = SUPPORTED_10baseT_Half,
 264         },
 265 };
 266
 267 /**
 268  * phy_lookup_setting - lookup a PHY setting
 269  * @speed: speed to match
 270  * @duplex: duplex to match
 271  * @features: allowed link modes
 272  * @exact: an exact match is required
 273  *
 274  * Search the settings array for a setting that matches the speed and
 275  * duplex, and which is supported.
 276  *
 277  * If @exact is unset, either an exact match or %NULL for no match will
 278  * be returned.
 279  *
 280  * If @exact is set, an exact match, the fastest supported setting at
 281  * or below the specified speed, the slowest supported setting, or if
 282  * they all fail, %NULL will be returned.
 283  */
 284 static const struct phy_setting *
 285 phy_lookup_setting(int speed, int duplex, u32 features, bool exact)
 286 {
 287         const struct phy_setting *p, *match = NULL, *last = NULL;
 288         int i;
 289
 290         for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
 291                 if (p->setting & features) {
 292                         last = p;
 293                         if (p->speed == speed && p->duplex == duplex) {
 294                                 /* Exact match for speed and duplex */
 295                                 match = p;
 296                                 break;
 297                         } else if (!exact) {
 298                                 if (!match && p->speed <= speed)
 299                                         /* Candidate */
 300                                         match = p;
 301
 302                                 if (p->speed < speed)
 303                                         break;
 304                         }
 305                 }
 306         }
 307
 308         if (!match && !exact)
 309                 match = last;
 310
 311         return match;
 312 }
 313
 314 /**
 315  * phy_find_valid - find a PHY setting that matches the requested parameters
 316  * @speed: desired speed
 317  * @duplex: desired duplex
 318  * @supported: mask of supported link modes
 319  *
 320  * Locate a supported phy setting that is, in priority order:
 321  * - an exact match for the specified speed and duplex mode
 322  * - a match for the specified speed, or slower speed
 323  * - the slowest supported speed
 324  * Returns the matched phy_setting entry, or %NULL if no supported phy
 325  * settings were found.
 326  */
 327 static const struct phy_setting *
 328 phy_find_valid(int speed, int duplex, u32 supported)
 329 {
 330         return phy_lookup_setting(speed, duplex, supported, false);
 331 }
 332
 333 /**
 334  * phy_supported_speeds - return all speeds currently supported by a phy device
 335  * @phy: The phy device to return supported speeds of.
 336  * @speeds: buffer to store supported speeds in.
 337  * @size:   size of speeds buffer.
 338  *
 339  * Description: Returns the number of supported speeds, and fills the speeds
 340  * buffer with the supported speeds. If speeds buffer is too small to contain
 341  * all currently supported speeds, will return as many speeds as can fit.
 342  */
 343 unsigned int phy_supported_speeds(struct phy_device *phy,
 344                                   unsigned int *speeds,
 345                                   unsigned int size)
 346 {
 347         unsigned int count = 0;
 348         unsigned int idx = 0;
 349
 350         for (idx = 0; idx < ARRAY_SIZE(settings) && count < size; idx++)
 351                 /* Assumes settings are grouped by speed */
 352                 if ((settings[idx].setting & phy->supported) &&
 353                     (count == 0 || speeds[count - 1] != settings[idx].speed))
 354                         speeds[count++] = settings[idx].speed;
 355
 356         return count;
 357 }
 358
 359 /**
 360  * phy_check_valid - check if there is a valid PHY setting which matches
 361  *                   speed, duplex, and feature mask
 362  * @speed: speed to match
 363  * @duplex: duplex to match
 364  * @features: A mask of the valid settings
 365  *
 366  * Description: Returns true if there is a valid setting, false otherwise.
 367  */
 368 static inline bool phy_check_valid(int speed, int duplex, u32 features)
 369 {
 370         return !!phy_lookup_setting(speed, duplex, features, true);
 371 }
 372
 373 /**
 374  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 375  * @phydev: the target phy_device struct
 376  *
 377  * Description: Make sure the PHY is set to supported speeds and
 378  *   duplexes.  Drop down by one in this order:  1000/FULL,
 379  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 380  */
 381 static void phy_sanitize_settings(struct phy_device *phydev)
 382 {
 383         const struct phy_setting *setting;
 384         u32 features = phydev->supported;
 385
 386         /* Sanitize settings based on PHY capabilities */
 387         if ((features & SUPPORTED_Autoneg) == 0)
 388                 phydev->autoneg = AUTONEG_DISABLE;
 389
 390         setting = phy_find_valid(phydev->speed, phydev->duplex, features);
 391         if (setting) {
 392                 phydev->speed = setting->speed;
 393                 phydev->duplex = setting->duplex;
 394         } else {
 395                 /* We failed to find anything (no supported speeds?) */
 396                 phydev->speed = SPEED_UNKNOWN;
 397                 phydev->duplex = DUPLEX_UNKNOWN;
 398         }
 399 }
 400
 401 /**
 402  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 403  * @phydev: target phy_device struct
 404  * @cmd: ethtool_cmd
 405  *
 406  * A few notes about parameter checking:
 407  *
 408  * - We don't set port or transceiver, so we don't care what they
 409  *   were set to.
 410  * - phy_start_aneg() will make sure forced settings are sane, and
 411  *   choose the next best ones from the ones selected, so we don't
 412  *   care if ethtool tries to give us bad values.
 413  */
 414 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 415 {
 416         u32 speed = ethtool_cmd_speed(cmd);
 417
 418         if (cmd->phy_address != phydev->mdio.addr)
 419                 return -EINVAL;
 420
 421         /* We make sure that we don't pass unsupported values in to the PHY */
 422         cmd->advertising &= phydev->supported;
 423
 424         /* Verify the settings we care about. */
 425         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 426                 return -EINVAL;
 427
 428         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 429                 return -EINVAL;
 430
 431         if (cmd->autoneg == AUTONEG_DISABLE &&
 432             ((speed != SPEED_1000 &&
 433               speed != SPEED_100 &&
 434               speed != SPEED_10) ||
 435              (cmd->duplex != DUPLEX_HALF &&
 436               cmd->duplex != DUPLEX_FULL)))
 437                 return -EINVAL;
 438
 439         phydev->autoneg = cmd->autoneg;
 440
 441         phydev->speed = speed;
 442
 443         phydev->advertising = cmd->advertising;
 444
 445         if (AUTONEG_ENABLE == cmd->autoneg)
 446                 phydev->advertising |= ADVERTISED_Autoneg;
 447         else
 448                 phydev->advertising &= ~ADVERTISED_Autoneg;
 449
 450         phydev->duplex = cmd->duplex;
 451
 452         phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
 453
 454         /* Restart the PHY */
 455         phy_start_aneg(phydev);
 456
 457         return 0;
 458 }
 459 EXPORT_SYMBOL(phy_ethtool_sset);
 460
 461 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 462                               const struct ethtool_link_ksettings *cmd)
 463 {
 464         u8 autoneg = cmd->base.autoneg;
 465         u8 duplex = cmd->base.duplex;
 466         u32 speed = cmd->base.speed;
 467         u32 advertising;
 468
 469         if (cmd->base.phy_address != phydev->mdio.addr)
 470                 return -EINVAL;
 471
 472         ethtool_convert_link_mode_to_legacy_u32(&advertising,
 473                                                 cmd->link_modes.advertising);
 474
 475         /* We make sure that we don't pass unsupported values in to the PHY */
 476         advertising &= phydev->supported;
 477
 478         /* Verify the settings we care about. */
 479         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 480                 return -EINVAL;
 481
 482         if (autoneg == AUTONEG_ENABLE && advertising == 0)
 483                 return -EINVAL;
 484
 485         if (autoneg == AUTONEG_DISABLE &&
 486             ((speed != SPEED_1000 &&
 487               speed != SPEED_100 &&
 488               speed != SPEED_10) ||
 489              (duplex != DUPLEX_HALF &&
 490               duplex != DUPLEX_FULL)))
 491                 return -EINVAL;
 492
 493         phydev->autoneg = autoneg;
 494
 495         phydev->speed = speed;
 496
 497         phydev->advertising = advertising;
 498
 499         if (autoneg == AUTONEG_ENABLE)
 500                 phydev->advertising |= ADVERTISED_Autoneg;
 501         else
 502                 phydev->advertising &= ~ADVERTISED_Autoneg;
 503
 504         phydev->duplex = duplex;
 505
 506         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 507
 508         /* Restart the PHY */
 509         phy_start_aneg(phydev);
 510
 511         return 0;
 512 }
 513 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 514
 515 void phy_ethtool_ksettings_get(struct phy_device *phydev,
 516                                struct ethtool_link_ksettings *cmd)
 517 {
 518         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 519                                                 phydev->supported);
 520
 521         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 522                                                 phydev->advertising);
 523
 524         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
 525                                                 phydev->lp_advertising);
 526
 527         cmd->base.speed = phydev->speed;
 528         cmd->base.duplex = phydev->duplex;
 529         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 530                 cmd->base.port = PORT_BNC;
 531         else
 532                 cmd->base.port = PORT_MII;
 533
 534         cmd->base.phy_address = phydev->mdio.addr;
 535         cmd->base.autoneg = phydev->autoneg;
 536         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 537         cmd->base.eth_tp_mdix = phydev->mdix;
 538 }
 539 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 540
 541 /**
 542  * phy_mii_ioctl - generic PHY MII ioctl interface
 543  * @phydev: the phy_device struct
 544  * @ifr: &struct ifreq for socket ioctl's
 545  * @cmd: ioctl cmd to execute
 546  *
 547  * Note that this function is currently incompatible with the
 548  * PHYCONTROL layer.  It changes registers without regard to
 549  * current state.  Use at own risk.
 550  */
 551 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 552 {
 553         struct mii_ioctl_data *mii_data = if_mii(ifr);
 554         u16 val = mii_data->val_in;
 555         bool change_autoneg = false;
 556
 557         switch (cmd) {
 558         case SIOCGMIIPHY:
 559                 mii_data->phy_id = phydev->mdio.addr;
 560                 /* fall through */
 561
 562         case SIOCGMIIREG:
 563                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 564                                                  mii_data->phy_id,
 565                                                  mii_data->reg_num);
 566                 return 0;
 567
 568         case SIOCSMIIREG:
 569                 if (mii_data->phy_id == phydev->mdio.addr) {
 570                         switch (mii_data->reg_num) {
 571                         case MII_BMCR:
 572                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 573                                         if (phydev->autoneg == AUTONEG_ENABLE)
 574                                                 change_autoneg = true;
 575                                         phydev->autoneg = AUTONEG_DISABLE;
 576                                         if (val & BMCR_FULLDPLX)
 577                                                 phydev->duplex = DUPLEX_FULL;
 578                                         else
 579                                                 phydev->duplex = DUPLEX_HALF;
 580                                         if (val & BMCR_SPEED1000)
 581                                                 phydev->speed = SPEED_1000;
 582                                         else if (val & BMCR_SPEED100)
 583                                                 phydev->speed = SPEED_100;
 584                                         else phydev->speed = SPEED_10;
 585                                 }
 586                                 else {
 587                                         if (phydev->autoneg == AUTONEG_DISABLE)
 588                                                 change_autoneg = true;
 589                                         phydev->autoneg = AUTONEG_ENABLE;
 590                                 }
 591                                 break;
 592                         case MII_ADVERTISE:
 593                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 594                                 change_autoneg = true;
 595                                 break;
 596                         default:
 597                                 /* do nothing */
 598                                 break;
 599                         }
 600                 }
 601
 602                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 603                               mii_data->reg_num, val);
 604
 605                 if (mii_data->phy_id == phydev->mdio.addr &&
 606                     mii_data->reg_num == MII_BMCR &&
 607                     val & BMCR_RESET)
 608                         return phy_init_hw(phydev);
 609
 610                 if (change_autoneg)
 611                         return phy_start_aneg(phydev);
 612
 613                 return 0;
 614
 615         case SIOCSHWTSTAMP:
 616                 if (phydev->drv && phydev->drv->hwtstamp)
 617                         return phydev->drv->hwtstamp(phydev, ifr);
 618                 /* fall through */
 619
 620         default:
 621                 return -EOPNOTSUPP;
 622         }
 623 }
 624 EXPORT_SYMBOL(phy_mii_ioctl);
 625
 626 /**
 627  * phy_start_aneg_priv - start auto-negotiation for this PHY device
 628  * @phydev: the phy_device struct
 629  * @sync: indicate whether we should wait for the workqueue cancelation
 630  *
 631  * Description: Sanitizes the settings (if we're not autonegotiating
 632  *   them), and then calls the driver's config_aneg function.
 633  *   If the PHYCONTROL Layer is operating, we change the state to
 634  *   reflect the beginning of Auto-negotiation or forcing.
 635  */
 636 static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 637 {
 638         bool trigger = 0;
 639         int err;
 640
 641         if (!phydev->drv)
 642                 return -EIO;
 643
 644         mutex_lock(&phydev->lock);
 645
 646         if (AUTONEG_DISABLE == phydev->autoneg)
 647                 phy_sanitize_settings(phydev);
 648
 649         /* Invalidate LP advertising flags */
 650         phydev->lp_advertising = 0;
 651
 652         err = phydev->drv->config_aneg(phydev);
 653         if (err < 0)
 654                 goto out_unlock;
 655
 656         if (phydev->state != PHY_HALTED) {
 657                 if (AUTONEG_ENABLE == phydev->autoneg) {
 658                         phydev->state = PHY_AN;
 659                         phydev->link_timeout = PHY_AN_TIMEOUT;
 660                 } else {
 661                         phydev->state = PHY_FORCING;
 662                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 663                 }
 664         }
 665
 666         /* Re-schedule a PHY state machine to check PHY status because
 667          * negotiation may already be done and aneg interrupt may not be
 668          * generated.
 669          */
 670         if (phy_interrupt_is_valid(phydev) && (phydev->state == PHY_AN)) {
 671                 err = phy_aneg_done(phydev);
 672                 if (err > 0) {
 673                         trigger = true;
 674                         err = 0;
 675                 }
 676         }
 677
 678 out_unlock:
 679         mutex_unlock(&phydev->lock);
 680
 681         if (trigger)
 682                 phy_trigger_machine(phydev, sync);
 683
 684         return err;
 685 }
 686
 687 /**
 688  * phy_start_aneg - start auto-negotiation for this PHY device
 689  * @phydev: the phy_device struct
 690  *
 691  * Description: Sanitizes the settings (if we're not autonegotiating
 692  *   them), and then calls the driver's config_aneg function.
 693  *   If the PHYCONTROL Layer is operating, we change the state to
 694  *   reflect the beginning of Auto-negotiation or forcing.
 695  */
 696 int phy_start_aneg(struct phy_device *phydev)
 697 {
 698         return phy_start_aneg_priv(phydev, true);
 699 }
 700 EXPORT_SYMBOL(phy_start_aneg);
 701
 702 /**
 703  * phy_start_machine - start PHY state machine tracking
 704  * @phydev: the phy_device struct
 705  *
 706  * Description: The PHY infrastructure can run a state machine
 707  *   which tracks whether the PHY is starting up, negotiating,
 708  *   etc.  This function starts the timer which tracks the state
 709  *   of the PHY.  If you want to maintain your own state machine,
 710  *   do not call this function.
 711  */
 712 void phy_start_machine(struct phy_device *phydev)
 713 {
 714         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 715 }
 716
 717 /**
 718  * phy_trigger_machine - trigger the state machine to run
 719  *
 720  * @phydev: the phy_device struct
 721  * @sync: indicate whether we should wait for the workqueue cancelation
 722  *
 723  * Description: There has been a change in state which requires that the
 724  *   state machine runs.
 725  */
 726
 727 void phy_trigger_machine(struct phy_device *phydev, bool sync)
 728 {
 729         if (sync)
 730                 cancel_delayed_work_sync(&phydev->state_queue);
 731         else
 732                 cancel_delayed_work(&phydev->state_queue);
 733         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 734 }
 735
 736 /**
 737  * phy_stop_machine - stop the PHY state machine tracking
 738  * @phydev: target phy_device struct
 739  *
 740  * Description: Stops the state machine timer, sets the state to UP
 741  *   (unless it wasn't up yet). This function must be called BEFORE
 742  *   phy_detach.
 743  */
 744 void phy_stop_machine(struct phy_device *phydev)
 745 {
 746         cancel_delayed_work_sync(&phydev->state_queue);
 747
 748         mutex_lock(&phydev->lock);
 749         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 750                 phydev->state = PHY_UP;
 751         mutex_unlock(&phydev->lock);
 752
 753         /* Now we can run the state machine synchronously */
 754         phy_state_machine(&phydev->state_queue.work);
 755 }
 756
 757 /**
 758  * phy_error - enter HALTED state for this PHY device
 759  * @phydev: target phy_device struct
 760  *
 761  * Moves the PHY to the HALTED state in response to a read
 762  * or write error, and tells the controller the link is down.
 763  * Must not be called from interrupt context, or while the
 764  * phydev->lock is held.
 765  */
 766 static void phy_error(struct phy_device *phydev)
 767 {
 768         mutex_lock(&phydev->lock);
 769         phydev->state = PHY_HALTED;
 770         mutex_unlock(&phydev->lock);
 771
 772         phy_trigger_machine(phydev, false);
 773 }
 774
 775 /**
 776  * phy_interrupt - PHY interrupt handler
 777  * @irq: interrupt line
 778  * @phy_dat: phy_device pointer
 779  *
 780  * Description: When a PHY interrupt occurs, the handler disables
 781  * interrupts, and uses phy_change to handle the interrupt.
 782  */
 783 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 784 {
 785         struct phy_device *phydev = phy_dat;
 786
 787         if (PHY_HALTED == phydev->state)
 788                 return IRQ_NONE;                /* It can't be ours.  */
 789
 790         disable_irq_nosync(irq);
 791         atomic_inc(&phydev->irq_disable);
 792
 793         phy_change(phydev);
 794
 795         return IRQ_HANDLED;
 796 }
 797
 798 /**
 799  * phy_enable_interrupts - Enable the interrupts from the PHY side
 800  * @phydev: target phy_device struct
 801  */
 802 static int phy_enable_interrupts(struct phy_device *phydev)
 803 {
 804         int err = phy_clear_interrupt(phydev);
 805
 806         if (err < 0)
 807                 return err;
 808
 809         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 810 }
 811
 812 /**
 813  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 814  * @phydev: target phy_device struct
 815  */
 816 static int phy_disable_interrupts(struct phy_device *phydev)
 817 {
 818         int err;
 819
 820         /* Disable PHY interrupts */
 821         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 822         if (err)
 823                 goto phy_err;
 824
 825         /* Clear the interrupt */
 826         err = phy_clear_interrupt(phydev);
 827         if (err)
 828                 goto phy_err;
 829
 830         return 0;
 831
 832 phy_err:
 833         phy_error(phydev);
 834
 835         return err;
 836 }
 837
 838 /**
 839  * phy_start_interrupts - request and enable interrupts for a PHY device
 840  * @phydev: target phy_device struct
 841  *
 842  * Description: Request the interrupt for the given PHY.
 843  *   If this fails, then we set irq to PHY_POLL.
 844  *   Otherwise, we enable the interrupts in the PHY.
 845  *   This should only be called with a valid IRQ number.
 846  *   Returns 0 on success or < 0 on error.
 847  */
 848 int phy_start_interrupts(struct phy_device *phydev)
 849 {
 850         atomic_set(&phydev->irq_disable, 0);
 851         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 852                                  IRQF_ONESHOT | IRQF_SHARED,
 853                                  phydev_name(phydev), phydev) < 0) {
 854                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 855                         phydev->mdio.bus->name, phydev->irq);
 856                 phydev->irq = PHY_POLL;
 857                 return 0;
 858         }
 859
 860         return phy_enable_interrupts(phydev);
 861 }
 862 EXPORT_SYMBOL(phy_start_interrupts);
 863
 864 /**
 865  * phy_stop_interrupts - disable interrupts from a PHY device
 866  * @phydev: target phy_device struct
 867  */
 868 int phy_stop_interrupts(struct phy_device *phydev)
 869 {
 870         int err = phy_disable_interrupts(phydev);
 871
 872         if (err)
 873                 phy_error(phydev);
 874
 875         free_irq(phydev->irq, phydev);
 876
 877         /* If work indeed has been cancelled, disable_irq() will have
 878          * been left unbalanced from phy_interrupt() and enable_irq()
 879          * has to be called so that other devices on the line work.
 880          */
 881         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 882                 enable_irq(phydev->irq);
 883
 884         return err;
 885 }
 886 EXPORT_SYMBOL(phy_stop_interrupts);
 887
 888 /**
 889  * phy_change - Called by the phy_interrupt to handle PHY changes
 890  * @phydev: phy_device struct that interrupted
 891  */
 892 void phy_change(struct phy_device *phydev)
 893 {
 894         if (phy_interrupt_is_valid(phydev)) {
 895                 if (phydev->drv->did_interrupt &&
 896                     !phydev->drv->did_interrupt(phydev))
 897                         goto ignore;
 898
 899                 if (phy_disable_interrupts(phydev))
 900                         goto phy_err;
 901         }
 902
 903         mutex_lock(&phydev->lock);
 904         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 905                 phydev->state = PHY_CHANGELINK;
 906         mutex_unlock(&phydev->lock);
 907
 908         if (phy_interrupt_is_valid(phydev)) {
 909                 atomic_dec(&phydev->irq_disable);
 910                 enable_irq(phydev->irq);
 911
 912                 /* Reenable interrupts */
 913                 if (PHY_HALTED != phydev->state &&
 914                     phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 915                         goto irq_enable_err;
 916         }
 917
 918         /* reschedule state queue work to run as soon as possible */
 919         phy_trigger_machine(phydev, true);
 920         return;
 921
 922 ignore:
 923         atomic_dec(&phydev->irq_disable);
 924         enable_irq(phydev->irq);
 925         return;
 926
 927 irq_enable_err:
 928         disable_irq(phydev->irq);
 929         atomic_inc(&phydev->irq_disable);
 930 phy_err:
 931         phy_error(phydev);
 932 }
 933
 934 /**
 935  * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
 936  * @work: work_struct that describes the work to be done
 937  */
 938 void phy_change_work(struct work_struct *work)
 939 {
 940         struct phy_device *phydev =
 941                 container_of(work, struct phy_device, phy_queue);
 942
 943         phy_change(phydev);
 944 }
 945
 946 /**
 947  * phy_stop - Bring down the PHY link, and stop checking the status
 948  * @phydev: target phy_device struct
 949  */
 950 void phy_stop(struct phy_device *phydev)
 951 {
 952         mutex_lock(&phydev->lock);
 953
 954         if (PHY_HALTED == phydev->state)
 955                 goto out_unlock;
 956
 957         if (phy_interrupt_is_valid(phydev)) {
 958                 /* Disable PHY Interrupts */
 959                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 960
 961                 /* Clear any pending interrupts */
 962                 phy_clear_interrupt(phydev);
 963         }
 964
 965         phydev->state = PHY_HALTED;
 966
 967 out_unlock:
 968         mutex_unlock(&phydev->lock);
 969
 970         /* Cannot call flush_scheduled_work() here as desired because
 971          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 972          * will not reenable interrupts.
 973          */
 974 }
 975 EXPORT_SYMBOL(phy_stop);
 976
 977 /**
 978  * phy_start - start or restart a PHY device
 979  * @phydev: target phy_device struct
 980  *
 981  * Description: Indicates the attached device's readiness to
 982  *   handle PHY-related work.  Used during startup to start the
 983  *   PHY, and after a call to phy_stop() to resume operation.
 984  *   Also used to indicate the MDIO bus has cleared an error
 985  *   condition.
 986  */
 987 void phy_start(struct phy_device *phydev)
 988 {
 989         bool do_resume = false;
 990         int err = 0;
 991
 992         mutex_lock(&phydev->lock);
 993
 994         switch (phydev->state) {
 995         case PHY_STARTING:
 996                 phydev->state = PHY_PENDING;
 997                 break;
 998         case PHY_READY:
 999                 phydev->state = PHY_UP;
1000                 break;
1001         case PHY_HALTED:
1002                 /* make sure interrupts are re-enabled for the PHY */
1003                 if (phydev->irq != PHY_POLL) {
1004                         err = phy_enable_interrupts(phydev);
1005                         if (err < 0)
1006                                 break;
1007                 }
1008
1009                 phydev->state = PHY_RESUMING;
1010                 do_resume = true;
1011                 break;
1012         default:
1013                 break;
1014         }
1015         mutex_unlock(&phydev->lock);
1016
1017         /* if phy was suspended, bring the physical link up again */
1018         if (do_resume)
1019                 phy_resume(phydev);
1020
1021         phy_trigger_machine(phydev, true);
1022 }
1023 EXPORT_SYMBOL(phy_start);
1024
1025 static void phy_adjust_link(struct phy_device *phydev)
1026 {
1027         phydev->adjust_link(phydev->attached_dev);
1028         phy_led_trigger_change_speed(phydev);
1029 }
1030
1031 /**
1032  * phy_state_machine - Handle the state machine
1033  * @work: work_struct that describes the work to be done
1034  */
1035 void phy_state_machine(struct work_struct *work)
1036 {
1037         struct delayed_work *dwork = to_delayed_work(work);
1038         struct phy_device *phydev =
1039                         container_of(dwork, struct phy_device, state_queue);
1040         bool needs_aneg = false, do_suspend = false;
1041         enum phy_state old_state;
1042         int err = 0;
1043         int old_link;
1044
1045         mutex_lock(&phydev->lock);
1046
1047         old_state = phydev->state;
1048
1049         if (phydev->drv && phydev->drv->link_change_notify)
1050                 phydev->drv->link_change_notify(phydev);
1051
1052         switch (phydev->state) {
1053         case PHY_DOWN:
1054         case PHY_STARTING:
1055         case PHY_READY:
1056         case PHY_PENDING:
1057                 break;
1058         case PHY_UP:
1059                 needs_aneg = true;
1060
1061                 phydev->link_timeout = PHY_AN_TIMEOUT;
1062
1063                 break;
1064         case PHY_AN:
1065                 err = phy_read_status(phydev);
1066                 if (err < 0)
1067                         break;
1068
1069                 /* If the link is down, give up on negotiation for now */
1070                 if (!phydev->link) {
1071                         phydev->state = PHY_NOLINK;
1072                         netif_carrier_off(phydev->attached_dev);
1073                         phy_adjust_link(phydev);
1074                         break;
1075                 }
1076
1077                 /* Check if negotiation is done.  Break if there's an error */
1078                 err = phy_aneg_done(phydev);
1079                 if (err < 0)
1080                         break;
1081
1082                 /* If AN is done, we're running */
1083                 if (err > 0) {
1084                         phydev->state = PHY_RUNNING;
1085                         netif_carrier_on(phydev->attached_dev);
1086                         phy_adjust_link(phydev);
1087
1088                 } else if (0 == phydev->link_timeout--)
1089                         needs_aneg = true;
1090                 break;
1091         case PHY_NOLINK:
1092                 if (phy_interrupt_is_valid(phydev))
1093                         break;
1094
1095                 err = phy_read_status(phydev);
1096                 if (err)
1097                         break;
1098
1099                 if (phydev->link) {
1100                         if (AUTONEG_ENABLE == phydev->autoneg) {
1101                                 err = phy_aneg_done(phydev);
1102                                 if (err < 0)
1103                                         break;
1104
1105                                 if (!err) {
1106                                         phydev->state = PHY_AN;
1107                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1108                                         break;
1109                                 }
1110                         }
1111                         phydev->state = PHY_RUNNING;
1112                         netif_carrier_on(phydev->attached_dev);
1113                         phy_adjust_link(phydev);
1114                 }
1115                 break;
1116         case PHY_FORCING:
1117                 err = genphy_update_link(phydev);
1118                 if (err)
1119                         break;
1120
1121                 if (phydev->link) {
1122                         phydev->state = PHY_RUNNING;
1123                         netif_carrier_on(phydev->attached_dev);
1124                 } else {
1125                         if (0 == phydev->link_timeout--)
1126                                 needs_aneg = true;
1127                 }
1128
1129                 phy_adjust_link(phydev);
1130                 break;
1131         case PHY_RUNNING:
1132                 /* Only register a CHANGE if we are polling and link changed
1133                  * since latest checking.
1134                  */
1135                 if (phydev->irq == PHY_POLL) {
1136                         old_link = phydev->link;
1137                         err = phy_read_status(phydev);
1138                         if (err)
1139                                 break;
1140
1141                         if (old_link != phydev->link)
1142                                 phydev->state = PHY_CHANGELINK;
1143                 }
1144                 /*
1145                  * Failsafe: check that nobody set phydev->link=0 between two
1146                  * poll cycles, otherwise we won't leave RUNNING state as long
1147                  * as link remains down.
1148                  */
1149                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1150                         phydev->state = PHY_CHANGELINK;
1151                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1152                 }
1153                 break;
1154         case PHY_CHANGELINK:
1155                 err = phy_read_status(phydev);
1156                 if (err)
1157                         break;
1158
1159                 if (phydev->link) {
1160                         phydev->state = PHY_RUNNING;
1161                         netif_carrier_on(phydev->attached_dev);
1162                 } else {
1163                         phydev->state = PHY_NOLINK;
1164                         netif_carrier_off(phydev->attached_dev);
1165                 }
1166
1167                 phy_adjust_link(phydev);
1168
1169                 if (phy_interrupt_is_valid(phydev))
1170                         err = phy_config_interrupt(phydev,
1171                                                    PHY_INTERRUPT_ENABLED);
1172                 break;
1173         case PHY_HALTED:
1174                 if (phydev->link) {
1175                         phydev->link = 0;
1176                         netif_carrier_off(phydev->attached_dev);
1177                         phy_adjust_link(phydev);
1178                         do_suspend = true;
1179                 }
1180                 break;
1181         case PHY_RESUMING:
1182                 if (AUTONEG_ENABLE == phydev->autoneg) {
1183                         err = phy_aneg_done(phydev);
1184                         if (err < 0)
1185                                 break;
1186
1187                         /* err > 0 if AN is done.
1188                          * Otherwise, it's 0, and we're  still waiting for AN
1189                          */
1190                         if (err > 0) {
1191                                 err = phy_read_status(phydev);
1192                                 if (err)
1193                                         break;
1194
1195                                 if (phydev->link) {
1196                                         phydev->state = PHY_RUNNING;
1197                                         netif_carrier_on(phydev->attached_dev);
1198                                 } else  {
1199                                         phydev->state = PHY_NOLINK;
1200                                 }
1201                                 phy_adjust_link(phydev);
1202                         } else {
1203                                 phydev->state = PHY_AN;
1204                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1205                         }
1206                 } else {
1207                         err = phy_read_status(phydev);
1208                         if (err)
1209                                 break;
1210
1211                         if (phydev->link) {
1212                                 phydev->state = PHY_RUNNING;
1213                                 netif_carrier_on(phydev->attached_dev);
1214                         } else  {
1215                                 phydev->state = PHY_NOLINK;
1216                         }
1217                         phy_adjust_link(phydev);
1218                 }
1219                 break;
1220         }
1221
1222         mutex_unlock(&phydev->lock);
1223
1224         if (needs_aneg)
1225                 err = phy_start_aneg_priv(phydev, false);
1226         else if (do_suspend)
1227                 phy_suspend(phydev);
1228
1229         if (err < 0)
1230                 phy_error(phydev);
1231
1232         phydev_dbg(phydev, "PHY state change %s -> %s\n",
1233                    phy_state_to_str(old_state),
1234                    phy_state_to_str(phydev->state));
1235
1236         /* Only re-schedule a PHY state machine change if we are polling the
1237          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1238          * between states from phy_mac_interrupt()
1239          */
1240         if (phydev->irq == PHY_POLL)
1241                 queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1242                                    PHY_STATE_TIME * HZ);
1243 }
1244
1245 /**
1246  * phy_mac_interrupt - MAC says the link has changed
1247  * @phydev: phy_device struct with changed link
1248  * @new_link: Link is Up/Down.
1249  *
1250  * Description: The MAC layer is able indicate there has been a change
1251  *   in the PHY link status. Set the new link status, and trigger the
1252  *   state machine, work a work queue.
1253  */
1254 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
1255 {
1256         phydev->link = new_link;
1257
1258         /* Trigger a state machine change */
1259         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1260 }
1261 EXPORT_SYMBOL(phy_mac_interrupt);
1262
1263 /**
1264  * phy_init_eee - init and check the EEE feature
1265  * @phydev: target phy_device struct
1266  * @clk_stop_enable: PHY may stop the clock during LPI
1267  *
1268  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1269  * is supported by looking at the MMD registers 3.20 and 7.60/61
1270  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1271  * bit if required.
1272  */
1273 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1274 {
1275         if (!phydev->drv)
1276                 return -EIO;
1277
1278         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1279          */
1280         if (phydev->duplex == DUPLEX_FULL) {
1281                 int eee_lp, eee_cap, eee_adv;
1282                 u32 lp, cap, adv;
1283                 int status;
1284
1285                 /* Read phy status to properly get the right settings */
1286                 status = phy_read_status(phydev);
1287                 if (status)
1288                         return status;
1289
1290                 /* First check if the EEE ability is supported */
1291                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1292                 if (eee_cap <= 0)
1293                         goto eee_exit_err;
1294
1295                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1296                 if (!cap)
1297                         goto eee_exit_err;
1298
1299                 /* Check which link settings negotiated and verify it in
1300                  * the EEE advertising registers.
1301                  */
1302                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1303                 if (eee_lp <= 0)
1304                         goto eee_exit_err;
1305
1306                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1307                 if (eee_adv <= 0)
1308                         goto eee_exit_err;
1309
1310                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1311                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1312                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1313                         goto eee_exit_err;
1314
1315                 if (clk_stop_enable) {
1316                         /* Configure the PHY to stop receiving xMII
1317                          * clock while it is signaling LPI.
1318                          */
1319                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1320                         if (val < 0)
1321                                 return val;
1322
1323                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1324                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1325                 }
1326
1327                 return 0; /* EEE supported */
1328         }
1329 eee_exit_err:
1330         return -EPROTONOSUPPORT;
1331 }
1332 EXPORT_SYMBOL(phy_init_eee);
1333
1334 /**
1335  * phy_get_eee_err - report the EEE wake error count
1336  * @phydev: target phy_device struct
1337  *
1338  * Description: it is to report the number of time where the PHY
1339  * failed to complete its normal wake sequence.
1340  */
1341 int phy_get_eee_err(struct phy_device *phydev)
1342 {
1343         if (!phydev->drv)
1344                 return -EIO;
1345
1346         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1347 }
1348 EXPORT_SYMBOL(phy_get_eee_err);
1349
1350 /**
1351  * phy_ethtool_get_eee - get EEE supported and status
1352  * @phydev: target phy_device struct
1353  * @data: ethtool_eee data
1354  *
1355  * Description: it reportes the Supported/Advertisement/LP Advertisement
1356  * capabilities.
1357  */
1358 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1359 {
1360         int val;
1361
1362         if (!phydev->drv)
1363                 return -EIO;
1364
1365         /* Get Supported EEE */
1366         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1367         if (val < 0)
1368                 return val;
1369         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1370
1371         /* Get advertisement EEE */
1372         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1373         if (val < 0)
1374                 return val;
1375         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1376
1377         /* Get LP advertisement EEE */
1378         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1379         if (val < 0)
1380                 return val;
1381         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1382
1383         return 0;
1384 }
1385 EXPORT_SYMBOL(phy_ethtool_get_eee);
1386
1387 /**
1388  * phy_ethtool_set_eee - set EEE supported and status
1389  * @phydev: target phy_device struct
1390  * @data: ethtool_eee data
1391  *
1392  * Description: it is to program the Advertisement EEE register.
1393  */
1394 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1395 {
1396         int cap, old_adv, adv, ret;
1397
1398         if (!phydev->drv)
1399                 return -EIO;
1400
1401         /* Get Supported EEE */
1402         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1403         if (cap < 0)
1404                 return cap;
1405
1406         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1407         if (old_adv < 0)
1408                 return old_adv;
1409
1410         adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1411
1412         /* Mask prohibited EEE modes */
1413         adv &= ~phydev->eee_broken_modes;
1414
1415         if (old_adv != adv) {
1416                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1417                 if (ret < 0)
1418                         return ret;
1419
1420                 /* Restart autonegotiation so the new modes get sent to the
1421                  * link partner.
1422                  */
1423                 ret = phy_restart_aneg(phydev);
1424                 if (ret < 0)
1425                         return ret;
1426         }
1427
1428         return 0;
1429 }
1430 EXPORT_SYMBOL(phy_ethtool_set_eee);
1431
1432 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1433 {
1434         if (phydev->drv && phydev->drv->set_wol)
1435                 return phydev->drv->set_wol(phydev, wol);
1436
1437         return -EOPNOTSUPP;
1438 }
1439 EXPORT_SYMBOL(phy_ethtool_set_wol);
1440
1441 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1442 {
1443         if (phydev->drv && phydev->drv->get_wol)
1444                 phydev->drv->get_wol(phydev, wol);
1445 }
1446 EXPORT_SYMBOL(phy_ethtool_get_wol);
1447
1448 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1449                                    struct ethtool_link_ksettings *cmd)
1450 {
1451         struct phy_device *phydev = ndev->phydev;
1452
1453         if (!phydev)
1454                 return -ENODEV;
1455
1456         phy_ethtool_ksettings_get(phydev, cmd);
1457
1458         return 0;
1459 }
1460 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1461
1462 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1463                                    const struct ethtool_link_ksettings *cmd)
1464 {
1465         struct phy_device *phydev = ndev->phydev;
1466
1467         if (!phydev)
1468                 return -ENODEV;
1469
1470         return phy_ethtool_ksettings_set(phydev, cmd);
1471 }
1472 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1473
1474 int phy_ethtool_nway_reset(struct net_device *ndev)
1475 {
1476         struct phy_device *phydev = ndev->phydev;
1477
1478         if (!phydev)
1479                 return -ENODEV;
1480
1481         if (!phydev->drv)
1482                 return -EIO;
1483
1484         return phy_restart_aneg(phydev);
1485 }
1486 EXPORT_SYMBOL(phy_ethtool_nway_reset);