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/timer.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/mdio.h>
  35 #include <linux/io.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/atomic.h>
  38
  39 #include <asm/irq.h>
  40
  41 static const char *phy_speed_to_str(int speed)
  42 {
  43         switch (speed) {
  44         case SPEED_10:
  45                 return "10Mbps";
  46         case SPEED_100:
  47                 return "100Mbps";
  48         case SPEED_1000:
  49                 return "1Gbps";
  50         case SPEED_2500:
  51                 return "2.5Gbps";
  52         case SPEED_10000:
  53                 return "10Gbps";
  54         case SPEED_UNKNOWN:
  55                 return "Unknown";
  56         default:
  57                 return "Unsupported (update phy.c)";
  58         }
  59 }
  60
  61 #define PHY_STATE_STR(_state)                   \
  62         case PHY_##_state:                      \
  63                 return __stringify(_state);     \
  64
  65 static const char *phy_state_to_str(enum phy_state st)
  66 {
  67         switch (st) {
  68         PHY_STATE_STR(DOWN)
  69         PHY_STATE_STR(STARTING)
  70         PHY_STATE_STR(READY)
  71         PHY_STATE_STR(PENDING)
  72         PHY_STATE_STR(UP)
  73         PHY_STATE_STR(AN)
  74         PHY_STATE_STR(RUNNING)
  75         PHY_STATE_STR(NOLINK)
  76         PHY_STATE_STR(FORCING)
  77         PHY_STATE_STR(CHANGELINK)
  78         PHY_STATE_STR(HALTED)
  79         PHY_STATE_STR(RESUMING)
  80         }
  81
  82         return NULL;
  83 }
  84
  85
  86 /**
  87  * phy_print_status - Convenience function to print out the current phy status
  88  * @phydev: the phy_device struct
  89  */
  90 void phy_print_status(struct phy_device *phydev)
  91 {
  92         if (phydev->link) {
  93                 netdev_info(phydev->attached_dev,
  94                         "Link is Up - %s/%s - flow control %s\n",
  95                         phy_speed_to_str(phydev->speed),
  96                         DUPLEX_FULL == phydev->duplex ? "Full" : "Half",
  97                         phydev->pause ? "rx/tx" : "off");
  98         } else  {
  99                 netdev_info(phydev->attached_dev, "Link is Down\n");
 100         }
 101 }
 102 EXPORT_SYMBOL(phy_print_status);
 103
 104 /**
 105  * phy_clear_interrupt - Ack the phy device's interrupt
 106  * @phydev: the phy_device struct
 107  *
 108  * If the @phydev driver has an ack_interrupt function, call it to
 109  * ack and clear the phy device's interrupt.
 110  *
 111  * Returns 0 on success or < 0 on error.
 112  */
 113 static int phy_clear_interrupt(struct phy_device *phydev)
 114 {
 115         if (phydev->drv->ack_interrupt)
 116                 return phydev->drv->ack_interrupt(phydev);
 117
 118         return 0;
 119 }
 120
 121 /**
 122  * phy_config_interrupt - configure the PHY device for the requested interrupts
 123  * @phydev: the phy_device struct
 124  * @interrupts: interrupt flags to configure for this @phydev
 125  *
 126  * Returns 0 on success or < 0 on error.
 127  */
 128 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 129 {
 130         phydev->interrupts = interrupts;
 131         if (phydev->drv->config_intr)
 132                 return phydev->drv->config_intr(phydev);
 133
 134         return 0;
 135 }
 136
 137
 138 /**
 139  * phy_aneg_done - return auto-negotiation status
 140  * @phydev: target phy_device struct
 141  *
 142  * Description: Return the auto-negotiation status from this @phydev
 143  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 144  * is still pending.
 145  */
 146 static inline int phy_aneg_done(struct phy_device *phydev)
 147 {
 148         if (phydev->drv->aneg_done)
 149                 return phydev->drv->aneg_done(phydev);
 150
 151         /* Avoid genphy_aneg_done() if the Clause 45 PHY does not
 152          * implement Clause 22 registers
 153          */
 154         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 155                 return -EINVAL;
 156
 157         return genphy_aneg_done(phydev);
 158 }
 159
 160 /* A structure for mapping a particular speed and duplex
 161  * combination to a particular SUPPORTED and ADVERTISED value
 162  */
 163 struct phy_setting {
 164         int speed;
 165         int duplex;
 166         u32 setting;
 167 };
 168
 169 /* A mapping of all SUPPORTED settings to speed/duplex */
 170 static const struct phy_setting settings[] = {
 171         {
 172                 .speed = SPEED_10000,
 173                 .duplex = DUPLEX_FULL,
 174                 .setting = SUPPORTED_10000baseKR_Full,
 175         },
 176         {
 177                 .speed = SPEED_10000,
 178                 .duplex = DUPLEX_FULL,
 179                 .setting = SUPPORTED_10000baseKX4_Full,
 180         },
 181         {
 182                 .speed = SPEED_10000,
 183                 .duplex = DUPLEX_FULL,
 184                 .setting = SUPPORTED_10000baseT_Full,
 185         },
 186         {
 187                 .speed = SPEED_2500,
 188                 .duplex = DUPLEX_FULL,
 189                 .setting = SUPPORTED_2500baseX_Full,
 190         },
 191         {
 192                 .speed = SPEED_1000,
 193                 .duplex = DUPLEX_FULL,
 194                 .setting = SUPPORTED_1000baseKX_Full,
 195         },
 196         {
 197                 .speed = SPEED_1000,
 198                 .duplex = DUPLEX_FULL,
 199                 .setting = SUPPORTED_1000baseT_Full,
 200         },
 201         {
 202                 .speed = SPEED_1000,
 203                 .duplex = DUPLEX_HALF,
 204                 .setting = SUPPORTED_1000baseT_Half,
 205         },
 206         {
 207                 .speed = SPEED_100,
 208                 .duplex = DUPLEX_FULL,
 209                 .setting = SUPPORTED_100baseT_Full,
 210         },
 211         {
 212                 .speed = SPEED_100,
 213                 .duplex = DUPLEX_HALF,
 214                 .setting = SUPPORTED_100baseT_Half,
 215         },
 216         {
 217                 .speed = SPEED_10,
 218                 .duplex = DUPLEX_FULL,
 219                 .setting = SUPPORTED_10baseT_Full,
 220         },
 221         {
 222                 .speed = SPEED_10,
 223                 .duplex = DUPLEX_HALF,
 224                 .setting = SUPPORTED_10baseT_Half,
 225         },
 226 };
 227
 228 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 229
 230 /**
 231  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 232  * @speed: speed to match
 233  * @duplex: duplex to match
 234  *
 235  * Description: Searches the settings array for the setting which
 236  *   matches the desired speed and duplex, and returns the index
 237  *   of that setting.  Returns the index of the last setting if
 238  *   none of the others match.
 239  */
 240 static inline unsigned int phy_find_setting(int speed, int duplex)
 241 {
 242         unsigned int idx = 0;
 243
 244         while (idx < ARRAY_SIZE(settings) &&
 245                (settings[idx].speed != speed || settings[idx].duplex != duplex))
 246                 idx++;
 247
 248         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 249 }
 250
 251 /**
 252  * phy_find_valid - find a PHY setting that matches the requested features mask
 253  * @idx: The first index in settings[] to search
 254  * @features: A mask of the valid settings
 255  *
 256  * Description: Returns the index of the first valid setting less
 257  *   than or equal to the one pointed to by idx, as determined by
 258  *   the mask in features.  Returns the index of the last setting
 259  *   if nothing else matches.
 260  */
 261 static inline unsigned int phy_find_valid(unsigned int idx, u32 features)
 262 {
 263         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 264                 idx++;
 265
 266         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 267 }
 268
 269 /**
 270  * phy_check_valid - check if there is a valid PHY setting which matches
 271  *                   speed, duplex, and feature mask
 272  * @speed: speed to match
 273  * @duplex: duplex to match
 274  * @features: A mask of the valid settings
 275  *
 276  * Description: Returns true if there is a valid setting, false otherwise.
 277  */
 278 static inline bool phy_check_valid(int speed, int duplex, u32 features)
 279 {
 280         unsigned int idx;
 281
 282         idx = phy_find_valid(phy_find_setting(speed, duplex), features);
 283
 284         return settings[idx].speed == speed && settings[idx].duplex == duplex &&
 285                 (settings[idx].setting & features);
 286 }
 287
 288 /**
 289  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 290  * @phydev: the target phy_device struct
 291  *
 292  * Description: Make sure the PHY is set to supported speeds and
 293  *   duplexes.  Drop down by one in this order:  1000/FULL,
 294  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 295  */
 296 static void phy_sanitize_settings(struct phy_device *phydev)
 297 {
 298         u32 features = phydev->supported;
 299         unsigned int idx;
 300
 301         /* Sanitize settings based on PHY capabilities */
 302         if ((features & SUPPORTED_Autoneg) == 0)
 303                 phydev->autoneg = AUTONEG_DISABLE;
 304
 305         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 306                         features);
 307
 308         phydev->speed = settings[idx].speed;
 309         phydev->duplex = settings[idx].duplex;
 310 }
 311
 312 /**
 313  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 314  * @phydev: target phy_device struct
 315  * @cmd: ethtool_cmd
 316  *
 317  * A few notes about parameter checking:
 318  * - We don't set port or transceiver, so we don't care what they
 319  *   were set to.
 320  * - phy_start_aneg() will make sure forced settings are sane, and
 321  *   choose the next best ones from the ones selected, so we don't
 322  *   care if ethtool tries to give us bad values.
 323  */
 324 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 325 {
 326         u32 speed = ethtool_cmd_speed(cmd);
 327
 328         if (cmd->phy_address != phydev->mdio.addr)
 329                 return -EINVAL;
 330
 331         /* We make sure that we don't pass unsupported values in to the PHY */
 332         cmd->advertising &= phydev->supported;
 333
 334         /* Verify the settings we care about. */
 335         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 336                 return -EINVAL;
 337
 338         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 339                 return -EINVAL;
 340
 341         if (cmd->autoneg == AUTONEG_DISABLE &&
 342             ((speed != SPEED_1000 &&
 343               speed != SPEED_100 &&
 344               speed != SPEED_10) ||
 345              (cmd->duplex != DUPLEX_HALF &&
 346               cmd->duplex != DUPLEX_FULL)))
 347                 return -EINVAL;
 348
 349         phydev->autoneg = cmd->autoneg;
 350
 351         phydev->speed = speed;
 352
 353         phydev->advertising = cmd->advertising;
 354
 355         if (AUTONEG_ENABLE == cmd->autoneg)
 356                 phydev->advertising |= ADVERTISED_Autoneg;
 357         else
 358                 phydev->advertising &= ~ADVERTISED_Autoneg;
 359
 360         phydev->duplex = cmd->duplex;
 361
 362         phydev->mdix = cmd->eth_tp_mdix_ctrl;
 363
 364         /* Restart the PHY */
 365         phy_start_aneg(phydev);
 366
 367         return 0;
 368 }
 369 EXPORT_SYMBOL(phy_ethtool_sset);
 370
 371 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 372                               const struct ethtool_link_ksettings *cmd)
 373 {
 374         u8 autoneg = cmd->base.autoneg;
 375         u8 duplex = cmd->base.duplex;
 376         u32 speed = cmd->base.speed;
 377         u32 advertising;
 378
 379         if (cmd->base.phy_address != phydev->mdio.addr)
 380                 return -EINVAL;
 381
 382         ethtool_convert_link_mode_to_legacy_u32(&advertising,
 383                                                 cmd->link_modes.advertising);
 384
 385         /* We make sure that we don't pass unsupported values in to the PHY */
 386         advertising &= phydev->supported;
 387
 388         /* Verify the settings we care about. */
 389         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 390                 return -EINVAL;
 391
 392         if (autoneg == AUTONEG_ENABLE && advertising == 0)
 393                 return -EINVAL;
 394
 395         if (autoneg == AUTONEG_DISABLE &&
 396             ((speed != SPEED_1000 &&
 397               speed != SPEED_100 &&
 398               speed != SPEED_10) ||
 399              (duplex != DUPLEX_HALF &&
 400               duplex != DUPLEX_FULL)))
 401                 return -EINVAL;
 402
 403         phydev->autoneg = autoneg;
 404
 405         phydev->speed = speed;
 406
 407         phydev->advertising = advertising;
 408
 409         if (autoneg == AUTONEG_ENABLE)
 410                 phydev->advertising |= ADVERTISED_Autoneg;
 411         else
 412                 phydev->advertising &= ~ADVERTISED_Autoneg;
 413
 414         phydev->duplex = duplex;
 415
 416         phydev->mdix = cmd->base.eth_tp_mdix_ctrl;
 417
 418         /* Restart the PHY */
 419         phy_start_aneg(phydev);
 420
 421         return 0;
 422 }
 423 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 424
 425 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 426 {
 427         cmd->supported = phydev->supported;
 428
 429         cmd->advertising = phydev->advertising;
 430         cmd->lp_advertising = phydev->lp_advertising;
 431
 432         ethtool_cmd_speed_set(cmd, phydev->speed);
 433         cmd->duplex = phydev->duplex;
 434         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 435                 cmd->port = PORT_BNC;
 436         else
 437                 cmd->port = PORT_MII;
 438         cmd->phy_address = phydev->mdio.addr;
 439         cmd->transceiver = phy_is_internal(phydev) ?
 440                 XCVR_INTERNAL : XCVR_EXTERNAL;
 441         cmd->autoneg = phydev->autoneg;
 442         cmd->eth_tp_mdix_ctrl = phydev->mdix;
 443
 444         return 0;
 445 }
 446 EXPORT_SYMBOL(phy_ethtool_gset);
 447
 448 int phy_ethtool_ksettings_get(struct phy_device *phydev,
 449                               struct ethtool_link_ksettings *cmd)
 450 {
 451         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 452                                                 phydev->supported);
 453
 454         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 455                                                 phydev->advertising);
 456
 457         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
 458                                                 phydev->lp_advertising);
 459
 460         cmd->base.speed = phydev->speed;
 461         cmd->base.duplex = phydev->duplex;
 462         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 463                 cmd->base.port = PORT_BNC;
 464         else
 465                 cmd->base.port = PORT_MII;
 466         cmd->base.transceiver = phy_is_internal(phydev) ?
 467                                 XCVR_INTERNAL : XCVR_EXTERNAL;
 468         cmd->base.phy_address = phydev->mdio.addr;
 469         cmd->base.autoneg = phydev->autoneg;
 470         cmd->base.eth_tp_mdix_ctrl = phydev->mdix;
 471
 472         return 0;
 473 }
 474 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 475
 476 /**
 477  * phy_mii_ioctl - generic PHY MII ioctl interface
 478  * @phydev: the phy_device struct
 479  * @ifr: &struct ifreq for socket ioctl's
 480  * @cmd: ioctl cmd to execute
 481  *
 482  * Note that this function is currently incompatible with the
 483  * PHYCONTROL layer.  It changes registers without regard to
 484  * current state.  Use at own risk.
 485  */
 486 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 487 {
 488         struct mii_ioctl_data *mii_data = if_mii(ifr);
 489         u16 val = mii_data->val_in;
 490         bool change_autoneg = false;
 491
 492         switch (cmd) {
 493         case SIOCGMIIPHY:
 494                 mii_data->phy_id = phydev->mdio.addr;
 495                 /* fall through */
 496
 497         case SIOCGMIIREG:
 498                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 499                                                  mii_data->phy_id,
 500                                                  mii_data->reg_num);
 501                 return 0;
 502
 503         case SIOCSMIIREG:
 504                 if (mii_data->phy_id == phydev->mdio.addr) {
 505                         switch (mii_data->reg_num) {
 506                         case MII_BMCR:
 507                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 508                                         if (phydev->autoneg == AUTONEG_ENABLE)
 509                                                 change_autoneg = true;
 510                                         phydev->autoneg = AUTONEG_DISABLE;
 511                                         if (val & BMCR_FULLDPLX)
 512                                                 phydev->duplex = DUPLEX_FULL;
 513                                         else
 514                                                 phydev->duplex = DUPLEX_HALF;
 515                                         if (val & BMCR_SPEED1000)
 516                                                 phydev->speed = SPEED_1000;
 517                                         else if (val & BMCR_SPEED100)
 518                                                 phydev->speed = SPEED_100;
 519                                         else phydev->speed = SPEED_10;
 520                                 }
 521                                 else {
 522                                         if (phydev->autoneg == AUTONEG_DISABLE)
 523                                                 change_autoneg = true;
 524                                         phydev->autoneg = AUTONEG_ENABLE;
 525                                 }
 526                                 break;
 527                         case MII_ADVERTISE:
 528                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 529                                 change_autoneg = true;
 530                                 break;
 531                         default:
 532                                 /* do nothing */
 533                                 break;
 534                         }
 535                 }
 536
 537                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 538                               mii_data->reg_num, val);
 539
 540                 if (mii_data->phy_id == phydev->mdio.addr &&
 541                     mii_data->reg_num == MII_BMCR &&
 542                     val & BMCR_RESET)
 543                         return phy_init_hw(phydev);
 544
 545                 if (change_autoneg)
 546                         return phy_start_aneg(phydev);
 547
 548                 return 0;
 549
 550         case SIOCSHWTSTAMP:
 551                 if (phydev->drv->hwtstamp)
 552                         return phydev->drv->hwtstamp(phydev, ifr);
 553                 /* fall through */
 554
 555         default:
 556                 return -EOPNOTSUPP;
 557         }
 558 }
 559 EXPORT_SYMBOL(phy_mii_ioctl);
 560
 561 /**
 562  * phy_start_aneg_priv - start auto-negotiation for this PHY device
 563  * @phydev: the phy_device struct
 564  * @sync: indicate whether we should wait for the workqueue cancelation
 565  *
 566  * Description: Sanitizes the settings (if we're not autonegotiating
 567  *   them), and then calls the driver's config_aneg function.
 568  *   If the PHYCONTROL Layer is operating, we change the state to
 569  *   reflect the beginning of Auto-negotiation or forcing.
 570  */
 571 static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 572 {
 573         bool trigger = 0;
 574         int err;
 575
 576         mutex_lock(&phydev->lock);
 577
 578         if (AUTONEG_DISABLE == phydev->autoneg)
 579                 phy_sanitize_settings(phydev);
 580
 581         /* Invalidate LP advertising flags */
 582         phydev->lp_advertising = 0;
 583
 584         err = phydev->drv->config_aneg(phydev);
 585         if (err < 0)
 586                 goto out_unlock;
 587
 588         if (phydev->state != PHY_HALTED) {
 589                 if (AUTONEG_ENABLE == phydev->autoneg) {
 590                         phydev->state = PHY_AN;
 591                         phydev->link_timeout = PHY_AN_TIMEOUT;
 592                 } else {
 593                         phydev->state = PHY_FORCING;
 594                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 595                 }
 596         }
 597
 598         /* Re-schedule a PHY state machine to check PHY status because
 599          * negotiation may already be done and aneg interrupt may not be
 600          * generated.
 601          */
 602         if (phydev->irq != PHY_POLL && phydev->state == PHY_AN) {
 603                 err = phy_aneg_done(phydev);
 604                 if (err > 0) {
 605                         trigger = true;
 606                         err = 0;
 607                 }
 608         }
 609
 610 out_unlock:
 611         mutex_unlock(&phydev->lock);
 612
 613         if (trigger)
 614                 phy_trigger_machine(phydev, sync);
 615
 616         return err;
 617 }
 618
 619 /**
 620  * phy_start_aneg - start auto-negotiation for this PHY device
 621  * @phydev: the phy_device struct
 622  *
 623  * Description: Sanitizes the settings (if we're not autonegotiating
 624  *   them), and then calls the driver's config_aneg function.
 625  *   If the PHYCONTROL Layer is operating, we change the state to
 626  *   reflect the beginning of Auto-negotiation or forcing.
 627  */
 628 int phy_start_aneg(struct phy_device *phydev)
 629 {
 630         return phy_start_aneg_priv(phydev, true);
 631 }
 632 EXPORT_SYMBOL(phy_start_aneg);
 633
 634 /**
 635  * phy_start_machine - start PHY state machine tracking
 636  * @phydev: the phy_device struct
 637  *
 638  * Description: The PHY infrastructure can run a state machine
 639  *   which tracks whether the PHY is starting up, negotiating,
 640  *   etc.  This function starts the timer which tracks the state
 641  *   of the PHY.  If you want to maintain your own state machine,
 642  *   do not call this function.
 643  */
 644 void phy_start_machine(struct phy_device *phydev)
 645 {
 646         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 647 }
 648
 649 /**
 650  * phy_trigger_machine - trigger the state machine to run
 651  *
 652  * @phydev: the phy_device struct
 653  * @sync: indicate whether we should wait for the workqueue cancelation
 654  *
 655  * Description: There has been a change in state which requires that the
 656  *   state machine runs.
 657  */
 658
 659 void phy_trigger_machine(struct phy_device *phydev, bool sync)
 660 {
 661         if (sync)
 662                 cancel_delayed_work_sync(&phydev->state_queue);
 663         else
 664                 cancel_delayed_work(&phydev->state_queue);
 665         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 666 }
 667
 668 /**
 669  * phy_stop_machine - stop the PHY state machine tracking
 670  * @phydev: target phy_device struct
 671  *
 672  * Description: Stops the state machine timer, sets the state to UP
 673  *   (unless it wasn't up yet). This function must be called BEFORE
 674  *   phy_detach.
 675  */
 676 void phy_stop_machine(struct phy_device *phydev)
 677 {
 678         cancel_delayed_work_sync(&phydev->state_queue);
 679
 680         mutex_lock(&phydev->lock);
 681         if (phydev->state > PHY_UP && phydev->state != PHY_HALTED)
 682                 phydev->state = PHY_UP;
 683         mutex_unlock(&phydev->lock);
 684 }
 685
 686 /**
 687  * phy_error - enter HALTED state for this PHY device
 688  * @phydev: target phy_device struct
 689  *
 690  * Moves the PHY to the HALTED state in response to a read
 691  * or write error, and tells the controller the link is down.
 692  * Must not be called from interrupt context, or while the
 693  * phydev->lock is held.
 694  */
 695 static void phy_error(struct phy_device *phydev)
 696 {
 697         mutex_lock(&phydev->lock);
 698         phydev->state = PHY_HALTED;
 699         mutex_unlock(&phydev->lock);
 700
 701         phy_trigger_machine(phydev, false);
 702 }
 703
 704 /**
 705  * phy_interrupt - PHY interrupt handler
 706  * @irq: interrupt line
 707  * @phy_dat: phy_device pointer
 708  *
 709  * Description: When a PHY interrupt occurs, the handler disables
 710  * interrupts, and schedules a work task to clear the interrupt.
 711  */
 712 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 713 {
 714         struct phy_device *phydev = phy_dat;
 715
 716         if (PHY_HALTED == phydev->state)
 717                 return IRQ_NONE;                /* It can't be ours.  */
 718
 719         /* The MDIO bus is not allowed to be written in interrupt
 720          * context, so we need to disable the irq here.  A work
 721          * queue will write the PHY to disable and clear the
 722          * interrupt, and then reenable the irq line.
 723          */
 724         disable_irq_nosync(irq);
 725         atomic_inc(&phydev->irq_disable);
 726
 727         queue_work(system_power_efficient_wq, &phydev->phy_queue);
 728
 729         return IRQ_HANDLED;
 730 }
 731
 732 /**
 733  * phy_enable_interrupts - Enable the interrupts from the PHY side
 734  * @phydev: target phy_device struct
 735  */
 736 static int phy_enable_interrupts(struct phy_device *phydev)
 737 {
 738         int err = phy_clear_interrupt(phydev);
 739
 740         if (err < 0)
 741                 return err;
 742
 743         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 744 }
 745
 746 /**
 747  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 748  * @phydev: target phy_device struct
 749  */
 750 static int phy_disable_interrupts(struct phy_device *phydev)
 751 {
 752         int err;
 753
 754         /* Disable PHY interrupts */
 755         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 756         if (err)
 757                 goto phy_err;
 758
 759         /* Clear the interrupt */
 760         err = phy_clear_interrupt(phydev);
 761         if (err)
 762                 goto phy_err;
 763
 764         return 0;
 765
 766 phy_err:
 767         phy_error(phydev);
 768
 769         return err;
 770 }
 771
 772 /**
 773  * phy_start_interrupts - request and enable interrupts for a PHY device
 774  * @phydev: target phy_device struct
 775  *
 776  * Description: Request the interrupt for the given PHY.
 777  *   If this fails, then we set irq to PHY_POLL.
 778  *   Otherwise, we enable the interrupts in the PHY.
 779  *   This should only be called with a valid IRQ number.
 780  *   Returns 0 on success or < 0 on error.
 781  */
 782 int phy_start_interrupts(struct phy_device *phydev)
 783 {
 784         atomic_set(&phydev->irq_disable, 0);
 785         if (request_irq(phydev->irq, phy_interrupt,
 786                                 IRQF_SHARED,
 787                                 "phy_interrupt",
 788                                 phydev) < 0) {
 789                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 790                         phydev->mdio.bus->name, phydev->irq);
 791                 phydev->irq = PHY_POLL;
 792                 return 0;
 793         }
 794
 795         return phy_enable_interrupts(phydev);
 796 }
 797 EXPORT_SYMBOL(phy_start_interrupts);
 798
 799 /**
 800  * phy_stop_interrupts - disable interrupts from a PHY device
 801  * @phydev: target phy_device struct
 802  */
 803 int phy_stop_interrupts(struct phy_device *phydev)
 804 {
 805         int err = phy_disable_interrupts(phydev);
 806
 807         if (err)
 808                 phy_error(phydev);
 809
 810         free_irq(phydev->irq, phydev);
 811
 812         /* Cannot call flush_scheduled_work() here as desired because
 813          * of rtnl_lock(), but we do not really care about what would
 814          * be done, except from enable_irq(), so cancel any work
 815          * possibly pending and take care of the matter below.
 816          */
 817         cancel_work_sync(&phydev->phy_queue);
 818         /* If work indeed has been cancelled, disable_irq() will have
 819          * been left unbalanced from phy_interrupt() and enable_irq()
 820          * has to be called so that other devices on the line work.
 821          */
 822         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 823                 enable_irq(phydev->irq);
 824
 825         return err;
 826 }
 827 EXPORT_SYMBOL(phy_stop_interrupts);
 828
 829 /**
 830  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 831  * @work: work_struct that describes the work to be done
 832  */
 833 void phy_change(struct work_struct *work)
 834 {
 835         struct phy_device *phydev =
 836                 container_of(work, struct phy_device, phy_queue);
 837
 838         if (phy_interrupt_is_valid(phydev)) {
 839                 if (phydev->drv->did_interrupt &&
 840                     !phydev->drv->did_interrupt(phydev))
 841                         goto ignore;
 842
 843                 if (phy_disable_interrupts(phydev))
 844                         goto phy_err;
 845         }
 846
 847         mutex_lock(&phydev->lock);
 848         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 849                 phydev->state = PHY_CHANGELINK;
 850         mutex_unlock(&phydev->lock);
 851
 852         if (phy_interrupt_is_valid(phydev)) {
 853                 atomic_dec(&phydev->irq_disable);
 854                 enable_irq(phydev->irq);
 855
 856                 /* Reenable interrupts */
 857                 if (PHY_HALTED != phydev->state &&
 858                     phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 859                         goto irq_enable_err;
 860         }
 861
 862         /* reschedule state queue work to run as soon as possible */
 863         phy_trigger_machine(phydev, true);
 864         return;
 865
 866 ignore:
 867         atomic_dec(&phydev->irq_disable);
 868         enable_irq(phydev->irq);
 869         return;
 870
 871 irq_enable_err:
 872         disable_irq(phydev->irq);
 873         atomic_inc(&phydev->irq_disable);
 874 phy_err:
 875         phy_error(phydev);
 876 }
 877
 878 /**
 879  * phy_stop - Bring down the PHY link, and stop checking the status
 880  * @phydev: target phy_device struct
 881  */
 882 void phy_stop(struct phy_device *phydev)
 883 {
 884         mutex_lock(&phydev->lock);
 885
 886         if (PHY_HALTED == phydev->state)
 887                 goto out_unlock;
 888
 889         if (phy_interrupt_is_valid(phydev)) {
 890                 /* Disable PHY Interrupts */
 891                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 892
 893                 /* Clear any pending interrupts */
 894                 phy_clear_interrupt(phydev);
 895         }
 896
 897         phydev->state = PHY_HALTED;
 898
 899 out_unlock:
 900         mutex_unlock(&phydev->lock);
 901
 902         /* Cannot call flush_scheduled_work() here as desired because
 903          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 904          * will not reenable interrupts.
 905          */
 906 }
 907 EXPORT_SYMBOL(phy_stop);
 908
 909 /**
 910  * phy_start - start or restart a PHY device
 911  * @phydev: target phy_device struct
 912  *
 913  * Description: Indicates the attached device's readiness to
 914  *   handle PHY-related work.  Used during startup to start the
 915  *   PHY, and after a call to phy_stop() to resume operation.
 916  *   Also used to indicate the MDIO bus has cleared an error
 917  *   condition.
 918  */
 919 void phy_start(struct phy_device *phydev)
 920 {
 921         bool do_resume = false;
 922         int err = 0;
 923
 924         mutex_lock(&phydev->lock);
 925
 926         switch (phydev->state) {
 927         case PHY_STARTING:
 928                 phydev->state = PHY_PENDING;
 929                 break;
 930         case PHY_READY:
 931                 phydev->state = PHY_UP;
 932                 break;
 933         case PHY_HALTED:
 934                 /* make sure interrupts are re-enabled for the PHY */
 935                 if (phy_interrupt_is_valid(phydev)) {
 936                         err = phy_enable_interrupts(phydev);
 937                         if (err < 0)
 938                                 break;
 939                 }
 940
 941                 phydev->state = PHY_RESUMING;
 942                 do_resume = true;
 943                 break;
 944         default:
 945                 break;
 946         }
 947         mutex_unlock(&phydev->lock);
 948
 949         /* if phy was suspended, bring the physical link up again */
 950         if (do_resume)
 951                 phy_resume(phydev);
 952
 953         phy_trigger_machine(phydev, true);
 954 }
 955 EXPORT_SYMBOL(phy_start);
 956
 957 /**
 958  * phy_state_machine - Handle the state machine
 959  * @work: work_struct that describes the work to be done
 960  */
 961 void phy_state_machine(struct work_struct *work)
 962 {
 963         struct delayed_work *dwork = to_delayed_work(work);
 964         struct phy_device *phydev =
 965                         container_of(dwork, struct phy_device, state_queue);
 966         bool needs_aneg = false, do_suspend = false;
 967         enum phy_state old_state;
 968         int err = 0;
 969         int old_link;
 970
 971         mutex_lock(&phydev->lock);
 972
 973         old_state = phydev->state;
 974
 975         if (phydev->drv->link_change_notify)
 976                 phydev->drv->link_change_notify(phydev);
 977
 978         switch (phydev->state) {
 979         case PHY_DOWN:
 980         case PHY_STARTING:
 981         case PHY_READY:
 982         case PHY_PENDING:
 983                 break;
 984         case PHY_UP:
 985                 needs_aneg = true;
 986
 987                 phydev->link_timeout = PHY_AN_TIMEOUT;
 988
 989                 break;
 990         case PHY_AN:
 991                 err = phy_read_status(phydev);
 992                 if (err < 0)
 993                         break;
 994
 995                 /* If the link is down, give up on negotiation for now */
 996                 if (!phydev->link) {
 997                         phydev->state = PHY_NOLINK;
 998                         netif_carrier_off(phydev->attached_dev);
 999                         phydev->adjust_link(phydev->attached_dev);
1000                         break;
1001                 }
1002
1003                 /* Check if negotiation is done.  Break if there's an error */
1004                 err = phy_aneg_done(phydev);
1005                 if (err < 0)
1006                         break;
1007
1008                 /* If AN is done, we're running */
1009                 if (err > 0) {
1010                         phydev->state = PHY_RUNNING;
1011                         netif_carrier_on(phydev->attached_dev);
1012                         phydev->adjust_link(phydev->attached_dev);
1013
1014                 } else if (0 == phydev->link_timeout--)
1015                         needs_aneg = true;
1016                 break;
1017         case PHY_NOLINK:
1018                 if (phy_interrupt_is_valid(phydev))
1019                         break;
1020
1021                 err = phy_read_status(phydev);
1022                 if (err)
1023                         break;
1024
1025                 if (phydev->link) {
1026                         if (AUTONEG_ENABLE == phydev->autoneg) {
1027                                 err = phy_aneg_done(phydev);
1028                                 if (err < 0)
1029                                         break;
1030
1031                                 if (!err) {
1032                                         phydev->state = PHY_AN;
1033                                         phydev->link_timeout = PHY_AN_TIMEOUT;
1034                                         break;
1035                                 }
1036                         }
1037                         phydev->state = PHY_RUNNING;
1038                         netif_carrier_on(phydev->attached_dev);
1039                         phydev->adjust_link(phydev->attached_dev);
1040                 }
1041                 break;
1042         case PHY_FORCING:
1043                 err = genphy_update_link(phydev);
1044                 if (err)
1045                         break;
1046
1047                 if (phydev->link) {
1048                         phydev->state = PHY_RUNNING;
1049                         netif_carrier_on(phydev->attached_dev);
1050                 } else {
1051                         if (0 == phydev->link_timeout--)
1052                                 needs_aneg = true;
1053                 }
1054
1055                 phydev->adjust_link(phydev->attached_dev);
1056                 break;
1057         case PHY_RUNNING:
1058                 /* Only register a CHANGE if we are polling and link changed
1059                  * since latest checking.
1060                  */
1061                 if (phydev->irq == PHY_POLL) {
1062                         old_link = phydev->link;
1063                         err = phy_read_status(phydev);
1064                         if (err)
1065                                 break;
1066
1067                         if (old_link != phydev->link)
1068                                 phydev->state = PHY_CHANGELINK;
1069                 }
1070                 /*
1071                  * Failsafe: check that nobody set phydev->link=0 between two
1072                  * poll cycles, otherwise we won't leave RUNNING state as long
1073                  * as link remains down.
1074                  */
1075                 if (!phydev->link && phydev->state == PHY_RUNNING) {
1076                         phydev->state = PHY_CHANGELINK;
1077                         phydev_err(phydev, "no link in PHY_RUNNING\n");
1078                 }
1079                 break;
1080         case PHY_CHANGELINK:
1081                 err = phy_read_status(phydev);
1082                 if (err)
1083                         break;
1084
1085                 if (phydev->link) {
1086                         phydev->state = PHY_RUNNING;
1087                         netif_carrier_on(phydev->attached_dev);
1088                 } else {
1089                         phydev->state = PHY_NOLINK;
1090                         netif_carrier_off(phydev->attached_dev);
1091                 }
1092
1093                 phydev->adjust_link(phydev->attached_dev);
1094
1095                 if (phy_interrupt_is_valid(phydev))
1096                         err = phy_config_interrupt(phydev,
1097                                                    PHY_INTERRUPT_ENABLED);
1098                 break;
1099         case PHY_HALTED:
1100                 if (phydev->link) {
1101                         phydev->link = 0;
1102                         netif_carrier_off(phydev->attached_dev);
1103                         phydev->adjust_link(phydev->attached_dev);
1104                         do_suspend = true;
1105                 }
1106                 break;
1107         case PHY_RESUMING:
1108                 if (AUTONEG_ENABLE == phydev->autoneg) {
1109                         err = phy_aneg_done(phydev);
1110                         if (err < 0)
1111                                 break;
1112
1113                         /* err > 0 if AN is done.
1114                          * Otherwise, it's 0, and we're  still waiting for AN
1115                          */
1116                         if (err > 0) {
1117                                 err = phy_read_status(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                                         phydev->state = PHY_NOLINK;
1126                                 }
1127                                 phydev->adjust_link(phydev->attached_dev);
1128                         } else {
1129                                 phydev->state = PHY_AN;
1130                                 phydev->link_timeout = PHY_AN_TIMEOUT;
1131                         }
1132                 } else {
1133                         err = phy_read_status(phydev);
1134                         if (err)
1135                                 break;
1136
1137                         if (phydev->link) {
1138                                 phydev->state = PHY_RUNNING;
1139                                 netif_carrier_on(phydev->attached_dev);
1140                         } else  {
1141                                 phydev->state = PHY_NOLINK;
1142                         }
1143                         phydev->adjust_link(phydev->attached_dev);
1144                 }
1145                 break;
1146         }
1147
1148         mutex_unlock(&phydev->lock);
1149
1150         if (needs_aneg)
1151                 err = phy_start_aneg_priv(phydev, false);
1152         else if (do_suspend)
1153                 phy_suspend(phydev);
1154
1155         if (err < 0)
1156                 phy_error(phydev);
1157
1158         phydev_dbg(phydev, "PHY state change %s -> %s\n",
1159                    phy_state_to_str(old_state),
1160                    phy_state_to_str(phydev->state));
1161
1162         /* Only re-schedule a PHY state machine change if we are polling the
1163          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
1164          * between states from phy_mac_interrupt()
1165          */
1166         if (phydev->irq == PHY_POLL)
1167                 queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1168                                    PHY_STATE_TIME * HZ);
1169 }
1170
1171 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
1172 {
1173         phydev->link = new_link;
1174
1175         /* Trigger a state machine change */
1176         queue_work(system_power_efficient_wq, &phydev->phy_queue);
1177 }
1178 EXPORT_SYMBOL(phy_mac_interrupt);
1179
1180 static inline void mmd_phy_indirect(struct mii_bus *bus, int prtad, int devad,
1181                                     int addr)
1182 {
1183         /* Write the desired MMD Devad */
1184         bus->write(bus, addr, MII_MMD_CTRL, devad);
1185
1186         /* Write the desired MMD register address */
1187         bus->write(bus, addr, MII_MMD_DATA, prtad);
1188
1189         /* Select the Function : DATA with no post increment */
1190         bus->write(bus, addr, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
1191 }
1192
1193 /**
1194  * phy_read_mmd_indirect - reads data from the MMD registers
1195  * @phydev: The PHY device bus
1196  * @prtad: MMD Address
1197  * @devad: MMD DEVAD
1198  *
1199  * Description: it reads data from the MMD registers (clause 22 to access to
1200  * clause 45) of the specified phy address.
1201  * To read these register we have:
1202  * 1) Write reg 13 // DEVAD
1203  * 2) Write reg 14 // MMD Address
1204  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1205  * 3) Read  reg 14 // Read MMD data
1206  */
1207 int phy_read_mmd_indirect(struct phy_device *phydev, int prtad, int devad)
1208 {
1209         struct phy_driver *phydrv = phydev->drv;
1210         int addr = phydev->mdio.addr;
1211         int value = -1;
1212
1213         if (!phydrv->read_mmd_indirect) {
1214                 struct mii_bus *bus = phydev->mdio.bus;
1215
1216                 mutex_lock(&bus->mdio_lock);
1217                 mmd_phy_indirect(bus, prtad, devad, addr);
1218
1219                 /* Read the content of the MMD's selected register */
1220                 value = bus->read(bus, addr, MII_MMD_DATA);
1221                 mutex_unlock(&bus->mdio_lock);
1222         } else {
1223                 value = phydrv->read_mmd_indirect(phydev, prtad, devad, addr);
1224         }
1225         return value;
1226 }
1227 EXPORT_SYMBOL(phy_read_mmd_indirect);
1228
1229 /**
1230  * phy_write_mmd_indirect - writes data to the MMD registers
1231  * @phydev: The PHY device
1232  * @prtad: MMD Address
1233  * @devad: MMD DEVAD
1234  * @data: data to write in the MMD register
1235  *
1236  * Description: Write data from the MMD registers of the specified
1237  * phy address.
1238  * To write these register we have:
1239  * 1) Write reg 13 // DEVAD
1240  * 2) Write reg 14 // MMD Address
1241  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1242  * 3) Write reg 14 // Write MMD data
1243  */
1244 void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
1245                                    int devad, u32 data)
1246 {
1247         struct phy_driver *phydrv = phydev->drv;
1248         int addr = phydev->mdio.addr;
1249
1250         if (!phydrv->write_mmd_indirect) {
1251                 struct mii_bus *bus = phydev->mdio.bus;
1252
1253                 mutex_lock(&bus->mdio_lock);
1254                 mmd_phy_indirect(bus, prtad, devad, addr);
1255
1256                 /* Write the data into MMD's selected register */
1257                 bus->write(bus, addr, MII_MMD_DATA, data);
1258                 mutex_unlock(&bus->mdio_lock);
1259         } else {
1260                 phydrv->write_mmd_indirect(phydev, prtad, devad, addr, data);
1261         }
1262 }
1263 EXPORT_SYMBOL(phy_write_mmd_indirect);
1264
1265 /**
1266  * phy_init_eee - init and check the EEE feature
1267  * @phydev: target phy_device struct
1268  * @clk_stop_enable: PHY may stop the clock during LPI
1269  *
1270  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1271  * is supported by looking at the MMD registers 3.20 and 7.60/61
1272  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1273  * bit if required.
1274  */
1275 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1276 {
1277         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1278          * Also EEE feature is active when core is operating with MII, GMII
1279          * or RGMII (all kinds). Internal PHYs are also allowed to proceed and
1280          * should return an error if they do not support EEE.
1281          */
1282         if ((phydev->duplex == DUPLEX_FULL) &&
1283             ((phydev->interface == PHY_INTERFACE_MODE_MII) ||
1284             (phydev->interface == PHY_INTERFACE_MODE_GMII) ||
1285              phy_interface_is_rgmii(phydev) ||
1286              phy_is_internal(phydev))) {
1287                 int eee_lp, eee_cap, eee_adv;
1288                 u32 lp, cap, adv;
1289                 int status;
1290
1291                 /* Read phy status to properly get the right settings */
1292                 status = phy_read_status(phydev);
1293                 if (status)
1294                         return status;
1295
1296                 /* First check if the EEE ability is supported */
1297                 eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1298                                                 MDIO_MMD_PCS);
1299                 if (eee_cap <= 0)
1300                         goto eee_exit_err;
1301
1302                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1303                 if (!cap)
1304                         goto eee_exit_err;
1305
1306                 /* Check which link settings negotiated and verify it in
1307                  * the EEE advertising registers.
1308                  */
1309                 eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1310                                                MDIO_MMD_AN);
1311                 if (eee_lp <= 0)
1312                         goto eee_exit_err;
1313
1314                 eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1315                                                 MDIO_MMD_AN);
1316                 if (eee_adv <= 0)
1317                         goto eee_exit_err;
1318
1319                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1320                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1321                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1322                         goto eee_exit_err;
1323
1324                 if (clk_stop_enable) {
1325                         /* Configure the PHY to stop receiving xMII
1326                          * clock while it is signaling LPI.
1327                          */
1328                         int val = phy_read_mmd_indirect(phydev, MDIO_CTRL1,
1329                                                         MDIO_MMD_PCS);
1330                         if (val < 0)
1331                                 return val;
1332
1333                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1334                         phy_write_mmd_indirect(phydev, MDIO_CTRL1,
1335                                                MDIO_MMD_PCS, val);
1336                 }
1337
1338                 return 0; /* EEE supported */
1339         }
1340 eee_exit_err:
1341         return -EPROTONOSUPPORT;
1342 }
1343 EXPORT_SYMBOL(phy_init_eee);
1344
1345 /**
1346  * phy_get_eee_err - report the EEE wake error count
1347  * @phydev: target phy_device struct
1348  *
1349  * Description: it is to report the number of time where the PHY
1350  * failed to complete its normal wake sequence.
1351  */
1352 int phy_get_eee_err(struct phy_device *phydev)
1353 {
1354         return phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_WK_ERR, MDIO_MMD_PCS);
1355 }
1356 EXPORT_SYMBOL(phy_get_eee_err);
1357
1358 /**
1359  * phy_ethtool_get_eee - get EEE supported and status
1360  * @phydev: target phy_device struct
1361  * @data: ethtool_eee data
1362  *
1363  * Description: it reportes the Supported/Advertisement/LP Advertisement
1364  * capabilities.
1365  */
1366 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1367 {
1368         int val;
1369
1370         /* Get Supported EEE */
1371         val = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE, MDIO_MMD_PCS);
1372         if (val < 0)
1373                 return val;
1374         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1375
1376         /* Get advertisement EEE */
1377         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN);
1378         if (val < 0)
1379                 return val;
1380         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1381
1382         /* Get LP advertisement EEE */
1383         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE, MDIO_MMD_AN);
1384         if (val < 0)
1385                 return val;
1386         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1387
1388         return 0;
1389 }
1390 EXPORT_SYMBOL(phy_ethtool_get_eee);
1391
1392 /**
1393  * phy_ethtool_set_eee - set EEE supported and status
1394  * @phydev: target phy_device struct
1395  * @data: ethtool_eee data
1396  *
1397  * Description: it is to program the Advertisement EEE register.
1398  */
1399 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1400 {
1401         int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
1402
1403         /* Mask prohibited EEE modes */
1404         val &= ~phydev->eee_broken_modes;
1405
1406         phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, val);
1407
1408         return 0;
1409 }
1410 EXPORT_SYMBOL(phy_ethtool_set_eee);
1411
1412 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1413 {
1414         if (phydev->drv->set_wol)
1415                 return phydev->drv->set_wol(phydev, wol);
1416
1417         return -EOPNOTSUPP;
1418 }
1419 EXPORT_SYMBOL(phy_ethtool_set_wol);
1420
1421 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1422 {
1423         if (phydev->drv->get_wol)
1424                 phydev->drv->get_wol(phydev, wol);
1425 }
1426 EXPORT_SYMBOL(phy_ethtool_get_wol);
1427
1428 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1429                                    struct ethtool_link_ksettings *cmd)
1430 {
1431         struct phy_device *phydev = ndev->phydev;
1432
1433         if (!phydev)
1434                 return -ENODEV;
1435
1436         return phy_ethtool_ksettings_get(phydev, cmd);
1437 }
1438 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1439
1440 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1441                                    const struct ethtool_link_ksettings *cmd)
1442 {
1443         struct phy_device *phydev = ndev->phydev;
1444
1445         if (!phydev)
1446                 return -ENODEV;
1447
1448         return phy_ethtool_ksettings_set(phydev, cmd);
1449 }
1450 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);