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         return genphy_aneg_done(phydev);
 152 }
 153
 154 /* A structure for mapping a particular speed and duplex
 155  * combination to a particular SUPPORTED and ADVERTISED value
 156  */
 157 struct phy_setting {
 158         int speed;
 159         int duplex;
 160         u32 setting;
 161 };
 162
 163 /* A mapping of all SUPPORTED settings to speed/duplex */
 164 static const struct phy_setting settings[] = {
 165         {
 166                 .speed = SPEED_10000,
 167                 .duplex = DUPLEX_FULL,
 168                 .setting = SUPPORTED_10000baseKR_Full,
 169         },
 170         {
 171                 .speed = SPEED_10000,
 172                 .duplex = DUPLEX_FULL,
 173                 .setting = SUPPORTED_10000baseKX4_Full,
 174         },
 175         {
 176                 .speed = SPEED_10000,
 177                 .duplex = DUPLEX_FULL,
 178                 .setting = SUPPORTED_10000baseT_Full,
 179         },
 180         {
 181                 .speed = SPEED_2500,
 182                 .duplex = DUPLEX_FULL,
 183                 .setting = SUPPORTED_2500baseX_Full,
 184         },
 185         {
 186                 .speed = SPEED_1000,
 187                 .duplex = DUPLEX_FULL,
 188                 .setting = SUPPORTED_1000baseKX_Full,
 189         },
 190         {
 191                 .speed = SPEED_1000,
 192                 .duplex = DUPLEX_FULL,
 193                 .setting = SUPPORTED_1000baseT_Full,
 194         },
 195         {
 196                 .speed = SPEED_1000,
 197                 .duplex = DUPLEX_HALF,
 198                 .setting = SUPPORTED_1000baseT_Half,
 199         },
 200         {
 201                 .speed = SPEED_100,
 202                 .duplex = DUPLEX_FULL,
 203                 .setting = SUPPORTED_100baseT_Full,
 204         },
 205         {
 206                 .speed = SPEED_100,
 207                 .duplex = DUPLEX_HALF,
 208                 .setting = SUPPORTED_100baseT_Half,
 209         },
 210         {
 211                 .speed = SPEED_10,
 212                 .duplex = DUPLEX_FULL,
 213                 .setting = SUPPORTED_10baseT_Full,
 214         },
 215         {
 216                 .speed = SPEED_10,
 217                 .duplex = DUPLEX_HALF,
 218                 .setting = SUPPORTED_10baseT_Half,
 219         },
 220 };
 221
 222 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 223
 224 /**
 225  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 226  * @speed: speed to match
 227  * @duplex: duplex to match
 228  *
 229  * Description: Searches the settings array for the setting which
 230  *   matches the desired speed and duplex, and returns the index
 231  *   of that setting.  Returns the index of the last setting if
 232  *   none of the others match.
 233  */
 234 static inline unsigned int phy_find_setting(int speed, int duplex)
 235 {
 236         unsigned int idx = 0;
 237
 238         while (idx < ARRAY_SIZE(settings) &&
 239                (settings[idx].speed != speed || settings[idx].duplex != duplex))
 240                 idx++;
 241
 242         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 243 }
 244
 245 /**
 246  * phy_find_valid - find a PHY setting that matches the requested features mask
 247  * @idx: The first index in settings[] to search
 248  * @features: A mask of the valid settings
 249  *
 250  * Description: Returns the index of the first valid setting less
 251  *   than or equal to the one pointed to by idx, as determined by
 252  *   the mask in features.  Returns the index of the last setting
 253  *   if nothing else matches.
 254  */
 255 static inline unsigned int phy_find_valid(unsigned int idx, u32 features)
 256 {
 257         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 258                 idx++;
 259
 260         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 261 }
 262
 263 /**
 264  * phy_check_valid - check if there is a valid PHY setting which matches
 265  *                   speed, duplex, and feature mask
 266  * @speed: speed to match
 267  * @duplex: duplex to match
 268  * @features: A mask of the valid settings
 269  *
 270  * Description: Returns true if there is a valid setting, false otherwise.
 271  */
 272 static inline bool phy_check_valid(int speed, int duplex, u32 features)
 273 {
 274         unsigned int idx;
 275
 276         idx = phy_find_valid(phy_find_setting(speed, duplex), features);
 277
 278         return settings[idx].speed == speed && settings[idx].duplex == duplex &&
 279                 (settings[idx].setting & features);
 280 }
 281
 282 /**
 283  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 284  * @phydev: the target phy_device struct
 285  *
 286  * Description: Make sure the PHY is set to supported speeds and
 287  *   duplexes.  Drop down by one in this order:  1000/FULL,
 288  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 289  */
 290 static void phy_sanitize_settings(struct phy_device *phydev)
 291 {
 292         u32 features = phydev->supported;
 293         unsigned int idx;
 294
 295         /* Sanitize settings based on PHY capabilities */
 296         if ((features & SUPPORTED_Autoneg) == 0)
 297                 phydev->autoneg = AUTONEG_DISABLE;
 298
 299         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 300                         features);
 301
 302         phydev->speed = settings[idx].speed;
 303         phydev->duplex = settings[idx].duplex;
 304 }
 305
 306 /**
 307  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 308  * @phydev: target phy_device struct
 309  * @cmd: ethtool_cmd
 310  *
 311  * A few notes about parameter checking:
 312  * - We don't set port or transceiver, so we don't care what they
 313  *   were set to.
 314  * - phy_start_aneg() will make sure forced settings are sane, and
 315  *   choose the next best ones from the ones selected, so we don't
 316  *   care if ethtool tries to give us bad values.
 317  */
 318 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 319 {
 320         u32 speed = ethtool_cmd_speed(cmd);
 321
 322         if (cmd->phy_address != phydev->mdio.addr)
 323                 return -EINVAL;
 324
 325         /* We make sure that we don't pass unsupported values in to the PHY */
 326         cmd->advertising &= phydev->supported;
 327
 328         /* Verify the settings we care about. */
 329         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 330                 return -EINVAL;
 331
 332         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 333                 return -EINVAL;
 334
 335         if (cmd->autoneg == AUTONEG_DISABLE &&
 336             ((speed != SPEED_1000 &&
 337               speed != SPEED_100 &&
 338               speed != SPEED_10) ||
 339              (cmd->duplex != DUPLEX_HALF &&
 340               cmd->duplex != DUPLEX_FULL)))
 341                 return -EINVAL;
 342
 343         phydev->autoneg = cmd->autoneg;
 344
 345         phydev->speed = speed;
 346
 347         phydev->advertising = cmd->advertising;
 348
 349         if (AUTONEG_ENABLE == cmd->autoneg)
 350                 phydev->advertising |= ADVERTISED_Autoneg;
 351         else
 352                 phydev->advertising &= ~ADVERTISED_Autoneg;
 353
 354         phydev->duplex = cmd->duplex;
 355
 356         phydev->mdix = cmd->eth_tp_mdix_ctrl;
 357
 358         /* Restart the PHY */
 359         phy_start_aneg(phydev);
 360
 361         return 0;
 362 }
 363 EXPORT_SYMBOL(phy_ethtool_sset);
 364
 365 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 366 {
 367         cmd->supported = phydev->supported;
 368
 369         cmd->advertising = phydev->advertising;
 370         cmd->lp_advertising = phydev->lp_advertising;
 371
 372         ethtool_cmd_speed_set(cmd, phydev->speed);
 373         cmd->duplex = phydev->duplex;
 374         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 375                 cmd->port = PORT_BNC;
 376         else
 377                 cmd->port = PORT_MII;
 378         cmd->phy_address = phydev->mdio.addr;
 379         cmd->transceiver = phy_is_internal(phydev) ?
 380                 XCVR_INTERNAL : XCVR_EXTERNAL;
 381         cmd->autoneg = phydev->autoneg;
 382         cmd->eth_tp_mdix_ctrl = phydev->mdix;
 383
 384         return 0;
 385 }
 386 EXPORT_SYMBOL(phy_ethtool_gset);
 387
 388 /**
 389  * phy_mii_ioctl - generic PHY MII ioctl interface
 390  * @phydev: the phy_device struct
 391  * @ifr: &struct ifreq for socket ioctl's
 392  * @cmd: ioctl cmd to execute
 393  *
 394  * Note that this function is currently incompatible with the
 395  * PHYCONTROL layer.  It changes registers without regard to
 396  * current state.  Use at own risk.
 397  */
 398 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 399 {
 400         struct mii_ioctl_data *mii_data = if_mii(ifr);
 401         u16 val = mii_data->val_in;
 402         bool change_autoneg = false;
 403
 404         switch (cmd) {
 405         case SIOCGMIIPHY:
 406                 mii_data->phy_id = phydev->mdio.addr;
 407                 /* fall through */
 408
 409         case SIOCGMIIREG:
 410                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 411                                                  mii_data->phy_id,
 412                                                  mii_data->reg_num);
 413                 return 0;
 414
 415         case SIOCSMIIREG:
 416                 if (mii_data->phy_id == phydev->mdio.addr) {
 417                         switch (mii_data->reg_num) {
 418                         case MII_BMCR:
 419                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 420                                         if (phydev->autoneg == AUTONEG_ENABLE)
 421                                                 change_autoneg = true;
 422                                         phydev->autoneg = AUTONEG_DISABLE;
 423                                         if (val & BMCR_FULLDPLX)
 424                                                 phydev->duplex = DUPLEX_FULL;
 425                                         else
 426                                                 phydev->duplex = DUPLEX_HALF;
 427                                         if (val & BMCR_SPEED1000)
 428                                                 phydev->speed = SPEED_1000;
 429                                         else if (val & BMCR_SPEED100)
 430                                                 phydev->speed = SPEED_100;
 431                                         else phydev->speed = SPEED_10;
 432                                 }
 433                                 else {
 434                                         if (phydev->autoneg == AUTONEG_DISABLE)
 435                                                 change_autoneg = true;
 436                                         phydev->autoneg = AUTONEG_ENABLE;
 437                                 }
 438                                 break;
 439                         case MII_ADVERTISE:
 440                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 441                                 change_autoneg = true;
 442                                 break;
 443                         default:
 444                                 /* do nothing */
 445                                 break;
 446                         }
 447                 }
 448
 449                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 450                               mii_data->reg_num, val);
 451
 452                 if (mii_data->phy_id == phydev->mdio.addr &&
 453                     mii_data->reg_num == MII_BMCR &&
 454                     val & BMCR_RESET)
 455                         return phy_init_hw(phydev);
 456
 457                 if (change_autoneg)
 458                         return phy_start_aneg(phydev);
 459
 460                 return 0;
 461
 462         case SIOCSHWTSTAMP:
 463                 if (phydev->drv->hwtstamp)
 464                         return phydev->drv->hwtstamp(phydev, ifr);
 465                 /* fall through */
 466
 467         default:
 468                 return -EOPNOTSUPP;
 469         }
 470 }
 471 EXPORT_SYMBOL(phy_mii_ioctl);
 472
 473 /**
 474  * phy_start_aneg - start auto-negotiation for this PHY device
 475  * @phydev: the phy_device struct
 476  *
 477  * Description: Sanitizes the settings (if we're not autonegotiating
 478  *   them), and then calls the driver's config_aneg function.
 479  *   If the PHYCONTROL Layer is operating, we change the state to
 480  *   reflect the beginning of Auto-negotiation or forcing.
 481  */
 482 int phy_start_aneg(struct phy_device *phydev)
 483 {
 484         int err;
 485
 486         mutex_lock(&phydev->lock);
 487
 488         if (AUTONEG_DISABLE == phydev->autoneg)
 489                 phy_sanitize_settings(phydev);
 490
 491         /* Invalidate LP advertising flags */
 492         phydev->lp_advertising = 0;
 493
 494         err = phydev->drv->config_aneg(phydev);
 495         if (err < 0)
 496                 goto out_unlock;
 497
 498         if (phydev->state != PHY_HALTED) {
 499                 if (AUTONEG_ENABLE == phydev->autoneg) {
 500                         phydev->state = PHY_AN;
 501                         phydev->link_timeout = PHY_AN_TIMEOUT;
 502                 } else {
 503                         phydev->state = PHY_FORCING;
 504                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 505                 }
 506         }
 507
 508 out_unlock:
 509         mutex_unlock(&phydev->lock);
 510         return err;
 511 }
 512 EXPORT_SYMBOL(phy_start_aneg);
 513
 514 /**
 515  * phy_start_machine - start PHY state machine tracking
 516  * @phydev: the phy_device struct
 517  *
 518  * Description: The PHY infrastructure can run a state machine
 519  *   which tracks whether the PHY is starting up, negotiating,
 520  *   etc.  This function starts the timer which tracks the state
 521  *   of the PHY.  If you want to maintain your own state machine,
 522  *   do not call this function.
 523  */
 524 void phy_start_machine(struct phy_device *phydev)
 525 {
 526         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 527 }
 528
 529 /**
 530  * phy_stop_machine - stop the PHY state machine tracking
 531  * @phydev: target phy_device struct
 532  *
 533  * Description: Stops the state machine timer, sets the state to UP
 534  *   (unless it wasn't up yet). This function must be called BEFORE
 535  *   phy_detach.
 536  */
 537 void phy_stop_machine(struct phy_device *phydev)
 538 {
 539         cancel_delayed_work_sync(&phydev->state_queue);
 540
 541         mutex_lock(&phydev->lock);
 542         if (phydev->state > PHY_UP)
 543                 phydev->state = PHY_UP;
 544         mutex_unlock(&phydev->lock);
 545 }
 546
 547 /**
 548  * phy_error - enter HALTED state for this PHY device
 549  * @phydev: target phy_device struct
 550  *
 551  * Moves the PHY to the HALTED state in response to a read
 552  * or write error, and tells the controller the link is down.
 553  * Must not be called from interrupt context, or while the
 554  * phydev->lock is held.
 555  */
 556 static void phy_error(struct phy_device *phydev)
 557 {
 558         mutex_lock(&phydev->lock);
 559         phydev->state = PHY_HALTED;
 560         mutex_unlock(&phydev->lock);
 561 }
 562
 563 /**
 564  * phy_interrupt - PHY interrupt handler
 565  * @irq: interrupt line
 566  * @phy_dat: phy_device pointer
 567  *
 568  * Description: When a PHY interrupt occurs, the handler disables
 569  * interrupts, and schedules a work task to clear the interrupt.
 570  */
 571 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 572 {
 573         struct phy_device *phydev = phy_dat;
 574
 575         if (PHY_HALTED == phydev->state)
 576                 return IRQ_NONE;                /* It can't be ours.  */
 577
 578         /* The MDIO bus is not allowed to be written in interrupt
 579          * context, so we need to disable the irq here.  A work
 580          * queue will write the PHY to disable and clear the
 581          * interrupt, and then reenable the irq line.
 582          */
 583         disable_irq_nosync(irq);
 584         atomic_inc(&phydev->irq_disable);
 585
 586         queue_work(system_power_efficient_wq, &phydev->phy_queue);
 587
 588         return IRQ_HANDLED;
 589 }
 590
 591 /**
 592  * phy_enable_interrupts - Enable the interrupts from the PHY side
 593  * @phydev: target phy_device struct
 594  */
 595 static int phy_enable_interrupts(struct phy_device *phydev)
 596 {
 597         int err = phy_clear_interrupt(phydev);
 598
 599         if (err < 0)
 600                 return err;
 601
 602         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 603 }
 604
 605 /**
 606  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 607  * @phydev: target phy_device struct
 608  */
 609 static int phy_disable_interrupts(struct phy_device *phydev)
 610 {
 611         int err;
 612
 613         /* Disable PHY interrupts */
 614         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 615         if (err)
 616                 goto phy_err;
 617
 618         /* Clear the interrupt */
 619         err = phy_clear_interrupt(phydev);
 620         if (err)
 621                 goto phy_err;
 622
 623         return 0;
 624
 625 phy_err:
 626         phy_error(phydev);
 627
 628         return err;
 629 }
 630
 631 /**
 632  * phy_start_interrupts - request and enable interrupts for a PHY device
 633  * @phydev: target phy_device struct
 634  *
 635  * Description: Request the interrupt for the given PHY.
 636  *   If this fails, then we set irq to PHY_POLL.
 637  *   Otherwise, we enable the interrupts in the PHY.
 638  *   This should only be called with a valid IRQ number.
 639  *   Returns 0 on success or < 0 on error.
 640  */
 641 int phy_start_interrupts(struct phy_device *phydev)
 642 {
 643         atomic_set(&phydev->irq_disable, 0);
 644         if (request_irq(phydev->irq, phy_interrupt, 0, "phy_interrupt",
 645                         phydev) < 0) {
 646                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 647                         phydev->mdio.bus->name, phydev->irq);
 648                 phydev->irq = PHY_POLL;
 649                 return 0;
 650         }
 651
 652         return phy_enable_interrupts(phydev);
 653 }
 654 EXPORT_SYMBOL(phy_start_interrupts);
 655
 656 /**
 657  * phy_stop_interrupts - disable interrupts from a PHY device
 658  * @phydev: target phy_device struct
 659  */
 660 int phy_stop_interrupts(struct phy_device *phydev)
 661 {
 662         int err = phy_disable_interrupts(phydev);
 663
 664         if (err)
 665                 phy_error(phydev);
 666
 667         free_irq(phydev->irq, phydev);
 668
 669         /* Cannot call flush_scheduled_work() here as desired because
 670          * of rtnl_lock(), but we do not really care about what would
 671          * be done, except from enable_irq(), so cancel any work
 672          * possibly pending and take care of the matter below.
 673          */
 674         cancel_work_sync(&phydev->phy_queue);
 675         /* If work indeed has been cancelled, disable_irq() will have
 676          * been left unbalanced from phy_interrupt() and enable_irq()
 677          * has to be called so that other devices on the line work.
 678          */
 679         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 680                 enable_irq(phydev->irq);
 681
 682         return err;
 683 }
 684 EXPORT_SYMBOL(phy_stop_interrupts);
 685
 686 /**
 687  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 688  * @work: work_struct that describes the work to be done
 689  */
 690 void phy_change(struct work_struct *work)
 691 {
 692         struct phy_device *phydev =
 693                 container_of(work, struct phy_device, phy_queue);
 694
 695         if (phydev->drv->did_interrupt &&
 696             !phydev->drv->did_interrupt(phydev))
 697                 goto ignore;
 698
 699         if (phy_disable_interrupts(phydev))
 700                 goto phy_err;
 701
 702         mutex_lock(&phydev->lock);
 703         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 704                 phydev->state = PHY_CHANGELINK;
 705         mutex_unlock(&phydev->lock);
 706
 707         atomic_dec(&phydev->irq_disable);
 708         enable_irq(phydev->irq);
 709
 710         /* Reenable interrupts */
 711         if (PHY_HALTED != phydev->state &&
 712             phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 713                 goto irq_enable_err;
 714
 715         /* reschedule state queue work to run as soon as possible */
 716         cancel_delayed_work_sync(&phydev->state_queue);
 717         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 718         return;
 719
 720 ignore:
 721         atomic_dec(&phydev->irq_disable);
 722         enable_irq(phydev->irq);
 723         return;
 724
 725 irq_enable_err:
 726         disable_irq(phydev->irq);
 727         atomic_inc(&phydev->irq_disable);
 728 phy_err:
 729         phy_error(phydev);
 730 }
 731
 732 /**
 733  * phy_stop - Bring down the PHY link, and stop checking the status
 734  * @phydev: target phy_device struct
 735  */
 736 void phy_stop(struct phy_device *phydev)
 737 {
 738         mutex_lock(&phydev->lock);
 739
 740         if (PHY_HALTED == phydev->state)
 741                 goto out_unlock;
 742
 743         if (phy_interrupt_is_valid(phydev)) {
 744                 /* Disable PHY Interrupts */
 745                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 746
 747                 /* Clear any pending interrupts */
 748                 phy_clear_interrupt(phydev);
 749         }
 750
 751         phydev->state = PHY_HALTED;
 752
 753 out_unlock:
 754         mutex_unlock(&phydev->lock);
 755
 756         /* Cannot call flush_scheduled_work() here as desired because
 757          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 758          * will not reenable interrupts.
 759          */
 760 }
 761 EXPORT_SYMBOL(phy_stop);
 762
 763 /**
 764  * phy_start - start or restart a PHY device
 765  * @phydev: target phy_device struct
 766  *
 767  * Description: Indicates the attached device's readiness to
 768  *   handle PHY-related work.  Used during startup to start the
 769  *   PHY, and after a call to phy_stop() to resume operation.
 770  *   Also used to indicate the MDIO bus has cleared an error
 771  *   condition.
 772  */
 773 void phy_start(struct phy_device *phydev)
 774 {
 775         bool do_resume = false;
 776         int err = 0;
 777
 778         mutex_lock(&phydev->lock);
 779
 780         switch (phydev->state) {
 781         case PHY_STARTING:
 782                 phydev->state = PHY_PENDING;
 783                 break;
 784         case PHY_READY:
 785                 phydev->state = PHY_UP;
 786                 break;
 787         case PHY_HALTED:
 788                 /* make sure interrupts are re-enabled for the PHY */
 789                 err = phy_enable_interrupts(phydev);
 790                 if (err < 0)
 791                         break;
 792
 793                 phydev->state = PHY_RESUMING;
 794                 do_resume = true;
 795                 break;
 796         default:
 797                 break;
 798         }
 799         mutex_unlock(&phydev->lock);
 800
 801         /* if phy was suspended, bring the physical link up again */
 802         if (do_resume)
 803                 phy_resume(phydev);
 804 }
 805 EXPORT_SYMBOL(phy_start);
 806
 807 /**
 808  * phy_state_machine - Handle the state machine
 809  * @work: work_struct that describes the work to be done
 810  */
 811 void phy_state_machine(struct work_struct *work)
 812 {
 813         struct delayed_work *dwork = to_delayed_work(work);
 814         struct phy_device *phydev =
 815                         container_of(dwork, struct phy_device, state_queue);
 816         bool needs_aneg = false, do_suspend = false;
 817         enum phy_state old_state;
 818         int err = 0;
 819         int old_link;
 820
 821         mutex_lock(&phydev->lock);
 822
 823         old_state = phydev->state;
 824
 825         if (phydev->drv->link_change_notify)
 826                 phydev->drv->link_change_notify(phydev);
 827
 828         switch (phydev->state) {
 829         case PHY_DOWN:
 830         case PHY_STARTING:
 831         case PHY_READY:
 832         case PHY_PENDING:
 833                 break;
 834         case PHY_UP:
 835                 needs_aneg = true;
 836
 837                 phydev->link_timeout = PHY_AN_TIMEOUT;
 838
 839                 break;
 840         case PHY_AN:
 841                 err = phy_read_status(phydev);
 842                 if (err < 0)
 843                         break;
 844
 845                 /* If the link is down, give up on negotiation for now */
 846                 if (!phydev->link) {
 847                         phydev->state = PHY_NOLINK;
 848                         netif_carrier_off(phydev->attached_dev);
 849                         phydev->adjust_link(phydev->attached_dev);
 850                         break;
 851                 }
 852
 853                 /* Check if negotiation is done.  Break if there's an error */
 854                 err = phy_aneg_done(phydev);
 855                 if (err < 0)
 856                         break;
 857
 858                 /* If AN is done, we're running */
 859                 if (err > 0) {
 860                         phydev->state = PHY_RUNNING;
 861                         netif_carrier_on(phydev->attached_dev);
 862                         phydev->adjust_link(phydev->attached_dev);
 863
 864                 } else if (0 == phydev->link_timeout--)
 865                         needs_aneg = true;
 866                 break;
 867         case PHY_NOLINK:
 868                 if (phy_interrupt_is_valid(phydev))
 869                         break;
 870
 871                 err = phy_read_status(phydev);
 872                 if (err)
 873                         break;
 874
 875                 if (phydev->link) {
 876                         if (AUTONEG_ENABLE == phydev->autoneg) {
 877                                 err = phy_aneg_done(phydev);
 878                                 if (err < 0)
 879                                         break;
 880
 881                                 if (!err) {
 882                                         phydev->state = PHY_AN;
 883                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 884                                         break;
 885                                 }
 886                         }
 887                         phydev->state = PHY_RUNNING;
 888                         netif_carrier_on(phydev->attached_dev);
 889                         phydev->adjust_link(phydev->attached_dev);
 890                 }
 891                 break;
 892         case PHY_FORCING:
 893                 err = genphy_update_link(phydev);
 894                 if (err)
 895                         break;
 896
 897                 if (phydev->link) {
 898                         phydev->state = PHY_RUNNING;
 899                         netif_carrier_on(phydev->attached_dev);
 900                 } else {
 901                         if (0 == phydev->link_timeout--)
 902                                 needs_aneg = true;
 903                 }
 904
 905                 phydev->adjust_link(phydev->attached_dev);
 906                 break;
 907         case PHY_RUNNING:
 908                 /* Only register a CHANGE if we are polling or ignoring
 909                  * interrupts and link changed since latest checking.
 910                  */
 911                 if (!phy_interrupt_is_valid(phydev)) {
 912                         old_link = phydev->link;
 913                         err = phy_read_status(phydev);
 914                         if (err)
 915                                 break;
 916
 917                         if (old_link != phydev->link)
 918                                 phydev->state = PHY_CHANGELINK;
 919                 }
 920                 break;
 921         case PHY_CHANGELINK:
 922                 err = phy_read_status(phydev);
 923                 if (err)
 924                         break;
 925
 926                 if (phydev->link) {
 927                         phydev->state = PHY_RUNNING;
 928                         netif_carrier_on(phydev->attached_dev);
 929                 } else {
 930                         phydev->state = PHY_NOLINK;
 931                         netif_carrier_off(phydev->attached_dev);
 932                 }
 933
 934                 phydev->adjust_link(phydev->attached_dev);
 935
 936                 if (phy_interrupt_is_valid(phydev))
 937                         err = phy_config_interrupt(phydev,
 938                                                    PHY_INTERRUPT_ENABLED);
 939                 break;
 940         case PHY_HALTED:
 941                 if (phydev->link) {
 942                         phydev->link = 0;
 943                         netif_carrier_off(phydev->attached_dev);
 944                         phydev->adjust_link(phydev->attached_dev);
 945                         do_suspend = true;
 946                 }
 947                 break;
 948         case PHY_RESUMING:
 949                 if (AUTONEG_ENABLE == phydev->autoneg) {
 950                         err = phy_aneg_done(phydev);
 951                         if (err < 0)
 952                                 break;
 953
 954                         /* err > 0 if AN is done.
 955                          * Otherwise, it's 0, and we're  still waiting for AN
 956                          */
 957                         if (err > 0) {
 958                                 err = phy_read_status(phydev);
 959                                 if (err)
 960                                         break;
 961
 962                                 if (phydev->link) {
 963                                         phydev->state = PHY_RUNNING;
 964                                         netif_carrier_on(phydev->attached_dev);
 965                                 } else  {
 966                                         phydev->state = PHY_NOLINK;
 967                                 }
 968                                 phydev->adjust_link(phydev->attached_dev);
 969                         } else {
 970                                 phydev->state = PHY_AN;
 971                                 phydev->link_timeout = PHY_AN_TIMEOUT;
 972                         }
 973                 } else {
 974                         err = phy_read_status(phydev);
 975                         if (err)
 976                                 break;
 977
 978                         if (phydev->link) {
 979                                 phydev->state = PHY_RUNNING;
 980                                 netif_carrier_on(phydev->attached_dev);
 981                         } else  {
 982                                 phydev->state = PHY_NOLINK;
 983                         }
 984                         phydev->adjust_link(phydev->attached_dev);
 985                 }
 986                 break;
 987         }
 988
 989         mutex_unlock(&phydev->lock);
 990
 991         if (needs_aneg)
 992                 err = phy_start_aneg(phydev);
 993         else if (do_suspend)
 994                 phy_suspend(phydev);
 995
 996         if (err < 0)
 997                 phy_error(phydev);
 998
 999         phydev_dbg(phydev, "PHY state change %s -> %s\n",
1000                    phy_state_to_str(old_state),
1001                    phy_state_to_str(phydev->state));
1002
1003         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1004                            PHY_STATE_TIME * HZ);
1005 }
1006
1007 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
1008 {
1009         cancel_work_sync(&phydev->phy_queue);
1010         phydev->link = new_link;
1011         schedule_work(&phydev->phy_queue);
1012 }
1013 EXPORT_SYMBOL(phy_mac_interrupt);
1014
1015 static inline void mmd_phy_indirect(struct mii_bus *bus, int prtad, int devad,
1016                                     int addr)
1017 {
1018         /* Write the desired MMD Devad */
1019         bus->write(bus, addr, MII_MMD_CTRL, devad);
1020
1021         /* Write the desired MMD register address */
1022         bus->write(bus, addr, MII_MMD_DATA, prtad);
1023
1024         /* Select the Function : DATA with no post increment */
1025         bus->write(bus, addr, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
1026 }
1027
1028 /**
1029  * phy_read_mmd_indirect - reads data from the MMD registers
1030  * @phydev: The PHY device bus
1031  * @prtad: MMD Address
1032  * @devad: MMD DEVAD
1033  *
1034  * Description: it reads data from the MMD registers (clause 22 to access to
1035  * clause 45) of the specified phy address.
1036  * To read these register we have:
1037  * 1) Write reg 13 // DEVAD
1038  * 2) Write reg 14 // MMD Address
1039  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1040  * 3) Read  reg 14 // Read MMD data
1041  */
1042 int phy_read_mmd_indirect(struct phy_device *phydev, int prtad, int devad)
1043 {
1044         struct phy_driver *phydrv = phydev->drv;
1045         int addr = phydev->mdio.addr;
1046         int value = -1;
1047
1048         if (!phydrv->read_mmd_indirect) {
1049                 struct mii_bus *bus = phydev->mdio.bus;
1050
1051                 mutex_lock(&bus->mdio_lock);
1052                 mmd_phy_indirect(bus, prtad, devad, addr);
1053
1054                 /* Read the content of the MMD's selected register */
1055                 value = bus->read(bus, addr, MII_MMD_DATA);
1056                 mutex_unlock(&bus->mdio_lock);
1057         } else {
1058                 value = phydrv->read_mmd_indirect(phydev, prtad, devad, addr);
1059         }
1060         return value;
1061 }
1062 EXPORT_SYMBOL(phy_read_mmd_indirect);
1063
1064 /**
1065  * phy_write_mmd_indirect - writes data to the MMD registers
1066  * @phydev: The PHY device
1067  * @prtad: MMD Address
1068  * @devad: MMD DEVAD
1069  * @data: data to write in the MMD register
1070  *
1071  * Description: Write data from the MMD registers of the specified
1072  * phy address.
1073  * To write these register we have:
1074  * 1) Write reg 13 // DEVAD
1075  * 2) Write reg 14 // MMD Address
1076  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1077  * 3) Write reg 14 // Write MMD data
1078  */
1079 void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
1080                                    int devad, u32 data)
1081 {
1082         struct phy_driver *phydrv = phydev->drv;
1083         int addr = phydev->mdio.addr;
1084
1085         if (!phydrv->write_mmd_indirect) {
1086                 struct mii_bus *bus = phydev->mdio.bus;
1087
1088                 mutex_lock(&bus->mdio_lock);
1089                 mmd_phy_indirect(bus, prtad, devad, addr);
1090
1091                 /* Write the data into MMD's selected register */
1092                 bus->write(bus, addr, MII_MMD_DATA, data);
1093                 mutex_unlock(&bus->mdio_lock);
1094         } else {
1095                 phydrv->write_mmd_indirect(phydev, prtad, devad, addr, data);
1096         }
1097 }
1098 EXPORT_SYMBOL(phy_write_mmd_indirect);
1099
1100 /**
1101  * phy_init_eee - init and check the EEE feature
1102  * @phydev: target phy_device struct
1103  * @clk_stop_enable: PHY may stop the clock during LPI
1104  *
1105  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1106  * is supported by looking at the MMD registers 3.20 and 7.60/61
1107  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1108  * bit if required.
1109  */
1110 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1111 {
1112         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1113          * Also EEE feature is active when core is operating with MII, GMII
1114          * or RGMII (all kinds). Internal PHYs are also allowed to proceed and
1115          * should return an error if they do not support EEE.
1116          */
1117         if ((phydev->duplex == DUPLEX_FULL) &&
1118             ((phydev->interface == PHY_INTERFACE_MODE_MII) ||
1119             (phydev->interface == PHY_INTERFACE_MODE_GMII) ||
1120              phy_interface_is_rgmii(phydev) ||
1121              phy_is_internal(phydev))) {
1122                 int eee_lp, eee_cap, eee_adv;
1123                 u32 lp, cap, adv;
1124                 int status;
1125
1126                 /* Read phy status to properly get the right settings */
1127                 status = phy_read_status(phydev);
1128                 if (status)
1129                         return status;
1130
1131                 /* First check if the EEE ability is supported */
1132                 eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1133                                                 MDIO_MMD_PCS);
1134                 if (eee_cap <= 0)
1135                         goto eee_exit_err;
1136
1137                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1138                 if (!cap)
1139                         goto eee_exit_err;
1140
1141                 /* Check which link settings negotiated and verify it in
1142                  * the EEE advertising registers.
1143                  */
1144                 eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1145                                                MDIO_MMD_AN);
1146                 if (eee_lp <= 0)
1147                         goto eee_exit_err;
1148
1149                 eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1150                                                 MDIO_MMD_AN);
1151                 if (eee_adv <= 0)
1152                         goto eee_exit_err;
1153
1154                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1155                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1156                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1157                         goto eee_exit_err;
1158
1159                 if (clk_stop_enable) {
1160                         /* Configure the PHY to stop receiving xMII
1161                          * clock while it is signaling LPI.
1162                          */
1163                         int val = phy_read_mmd_indirect(phydev, MDIO_CTRL1,
1164                                                         MDIO_MMD_PCS);
1165                         if (val < 0)
1166                                 return val;
1167
1168                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1169                         phy_write_mmd_indirect(phydev, MDIO_CTRL1,
1170                                                MDIO_MMD_PCS, val);
1171                 }
1172
1173                 return 0; /* EEE supported */
1174         }
1175 eee_exit_err:
1176         return -EPROTONOSUPPORT;
1177 }
1178 EXPORT_SYMBOL(phy_init_eee);
1179
1180 /**
1181  * phy_get_eee_err - report the EEE wake error count
1182  * @phydev: target phy_device struct
1183  *
1184  * Description: it is to report the number of time where the PHY
1185  * failed to complete its normal wake sequence.
1186  */
1187 int phy_get_eee_err(struct phy_device *phydev)
1188 {
1189         return phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_WK_ERR, MDIO_MMD_PCS);
1190 }
1191 EXPORT_SYMBOL(phy_get_eee_err);
1192
1193 /**
1194  * phy_ethtool_get_eee - get EEE supported and status
1195  * @phydev: target phy_device struct
1196  * @data: ethtool_eee data
1197  *
1198  * Description: it reportes the Supported/Advertisement/LP Advertisement
1199  * capabilities.
1200  */
1201 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1202 {
1203         int val;
1204
1205         /* Get Supported EEE */
1206         val = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE, MDIO_MMD_PCS);
1207         if (val < 0)
1208                 return val;
1209         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1210
1211         /* Get advertisement EEE */
1212         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN);
1213         if (val < 0)
1214                 return val;
1215         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1216
1217         /* Get LP advertisement EEE */
1218         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE, MDIO_MMD_AN);
1219         if (val < 0)
1220                 return val;
1221         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1222
1223         return 0;
1224 }
1225 EXPORT_SYMBOL(phy_ethtool_get_eee);
1226
1227 /**
1228  * phy_ethtool_set_eee - set EEE supported and status
1229  * @phydev: target phy_device struct
1230  * @data: ethtool_eee data
1231  *
1232  * Description: it is to program the Advertisement EEE register.
1233  */
1234 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1235 {
1236         int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
1237
1238         phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, val);
1239
1240         return 0;
1241 }
1242 EXPORT_SYMBOL(phy_ethtool_set_eee);
1243
1244 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1245 {
1246         if (phydev->drv->set_wol)
1247                 return phydev->drv->set_wol(phydev, wol);
1248
1249         return -EOPNOTSUPP;
1250 }
1251 EXPORT_SYMBOL(phy_ethtool_set_wol);
1252
1253 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1254 {
1255         if (phydev->drv->get_wol)
1256                 phydev->drv->get_wol(phydev, wol);
1257 }
1258 EXPORT_SYMBOL(phy_ethtool_get_wol);