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->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->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->addr;
 407                 /* fall through */
 408
 409         case SIOCGMIIREG:
 410                 mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id,
 411                                                  mii_data->reg_num);
 412                 return 0;
 413
 414         case SIOCSMIIREG:
 415                 if (mii_data->phy_id == phydev->addr) {
 416                         switch (mii_data->reg_num) {
 417                         case MII_BMCR:
 418                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 419                                         if (phydev->autoneg == AUTONEG_ENABLE)
 420                                                 change_autoneg = true;
 421                                         phydev->autoneg = AUTONEG_DISABLE;
 422                                         if (val & BMCR_FULLDPLX)
 423                                                 phydev->duplex = DUPLEX_FULL;
 424                                         else
 425                                                 phydev->duplex = DUPLEX_HALF;
 426                                         if (val & BMCR_SPEED1000)
 427                                                 phydev->speed = SPEED_1000;
 428                                         else if (val & BMCR_SPEED100)
 429                                                 phydev->speed = SPEED_100;
 430                                         else phydev->speed = SPEED_10;
 431                                 }
 432                                 else {
 433                                         if (phydev->autoneg == AUTONEG_DISABLE)
 434                                                 change_autoneg = true;
 435                                         phydev->autoneg = AUTONEG_ENABLE;
 436                                 }
 437                                 break;
 438                         case MII_ADVERTISE:
 439                                 phydev->advertising = mii_adv_to_ethtool_adv_t(val);
 440                                 change_autoneg = true;
 441                                 break;
 442                         default:
 443                                 /* do nothing */
 444                                 break;
 445                         }
 446                 }
 447
 448                 mdiobus_write(phydev->bus, mii_data->phy_id,
 449                               mii_data->reg_num, val);
 450
 451                 if (mii_data->reg_num == MII_BMCR &&
 452                     val & BMCR_RESET)
 453                         return phy_init_hw(phydev);
 454
 455                 if (change_autoneg)
 456                         return phy_start_aneg(phydev);
 457
 458                 return 0;
 459
 460         case SIOCSHWTSTAMP:
 461                 if (phydev->drv->hwtstamp)
 462                         return phydev->drv->hwtstamp(phydev, ifr);
 463                 /* fall through */
 464
 465         default:
 466                 return -EOPNOTSUPP;
 467         }
 468 }
 469 EXPORT_SYMBOL(phy_mii_ioctl);
 470
 471 /**
 472  * phy_start_aneg - start auto-negotiation for this PHY device
 473  * @phydev: the phy_device struct
 474  *
 475  * Description: Sanitizes the settings (if we're not autonegotiating
 476  *   them), and then calls the driver's config_aneg function.
 477  *   If the PHYCONTROL Layer is operating, we change the state to
 478  *   reflect the beginning of Auto-negotiation or forcing.
 479  */
 480 int phy_start_aneg(struct phy_device *phydev)
 481 {
 482         int err;
 483
 484         mutex_lock(&phydev->lock);
 485
 486         if (AUTONEG_DISABLE == phydev->autoneg)
 487                 phy_sanitize_settings(phydev);
 488
 489         /* Invalidate LP advertising flags */
 490         phydev->lp_advertising = 0;
 491
 492         err = phydev->drv->config_aneg(phydev);
 493         if (err < 0)
 494                 goto out_unlock;
 495
 496         if (phydev->state != PHY_HALTED) {
 497                 if (AUTONEG_ENABLE == phydev->autoneg) {
 498                         phydev->state = PHY_AN;
 499                         phydev->link_timeout = PHY_AN_TIMEOUT;
 500                 } else {
 501                         phydev->state = PHY_FORCING;
 502                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 503                 }
 504         }
 505
 506 out_unlock:
 507         mutex_unlock(&phydev->lock);
 508         return err;
 509 }
 510 EXPORT_SYMBOL(phy_start_aneg);
 511
 512 /**
 513  * phy_start_machine - start PHY state machine tracking
 514  * @phydev: the phy_device struct
 515  *
 516  * Description: The PHY infrastructure can run a state machine
 517  *   which tracks whether the PHY is starting up, negotiating,
 518  *   etc.  This function starts the timer which tracks the state
 519  *   of the PHY.  If you want to maintain your own state machine,
 520  *   do not call this function.
 521  */
 522 void phy_start_machine(struct phy_device *phydev)
 523 {
 524         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 525 }
 526
 527 /**
 528  * phy_stop_machine - stop the PHY state machine tracking
 529  * @phydev: target phy_device struct
 530  *
 531  * Description: Stops the state machine timer, sets the state to UP
 532  *   (unless it wasn't up yet). This function must be called BEFORE
 533  *   phy_detach.
 534  */
 535 void phy_stop_machine(struct phy_device *phydev)
 536 {
 537         cancel_delayed_work_sync(&phydev->state_queue);
 538
 539         mutex_lock(&phydev->lock);
 540         if (phydev->state > PHY_UP)
 541                 phydev->state = PHY_UP;
 542         mutex_unlock(&phydev->lock);
 543 }
 544
 545 /**
 546  * phy_error - enter HALTED state for this PHY device
 547  * @phydev: target phy_device struct
 548  *
 549  * Moves the PHY to the HALTED state in response to a read
 550  * or write error, and tells the controller the link is down.
 551  * Must not be called from interrupt context, or while the
 552  * phydev->lock is held.
 553  */
 554 static void phy_error(struct phy_device *phydev)
 555 {
 556         mutex_lock(&phydev->lock);
 557         phydev->state = PHY_HALTED;
 558         mutex_unlock(&phydev->lock);
 559 }
 560
 561 /**
 562  * phy_interrupt - PHY interrupt handler
 563  * @irq: interrupt line
 564  * @phy_dat: phy_device pointer
 565  *
 566  * Description: When a PHY interrupt occurs, the handler disables
 567  * interrupts, and schedules a work task to clear the interrupt.
 568  */
 569 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 570 {
 571         struct phy_device *phydev = phy_dat;
 572
 573         if (PHY_HALTED == phydev->state)
 574                 return IRQ_NONE;                /* It can't be ours.  */
 575
 576         /* The MDIO bus is not allowed to be written in interrupt
 577          * context, so we need to disable the irq here.  A work
 578          * queue will write the PHY to disable and clear the
 579          * interrupt, and then reenable the irq line.
 580          */
 581         disable_irq_nosync(irq);
 582         atomic_inc(&phydev->irq_disable);
 583
 584         queue_work(system_power_efficient_wq, &phydev->phy_queue);
 585
 586         return IRQ_HANDLED;
 587 }
 588
 589 /**
 590  * phy_enable_interrupts - Enable the interrupts from the PHY side
 591  * @phydev: target phy_device struct
 592  */
 593 static int phy_enable_interrupts(struct phy_device *phydev)
 594 {
 595         int err = phy_clear_interrupt(phydev);
 596
 597         if (err < 0)
 598                 return err;
 599
 600         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 601 }
 602
 603 /**
 604  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 605  * @phydev: target phy_device struct
 606  */
 607 static int phy_disable_interrupts(struct phy_device *phydev)
 608 {
 609         int err;
 610
 611         /* Disable PHY interrupts */
 612         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 613         if (err)
 614                 goto phy_err;
 615
 616         /* Clear the interrupt */
 617         err = phy_clear_interrupt(phydev);
 618         if (err)
 619                 goto phy_err;
 620
 621         return 0;
 622
 623 phy_err:
 624         phy_error(phydev);
 625
 626         return err;
 627 }
 628
 629 /**
 630  * phy_start_interrupts - request and enable interrupts for a PHY device
 631  * @phydev: target phy_device struct
 632  *
 633  * Description: Request the interrupt for the given PHY.
 634  *   If this fails, then we set irq to PHY_POLL.
 635  *   Otherwise, we enable the interrupts in the PHY.
 636  *   This should only be called with a valid IRQ number.
 637  *   Returns 0 on success or < 0 on error.
 638  */
 639 int phy_start_interrupts(struct phy_device *phydev)
 640 {
 641         atomic_set(&phydev->irq_disable, 0);
 642         if (request_irq(phydev->irq, phy_interrupt, 0, "phy_interrupt",
 643                         phydev) < 0) {
 644                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 645                         phydev->bus->name, phydev->irq);
 646                 phydev->irq = PHY_POLL;
 647                 return 0;
 648         }
 649
 650         return phy_enable_interrupts(phydev);
 651 }
 652 EXPORT_SYMBOL(phy_start_interrupts);
 653
 654 /**
 655  * phy_stop_interrupts - disable interrupts from a PHY device
 656  * @phydev: target phy_device struct
 657  */
 658 int phy_stop_interrupts(struct phy_device *phydev)
 659 {
 660         int err = phy_disable_interrupts(phydev);
 661
 662         if (err)
 663                 phy_error(phydev);
 664
 665         free_irq(phydev->irq, phydev);
 666
 667         /* Cannot call flush_scheduled_work() here as desired because
 668          * of rtnl_lock(), but we do not really care about what would
 669          * be done, except from enable_irq(), so cancel any work
 670          * possibly pending and take care of the matter below.
 671          */
 672         cancel_work_sync(&phydev->phy_queue);
 673         /* If work indeed has been cancelled, disable_irq() will have
 674          * been left unbalanced from phy_interrupt() and enable_irq()
 675          * has to be called so that other devices on the line work.
 676          */
 677         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 678                 enable_irq(phydev->irq);
 679
 680         return err;
 681 }
 682 EXPORT_SYMBOL(phy_stop_interrupts);
 683
 684 /**
 685  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 686  * @work: work_struct that describes the work to be done
 687  */
 688 void phy_change(struct work_struct *work)
 689 {
 690         struct phy_device *phydev =
 691                 container_of(work, struct phy_device, phy_queue);
 692
 693         if (phydev->drv->did_interrupt &&
 694             !phydev->drv->did_interrupt(phydev))
 695                 goto ignore;
 696
 697         if (phy_disable_interrupts(phydev))
 698                 goto phy_err;
 699
 700         mutex_lock(&phydev->lock);
 701         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 702                 phydev->state = PHY_CHANGELINK;
 703         mutex_unlock(&phydev->lock);
 704
 705         atomic_dec(&phydev->irq_disable);
 706         enable_irq(phydev->irq);
 707
 708         /* Reenable interrupts */
 709         if (PHY_HALTED != phydev->state &&
 710             phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 711                 goto irq_enable_err;
 712
 713         /* reschedule state queue work to run as soon as possible */
 714         cancel_delayed_work_sync(&phydev->state_queue);
 715         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 716         return;
 717
 718 ignore:
 719         atomic_dec(&phydev->irq_disable);
 720         enable_irq(phydev->irq);
 721         return;
 722
 723 irq_enable_err:
 724         disable_irq(phydev->irq);
 725         atomic_inc(&phydev->irq_disable);
 726 phy_err:
 727         phy_error(phydev);
 728 }
 729
 730 /**
 731  * phy_stop - Bring down the PHY link, and stop checking the status
 732  * @phydev: target phy_device struct
 733  */
 734 void phy_stop(struct phy_device *phydev)
 735 {
 736         mutex_lock(&phydev->lock);
 737
 738         if (PHY_HALTED == phydev->state)
 739                 goto out_unlock;
 740
 741         if (phy_interrupt_is_valid(phydev)) {
 742                 /* Disable PHY Interrupts */
 743                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 744
 745                 /* Clear any pending interrupts */
 746                 phy_clear_interrupt(phydev);
 747         }
 748
 749         phydev->state = PHY_HALTED;
 750
 751 out_unlock:
 752         mutex_unlock(&phydev->lock);
 753
 754         /* Cannot call flush_scheduled_work() here as desired because
 755          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 756          * will not reenable interrupts.
 757          */
 758 }
 759 EXPORT_SYMBOL(phy_stop);
 760
 761 /**
 762  * phy_start - start or restart a PHY device
 763  * @phydev: target phy_device struct
 764  *
 765  * Description: Indicates the attached device's readiness to
 766  *   handle PHY-related work.  Used during startup to start the
 767  *   PHY, and after a call to phy_stop() to resume operation.
 768  *   Also used to indicate the MDIO bus has cleared an error
 769  *   condition.
 770  */
 771 void phy_start(struct phy_device *phydev)
 772 {
 773         bool do_resume = false;
 774         int err = 0;
 775
 776         mutex_lock(&phydev->lock);
 777
 778         switch (phydev->state) {
 779         case PHY_STARTING:
 780                 phydev->state = PHY_PENDING;
 781                 break;
 782         case PHY_READY:
 783                 phydev->state = PHY_UP;
 784                 break;
 785         case PHY_HALTED:
 786                 /* make sure interrupts are re-enabled for the PHY */
 787                 err = phy_enable_interrupts(phydev);
 788                 if (err < 0)
 789                         break;
 790
 791                 phydev->state = PHY_RESUMING;
 792                 do_resume = true;
 793                 break;
 794         default:
 795                 break;
 796         }
 797         mutex_unlock(&phydev->lock);
 798
 799         /* if phy was suspended, bring the physical link up again */
 800         if (do_resume)
 801                 phy_resume(phydev);
 802 }
 803 EXPORT_SYMBOL(phy_start);
 804
 805 /**
 806  * phy_state_machine - Handle the state machine
 807  * @work: work_struct that describes the work to be done
 808  */
 809 void phy_state_machine(struct work_struct *work)
 810 {
 811         struct delayed_work *dwork = to_delayed_work(work);
 812         struct phy_device *phydev =
 813                         container_of(dwork, struct phy_device, state_queue);
 814         bool needs_aneg = false, do_suspend = false;
 815         enum phy_state old_state;
 816         int err = 0;
 817         int old_link;
 818
 819         mutex_lock(&phydev->lock);
 820
 821         old_state = phydev->state;
 822
 823         if (phydev->drv->link_change_notify)
 824                 phydev->drv->link_change_notify(phydev);
 825
 826         switch (phydev->state) {
 827         case PHY_DOWN:
 828         case PHY_STARTING:
 829         case PHY_READY:
 830         case PHY_PENDING:
 831                 break;
 832         case PHY_UP:
 833                 needs_aneg = true;
 834
 835                 phydev->link_timeout = PHY_AN_TIMEOUT;
 836
 837                 break;
 838         case PHY_AN:
 839                 err = phy_read_status(phydev);
 840                 if (err < 0)
 841                         break;
 842
 843                 /* If the link is down, give up on negotiation for now */
 844                 if (!phydev->link) {
 845                         phydev->state = PHY_NOLINK;
 846                         netif_carrier_off(phydev->attached_dev);
 847                         phydev->adjust_link(phydev->attached_dev);
 848                         break;
 849                 }
 850
 851                 /* Check if negotiation is done.  Break if there's an error */
 852                 err = phy_aneg_done(phydev);
 853                 if (err < 0)
 854                         break;
 855
 856                 /* If AN is done, we're running */
 857                 if (err > 0) {
 858                         phydev->state = PHY_RUNNING;
 859                         netif_carrier_on(phydev->attached_dev);
 860                         phydev->adjust_link(phydev->attached_dev);
 861
 862                 } else if (0 == phydev->link_timeout--)
 863                         needs_aneg = true;
 864                 break;
 865         case PHY_NOLINK:
 866                 if (phy_interrupt_is_valid(phydev))
 867                         break;
 868
 869                 err = phy_read_status(phydev);
 870                 if (err)
 871                         break;
 872
 873                 if (phydev->link) {
 874                         if (AUTONEG_ENABLE == phydev->autoneg) {
 875                                 err = phy_aneg_done(phydev);
 876                                 if (err < 0)
 877                                         break;
 878
 879                                 if (!err) {
 880                                         phydev->state = PHY_AN;
 881                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 882                                         break;
 883                                 }
 884                         }
 885                         phydev->state = PHY_RUNNING;
 886                         netif_carrier_on(phydev->attached_dev);
 887                         phydev->adjust_link(phydev->attached_dev);
 888                 }
 889                 break;
 890         case PHY_FORCING:
 891                 err = genphy_update_link(phydev);
 892                 if (err)
 893                         break;
 894
 895                 if (phydev->link) {
 896                         phydev->state = PHY_RUNNING;
 897                         netif_carrier_on(phydev->attached_dev);
 898                 } else {
 899                         if (0 == phydev->link_timeout--)
 900                                 needs_aneg = true;
 901                 }
 902
 903                 phydev->adjust_link(phydev->attached_dev);
 904                 break;
 905         case PHY_RUNNING:
 906                 /* Only register a CHANGE if we are polling or ignoring
 907                  * interrupts and link changed since latest checking.
 908                  */
 909                 if (!phy_interrupt_is_valid(phydev)) {
 910                         old_link = phydev->link;
 911                         err = phy_read_status(phydev);
 912                         if (err)
 913                                 break;
 914
 915                         if (old_link != phydev->link)
 916                                 phydev->state = PHY_CHANGELINK;
 917                 }
 918                 break;
 919         case PHY_CHANGELINK:
 920                 err = phy_read_status(phydev);
 921                 if (err)
 922                         break;
 923
 924                 if (phydev->link) {
 925                         phydev->state = PHY_RUNNING;
 926                         netif_carrier_on(phydev->attached_dev);
 927                 } else {
 928                         phydev->state = PHY_NOLINK;
 929                         netif_carrier_off(phydev->attached_dev);
 930                 }
 931
 932                 phydev->adjust_link(phydev->attached_dev);
 933
 934                 if (phy_interrupt_is_valid(phydev))
 935                         err = phy_config_interrupt(phydev,
 936                                                    PHY_INTERRUPT_ENABLED);
 937                 break;
 938         case PHY_HALTED:
 939                 if (phydev->link) {
 940                         phydev->link = 0;
 941                         netif_carrier_off(phydev->attached_dev);
 942                         phydev->adjust_link(phydev->attached_dev);
 943                         do_suspend = true;
 944                 }
 945                 break;
 946         case PHY_RESUMING:
 947                 if (AUTONEG_ENABLE == phydev->autoneg) {
 948                         err = phy_aneg_done(phydev);
 949                         if (err < 0)
 950                                 break;
 951
 952                         /* err > 0 if AN is done.
 953                          * Otherwise, it's 0, and we're  still waiting for AN
 954                          */
 955                         if (err > 0) {
 956                                 err = phy_read_status(phydev);
 957                                 if (err)
 958                                         break;
 959
 960                                 if (phydev->link) {
 961                                         phydev->state = PHY_RUNNING;
 962                                         netif_carrier_on(phydev->attached_dev);
 963                                 } else  {
 964                                         phydev->state = PHY_NOLINK;
 965                                 }
 966                                 phydev->adjust_link(phydev->attached_dev);
 967                         } else {
 968                                 phydev->state = PHY_AN;
 969                                 phydev->link_timeout = PHY_AN_TIMEOUT;
 970                         }
 971                 } else {
 972                         err = phy_read_status(phydev);
 973                         if (err)
 974                                 break;
 975
 976                         if (phydev->link) {
 977                                 phydev->state = PHY_RUNNING;
 978                                 netif_carrier_on(phydev->attached_dev);
 979                         } else  {
 980                                 phydev->state = PHY_NOLINK;
 981                         }
 982                         phydev->adjust_link(phydev->attached_dev);
 983                 }
 984                 break;
 985         }
 986
 987         mutex_unlock(&phydev->lock);
 988
 989         if (needs_aneg)
 990                 err = phy_start_aneg(phydev);
 991         else if (do_suspend)
 992                 phy_suspend(phydev);
 993
 994         if (err < 0)
 995                 phy_error(phydev);
 996
 997         dev_dbg(&phydev->dev, "PHY state change %s -> %s\n",
 998                 phy_state_to_str(old_state), phy_state_to_str(phydev->state));
 999
1000         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
1001                            PHY_STATE_TIME * HZ);
1002 }
1003
1004 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
1005 {
1006         cancel_work_sync(&phydev->phy_queue);
1007         phydev->link = new_link;
1008         schedule_work(&phydev->phy_queue);
1009 }
1010 EXPORT_SYMBOL(phy_mac_interrupt);
1011
1012 static inline void mmd_phy_indirect(struct mii_bus *bus, int prtad, int devad,
1013                                     int addr)
1014 {
1015         /* Write the desired MMD Devad */
1016         bus->write(bus, addr, MII_MMD_CTRL, devad);
1017
1018         /* Write the desired MMD register address */
1019         bus->write(bus, addr, MII_MMD_DATA, prtad);
1020
1021         /* Select the Function : DATA with no post increment */
1022         bus->write(bus, addr, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
1023 }
1024
1025 /**
1026  * phy_read_mmd_indirect - reads data from the MMD registers
1027  * @phydev: The PHY device bus
1028  * @prtad: MMD Address
1029  * @devad: MMD DEVAD
1030  * @addr: PHY address on the MII bus
1031  *
1032  * Description: it reads data from the MMD registers (clause 22 to access to
1033  * clause 45) of the specified phy address.
1034  * To read these register we have:
1035  * 1) Write reg 13 // DEVAD
1036  * 2) Write reg 14 // MMD Address
1037  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1038  * 3) Read  reg 14 // Read MMD data
1039  */
1040 int phy_read_mmd_indirect(struct phy_device *phydev, int prtad,
1041                                  int devad, int addr)
1042 {
1043         struct phy_driver *phydrv = phydev->drv;
1044         int value = -1;
1045
1046         if (!phydrv->read_mmd_indirect) {
1047                 struct mii_bus *bus = phydev->bus;
1048
1049                 mutex_lock(&bus->mdio_lock);
1050                 mmd_phy_indirect(bus, prtad, devad, addr);
1051
1052                 /* Read the content of the MMD's selected register */
1053                 value = bus->read(bus, addr, MII_MMD_DATA);
1054                 mutex_unlock(&bus->mdio_lock);
1055         } else {
1056                 value = phydrv->read_mmd_indirect(phydev, prtad, devad, addr);
1057         }
1058         return value;
1059 }
1060 EXPORT_SYMBOL(phy_read_mmd_indirect);
1061
1062 /**
1063  * phy_write_mmd_indirect - writes data to the MMD registers
1064  * @phydev: The PHY device
1065  * @prtad: MMD Address
1066  * @devad: MMD DEVAD
1067  * @addr: PHY address on the MII bus
1068  * @data: data to write in the MMD register
1069  *
1070  * Description: Write data from the MMD registers of the specified
1071  * phy address.
1072  * To write these register we have:
1073  * 1) Write reg 13 // DEVAD
1074  * 2) Write reg 14 // MMD Address
1075  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
1076  * 3) Write reg 14 // Write MMD data
1077  */
1078 void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
1079                                    int devad, int addr, u32 data)
1080 {
1081         struct phy_driver *phydrv = phydev->drv;
1082
1083         if (!phydrv->write_mmd_indirect) {
1084                 struct mii_bus *bus = phydev->bus;
1085
1086                 mutex_lock(&bus->mdio_lock);
1087                 mmd_phy_indirect(bus, prtad, devad, addr);
1088
1089                 /* Write the data into MMD's selected register */
1090                 bus->write(bus, addr, MII_MMD_DATA, data);
1091                 mutex_unlock(&bus->mdio_lock);
1092         } else {
1093                 phydrv->write_mmd_indirect(phydev, prtad, devad, addr, data);
1094         }
1095 }
1096 EXPORT_SYMBOL(phy_write_mmd_indirect);
1097
1098 /**
1099  * phy_init_eee - init and check the EEE feature
1100  * @phydev: target phy_device struct
1101  * @clk_stop_enable: PHY may stop the clock during LPI
1102  *
1103  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1104  * is supported by looking at the MMD registers 3.20 and 7.60/61
1105  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1106  * bit if required.
1107  */
1108 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1109 {
1110         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1111          * Also EEE feature is active when core is operating with MII, GMII
1112          * or RGMII (all kinds). Internal PHYs are also allowed to proceed and
1113          * should return an error if they do not support EEE.
1114          */
1115         if ((phydev->duplex == DUPLEX_FULL) &&
1116             ((phydev->interface == PHY_INTERFACE_MODE_MII) ||
1117             (phydev->interface == PHY_INTERFACE_MODE_GMII) ||
1118              phy_interface_is_rgmii(phydev) ||
1119              phy_is_internal(phydev))) {
1120                 int eee_lp, eee_cap, eee_adv;
1121                 u32 lp, cap, adv;
1122                 int status;
1123
1124                 /* Read phy status to properly get the right settings */
1125                 status = phy_read_status(phydev);
1126                 if (status)
1127                         return status;
1128
1129                 /* First check if the EEE ability is supported */
1130                 eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1131                                                 MDIO_MMD_PCS, phydev->addr);
1132                 if (eee_cap <= 0)
1133                         goto eee_exit_err;
1134
1135                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1136                 if (!cap)
1137                         goto eee_exit_err;
1138
1139                 /* Check which link settings negotiated and verify it in
1140                  * the EEE advertising registers.
1141                  */
1142                 eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1143                                                MDIO_MMD_AN, phydev->addr);
1144                 if (eee_lp <= 0)
1145                         goto eee_exit_err;
1146
1147                 eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1148                                                 MDIO_MMD_AN, phydev->addr);
1149                 if (eee_adv <= 0)
1150                         goto eee_exit_err;
1151
1152                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1153                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1154                 if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv))
1155                         goto eee_exit_err;
1156
1157                 if (clk_stop_enable) {
1158                         /* Configure the PHY to stop receiving xMII
1159                          * clock while it is signaling LPI.
1160                          */
1161                         int val = phy_read_mmd_indirect(phydev, MDIO_CTRL1,
1162                                                         MDIO_MMD_PCS,
1163                                                         phydev->addr);
1164                         if (val < 0)
1165                                 return val;
1166
1167                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1168                         phy_write_mmd_indirect(phydev, MDIO_CTRL1,
1169                                                MDIO_MMD_PCS, phydev->addr,
1170                                                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,
1190                                      MDIO_MMD_PCS, phydev->addr);
1191 }
1192 EXPORT_SYMBOL(phy_get_eee_err);
1193
1194 /**
1195  * phy_ethtool_get_eee - get EEE supported and status
1196  * @phydev: target phy_device struct
1197  * @data: ethtool_eee data
1198  *
1199  * Description: it reportes the Supported/Advertisement/LP Advertisement
1200  * capabilities.
1201  */
1202 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1203 {
1204         int val;
1205
1206         /* Get Supported EEE */
1207         val = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1208                                     MDIO_MMD_PCS, phydev->addr);
1209         if (val < 0)
1210                 return val;
1211         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1212
1213         /* Get advertisement EEE */
1214         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1215                                     MDIO_MMD_AN, phydev->addr);
1216         if (val < 0)
1217                 return val;
1218         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1219
1220         /* Get LP advertisement EEE */
1221         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1222                                     MDIO_MMD_AN, phydev->addr);
1223         if (val < 0)
1224                 return val;
1225         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1226
1227         return 0;
1228 }
1229 EXPORT_SYMBOL(phy_ethtool_get_eee);
1230
1231 /**
1232  * phy_ethtool_set_eee - set EEE supported and status
1233  * @phydev: target phy_device struct
1234  * @data: ethtool_eee data
1235  *
1236  * Description: it is to program the Advertisement EEE register.
1237  */
1238 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1239 {
1240         int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
1241
1242         phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN,
1243                                phydev->addr, val);
1244
1245         return 0;
1246 }
1247 EXPORT_SYMBOL(phy_ethtool_set_eee);
1248
1249 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1250 {
1251         if (phydev->drv->set_wol)
1252                 return phydev->drv->set_wol(phydev, wol);
1253
1254         return -EOPNOTSUPP;
1255 }
1256 EXPORT_SYMBOL(phy_ethtool_set_wol);
1257
1258 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1259 {
1260         if (phydev->drv->get_wol)
1261                 phydev->drv->get_wol(phydev, wol);
1262 }
1263 EXPORT_SYMBOL(phy_ethtool_get_wol);