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 /**
  62  * phy_print_status - Convenience function to print out the current phy status
  63  * @phydev: the phy_device struct
  64  */
  65 void phy_print_status(struct phy_device *phydev)
  66 {
  67         if (phydev->link) {
  68                 netdev_info(phydev->attached_dev,
  69                         "Link is Up - %s/%s - flow control %s\n",
  70                         phy_speed_to_str(phydev->speed),
  71                         DUPLEX_FULL == phydev->duplex ? "Full" : "Half",
  72                         phydev->pause ? "rx/tx" : "off");
  73         } else  {
  74                 netdev_info(phydev->attached_dev, "Link is Down\n");
  75         }
  76 }
  77 EXPORT_SYMBOL(phy_print_status);
  78
  79 /**
  80  * phy_clear_interrupt - Ack the phy device's interrupt
  81  * @phydev: the phy_device struct
  82  *
  83  * If the @phydev driver has an ack_interrupt function, call it to
  84  * ack and clear the phy device's interrupt.
  85  *
  86  * Returns 0 on success or < 0 on error.
  87  */
  88 static int phy_clear_interrupt(struct phy_device *phydev)
  89 {
  90         if (phydev->drv->ack_interrupt)
  91                 return phydev->drv->ack_interrupt(phydev);
  92
  93         return 0;
  94 }
  95
  96 /**
  97  * phy_config_interrupt - configure the PHY device for the requested interrupts
  98  * @phydev: the phy_device struct
  99  * @interrupts: interrupt flags to configure for this @phydev
 100  *
 101  * Returns 0 on success or < 0 on error.
 102  */
 103 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 104 {
 105         phydev->interrupts = interrupts;
 106         if (phydev->drv->config_intr)
 107                 return phydev->drv->config_intr(phydev);
 108
 109         return 0;
 110 }
 111
 112
 113 /**
 114  * phy_aneg_done - return auto-negotiation status
 115  * @phydev: target phy_device struct
 116  *
 117  * Description: Return the auto-negotiation status from this @phydev
 118  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 119  * is still pending.
 120  */
 121 static inline int phy_aneg_done(struct phy_device *phydev)
 122 {
 123         if (phydev->drv->aneg_done)
 124                 return phydev->drv->aneg_done(phydev);
 125
 126         return genphy_aneg_done(phydev);
 127 }
 128
 129 /* A structure for mapping a particular speed and duplex
 130  * combination to a particular SUPPORTED and ADVERTISED value
 131  */
 132 struct phy_setting {
 133         int speed;
 134         int duplex;
 135         u32 setting;
 136 };
 137
 138 /* A mapping of all SUPPORTED settings to speed/duplex */
 139 static const struct phy_setting settings[] = {
 140         {
 141                 .speed = SPEED_10000,
 142                 .duplex = DUPLEX_FULL,
 143                 .setting = SUPPORTED_10000baseKR_Full,
 144         },
 145         {
 146                 .speed = SPEED_10000,
 147                 .duplex = DUPLEX_FULL,
 148                 .setting = SUPPORTED_10000baseKX4_Full,
 149         },
 150         {
 151                 .speed = SPEED_10000,
 152                 .duplex = DUPLEX_FULL,
 153                 .setting = SUPPORTED_10000baseT_Full,
 154         },
 155         {
 156                 .speed = SPEED_2500,
 157                 .duplex = DUPLEX_FULL,
 158                 .setting = SUPPORTED_2500baseX_Full,
 159         },
 160         {
 161                 .speed = SPEED_1000,
 162                 .duplex = DUPLEX_FULL,
 163                 .setting = SUPPORTED_1000baseKX_Full,
 164         },
 165         {
 166                 .speed = SPEED_1000,
 167                 .duplex = DUPLEX_FULL,
 168                 .setting = SUPPORTED_1000baseT_Full,
 169         },
 170         {
 171                 .speed = SPEED_1000,
 172                 .duplex = DUPLEX_HALF,
 173                 .setting = SUPPORTED_1000baseT_Half,
 174         },
 175         {
 176                 .speed = SPEED_100,
 177                 .duplex = DUPLEX_FULL,
 178                 .setting = SUPPORTED_100baseT_Full,
 179         },
 180         {
 181                 .speed = SPEED_100,
 182                 .duplex = DUPLEX_HALF,
 183                 .setting = SUPPORTED_100baseT_Half,
 184         },
 185         {
 186                 .speed = SPEED_10,
 187                 .duplex = DUPLEX_FULL,
 188                 .setting = SUPPORTED_10baseT_Full,
 189         },
 190         {
 191                 .speed = SPEED_10,
 192                 .duplex = DUPLEX_HALF,
 193                 .setting = SUPPORTED_10baseT_Half,
 194         },
 195 };
 196
 197 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 198
 199 /**
 200  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 201  * @speed: speed to match
 202  * @duplex: duplex to match
 203  *
 204  * Description: Searches the settings array for the setting which
 205  *   matches the desired speed and duplex, and returns the index
 206  *   of that setting.  Returns the index of the last setting if
 207  *   none of the others match.
 208  */
 209 static inline unsigned int phy_find_setting(int speed, int duplex)
 210 {
 211         unsigned int idx = 0;
 212
 213         while (idx < ARRAY_SIZE(settings) &&
 214                (settings[idx].speed != speed || settings[idx].duplex != duplex))
 215                 idx++;
 216
 217         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 218 }
 219
 220 /**
 221  * phy_find_valid - find a PHY setting that matches the requested features mask
 222  * @idx: The first index in settings[] to search
 223  * @features: A mask of the valid settings
 224  *
 225  * Description: Returns the index of the first valid setting less
 226  *   than or equal to the one pointed to by idx, as determined by
 227  *   the mask in features.  Returns the index of the last setting
 228  *   if nothing else matches.
 229  */
 230 static inline unsigned int phy_find_valid(unsigned int idx, u32 features)
 231 {
 232         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 233                 idx++;
 234
 235         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 236 }
 237
 238 /**
 239  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 240  * @phydev: the target phy_device struct
 241  *
 242  * Description: Make sure the PHY is set to supported speeds and
 243  *   duplexes.  Drop down by one in this order:  1000/FULL,
 244  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 245  */
 246 static void phy_sanitize_settings(struct phy_device *phydev)
 247 {
 248         u32 features = phydev->supported;
 249         unsigned int idx;
 250
 251         /* Sanitize settings based on PHY capabilities */
 252         if ((features & SUPPORTED_Autoneg) == 0)
 253                 phydev->autoneg = AUTONEG_DISABLE;
 254
 255         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 256                         features);
 257
 258         phydev->speed = settings[idx].speed;
 259         phydev->duplex = settings[idx].duplex;
 260 }
 261
 262 /**
 263  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 264  * @phydev: target phy_device struct
 265  * @cmd: ethtool_cmd
 266  *
 267  * A few notes about parameter checking:
 268  * - We don't set port or transceiver, so we don't care what they
 269  *   were set to.
 270  * - phy_start_aneg() will make sure forced settings are sane, and
 271  *   choose the next best ones from the ones selected, so we don't
 272  *   care if ethtool tries to give us bad values.
 273  */
 274 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 275 {
 276         u32 speed = ethtool_cmd_speed(cmd);
 277
 278         if (cmd->phy_address != phydev->addr)
 279                 return -EINVAL;
 280
 281         /* We make sure that we don't pass unsupported values in to the PHY */
 282         cmd->advertising &= phydev->supported;
 283
 284         /* Verify the settings we care about. */
 285         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 286                 return -EINVAL;
 287
 288         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 289                 return -EINVAL;
 290
 291         if (cmd->autoneg == AUTONEG_DISABLE &&
 292             ((speed != SPEED_1000 &&
 293               speed != SPEED_100 &&
 294               speed != SPEED_10) ||
 295              (cmd->duplex != DUPLEX_HALF &&
 296               cmd->duplex != DUPLEX_FULL)))
 297                 return -EINVAL;
 298
 299         phydev->autoneg = cmd->autoneg;
 300
 301         phydev->speed = speed;
 302
 303         phydev->advertising = cmd->advertising;
 304
 305         if (AUTONEG_ENABLE == cmd->autoneg)
 306                 phydev->advertising |= ADVERTISED_Autoneg;
 307         else
 308                 phydev->advertising &= ~ADVERTISED_Autoneg;
 309
 310         phydev->duplex = cmd->duplex;
 311
 312         /* Restart the PHY */
 313         phy_start_aneg(phydev);
 314
 315         return 0;
 316 }
 317 EXPORT_SYMBOL(phy_ethtool_sset);
 318
 319 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 320 {
 321         cmd->supported = phydev->supported;
 322
 323         cmd->advertising = phydev->advertising;
 324         cmd->lp_advertising = phydev->lp_advertising;
 325
 326         ethtool_cmd_speed_set(cmd, phydev->speed);
 327         cmd->duplex = phydev->duplex;
 328         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 329                 cmd->port = PORT_BNC;
 330         else
 331                 cmd->port = PORT_MII;
 332         cmd->phy_address = phydev->addr;
 333         cmd->transceiver = phy_is_internal(phydev) ?
 334                 XCVR_INTERNAL : XCVR_EXTERNAL;
 335         cmd->autoneg = phydev->autoneg;
 336
 337         return 0;
 338 }
 339 EXPORT_SYMBOL(phy_ethtool_gset);
 340
 341 /**
 342  * phy_mii_ioctl - generic PHY MII ioctl interface
 343  * @phydev: the phy_device struct
 344  * @ifr: &struct ifreq for socket ioctl's
 345  * @cmd: ioctl cmd to execute
 346  *
 347  * Note that this function is currently incompatible with the
 348  * PHYCONTROL layer.  It changes registers without regard to
 349  * current state.  Use at own risk.
 350  */
 351 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 352 {
 353         struct mii_ioctl_data *mii_data = if_mii(ifr);
 354         u16 val = mii_data->val_in;
 355
 356         switch (cmd) {
 357         case SIOCGMIIPHY:
 358                 mii_data->phy_id = phydev->addr;
 359                 /* fall through */
 360
 361         case SIOCGMIIREG:
 362                 mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id,
 363                                                  mii_data->reg_num);
 364                 return 0;
 365
 366         case SIOCSMIIREG:
 367                 if (mii_data->phy_id == phydev->addr) {
 368                         switch (mii_data->reg_num) {
 369                         case MII_BMCR:
 370                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0)
 371                                         phydev->autoneg = AUTONEG_DISABLE;
 372                                 else
 373                                         phydev->autoneg = AUTONEG_ENABLE;
 374                                 if (!phydev->autoneg && (val & BMCR_FULLDPLX))
 375                                         phydev->duplex = DUPLEX_FULL;
 376                                 else
 377                                         phydev->duplex = DUPLEX_HALF;
 378                                 if (!phydev->autoneg && (val & BMCR_SPEED1000))
 379                                         phydev->speed = SPEED_1000;
 380                                 else if (!phydev->autoneg &&
 381                                          (val & BMCR_SPEED100))
 382                                         phydev->speed = SPEED_100;
 383                                 break;
 384                         case MII_ADVERTISE:
 385                                 phydev->advertising = val;
 386                                 break;
 387                         default:
 388                                 /* do nothing */
 389                                 break;
 390                         }
 391                 }
 392
 393                 mdiobus_write(phydev->bus, mii_data->phy_id,
 394                               mii_data->reg_num, val);
 395
 396                 if (mii_data->reg_num == MII_BMCR &&
 397                     val & BMCR_RESET)
 398                         return phy_init_hw(phydev);
 399                 return 0;
 400
 401         case SIOCSHWTSTAMP:
 402                 if (phydev->drv->hwtstamp)
 403                         return phydev->drv->hwtstamp(phydev, ifr);
 404                 /* fall through */
 405
 406         default:
 407                 return -EOPNOTSUPP;
 408         }
 409 }
 410 EXPORT_SYMBOL(phy_mii_ioctl);
 411
 412 /**
 413  * phy_start_aneg - start auto-negotiation for this PHY device
 414  * @phydev: the phy_device struct
 415  *
 416  * Description: Sanitizes the settings (if we're not autonegotiating
 417  *   them), and then calls the driver's config_aneg function.
 418  *   If the PHYCONTROL Layer is operating, we change the state to
 419  *   reflect the beginning of Auto-negotiation or forcing.
 420  */
 421 int phy_start_aneg(struct phy_device *phydev)
 422 {
 423         int err;
 424
 425         mutex_lock(&phydev->lock);
 426
 427         if (AUTONEG_DISABLE == phydev->autoneg)
 428                 phy_sanitize_settings(phydev);
 429
 430         err = phydev->drv->config_aneg(phydev);
 431         if (err < 0)
 432                 goto out_unlock;
 433
 434         if (phydev->state != PHY_HALTED) {
 435                 if (AUTONEG_ENABLE == phydev->autoneg) {
 436                         phydev->state = PHY_AN;
 437                         phydev->link_timeout = PHY_AN_TIMEOUT;
 438                 } else {
 439                         phydev->state = PHY_FORCING;
 440                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 441                 }
 442         }
 443
 444 out_unlock:
 445         mutex_unlock(&phydev->lock);
 446         return err;
 447 }
 448 EXPORT_SYMBOL(phy_start_aneg);
 449
 450 /**
 451  * phy_start_machine - start PHY state machine tracking
 452  * @phydev: the phy_device struct
 453  *
 454  * Description: The PHY infrastructure can run a state machine
 455  *   which tracks whether the PHY is starting up, negotiating,
 456  *   etc.  This function starts the timer which tracks the state
 457  *   of the PHY.  If you want to maintain your own state machine,
 458  *   do not call this function.
 459  */
 460 void phy_start_machine(struct phy_device *phydev)
 461 {
 462         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);
 463 }
 464
 465 /**
 466  * phy_stop_machine - stop the PHY state machine tracking
 467  * @phydev: target phy_device struct
 468  *
 469  * Description: Stops the state machine timer, sets the state to UP
 470  *   (unless it wasn't up yet). This function must be called BEFORE
 471  *   phy_detach.
 472  */
 473 void phy_stop_machine(struct phy_device *phydev)
 474 {
 475         cancel_delayed_work_sync(&phydev->state_queue);
 476
 477         mutex_lock(&phydev->lock);
 478         if (phydev->state > PHY_UP)
 479                 phydev->state = PHY_UP;
 480         mutex_unlock(&phydev->lock);
 481 }
 482
 483 /**
 484  * phy_error - enter HALTED state for this PHY device
 485  * @phydev: target phy_device struct
 486  *
 487  * Moves the PHY to the HALTED state in response to a read
 488  * or write error, and tells the controller the link is down.
 489  * Must not be called from interrupt context, or while the
 490  * phydev->lock is held.
 491  */
 492 static void phy_error(struct phy_device *phydev)
 493 {
 494         mutex_lock(&phydev->lock);
 495         phydev->state = PHY_HALTED;
 496         mutex_unlock(&phydev->lock);
 497 }
 498
 499 /**
 500  * phy_interrupt - PHY interrupt handler
 501  * @irq: interrupt line
 502  * @phy_dat: phy_device pointer
 503  *
 504  * Description: When a PHY interrupt occurs, the handler disables
 505  * interrupts, and schedules a work task to clear the interrupt.
 506  */
 507 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 508 {
 509         struct phy_device *phydev = phy_dat;
 510
 511         if (PHY_HALTED == phydev->state)
 512                 return IRQ_NONE;                /* It can't be ours.  */
 513
 514         /* The MDIO bus is not allowed to be written in interrupt
 515          * context, so we need to disable the irq here.  A work
 516          * queue will write the PHY to disable and clear the
 517          * interrupt, and then reenable the irq line.
 518          */
 519         disable_irq_nosync(irq);
 520         atomic_inc(&phydev->irq_disable);
 521
 522         queue_work(system_power_efficient_wq, &phydev->phy_queue);
 523
 524         return IRQ_HANDLED;
 525 }
 526
 527 /**
 528  * phy_enable_interrupts - Enable the interrupts from the PHY side
 529  * @phydev: target phy_device struct
 530  */
 531 static int phy_enable_interrupts(struct phy_device *phydev)
 532 {
 533         int err = phy_clear_interrupt(phydev);
 534
 535         if (err < 0)
 536                 return err;
 537
 538         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 539 }
 540
 541 /**
 542  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 543  * @phydev: target phy_device struct
 544  */
 545 static int phy_disable_interrupts(struct phy_device *phydev)
 546 {
 547         int err;
 548
 549         /* Disable PHY interrupts */
 550         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 551         if (err)
 552                 goto phy_err;
 553
 554         /* Clear the interrupt */
 555         err = phy_clear_interrupt(phydev);
 556         if (err)
 557                 goto phy_err;
 558
 559         return 0;
 560
 561 phy_err:
 562         phy_error(phydev);
 563
 564         return err;
 565 }
 566
 567 /**
 568  * phy_start_interrupts - request and enable interrupts for a PHY device
 569  * @phydev: target phy_device struct
 570  *
 571  * Description: Request the interrupt for the given PHY.
 572  *   If this fails, then we set irq to PHY_POLL.
 573  *   Otherwise, we enable the interrupts in the PHY.
 574  *   This should only be called with a valid IRQ number.
 575  *   Returns 0 on success or < 0 on error.
 576  */
 577 int phy_start_interrupts(struct phy_device *phydev)
 578 {
 579         atomic_set(&phydev->irq_disable, 0);
 580         if (request_irq(phydev->irq, phy_interrupt, 0, "phy_interrupt",
 581                         phydev) < 0) {
 582                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 583                         phydev->bus->name, phydev->irq);
 584                 phydev->irq = PHY_POLL;
 585                 return 0;
 586         }
 587
 588         return phy_enable_interrupts(phydev);
 589 }
 590 EXPORT_SYMBOL(phy_start_interrupts);
 591
 592 /**
 593  * phy_stop_interrupts - disable interrupts from a PHY device
 594  * @phydev: target phy_device struct
 595  */
 596 int phy_stop_interrupts(struct phy_device *phydev)
 597 {
 598         int err = phy_disable_interrupts(phydev);
 599
 600         if (err)
 601                 phy_error(phydev);
 602
 603         free_irq(phydev->irq, phydev);
 604
 605         /* Cannot call flush_scheduled_work() here as desired because
 606          * of rtnl_lock(), but we do not really care about what would
 607          * be done, except from enable_irq(), so cancel any work
 608          * possibly pending and take care of the matter below.
 609          */
 610         cancel_work_sync(&phydev->phy_queue);
 611         /* If work indeed has been cancelled, disable_irq() will have
 612          * been left unbalanced from phy_interrupt() and enable_irq()
 613          * has to be called so that other devices on the line work.
 614          */
 615         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 616                 enable_irq(phydev->irq);
 617
 618         return err;
 619 }
 620 EXPORT_SYMBOL(phy_stop_interrupts);
 621
 622 /**
 623  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 624  * @work: work_struct that describes the work to be done
 625  */
 626 void phy_change(struct work_struct *work)
 627 {
 628         struct phy_device *phydev =
 629                 container_of(work, struct phy_device, phy_queue);
 630
 631         if (phydev->drv->did_interrupt &&
 632             !phydev->drv->did_interrupt(phydev))
 633                 goto ignore;
 634
 635         if (phy_disable_interrupts(phydev))
 636                 goto phy_err;
 637
 638         mutex_lock(&phydev->lock);
 639         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 640                 phydev->state = PHY_CHANGELINK;
 641         mutex_unlock(&phydev->lock);
 642
 643         atomic_dec(&phydev->irq_disable);
 644         enable_irq(phydev->irq);
 645
 646         /* Reenable interrupts */
 647         if (PHY_HALTED != phydev->state &&
 648             phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
 649                 goto irq_enable_err;
 650
 651         /* reschedule state queue work to run as soon as possible */
 652         cancel_delayed_work_sync(&phydev->state_queue);
 653         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 654         return;
 655
 656 ignore:
 657         atomic_dec(&phydev->irq_disable);
 658         enable_irq(phydev->irq);
 659         return;
 660
 661 irq_enable_err:
 662         disable_irq(phydev->irq);
 663         atomic_inc(&phydev->irq_disable);
 664 phy_err:
 665         phy_error(phydev);
 666 }
 667
 668 /**
 669  * phy_stop - Bring down the PHY link, and stop checking the status
 670  * @phydev: target phy_device struct
 671  */
 672 void phy_stop(struct phy_device *phydev)
 673 {
 674         mutex_lock(&phydev->lock);
 675
 676         if (PHY_HALTED == phydev->state)
 677                 goto out_unlock;
 678
 679         if (phy_interrupt_is_valid(phydev)) {
 680                 /* Disable PHY Interrupts */
 681                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 682
 683                 /* Clear any pending interrupts */
 684                 phy_clear_interrupt(phydev);
 685         }
 686
 687         phydev->state = PHY_HALTED;
 688
 689 out_unlock:
 690         mutex_unlock(&phydev->lock);
 691
 692         /* Cannot call flush_scheduled_work() here as desired because
 693          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 694          * will not reenable interrupts.
 695          */
 696 }
 697 EXPORT_SYMBOL(phy_stop);
 698
 699 /**
 700  * phy_start - start or restart a PHY device
 701  * @phydev: target phy_device struct
 702  *
 703  * Description: Indicates the attached device's readiness to
 704  *   handle PHY-related work.  Used during startup to start the
 705  *   PHY, and after a call to phy_stop() to resume operation.
 706  *   Also used to indicate the MDIO bus has cleared an error
 707  *   condition.
 708  */
 709 void phy_start(struct phy_device *phydev)
 710 {
 711         mutex_lock(&phydev->lock);
 712
 713         switch (phydev->state) {
 714         case PHY_STARTING:
 715                 phydev->state = PHY_PENDING;
 716                 break;
 717         case PHY_READY:
 718                 phydev->state = PHY_UP;
 719                 break;
 720         case PHY_HALTED:
 721                 phydev->state = PHY_RESUMING;
 722         default:
 723                 break;
 724         }
 725         mutex_unlock(&phydev->lock);
 726 }
 727 EXPORT_SYMBOL(phy_start);
 728
 729 /**
 730  * phy_state_machine - Handle the state machine
 731  * @work: work_struct that describes the work to be done
 732  */
 733 void phy_state_machine(struct work_struct *work)
 734 {
 735         struct delayed_work *dwork = to_delayed_work(work);
 736         struct phy_device *phydev =
 737                         container_of(dwork, struct phy_device, state_queue);
 738         bool needs_aneg = false, do_suspend = false, do_resume = false;
 739         int err = 0;
 740
 741         mutex_lock(&phydev->lock);
 742
 743         if (phydev->drv->link_change_notify)
 744                 phydev->drv->link_change_notify(phydev);
 745
 746         switch (phydev->state) {
 747         case PHY_DOWN:
 748         case PHY_STARTING:
 749         case PHY_READY:
 750         case PHY_PENDING:
 751                 break;
 752         case PHY_UP:
 753                 needs_aneg = true;
 754
 755                 phydev->link_timeout = PHY_AN_TIMEOUT;
 756
 757                 break;
 758         case PHY_AN:
 759                 err = phy_read_status(phydev);
 760                 if (err < 0)
 761                         break;
 762
 763                 /* If the link is down, give up on negotiation for now */
 764                 if (!phydev->link) {
 765                         phydev->state = PHY_NOLINK;
 766                         netif_carrier_off(phydev->attached_dev);
 767                         phydev->adjust_link(phydev->attached_dev);
 768                         break;
 769                 }
 770
 771                 /* Check if negotiation is done.  Break if there's an error */
 772                 err = phy_aneg_done(phydev);
 773                 if (err < 0)
 774                         break;
 775
 776                 /* If AN is done, we're running */
 777                 if (err > 0) {
 778                         phydev->state = PHY_RUNNING;
 779                         netif_carrier_on(phydev->attached_dev);
 780                         phydev->adjust_link(phydev->attached_dev);
 781
 782                 } else if (0 == phydev->link_timeout--)
 783                         needs_aneg = true;
 784                 break;
 785         case PHY_NOLINK:
 786                 err = phy_read_status(phydev);
 787                 if (err)
 788                         break;
 789
 790                 if (phydev->link) {
 791                         if (AUTONEG_ENABLE == phydev->autoneg) {
 792                                 err = phy_aneg_done(phydev);
 793                                 if (err < 0)
 794                                         break;
 795
 796                                 if (!err) {
 797                                         phydev->state = PHY_AN;
 798                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 799                                         break;
 800                                 }
 801                         }
 802                         phydev->state = PHY_RUNNING;
 803                         netif_carrier_on(phydev->attached_dev);
 804                         phydev->adjust_link(phydev->attached_dev);
 805                 }
 806                 break;
 807         case PHY_FORCING:
 808                 err = genphy_update_link(phydev);
 809                 if (err)
 810                         break;
 811
 812                 if (phydev->link) {
 813                         phydev->state = PHY_RUNNING;
 814                         netif_carrier_on(phydev->attached_dev);
 815                 } else {
 816                         if (0 == phydev->link_timeout--)
 817                                 needs_aneg = true;
 818                 }
 819
 820                 phydev->adjust_link(phydev->attached_dev);
 821                 break;
 822         case PHY_RUNNING:
 823                 /* Only register a CHANGE if we are
 824                  * polling or ignoring interrupts
 825                  */
 826                 if (!phy_interrupt_is_valid(phydev))
 827                         phydev->state = PHY_CHANGELINK;
 828                 break;
 829         case PHY_CHANGELINK:
 830                 err = phy_read_status(phydev);
 831                 if (err)
 832                         break;
 833
 834                 if (phydev->link) {
 835                         phydev->state = PHY_RUNNING;
 836                         netif_carrier_on(phydev->attached_dev);
 837                 } else {
 838                         phydev->state = PHY_NOLINK;
 839                         netif_carrier_off(phydev->attached_dev);
 840                 }
 841
 842                 phydev->adjust_link(phydev->attached_dev);
 843
 844                 if (phy_interrupt_is_valid(phydev))
 845                         err = phy_config_interrupt(phydev,
 846                                                    PHY_INTERRUPT_ENABLED);
 847                 break;
 848         case PHY_HALTED:
 849                 if (phydev->link) {
 850                         phydev->link = 0;
 851                         netif_carrier_off(phydev->attached_dev);
 852                         phydev->adjust_link(phydev->attached_dev);
 853                         do_suspend = true;
 854                 }
 855                 break;
 856         case PHY_RESUMING:
 857                 err = phy_clear_interrupt(phydev);
 858                 if (err)
 859                         break;
 860
 861                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 862                 if (err)
 863                         break;
 864
 865                 if (AUTONEG_ENABLE == phydev->autoneg) {
 866                         err = phy_aneg_done(phydev);
 867                         if (err < 0)
 868                                 break;
 869
 870                         /* err > 0 if AN is done.
 871                          * Otherwise, it's 0, and we're  still waiting for AN
 872                          */
 873                         if (err > 0) {
 874                                 err = phy_read_status(phydev);
 875                                 if (err)
 876                                         break;
 877
 878                                 if (phydev->link) {
 879                                         phydev->state = PHY_RUNNING;
 880                                         netif_carrier_on(phydev->attached_dev);
 881                                 } else  {
 882                                         phydev->state = PHY_NOLINK;
 883                                 }
 884                                 phydev->adjust_link(phydev->attached_dev);
 885                         } else {
 886                                 phydev->state = PHY_AN;
 887                                 phydev->link_timeout = PHY_AN_TIMEOUT;
 888                         }
 889                 } else {
 890                         err = phy_read_status(phydev);
 891                         if (err)
 892                                 break;
 893
 894                         if (phydev->link) {
 895                                 phydev->state = PHY_RUNNING;
 896                                 netif_carrier_on(phydev->attached_dev);
 897                         } else  {
 898                                 phydev->state = PHY_NOLINK;
 899                         }
 900                         phydev->adjust_link(phydev->attached_dev);
 901                 }
 902                 do_resume = true;
 903                 break;
 904         }
 905
 906         mutex_unlock(&phydev->lock);
 907
 908         if (needs_aneg)
 909                 err = phy_start_aneg(phydev);
 910         else if (do_suspend)
 911                 phy_suspend(phydev);
 912         else if (do_resume)
 913                 phy_resume(phydev);
 914
 915         if (err < 0)
 916                 phy_error(phydev);
 917
 918         queue_delayed_work(system_power_efficient_wq, &phydev->state_queue,
 919                            PHY_STATE_TIME * HZ);
 920 }
 921
 922 void phy_mac_interrupt(struct phy_device *phydev, int new_link)
 923 {
 924         cancel_work_sync(&phydev->phy_queue);
 925         phydev->link = new_link;
 926         schedule_work(&phydev->phy_queue);
 927 }
 928 EXPORT_SYMBOL(phy_mac_interrupt);
 929
 930 static inline void mmd_phy_indirect(struct mii_bus *bus, int prtad, int devad,
 931                                     int addr)
 932 {
 933         /* Write the desired MMD Devad */
 934         bus->write(bus, addr, MII_MMD_CTRL, devad);
 935
 936         /* Write the desired MMD register address */
 937         bus->write(bus, addr, MII_MMD_DATA, prtad);
 938
 939         /* Select the Function : DATA with no post increment */
 940         bus->write(bus, addr, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
 941 }
 942
 943 /**
 944  * phy_read_mmd_indirect - reads data from the MMD registers
 945  * @phydev: The PHY device bus
 946  * @prtad: MMD Address
 947  * @devad: MMD DEVAD
 948  * @addr: PHY address on the MII bus
 949  *
 950  * Description: it reads data from the MMD registers (clause 22 to access to
 951  * clause 45) of the specified phy address.
 952  * To read these register we have:
 953  * 1) Write reg 13 // DEVAD
 954  * 2) Write reg 14 // MMD Address
 955  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
 956  * 3) Read  reg 14 // Read MMD data
 957  */
 958 static int phy_read_mmd_indirect(struct phy_device *phydev, int prtad,
 959                                  int devad, int addr)
 960 {
 961         struct phy_driver *phydrv = phydev->drv;
 962         int value = -1;
 963
 964         if (phydrv->read_mmd_indirect == NULL) {
 965                 mmd_phy_indirect(phydev->bus, prtad, devad, addr);
 966
 967                 /* Read the content of the MMD's selected register */
 968                 value = phydev->bus->read(phydev->bus, addr, MII_MMD_DATA);
 969         } else {
 970                 value = phydrv->read_mmd_indirect(phydev, prtad, devad, addr);
 971         }
 972         return value;
 973 }
 974
 975 /**
 976  * phy_write_mmd_indirect - writes data to the MMD registers
 977  * @phydev: The PHY device
 978  * @prtad: MMD Address
 979  * @devad: MMD DEVAD
 980  * @addr: PHY address on the MII bus
 981  * @data: data to write in the MMD register
 982  *
 983  * Description: Write data from the MMD registers of the specified
 984  * phy address.
 985  * To write these register we have:
 986  * 1) Write reg 13 // DEVAD
 987  * 2) Write reg 14 // MMD Address
 988  * 3) Write reg 13 // MMD Data Command for MMD DEVAD
 989  * 3) Write reg 14 // Write MMD data
 990  */
 991 static void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
 992                                    int devad, int addr, u32 data)
 993 {
 994         struct phy_driver *phydrv = phydev->drv;
 995
 996         if (phydrv->write_mmd_indirect == NULL) {
 997                 mmd_phy_indirect(phydev->bus, prtad, devad, addr);
 998
 999                 /* Write the data into MMD's selected register */
1000                 phydev->bus->write(phydev->bus, addr, MII_MMD_DATA, data);
1001         } else {
1002                 phydrv->write_mmd_indirect(phydev, prtad, devad, addr, data);
1003         }
1004 }
1005
1006 /**
1007  * phy_init_eee - init and check the EEE feature
1008  * @phydev: target phy_device struct
1009  * @clk_stop_enable: PHY may stop the clock during LPI
1010  *
1011  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1012  * is supported by looking at the MMD registers 3.20 and 7.60/61
1013  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1014  * bit if required.
1015  */
1016 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1017 {
1018         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1019          * Also EEE feature is active when core is operating with MII, GMII
1020          * or RGMII.
1021          */
1022         if ((phydev->duplex == DUPLEX_FULL) &&
1023             ((phydev->interface == PHY_INTERFACE_MODE_MII) ||
1024             (phydev->interface == PHY_INTERFACE_MODE_GMII) ||
1025             (phydev->interface == PHY_INTERFACE_MODE_RGMII))) {
1026                 int eee_lp, eee_cap, eee_adv;
1027                 u32 lp, cap, adv;
1028                 int status;
1029                 unsigned int idx;
1030
1031                 /* Read phy status to properly get the right settings */
1032                 status = phy_read_status(phydev);
1033                 if (status)
1034                         return status;
1035
1036                 /* First check if the EEE ability is supported */
1037                 eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1038                                                 MDIO_MMD_PCS, phydev->addr);
1039                 if (eee_cap <= 0)
1040                         goto eee_exit_err;
1041
1042                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1043                 if (!cap)
1044                         goto eee_exit_err;
1045
1046                 /* Check which link settings negotiated and verify it in
1047                  * the EEE advertising registers.
1048                  */
1049                 eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1050                                                MDIO_MMD_AN, phydev->addr);
1051                 if (eee_lp <= 0)
1052                         goto eee_exit_err;
1053
1054                 eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1055                                                 MDIO_MMD_AN, phydev->addr);
1056                 if (eee_adv <= 0)
1057                         goto eee_exit_err;
1058
1059                 adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
1060                 lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
1061                 idx = phy_find_setting(phydev->speed, phydev->duplex);
1062                 if (!(lp & adv & settings[idx].setting))
1063                         goto eee_exit_err;
1064
1065                 if (clk_stop_enable) {
1066                         /* Configure the PHY to stop receiving xMII
1067                          * clock while it is signaling LPI.
1068                          */
1069                         int val = phy_read_mmd_indirect(phydev, MDIO_CTRL1,
1070                                                         MDIO_MMD_PCS,
1071                                                         phydev->addr);
1072                         if (val < 0)
1073                                 return val;
1074
1075                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1076                         phy_write_mmd_indirect(phydev, MDIO_CTRL1,
1077                                                MDIO_MMD_PCS, phydev->addr,
1078                                                val);
1079                 }
1080
1081                 return 0; /* EEE supported */
1082         }
1083 eee_exit_err:
1084         return -EPROTONOSUPPORT;
1085 }
1086 EXPORT_SYMBOL(phy_init_eee);
1087
1088 /**
1089  * phy_get_eee_err - report the EEE wake error count
1090  * @phydev: target phy_device struct
1091  *
1092  * Description: it is to report the number of time where the PHY
1093  * failed to complete its normal wake sequence.
1094  */
1095 int phy_get_eee_err(struct phy_device *phydev)
1096 {
1097         return phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_WK_ERR,
1098                                      MDIO_MMD_PCS, phydev->addr);
1099 }
1100 EXPORT_SYMBOL(phy_get_eee_err);
1101
1102 /**
1103  * phy_ethtool_get_eee - get EEE supported and status
1104  * @phydev: target phy_device struct
1105  * @data: ethtool_eee data
1106  *
1107  * Description: it reportes the Supported/Advertisement/LP Advertisement
1108  * capabilities.
1109  */
1110 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1111 {
1112         int val;
1113
1114         /* Get Supported EEE */
1115         val = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
1116                                     MDIO_MMD_PCS, phydev->addr);
1117         if (val < 0)
1118                 return val;
1119         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1120
1121         /* Get advertisement EEE */
1122         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
1123                                     MDIO_MMD_AN, phydev->addr);
1124         if (val < 0)
1125                 return val;
1126         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1127
1128         /* Get LP advertisement EEE */
1129         val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
1130                                     MDIO_MMD_AN, phydev->addr);
1131         if (val < 0)
1132                 return val;
1133         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1134
1135         return 0;
1136 }
1137 EXPORT_SYMBOL(phy_ethtool_get_eee);
1138
1139 /**
1140  * phy_ethtool_set_eee - set EEE supported and status
1141  * @phydev: target phy_device struct
1142  * @data: ethtool_eee data
1143  *
1144  * Description: it is to program the Advertisement EEE register.
1145  */
1146 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1147 {
1148         int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
1149
1150         phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN,
1151                                phydev->addr, val);
1152
1153         return 0;
1154 }
1155 EXPORT_SYMBOL(phy_ethtool_set_eee);
1156
1157 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1158 {
1159         if (phydev->drv->set_wol)
1160                 return phydev->drv->set_wol(phydev, wol);
1161
1162         return -EOPNOTSUPP;
1163 }
1164 EXPORT_SYMBOL(phy_ethtool_set_wol);
1165
1166 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1167 {
1168         if (phydev->drv->get_wol)
1169                 phydev->drv->get_wol(phydev, wol);
1170 }
1171 EXPORT_SYMBOL(phy_ethtool_get_wol);