git.oblomov.eu Git - linux-2.6/blob - drivers/net/phy/phy.c

   1 /*
   2  * drivers/net/phy/phy.c
   3  *
   4  * Framework for configuring and reading PHY devices
   5  * Based on code in sungem_phy.c and gianfar_phy.c
   6  *
   7  * Author: Andy Fleming
   8  *
   9  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/string.h>
  20 #include <linux/errno.h>
  21 #include <linux/unistd.h>
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/mm.h>
  31 #include <linux/module.h>
  32 #include <linux/mii.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/phy.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/uaccess.h>
  39
  40 /* Convenience function to print out the current phy status
  41  */
  42 void phy_print_status(struct phy_device *phydev)
  43 {
  44         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
  45                         phydev->link ? "Up" : "Down");
  46         if (phydev->link)
  47                 printk(" - %d/%s", phydev->speed,
  48                                 DUPLEX_FULL == phydev->duplex ?
  49                                 "Full" : "Half");
  50
  51         printk("\n");
  52 }
  53 EXPORT_SYMBOL(phy_print_status);
  54
  55
  56 /* Convenience functions for reading/writing a given PHY
  57  * register. They MUST NOT be called from interrupt context,
  58  * because the bus read/write functions may wait for an interrupt
  59  * to conclude the operation. */
  60 int phy_read(struct phy_device *phydev, u16 regnum)
  61 {
  62         int retval;
  63         struct mii_bus *bus = phydev->bus;
  64
  65         spin_lock_bh(&bus->mdio_lock);
  66         retval = bus->read(bus, phydev->addr, regnum);
  67         spin_unlock_bh(&bus->mdio_lock);
  68
  69         return retval;
  70 }
  71 EXPORT_SYMBOL(phy_read);
  72
  73 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  74 {
  75         int err;
  76         struct mii_bus *bus = phydev->bus;
  77
  78         spin_lock_bh(&bus->mdio_lock);
  79         err = bus->write(bus, phydev->addr, regnum, val);
  80         spin_unlock_bh(&bus->mdio_lock);
  81
  82         return err;
  83 }
  84 EXPORT_SYMBOL(phy_write);
  85
  86
  87 int phy_clear_interrupt(struct phy_device *phydev)
  88 {
  89         int err = 0;
  90
  91         if (phydev->drv->ack_interrupt)
  92                 err = phydev->drv->ack_interrupt(phydev);
  93
  94         return err;
  95 }
  96
  97
  98 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
  99 {
 100         int err = 0;
 101
 102         phydev->interrupts = interrupts;
 103         if (phydev->drv->config_intr)
 104                 err = phydev->drv->config_intr(phydev);
 105
 106         return err;
 107 }
 108
 109
 110 /* phy_aneg_done
 111  *
 112  * description: Reads the status register and returns 0 either if
 113  *   auto-negotiation is incomplete, or if there was an error.
 114  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 115  */
 116 static inline int phy_aneg_done(struct phy_device *phydev)
 117 {
 118         int retval;
 119
 120         retval = phy_read(phydev, MII_BMSR);
 121
 122         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 123 }
 124
 125 /* A structure for mapping a particular speed and duplex
 126  * combination to a particular SUPPORTED and ADVERTISED value */
 127 struct phy_setting {
 128         int speed;
 129         int duplex;
 130         u32 setting;
 131 };
 132
 133 /* A mapping of all SUPPORTED settings to speed/duplex */
 134 static const struct phy_setting settings[] = {
 135         {
 136                 .speed = 10000,
 137                 .duplex = DUPLEX_FULL,
 138                 .setting = SUPPORTED_10000baseT_Full,
 139         },
 140         {
 141                 .speed = SPEED_1000,
 142                 .duplex = DUPLEX_FULL,
 143                 .setting = SUPPORTED_1000baseT_Full,
 144         },
 145         {
 146                 .speed = SPEED_1000,
 147                 .duplex = DUPLEX_HALF,
 148                 .setting = SUPPORTED_1000baseT_Half,
 149         },
 150         {
 151                 .speed = SPEED_100,
 152                 .duplex = DUPLEX_FULL,
 153                 .setting = SUPPORTED_100baseT_Full,
 154         },
 155         {
 156                 .speed = SPEED_100,
 157                 .duplex = DUPLEX_HALF,
 158                 .setting = SUPPORTED_100baseT_Half,
 159         },
 160         {
 161                 .speed = SPEED_10,
 162                 .duplex = DUPLEX_FULL,
 163                 .setting = SUPPORTED_10baseT_Full,
 164         },
 165         {
 166                 .speed = SPEED_10,
 167                 .duplex = DUPLEX_HALF,
 168                 .setting = SUPPORTED_10baseT_Half,
 169         },
 170 };
 171
 172 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 173
 174 /* phy_find_setting
 175  *
 176  * description: Searches the settings array for the setting which
 177  *   matches the desired speed and duplex, and returns the index
 178  *   of that setting.  Returns the index of the last setting if
 179  *   none of the others match.
 180  */
 181 static inline int phy_find_setting(int speed, int duplex)
 182 {
 183         int idx = 0;
 184
 185         while (idx < ARRAY_SIZE(settings) &&
 186                         (settings[idx].speed != speed ||
 187                         settings[idx].duplex != duplex))
 188                 idx++;
 189
 190         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 191 }
 192
 193 /* phy_find_valid
 194  * idx: The first index in settings[] to search
 195  * features: A mask of the valid settings
 196  *
 197  * description: Returns the index of the first valid setting less
 198  *   than or equal to the one pointed to by idx, as determined by
 199  *   the mask in features.  Returns the index of the last setting
 200  *   if nothing else matches.
 201  */
 202 static inline int phy_find_valid(int idx, u32 features)
 203 {
 204         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 205                 idx++;
 206
 207         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 208 }
 209
 210 /* phy_sanitize_settings
 211  *
 212  * description: Make sure the PHY is set to supported speeds and
 213  *   duplexes.  Drop down by one in this order:  1000/FULL,
 214  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
 215  */
 216 void phy_sanitize_settings(struct phy_device *phydev)
 217 {
 218         u32 features = phydev->supported;
 219         int idx;
 220
 221         /* Sanitize settings based on PHY capabilities */
 222         if ((features & SUPPORTED_Autoneg) == 0)
 223                 phydev->autoneg = 0;
 224
 225         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 226                         features);
 227
 228         phydev->speed = settings[idx].speed;
 229         phydev->duplex = settings[idx].duplex;
 230 }
 231 EXPORT_SYMBOL(phy_sanitize_settings);
 232
 233 /* phy_ethtool_sset:
 234  * A generic ethtool sset function.  Handles all the details
 235  *
 236  * A few notes about parameter checking:
 237  * - We don't set port or transceiver, so we don't care what they
 238  *   were set to.
 239  * - phy_start_aneg() will make sure forced settings are sane, and
 240  *   choose the next best ones from the ones selected, so we don't
 241  *   care if ethtool tries to give us bad values
 242  *
 243  */
 244 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 245 {
 246         if (cmd->phy_address != phydev->addr)
 247                 return -EINVAL;
 248
 249         /* We make sure that we don't pass unsupported
 250          * values in to the PHY */
 251         cmd->advertising &= phydev->supported;
 252
 253         /* Verify the settings we care about. */
 254         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 255                 return -EINVAL;
 256
 257         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 258                 return -EINVAL;
 259
 260         if (cmd->autoneg == AUTONEG_DISABLE
 261                         && ((cmd->speed != SPEED_1000
 262                                         && cmd->speed != SPEED_100
 263                                         && cmd->speed != SPEED_10)
 264                                 || (cmd->duplex != DUPLEX_HALF
 265                                         && cmd->duplex != DUPLEX_FULL)))
 266                 return -EINVAL;
 267
 268         phydev->autoneg = cmd->autoneg;
 269
 270         phydev->speed = cmd->speed;
 271
 272         phydev->advertising = cmd->advertising;
 273
 274         if (AUTONEG_ENABLE == cmd->autoneg)
 275                 phydev->advertising |= ADVERTISED_Autoneg;
 276         else
 277                 phydev->advertising &= ~ADVERTISED_Autoneg;
 278
 279         phydev->duplex = cmd->duplex;
 280
 281         /* Restart the PHY */
 282         phy_start_aneg(phydev);
 283
 284         return 0;
 285 }
 286
 287 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 288 {
 289         cmd->supported = phydev->supported;
 290
 291         cmd->advertising = phydev->advertising;
 292
 293         cmd->speed = phydev->speed;
 294         cmd->duplex = phydev->duplex;
 295         cmd->port = PORT_MII;
 296         cmd->phy_address = phydev->addr;
 297         cmd->transceiver = XCVR_EXTERNAL;
 298         cmd->autoneg = phydev->autoneg;
 299
 300         return 0;
 301 }
 302
 303
 304 /* Note that this function is currently incompatible with the
 305  * PHYCONTROL layer.  It changes registers without regard to
 306  * current state.  Use at own risk
 307  */
 308 int phy_mii_ioctl(struct phy_device *phydev,
 309                 struct mii_ioctl_data *mii_data, int cmd)
 310 {
 311         u16 val = mii_data->val_in;
 312
 313         switch (cmd) {
 314         case SIOCGMIIPHY:
 315                 mii_data->phy_id = phydev->addr;
 316                 break;
 317         case SIOCGMIIREG:
 318                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 319                 break;
 320
 321         case SIOCSMIIREG:
 322                 if (!capable(CAP_NET_ADMIN))
 323                         return -EPERM;
 324
 325                 if (mii_data->phy_id == phydev->addr) {
 326                         switch(mii_data->reg_num) {
 327                         case MII_BMCR:
 328                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 329                                         phydev->autoneg = AUTONEG_DISABLE;
 330                                 else
 331                                         phydev->autoneg = AUTONEG_ENABLE;
 332                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 333                                         phydev->duplex = DUPLEX_FULL;
 334                                 else
 335                                         phydev->duplex = DUPLEX_HALF;
 336                                 break;
 337                         case MII_ADVERTISE:
 338                                 phydev->advertising = val;
 339                                 break;
 340                         default:
 341                                 /* do nothing */
 342                                 break;
 343                         }
 344                 }
 345
 346                 phy_write(phydev, mii_data->reg_num, val);
 347
 348                 if (mii_data->reg_num == MII_BMCR
 349                                 && val & BMCR_RESET
 350                                 && phydev->drv->config_init)
 351                         phydev->drv->config_init(phydev);
 352                 break;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /* phy_start_aneg
 359  *
 360  * description: Sanitizes the settings (if we're not
 361  *   autonegotiating them), and then calls the driver's
 362  *   config_aneg function.  If the PHYCONTROL Layer is operating,
 363  *   we change the state to reflect the beginning of
 364  *   Auto-negotiation or forcing.
 365  */
 366 int phy_start_aneg(struct phy_device *phydev)
 367 {
 368         int err;
 369
 370         spin_lock(&phydev->lock);
 371
 372         if (AUTONEG_DISABLE == phydev->autoneg)
 373                 phy_sanitize_settings(phydev);
 374
 375         err = phydev->drv->config_aneg(phydev);
 376
 377         if (err < 0)
 378                 goto out_unlock;
 379
 380         if (phydev->state != PHY_HALTED) {
 381                 if (AUTONEG_ENABLE == phydev->autoneg) {
 382                         phydev->state = PHY_AN;
 383                         phydev->link_timeout = PHY_AN_TIMEOUT;
 384                 } else {
 385                         phydev->state = PHY_FORCING;
 386                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 387                 }
 388         }
 389
 390 out_unlock:
 391         spin_unlock(&phydev->lock);
 392         return err;
 393 }
 394 EXPORT_SYMBOL(phy_start_aneg);
 395
 396
 397 static void phy_change(void *data);
 398 static void phy_timer(unsigned long data);
 399
 400 /* phy_start_machine:
 401  *
 402  * description: The PHY infrastructure can run a state machine
 403  *   which tracks whether the PHY is starting up, negotiating,
 404  *   etc.  This function starts the timer which tracks the state
 405  *   of the PHY.  If you want to be notified when the state
 406  *   changes, pass in the callback, otherwise, pass NULL.  If you
 407  *   want to maintain your own state machine, do not call this
 408  *   function. */
 409 void phy_start_machine(struct phy_device *phydev,
 410                 void (*handler)(struct net_device *))
 411 {
 412         phydev->adjust_state = handler;
 413
 414         init_timer(&phydev->phy_timer);
 415         phydev->phy_timer.function = &phy_timer;
 416         phydev->phy_timer.data = (unsigned long) phydev;
 417         mod_timer(&phydev->phy_timer, jiffies + HZ);
 418 }
 419
 420 /* phy_stop_machine
 421  *
 422  * description: Stops the state machine timer, sets the state to UP
 423  *   (unless it wasn't up yet). This function must be called BEFORE
 424  *   phy_detach.
 425  */
 426 void phy_stop_machine(struct phy_device *phydev)
 427 {
 428         del_timer_sync(&phydev->phy_timer);
 429
 430         spin_lock(&phydev->lock);
 431         if (phydev->state > PHY_UP)
 432                 phydev->state = PHY_UP;
 433         spin_unlock(&phydev->lock);
 434
 435         phydev->adjust_state = NULL;
 436 }
 437
 438 /* phy_force_reduction
 439  *
 440  * description: Reduces the speed/duplex settings by
 441  *   one notch.  The order is so:
 442  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
 443  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
 444  */
 445 static void phy_force_reduction(struct phy_device *phydev)
 446 {
 447         int idx;
 448
 449         idx = phy_find_setting(phydev->speed, phydev->duplex);
 450
 451         idx++;
 452
 453         idx = phy_find_valid(idx, phydev->supported);
 454
 455         phydev->speed = settings[idx].speed;
 456         phydev->duplex = settings[idx].duplex;
 457
 458         pr_info("Trying %d/%s\n", phydev->speed,
 459                         DUPLEX_FULL == phydev->duplex ?
 460                         "FULL" : "HALF");
 461 }
 462
 463
 464 /* phy_error:
 465  *
 466  * Moves the PHY to the HALTED state in response to a read
 467  * or write error, and tells the controller the link is down.
 468  * Must not be called from interrupt context, or while the
 469  * phydev->lock is held.
 470  */
 471 void phy_error(struct phy_device *phydev)
 472 {
 473         spin_lock(&phydev->lock);
 474         phydev->state = PHY_HALTED;
 475         spin_unlock(&phydev->lock);
 476 }
 477
 478 /* phy_interrupt
 479  *
 480  * description: When a PHY interrupt occurs, the handler disables
 481  * interrupts, and schedules a work task to clear the interrupt.
 482  */
 483 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 484 {
 485         struct phy_device *phydev = phy_dat;
 486
 487         /* The MDIO bus is not allowed to be written in interrupt
 488          * context, so we need to disable the irq here.  A work
 489          * queue will write the PHY to disable and clear the
 490          * interrupt, and then reenable the irq line. */
 491         disable_irq_nosync(irq);
 492
 493         schedule_work(&phydev->phy_queue);
 494
 495         return IRQ_HANDLED;
 496 }
 497
 498 /* Enable the interrupts from the PHY side */
 499 int phy_enable_interrupts(struct phy_device *phydev)
 500 {
 501         int err;
 502
 503         err = phy_clear_interrupt(phydev);
 504
 505         if (err < 0)
 506                 return err;
 507
 508         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 509
 510         return err;
 511 }
 512 EXPORT_SYMBOL(phy_enable_interrupts);
 513
 514 /* Disable the PHY interrupts from the PHY side */
 515 int phy_disable_interrupts(struct phy_device *phydev)
 516 {
 517         int err;
 518
 519         /* Disable PHY interrupts */
 520         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 521
 522         if (err)
 523                 goto phy_err;
 524
 525         /* Clear the interrupt */
 526         err = phy_clear_interrupt(phydev);
 527
 528         if (err)
 529                 goto phy_err;
 530
 531         return 0;
 532
 533 phy_err:
 534         phy_error(phydev);
 535
 536         return err;
 537 }
 538 EXPORT_SYMBOL(phy_disable_interrupts);
 539
 540 /* phy_start_interrupts
 541  *
 542  * description: Request the interrupt for the given PHY.  If
 543  *   this fails, then we set irq to PHY_POLL.
 544  *   Otherwise, we enable the interrupts in the PHY.
 545  *   Returns 0 on success.
 546  *   This should only be called with a valid IRQ number.
 547  */
 548 int phy_start_interrupts(struct phy_device *phydev)
 549 {
 550         int err = 0;
 551
 552         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
 553
 554         if (request_irq(phydev->irq, phy_interrupt,
 555                                 IRQF_SHARED,
 556                                 "phy_interrupt",
 557                                 phydev) < 0) {
 558                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 559                                 phydev->bus->name,
 560                                 phydev->irq);
 561                 phydev->irq = PHY_POLL;
 562                 return 0;
 563         }
 564
 565         err = phy_enable_interrupts(phydev);
 566
 567         return err;
 568 }
 569 EXPORT_SYMBOL(phy_start_interrupts);
 570
 571 int phy_stop_interrupts(struct phy_device *phydev)
 572 {
 573         int err;
 574
 575         err = phy_disable_interrupts(phydev);
 576
 577         if (err)
 578                 phy_error(phydev);
 579
 580         free_irq(phydev->irq, phydev);
 581
 582         return err;
 583 }
 584 EXPORT_SYMBOL(phy_stop_interrupts);
 585
 586
 587 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
 588 static void phy_change(void *data)
 589 {
 590         int err;
 591         struct phy_device *phydev = data;
 592
 593         err = phy_disable_interrupts(phydev);
 594
 595         if (err)
 596                 goto phy_err;
 597
 598         spin_lock(&phydev->lock);
 599         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 600                 phydev->state = PHY_CHANGELINK;
 601         spin_unlock(&phydev->lock);
 602
 603         enable_irq(phydev->irq);
 604
 605         /* Reenable interrupts */
 606         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 607
 608         if (err)
 609                 goto irq_enable_err;
 610
 611         return;
 612
 613 irq_enable_err:
 614         disable_irq(phydev->irq);
 615 phy_err:
 616         phy_error(phydev);
 617 }
 618
 619 /* Bring down the PHY link, and stop checking the status. */
 620 void phy_stop(struct phy_device *phydev)
 621 {
 622         spin_lock(&phydev->lock);
 623
 624         if (PHY_HALTED == phydev->state)
 625                 goto out_unlock;
 626
 627         if (phydev->irq != PHY_POLL) {
 628                 /* Clear any pending interrupts */
 629                 phy_clear_interrupt(phydev);
 630
 631                 /* Disable PHY Interrupts */
 632                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 633         }
 634
 635         phydev->state = PHY_HALTED;
 636
 637 out_unlock:
 638         spin_unlock(&phydev->lock);
 639 }
 640
 641
 642 /* phy_start
 643  *
 644  * description: Indicates the attached device's readiness to
 645  *   handle PHY-related work.  Used during startup to start the
 646  *   PHY, and after a call to phy_stop() to resume operation.
 647  *   Also used to indicate the MDIO bus has cleared an error
 648  *   condition.
 649  */
 650 void phy_start(struct phy_device *phydev)
 651 {
 652         spin_lock(&phydev->lock);
 653
 654         switch (phydev->state) {
 655                 case PHY_STARTING:
 656                         phydev->state = PHY_PENDING;
 657                         break;
 658                 case PHY_READY:
 659                         phydev->state = PHY_UP;
 660                         break;
 661                 case PHY_HALTED:
 662                         phydev->state = PHY_RESUMING;
 663                 default:
 664                         break;
 665         }
 666         spin_unlock(&phydev->lock);
 667 }
 668 EXPORT_SYMBOL(phy_stop);
 669 EXPORT_SYMBOL(phy_start);
 670
 671 /* PHY timer which handles the state machine */
 672 static void phy_timer(unsigned long data)
 673 {
 674         struct phy_device *phydev = (struct phy_device *)data;
 675         int needs_aneg = 0;
 676         int err = 0;
 677
 678         spin_lock(&phydev->lock);
 679
 680         if (phydev->adjust_state)
 681                 phydev->adjust_state(phydev->attached_dev);
 682
 683         switch(phydev->state) {
 684                 case PHY_DOWN:
 685                 case PHY_STARTING:
 686                 case PHY_READY:
 687                 case PHY_PENDING:
 688                         break;
 689                 case PHY_UP:
 690                         needs_aneg = 1;
 691
 692                         phydev->link_timeout = PHY_AN_TIMEOUT;
 693
 694                         break;
 695                 case PHY_AN:
 696                         /* Check if negotiation is done.  Break
 697                          * if there's an error */
 698                         err = phy_aneg_done(phydev);
 699                         if (err < 0)
 700                                 break;
 701
 702                         /* If auto-negotiation is done, we change to
 703                          * either RUNNING, or NOLINK */
 704                         if (err > 0) {
 705                                 err = phy_read_status(phydev);
 706
 707                                 if (err)
 708                                         break;
 709
 710                                 if (phydev->link) {
 711                                         phydev->state = PHY_RUNNING;
 712                                         netif_carrier_on(phydev->attached_dev);
 713                                 } else {
 714                                         phydev->state = PHY_NOLINK;
 715                                         netif_carrier_off(phydev->attached_dev);
 716                                 }
 717
 718                                 phydev->adjust_link(phydev->attached_dev);
 719
 720                         } else if (0 == phydev->link_timeout--) {
 721                                 /* The counter expired, so either we
 722                                  * switch to forced mode, or the
 723                                  * magic_aneg bit exists, and we try aneg
 724                                  * again */
 725                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
 726                                         int idx;
 727
 728                                         /* We'll start from the
 729                                          * fastest speed, and work
 730                                          * our way down */
 731                                         idx = phy_find_valid(0,
 732                                                         phydev->supported);
 733
 734                                         phydev->speed = settings[idx].speed;
 735                                         phydev->duplex = settings[idx].duplex;
 736
 737                                         phydev->autoneg = AUTONEG_DISABLE;
 738                                         phydev->state = PHY_FORCING;
 739                                         phydev->link_timeout =
 740                                                 PHY_FORCE_TIMEOUT;
 741
 742                                         pr_info("Trying %d/%s\n",
 743                                                         phydev->speed,
 744                                                         DUPLEX_FULL ==
 745                                                         phydev->duplex ?
 746                                                         "FULL" : "HALF");
 747                                 }
 748
 749                                 needs_aneg = 1;
 750                         }
 751                         break;
 752                 case PHY_NOLINK:
 753                         err = phy_read_status(phydev);
 754
 755                         if (err)
 756                                 break;
 757
 758                         if (phydev->link) {
 759                                 phydev->state = PHY_RUNNING;
 760                                 netif_carrier_on(phydev->attached_dev);
 761                                 phydev->adjust_link(phydev->attached_dev);
 762                         }
 763                         break;
 764                 case PHY_FORCING:
 765                         err = phy_read_status(phydev);
 766
 767                         if (err)
 768                                 break;
 769
 770                         if (phydev->link) {
 771                                 phydev->state = PHY_RUNNING;
 772                                 netif_carrier_on(phydev->attached_dev);
 773                         } else {
 774                                 if (0 == phydev->link_timeout--) {
 775                                         phy_force_reduction(phydev);
 776                                         needs_aneg = 1;
 777                                 }
 778                         }
 779
 780                         phydev->adjust_link(phydev->attached_dev);
 781                         break;
 782                 case PHY_RUNNING:
 783                         /* Only register a CHANGE if we are
 784                          * polling */
 785                         if (PHY_POLL == phydev->irq)
 786                                 phydev->state = PHY_CHANGELINK;
 787                         break;
 788                 case PHY_CHANGELINK:
 789                         err = phy_read_status(phydev);
 790
 791                         if (err)
 792                                 break;
 793
 794                         if (phydev->link) {
 795                                 phydev->state = PHY_RUNNING;
 796                                 netif_carrier_on(phydev->attached_dev);
 797                         } else {
 798                                 phydev->state = PHY_NOLINK;
 799                                 netif_carrier_off(phydev->attached_dev);
 800                         }
 801
 802                         phydev->adjust_link(phydev->attached_dev);
 803
 804                         if (PHY_POLL != phydev->irq)
 805                                 err = phy_config_interrupt(phydev,
 806                                                 PHY_INTERRUPT_ENABLED);
 807                         break;
 808                 case PHY_HALTED:
 809                         if (phydev->link) {
 810                                 phydev->link = 0;
 811                                 netif_carrier_off(phydev->attached_dev);
 812                                 phydev->adjust_link(phydev->attached_dev);
 813                         }
 814                         break;
 815                 case PHY_RESUMING:
 816
 817                         err = phy_clear_interrupt(phydev);
 818
 819                         if (err)
 820                                 break;
 821
 822                         err = phy_config_interrupt(phydev,
 823                                         PHY_INTERRUPT_ENABLED);
 824
 825                         if (err)
 826                                 break;
 827
 828                         if (AUTONEG_ENABLE == phydev->autoneg) {
 829                                 err = phy_aneg_done(phydev);
 830                                 if (err < 0)
 831                                         break;
 832
 833                                 /* err > 0 if AN is done.
 834                                  * Otherwise, it's 0, and we're
 835                                  * still waiting for AN */
 836                                 if (err > 0) {
 837                                         phydev->state = PHY_RUNNING;
 838                                 } else {
 839                                         phydev->state = PHY_AN;
 840                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 841                                 }
 842                         } else
 843                                 phydev->state = PHY_RUNNING;
 844                         break;
 845         }
 846
 847         spin_unlock(&phydev->lock);
 848
 849         if (needs_aneg)
 850                 err = phy_start_aneg(phydev);
 851
 852         if (err < 0)
 853                 phy_error(phydev);
 854
 855         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 856 }
 857