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/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/unistd.h>
  23 #include <linux/slab.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/mm.h>
  32 #include <linux/module.h>
  33 #include <linux/version.h>
  34 #include <linux/mii.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/phy.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/uaccess.h>
  41
  42 /* Convenience function to print out the current phy status
  43  */
  44 void phy_print_status(struct phy_device *phydev)
  45 {
  46         pr_info("%s: Link is %s", phydev->dev.bus_id,
  47                         phydev->link ? "Up" : "Down");
  48         if (phydev->link)
  49                 printk(" - %d/%s", phydev->speed,
  50                                 DUPLEX_FULL == phydev->duplex ?
  51                                 "Full" : "Half");
  52
  53         printk("\n");
  54 }
  55 EXPORT_SYMBOL(phy_print_status);
  56
  57
  58 /* Convenience functions for reading/writing a given PHY
  59  * register. They MUST NOT be called from interrupt context,
  60  * because the bus read/write functions may wait for an interrupt
  61  * to conclude the operation. */
  62 int phy_read(struct phy_device *phydev, u16 regnum)
  63 {
  64         int retval;
  65         struct mii_bus *bus = phydev->bus;
  66
  67         spin_lock_bh(&bus->mdio_lock);
  68         retval = bus->read(bus, phydev->addr, regnum);
  69         spin_unlock_bh(&bus->mdio_lock);
  70
  71         return retval;
  72 }
  73 EXPORT_SYMBOL(phy_read);
  74
  75 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  76 {
  77         int err;
  78         struct mii_bus *bus = phydev->bus;
  79
  80         spin_lock_bh(&bus->mdio_lock);
  81         err = bus->write(bus, phydev->addr, regnum, val);
  82         spin_unlock_bh(&bus->mdio_lock);
  83
  84         return err;
  85 }
  86 EXPORT_SYMBOL(phy_write);
  87
  88
  89 int phy_clear_interrupt(struct phy_device *phydev)
  90 {
  91         int err = 0;
  92
  93         if (phydev->drv->ack_interrupt)
  94                 err = phydev->drv->ack_interrupt(phydev);
  95
  96         return err;
  97 }
  98
  99
 100 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 101 {
 102         int err = 0;
 103
 104         phydev->interrupts = interrupts;
 105         if (phydev->drv->config_intr)
 106                 err = phydev->drv->config_intr(phydev);
 107
 108         return err;
 109 }
 110
 111
 112 /* phy_aneg_done
 113  *
 114  * description: Reads the status register and returns 0 either if
 115  *   auto-negotiation is incomplete, or if there was an error.
 116  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 117  */
 118 static inline int phy_aneg_done(struct phy_device *phydev)
 119 {
 120         int retval;
 121
 122         retval = phy_read(phydev, MII_BMSR);
 123
 124         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 125 }
 126
 127 /* A structure for mapping a particular speed and duplex
 128  * combination to a particular SUPPORTED and ADVERTISED value */
 129 struct phy_setting {
 130         int speed;
 131         int duplex;
 132         u32 setting;
 133 };
 134
 135 /* A mapping of all SUPPORTED settings to speed/duplex */
 136 static struct phy_setting settings[] = {
 137         {
 138                 .speed = 10000,
 139                 .duplex = DUPLEX_FULL,
 140                 .setting = SUPPORTED_10000baseT_Full,
 141         },
 142         {
 143                 .speed = SPEED_1000,
 144                 .duplex = DUPLEX_FULL,
 145                 .setting = SUPPORTED_1000baseT_Full,
 146         },
 147         {
 148                 .speed = SPEED_1000,
 149                 .duplex = DUPLEX_HALF,
 150                 .setting = SUPPORTED_1000baseT_Half,
 151         },
 152         {
 153                 .speed = SPEED_100,
 154                 .duplex = DUPLEX_FULL,
 155                 .setting = SUPPORTED_100baseT_Full,
 156         },
 157         {
 158                 .speed = SPEED_100,
 159                 .duplex = DUPLEX_HALF,
 160                 .setting = SUPPORTED_100baseT_Half,
 161         },
 162         {
 163                 .speed = SPEED_10,
 164                 .duplex = DUPLEX_FULL,
 165                 .setting = SUPPORTED_10baseT_Full,
 166         },
 167         {
 168                 .speed = SPEED_10,
 169                 .duplex = DUPLEX_HALF,
 170                 .setting = SUPPORTED_10baseT_Half,
 171         },
 172 };
 173
 174 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 175
 176 /* phy_find_setting
 177  *
 178  * description: Searches the settings array for the setting which
 179  *   matches the desired speed and duplex, and returns the index
 180  *   of that setting.  Returns the index of the last setting if
 181  *   none of the others match.
 182  */
 183 static inline int phy_find_setting(int speed, int duplex)
 184 {
 185         int idx = 0;
 186
 187         while (idx < ARRAY_SIZE(settings) &&
 188                         (settings[idx].speed != speed ||
 189                         settings[idx].duplex != duplex))
 190                 idx++;
 191
 192         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 193 }
 194
 195 /* phy_find_valid
 196  * idx: The first index in settings[] to search
 197  * features: A mask of the valid settings
 198  *
 199  * description: Returns the index of the first valid setting less
 200  *   than or equal to the one pointed to by idx, as determined by
 201  *   the mask in features.  Returns the index of the last setting
 202  *   if nothing else matches.
 203  */
 204 static inline int phy_find_valid(int idx, u32 features)
 205 {
 206         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 207                 idx++;
 208
 209         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 210 }
 211
 212 /* phy_sanitize_settings
 213  *
 214  * description: Make sure the PHY is set to supported speeds and
 215  *   duplexes.  Drop down by one in this order:  1000/FULL,
 216  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
 217  */
 218 void phy_sanitize_settings(struct phy_device *phydev)
 219 {
 220         u32 features = phydev->supported;
 221         int idx;
 222
 223         /* Sanitize settings based on PHY capabilities */
 224         if ((features & SUPPORTED_Autoneg) == 0)
 225                 phydev->autoneg = 0;
 226
 227         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 228                         features);
 229
 230         phydev->speed = settings[idx].speed;
 231         phydev->duplex = settings[idx].duplex;
 232 }
 233 EXPORT_SYMBOL(phy_sanitize_settings);
 234
 235 /* phy_ethtool_sset:
 236  * A generic ethtool sset function.  Handles all the details
 237  *
 238  * A few notes about parameter checking:
 239  * - We don't set port or transceiver, so we don't care what they
 240  *   were set to.
 241  * - phy_start_aneg() will make sure forced settings are sane, and
 242  *   choose the next best ones from the ones selected, so we don't
 243  *   care if ethtool tries to give us bad values
 244  *
 245  */
 246 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 247 {
 248         if (cmd->phy_address != phydev->addr)
 249                 return -EINVAL;
 250
 251         /* We make sure that we don't pass unsupported
 252          * values in to the PHY */
 253         cmd->advertising &= phydev->supported;
 254
 255         /* Verify the settings we care about. */
 256         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 257                 return -EINVAL;
 258
 259         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 260                 return -EINVAL;
 261
 262         if (cmd->autoneg == AUTONEG_DISABLE
 263                         && ((cmd->speed != SPEED_1000
 264                                         && cmd->speed != SPEED_100
 265                                         && cmd->speed != SPEED_10)
 266                                 || (cmd->duplex != DUPLEX_HALF
 267                                         && cmd->duplex != DUPLEX_FULL)))
 268                 return -EINVAL;
 269
 270         phydev->autoneg = cmd->autoneg;
 271
 272         phydev->speed = cmd->speed;
 273
 274         phydev->advertising = cmd->advertising;
 275
 276         if (AUTONEG_ENABLE == cmd->autoneg)
 277                 phydev->advertising |= ADVERTISED_Autoneg;
 278         else
 279                 phydev->advertising &= ~ADVERTISED_Autoneg;
 280
 281         phydev->duplex = cmd->duplex;
 282
 283         /* Restart the PHY */
 284         phy_start_aneg(phydev);
 285
 286         return 0;
 287 }
 288
 289 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 290 {
 291         cmd->supported = phydev->supported;
 292
 293         cmd->advertising = phydev->advertising;
 294
 295         cmd->speed = phydev->speed;
 296         cmd->duplex = phydev->duplex;
 297         cmd->port = PORT_MII;
 298         cmd->phy_address = phydev->addr;
 299         cmd->transceiver = XCVR_EXTERNAL;
 300         cmd->autoneg = phydev->autoneg;
 301
 302         return 0;
 303 }
 304
 305
 306 /* Note that this function is currently incompatible with the
 307  * PHYCONTROL layer.  It changes registers without regard to
 308  * current state.  Use at own risk
 309  */
 310 int phy_mii_ioctl(struct phy_device *phydev,
 311                 struct mii_ioctl_data *mii_data, int cmd)
 312 {
 313         u16 val = mii_data->val_in;
 314
 315         switch (cmd) {
 316         case SIOCGMIIPHY:
 317                 mii_data->phy_id = phydev->addr;
 318                 break;
 319         case SIOCGMIIREG:
 320                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 321                 break;
 322
 323         case SIOCSMIIREG:
 324                 if (!capable(CAP_NET_ADMIN))
 325                         return -EPERM;
 326
 327                 if (mii_data->phy_id == phydev->addr) {
 328                         switch(mii_data->reg_num) {
 329                         case MII_BMCR:
 330                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 331                                         phydev->autoneg = AUTONEG_DISABLE;
 332                                 else
 333                                         phydev->autoneg = AUTONEG_ENABLE;
 334                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 335                                         phydev->duplex = DUPLEX_FULL;
 336                                 else
 337                                         phydev->duplex = DUPLEX_HALF;
 338                                 break;
 339                         case MII_ADVERTISE:
 340                                 phydev->advertising = val;
 341                                 break;
 342                         default:
 343                                 /* do nothing */
 344                                 break;
 345                         }
 346                 }
 347
 348                 phy_write(phydev, mii_data->reg_num, val);
 349
 350                 if (mii_data->reg_num == MII_BMCR
 351                                 && val & BMCR_RESET
 352                                 && phydev->drv->config_init)
 353                         phydev->drv->config_init(phydev);
 354                 break;
 355         }
 356
 357         return 0;
 358 }
 359
 360 /* phy_start_aneg
 361  *
 362  * description: Sanitizes the settings (if we're not
 363  *   autonegotiating them), and then calls the driver's
 364  *   config_aneg function.  If the PHYCONTROL Layer is operating,
 365  *   we change the state to reflect the beginning of
 366  *   Auto-negotiation or forcing.
 367  */
 368 int phy_start_aneg(struct phy_device *phydev)
 369 {
 370         int err;
 371
 372         spin_lock(&phydev->lock);
 373
 374         if (AUTONEG_DISABLE == phydev->autoneg)
 375                 phy_sanitize_settings(phydev);
 376
 377         err = phydev->drv->config_aneg(phydev);
 378
 379         if (err < 0)
 380                 goto out_unlock;
 381
 382         if (phydev->state != PHY_HALTED) {
 383                 if (AUTONEG_ENABLE == phydev->autoneg) {
 384                         phydev->state = PHY_AN;
 385                         phydev->link_timeout = PHY_AN_TIMEOUT;
 386                 } else {
 387                         phydev->state = PHY_FORCING;
 388                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 389                 }
 390         }
 391
 392 out_unlock:
 393         spin_unlock(&phydev->lock);
 394         return err;
 395 }
 396 EXPORT_SYMBOL(phy_start_aneg);
 397
 398
 399 static void phy_change(void *data);
 400 static void phy_timer(unsigned long data);
 401
 402 /* phy_start_machine:
 403  *
 404  * description: The PHY infrastructure can run a state machine
 405  *   which tracks whether the PHY is starting up, negotiating,
 406  *   etc.  This function starts the timer which tracks the state
 407  *   of the PHY.  If you want to be notified when the state
 408  *   changes, pass in the callback, otherwise, pass NULL.  If you
 409  *   want to maintain your own state machine, do not call this
 410  *   function. */
 411 void phy_start_machine(struct phy_device *phydev,
 412                 void (*handler)(struct net_device *))
 413 {
 414         phydev->adjust_state = handler;
 415
 416         init_timer(&phydev->phy_timer);
 417         phydev->phy_timer.function = &phy_timer;
 418         phydev->phy_timer.data = (unsigned long) phydev;
 419         mod_timer(&phydev->phy_timer, jiffies + HZ);
 420 }
 421
 422 /* phy_stop_machine
 423  *
 424  * description: Stops the state machine timer, sets the state to
 425  *   UP (unless it wasn't up yet), and then frees the interrupt,
 426  *   if it is in use. This function must be called BEFORE
 427  *   phy_detach.
 428  */
 429 void phy_stop_machine(struct phy_device *phydev)
 430 {
 431         del_timer_sync(&phydev->phy_timer);
 432
 433         spin_lock(&phydev->lock);
 434         if (phydev->state > PHY_UP)
 435                 phydev->state = PHY_UP;
 436         spin_unlock(&phydev->lock);
 437
 438         if (phydev->irq != PHY_POLL)
 439                 phy_stop_interrupts(phydev);
 440
 441         phydev->adjust_state = NULL;
 442 }
 443
 444 /* phy_force_reduction
 445  *
 446  * description: Reduces the speed/duplex settings by
 447  *   one notch.  The order is so:
 448  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
 449  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
 450  */
 451 static void phy_force_reduction(struct phy_device *phydev)
 452 {
 453         int idx;
 454
 455         idx = phy_find_setting(phydev->speed, phydev->duplex);
 456
 457         idx++;
 458
 459         idx = phy_find_valid(idx, phydev->supported);
 460
 461         phydev->speed = settings[idx].speed;
 462         phydev->duplex = settings[idx].duplex;
 463
 464         pr_info("Trying %d/%s\n", phydev->speed,
 465                         DUPLEX_FULL == phydev->duplex ?
 466                         "FULL" : "HALF");
 467 }
 468
 469
 470 /* phy_error:
 471  *
 472  * Moves the PHY to the HALTED state in response to a read
 473  * or write error, and tells the controller the link is down.
 474  * Must not be called from interrupt context, or while the
 475  * phydev->lock is held.
 476  */
 477 void phy_error(struct phy_device *phydev)
 478 {
 479         spin_lock(&phydev->lock);
 480         phydev->state = PHY_HALTED;
 481         spin_unlock(&phydev->lock);
 482 }
 483
 484 /* phy_interrupt
 485  *
 486  * description: When a PHY interrupt occurs, the handler disables
 487  * interrupts, and schedules a work task to clear the interrupt.
 488  */
 489 static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs)
 490 {
 491         struct phy_device *phydev = phy_dat;
 492
 493         /* The MDIO bus is not allowed to be written in interrupt
 494          * context, so we need to disable the irq here.  A work
 495          * queue will write the PHY to disable and clear the
 496          * interrupt, and then reenable the irq line. */
 497         disable_irq_nosync(irq);
 498
 499         schedule_work(&phydev->phy_queue);
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 /* Enable the interrupts from the PHY side */
 505 int phy_enable_interrupts(struct phy_device *phydev)
 506 {
 507         int err;
 508
 509         err = phy_clear_interrupt(phydev);
 510
 511         if (err < 0)
 512                 return err;
 513
 514         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 515
 516         return err;
 517 }
 518 EXPORT_SYMBOL(phy_enable_interrupts);
 519
 520 /* Disable the PHY interrupts from the PHY side */
 521 int phy_disable_interrupts(struct phy_device *phydev)
 522 {
 523         int err;
 524
 525         /* Disable PHY interrupts */
 526         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 527
 528         if (err)
 529                 goto phy_err;
 530
 531         /* Clear the interrupt */
 532         err = phy_clear_interrupt(phydev);
 533
 534         if (err)
 535                 goto phy_err;
 536
 537         return 0;
 538
 539 phy_err:
 540         phy_error(phydev);
 541
 542         return err;
 543 }
 544 EXPORT_SYMBOL(phy_disable_interrupts);
 545
 546 /* phy_start_interrupts
 547  *
 548  * description: Request the interrupt for the given PHY.  If
 549  *   this fails, then we set irq to PHY_POLL.
 550  *   Otherwise, we enable the interrupts in the PHY.
 551  *   Returns 0 on success.
 552  *   This should only be called with a valid IRQ number.
 553  */
 554 int phy_start_interrupts(struct phy_device *phydev)
 555 {
 556         int err = 0;
 557
 558         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
 559
 560         if (request_irq(phydev->irq, phy_interrupt,
 561                                 SA_SHIRQ,
 562                                 "phy_interrupt",
 563                                 phydev) < 0) {
 564                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 565                                 phydev->bus->name,
 566                                 phydev->irq);
 567                 phydev->irq = PHY_POLL;
 568                 return 0;
 569         }
 570
 571         err = phy_enable_interrupts(phydev);
 572
 573         return err;
 574 }
 575 EXPORT_SYMBOL(phy_start_interrupts);
 576
 577 int phy_stop_interrupts(struct phy_device *phydev)
 578 {
 579         int err;
 580
 581         err = phy_disable_interrupts(phydev);
 582
 583         if (err)
 584                 phy_error(phydev);
 585
 586         free_irq(phydev->irq, phydev);
 587
 588         return err;
 589 }
 590 EXPORT_SYMBOL(phy_stop_interrupts);
 591
 592
 593 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
 594 static void phy_change(void *data)
 595 {
 596         int err;
 597         struct phy_device *phydev = data;
 598
 599         err = phy_disable_interrupts(phydev);
 600
 601         if (err)
 602                 goto phy_err;
 603
 604         spin_lock(&phydev->lock);
 605         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 606                 phydev->state = PHY_CHANGELINK;
 607         spin_unlock(&phydev->lock);
 608
 609         enable_irq(phydev->irq);
 610
 611         /* Reenable interrupts */
 612         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 613
 614         if (err)
 615                 goto irq_enable_err;
 616
 617         return;
 618
 619 irq_enable_err:
 620         disable_irq(phydev->irq);
 621 phy_err:
 622         phy_error(phydev);
 623 }
 624
 625 /* Bring down the PHY link, and stop checking the status. */
 626 void phy_stop(struct phy_device *phydev)
 627 {
 628         spin_lock(&phydev->lock);
 629
 630         if (PHY_HALTED == phydev->state)
 631                 goto out_unlock;
 632
 633         if (phydev->irq != PHY_POLL) {
 634                 /* Clear any pending interrupts */
 635                 phy_clear_interrupt(phydev);
 636
 637                 /* Disable PHY Interrupts */
 638                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 639         }
 640
 641         phydev->state = PHY_HALTED;
 642
 643 out_unlock:
 644         spin_unlock(&phydev->lock);
 645 }
 646
 647
 648 /* phy_start
 649  *
 650  * description: Indicates the attached device's readiness to
 651  *   handle PHY-related work.  Used during startup to start the
 652  *   PHY, and after a call to phy_stop() to resume operation.
 653  *   Also used to indicate the MDIO bus has cleared an error
 654  *   condition.
 655  */
 656 void phy_start(struct phy_device *phydev)
 657 {
 658         spin_lock(&phydev->lock);
 659
 660         switch (phydev->state) {
 661                 case PHY_STARTING:
 662                         phydev->state = PHY_PENDING;
 663                         break;
 664                 case PHY_READY:
 665                         phydev->state = PHY_UP;
 666                         break;
 667                 case PHY_HALTED:
 668                         phydev->state = PHY_RESUMING;
 669                 default:
 670                         break;
 671         }
 672         spin_unlock(&phydev->lock);
 673 }
 674 EXPORT_SYMBOL(phy_stop);
 675 EXPORT_SYMBOL(phy_start);
 676
 677 /* PHY timer which handles the state machine */
 678 static void phy_timer(unsigned long data)
 679 {
 680         struct phy_device *phydev = (struct phy_device *)data;
 681         int needs_aneg = 0;
 682         int err = 0;
 683
 684         spin_lock(&phydev->lock);
 685
 686         if (phydev->adjust_state)
 687                 phydev->adjust_state(phydev->attached_dev);
 688
 689         switch(phydev->state) {
 690                 case PHY_DOWN:
 691                 case PHY_STARTING:
 692                 case PHY_READY:
 693                 case PHY_PENDING:
 694                         break;
 695                 case PHY_UP:
 696                         needs_aneg = 1;
 697
 698                         phydev->link_timeout = PHY_AN_TIMEOUT;
 699
 700                         break;
 701                 case PHY_AN:
 702                         /* Check if negotiation is done.  Break
 703                          * if there's an error */
 704                         err = phy_aneg_done(phydev);
 705                         if (err < 0)
 706                                 break;
 707
 708                         /* If auto-negotiation is done, we change to
 709                          * either RUNNING, or NOLINK */
 710                         if (err > 0) {
 711                                 err = phy_read_status(phydev);
 712
 713                                 if (err)
 714                                         break;
 715
 716                                 if (phydev->link) {
 717                                         phydev->state = PHY_RUNNING;
 718                                         netif_carrier_on(phydev->attached_dev);
 719                                 } else {
 720                                         phydev->state = PHY_NOLINK;
 721                                         netif_carrier_off(phydev->attached_dev);
 722                                 }
 723
 724                                 phydev->adjust_link(phydev->attached_dev);
 725
 726                         } else if (0 == phydev->link_timeout--) {
 727                                 /* The counter expired, so either we
 728                                  * switch to forced mode, or the
 729                                  * magic_aneg bit exists, and we try aneg
 730                                  * again */
 731                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
 732                                         int idx;
 733
 734                                         /* We'll start from the
 735                                          * fastest speed, and work
 736                                          * our way down */
 737                                         idx = phy_find_valid(0,
 738                                                         phydev->supported);
 739
 740                                         phydev->speed = settings[idx].speed;
 741                                         phydev->duplex = settings[idx].duplex;
 742
 743                                         phydev->autoneg = AUTONEG_DISABLE;
 744                                         phydev->state = PHY_FORCING;
 745                                         phydev->link_timeout =
 746                                                 PHY_FORCE_TIMEOUT;
 747
 748                                         pr_info("Trying %d/%s\n",
 749                                                         phydev->speed,
 750                                                         DUPLEX_FULL ==
 751                                                         phydev->duplex ?
 752                                                         "FULL" : "HALF");
 753                                 }
 754
 755                                 needs_aneg = 1;
 756                         }
 757                         break;
 758                 case PHY_NOLINK:
 759                         err = phy_read_status(phydev);
 760
 761                         if (err)
 762                                 break;
 763
 764                         if (phydev->link) {
 765                                 phydev->state = PHY_RUNNING;
 766                                 netif_carrier_on(phydev->attached_dev);
 767                                 phydev->adjust_link(phydev->attached_dev);
 768                         }
 769                         break;
 770                 case PHY_FORCING:
 771                         err = phy_read_status(phydev);
 772
 773                         if (err)
 774                                 break;
 775
 776                         if (phydev->link) {
 777                                 phydev->state = PHY_RUNNING;
 778                                 netif_carrier_on(phydev->attached_dev);
 779                         } else {
 780                                 if (0 == phydev->link_timeout--) {
 781                                         phy_force_reduction(phydev);
 782                                         needs_aneg = 1;
 783                                 }
 784                         }
 785
 786                         phydev->adjust_link(phydev->attached_dev);
 787                         break;
 788                 case PHY_RUNNING:
 789                         /* Only register a CHANGE if we are
 790                          * polling */
 791                         if (PHY_POLL == phydev->irq)
 792                                 phydev->state = PHY_CHANGELINK;
 793                         break;
 794                 case PHY_CHANGELINK:
 795                         err = phy_read_status(phydev);
 796
 797                         if (err)
 798                                 break;
 799
 800                         if (phydev->link) {
 801                                 phydev->state = PHY_RUNNING;
 802                                 netif_carrier_on(phydev->attached_dev);
 803                         } else {
 804                                 phydev->state = PHY_NOLINK;
 805                                 netif_carrier_off(phydev->attached_dev);
 806                         }
 807
 808                         phydev->adjust_link(phydev->attached_dev);
 809
 810                         if (PHY_POLL != phydev->irq)
 811                                 err = phy_config_interrupt(phydev,
 812                                                 PHY_INTERRUPT_ENABLED);
 813                         break;
 814                 case PHY_HALTED:
 815                         if (phydev->link) {
 816                                 phydev->link = 0;
 817                                 netif_carrier_off(phydev->attached_dev);
 818                                 phydev->adjust_link(phydev->attached_dev);
 819                         }
 820                         break;
 821                 case PHY_RESUMING:
 822
 823                         err = phy_clear_interrupt(phydev);
 824
 825                         if (err)
 826                                 break;
 827
 828                         err = phy_config_interrupt(phydev,
 829                                         PHY_INTERRUPT_ENABLED);
 830
 831                         if (err)
 832                                 break;
 833
 834                         if (AUTONEG_ENABLE == phydev->autoneg) {
 835                                 err = phy_aneg_done(phydev);
 836                                 if (err < 0)
 837                                         break;
 838
 839                                 /* err > 0 if AN is done.
 840                                  * Otherwise, it's 0, and we're
 841                                  * still waiting for AN */
 842                                 if (err > 0) {
 843                                         phydev->state = PHY_RUNNING;
 844                                 } else {
 845                                         phydev->state = PHY_AN;
 846                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 847                                 }
 848                         } else
 849                                 phydev->state = PHY_RUNNING;
 850                         break;
 851         }
 852
 853         spin_unlock(&phydev->lock);
 854
 855         if (needs_aneg)
 856                 err = phy_start_aneg(phydev);
 857
 858         if (err < 0)
 859                 phy_error(phydev);
 860
 861         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 862 }
 863