SAFE public projects git trees. - safe/jmp/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 static void phy_timer(unsigned long data);
  43
  44 /* Convenience function to print out the current phy status
  45  */
  46 void phy_print_status(struct phy_device *phydev)
  47 {
  48         pr_info("%s: Link is %s", phydev->dev.bus_id,
  49                         phydev->link ? "Up" : "Down");
  50         if (phydev->link)
  51                 printk(" - %d/%s", phydev->speed,
  52                                 DUPLEX_FULL == phydev->duplex ?
  53                                 "Full" : "Half");
  54
  55         printk("\n");
  56 }
  57 EXPORT_SYMBOL(phy_print_status);
  58
  59
  60 /* Convenience functions for reading/writing a given PHY
  61  * register. They MUST NOT be called from interrupt context,
  62  * because the bus read/write functions may wait for an interrupt
  63  * to conclude the operation. */
  64 int phy_read(struct phy_device *phydev, u16 regnum)
  65 {
  66         int retval;
  67         struct mii_bus *bus = phydev->bus;
  68
  69         spin_lock_bh(&bus->mdio_lock);
  70         retval = bus->read(bus, phydev->addr, regnum);
  71         spin_unlock_bh(&bus->mdio_lock);
  72
  73         return retval;
  74 }
  75 EXPORT_SYMBOL(phy_read);
  76
  77 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  78 {
  79         int err;
  80         struct mii_bus *bus = phydev->bus;
  81
  82         spin_lock_bh(&bus->mdio_lock);
  83         err = bus->write(bus, phydev->addr, regnum, val);
  84         spin_unlock_bh(&bus->mdio_lock);
  85
  86         return err;
  87 }
  88 EXPORT_SYMBOL(phy_write);
  89
  90
  91 int phy_clear_interrupt(struct phy_device *phydev)
  92 {
  93         int err = 0;
  94
  95         if (phydev->drv->ack_interrupt)
  96                 err = phydev->drv->ack_interrupt(phydev);
  97
  98         return err;
  99 }
 100
 101
 102 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 103 {
 104         int err = 0;
 105
 106         phydev->interrupts = interrupts;
 107         if (phydev->drv->config_intr)
 108                 err = phydev->drv->config_intr(phydev);
 109
 110         return err;
 111 }
 112
 113
 114 /* phy_aneg_done
 115  *
 116  * description: Reads the status register and returns 0 either if
 117  *   auto-negotiation is incomplete, or if there was an error.
 118  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 119  */
 120 static inline int phy_aneg_done(struct phy_device *phydev)
 121 {
 122         int retval;
 123
 124         retval = phy_read(phydev, MII_BMSR);
 125
 126         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 127 }
 128
 129 /* phy_start_aneg
 130  *
 131  * description: Calls the PHY driver's config_aneg, and then
 132  *   sets the PHY state to PHY_AN if auto-negotiation is enabled,
 133  *   and to PHY_FORCING if auto-negotiation is disabled. Unless
 134  *   the PHY is currently HALTED.
 135  */
 136 int phy_start_aneg(struct phy_device *phydev)
 137 {
 138         int err;
 139
 140         spin_lock(&phydev->lock);
 141
 142         if (AUTONEG_DISABLE == phydev->autoneg)
 143                 phy_sanitize_settings(phydev);
 144
 145         err = phydev->drv->config_aneg(phydev);
 146
 147         if (err < 0)
 148                 goto out_unlock;
 149
 150         if (phydev->state != PHY_HALTED) {
 151                 if (AUTONEG_ENABLE == phydev->autoneg) {
 152                         phydev->state = PHY_AN;
 153                         phydev->link_timeout = PHY_AN_TIMEOUT;
 154                 } else {
 155                         phydev->state = PHY_FORCING;
 156                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 157                 }
 158         }
 159
 160 out_unlock:
 161         spin_unlock(&phydev->lock);
 162         return err;
 163 }
 164 EXPORT_SYMBOL(phy_start_aneg);
 165
 166
 167 /* A structure for mapping a particular speed and duplex
 168  * combination to a particular SUPPORTED and ADVERTISED value */
 169 struct phy_setting {
 170         int speed;
 171         int duplex;
 172         u32 setting;
 173 };
 174
 175 /* A mapping of all SUPPORTED settings to speed/duplex */
 176 static struct phy_setting settings[] = {
 177         {
 178                 .speed = 10000,
 179                 .duplex = DUPLEX_FULL,
 180                 .setting = SUPPORTED_10000baseT_Full,
 181         },
 182         {
 183                 .speed = SPEED_1000,
 184                 .duplex = DUPLEX_FULL,
 185                 .setting = SUPPORTED_1000baseT_Full,
 186         },
 187         {
 188                 .speed = SPEED_1000,
 189                 .duplex = DUPLEX_HALF,
 190                 .setting = SUPPORTED_1000baseT_Half,
 191         },
 192         {
 193                 .speed = SPEED_100,
 194                 .duplex = DUPLEX_FULL,
 195                 .setting = SUPPORTED_100baseT_Full,
 196         },
 197         {
 198                 .speed = SPEED_100,
 199                 .duplex = DUPLEX_HALF,
 200                 .setting = SUPPORTED_100baseT_Half,
 201         },
 202         {
 203                 .speed = SPEED_10,
 204                 .duplex = DUPLEX_FULL,
 205                 .setting = SUPPORTED_10baseT_Full,
 206         },
 207         {
 208                 .speed = SPEED_10,
 209                 .duplex = DUPLEX_HALF,
 210                 .setting = SUPPORTED_10baseT_Half,
 211         },
 212 };
 213
 214 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 215
 216 /* phy_find_setting
 217  *
 218  * description: Searches the settings array for the setting which
 219  *   matches the desired speed and duplex, and returns the index
 220  *   of that setting.  Returns the index of the last setting if
 221  *   none of the others match.
 222  */
 223 static inline int phy_find_setting(int speed, int duplex)
 224 {
 225         int idx = 0;
 226
 227         while (idx < ARRAY_SIZE(settings) &&
 228                         (settings[idx].speed != speed ||
 229                         settings[idx].duplex != duplex))
 230                 idx++;
 231
 232         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 233 }
 234
 235 /* phy_find_valid
 236  * idx: The first index in settings[] to search
 237  * features: A mask of the valid settings
 238  *
 239  * description: Returns the index of the first valid setting less
 240  *   than or equal to the one pointed to by idx, as determined by
 241  *   the mask in features.  Returns the index of the last setting
 242  *   if nothing else matches.
 243  */
 244 static inline int phy_find_valid(int idx, u32 features)
 245 {
 246         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 247                 idx++;
 248
 249         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 250 }
 251
 252 /* phy_sanitize_settings
 253  *
 254  * description: Make sure the PHY is set to supported speeds and
 255  *   duplexes.  Drop down by one in this order:  1000/FULL,
 256  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
 257  */
 258 void phy_sanitize_settings(struct phy_device *phydev)
 259 {
 260         u32 features = phydev->supported;
 261         int idx;
 262
 263         /* Sanitize settings based on PHY capabilities */
 264         if ((features & SUPPORTED_Autoneg) == 0)
 265                 phydev->autoneg = 0;
 266
 267         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 268                         features);
 269
 270         phydev->speed = settings[idx].speed;
 271         phydev->duplex = settings[idx].duplex;
 272 }
 273 EXPORT_SYMBOL(phy_sanitize_settings);
 274
 275 /* phy_force_reduction
 276  *
 277  * description: Reduces the speed/duplex settings by
 278  *   one notch.  The order is so:
 279  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
 280  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
 281  */
 282 static void phy_force_reduction(struct phy_device *phydev)
 283 {
 284         int idx;
 285
 286         idx = phy_find_setting(phydev->speed, phydev->duplex);
 287
 288         idx++;
 289
 290         idx = phy_find_valid(idx, phydev->supported);
 291
 292         phydev->speed = settings[idx].speed;
 293         phydev->duplex = settings[idx].duplex;
 294
 295         pr_info("Trying %d/%s\n", phydev->speed,
 296                         DUPLEX_FULL == phydev->duplex ?
 297                         "FULL" : "HALF");
 298 }
 299
 300 /* phy_ethtool_sset:
 301  * A generic ethtool sset function.  Handles all the details
 302  *
 303  * A few notes about parameter checking:
 304  * - We don't set port or transceiver, so we don't care what they
 305  *   were set to.
 306  * - phy_start_aneg() will make sure forced settings are sane, and
 307  *   choose the next best ones from the ones selected, so we don't
 308  *   care if ethtool tries to give us bad values
 309  */
 310 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 311 {
 312         if (cmd->phy_address != phydev->addr)
 313                 return -EINVAL;
 314
 315         /* We make sure that we don't pass unsupported
 316          * values in to the PHY */
 317         cmd->advertising &= phydev->supported;
 318
 319         /* Verify the settings we care about. */
 320         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 321                 return -EINVAL;
 322
 323         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 324                 return -EINVAL;
 325
 326         if (cmd->autoneg == AUTONEG_DISABLE
 327                         && ((cmd->speed != SPEED_1000
 328                                         && cmd->speed != SPEED_100
 329                                         && cmd->speed != SPEED_10)
 330                                 || (cmd->duplex != DUPLEX_HALF
 331                                         && cmd->duplex != DUPLEX_FULL)))
 332                 return -EINVAL;
 333
 334         phydev->autoneg = cmd->autoneg;
 335
 336         phydev->speed = cmd->speed;
 337
 338         phydev->advertising = cmd->advertising;
 339
 340         if (AUTONEG_ENABLE == cmd->autoneg)
 341                 phydev->advertising |= ADVERTISED_Autoneg;
 342         else
 343                 phydev->advertising &= ~ADVERTISED_Autoneg;
 344
 345         phydev->duplex = cmd->duplex;
 346
 347         /* Restart the PHY */
 348         phy_start_aneg(phydev);
 349
 350         return 0;
 351 }
 352
 353 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 354 {
 355         cmd->supported = phydev->supported;
 356
 357         cmd->advertising = phydev->advertising;
 358
 359         cmd->speed = phydev->speed;
 360         cmd->duplex = phydev->duplex;
 361         cmd->port = PORT_MII;
 362         cmd->phy_address = phydev->addr;
 363         cmd->transceiver = XCVR_EXTERNAL;
 364         cmd->autoneg = phydev->autoneg;
 365
 366         return 0;
 367 }
 368
 369
 370 /* Note that this function is currently incompatible with the
 371  * PHYCONTROL layer.  It changes registers without regard to
 372  * current state.  Use at own risk
 373  */
 374 int phy_mii_ioctl(struct phy_device *phydev,
 375                 struct mii_ioctl_data *mii_data, int cmd)
 376 {
 377         u16 val = mii_data->val_in;
 378
 379         switch (cmd) {
 380         case SIOCGMIIPHY:
 381                 mii_data->phy_id = phydev->addr;
 382                 break;
 383         case SIOCGMIIREG:
 384                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 385                 break;
 386
 387         case SIOCSMIIREG:
 388                 if (!capable(CAP_NET_ADMIN))
 389                         return -EPERM;
 390
 391                 if (mii_data->phy_id == phydev->addr) {
 392                         switch(mii_data->reg_num) {
 393                         case MII_BMCR:
 394                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 395                                         phydev->autoneg = AUTONEG_DISABLE;
 396                                 else
 397                                         phydev->autoneg = AUTONEG_ENABLE;
 398                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 399                                         phydev->duplex = DUPLEX_FULL;
 400                                 else
 401                                         phydev->duplex = DUPLEX_HALF;
 402                                 break;
 403                         case MII_ADVERTISE:
 404                                 phydev->advertising = val;
 405                                 break;
 406                         default:
 407                                 /* do nothing */
 408                                 break;
 409                         }
 410                 }
 411
 412                 phy_write(phydev, mii_data->reg_num, val);
 413
 414                 if (mii_data->reg_num == MII_BMCR
 415                                 && val & BMCR_RESET
 416                                 && phydev->drv->config_init)
 417                         phydev->drv->config_init(phydev);
 418                 break;
 419         }
 420
 421         return 0;
 422 }
 423
 424 /* phy_start_machine:
 425  *
 426  * description: The PHY infrastructure can run a state machine
 427  *   which tracks whether the PHY is starting up, negotiating,
 428  *   etc.  This function starts the timer which tracks the state
 429  *   of the PHY.  If you want to be notified when the state
 430  *   changes, pass in the callback, otherwise, pass NULL.  If you
 431  *   want to maintain your own state machine, do not call this
 432  *   function. */
 433 void phy_start_machine(struct phy_device *phydev,
 434                 void (*handler)(struct net_device *))
 435 {
 436         phydev->adjust_state = handler;
 437
 438         init_timer(&phydev->phy_timer);
 439         phydev->phy_timer.function = &phy_timer;
 440         phydev->phy_timer.data = (unsigned long) phydev;
 441         mod_timer(&phydev->phy_timer, jiffies + HZ);
 442 }
 443
 444 /* phy_stop_machine
 445  *
 446  * description: Stops the state machine timer, sets the state to
 447  *   UP (unless it wasn't up yet), and then frees the interrupt,
 448  *   if it is in use. This function must be called BEFORE
 449  *   phy_detach.
 450  */
 451 void phy_stop_machine(struct phy_device *phydev)
 452 {
 453         del_timer_sync(&phydev->phy_timer);
 454
 455         spin_lock(&phydev->lock);
 456         if (phydev->state > PHY_UP)
 457                 phydev->state = PHY_UP;
 458         spin_unlock(&phydev->lock);
 459
 460         if (phydev->irq != PHY_POLL)
 461                 phy_stop_interrupts(phydev);
 462
 463         phydev->adjust_state = NULL;
 464 }
 465
 466 /* phy_error:
 467  *
 468  * Moves the PHY to the HALTED state in response to a read
 469  * or write error, and tells the controller the link is down.
 470  * Must not be called from interrupt context, or while the
 471  * phydev->lock is held.
 472  */
 473 void phy_error(struct phy_device *phydev)
 474 {
 475         spin_lock(&phydev->lock);
 476         phydev->state = PHY_HALTED;
 477         spin_unlock(&phydev->lock);
 478 }
 479
 480 #ifdef CONFIG_PHYCONTROL
 481
 482 static void phy_change(void *data);
 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 #endif /* CONFIG_PHYCONTROL */
 678
 679 /* PHY timer which handles the state machine */
 680 static void phy_timer(unsigned long data)
 681 {
 682         struct phy_device *phydev = (struct phy_device *)data;
 683         int needs_aneg = 0;
 684         int err = 0;
 685
 686         spin_lock(&phydev->lock);
 687
 688         if (phydev->adjust_state)
 689                 phydev->adjust_state(phydev->attached_dev);
 690
 691         switch(phydev->state) {
 692                 case PHY_DOWN:
 693                 case PHY_STARTING:
 694                 case PHY_READY:
 695                 case PHY_PENDING:
 696                         break;
 697                 case PHY_UP:
 698                         needs_aneg = 1;
 699
 700                         phydev->link_timeout = PHY_AN_TIMEOUT;
 701
 702                         break;
 703                 case PHY_AN:
 704                         /* Check if negotiation is done.  Break
 705                          * if there's an error */
 706                         err = phy_aneg_done(phydev);
 707                         if (err < 0)
 708                                 break;
 709
 710                         /* If auto-negotiation is done, we change to
 711                          * either RUNNING, or NOLINK */
 712                         if (err > 0) {
 713                                 err = phy_read_status(phydev);
 714
 715                                 if (err)
 716                                         break;
 717
 718                                 if (phydev->link) {
 719                                         phydev->state = PHY_RUNNING;
 720                                         netif_carrier_on(phydev->attached_dev);
 721                                 } else {
 722                                         phydev->state = PHY_NOLINK;
 723                                         netif_carrier_off(phydev->attached_dev);
 724                                 }
 725
 726                                 phydev->adjust_link(phydev->attached_dev);
 727
 728                         } else if (0 == phydev->link_timeout--) {
 729                                 /* The counter expired, so either we
 730                                  * switch to forced mode, or the
 731                                  * magic_aneg bit exists, and we try aneg
 732                                  * again */
 733                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
 734                                         int idx;
 735
 736                                         /* We'll start from the
 737                                          * fastest speed, and work
 738                                          * our way down */
 739                                         idx = phy_find_valid(0,
 740                                                         phydev->supported);
 741
 742                                         phydev->speed = settings[idx].speed;
 743                                         phydev->duplex = settings[idx].duplex;
 744
 745                                         phydev->autoneg = AUTONEG_DISABLE;
 746                                         phydev->state = PHY_FORCING;
 747                                         phydev->link_timeout =
 748                                                 PHY_FORCE_TIMEOUT;
 749
 750                                         pr_info("Trying %d/%s\n",
 751                                                         phydev->speed,
 752                                                         DUPLEX_FULL ==
 753                                                         phydev->duplex ?
 754                                                         "FULL" : "HALF");
 755                                 }
 756
 757                                 needs_aneg = 1;
 758                         }
 759                         break;
 760                 case PHY_NOLINK:
 761                         err = phy_read_status(phydev);
 762
 763                         if (err)
 764                                 break;
 765
 766                         if (phydev->link) {
 767                                 phydev->state = PHY_RUNNING;
 768                                 netif_carrier_on(phydev->attached_dev);
 769                                 phydev->adjust_link(phydev->attached_dev);
 770                         }
 771                         break;
 772                 case PHY_FORCING:
 773                         err = phy_read_status(phydev);
 774
 775                         if (err)
 776                                 break;
 777
 778                         if (phydev->link) {
 779                                 phydev->state = PHY_RUNNING;
 780                                 netif_carrier_on(phydev->attached_dev);
 781                         } else {
 782                                 if (0 == phydev->link_timeout--) {
 783                                         phy_force_reduction(phydev);
 784                                         needs_aneg = 1;
 785                                 }
 786                         }
 787
 788                         phydev->adjust_link(phydev->attached_dev);
 789                         break;
 790                 case PHY_RUNNING:
 791                         /* Only register a CHANGE if we are
 792                          * polling */
 793                         if (PHY_POLL == phydev->irq)
 794                                 phydev->state = PHY_CHANGELINK;
 795                         break;
 796                 case PHY_CHANGELINK:
 797                         err = phy_read_status(phydev);
 798
 799                         if (err)
 800                                 break;
 801
 802                         if (phydev->link) {
 803                                 phydev->state = PHY_RUNNING;
 804                                 netif_carrier_on(phydev->attached_dev);
 805                         } else {
 806                                 phydev->state = PHY_NOLINK;
 807                                 netif_carrier_off(phydev->attached_dev);
 808                         }
 809
 810                         phydev->adjust_link(phydev->attached_dev);
 811
 812                         if (PHY_POLL != phydev->irq)
 813                                 err = phy_config_interrupt(phydev,
 814                                                 PHY_INTERRUPT_ENABLED);
 815                         break;
 816                 case PHY_HALTED:
 817                         if (phydev->link) {
 818                                 phydev->link = 0;
 819                                 netif_carrier_off(phydev->attached_dev);
 820                                 phydev->adjust_link(phydev->attached_dev);
 821                         }
 822                         break;
 823                 case PHY_RESUMING:
 824
 825                         err = phy_clear_interrupt(phydev);
 826
 827                         if (err)
 828                                 break;
 829
 830                         err = phy_config_interrupt(phydev,
 831                                         PHY_INTERRUPT_ENABLED);
 832
 833                         if (err)
 834                                 break;
 835
 836                         if (AUTONEG_ENABLE == phydev->autoneg) {
 837                                 err = phy_aneg_done(phydev);
 838                                 if (err < 0)
 839                                         break;
 840
 841                                 /* err > 0 if AN is done.
 842                                  * Otherwise, it's 0, and we're
 843                                  * still waiting for AN */
 844                                 if (err > 0) {
 845                                         phydev->state = PHY_RUNNING;
 846                                 } else {
 847                                         phydev->state = PHY_AN;
 848                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 849                                 }
 850                         } else
 851                                 phydev->state = PHY_RUNNING;
 852                         break;
 853         }
 854
 855         spin_unlock(&phydev->lock);
 856
 857         if (needs_aneg)
 858                 err = phy_start_aneg(phydev);
 859
 860         if (err < 0)
 861                 phy_error(phydev);
 862
 863         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 864 }
 865