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   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  * A note about the PHYCONTROL Layer.  If you turn off
 246  * CONFIG_PHYCONTROL, you will need to read the PHY status
 247  * registers after this function completes, and update your
 248  * controller manually.
 249  */
 250 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 251 {
 252         if (cmd->phy_address != phydev->addr)
 253                 return -EINVAL;
 254
 255         /* We make sure that we don't pass unsupported
 256          * values in to the PHY */
 257         cmd->advertising &= phydev->supported;
 258
 259         /* Verify the settings we care about. */
 260         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 261                 return -EINVAL;
 262
 263         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 264                 return -EINVAL;
 265
 266         if (cmd->autoneg == AUTONEG_DISABLE
 267                         && ((cmd->speed != SPEED_1000
 268                                         && cmd->speed != SPEED_100
 269                                         && cmd->speed != SPEED_10)
 270                                 || (cmd->duplex != DUPLEX_HALF
 271                                         && cmd->duplex != DUPLEX_FULL)))
 272                 return -EINVAL;
 273
 274         phydev->autoneg = cmd->autoneg;
 275
 276         phydev->speed = cmd->speed;
 277
 278         phydev->advertising = cmd->advertising;
 279
 280         if (AUTONEG_ENABLE == cmd->autoneg)
 281                 phydev->advertising |= ADVERTISED_Autoneg;
 282         else
 283                 phydev->advertising &= ~ADVERTISED_Autoneg;
 284
 285         phydev->duplex = cmd->duplex;
 286
 287         /* Restart the PHY */
 288         phy_start_aneg(phydev);
 289
 290         return 0;
 291 }
 292
 293 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 294 {
 295         cmd->supported = phydev->supported;
 296
 297         cmd->advertising = phydev->advertising;
 298
 299         cmd->speed = phydev->speed;
 300         cmd->duplex = phydev->duplex;
 301         cmd->port = PORT_MII;
 302         cmd->phy_address = phydev->addr;
 303         cmd->transceiver = XCVR_EXTERNAL;
 304         cmd->autoneg = phydev->autoneg;
 305
 306         return 0;
 307 }
 308
 309
 310 /* Note that this function is currently incompatible with the
 311  * PHYCONTROL layer.  It changes registers without regard to
 312  * current state.  Use at own risk
 313  */
 314 int phy_mii_ioctl(struct phy_device *phydev,
 315                 struct mii_ioctl_data *mii_data, int cmd)
 316 {
 317         u16 val = mii_data->val_in;
 318
 319         switch (cmd) {
 320         case SIOCGMIIPHY:
 321                 mii_data->phy_id = phydev->addr;
 322                 break;
 323         case SIOCGMIIREG:
 324                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 325                 break;
 326
 327         case SIOCSMIIREG:
 328                 if (!capable(CAP_NET_ADMIN))
 329                         return -EPERM;
 330
 331                 if (mii_data->phy_id == phydev->addr) {
 332                         switch(mii_data->reg_num) {
 333                         case MII_BMCR:
 334                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 335                                         phydev->autoneg = AUTONEG_DISABLE;
 336                                 else
 337                                         phydev->autoneg = AUTONEG_ENABLE;
 338                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 339                                         phydev->duplex = DUPLEX_FULL;
 340                                 else
 341                                         phydev->duplex = DUPLEX_HALF;
 342                                 break;
 343                         case MII_ADVERTISE:
 344                                 phydev->advertising = val;
 345                                 break;
 346                         default:
 347                                 /* do nothing */
 348                                 break;
 349                         }
 350                 }
 351
 352                 phy_write(phydev, mii_data->reg_num, val);
 353
 354                 if (mii_data->reg_num == MII_BMCR
 355                                 && val & BMCR_RESET
 356                                 && phydev->drv->config_init)
 357                         phydev->drv->config_init(phydev);
 358                 break;
 359         }
 360
 361         return 0;
 362 }
 363
 364 /* phy_start_aneg
 365  *
 366  * description: Sanitizes the settings (if we're not
 367  *   autonegotiating them), and then calls the driver's
 368  *   config_aneg function.  If the PHYCONTROL Layer is operating,
 369  *   we change the state to reflect the beginning of
 370  *   Auto-negotiation or forcing.
 371  */
 372 int phy_start_aneg(struct phy_device *phydev)
 373 {
 374         int err;
 375
 376         spin_lock(&phydev->lock);
 377
 378         if (AUTONEG_DISABLE == phydev->autoneg)
 379                 phy_sanitize_settings(phydev);
 380
 381         err = phydev->drv->config_aneg(phydev);
 382
 383 #ifdef CONFIG_PHYCONTROL
 384         if (err < 0)
 385                 goto out_unlock;
 386
 387         if (phydev->state != PHY_HALTED) {
 388                 if (AUTONEG_ENABLE == phydev->autoneg) {
 389                         phydev->state = PHY_AN;
 390                         phydev->link_timeout = PHY_AN_TIMEOUT;
 391                 } else {
 392                         phydev->state = PHY_FORCING;
 393                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 394                 }
 395         }
 396
 397 out_unlock:
 398 #endif
 399         spin_unlock(&phydev->lock);
 400         return err;
 401 }
 402 EXPORT_SYMBOL(phy_start_aneg);
 403
 404
 405 #ifdef CONFIG_PHYCONTROL
 406 static void phy_change(void *data);
 407 static void phy_timer(unsigned long data);
 408
 409 /* phy_start_machine:
 410  *
 411  * description: The PHY infrastructure can run a state machine
 412  *   which tracks whether the PHY is starting up, negotiating,
 413  *   etc.  This function starts the timer which tracks the state
 414  *   of the PHY.  If you want to be notified when the state
 415  *   changes, pass in the callback, otherwise, pass NULL.  If you
 416  *   want to maintain your own state machine, do not call this
 417  *   function. */
 418 void phy_start_machine(struct phy_device *phydev,
 419                 void (*handler)(struct net_device *))
 420 {
 421         phydev->adjust_state = handler;
 422
 423         init_timer(&phydev->phy_timer);
 424         phydev->phy_timer.function = &phy_timer;
 425         phydev->phy_timer.data = (unsigned long) phydev;
 426         mod_timer(&phydev->phy_timer, jiffies + HZ);
 427 }
 428
 429 /* phy_stop_machine
 430  *
 431  * description: Stops the state machine timer, sets the state to
 432  *   UP (unless it wasn't up yet), and then frees the interrupt,
 433  *   if it is in use. This function must be called BEFORE
 434  *   phy_detach.
 435  */
 436 void phy_stop_machine(struct phy_device *phydev)
 437 {
 438         del_timer_sync(&phydev->phy_timer);
 439
 440         spin_lock(&phydev->lock);
 441         if (phydev->state > PHY_UP)
 442                 phydev->state = PHY_UP;
 443         spin_unlock(&phydev->lock);
 444
 445         if (phydev->irq != PHY_POLL)
 446                 phy_stop_interrupts(phydev);
 447
 448         phydev->adjust_state = NULL;
 449 }
 450
 451 /* phy_force_reduction
 452  *
 453  * description: Reduces the speed/duplex settings by
 454  *   one notch.  The order is so:
 455  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
 456  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
 457  */
 458 static void phy_force_reduction(struct phy_device *phydev)
 459 {
 460         int idx;
 461
 462         idx = phy_find_setting(phydev->speed, phydev->duplex);
 463
 464         idx++;
 465
 466         idx = phy_find_valid(idx, phydev->supported);
 467
 468         phydev->speed = settings[idx].speed;
 469         phydev->duplex = settings[idx].duplex;
 470
 471         pr_info("Trying %d/%s\n", phydev->speed,
 472                         DUPLEX_FULL == phydev->duplex ?
 473                         "FULL" : "HALF");
 474 }
 475
 476
 477 /* phy_error:
 478  *
 479  * Moves the PHY to the HALTED state in response to a read
 480  * or write error, and tells the controller the link is down.
 481  * Must not be called from interrupt context, or while the
 482  * phydev->lock is held.
 483  */
 484 void phy_error(struct phy_device *phydev)
 485 {
 486         spin_lock(&phydev->lock);
 487         phydev->state = PHY_HALTED;
 488         spin_unlock(&phydev->lock);
 489 }
 490
 491 /* phy_interrupt
 492  *
 493  * description: When a PHY interrupt occurs, the handler disables
 494  * interrupts, and schedules a work task to clear the interrupt.
 495  */
 496 static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs)
 497 {
 498         struct phy_device *phydev = phy_dat;
 499
 500         /* The MDIO bus is not allowed to be written in interrupt
 501          * context, so we need to disable the irq here.  A work
 502          * queue will write the PHY to disable and clear the
 503          * interrupt, and then reenable the irq line. */
 504         disable_irq_nosync(irq);
 505
 506         schedule_work(&phydev->phy_queue);
 507
 508         return IRQ_HANDLED;
 509 }
 510
 511 /* Enable the interrupts from the PHY side */
 512 int phy_enable_interrupts(struct phy_device *phydev)
 513 {
 514         int err;
 515
 516         err = phy_clear_interrupt(phydev);
 517
 518         if (err < 0)
 519                 return err;
 520
 521         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 522
 523         return err;
 524 }
 525 EXPORT_SYMBOL(phy_enable_interrupts);
 526
 527 /* Disable the PHY interrupts from the PHY side */
 528 int phy_disable_interrupts(struct phy_device *phydev)
 529 {
 530         int err;
 531
 532         /* Disable PHY interrupts */
 533         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 534
 535         if (err)
 536                 goto phy_err;
 537
 538         /* Clear the interrupt */
 539         err = phy_clear_interrupt(phydev);
 540
 541         if (err)
 542                 goto phy_err;
 543
 544         return 0;
 545
 546 phy_err:
 547         phy_error(phydev);
 548
 549         return err;
 550 }
 551 EXPORT_SYMBOL(phy_disable_interrupts);
 552
 553 /* phy_start_interrupts
 554  *
 555  * description: Request the interrupt for the given PHY.  If
 556  *   this fails, then we set irq to PHY_POLL.
 557  *   Otherwise, we enable the interrupts in the PHY.
 558  *   Returns 0 on success.
 559  *   This should only be called with a valid IRQ number.
 560  */
 561 int phy_start_interrupts(struct phy_device *phydev)
 562 {
 563         int err = 0;
 564
 565         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
 566
 567         if (request_irq(phydev->irq, phy_interrupt,
 568                                 SA_SHIRQ,
 569                                 "phy_interrupt",
 570                                 phydev) < 0) {
 571                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 572                                 phydev->bus->name,
 573                                 phydev->irq);
 574                 phydev->irq = PHY_POLL;
 575                 return 0;
 576         }
 577
 578         err = phy_enable_interrupts(phydev);
 579
 580         return err;
 581 }
 582 EXPORT_SYMBOL(phy_start_interrupts);
 583
 584 int phy_stop_interrupts(struct phy_device *phydev)
 585 {
 586         int err;
 587
 588         err = phy_disable_interrupts(phydev);
 589
 590         if (err)
 591                 phy_error(phydev);
 592
 593         free_irq(phydev->irq, phydev);
 594
 595         return err;
 596 }
 597 EXPORT_SYMBOL(phy_stop_interrupts);
 598
 599
 600 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
 601 static void phy_change(void *data)
 602 {
 603         int err;
 604         struct phy_device *phydev = data;
 605
 606         err = phy_disable_interrupts(phydev);
 607
 608         if (err)
 609                 goto phy_err;
 610
 611         spin_lock(&phydev->lock);
 612         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 613                 phydev->state = PHY_CHANGELINK;
 614         spin_unlock(&phydev->lock);
 615
 616         enable_irq(phydev->irq);
 617
 618         /* Reenable interrupts */
 619         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 620
 621         if (err)
 622                 goto irq_enable_err;
 623
 624         return;
 625
 626 irq_enable_err:
 627         disable_irq(phydev->irq);
 628 phy_err:
 629         phy_error(phydev);
 630 }
 631
 632 /* Bring down the PHY link, and stop checking the status. */
 633 void phy_stop(struct phy_device *phydev)
 634 {
 635         spin_lock(&phydev->lock);
 636
 637         if (PHY_HALTED == phydev->state)
 638                 goto out_unlock;
 639
 640         if (phydev->irq != PHY_POLL) {
 641                 /* Clear any pending interrupts */
 642                 phy_clear_interrupt(phydev);
 643
 644                 /* Disable PHY Interrupts */
 645                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 646         }
 647
 648         phydev->state = PHY_HALTED;
 649
 650 out_unlock:
 651         spin_unlock(&phydev->lock);
 652 }
 653
 654
 655 /* phy_start
 656  *
 657  * description: Indicates the attached device's readiness to
 658  *   handle PHY-related work.  Used during startup to start the
 659  *   PHY, and after a call to phy_stop() to resume operation.
 660  *   Also used to indicate the MDIO bus has cleared an error
 661  *   condition.
 662  */
 663 void phy_start(struct phy_device *phydev)
 664 {
 665         spin_lock(&phydev->lock);
 666
 667         switch (phydev->state) {
 668                 case PHY_STARTING:
 669                         phydev->state = PHY_PENDING;
 670                         break;
 671                 case PHY_READY:
 672                         phydev->state = PHY_UP;
 673                         break;
 674                 case PHY_HALTED:
 675                         phydev->state = PHY_RESUMING;
 676                 default:
 677                         break;
 678         }
 679         spin_unlock(&phydev->lock);
 680 }
 681 EXPORT_SYMBOL(phy_stop);
 682 EXPORT_SYMBOL(phy_start);
 683
 684 /* PHY timer which handles the state machine */
 685 static void phy_timer(unsigned long data)
 686 {
 687         struct phy_device *phydev = (struct phy_device *)data;
 688         int needs_aneg = 0;
 689         int err = 0;
 690
 691         spin_lock(&phydev->lock);
 692
 693         if (phydev->adjust_state)
 694                 phydev->adjust_state(phydev->attached_dev);
 695
 696         switch(phydev->state) {
 697                 case PHY_DOWN:
 698                 case PHY_STARTING:
 699                 case PHY_READY:
 700                 case PHY_PENDING:
 701                         break;
 702                 case PHY_UP:
 703                         needs_aneg = 1;
 704
 705                         phydev->link_timeout = PHY_AN_TIMEOUT;
 706
 707                         break;
 708                 case PHY_AN:
 709                         /* Check if negotiation is done.  Break
 710                          * if there's an error */
 711                         err = phy_aneg_done(phydev);
 712                         if (err < 0)
 713                                 break;
 714
 715                         /* If auto-negotiation is done, we change to
 716                          * either RUNNING, or NOLINK */
 717                         if (err > 0) {
 718                                 err = phy_read_status(phydev);
 719
 720                                 if (err)
 721                                         break;
 722
 723                                 if (phydev->link) {
 724                                         phydev->state = PHY_RUNNING;
 725                                         netif_carrier_on(phydev->attached_dev);
 726                                 } else {
 727                                         phydev->state = PHY_NOLINK;
 728                                         netif_carrier_off(phydev->attached_dev);
 729                                 }
 730
 731                                 phydev->adjust_link(phydev->attached_dev);
 732
 733                         } else if (0 == phydev->link_timeout--) {
 734                                 /* The counter expired, so either we
 735                                  * switch to forced mode, or the
 736                                  * magic_aneg bit exists, and we try aneg
 737                                  * again */
 738                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
 739                                         int idx;
 740
 741                                         /* We'll start from the
 742                                          * fastest speed, and work
 743                                          * our way down */
 744                                         idx = phy_find_valid(0,
 745                                                         phydev->supported);
 746
 747                                         phydev->speed = settings[idx].speed;
 748                                         phydev->duplex = settings[idx].duplex;
 749
 750                                         phydev->autoneg = AUTONEG_DISABLE;
 751                                         phydev->state = PHY_FORCING;
 752                                         phydev->link_timeout =
 753                                                 PHY_FORCE_TIMEOUT;
 754
 755                                         pr_info("Trying %d/%s\n",
 756                                                         phydev->speed,
 757                                                         DUPLEX_FULL ==
 758                                                         phydev->duplex ?
 759                                                         "FULL" : "HALF");
 760                                 }
 761
 762                                 needs_aneg = 1;
 763                         }
 764                         break;
 765                 case PHY_NOLINK:
 766                         err = phy_read_status(phydev);
 767
 768                         if (err)
 769                                 break;
 770
 771                         if (phydev->link) {
 772                                 phydev->state = PHY_RUNNING;
 773                                 netif_carrier_on(phydev->attached_dev);
 774                                 phydev->adjust_link(phydev->attached_dev);
 775                         }
 776                         break;
 777                 case PHY_FORCING:
 778                         err = phy_read_status(phydev);
 779
 780                         if (err)
 781                                 break;
 782
 783                         if (phydev->link) {
 784                                 phydev->state = PHY_RUNNING;
 785                                 netif_carrier_on(phydev->attached_dev);
 786                         } else {
 787                                 if (0 == phydev->link_timeout--) {
 788                                         phy_force_reduction(phydev);
 789                                         needs_aneg = 1;
 790                                 }
 791                         }
 792
 793                         phydev->adjust_link(phydev->attached_dev);
 794                         break;
 795                 case PHY_RUNNING:
 796                         /* Only register a CHANGE if we are
 797                          * polling */
 798                         if (PHY_POLL == phydev->irq)
 799                                 phydev->state = PHY_CHANGELINK;
 800                         break;
 801                 case PHY_CHANGELINK:
 802                         err = phy_read_status(phydev);
 803
 804                         if (err)
 805                                 break;
 806
 807                         if (phydev->link) {
 808                                 phydev->state = PHY_RUNNING;
 809                                 netif_carrier_on(phydev->attached_dev);
 810                         } else {
 811                                 phydev->state = PHY_NOLINK;
 812                                 netif_carrier_off(phydev->attached_dev);
 813                         }
 814
 815                         phydev->adjust_link(phydev->attached_dev);
 816
 817                         if (PHY_POLL != phydev->irq)
 818                                 err = phy_config_interrupt(phydev,
 819                                                 PHY_INTERRUPT_ENABLED);
 820                         break;
 821                 case PHY_HALTED:
 822                         if (phydev->link) {
 823                                 phydev->link = 0;
 824                                 netif_carrier_off(phydev->attached_dev);
 825                                 phydev->adjust_link(phydev->attached_dev);
 826                         }
 827                         break;
 828                 case PHY_RESUMING:
 829
 830                         err = phy_clear_interrupt(phydev);
 831
 832                         if (err)
 833                                 break;
 834
 835                         err = phy_config_interrupt(phydev,
 836                                         PHY_INTERRUPT_ENABLED);
 837
 838                         if (err)
 839                                 break;
 840
 841                         if (AUTONEG_ENABLE == phydev->autoneg) {
 842                                 err = phy_aneg_done(phydev);
 843                                 if (err < 0)
 844                                         break;
 845
 846                                 /* err > 0 if AN is done.
 847                                  * Otherwise, it's 0, and we're
 848                                  * still waiting for AN */
 849                                 if (err > 0) {
 850                                         phydev->state = PHY_RUNNING;
 851                                 } else {
 852                                         phydev->state = PHY_AN;
 853                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 854                                 }
 855                         } else
 856                                 phydev->state = PHY_RUNNING;
 857                         break;
 858         }
 859
 860         spin_unlock(&phydev->lock);
 861
 862         if (needs_aneg)
 863                 err = phy_start_aneg(phydev);
 864
 865         if (err < 0)
 866                 phy_error(phydev);
 867
 868         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 869 }
 870
 871 #endif /* CONFIG_PHYCONTROL */