drivers/net/phy/phy.c

   1 /*
   2  * drivers/net/phy/phy.c
   3  *
   4  * Framework for configuring and reading PHY devices
   5  * Based on code in sungem_phy.c and gianfar_phy.c
   6  *
   7  * Author: Andy Fleming
   8  *
   9  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/string.h>
  20 #include <linux/errno.h>
  21 #include <linux/unistd.h>
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/mm.h>
  31 #include <linux/module.h>
  32 #include <linux/mii.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/phy.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/uaccess.h>
  39
  40 /* Convenience function to print out the current phy status
  41  */
  42 void phy_print_status(struct phy_device *phydev)
  43 {
  44         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
  45                         phydev->link ? "Up" : "Down");
  46         if (phydev->link)
  47                 printk(" - %d/%s", phydev->speed,
  48                                 DUPLEX_FULL == phydev->duplex ?
  49                                 "Full" : "Half");
  50
  51         printk("\n");
  52 }
  53 EXPORT_SYMBOL(phy_print_status);
  54
  55
  56 /* Convenience functions for reading/writing a given PHY
  57  * register. They MUST NOT be called from interrupt context,
  58  * because the bus read/write functions may wait for an interrupt
  59  * to conclude the operation. */
  60 int phy_read(struct phy_device *phydev, u16 regnum)
  61 {
  62         int retval;
  63         struct mii_bus *bus = phydev->bus;
  64
  65         spin_lock_bh(&bus->mdio_lock);
  66         retval = bus->read(bus, phydev->addr, regnum);
  67         spin_unlock_bh(&bus->mdio_lock);
  68
  69         return retval;
  70 }
  71 EXPORT_SYMBOL(phy_read);
  72
  73 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  74 {
  75         int err;
  76         struct mii_bus *bus = phydev->bus;
  77
  78         spin_lock_bh(&bus->mdio_lock);
  79         err = bus->write(bus, phydev->addr, regnum, val);
  80         spin_unlock_bh(&bus->mdio_lock);
  81
  82         return err;
  83 }
  84 EXPORT_SYMBOL(phy_write);
  85
  86
  87 int phy_clear_interrupt(struct phy_device *phydev)
  88 {
  89         int err = 0;
  90
  91         if (phydev->drv->ack_interrupt)
  92                 err = phydev->drv->ack_interrupt(phydev);
  93
  94         return err;
  95 }
  96
  97
  98 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
  99 {
 100         int err = 0;
 101
 102         phydev->interrupts = interrupts;
 103         if (phydev->drv->config_intr)
 104                 err = phydev->drv->config_intr(phydev);
 105
 106         return err;
 107 }
 108
 109
 110 /* phy_aneg_done
 111  *
 112  * description: Reads the status register and returns 0 either if
 113  *   auto-negotiation is incomplete, or if there was an error.
 114  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 115  */
 116 static inline int phy_aneg_done(struct phy_device *phydev)
 117 {
 118         int retval;
 119
 120         retval = phy_read(phydev, MII_BMSR);
 121
 122         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 123 }
 124
 125 /* A structure for mapping a particular speed and duplex
 126  * combination to a particular SUPPORTED and ADVERTISED value */
 127 struct phy_setting {
 128         int speed;
 129         int duplex;
 130         u32 setting;
 131 };
 132
 133 /* A mapping of all SUPPORTED settings to speed/duplex */
 134 static const struct phy_setting settings[] = {
 135         {
 136                 .speed = 10000,
 137                 .duplex = DUPLEX_FULL,
 138                 .setting = SUPPORTED_10000baseT_Full,
 139         },
 140         {
 141                 .speed = SPEED_1000,
 142                 .duplex = DUPLEX_FULL,
 143                 .setting = SUPPORTED_1000baseT_Full,
 144         },
 145         {
 146                 .speed = SPEED_1000,
 147                 .duplex = DUPLEX_HALF,
 148                 .setting = SUPPORTED_1000baseT_Half,
 149         },
 150         {
 151                 .speed = SPEED_100,
 152                 .duplex = DUPLEX_FULL,
 153                 .setting = SUPPORTED_100baseT_Full,
 154         },
 155         {
 156                 .speed = SPEED_100,
 157                 .duplex = DUPLEX_HALF,
 158                 .setting = SUPPORTED_100baseT_Half,
 159         },
 160         {
 161                 .speed = SPEED_10,
 162                 .duplex = DUPLEX_FULL,
 163                 .setting = SUPPORTED_10baseT_Full,
 164         },
 165         {
 166                 .speed = SPEED_10,
 167                 .duplex = DUPLEX_HALF,
 168                 .setting = SUPPORTED_10baseT_Half,
 169         },
 170 };
 171
 172 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 173
 174 /* phy_find_setting
 175  *
 176  * description: Searches the settings array for the setting which
 177  *   matches the desired speed and duplex, and returns the index
 178  *   of that setting.  Returns the index of the last setting if
 179  *   none of the others match.
 180  */
 181 static inline int phy_find_setting(int speed, int duplex)
 182 {
 183         int idx = 0;
 184
 185         while (idx < ARRAY_SIZE(settings) &&
 186                         (settings[idx].speed != speed ||
 187                         settings[idx].duplex != duplex))
 188                 idx++;
 189
 190         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 191 }
 192
 193 /* phy_find_valid
 194  * idx: The first index in settings[] to search
 195  * features: A mask of the valid settings
 196  *
 197  * description: Returns the index of the first valid setting less
 198  *   than or equal to the one pointed to by idx, as determined by
 199  *   the mask in features.  Returns the index of the last setting
 200  *   if nothing else matches.
 201  */
 202 static inline int phy_find_valid(int idx, u32 features)
 203 {
 204         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 205                 idx++;
 206
 207         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 208 }
 209
 210 /* phy_sanitize_settings
 211  *
 212  * description: Make sure the PHY is set to supported speeds and
 213  *   duplexes.  Drop down by one in this order:  1000/FULL,
 214  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
 215  */
 216 void phy_sanitize_settings(struct phy_device *phydev)
 217 {
 218         u32 features = phydev->supported;
 219         int idx;
 220
 221         /* Sanitize settings based on PHY capabilities */
 222         if ((features & SUPPORTED_Autoneg) == 0)
 223                 phydev->autoneg = 0;
 224
 225         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 226                         features);
 227
 228         phydev->speed = settings[idx].speed;
 229         phydev->duplex = settings[idx].duplex;
 230 }
 231 EXPORT_SYMBOL(phy_sanitize_settings);
 232
 233 /* phy_ethtool_sset:
 234  * A generic ethtool sset function.  Handles all the details
 235  *
 236  * A few notes about parameter checking:
 237  * - We don't set port or transceiver, so we don't care what they
 238  *   were set to.
 239  * - phy_start_aneg() will make sure forced settings are sane, and
 240  *   choose the next best ones from the ones selected, so we don't
 241  *   care if ethtool tries to give us bad values
 242  *
 243  */
 244 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 245 {
 246         if (cmd->phy_address != phydev->addr)
 247                 return -EINVAL;
 248
 249         /* We make sure that we don't pass unsupported
 250          * values in to the PHY */
 251         cmd->advertising &= phydev->supported;
 252
 253         /* Verify the settings we care about. */
 254         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 255                 return -EINVAL;
 256
 257         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 258                 return -EINVAL;
 259
 260         if (cmd->autoneg == AUTONEG_DISABLE
 261                         && ((cmd->speed != SPEED_1000
 262                                         && cmd->speed != SPEED_100
 263                                         && cmd->speed != SPEED_10)
 264                                 || (cmd->duplex != DUPLEX_HALF
 265                                         && cmd->duplex != DUPLEX_FULL)))
 266                 return -EINVAL;
 267
 268         phydev->autoneg = cmd->autoneg;
 269
 270         phydev->speed = cmd->speed;
 271
 272         phydev->advertising = cmd->advertising;
 273
 274         if (AUTONEG_ENABLE == cmd->autoneg)
 275                 phydev->advertising |= ADVERTISED_Autoneg;
 276         else
 277                 phydev->advertising &= ~ADVERTISED_Autoneg;
 278
 279         phydev->duplex = cmd->duplex;
 280
 281         /* Restart the PHY */
 282         phy_start_aneg(phydev);
 283
 284         return 0;
 285 }
 286
 287 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 288 {
 289         cmd->supported = phydev->supported;
 290
 291         cmd->advertising = phydev->advertising;
 292
 293         cmd->speed = phydev->speed;
 294         cmd->duplex = phydev->duplex;
 295         cmd->port = PORT_MII;
 296         cmd->phy_address = phydev->addr;
 297         cmd->transceiver = XCVR_EXTERNAL;
 298         cmd->autoneg = phydev->autoneg;
 299
 300         return 0;
 301 }
 302
 303
 304 /* Note that this function is currently incompatible with the
 305  * PHYCONTROL layer.  It changes registers without regard to
 306  * current state.  Use at own risk
 307  */
 308 int phy_mii_ioctl(struct phy_device *phydev,
 309                 struct mii_ioctl_data *mii_data, int cmd)
 310 {
 311         u16 val = mii_data->val_in;
 312
 313         switch (cmd) {
 314         case SIOCGMIIPHY:
 315                 mii_data->phy_id = phydev->addr;
 316                 break;
 317         case SIOCGMIIREG:
 318                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 319                 break;
 320
 321         case SIOCSMIIREG:
 322                 if (!capable(CAP_NET_ADMIN))
 323                         return -EPERM;
 324
 325                 if (mii_data->phy_id == phydev->addr) {
 326                         switch(mii_data->reg_num) {
 327                         case MII_BMCR:
 328                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 329                                         phydev->autoneg = AUTONEG_DISABLE;
 330                                 else
 331                                         phydev->autoneg = AUTONEG_ENABLE;
 332                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 333                                         phydev->duplex = DUPLEX_FULL;
 334                                 else
 335                                         phydev->duplex = DUPLEX_HALF;
 336                                 break;
 337                         case MII_ADVERTISE:
 338                                 phydev->advertising = val;
 339                                 break;
 340                         default:
 341                                 /* do nothing */
 342                                 break;
 343                         }
 344                 }
 345
 346                 phy_write(phydev, mii_data->reg_num, val);
 347
 348                 if (mii_data->reg_num == MII_BMCR
 349                                 && val & BMCR_RESET
 350                                 && phydev->drv->config_init)
 351                         phydev->drv->config_init(phydev);
 352                 break;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /* phy_start_aneg
 359  *
 360  * description: Sanitizes the settings (if we're not
 361  *   autonegotiating them), and then calls the driver's
 362  *   config_aneg function.  If the PHYCONTROL Layer is operating,
 363  *   we change the state to reflect the beginning of
 364  *   Auto-negotiation or forcing.
 365  */
 366 int phy_start_aneg(struct phy_device *phydev)
 367 {
 368         int err;
 369
 370         spin_lock(&phydev->lock);
 371
 372         if (AUTONEG_DISABLE == phydev->autoneg)
 373                 phy_sanitize_settings(phydev);
 374
 375         err = phydev->drv->config_aneg(phydev);
 376
 377         if (err < 0)
 378                 goto out_unlock;
 379
 380         if (phydev->state != PHY_HALTED) {
 381                 if (AUTONEG_ENABLE == phydev->autoneg) {
 382                         phydev->state = PHY_AN;
 383                         phydev->link_timeout = PHY_AN_TIMEOUT;
 384                 } else {
 385                         phydev->state = PHY_FORCING;
 386                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 387                 }
 388         }
 389
 390 out_unlock:
 391         spin_unlock(&phydev->lock);
 392         return err;
 393 }
 394 EXPORT_SYMBOL(phy_start_aneg);
 395
 396
 397 static void phy_change(void *data);
 398 static void phy_timer(unsigned long data);
 399
 400 /* phy_start_machine:
 401  *
 402  * description: The PHY infrastructure can run a state machine
 403  *   which tracks whether the PHY is starting up, negotiating,
 404  *   etc.  This function starts the timer which tracks the state
 405  *   of the PHY.  If you want to be notified when the state
 406  *   changes, pass in the callback, otherwise, pass NULL.  If you
 407  *   want to maintain your own state machine, do not call this
 408  *   function. */
 409 void phy_start_machine(struct phy_device *phydev,
 410                 void (*handler)(struct net_device *))
 411 {
 412         phydev->adjust_state = handler;
 413
 414         init_timer(&phydev->phy_timer);
 415         phydev->phy_timer.function = &phy_timer;
 416         phydev->phy_timer.data = (unsigned long) phydev;
 417         mod_timer(&phydev->phy_timer, jiffies + HZ);
 418 }
 419
 420 /* phy_stop_machine
 421  *
 422  * description: Stops the state machine timer, sets the state to
 423  *   UP (unless it wasn't up yet), and then frees the interrupt,
 424  *   if it is in use. This function must be called BEFORE
 425  *   phy_detach.
 426  */
 427 void phy_stop_machine(struct phy_device *phydev)
 428 {
 429         del_timer_sync(&phydev->phy_timer);
 430
 431         spin_lock(&phydev->lock);
 432         if (phydev->state > PHY_UP)
 433                 phydev->state = PHY_UP;
 434         spin_unlock(&phydev->lock);
 435
 436         if (phydev->irq != PHY_POLL)
 437                 phy_stop_interrupts(phydev);
 438
 439         phydev->adjust_state = NULL;
 440 }
 441
 442 /* phy_force_reduction
 443  *
 444  * description: Reduces the speed/duplex settings by
 445  *   one notch.  The order is so:
 446  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF,
 447  *   10/FULL, 10/HALF.  The function bottoms out at 10/HALF.
 448  */
 449 static void phy_force_reduction(struct phy_device *phydev)
 450 {
 451         int idx;
 452
 453         idx = phy_find_setting(phydev->speed, phydev->duplex);
 454
 455         idx++;
 456
 457         idx = phy_find_valid(idx, phydev->supported);
 458
 459         phydev->speed = settings[idx].speed;
 460         phydev->duplex = settings[idx].duplex;
 461
 462         pr_info("Trying %d/%s\n", phydev->speed,
 463                         DUPLEX_FULL == phydev->duplex ?
 464                         "FULL" : "HALF");
 465 }
 466
 467
 468 /* phy_error:
 469  *
 470  * Moves the PHY to the HALTED state in response to a read
 471  * or write error, and tells the controller the link is down.
 472  * Must not be called from interrupt context, or while the
 473  * phydev->lock is held.
 474  */
 475 void phy_error(struct phy_device *phydev)
 476 {
 477         spin_lock(&phydev->lock);
 478         phydev->state = PHY_HALTED;
 479         spin_unlock(&phydev->lock);
 480 }
 481
 482 /* phy_interrupt
 483  *
 484  * description: When a PHY interrupt occurs, the handler disables
 485  * interrupts, and schedules a work task to clear the interrupt.
 486  */
 487 static irqreturn_t phy_interrupt(int irq, void *phy_dat, struct pt_regs *regs)
 488 {
 489         struct phy_device *phydev = phy_dat;
 490
 491         /* The MDIO bus is not allowed to be written in interrupt
 492          * context, so we need to disable the irq here.  A work
 493          * queue will write the PHY to disable and clear the
 494          * interrupt, and then reenable the irq line. */
 495         disable_irq_nosync(irq);
 496
 497         schedule_work(&phydev->phy_queue);
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 /* Enable the interrupts from the PHY side */
 503 int phy_enable_interrupts(struct phy_device *phydev)
 504 {
 505         int err;
 506
 507         err = phy_clear_interrupt(phydev);
 508
 509         if (err < 0)
 510                 return err;
 511
 512         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 513
 514         return err;
 515 }
 516 EXPORT_SYMBOL(phy_enable_interrupts);
 517
 518 /* Disable the PHY interrupts from the PHY side */
 519 int phy_disable_interrupts(struct phy_device *phydev)
 520 {
 521         int err;
 522
 523         /* Disable PHY interrupts */
 524         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 525
 526         if (err)
 527                 goto phy_err;
 528
 529         /* Clear the interrupt */
 530         err = phy_clear_interrupt(phydev);
 531
 532         if (err)
 533                 goto phy_err;
 534
 535         return 0;
 536
 537 phy_err:
 538         phy_error(phydev);
 539
 540         return err;
 541 }
 542 EXPORT_SYMBOL(phy_disable_interrupts);
 543
 544 /* phy_start_interrupts
 545  *
 546  * description: Request the interrupt for the given PHY.  If
 547  *   this fails, then we set irq to PHY_POLL.
 548  *   Otherwise, we enable the interrupts in the PHY.
 549  *   Returns 0 on success.
 550  *   This should only be called with a valid IRQ number.
 551  */
 552 int phy_start_interrupts(struct phy_device *phydev)
 553 {
 554         int err = 0;
 555
 556         INIT_WORK(&phydev->phy_queue, phy_change, phydev);
 557
 558         if (request_irq(phydev->irq, phy_interrupt,
 559                                 IRQF_SHARED,
 560                                 "phy_interrupt",
 561                                 phydev) < 0) {
 562                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 563                                 phydev->bus->name,
 564                                 phydev->irq);
 565                 phydev->irq = PHY_POLL;
 566                 return 0;
 567         }
 568
 569         err = phy_enable_interrupts(phydev);
 570
 571         return err;
 572 }
 573 EXPORT_SYMBOL(phy_start_interrupts);
 574
 575 int phy_stop_interrupts(struct phy_device *phydev)
 576 {
 577         int err;
 578
 579         err = phy_disable_interrupts(phydev);
 580
 581         if (err)
 582                 phy_error(phydev);
 583
 584         free_irq(phydev->irq, phydev);
 585
 586         return err;
 587 }
 588 EXPORT_SYMBOL(phy_stop_interrupts);
 589
 590
 591 /* Scheduled by the phy_interrupt/timer to handle PHY changes */
 592 static void phy_change(void *data)
 593 {
 594         int err;
 595         struct phy_device *phydev = data;
 596
 597         err = phy_disable_interrupts(phydev);
 598
 599         if (err)
 600                 goto phy_err;
 601
 602         spin_lock(&phydev->lock);
 603         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 604                 phydev->state = PHY_CHANGELINK;
 605         spin_unlock(&phydev->lock);
 606
 607         enable_irq(phydev->irq);
 608
 609         /* Reenable interrupts */
 610         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 611
 612         if (err)
 613                 goto irq_enable_err;
 614
 615         return;
 616
 617 irq_enable_err:
 618         disable_irq(phydev->irq);
 619 phy_err:
 620         phy_error(phydev);
 621 }
 622
 623 /* Bring down the PHY link, and stop checking the status. */
 624 void phy_stop(struct phy_device *phydev)
 625 {
 626         spin_lock(&phydev->lock);
 627
 628         if (PHY_HALTED == phydev->state)
 629                 goto out_unlock;
 630
 631         if (phydev->irq != PHY_POLL) {
 632                 /* Clear any pending interrupts */
 633                 phy_clear_interrupt(phydev);
 634
 635                 /* Disable PHY Interrupts */
 636                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 637         }
 638
 639         phydev->state = PHY_HALTED;
 640
 641 out_unlock:
 642         spin_unlock(&phydev->lock);
 643 }
 644
 645
 646 /* phy_start
 647  *
 648  * description: Indicates the attached device's readiness to
 649  *   handle PHY-related work.  Used during startup to start the
 650  *   PHY, and after a call to phy_stop() to resume operation.
 651  *   Also used to indicate the MDIO bus has cleared an error
 652  *   condition.
 653  */
 654 void phy_start(struct phy_device *phydev)
 655 {
 656         spin_lock(&phydev->lock);
 657
 658         switch (phydev->state) {
 659                 case PHY_STARTING:
 660                         phydev->state = PHY_PENDING;
 661                         break;
 662                 case PHY_READY:
 663                         phydev->state = PHY_UP;
 664                         break;
 665                 case PHY_HALTED:
 666                         phydev->state = PHY_RESUMING;
 667                 default:
 668                         break;
 669         }
 670         spin_unlock(&phydev->lock);
 671 }
 672 EXPORT_SYMBOL(phy_stop);
 673 EXPORT_SYMBOL(phy_start);
 674
 675 /* PHY timer which handles the state machine */
 676 static void phy_timer(unsigned long data)
 677 {
 678         struct phy_device *phydev = (struct phy_device *)data;
 679         int needs_aneg = 0;
 680         int err = 0;
 681
 682         spin_lock(&phydev->lock);
 683
 684         if (phydev->adjust_state)
 685                 phydev->adjust_state(phydev->attached_dev);
 686
 687         switch(phydev->state) {
 688                 case PHY_DOWN:
 689                 case PHY_STARTING:
 690                 case PHY_READY:
 691                 case PHY_PENDING:
 692                         break;
 693                 case PHY_UP:
 694                         needs_aneg = 1;
 695
 696                         phydev->link_timeout = PHY_AN_TIMEOUT;
 697
 698                         break;
 699                 case PHY_AN:
 700                         /* Check if negotiation is done.  Break
 701                          * if there's an error */
 702                         err = phy_aneg_done(phydev);
 703                         if (err < 0)
 704                                 break;
 705
 706                         /* If auto-negotiation is done, we change to
 707                          * either RUNNING, or NOLINK */
 708                         if (err > 0) {
 709                                 err = phy_read_status(phydev);
 710
 711                                 if (err)
 712                                         break;
 713
 714                                 if (phydev->link) {
 715                                         phydev->state = PHY_RUNNING;
 716                                         netif_carrier_on(phydev->attached_dev);
 717                                 } else {
 718                                         phydev->state = PHY_NOLINK;
 719                                         netif_carrier_off(phydev->attached_dev);
 720                                 }
 721
 722                                 phydev->adjust_link(phydev->attached_dev);
 723
 724                         } else if (0 == phydev->link_timeout--) {
 725                                 /* The counter expired, so either we
 726                                  * switch to forced mode, or the
 727                                  * magic_aneg bit exists, and we try aneg
 728                                  * again */
 729                                 if (!(phydev->drv->flags & PHY_HAS_MAGICANEG)) {
 730                                         int idx;
 731
 732                                         /* We'll start from the
 733                                          * fastest speed, and work
 734                                          * our way down */
 735                                         idx = phy_find_valid(0,
 736                                                         phydev->supported);
 737
 738                                         phydev->speed = settings[idx].speed;
 739                                         phydev->duplex = settings[idx].duplex;
 740
 741                                         phydev->autoneg = AUTONEG_DISABLE;
 742                                         phydev->state = PHY_FORCING;
 743                                         phydev->link_timeout =
 744                                                 PHY_FORCE_TIMEOUT;
 745
 746                                         pr_info("Trying %d/%s\n",
 747                                                         phydev->speed,
 748                                                         DUPLEX_FULL ==
 749                                                         phydev->duplex ?
 750                                                         "FULL" : "HALF");
 751                                 }
 752
 753                                 needs_aneg = 1;
 754                         }
 755                         break;
 756                 case PHY_NOLINK:
 757                         err = phy_read_status(phydev);
 758
 759                         if (err)
 760                                 break;
 761
 762                         if (phydev->link) {
 763                                 phydev->state = PHY_RUNNING;
 764                                 netif_carrier_on(phydev->attached_dev);
 765                                 phydev->adjust_link(phydev->attached_dev);
 766                         }
 767                         break;
 768                 case PHY_FORCING:
 769                         err = phy_read_status(phydev);
 770
 771                         if (err)
 772                                 break;
 773
 774                         if (phydev->link) {
 775                                 phydev->state = PHY_RUNNING;
 776                                 netif_carrier_on(phydev->attached_dev);
 777                         } else {
 778                                 if (0 == phydev->link_timeout--) {
 779                                         phy_force_reduction(phydev);
 780                                         needs_aneg = 1;
 781                                 }
 782                         }
 783
 784                         phydev->adjust_link(phydev->attached_dev);
 785                         break;
 786                 case PHY_RUNNING:
 787                         /* Only register a CHANGE if we are
 788                          * polling */
 789                         if (PHY_POLL == phydev->irq)
 790                                 phydev->state = PHY_CHANGELINK;
 791                         break;
 792                 case PHY_CHANGELINK:
 793                         err = phy_read_status(phydev);
 794
 795                         if (err)
 796                                 break;
 797
 798                         if (phydev->link) {
 799                                 phydev->state = PHY_RUNNING;
 800                                 netif_carrier_on(phydev->attached_dev);
 801                         } else {
 802                                 phydev->state = PHY_NOLINK;
 803                                 netif_carrier_off(phydev->attached_dev);
 804                         }
 805
 806                         phydev->adjust_link(phydev->attached_dev);
 807
 808                         if (PHY_POLL != phydev->irq)
 809                                 err = phy_config_interrupt(phydev,
 810                                                 PHY_INTERRUPT_ENABLED);
 811                         break;
 812                 case PHY_HALTED:
 813                         if (phydev->link) {
 814                                 phydev->link = 0;
 815                                 netif_carrier_off(phydev->attached_dev);
 816                                 phydev->adjust_link(phydev->attached_dev);
 817                         }
 818                         break;
 819                 case PHY_RESUMING:
 820
 821                         err = phy_clear_interrupt(phydev);
 822
 823                         if (err)
 824                                 break;
 825
 826                         err = phy_config_interrupt(phydev,
 827                                         PHY_INTERRUPT_ENABLED);
 828
 829                         if (err)
 830                                 break;
 831
 832                         if (AUTONEG_ENABLE == phydev->autoneg) {
 833                                 err = phy_aneg_done(phydev);
 834                                 if (err < 0)
 835                                         break;
 836
 837                                 /* err > 0 if AN is done.
 838                                  * Otherwise, it's 0, and we're
 839                                  * still waiting for AN */
 840                                 if (err > 0) {
 841                                         phydev->state = PHY_RUNNING;
 842                                 } else {
 843                                         phydev->state = PHY_AN;
 844                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 845                                 }
 846                         } else
 847                                 phydev->state = PHY_RUNNING;
 848                         break;
 849         }
 850
 851         spin_unlock(&phydev->lock);
 852
 853         if (needs_aneg)
 854                 err = phy_start_aneg(phydev);
 855
 856         if (err < 0)
 857                 phy_error(phydev);
 858
 859         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 860 }
 861