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  * Copyright (c) 2006  Maciej W. Rozycki
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  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/mii.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/phy.h>
  36 #include <linux/timer.h>
  37 #include <linux/workqueue.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/uaccess.h>
  42
  43 /* Convenience function to print out the current phy status
  44  */
  45 void phy_print_status(struct phy_device *phydev)
  46 {
  47         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
  48                         phydev->link ? "Up" : "Down");
  49         if (phydev->link)
  50                 printk(" - %d/%s", phydev->speed,
  51                                 DUPLEX_FULL == phydev->duplex ?
  52                                 "Full" : "Half");
  53
  54         printk("\n");
  55 }
  56 EXPORT_SYMBOL(phy_print_status);
  57
  58
  59 /* Convenience functions for reading/writing a given PHY
  60  * register. They MUST NOT be called from interrupt context,
  61  * because the bus read/write functions may wait for an interrupt
  62  * to conclude the operation. */
  63 int phy_read(struct phy_device *phydev, u16 regnum)
  64 {
  65         int retval;
  66         struct mii_bus *bus = phydev->bus;
  67
  68         spin_lock_bh(&bus->mdio_lock);
  69         retval = bus->read(bus, phydev->addr, regnum);
  70         spin_unlock_bh(&bus->mdio_lock);
  71
  72         return retval;
  73 }
  74 EXPORT_SYMBOL(phy_read);
  75
  76 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  77 {
  78         int err;
  79         struct mii_bus *bus = phydev->bus;
  80
  81         spin_lock_bh(&bus->mdio_lock);
  82         err = bus->write(bus, phydev->addr, regnum, val);
  83         spin_unlock_bh(&bus->mdio_lock);
  84
  85         return err;
  86 }
  87 EXPORT_SYMBOL(phy_write);
  88
  89
  90 int phy_clear_interrupt(struct phy_device *phydev)
  91 {
  92         int err = 0;
  93
  94         if (phydev->drv->ack_interrupt)
  95                 err = phydev->drv->ack_interrupt(phydev);
  96
  97         return err;
  98 }
  99
 100
 101 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 102 {
 103         int err = 0;
 104
 105         phydev->interrupts = interrupts;
 106         if (phydev->drv->config_intr)
 107                 err = phydev->drv->config_intr(phydev);
 108
 109         return err;
 110 }
 111
 112
 113 /* phy_aneg_done
 114  *
 115  * description: Reads the status register and returns 0 either if
 116  *   auto-negotiation is incomplete, or if there was an error.
 117  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 118  */
 119 static inline int phy_aneg_done(struct phy_device *phydev)
 120 {
 121         int retval;
 122
 123         retval = phy_read(phydev, MII_BMSR);
 124
 125         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 126 }
 127
 128 /* A structure for mapping a particular speed and duplex
 129  * combination to a particular SUPPORTED and ADVERTISED value */
 130 struct phy_setting {
 131         int speed;
 132         int duplex;
 133         u32 setting;
 134 };
 135
 136 /* A mapping of all SUPPORTED settings to speed/duplex */
 137 static const struct phy_setting settings[] = {
 138         {
 139                 .speed = 10000,
 140                 .duplex = DUPLEX_FULL,
 141                 .setting = SUPPORTED_10000baseT_Full,
 142         },
 143         {
 144                 .speed = SPEED_1000,
 145                 .duplex = DUPLEX_FULL,
 146                 .setting = SUPPORTED_1000baseT_Full,
 147         },
 148         {
 149                 .speed = SPEED_1000,
 150                 .duplex = DUPLEX_HALF,
 151                 .setting = SUPPORTED_1000baseT_Half,
 152         },
 153         {
 154                 .speed = SPEED_100,
 155                 .duplex = DUPLEX_FULL,
 156                 .setting = SUPPORTED_100baseT_Full,
 157         },
 158         {
 159                 .speed = SPEED_100,
 160                 .duplex = DUPLEX_HALF,
 161                 .setting = SUPPORTED_100baseT_Half,
 162         },
 163         {
 164                 .speed = SPEED_10,
 165                 .duplex = DUPLEX_FULL,
 166                 .setting = SUPPORTED_10baseT_Full,
 167         },
 168         {
 169                 .speed = SPEED_10,
 170                 .duplex = DUPLEX_HALF,
 171                 .setting = SUPPORTED_10baseT_Half,
 172         },
 173 };
 174
 175 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 176
 177 /* phy_find_setting
 178  *
 179  * description: Searches the settings array for the setting which
 180  *   matches the desired speed and duplex, and returns the index
 181  *   of that setting.  Returns the index of the last setting if
 182  *   none of the others match.
 183  */
 184 static inline int phy_find_setting(int speed, int duplex)
 185 {
 186         int idx = 0;
 187
 188         while (idx < ARRAY_SIZE(settings) &&
 189                         (settings[idx].speed != speed ||
 190                         settings[idx].duplex != duplex))
 191                 idx++;
 192
 193         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 194 }
 195
 196 /* phy_find_valid
 197  * idx: The first index in settings[] to search
 198  * features: A mask of the valid settings
 199  *
 200  * description: Returns the index of the first valid setting less
 201  *   than or equal to the one pointed to by idx, as determined by
 202  *   the mask in features.  Returns the index of the last setting
 203  *   if nothing else matches.
 204  */
 205 static inline int phy_find_valid(int idx, u32 features)
 206 {
 207         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 208                 idx++;
 209
 210         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 211 }
 212
 213 /* phy_sanitize_settings
 214  *
 215  * description: Make sure the PHY is set to supported speeds and
 216  *   duplexes.  Drop down by one in this order:  1000/FULL,
 217  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF
 218  */
 219 void phy_sanitize_settings(struct phy_device *phydev)
 220 {
 221         u32 features = phydev->supported;
 222         int idx;
 223
 224         /* Sanitize settings based on PHY capabilities */
 225         if ((features & SUPPORTED_Autoneg) == 0)
 226                 phydev->autoneg = 0;
 227
 228         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 229                         features);
 230
 231         phydev->speed = settings[idx].speed;
 232         phydev->duplex = settings[idx].duplex;
 233 }
 234 EXPORT_SYMBOL(phy_sanitize_settings);
 235
 236 /* phy_ethtool_sset:
 237  * A generic ethtool sset function.  Handles all the details
 238  *
 239  * A few notes about parameter checking:
 240  * - We don't set port or transceiver, so we don't care what they
 241  *   were set to.
 242  * - phy_start_aneg() will make sure forced settings are sane, and
 243  *   choose the next best ones from the ones selected, so we don't
 244  *   care if ethtool tries to give us bad values
 245  *
 246  */
 247 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 248 {
 249         if (cmd->phy_address != phydev->addr)
 250                 return -EINVAL;
 251
 252         /* We make sure that we don't pass unsupported
 253          * values in to the PHY */
 254         cmd->advertising &= phydev->supported;
 255
 256         /* Verify the settings we care about. */
 257         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 258                 return -EINVAL;
 259
 260         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 261                 return -EINVAL;
 262
 263         if (cmd->autoneg == AUTONEG_DISABLE
 264                         && ((cmd->speed != SPEED_1000
 265                                         && cmd->speed != SPEED_100
 266                                         && cmd->speed != SPEED_10)
 267                                 || (cmd->duplex != DUPLEX_HALF
 268                                         && cmd->duplex != DUPLEX_FULL)))
 269                 return -EINVAL;
 270
 271         phydev->autoneg = cmd->autoneg;
 272
 273         phydev->speed = cmd->speed;
 274
 275         phydev->advertising = cmd->advertising;
 276
 277         if (AUTONEG_ENABLE == cmd->autoneg)
 278                 phydev->advertising |= ADVERTISED_Autoneg;
 279         else
 280                 phydev->advertising &= ~ADVERTISED_Autoneg;
 281
 282         phydev->duplex = cmd->duplex;
 283
 284         /* Restart the PHY */
 285         phy_start_aneg(phydev);
 286
 287         return 0;
 288 }
 289 EXPORT_SYMBOL(phy_ethtool_sset);
 290
 291 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 292 {
 293         cmd->supported = phydev->supported;
 294
 295         cmd->advertising = phydev->advertising;
 296
 297         cmd->speed = phydev->speed;
 298         cmd->duplex = phydev->duplex;
 299         cmd->port = PORT_MII;
 300         cmd->phy_address = phydev->addr;
 301         cmd->transceiver = XCVR_EXTERNAL;
 302         cmd->autoneg = phydev->autoneg;
 303
 304         return 0;
 305 }
 306 EXPORT_SYMBOL(phy_ethtool_gset);
 307
 308 /* Note that this function is currently incompatible with the
 309  * PHYCONTROL layer.  It changes registers without regard to
 310  * current state.  Use at own risk
 311  */
 312 int phy_mii_ioctl(struct phy_device *phydev,
 313                 struct mii_ioctl_data *mii_data, int cmd)
 314 {
 315         u16 val = mii_data->val_in;
 316
 317         switch (cmd) {
 318         case SIOCGMIIPHY:
 319                 mii_data->phy_id = phydev->addr;
 320                 break;
 321         case SIOCGMIIREG:
 322                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 323                 break;
 324
 325         case SIOCSMIIREG:
 326                 if (!capable(CAP_NET_ADMIN))
 327                         return -EPERM;
 328
 329                 if (mii_data->phy_id == phydev->addr) {
 330                         switch(mii_data->reg_num) {
 331                         case MII_BMCR:
 332                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 333                                         phydev->autoneg = AUTONEG_DISABLE;
 334                                 else
 335                                         phydev->autoneg = AUTONEG_ENABLE;
 336                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 337                                         phydev->duplex = DUPLEX_FULL;
 338                                 else
 339                                         phydev->duplex = DUPLEX_HALF;
 340                                 break;
 341                         case MII_ADVERTISE:
 342                                 phydev->advertising = val;
 343                                 break;
 344                         default:
 345                                 /* do nothing */
 346                                 break;
 347                         }
 348                 }
 349
 350                 phy_write(phydev, mii_data->reg_num, val);
 351
 352                 if (mii_data->reg_num == MII_BMCR
 353                                 && val & BMCR_RESET
 354                                 && phydev->drv->config_init)
 355                         phydev->drv->config_init(phydev);
 356                 break;
 357         }
 358
 359         return 0;
 360 }
 361
 362 /* phy_start_aneg
 363  *
 364  * description: Sanitizes the settings (if we're not
 365  *   autonegotiating them), and then calls the driver's
 366  *   config_aneg function.  If the PHYCONTROL Layer is operating,
 367  *   we change the state to reflect the beginning of
 368  *   Auto-negotiation or forcing.
 369  */
 370 int phy_start_aneg(struct phy_device *phydev)
 371 {
 372         int err;
 373
 374         spin_lock(&phydev->lock);
 375
 376         if (AUTONEG_DISABLE == phydev->autoneg)
 377                 phy_sanitize_settings(phydev);
 378
 379         err = phydev->drv->config_aneg(phydev);
 380
 381         if (err < 0)
 382                 goto out_unlock;
 383
 384         if (phydev->state != PHY_HALTED) {
 385                 if (AUTONEG_ENABLE == phydev->autoneg) {
 386                         phydev->state = PHY_AN;
 387                         phydev->link_timeout = PHY_AN_TIMEOUT;
 388                 } else {
 389                         phydev->state = PHY_FORCING;
 390                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 391                 }
 392         }
 393
 394 out_unlock:
 395         spin_unlock(&phydev->lock);
 396         return err;
 397 }
 398 EXPORT_SYMBOL(phy_start_aneg);
 399
 400
 401 static void phy_change(struct work_struct *work);
 402 static void phy_timer(unsigned long data);
 403
 404 /* phy_start_machine:
 405  *
 406  * description: The PHY infrastructure can run a state machine
 407  *   which tracks whether the PHY is starting up, negotiating,
 408  *   etc.  This function starts the timer which tracks the state
 409  *   of the PHY.  If you want to be notified when the state
 410  *   changes, pass in the callback, otherwise, pass NULL.  If you
 411  *   want to maintain your own state machine, do not call this
 412  *   function. */
 413 void phy_start_machine(struct phy_device *phydev,
 414                 void (*handler)(struct net_device *))
 415 {
 416         phydev->adjust_state = handler;
 417
 418         init_timer(&phydev->phy_timer);
 419         phydev->phy_timer.function = &phy_timer;
 420         phydev->phy_timer.data = (unsigned long) phydev;
 421         mod_timer(&phydev->phy_timer, jiffies + HZ);
 422 }
 423
 424 /* phy_stop_machine
 425  *
 426  * description: Stops the state machine timer, sets the state to UP
 427  *   (unless it wasn't up yet). This function must be called BEFORE
 428  *   phy_detach.
 429  */
 430 void phy_stop_machine(struct phy_device *phydev)
 431 {
 432         del_timer_sync(&phydev->phy_timer);
 433
 434         spin_lock(&phydev->lock);
 435         if (phydev->state > PHY_UP)
 436                 phydev->state = PHY_UP;
 437         spin_unlock(&phydev->lock);
 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)
 488 {
 489         struct phy_device *phydev = phy_dat;
 490
 491         if (PHY_HALTED == phydev->state)
 492                 return IRQ_NONE;                /* It can't be ours.  */
 493
 494         /* The MDIO bus is not allowed to be written in interrupt
 495          * context, so we need to disable the irq here.  A work
 496          * queue will write the PHY to disable and clear the
 497          * interrupt, and then reenable the irq line. */
 498         disable_irq_nosync(irq);
 499
 500         schedule_work(&phydev->phy_queue);
 501
 502         return IRQ_HANDLED;
 503 }
 504
 505 /* Enable the interrupts from the PHY side */
 506 int phy_enable_interrupts(struct phy_device *phydev)
 507 {
 508         int err;
 509
 510         err = phy_clear_interrupt(phydev);
 511
 512         if (err < 0)
 513                 return err;
 514
 515         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 516
 517         return err;
 518 }
 519 EXPORT_SYMBOL(phy_enable_interrupts);
 520
 521 /* Disable the PHY interrupts from the PHY side */
 522 int phy_disable_interrupts(struct phy_device *phydev)
 523 {
 524         int err;
 525
 526         /* Disable PHY interrupts */
 527         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 528
 529         if (err)
 530                 goto phy_err;
 531
 532         /* Clear the interrupt */
 533         err = phy_clear_interrupt(phydev);
 534
 535         if (err)
 536                 goto phy_err;
 537
 538         return 0;
 539
 540 phy_err:
 541         phy_error(phydev);
 542
 543         return err;
 544 }
 545 EXPORT_SYMBOL(phy_disable_interrupts);
 546
 547 /* phy_start_interrupts
 548  *
 549  * description: Request the interrupt for the given PHY.  If
 550  *   this fails, then we set irq to PHY_POLL.
 551  *   Otherwise, we enable the interrupts in the PHY.
 552  *   Returns 0 on success.
 553  *   This should only be called with a valid IRQ number.
 554  */
 555 int phy_start_interrupts(struct phy_device *phydev)
 556 {
 557         int err = 0;
 558
 559         INIT_WORK(&phydev->phy_queue, phy_change);
 560
 561         if (request_irq(phydev->irq, phy_interrupt,
 562                                 IRQF_SHARED,
 563                                 "phy_interrupt",
 564                                 phydev) < 0) {
 565                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 566                                 phydev->bus->name,
 567                                 phydev->irq);
 568                 phydev->irq = PHY_POLL;
 569                 return 0;
 570         }
 571
 572         err = phy_enable_interrupts(phydev);
 573
 574         return err;
 575 }
 576 EXPORT_SYMBOL(phy_start_interrupts);
 577
 578 int phy_stop_interrupts(struct phy_device *phydev)
 579 {
 580         int err;
 581
 582         err = phy_disable_interrupts(phydev);
 583
 584         if (err)
 585                 phy_error(phydev);
 586
 587         /*
 588          * Finish any pending work; we might have been scheduled
 589          * to be called from keventd ourselves, though.
 590          */
 591         run_scheduled_work(&phydev->phy_queue);
 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(struct work_struct *work)
 602 {
 603         int err;
 604         struct phy_device *phydev =
 605                 container_of(work, struct phy_device, phy_queue);
 606
 607         err = phy_disable_interrupts(phydev);
 608
 609         if (err)
 610                 goto phy_err;
 611
 612         spin_lock(&phydev->lock);
 613         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 614                 phydev->state = PHY_CHANGELINK;
 615         spin_unlock(&phydev->lock);
 616
 617         enable_irq(phydev->irq);
 618
 619         /* Reenable interrupts */
 620         if (PHY_HALTED != phydev->state)
 621                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 622
 623         if (err)
 624                 goto irq_enable_err;
 625
 626         return;
 627
 628 irq_enable_err:
 629         disable_irq(phydev->irq);
 630 phy_err:
 631         phy_error(phydev);
 632 }
 633
 634 /* Bring down the PHY link, and stop checking the status. */
 635 void phy_stop(struct phy_device *phydev)
 636 {
 637         spin_lock(&phydev->lock);
 638
 639         if (PHY_HALTED == phydev->state)
 640                 goto out_unlock;
 641
 642         phydev->state = PHY_HALTED;
 643
 644         if (phydev->irq != PHY_POLL) {
 645                 /* Disable PHY Interrupts */
 646                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 647
 648                 /* Clear any pending interrupts */
 649                 phy_clear_interrupt(phydev);
 650         }
 651
 652 out_unlock:
 653         spin_unlock(&phydev->lock);
 654
 655         /*
 656          * Cannot call flush_scheduled_work() here as desired because
 657          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 658          * will not reenable interrupts.
 659          */
 660 }
 661
 662
 663 /* phy_start
 664  *
 665  * description: Indicates the attached device's readiness to
 666  *   handle PHY-related work.  Used during startup to start the
 667  *   PHY, and after a call to phy_stop() to resume operation.
 668  *   Also used to indicate the MDIO bus has cleared an error
 669  *   condition.
 670  */
 671 void phy_start(struct phy_device *phydev)
 672 {
 673         spin_lock(&phydev->lock);
 674
 675         switch (phydev->state) {
 676                 case PHY_STARTING:
 677                         phydev->state = PHY_PENDING;
 678                         break;
 679                 case PHY_READY:
 680                         phydev->state = PHY_UP;
 681                         break;
 682                 case PHY_HALTED:
 683                         phydev->state = PHY_RESUMING;
 684                 default:
 685                         break;
 686         }
 687         spin_unlock(&phydev->lock);
 688 }
 689 EXPORT_SYMBOL(phy_stop);
 690 EXPORT_SYMBOL(phy_start);
 691
 692 /* PHY timer which handles the state machine */
 693 static void phy_timer(unsigned long data)
 694 {
 695         struct phy_device *phydev = (struct phy_device *)data;
 696         int needs_aneg = 0;
 697         int err = 0;
 698
 699         spin_lock(&phydev->lock);
 700
 701         if (phydev->adjust_state)
 702                 phydev->adjust_state(phydev->attached_dev);
 703
 704         switch(phydev->state) {
 705                 case PHY_DOWN:
 706                 case PHY_STARTING:
 707                 case PHY_READY:
 708                 case PHY_PENDING:
 709                         break;
 710                 case PHY_UP:
 711                         needs_aneg = 1;
 712
 713                         phydev->link_timeout = PHY_AN_TIMEOUT;
 714
 715                         break;
 716                 case PHY_AN:
 717                         err = phy_read_status(phydev);
 718
 719                         if (err < 0)
 720                                 break;
 721
 722                         /* If the link is down, give up on
 723                          * negotiation for now */
 724                         if (!phydev->link) {
 725                                 phydev->state = PHY_NOLINK;
 726                                 netif_carrier_off(phydev->attached_dev);
 727                                 phydev->adjust_link(phydev->attached_dev);
 728                                 break;
 729                         }
 730
 731                         /* Check if negotiation is done.  Break
 732                          * if there's an error */
 733                         err = phy_aneg_done(phydev);
 734                         if (err < 0)
 735                                 break;
 736
 737                         /* If AN is done, we're running */
 738                         if (err > 0) {
 739                                 phydev->state = PHY_RUNNING;
 740                                 netif_carrier_on(phydev->attached_dev);
 741                                 phydev->adjust_link(phydev->attached_dev);
 742
 743                         } else if (0 == phydev->link_timeout--) {
 744                                 int idx;
 745
 746                                 needs_aneg = 1;
 747                                 /* If we have the magic_aneg bit,
 748                                  * we try again */
 749                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 750                                         break;
 751
 752                                 /* The timer expired, and we still
 753                                  * don't have a setting, so we try
 754                                  * forcing it until we find one that
 755                                  * works, starting from the fastest speed,
 756                                  * and working our way down */
 757                                 idx = phy_find_valid(0, phydev->supported);
 758
 759                                 phydev->speed = settings[idx].speed;
 760                                 phydev->duplex = settings[idx].duplex;
 761
 762                                 phydev->autoneg = AUTONEG_DISABLE;
 763
 764                                 pr_info("Trying %d/%s\n", phydev->speed,
 765                                                 DUPLEX_FULL ==
 766                                                 phydev->duplex ?
 767                                                 "FULL" : "HALF");
 768                         }
 769                         break;
 770                 case PHY_NOLINK:
 771                         err = phy_read_status(phydev);
 772
 773                         if (err)
 774                                 break;
 775
 776                         if (phydev->link) {
 777                                 phydev->state = PHY_RUNNING;
 778                                 netif_carrier_on(phydev->attached_dev);
 779                                 phydev->adjust_link(phydev->attached_dev);
 780                         }
 781                         break;
 782                 case PHY_FORCING:
 783                         err = genphy_update_link(phydev);
 784
 785                         if (err)
 786                                 break;
 787
 788                         if (phydev->link) {
 789                                 phydev->state = PHY_RUNNING;
 790                                 netif_carrier_on(phydev->attached_dev);
 791                         } else {
 792                                 if (0 == phydev->link_timeout--) {
 793                                         phy_force_reduction(phydev);
 794                                         needs_aneg = 1;
 795                                 }
 796                         }
 797
 798                         phydev->adjust_link(phydev->attached_dev);
 799                         break;
 800                 case PHY_RUNNING:
 801                         /* Only register a CHANGE if we are
 802                          * polling */
 803                         if (PHY_POLL == phydev->irq)
 804                                 phydev->state = PHY_CHANGELINK;
 805                         break;
 806                 case PHY_CHANGELINK:
 807                         err = phy_read_status(phydev);
 808
 809                         if (err)
 810                                 break;
 811
 812                         if (phydev->link) {
 813                                 phydev->state = PHY_RUNNING;
 814                                 netif_carrier_on(phydev->attached_dev);
 815                         } else {
 816                                 phydev->state = PHY_NOLINK;
 817                                 netif_carrier_off(phydev->attached_dev);
 818                         }
 819
 820                         phydev->adjust_link(phydev->attached_dev);
 821
 822                         if (PHY_POLL != phydev->irq)
 823                                 err = phy_config_interrupt(phydev,
 824                                                 PHY_INTERRUPT_ENABLED);
 825                         break;
 826                 case PHY_HALTED:
 827                         if (phydev->link) {
 828                                 phydev->link = 0;
 829                                 netif_carrier_off(phydev->attached_dev);
 830                                 phydev->adjust_link(phydev->attached_dev);
 831                         }
 832                         break;
 833                 case PHY_RESUMING:
 834
 835                         err = phy_clear_interrupt(phydev);
 836
 837                         if (err)
 838                                 break;
 839
 840                         err = phy_config_interrupt(phydev,
 841                                         PHY_INTERRUPT_ENABLED);
 842
 843                         if (err)
 844                                 break;
 845
 846                         if (AUTONEG_ENABLE == phydev->autoneg) {
 847                                 err = phy_aneg_done(phydev);
 848                                 if (err < 0)
 849                                         break;
 850
 851                                 /* err > 0 if AN is done.
 852                                  * Otherwise, it's 0, and we're
 853                                  * still waiting for AN */
 854                                 if (err > 0) {
 855                                         phydev->state = PHY_RUNNING;
 856                                 } else {
 857                                         phydev->state = PHY_AN;
 858                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 859                                 }
 860                         } else
 861                                 phydev->state = PHY_RUNNING;
 862                         break;
 863         }
 864
 865         spin_unlock(&phydev->lock);
 866
 867         if (needs_aneg)
 868                 err = phy_start_aneg(phydev);
 869
 870         if (err < 0)
 871                 phy_error(phydev);
 872
 873         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 874 }
 875