drivers/net/phy/phy.c.orig

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