git.oblomov.eu Git - linux-2.6/blob - drivers/net/phy/phy.c

   1 /*
   2  * drivers/net/phy/phy.c
   3  *
   4  * Framework for configuring and reading PHY devices
   5  * Based on code in sungem_phy.c and gianfar_phy.c
   6  *
   7  * Author: Andy Fleming
   8  *
   9  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10  * 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/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 #include <linux/timer.h>
  36 #include <linux/workqueue.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/uaccess.h>
  41
  42 /**
  43  * phy_print_status - Convenience function to print out the current phy status
  44  * @phydev: the phy_device struct
  45  */
  46 void phy_print_status(struct phy_device *phydev)
  47 {
  48         pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
  49                         phydev->link ? "Up" : "Down");
  50         if (phydev->link)
  51                 printk(" - %d/%s", phydev->speed,
  52                                 DUPLEX_FULL == phydev->duplex ?
  53                                 "Full" : "Half");
  54
  55         printk("\n");
  56 }
  57 EXPORT_SYMBOL(phy_print_status);
  58
  59
  60 /**
  61  * phy_read - Convenience function for reading a given PHY register
  62  * @phydev: the phy_device struct
  63  * @regnum: register number to read
  64  *
  65  * NOTE: MUST NOT be called from interrupt context,
  66  * because the bus read/write functions may wait for an interrupt
  67  * to conclude the operation.
  68  */
  69 int phy_read(struct phy_device *phydev, u16 regnum)
  70 {
  71         int retval;
  72         struct mii_bus *bus = phydev->bus;
  73
  74         spin_lock_bh(&bus->mdio_lock);
  75         retval = bus->read(bus, phydev->addr, regnum);
  76         spin_unlock_bh(&bus->mdio_lock);
  77
  78         return retval;
  79 }
  80 EXPORT_SYMBOL(phy_read);
  81
  82 /**
  83  * phy_write - Convenience function for writing a given PHY register
  84  * @phydev: the phy_device struct
  85  * @regnum: register number to write
  86  * @val: value to write to @regnum
  87  *
  88  * NOTE: MUST NOT be called from interrupt context,
  89  * because the bus read/write functions may wait for an interrupt
  90  * to conclude the operation.
  91  */
  92 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  93 {
  94         int err;
  95         struct mii_bus *bus = phydev->bus;
  96
  97         spin_lock_bh(&bus->mdio_lock);
  98         err = bus->write(bus, phydev->addr, regnum, val);
  99         spin_unlock_bh(&bus->mdio_lock);
 100
 101         return err;
 102 }
 103 EXPORT_SYMBOL(phy_write);
 104
 105 /**
 106  * phy_clear_interrupt - Ack the phy device's interrupt
 107  * @phydev: the phy_device struct
 108  *
 109  * If the @phydev driver has an ack_interrupt function, call it to
 110  * ack and clear the phy device's interrupt.
 111  *
 112  * Returns 0 on success on < 0 on error.
 113  */
 114 int phy_clear_interrupt(struct phy_device *phydev)
 115 {
 116         int err = 0;
 117
 118         if (phydev->drv->ack_interrupt)
 119                 err = phydev->drv->ack_interrupt(phydev);
 120
 121         return err;
 122 }
 123
 124 /**
 125  * phy_config_interrupt - configure the PHY device for the requested interrupts
 126  * @phydev: the phy_device struct
 127  * @interrupts: interrupt flags to configure for this @phydev
 128  *
 129  * Returns 0 on success on < 0 on error.
 130  */
 131 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 132 {
 133         int err = 0;
 134
 135         phydev->interrupts = interrupts;
 136         if (phydev->drv->config_intr)
 137                 err = phydev->drv->config_intr(phydev);
 138
 139         return err;
 140 }
 141
 142
 143 /**
 144  * phy_aneg_done - return auto-negotiation status
 145  * @phydev: target phy_device struct
 146  *
 147  * Description: Reads the status register and returns 0 either if
 148  *   auto-negotiation is incomplete, or if there was an error.
 149  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 150  */
 151 static inline int phy_aneg_done(struct phy_device *phydev)
 152 {
 153         int retval;
 154
 155         retval = phy_read(phydev, MII_BMSR);
 156
 157         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 158 }
 159
 160 /* A structure for mapping a particular speed and duplex
 161  * combination to a particular SUPPORTED and ADVERTISED value */
 162 struct phy_setting {
 163         int speed;
 164         int duplex;
 165         u32 setting;
 166 };
 167
 168 /* A mapping of all SUPPORTED settings to speed/duplex */
 169 static const struct phy_setting settings[] = {
 170         {
 171                 .speed = 10000,
 172                 .duplex = DUPLEX_FULL,
 173                 .setting = SUPPORTED_10000baseT_Full,
 174         },
 175         {
 176                 .speed = SPEED_1000,
 177                 .duplex = DUPLEX_FULL,
 178                 .setting = SUPPORTED_1000baseT_Full,
 179         },
 180         {
 181                 .speed = SPEED_1000,
 182                 .duplex = DUPLEX_HALF,
 183                 .setting = SUPPORTED_1000baseT_Half,
 184         },
 185         {
 186                 .speed = SPEED_100,
 187                 .duplex = DUPLEX_FULL,
 188                 .setting = SUPPORTED_100baseT_Full,
 189         },
 190         {
 191                 .speed = SPEED_100,
 192                 .duplex = DUPLEX_HALF,
 193                 .setting = SUPPORTED_100baseT_Half,
 194         },
 195         {
 196                 .speed = SPEED_10,
 197                 .duplex = DUPLEX_FULL,
 198                 .setting = SUPPORTED_10baseT_Full,
 199         },
 200         {
 201                 .speed = SPEED_10,
 202                 .duplex = DUPLEX_HALF,
 203                 .setting = SUPPORTED_10baseT_Half,
 204         },
 205 };
 206
 207 #define MAX_NUM_SETTINGS (sizeof(settings)/sizeof(struct phy_setting))
 208
 209 /**
 210  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 211  * @speed: speed to match
 212  * @duplex: duplex to match
 213  *
 214  * Description: Searches the settings array for the setting which
 215  *   matches the desired speed and duplex, and returns the index
 216  *   of that setting.  Returns the index of the last setting if
 217  *   none of the others match.
 218  */
 219 static inline int phy_find_setting(int speed, int duplex)
 220 {
 221         int idx = 0;
 222
 223         while (idx < ARRAY_SIZE(settings) &&
 224                         (settings[idx].speed != speed ||
 225                         settings[idx].duplex != duplex))
 226                 idx++;
 227
 228         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 229 }
 230
 231 /**
 232  * phy_find_valid - find a PHY setting that matches the requested features mask
 233  * @idx: The first index in settings[] to search
 234  * @features: A mask of the valid settings
 235  *
 236  * Description: Returns the index of the first valid setting less
 237  *   than or equal to the one pointed to by idx, as determined by
 238  *   the mask in features.  Returns the index of the last setting
 239  *   if nothing else matches.
 240  */
 241 static inline int phy_find_valid(int idx, u32 features)
 242 {
 243         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 244                 idx++;
 245
 246         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 247 }
 248
 249 /**
 250  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 251  * @phydev: the target phy_device struct
 252  *
 253  * Description: Make sure the PHY is set to supported speeds and
 254  *   duplexes.  Drop down by one in this order:  1000/FULL,
 255  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 256  */
 257 void phy_sanitize_settings(struct phy_device *phydev)
 258 {
 259         u32 features = phydev->supported;
 260         int idx;
 261
 262         /* Sanitize settings based on PHY capabilities */
 263         if ((features & SUPPORTED_Autoneg) == 0)
 264                 phydev->autoneg = 0;
 265
 266         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 267                         features);
 268
 269         phydev->speed = settings[idx].speed;
 270         phydev->duplex = settings[idx].duplex;
 271 }
 272 EXPORT_SYMBOL(phy_sanitize_settings);
 273
 274 /**
 275  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 276  * @phydev: target phy_device struct
 277  * @cmd: ethtool_cmd
 278  *
 279  * A few notes about parameter checking:
 280  * - We don't set port or transceiver, so we don't care what they
 281  *   were set to.
 282  * - phy_start_aneg() will make sure forced settings are sane, and
 283  *   choose the next best ones from the ones selected, so we don't
 284  *   care if ethtool tries to give us bad values.
 285  */
 286 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 287 {
 288         if (cmd->phy_address != phydev->addr)
 289                 return -EINVAL;
 290
 291         /* We make sure that we don't pass unsupported
 292          * values in to the PHY */
 293         cmd->advertising &= phydev->supported;
 294
 295         /* Verify the settings we care about. */
 296         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 297                 return -EINVAL;
 298
 299         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 300                 return -EINVAL;
 301
 302         if (cmd->autoneg == AUTONEG_DISABLE
 303                         && ((cmd->speed != SPEED_1000
 304                                         && cmd->speed != SPEED_100
 305                                         && cmd->speed != SPEED_10)
 306                                 || (cmd->duplex != DUPLEX_HALF
 307                                         && cmd->duplex != DUPLEX_FULL)))
 308                 return -EINVAL;
 309
 310         phydev->autoneg = cmd->autoneg;
 311
 312         phydev->speed = cmd->speed;
 313
 314         phydev->advertising = cmd->advertising;
 315
 316         if (AUTONEG_ENABLE == cmd->autoneg)
 317                 phydev->advertising |= ADVERTISED_Autoneg;
 318         else
 319                 phydev->advertising &= ~ADVERTISED_Autoneg;
 320
 321         phydev->duplex = cmd->duplex;
 322
 323         /* Restart the PHY */
 324         phy_start_aneg(phydev);
 325
 326         return 0;
 327 }
 328 EXPORT_SYMBOL(phy_ethtool_sset);
 329
 330 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 331 {
 332         cmd->supported = phydev->supported;
 333
 334         cmd->advertising = phydev->advertising;
 335
 336         cmd->speed = phydev->speed;
 337         cmd->duplex = phydev->duplex;
 338         cmd->port = PORT_MII;
 339         cmd->phy_address = phydev->addr;
 340         cmd->transceiver = XCVR_EXTERNAL;
 341         cmd->autoneg = phydev->autoneg;
 342
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(phy_ethtool_gset);
 346
 347 /**
 348  * phy_mii_ioctl - generic PHY MII ioctl interface
 349  * @phydev: the phy_device struct
 350  * @mii_data: MII ioctl data
 351  * @cmd: ioctl cmd to execute
 352  *
 353  * Note that this function is currently incompatible with the
 354  * PHYCONTROL layer.  It changes registers without regard to
 355  * current state.  Use at own risk.
 356  */
 357 int phy_mii_ioctl(struct phy_device *phydev,
 358                 struct mii_ioctl_data *mii_data, int cmd)
 359 {
 360         u16 val = mii_data->val_in;
 361
 362         switch (cmd) {
 363         case SIOCGMIIPHY:
 364                 mii_data->phy_id = phydev->addr;
 365                 break;
 366         case SIOCGMIIREG:
 367                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 368                 break;
 369
 370         case SIOCSMIIREG:
 371                 if (!capable(CAP_NET_ADMIN))
 372                         return -EPERM;
 373
 374                 if (mii_data->phy_id == phydev->addr) {
 375                         switch(mii_data->reg_num) {
 376                         case MII_BMCR:
 377                                 if (val & (BMCR_RESET|BMCR_ANENABLE))
 378                                         phydev->autoneg = AUTONEG_DISABLE;
 379                                 else
 380                                         phydev->autoneg = AUTONEG_ENABLE;
 381                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 382                                         phydev->duplex = DUPLEX_FULL;
 383                                 else
 384                                         phydev->duplex = DUPLEX_HALF;
 385                                 if ((!phydev->autoneg) &&
 386                                                 (val & BMCR_SPEED1000))
 387                                         phydev->speed = SPEED_1000;
 388                                 else if ((!phydev->autoneg) &&
 389                                                 (val & BMCR_SPEED100))
 390                                         phydev->speed = SPEED_100;
 391                                 break;
 392                         case MII_ADVERTISE:
 393                                 phydev->advertising = val;
 394                                 break;
 395                         default:
 396                                 /* do nothing */
 397                                 break;
 398                         }
 399                 }
 400
 401                 phy_write(phydev, mii_data->reg_num, val);
 402
 403                 if (mii_data->reg_num == MII_BMCR
 404                                 && val & BMCR_RESET
 405                                 && phydev->drv->config_init)
 406                         phydev->drv->config_init(phydev);
 407                 break;
 408         }
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * phy_start_aneg - start auto-negotiation for this PHY device
 415  * @phydev: the phy_device struct
 416  *
 417  * Description: Sanitizes the settings (if we're not autonegotiating
 418  *   them), and then calls the driver's config_aneg function.
 419  *   If the PHYCONTROL Layer is operating, we change the state to
 420  *   reflect the beginning of Auto-negotiation or forcing.
 421  */
 422 int phy_start_aneg(struct phy_device *phydev)
 423 {
 424         int err;
 425
 426         spin_lock(&phydev->lock);
 427
 428         if (AUTONEG_DISABLE == phydev->autoneg)
 429                 phy_sanitize_settings(phydev);
 430
 431         err = phydev->drv->config_aneg(phydev);
 432
 433         if (err < 0)
 434                 goto out_unlock;
 435
 436         if (phydev->state != PHY_HALTED) {
 437                 if (AUTONEG_ENABLE == phydev->autoneg) {
 438                         phydev->state = PHY_AN;
 439                         phydev->link_timeout = PHY_AN_TIMEOUT;
 440                 } else {
 441                         phydev->state = PHY_FORCING;
 442                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 443                 }
 444         }
 445
 446 out_unlock:
 447         spin_unlock(&phydev->lock);
 448         return err;
 449 }
 450 EXPORT_SYMBOL(phy_start_aneg);
 451
 452
 453 static void phy_change(struct work_struct *work);
 454 static void phy_timer(unsigned long data);
 455
 456 /**
 457  * phy_start_machine - start PHY state machine tracking
 458  * @phydev: the phy_device struct
 459  * @handler: callback function for state change notifications
 460  *
 461  * Description: The PHY infrastructure can run a state machine
 462  *   which tracks whether the PHY is starting up, negotiating,
 463  *   etc.  This function starts the timer which tracks the state
 464  *   of the PHY.  If you want to be notified when the state changes,
 465  *   pass in the callback @handler, otherwise, pass NULL.  If you
 466  *   want to maintain your own state machine, do not call this
 467  *   function.
 468  */
 469 void phy_start_machine(struct phy_device *phydev,
 470                 void (*handler)(struct net_device *))
 471 {
 472         phydev->adjust_state = handler;
 473
 474         init_timer(&phydev->phy_timer);
 475         phydev->phy_timer.function = &phy_timer;
 476         phydev->phy_timer.data = (unsigned long) phydev;
 477         mod_timer(&phydev->phy_timer, jiffies + HZ);
 478 }
 479
 480 /**
 481  * phy_stop_machine - stop the PHY state machine tracking
 482  * @phydev: target phy_device struct
 483  *
 484  * Description: Stops the state machine timer, sets the state to UP
 485  *   (unless it wasn't up yet). This function must be called BEFORE
 486  *   phy_detach.
 487  */
 488 void phy_stop_machine(struct phy_device *phydev)
 489 {
 490         del_timer_sync(&phydev->phy_timer);
 491
 492         spin_lock(&phydev->lock);
 493         if (phydev->state > PHY_UP)
 494                 phydev->state = PHY_UP;
 495         spin_unlock(&phydev->lock);
 496
 497         phydev->adjust_state = NULL;
 498 }
 499
 500 /**
 501  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 502  * @phydev: target phy_device struct
 503  *
 504  * Description: Reduces the speed/duplex settings by one notch,
 505  *   in this order--
 506  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 507  *   The function bottoms out at 10/HALF.
 508  */
 509 static void phy_force_reduction(struct phy_device *phydev)
 510 {
 511         int idx;
 512
 513         idx = phy_find_setting(phydev->speed, phydev->duplex);
 514
 515         idx++;
 516
 517         idx = phy_find_valid(idx, phydev->supported);
 518
 519         phydev->speed = settings[idx].speed;
 520         phydev->duplex = settings[idx].duplex;
 521
 522         pr_info("Trying %d/%s\n", phydev->speed,
 523                         DUPLEX_FULL == phydev->duplex ?
 524                         "FULL" : "HALF");
 525 }
 526
 527
 528 /**
 529  * phy_error - enter HALTED state for this PHY device
 530  * @phydev: target phy_device struct
 531  *
 532  * Moves the PHY to the HALTED state in response to a read
 533  * or write error, and tells the controller the link is down.
 534  * Must not be called from interrupt context, or while the
 535  * phydev->lock is held.
 536  */
 537 void phy_error(struct phy_device *phydev)
 538 {
 539         spin_lock(&phydev->lock);
 540         phydev->state = PHY_HALTED;
 541         spin_unlock(&phydev->lock);
 542 }
 543
 544 /**
 545  * phy_interrupt - PHY interrupt handler
 546  * @irq: interrupt line
 547  * @phy_dat: phy_device pointer
 548  *
 549  * Description: When a PHY interrupt occurs, the handler disables
 550  * interrupts, and schedules a work task to clear the interrupt.
 551  */
 552 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 553 {
 554         struct phy_device *phydev = phy_dat;
 555
 556         if (PHY_HALTED == phydev->state)
 557                 return IRQ_NONE;                /* It can't be ours.  */
 558
 559         /* The MDIO bus is not allowed to be written in interrupt
 560          * context, so we need to disable the irq here.  A work
 561          * queue will write the PHY to disable and clear the
 562          * interrupt, and then reenable the irq line. */
 563         disable_irq_nosync(irq);
 564
 565         schedule_work(&phydev->phy_queue);
 566
 567         return IRQ_HANDLED;
 568 }
 569
 570 /**
 571  * phy_enable_interrupts - Enable the interrupts from the PHY side
 572  * @phydev: target phy_device struct
 573  */
 574 int phy_enable_interrupts(struct phy_device *phydev)
 575 {
 576         int err;
 577
 578         err = phy_clear_interrupt(phydev);
 579
 580         if (err < 0)
 581                 return err;
 582
 583         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 584
 585         return err;
 586 }
 587 EXPORT_SYMBOL(phy_enable_interrupts);
 588
 589 /**
 590  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 591  * @phydev: target phy_device struct
 592  */
 593 int phy_disable_interrupts(struct phy_device *phydev)
 594 {
 595         int err;
 596
 597         /* Disable PHY interrupts */
 598         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 599
 600         if (err)
 601                 goto phy_err;
 602
 603         /* Clear the interrupt */
 604         err = phy_clear_interrupt(phydev);
 605
 606         if (err)
 607                 goto phy_err;
 608
 609         return 0;
 610
 611 phy_err:
 612         phy_error(phydev);
 613
 614         return err;
 615 }
 616 EXPORT_SYMBOL(phy_disable_interrupts);
 617
 618 /**
 619  * phy_start_interrupts - request and enable interrupts for a PHY device
 620  * @phydev: target phy_device struct
 621  *
 622  * Description: Request the interrupt for the given PHY.
 623  *   If this fails, then we set irq to PHY_POLL.
 624  *   Otherwise, we enable the interrupts in the PHY.
 625  *   This should only be called with a valid IRQ number.
 626  *   Returns 0 on success or < 0 on error.
 627  */
 628 int phy_start_interrupts(struct phy_device *phydev)
 629 {
 630         int err = 0;
 631
 632         INIT_WORK(&phydev->phy_queue, phy_change);
 633
 634         if (request_irq(phydev->irq, phy_interrupt,
 635                                 IRQF_SHARED,
 636                                 "phy_interrupt",
 637                                 phydev) < 0) {
 638                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 639                                 phydev->bus->name,
 640                                 phydev->irq);
 641                 phydev->irq = PHY_POLL;
 642                 return 0;
 643         }
 644
 645         err = phy_enable_interrupts(phydev);
 646
 647         return err;
 648 }
 649 EXPORT_SYMBOL(phy_start_interrupts);
 650
 651 /**
 652  * phy_stop_interrupts - disable interrupts from a PHY device
 653  * @phydev: target phy_device struct
 654  */
 655 int phy_stop_interrupts(struct phy_device *phydev)
 656 {
 657         int err;
 658
 659         err = phy_disable_interrupts(phydev);
 660
 661         if (err)
 662                 phy_error(phydev);
 663
 664         /*
 665          * Finish any pending work; we might have been scheduled to be called
 666          * from keventd ourselves, but cancel_work_sync() handles that.
 667          */
 668         cancel_work_sync(&phydev->phy_queue);
 669
 670         free_irq(phydev->irq, phydev);
 671
 672         return err;
 673 }
 674 EXPORT_SYMBOL(phy_stop_interrupts);
 675
 676
 677 /**
 678  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 679  * @work: work_struct that describes the work to be done
 680  */
 681 static void phy_change(struct work_struct *work)
 682 {
 683         int err;
 684         struct phy_device *phydev =
 685                 container_of(work, struct phy_device, phy_queue);
 686
 687         err = phy_disable_interrupts(phydev);
 688
 689         if (err)
 690                 goto phy_err;
 691
 692         spin_lock(&phydev->lock);
 693         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 694                 phydev->state = PHY_CHANGELINK;
 695         spin_unlock(&phydev->lock);
 696
 697         enable_irq(phydev->irq);
 698
 699         /* Reenable interrupts */
 700         if (PHY_HALTED != phydev->state)
 701                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 702
 703         if (err)
 704                 goto irq_enable_err;
 705
 706         return;
 707
 708 irq_enable_err:
 709         disable_irq(phydev->irq);
 710 phy_err:
 711         phy_error(phydev);
 712 }
 713
 714 /**
 715  * phy_stop - Bring down the PHY link, and stop checking the status
 716  * @phydev: target phy_device struct
 717  */
 718 void phy_stop(struct phy_device *phydev)
 719 {
 720         spin_lock(&phydev->lock);
 721
 722         if (PHY_HALTED == phydev->state)
 723                 goto out_unlock;
 724
 725         phydev->state = PHY_HALTED;
 726
 727         if (phydev->irq != PHY_POLL) {
 728                 /* Disable PHY Interrupts */
 729                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 730
 731                 /* Clear any pending interrupts */
 732                 phy_clear_interrupt(phydev);
 733         }
 734
 735 out_unlock:
 736         spin_unlock(&phydev->lock);
 737
 738         /*
 739          * Cannot call flush_scheduled_work() here as desired because
 740          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 741          * will not reenable interrupts.
 742          */
 743 }
 744
 745
 746 /**
 747  * phy_start - start or restart a PHY device
 748  * @phydev: target phy_device struct
 749  *
 750  * Description: Indicates the attached device's readiness to
 751  *   handle PHY-related work.  Used during startup to start the
 752  *   PHY, and after a call to phy_stop() to resume operation.
 753  *   Also used to indicate the MDIO bus has cleared an error
 754  *   condition.
 755  */
 756 void phy_start(struct phy_device *phydev)
 757 {
 758         spin_lock(&phydev->lock);
 759
 760         switch (phydev->state) {
 761                 case PHY_STARTING:
 762                         phydev->state = PHY_PENDING;
 763                         break;
 764                 case PHY_READY:
 765                         phydev->state = PHY_UP;
 766                         break;
 767                 case PHY_HALTED:
 768                         phydev->state = PHY_RESUMING;
 769                 default:
 770                         break;
 771         }
 772         spin_unlock(&phydev->lock);
 773 }
 774 EXPORT_SYMBOL(phy_stop);
 775 EXPORT_SYMBOL(phy_start);
 776
 777 /* PHY timer which handles the state machine */
 778 static void phy_timer(unsigned long data)
 779 {
 780         struct phy_device *phydev = (struct phy_device *)data;
 781         int needs_aneg = 0;
 782         int err = 0;
 783
 784         spin_lock(&phydev->lock);
 785
 786         if (phydev->adjust_state)
 787                 phydev->adjust_state(phydev->attached_dev);
 788
 789         switch(phydev->state) {
 790                 case PHY_DOWN:
 791                 case PHY_STARTING:
 792                 case PHY_READY:
 793                 case PHY_PENDING:
 794                         break;
 795                 case PHY_UP:
 796                         needs_aneg = 1;
 797
 798                         phydev->link_timeout = PHY_AN_TIMEOUT;
 799
 800                         break;
 801                 case PHY_AN:
 802                         err = phy_read_status(phydev);
 803
 804                         if (err < 0)
 805                                 break;
 806
 807                         /* If the link is down, give up on
 808                          * negotiation for now */
 809                         if (!phydev->link) {
 810                                 phydev->state = PHY_NOLINK;
 811                                 netif_carrier_off(phydev->attached_dev);
 812                                 phydev->adjust_link(phydev->attached_dev);
 813                                 break;
 814                         }
 815
 816                         /* Check if negotiation is done.  Break
 817                          * if there's an error */
 818                         err = phy_aneg_done(phydev);
 819                         if (err < 0)
 820                                 break;
 821
 822                         /* If AN is done, we're running */
 823                         if (err > 0) {
 824                                 phydev->state = PHY_RUNNING;
 825                                 netif_carrier_on(phydev->attached_dev);
 826                                 phydev->adjust_link(phydev->attached_dev);
 827
 828                         } else if (0 == phydev->link_timeout--) {
 829                                 int idx;
 830
 831                                 needs_aneg = 1;
 832                                 /* If we have the magic_aneg bit,
 833                                  * we try again */
 834                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 835                                         break;
 836
 837                                 /* The timer expired, and we still
 838                                  * don't have a setting, so we try
 839                                  * forcing it until we find one that
 840                                  * works, starting from the fastest speed,
 841                                  * and working our way down */
 842                                 idx = phy_find_valid(0, phydev->supported);
 843
 844                                 phydev->speed = settings[idx].speed;
 845                                 phydev->duplex = settings[idx].duplex;
 846
 847                                 phydev->autoneg = AUTONEG_DISABLE;
 848
 849                                 pr_info("Trying %d/%s\n", phydev->speed,
 850                                                 DUPLEX_FULL ==
 851                                                 phydev->duplex ?
 852                                                 "FULL" : "HALF");
 853                         }
 854                         break;
 855                 case PHY_NOLINK:
 856                         err = phy_read_status(phydev);
 857
 858                         if (err)
 859                                 break;
 860
 861                         if (phydev->link) {
 862                                 phydev->state = PHY_RUNNING;
 863                                 netif_carrier_on(phydev->attached_dev);
 864                                 phydev->adjust_link(phydev->attached_dev);
 865                         }
 866                         break;
 867                 case PHY_FORCING:
 868                         err = genphy_update_link(phydev);
 869
 870                         if (err)
 871                                 break;
 872
 873                         if (phydev->link) {
 874                                 phydev->state = PHY_RUNNING;
 875                                 netif_carrier_on(phydev->attached_dev);
 876                         } else {
 877                                 if (0 == phydev->link_timeout--) {
 878                                         phy_force_reduction(phydev);
 879                                         needs_aneg = 1;
 880                                 }
 881                         }
 882
 883                         phydev->adjust_link(phydev->attached_dev);
 884                         break;
 885                 case PHY_RUNNING:
 886                         /* Only register a CHANGE if we are
 887                          * polling */
 888                         if (PHY_POLL == phydev->irq)
 889                                 phydev->state = PHY_CHANGELINK;
 890                         break;
 891                 case PHY_CHANGELINK:
 892                         err = phy_read_status(phydev);
 893
 894                         if (err)
 895                                 break;
 896
 897                         if (phydev->link) {
 898                                 phydev->state = PHY_RUNNING;
 899                                 netif_carrier_on(phydev->attached_dev);
 900                         } else {
 901                                 phydev->state = PHY_NOLINK;
 902                                 netif_carrier_off(phydev->attached_dev);
 903                         }
 904
 905                         phydev->adjust_link(phydev->attached_dev);
 906
 907                         if (PHY_POLL != phydev->irq)
 908                                 err = phy_config_interrupt(phydev,
 909                                                 PHY_INTERRUPT_ENABLED);
 910                         break;
 911                 case PHY_HALTED:
 912                         if (phydev->link) {
 913                                 phydev->link = 0;
 914                                 netif_carrier_off(phydev->attached_dev);
 915                                 phydev->adjust_link(phydev->attached_dev);
 916                         }
 917                         break;
 918                 case PHY_RESUMING:
 919
 920                         err = phy_clear_interrupt(phydev);
 921
 922                         if (err)
 923                                 break;
 924
 925                         err = phy_config_interrupt(phydev,
 926                                         PHY_INTERRUPT_ENABLED);
 927
 928                         if (err)
 929                                 break;
 930
 931                         if (AUTONEG_ENABLE == phydev->autoneg) {
 932                                 err = phy_aneg_done(phydev);
 933                                 if (err < 0)
 934                                         break;
 935
 936                                 /* err > 0 if AN is done.
 937                                  * Otherwise, it's 0, and we're
 938                                  * still waiting for AN */
 939                                 if (err > 0) {
 940                                         phydev->state = PHY_RUNNING;
 941                                 } else {
 942                                         phydev->state = PHY_AN;
 943                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 944                                 }
 945                         } else
 946                                 phydev->state = PHY_RUNNING;
 947                         break;
 948         }
 949
 950         spin_unlock(&phydev->lock);
 951
 952         if (needs_aneg)
 953                 err = phy_start_aneg(phydev);
 954
 955         if (err < 0)
 956                 phy_error(phydev);
 957
 958         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 959 }
 960