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 = AUTONEG_DISABLE;
 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)) == 0)
 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 EXPORT_SYMBOL(phy_mii_ioctl);
 413
 414 /**
 415  * phy_start_aneg - start auto-negotiation for this PHY device
 416  * @phydev: the phy_device struct
 417  *
 418  * Description: Sanitizes the settings (if we're not autonegotiating
 419  *   them), and then calls the driver's config_aneg function.
 420  *   If the PHYCONTROL Layer is operating, we change the state to
 421  *   reflect the beginning of Auto-negotiation or forcing.
 422  */
 423 int phy_start_aneg(struct phy_device *phydev)
 424 {
 425         int err;
 426
 427         spin_lock(&phydev->lock);
 428
 429         if (AUTONEG_DISABLE == phydev->autoneg)
 430                 phy_sanitize_settings(phydev);
 431
 432         err = phydev->drv->config_aneg(phydev);
 433
 434         if (err < 0)
 435                 goto out_unlock;
 436
 437         if (phydev->state != PHY_HALTED) {
 438                 if (AUTONEG_ENABLE == phydev->autoneg) {
 439                         phydev->state = PHY_AN;
 440                         phydev->link_timeout = PHY_AN_TIMEOUT;
 441                 } else {
 442                         phydev->state = PHY_FORCING;
 443                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 444                 }
 445         }
 446
 447 out_unlock:
 448         spin_unlock(&phydev->lock);
 449         return err;
 450 }
 451 EXPORT_SYMBOL(phy_start_aneg);
 452
 453
 454 static void phy_change(struct work_struct *work);
 455 static void phy_timer(unsigned long data);
 456
 457 /**
 458  * phy_start_machine - start PHY state machine tracking
 459  * @phydev: the phy_device struct
 460  * @handler: callback function for state change notifications
 461  *
 462  * Description: The PHY infrastructure can run a state machine
 463  *   which tracks whether the PHY is starting up, negotiating,
 464  *   etc.  This function starts the timer which tracks the state
 465  *   of the PHY.  If you want to be notified when the state changes,
 466  *   pass in the callback @handler, otherwise, pass NULL.  If you
 467  *   want to maintain your own state machine, do not call this
 468  *   function.
 469  */
 470 void phy_start_machine(struct phy_device *phydev,
 471                 void (*handler)(struct net_device *))
 472 {
 473         phydev->adjust_state = handler;
 474
 475         init_timer(&phydev->phy_timer);
 476         phydev->phy_timer.function = &phy_timer;
 477         phydev->phy_timer.data = (unsigned long) phydev;
 478         mod_timer(&phydev->phy_timer, jiffies + HZ);
 479 }
 480
 481 /**
 482  * phy_stop_machine - stop the PHY state machine tracking
 483  * @phydev: target phy_device struct
 484  *
 485  * Description: Stops the state machine timer, sets the state to UP
 486  *   (unless it wasn't up yet). This function must be called BEFORE
 487  *   phy_detach.
 488  */
 489 void phy_stop_machine(struct phy_device *phydev)
 490 {
 491         del_timer_sync(&phydev->phy_timer);
 492
 493         spin_lock(&phydev->lock);
 494         if (phydev->state > PHY_UP)
 495                 phydev->state = PHY_UP;
 496         spin_unlock(&phydev->lock);
 497
 498         phydev->adjust_state = NULL;
 499 }
 500
 501 /**
 502  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 503  * @phydev: target phy_device struct
 504  *
 505  * Description: Reduces the speed/duplex settings by one notch,
 506  *   in this order--
 507  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 508  *   The function bottoms out at 10/HALF.
 509  */
 510 static void phy_force_reduction(struct phy_device *phydev)
 511 {
 512         int idx;
 513
 514         idx = phy_find_setting(phydev->speed, phydev->duplex);
 515
 516         idx++;
 517
 518         idx = phy_find_valid(idx, phydev->supported);
 519
 520         phydev->speed = settings[idx].speed;
 521         phydev->duplex = settings[idx].duplex;
 522
 523         pr_info("Trying %d/%s\n", phydev->speed,
 524                         DUPLEX_FULL == phydev->duplex ?
 525                         "FULL" : "HALF");
 526 }
 527
 528
 529 /**
 530  * phy_error - enter HALTED state for this PHY device
 531  * @phydev: target phy_device struct
 532  *
 533  * Moves the PHY to the HALTED state in response to a read
 534  * or write error, and tells the controller the link is down.
 535  * Must not be called from interrupt context, or while the
 536  * phydev->lock is held.
 537  */
 538 void phy_error(struct phy_device *phydev)
 539 {
 540         spin_lock(&phydev->lock);
 541         phydev->state = PHY_HALTED;
 542         spin_unlock(&phydev->lock);
 543 }
 544
 545 /**
 546  * phy_interrupt - PHY interrupt handler
 547  * @irq: interrupt line
 548  * @phy_dat: phy_device pointer
 549  *
 550  * Description: When a PHY interrupt occurs, the handler disables
 551  * interrupts, and schedules a work task to clear the interrupt.
 552  */
 553 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 554 {
 555         struct phy_device *phydev = phy_dat;
 556
 557         if (PHY_HALTED == phydev->state)
 558                 return IRQ_NONE;                /* It can't be ours.  */
 559
 560         /* The MDIO bus is not allowed to be written in interrupt
 561          * context, so we need to disable the irq here.  A work
 562          * queue will write the PHY to disable and clear the
 563          * interrupt, and then reenable the irq line. */
 564         disable_irq_nosync(irq);
 565
 566         schedule_work(&phydev->phy_queue);
 567
 568         return IRQ_HANDLED;
 569 }
 570
 571 /**
 572  * phy_enable_interrupts - Enable the interrupts from the PHY side
 573  * @phydev: target phy_device struct
 574  */
 575 int phy_enable_interrupts(struct phy_device *phydev)
 576 {
 577         int err;
 578
 579         err = phy_clear_interrupt(phydev);
 580
 581         if (err < 0)
 582                 return err;
 583
 584         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 585
 586         return err;
 587 }
 588 EXPORT_SYMBOL(phy_enable_interrupts);
 589
 590 /**
 591  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 592  * @phydev: target phy_device struct
 593  */
 594 int phy_disable_interrupts(struct phy_device *phydev)
 595 {
 596         int err;
 597
 598         /* Disable PHY interrupts */
 599         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 600
 601         if (err)
 602                 goto phy_err;
 603
 604         /* Clear the interrupt */
 605         err = phy_clear_interrupt(phydev);
 606
 607         if (err)
 608                 goto phy_err;
 609
 610         return 0;
 611
 612 phy_err:
 613         phy_error(phydev);
 614
 615         return err;
 616 }
 617 EXPORT_SYMBOL(phy_disable_interrupts);
 618
 619 /**
 620  * phy_start_interrupts - request and enable interrupts for a PHY device
 621  * @phydev: target phy_device struct
 622  *
 623  * Description: Request the interrupt for the given PHY.
 624  *   If this fails, then we set irq to PHY_POLL.
 625  *   Otherwise, we enable the interrupts in the PHY.
 626  *   This should only be called with a valid IRQ number.
 627  *   Returns 0 on success or < 0 on error.
 628  */
 629 int phy_start_interrupts(struct phy_device *phydev)
 630 {
 631         int err = 0;
 632
 633         INIT_WORK(&phydev->phy_queue, phy_change);
 634
 635         if (request_irq(phydev->irq, phy_interrupt,
 636                                 IRQF_SHARED,
 637                                 "phy_interrupt",
 638                                 phydev) < 0) {
 639                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 640                                 phydev->bus->name,
 641                                 phydev->irq);
 642                 phydev->irq = PHY_POLL;
 643                 return 0;
 644         }
 645
 646         err = phy_enable_interrupts(phydev);
 647
 648         return err;
 649 }
 650 EXPORT_SYMBOL(phy_start_interrupts);
 651
 652 /**
 653  * phy_stop_interrupts - disable interrupts from a PHY device
 654  * @phydev: target phy_device struct
 655  */
 656 int phy_stop_interrupts(struct phy_device *phydev)
 657 {
 658         int err;
 659
 660         err = phy_disable_interrupts(phydev);
 661
 662         if (err)
 663                 phy_error(phydev);
 664
 665         /*
 666          * Finish any pending work; we might have been scheduled to be called
 667          * from keventd ourselves, but cancel_work_sync() handles that.
 668          */
 669         cancel_work_sync(&phydev->phy_queue);
 670
 671         free_irq(phydev->irq, phydev);
 672
 673         return err;
 674 }
 675 EXPORT_SYMBOL(phy_stop_interrupts);
 676
 677
 678 /**
 679  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 680  * @work: work_struct that describes the work to be done
 681  */
 682 static void phy_change(struct work_struct *work)
 683 {
 684         int err;
 685         struct phy_device *phydev =
 686                 container_of(work, struct phy_device, phy_queue);
 687
 688         err = phy_disable_interrupts(phydev);
 689
 690         if (err)
 691                 goto phy_err;
 692
 693         spin_lock(&phydev->lock);
 694         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 695                 phydev->state = PHY_CHANGELINK;
 696         spin_unlock(&phydev->lock);
 697
 698         enable_irq(phydev->irq);
 699
 700         /* Reenable interrupts */
 701         if (PHY_HALTED != phydev->state)
 702                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 703
 704         if (err)
 705                 goto irq_enable_err;
 706
 707         return;
 708
 709 irq_enable_err:
 710         disable_irq(phydev->irq);
 711 phy_err:
 712         phy_error(phydev);
 713 }
 714
 715 /**
 716  * phy_stop - Bring down the PHY link, and stop checking the status
 717  * @phydev: target phy_device struct
 718  */
 719 void phy_stop(struct phy_device *phydev)
 720 {
 721         spin_lock(&phydev->lock);
 722
 723         if (PHY_HALTED == phydev->state)
 724                 goto out_unlock;
 725
 726         phydev->state = PHY_HALTED;
 727
 728         if (phydev->irq != PHY_POLL) {
 729                 /* Disable PHY Interrupts */
 730                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 731
 732                 /* Clear any pending interrupts */
 733                 phy_clear_interrupt(phydev);
 734         }
 735
 736 out_unlock:
 737         spin_unlock(&phydev->lock);
 738
 739         /*
 740          * Cannot call flush_scheduled_work() here as desired because
 741          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 742          * will not reenable interrupts.
 743          */
 744 }
 745
 746
 747 /**
 748  * phy_start - start or restart a PHY device
 749  * @phydev: target phy_device struct
 750  *
 751  * Description: Indicates the attached device's readiness to
 752  *   handle PHY-related work.  Used during startup to start the
 753  *   PHY, and after a call to phy_stop() to resume operation.
 754  *   Also used to indicate the MDIO bus has cleared an error
 755  *   condition.
 756  */
 757 void phy_start(struct phy_device *phydev)
 758 {
 759         spin_lock_bh(&phydev->lock);
 760
 761         switch (phydev->state) {
 762                 case PHY_STARTING:
 763                         phydev->state = PHY_PENDING;
 764                         break;
 765                 case PHY_READY:
 766                         phydev->state = PHY_UP;
 767                         break;
 768                 case PHY_HALTED:
 769                         phydev->state = PHY_RESUMING;
 770                 default:
 771                         break;
 772         }
 773         spin_unlock_bh(&phydev->lock);
 774 }
 775 EXPORT_SYMBOL(phy_stop);
 776 EXPORT_SYMBOL(phy_start);
 777
 778 /* PHY timer which handles the state machine */
 779 static void phy_timer(unsigned long data)
 780 {
 781         struct phy_device *phydev = (struct phy_device *)data;
 782         int needs_aneg = 0;
 783         int err = 0;
 784
 785         spin_lock(&phydev->lock);
 786
 787         if (phydev->adjust_state)
 788                 phydev->adjust_state(phydev->attached_dev);
 789
 790         switch(phydev->state) {
 791                 case PHY_DOWN:
 792                 case PHY_STARTING:
 793                 case PHY_READY:
 794                 case PHY_PENDING:
 795                         break;
 796                 case PHY_UP:
 797                         needs_aneg = 1;
 798
 799                         phydev->link_timeout = PHY_AN_TIMEOUT;
 800
 801                         break;
 802                 case PHY_AN:
 803                         err = phy_read_status(phydev);
 804
 805                         if (err < 0)
 806                                 break;
 807
 808                         /* If the link is down, give up on
 809                          * negotiation for now */
 810                         if (!phydev->link) {
 811                                 phydev->state = PHY_NOLINK;
 812                                 netif_carrier_off(phydev->attached_dev);
 813                                 phydev->adjust_link(phydev->attached_dev);
 814                                 break;
 815                         }
 816
 817                         /* Check if negotiation is done.  Break
 818                          * if there's an error */
 819                         err = phy_aneg_done(phydev);
 820                         if (err < 0)
 821                                 break;
 822
 823                         /* If AN is done, we're running */
 824                         if (err > 0) {
 825                                 phydev->state = PHY_RUNNING;
 826                                 netif_carrier_on(phydev->attached_dev);
 827                                 phydev->adjust_link(phydev->attached_dev);
 828
 829                         } else if (0 == phydev->link_timeout--) {
 830                                 int idx;
 831
 832                                 needs_aneg = 1;
 833                                 /* If we have the magic_aneg bit,
 834                                  * we try again */
 835                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 836                                         break;
 837
 838                                 /* The timer expired, and we still
 839                                  * don't have a setting, so we try
 840                                  * forcing it until we find one that
 841                                  * works, starting from the fastest speed,
 842                                  * and working our way down */
 843                                 idx = phy_find_valid(0, phydev->supported);
 844
 845                                 phydev->speed = settings[idx].speed;
 846                                 phydev->duplex = settings[idx].duplex;
 847
 848                                 phydev->autoneg = AUTONEG_DISABLE;
 849
 850                                 pr_info("Trying %d/%s\n", phydev->speed,
 851                                                 DUPLEX_FULL ==
 852                                                 phydev->duplex ?
 853                                                 "FULL" : "HALF");
 854                         }
 855                         break;
 856                 case PHY_NOLINK:
 857                         err = phy_read_status(phydev);
 858
 859                         if (err)
 860                                 break;
 861
 862                         if (phydev->link) {
 863                                 phydev->state = PHY_RUNNING;
 864                                 netif_carrier_on(phydev->attached_dev);
 865                                 phydev->adjust_link(phydev->attached_dev);
 866                         }
 867                         break;
 868                 case PHY_FORCING:
 869                         err = genphy_update_link(phydev);
 870
 871                         if (err)
 872                                 break;
 873
 874                         if (phydev->link) {
 875                                 phydev->state = PHY_RUNNING;
 876                                 netif_carrier_on(phydev->attached_dev);
 877                         } else {
 878                                 if (0 == phydev->link_timeout--) {
 879                                         phy_force_reduction(phydev);
 880                                         needs_aneg = 1;
 881                                 }
 882                         }
 883
 884                         phydev->adjust_link(phydev->attached_dev);
 885                         break;
 886                 case PHY_RUNNING:
 887                         /* Only register a CHANGE if we are
 888                          * polling */
 889                         if (PHY_POLL == phydev->irq)
 890                                 phydev->state = PHY_CHANGELINK;
 891                         break;
 892                 case PHY_CHANGELINK:
 893                         err = phy_read_status(phydev);
 894
 895                         if (err)
 896                                 break;
 897
 898                         if (phydev->link) {
 899                                 phydev->state = PHY_RUNNING;
 900                                 netif_carrier_on(phydev->attached_dev);
 901                         } else {
 902                                 phydev->state = PHY_NOLINK;
 903                                 netif_carrier_off(phydev->attached_dev);
 904                         }
 905
 906                         phydev->adjust_link(phydev->attached_dev);
 907
 908                         if (PHY_POLL != phydev->irq)
 909                                 err = phy_config_interrupt(phydev,
 910                                                 PHY_INTERRUPT_ENABLED);
 911                         break;
 912                 case PHY_HALTED:
 913                         if (phydev->link) {
 914                                 phydev->link = 0;
 915                                 netif_carrier_off(phydev->attached_dev);
 916                                 phydev->adjust_link(phydev->attached_dev);
 917                         }
 918                         break;
 919                 case PHY_RESUMING:
 920
 921                         err = phy_clear_interrupt(phydev);
 922
 923                         if (err)
 924                                 break;
 925
 926                         err = phy_config_interrupt(phydev,
 927                                         PHY_INTERRUPT_ENABLED);
 928
 929                         if (err)
 930                                 break;
 931
 932                         if (AUTONEG_ENABLE == phydev->autoneg) {
 933                                 err = phy_aneg_done(phydev);
 934                                 if (err < 0)
 935                                         break;
 936
 937                                 /* err > 0 if AN is done.
 938                                  * Otherwise, it's 0, and we're
 939                                  * still waiting for AN */
 940                                 if (err > 0) {
 941                                         phydev->state = PHY_RUNNING;
 942                                 } else {
 943                                         phydev->state = PHY_AN;
 944                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 945                                 }
 946                         } else
 947                                 phydev->state = PHY_RUNNING;
 948                         break;
 949         }
 950
 951         spin_unlock(&phydev->lock);
 952
 953         if (needs_aneg)
 954                 err = phy_start_aneg(phydev);
 955
 956         if (err < 0)
 957                 phy_error(phydev);
 958
 959         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 960 }
 961