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                                 break;
 386                         case MII_ADVERTISE:
 387                                 phydev->advertising = val;
 388                                 break;
 389                         default:
 390                                 /* do nothing */
 391                                 break;
 392                         }
 393                 }
 394
 395                 phy_write(phydev, mii_data->reg_num, val);
 396
 397                 if (mii_data->reg_num == MII_BMCR
 398                                 && val & BMCR_RESET
 399                                 && phydev->drv->config_init)
 400                         phydev->drv->config_init(phydev);
 401                 break;
 402         }
 403
 404         return 0;
 405 }
 406
 407 /**
 408  * phy_start_aneg - start auto-negotiation for this PHY device
 409  * @phydev: the phy_device struct
 410  *
 411  * Description: Sanitizes the settings (if we're not autonegotiating
 412  *   them), and then calls the driver's config_aneg function.
 413  *   If the PHYCONTROL Layer is operating, we change the state to
 414  *   reflect the beginning of Auto-negotiation or forcing.
 415  */
 416 int phy_start_aneg(struct phy_device *phydev)
 417 {
 418         int err;
 419
 420         spin_lock(&phydev->lock);
 421
 422         if (AUTONEG_DISABLE == phydev->autoneg)
 423                 phy_sanitize_settings(phydev);
 424
 425         err = phydev->drv->config_aneg(phydev);
 426
 427         if (err < 0)
 428                 goto out_unlock;
 429
 430         if (phydev->state != PHY_HALTED) {
 431                 if (AUTONEG_ENABLE == phydev->autoneg) {
 432                         phydev->state = PHY_AN;
 433                         phydev->link_timeout = PHY_AN_TIMEOUT;
 434                 } else {
 435                         phydev->state = PHY_FORCING;
 436                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 437                 }
 438         }
 439
 440 out_unlock:
 441         spin_unlock(&phydev->lock);
 442         return err;
 443 }
 444 EXPORT_SYMBOL(phy_start_aneg);
 445
 446
 447 static void phy_change(struct work_struct *work);
 448 static void phy_timer(unsigned long data);
 449
 450 /**
 451  * phy_start_machine - start PHY state machine tracking
 452  * @phydev: the phy_device struct
 453  * @handler: callback function for state change notifications
 454  *
 455  * Description: The PHY infrastructure can run a state machine
 456  *   which tracks whether the PHY is starting up, negotiating,
 457  *   etc.  This function starts the timer which tracks the state
 458  *   of the PHY.  If you want to be notified when the state changes,
 459  *   pass in the callback @handler, otherwise, pass NULL.  If you
 460  *   want to maintain your own state machine, do not call this
 461  *   function.
 462  */
 463 void phy_start_machine(struct phy_device *phydev,
 464                 void (*handler)(struct net_device *))
 465 {
 466         phydev->adjust_state = handler;
 467
 468         init_timer(&phydev->phy_timer);
 469         phydev->phy_timer.function = &phy_timer;
 470         phydev->phy_timer.data = (unsigned long) phydev;
 471         mod_timer(&phydev->phy_timer, jiffies + HZ);
 472 }
 473
 474 /**
 475  * phy_stop_machine - stop the PHY state machine tracking
 476  * @phydev: target phy_device struct
 477  *
 478  * Description: Stops the state machine timer, sets the state to UP
 479  *   (unless it wasn't up yet). This function must be called BEFORE
 480  *   phy_detach.
 481  */
 482 void phy_stop_machine(struct phy_device *phydev)
 483 {
 484         del_timer_sync(&phydev->phy_timer);
 485
 486         spin_lock(&phydev->lock);
 487         if (phydev->state > PHY_UP)
 488                 phydev->state = PHY_UP;
 489         spin_unlock(&phydev->lock);
 490
 491         phydev->adjust_state = NULL;
 492 }
 493
 494 /**
 495  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 496  * @phydev: target phy_device struct
 497  *
 498  * Description: Reduces the speed/duplex settings by one notch,
 499  *   in this order--
 500  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 501  *   The function bottoms out at 10/HALF.
 502  */
 503 static void phy_force_reduction(struct phy_device *phydev)
 504 {
 505         int idx;
 506
 507         idx = phy_find_setting(phydev->speed, phydev->duplex);
 508
 509         idx++;
 510
 511         idx = phy_find_valid(idx, phydev->supported);
 512
 513         phydev->speed = settings[idx].speed;
 514         phydev->duplex = settings[idx].duplex;
 515
 516         pr_info("Trying %d/%s\n", phydev->speed,
 517                         DUPLEX_FULL == phydev->duplex ?
 518                         "FULL" : "HALF");
 519 }
 520
 521
 522 /**
 523  * phy_error - enter HALTED state for this PHY device
 524  * @phydev: target phy_device struct
 525  *
 526  * Moves the PHY to the HALTED state in response to a read
 527  * or write error, and tells the controller the link is down.
 528  * Must not be called from interrupt context, or while the
 529  * phydev->lock is held.
 530  */
 531 void phy_error(struct phy_device *phydev)
 532 {
 533         spin_lock(&phydev->lock);
 534         phydev->state = PHY_HALTED;
 535         spin_unlock(&phydev->lock);
 536 }
 537
 538 /**
 539  * phy_interrupt - PHY interrupt handler
 540  * @irq: interrupt line
 541  * @phy_dat: phy_device pointer
 542  *
 543  * Description: When a PHY interrupt occurs, the handler disables
 544  * interrupts, and schedules a work task to clear the interrupt.
 545  */
 546 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 547 {
 548         struct phy_device *phydev = phy_dat;
 549
 550         if (PHY_HALTED == phydev->state)
 551                 return IRQ_NONE;                /* It can't be ours.  */
 552
 553         /* The MDIO bus is not allowed to be written in interrupt
 554          * context, so we need to disable the irq here.  A work
 555          * queue will write the PHY to disable and clear the
 556          * interrupt, and then reenable the irq line. */
 557         disable_irq_nosync(irq);
 558
 559         schedule_work(&phydev->phy_queue);
 560
 561         return IRQ_HANDLED;
 562 }
 563
 564 /**
 565  * phy_enable_interrupts - Enable the interrupts from the PHY side
 566  * @phydev: target phy_device struct
 567  */
 568 int phy_enable_interrupts(struct phy_device *phydev)
 569 {
 570         int err;
 571
 572         err = phy_clear_interrupt(phydev);
 573
 574         if (err < 0)
 575                 return err;
 576
 577         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 578
 579         return err;
 580 }
 581 EXPORT_SYMBOL(phy_enable_interrupts);
 582
 583 /**
 584  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 585  * @phydev: target phy_device struct
 586  */
 587 int phy_disable_interrupts(struct phy_device *phydev)
 588 {
 589         int err;
 590
 591         /* Disable PHY interrupts */
 592         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 593
 594         if (err)
 595                 goto phy_err;
 596
 597         /* Clear the interrupt */
 598         err = phy_clear_interrupt(phydev);
 599
 600         if (err)
 601                 goto phy_err;
 602
 603         return 0;
 604
 605 phy_err:
 606         phy_error(phydev);
 607
 608         return err;
 609 }
 610 EXPORT_SYMBOL(phy_disable_interrupts);
 611
 612 /**
 613  * phy_start_interrupts - request and enable interrupts for a PHY device
 614  * @phydev: target phy_device struct
 615  *
 616  * Description: Request the interrupt for the given PHY.
 617  *   If this fails, then we set irq to PHY_POLL.
 618  *   Otherwise, we enable the interrupts in the PHY.
 619  *   This should only be called with a valid IRQ number.
 620  *   Returns 0 on success or < 0 on error.
 621  */
 622 int phy_start_interrupts(struct phy_device *phydev)
 623 {
 624         int err = 0;
 625
 626         INIT_WORK(&phydev->phy_queue, phy_change);
 627
 628         if (request_irq(phydev->irq, phy_interrupt,
 629                                 IRQF_SHARED,
 630                                 "phy_interrupt",
 631                                 phydev) < 0) {
 632                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 633                                 phydev->bus->name,
 634                                 phydev->irq);
 635                 phydev->irq = PHY_POLL;
 636                 return 0;
 637         }
 638
 639         err = phy_enable_interrupts(phydev);
 640
 641         return err;
 642 }
 643 EXPORT_SYMBOL(phy_start_interrupts);
 644
 645 /**
 646  * phy_stop_interrupts - disable interrupts from a PHY device
 647  * @phydev: target phy_device struct
 648  */
 649 int phy_stop_interrupts(struct phy_device *phydev)
 650 {
 651         int err;
 652
 653         err = phy_disable_interrupts(phydev);
 654
 655         if (err)
 656                 phy_error(phydev);
 657
 658         /*
 659          * Finish any pending work; we might have been scheduled
 660          * to be called from keventd ourselves, though.
 661          */
 662         run_scheduled_work(&phydev->phy_queue);
 663
 664         free_irq(phydev->irq, phydev);
 665
 666         return err;
 667 }
 668 EXPORT_SYMBOL(phy_stop_interrupts);
 669
 670
 671 /**
 672  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 673  * @work: work_struct that describes the work to be done
 674  */
 675 static void phy_change(struct work_struct *work)
 676 {
 677         int err;
 678         struct phy_device *phydev =
 679                 container_of(work, struct phy_device, phy_queue);
 680
 681         err = phy_disable_interrupts(phydev);
 682
 683         if (err)
 684                 goto phy_err;
 685
 686         spin_lock(&phydev->lock);
 687         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 688                 phydev->state = PHY_CHANGELINK;
 689         spin_unlock(&phydev->lock);
 690
 691         enable_irq(phydev->irq);
 692
 693         /* Reenable interrupts */
 694         if (PHY_HALTED != phydev->state)
 695                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 696
 697         if (err)
 698                 goto irq_enable_err;
 699
 700         return;
 701
 702 irq_enable_err:
 703         disable_irq(phydev->irq);
 704 phy_err:
 705         phy_error(phydev);
 706 }
 707
 708 /**
 709  * phy_stop - Bring down the PHY link, and stop checking the status
 710  * @phydev: target phy_device struct
 711  */
 712 void phy_stop(struct phy_device *phydev)
 713 {
 714         spin_lock(&phydev->lock);
 715
 716         if (PHY_HALTED == phydev->state)
 717                 goto out_unlock;
 718
 719         phydev->state = PHY_HALTED;
 720
 721         if (phydev->irq != PHY_POLL) {
 722                 /* Disable PHY Interrupts */
 723                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 724
 725                 /* Clear any pending interrupts */
 726                 phy_clear_interrupt(phydev);
 727         }
 728
 729 out_unlock:
 730         spin_unlock(&phydev->lock);
 731
 732         /*
 733          * Cannot call flush_scheduled_work() here as desired because
 734          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 735          * will not reenable interrupts.
 736          */
 737 }
 738
 739
 740 /**
 741  * phy_start - start or restart a PHY device
 742  * @phydev: target phy_device struct
 743  *
 744  * Description: Indicates the attached device's readiness to
 745  *   handle PHY-related work.  Used during startup to start the
 746  *   PHY, and after a call to phy_stop() to resume operation.
 747  *   Also used to indicate the MDIO bus has cleared an error
 748  *   condition.
 749  */
 750 void phy_start(struct phy_device *phydev)
 751 {
 752         spin_lock(&phydev->lock);
 753
 754         switch (phydev->state) {
 755                 case PHY_STARTING:
 756                         phydev->state = PHY_PENDING;
 757                         break;
 758                 case PHY_READY:
 759                         phydev->state = PHY_UP;
 760                         break;
 761                 case PHY_HALTED:
 762                         phydev->state = PHY_RESUMING;
 763                 default:
 764                         break;
 765         }
 766         spin_unlock(&phydev->lock);
 767 }
 768 EXPORT_SYMBOL(phy_stop);
 769 EXPORT_SYMBOL(phy_start);
 770
 771 /* PHY timer which handles the state machine */
 772 static void phy_timer(unsigned long data)
 773 {
 774         struct phy_device *phydev = (struct phy_device *)data;
 775         int needs_aneg = 0;
 776         int err = 0;
 777
 778         spin_lock(&phydev->lock);
 779
 780         if (phydev->adjust_state)
 781                 phydev->adjust_state(phydev->attached_dev);
 782
 783         switch(phydev->state) {
 784                 case PHY_DOWN:
 785                 case PHY_STARTING:
 786                 case PHY_READY:
 787                 case PHY_PENDING:
 788                         break;
 789                 case PHY_UP:
 790                         needs_aneg = 1;
 791
 792                         phydev->link_timeout = PHY_AN_TIMEOUT;
 793
 794                         break;
 795                 case PHY_AN:
 796                         err = phy_read_status(phydev);
 797
 798                         if (err < 0)
 799                                 break;
 800
 801                         /* If the link is down, give up on
 802                          * negotiation for now */
 803                         if (!phydev->link) {
 804                                 phydev->state = PHY_NOLINK;
 805                                 netif_carrier_off(phydev->attached_dev);
 806                                 phydev->adjust_link(phydev->attached_dev);
 807                                 break;
 808                         }
 809
 810                         /* Check if negotiation is done.  Break
 811                          * if there's an error */
 812                         err = phy_aneg_done(phydev);
 813                         if (err < 0)
 814                                 break;
 815
 816                         /* If AN is done, we're running */
 817                         if (err > 0) {
 818                                 phydev->state = PHY_RUNNING;
 819                                 netif_carrier_on(phydev->attached_dev);
 820                                 phydev->adjust_link(phydev->attached_dev);
 821
 822                         } else if (0 == phydev->link_timeout--) {
 823                                 int idx;
 824
 825                                 needs_aneg = 1;
 826                                 /* If we have the magic_aneg bit,
 827                                  * we try again */
 828                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 829                                         break;
 830
 831                                 /* The timer expired, and we still
 832                                  * don't have a setting, so we try
 833                                  * forcing it until we find one that
 834                                  * works, starting from the fastest speed,
 835                                  * and working our way down */
 836                                 idx = phy_find_valid(0, phydev->supported);
 837
 838                                 phydev->speed = settings[idx].speed;
 839                                 phydev->duplex = settings[idx].duplex;
 840
 841                                 phydev->autoneg = AUTONEG_DISABLE;
 842
 843                                 pr_info("Trying %d/%s\n", phydev->speed,
 844                                                 DUPLEX_FULL ==
 845                                                 phydev->duplex ?
 846                                                 "FULL" : "HALF");
 847                         }
 848                         break;
 849                 case PHY_NOLINK:
 850                         err = phy_read_status(phydev);
 851
 852                         if (err)
 853                                 break;
 854
 855                         if (phydev->link) {
 856                                 phydev->state = PHY_RUNNING;
 857                                 netif_carrier_on(phydev->attached_dev);
 858                                 phydev->adjust_link(phydev->attached_dev);
 859                         }
 860                         break;
 861                 case PHY_FORCING:
 862                         err = genphy_update_link(phydev);
 863
 864                         if (err)
 865                                 break;
 866
 867                         if (phydev->link) {
 868                                 phydev->state = PHY_RUNNING;
 869                                 netif_carrier_on(phydev->attached_dev);
 870                         } else {
 871                                 if (0 == phydev->link_timeout--) {
 872                                         phy_force_reduction(phydev);
 873                                         needs_aneg = 1;
 874                                 }
 875                         }
 876
 877                         phydev->adjust_link(phydev->attached_dev);
 878                         break;
 879                 case PHY_RUNNING:
 880                         /* Only register a CHANGE if we are
 881                          * polling */
 882                         if (PHY_POLL == phydev->irq)
 883                                 phydev->state = PHY_CHANGELINK;
 884                         break;
 885                 case PHY_CHANGELINK:
 886                         err = phy_read_status(phydev);
 887
 888                         if (err)
 889                                 break;
 890
 891                         if (phydev->link) {
 892                                 phydev->state = PHY_RUNNING;
 893                                 netif_carrier_on(phydev->attached_dev);
 894                         } else {
 895                                 phydev->state = PHY_NOLINK;
 896                                 netif_carrier_off(phydev->attached_dev);
 897                         }
 898
 899                         phydev->adjust_link(phydev->attached_dev);
 900
 901                         if (PHY_POLL != phydev->irq)
 902                                 err = phy_config_interrupt(phydev,
 903                                                 PHY_INTERRUPT_ENABLED);
 904                         break;
 905                 case PHY_HALTED:
 906                         if (phydev->link) {
 907                                 phydev->link = 0;
 908                                 netif_carrier_off(phydev->attached_dev);
 909                                 phydev->adjust_link(phydev->attached_dev);
 910                         }
 911                         break;
 912                 case PHY_RESUMING:
 913
 914                         err = phy_clear_interrupt(phydev);
 915
 916                         if (err)
 917                                 break;
 918
 919                         err = phy_config_interrupt(phydev,
 920                                         PHY_INTERRUPT_ENABLED);
 921
 922                         if (err)
 923                                 break;
 924
 925                         if (AUTONEG_ENABLE == phydev->autoneg) {
 926                                 err = phy_aneg_done(phydev);
 927                                 if (err < 0)
 928                                         break;
 929
 930                                 /* err > 0 if AN is done.
 931                                  * Otherwise, it's 0, and we're
 932                                  * still waiting for AN */
 933                                 if (err > 0) {
 934                                         phydev->state = PHY_RUNNING;
 935                                 } else {
 936                                         phydev->state = PHY_AN;
 937                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 938                                 }
 939                         } else
 940                                 phydev->state = PHY_RUNNING;
 941                         break;
 942         }
 943
 944         spin_unlock(&phydev->lock);
 945
 946         if (needs_aneg)
 947                 err = phy_start_aneg(phydev);
 948
 949         if (err < 0)
 950                 phy_error(phydev);
 951
 952         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 953 }
 954