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, 2007  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/mm.h>
  30 #include <linux/module.h>
  31 #include <linux/mii.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/phy.h>
  34 #include <linux/timer.h>
  35 #include <linux/workqueue.h>
  36
  37 #include <asm/atomic.h>
  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         BUG_ON(in_interrupt());
  75
  76         mutex_lock(&bus->mdio_lock);
  77         retval = bus->read(bus, phydev->addr, regnum);
  78         mutex_unlock(&bus->mdio_lock);
  79
  80         return retval;
  81 }
  82 EXPORT_SYMBOL(phy_read);
  83
  84 /**
  85  * phy_write - Convenience function for writing a given PHY register
  86  * @phydev: the phy_device struct
  87  * @regnum: register number to write
  88  * @val: value to write to @regnum
  89  *
  90  * NOTE: MUST NOT be called from interrupt context,
  91  * because the bus read/write functions may wait for an interrupt
  92  * to conclude the operation.
  93  */
  94 int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
  95 {
  96         int err;
  97         struct mii_bus *bus = phydev->bus;
  98
  99         BUG_ON(in_interrupt());
 100
 101         mutex_lock(&bus->mdio_lock);
 102         err = bus->write(bus, phydev->addr, regnum, val);
 103         mutex_unlock(&bus->mdio_lock);
 104
 105         return err;
 106 }
 107 EXPORT_SYMBOL(phy_write);
 108
 109 /**
 110  * phy_clear_interrupt - Ack the phy device's interrupt
 111  * @phydev: the phy_device struct
 112  *
 113  * If the @phydev driver has an ack_interrupt function, call it to
 114  * ack and clear the phy device's interrupt.
 115  *
 116  * Returns 0 on success on < 0 on error.
 117  */
 118 int phy_clear_interrupt(struct phy_device *phydev)
 119 {
 120         int err = 0;
 121
 122         if (phydev->drv->ack_interrupt)
 123                 err = phydev->drv->ack_interrupt(phydev);
 124
 125         return err;
 126 }
 127
 128 /**
 129  * phy_config_interrupt - configure the PHY device for the requested interrupts
 130  * @phydev: the phy_device struct
 131  * @interrupts: interrupt flags to configure for this @phydev
 132  *
 133  * Returns 0 on success on < 0 on error.
 134  */
 135 int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 136 {
 137         int err = 0;
 138
 139         phydev->interrupts = interrupts;
 140         if (phydev->drv->config_intr)
 141                 err = phydev->drv->config_intr(phydev);
 142
 143         return err;
 144 }
 145
 146
 147 /**
 148  * phy_aneg_done - return auto-negotiation status
 149  * @phydev: target phy_device struct
 150  *
 151  * Description: Reads the status register and returns 0 either if
 152  *   auto-negotiation is incomplete, or if there was an error.
 153  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 154  */
 155 static inline int phy_aneg_done(struct phy_device *phydev)
 156 {
 157         int retval;
 158
 159         retval = phy_read(phydev, MII_BMSR);
 160
 161         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 162 }
 163
 164 /* A structure for mapping a particular speed and duplex
 165  * combination to a particular SUPPORTED and ADVERTISED value */
 166 struct phy_setting {
 167         int speed;
 168         int duplex;
 169         u32 setting;
 170 };
 171
 172 /* A mapping of all SUPPORTED settings to speed/duplex */
 173 static const struct phy_setting settings[] = {
 174         {
 175                 .speed = 10000,
 176                 .duplex = DUPLEX_FULL,
 177                 .setting = SUPPORTED_10000baseT_Full,
 178         },
 179         {
 180                 .speed = SPEED_1000,
 181                 .duplex = DUPLEX_FULL,
 182                 .setting = SUPPORTED_1000baseT_Full,
 183         },
 184         {
 185                 .speed = SPEED_1000,
 186                 .duplex = DUPLEX_HALF,
 187                 .setting = SUPPORTED_1000baseT_Half,
 188         },
 189         {
 190                 .speed = SPEED_100,
 191                 .duplex = DUPLEX_FULL,
 192                 .setting = SUPPORTED_100baseT_Full,
 193         },
 194         {
 195                 .speed = SPEED_100,
 196                 .duplex = DUPLEX_HALF,
 197                 .setting = SUPPORTED_100baseT_Half,
 198         },
 199         {
 200                 .speed = SPEED_10,
 201                 .duplex = DUPLEX_FULL,
 202                 .setting = SUPPORTED_10baseT_Full,
 203         },
 204         {
 205                 .speed = SPEED_10,
 206                 .duplex = DUPLEX_HALF,
 207                 .setting = SUPPORTED_10baseT_Half,
 208         },
 209 };
 210
 211 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 212
 213 /**
 214  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 215  * @speed: speed to match
 216  * @duplex: duplex to match
 217  *
 218  * Description: Searches the settings array for the setting which
 219  *   matches the desired speed and duplex, and returns the index
 220  *   of that setting.  Returns the index of the last setting if
 221  *   none of the others match.
 222  */
 223 static inline int phy_find_setting(int speed, int duplex)
 224 {
 225         int idx = 0;
 226
 227         while (idx < ARRAY_SIZE(settings) &&
 228                         (settings[idx].speed != speed ||
 229                         settings[idx].duplex != duplex))
 230                 idx++;
 231
 232         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 233 }
 234
 235 /**
 236  * phy_find_valid - find a PHY setting that matches the requested features mask
 237  * @idx: The first index in settings[] to search
 238  * @features: A mask of the valid settings
 239  *
 240  * Description: Returns the index of the first valid setting less
 241  *   than or equal to the one pointed to by idx, as determined by
 242  *   the mask in features.  Returns the index of the last setting
 243  *   if nothing else matches.
 244  */
 245 static inline int phy_find_valid(int idx, u32 features)
 246 {
 247         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 248                 idx++;
 249
 250         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 251 }
 252
 253 /**
 254  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 255  * @phydev: the target phy_device struct
 256  *
 257  * Description: Make sure the PHY is set to supported speeds and
 258  *   duplexes.  Drop down by one in this order:  1000/FULL,
 259  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 260  */
 261 void phy_sanitize_settings(struct phy_device *phydev)
 262 {
 263         u32 features = phydev->supported;
 264         int idx;
 265
 266         /* Sanitize settings based on PHY capabilities */
 267         if ((features & SUPPORTED_Autoneg) == 0)
 268                 phydev->autoneg = AUTONEG_DISABLE;
 269
 270         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 271                         features);
 272
 273         phydev->speed = settings[idx].speed;
 274         phydev->duplex = settings[idx].duplex;
 275 }
 276 EXPORT_SYMBOL(phy_sanitize_settings);
 277
 278 /**
 279  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 280  * @phydev: target phy_device struct
 281  * @cmd: ethtool_cmd
 282  *
 283  * A few notes about parameter checking:
 284  * - We don't set port or transceiver, so we don't care what they
 285  *   were set to.
 286  * - phy_start_aneg() will make sure forced settings are sane, and
 287  *   choose the next best ones from the ones selected, so we don't
 288  *   care if ethtool tries to give us bad values.
 289  */
 290 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 291 {
 292         if (cmd->phy_address != phydev->addr)
 293                 return -EINVAL;
 294
 295         /* We make sure that we don't pass unsupported
 296          * values in to the PHY */
 297         cmd->advertising &= phydev->supported;
 298
 299         /* Verify the settings we care about. */
 300         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 301                 return -EINVAL;
 302
 303         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 304                 return -EINVAL;
 305
 306         if (cmd->autoneg == AUTONEG_DISABLE
 307                         && ((cmd->speed != SPEED_1000
 308                                         && cmd->speed != SPEED_100
 309                                         && cmd->speed != SPEED_10)
 310                                 || (cmd->duplex != DUPLEX_HALF
 311                                         && cmd->duplex != DUPLEX_FULL)))
 312                 return -EINVAL;
 313
 314         phydev->autoneg = cmd->autoneg;
 315
 316         phydev->speed = cmd->speed;
 317
 318         phydev->advertising = cmd->advertising;
 319
 320         if (AUTONEG_ENABLE == cmd->autoneg)
 321                 phydev->advertising |= ADVERTISED_Autoneg;
 322         else
 323                 phydev->advertising &= ~ADVERTISED_Autoneg;
 324
 325         phydev->duplex = cmd->duplex;
 326
 327         /* Restart the PHY */
 328         phy_start_aneg(phydev);
 329
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(phy_ethtool_sset);
 333
 334 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 335 {
 336         cmd->supported = phydev->supported;
 337
 338         cmd->advertising = phydev->advertising;
 339
 340         cmd->speed = phydev->speed;
 341         cmd->duplex = phydev->duplex;
 342         cmd->port = PORT_MII;
 343         cmd->phy_address = phydev->addr;
 344         cmd->transceiver = XCVR_EXTERNAL;
 345         cmd->autoneg = phydev->autoneg;
 346
 347         return 0;
 348 }
 349 EXPORT_SYMBOL(phy_ethtool_gset);
 350
 351 /**
 352  * phy_mii_ioctl - generic PHY MII ioctl interface
 353  * @phydev: the phy_device struct
 354  * @mii_data: MII ioctl data
 355  * @cmd: ioctl cmd to execute
 356  *
 357  * Note that this function is currently incompatible with the
 358  * PHYCONTROL layer.  It changes registers without regard to
 359  * current state.  Use at own risk.
 360  */
 361 int phy_mii_ioctl(struct phy_device *phydev,
 362                 struct mii_ioctl_data *mii_data, int cmd)
 363 {
 364         u16 val = mii_data->val_in;
 365
 366         switch (cmd) {
 367         case SIOCGMIIPHY:
 368                 mii_data->phy_id = phydev->addr;
 369                 break;
 370         case SIOCGMIIREG:
 371                 mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 372                 break;
 373
 374         case SIOCSMIIREG:
 375                 if (!capable(CAP_NET_ADMIN))
 376                         return -EPERM;
 377
 378                 if (mii_data->phy_id == phydev->addr) {
 379                         switch(mii_data->reg_num) {
 380                         case MII_BMCR:
 381                                 if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
 382                                         phydev->autoneg = AUTONEG_DISABLE;
 383                                 else
 384                                         phydev->autoneg = AUTONEG_ENABLE;
 385                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 386                                         phydev->duplex = DUPLEX_FULL;
 387                                 else
 388                                         phydev->duplex = DUPLEX_HALF;
 389                                 if ((!phydev->autoneg) &&
 390                                                 (val & BMCR_SPEED1000))
 391                                         phydev->speed = SPEED_1000;
 392                                 else if ((!phydev->autoneg) &&
 393                                                 (val & BMCR_SPEED100))
 394                                         phydev->speed = SPEED_100;
 395                                 break;
 396                         case MII_ADVERTISE:
 397                                 phydev->advertising = val;
 398                                 break;
 399                         default:
 400                                 /* do nothing */
 401                                 break;
 402                         }
 403                 }
 404
 405                 phy_write(phydev, mii_data->reg_num, val);
 406
 407                 if (mii_data->reg_num == MII_BMCR
 408                                 && val & BMCR_RESET
 409                                 && phydev->drv->config_init)
 410                         phydev->drv->config_init(phydev);
 411                 break;
 412
 413         default:
 414                 return -ENOTTY;
 415         }
 416
 417         return 0;
 418 }
 419 EXPORT_SYMBOL(phy_mii_ioctl);
 420
 421 /**
 422  * phy_start_aneg - start auto-negotiation for this PHY device
 423  * @phydev: the phy_device struct
 424  *
 425  * Description: Sanitizes the settings (if we're not autonegotiating
 426  *   them), and then calls the driver's config_aneg function.
 427  *   If the PHYCONTROL Layer is operating, we change the state to
 428  *   reflect the beginning of Auto-negotiation or forcing.
 429  */
 430 int phy_start_aneg(struct phy_device *phydev)
 431 {
 432         int err;
 433
 434         mutex_lock(&phydev->lock);
 435
 436         if (AUTONEG_DISABLE == phydev->autoneg)
 437                 phy_sanitize_settings(phydev);
 438
 439         err = phydev->drv->config_aneg(phydev);
 440
 441         if (err < 0)
 442                 goto out_unlock;
 443
 444         if (phydev->state != PHY_HALTED) {
 445                 if (AUTONEG_ENABLE == phydev->autoneg) {
 446                         phydev->state = PHY_AN;
 447                         phydev->link_timeout = PHY_AN_TIMEOUT;
 448                 } else {
 449                         phydev->state = PHY_FORCING;
 450                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 451                 }
 452         }
 453
 454 out_unlock:
 455         mutex_unlock(&phydev->lock);
 456         return err;
 457 }
 458 EXPORT_SYMBOL(phy_start_aneg);
 459
 460
 461 static void phy_change(struct work_struct *work);
 462 static void phy_state_machine(struct work_struct *work);
 463 static void phy_timer(unsigned long data);
 464
 465 /**
 466  * phy_start_machine - start PHY state machine tracking
 467  * @phydev: the phy_device struct
 468  * @handler: callback function for state change notifications
 469  *
 470  * Description: The PHY infrastructure can run a state machine
 471  *   which tracks whether the PHY is starting up, negotiating,
 472  *   etc.  This function starts the timer which tracks the state
 473  *   of the PHY.  If you want to be notified when the state changes,
 474  *   pass in the callback @handler, otherwise, pass NULL.  If you
 475  *   want to maintain your own state machine, do not call this
 476  *   function.
 477  */
 478 void phy_start_machine(struct phy_device *phydev,
 479                 void (*handler)(struct net_device *))
 480 {
 481         phydev->adjust_state = handler;
 482
 483         INIT_WORK(&phydev->state_queue, phy_state_machine);
 484         init_timer(&phydev->phy_timer);
 485         phydev->phy_timer.function = &phy_timer;
 486         phydev->phy_timer.data = (unsigned long) phydev;
 487         mod_timer(&phydev->phy_timer, jiffies + HZ);
 488 }
 489
 490 /**
 491  * phy_stop_machine - stop the PHY state machine tracking
 492  * @phydev: target phy_device struct
 493  *
 494  * Description: Stops the state machine timer, sets the state to UP
 495  *   (unless it wasn't up yet). This function must be called BEFORE
 496  *   phy_detach.
 497  */
 498 void phy_stop_machine(struct phy_device *phydev)
 499 {
 500         del_timer_sync(&phydev->phy_timer);
 501         cancel_work_sync(&phydev->state_queue);
 502
 503         mutex_lock(&phydev->lock);
 504         if (phydev->state > PHY_UP)
 505                 phydev->state = PHY_UP;
 506         mutex_unlock(&phydev->lock);
 507
 508         phydev->adjust_state = NULL;
 509 }
 510
 511 /**
 512  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 513  * @phydev: target phy_device struct
 514  *
 515  * Description: Reduces the speed/duplex settings by one notch,
 516  *   in this order--
 517  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 518  *   The function bottoms out at 10/HALF.
 519  */
 520 static void phy_force_reduction(struct phy_device *phydev)
 521 {
 522         int idx;
 523
 524         idx = phy_find_setting(phydev->speed, phydev->duplex);
 525
 526         idx++;
 527
 528         idx = phy_find_valid(idx, phydev->supported);
 529
 530         phydev->speed = settings[idx].speed;
 531         phydev->duplex = settings[idx].duplex;
 532
 533         pr_info("Trying %d/%s\n", phydev->speed,
 534                         DUPLEX_FULL == phydev->duplex ?
 535                         "FULL" : "HALF");
 536 }
 537
 538
 539 /**
 540  * phy_error - enter HALTED state for this PHY device
 541  * @phydev: target phy_device struct
 542  *
 543  * Moves the PHY to the HALTED state in response to a read
 544  * or write error, and tells the controller the link is down.
 545  * Must not be called from interrupt context, or while the
 546  * phydev->lock is held.
 547  */
 548 void phy_error(struct phy_device *phydev)
 549 {
 550         mutex_lock(&phydev->lock);
 551         phydev->state = PHY_HALTED;
 552         mutex_unlock(&phydev->lock);
 553 }
 554
 555 /**
 556  * phy_interrupt - PHY interrupt handler
 557  * @irq: interrupt line
 558  * @phy_dat: phy_device pointer
 559  *
 560  * Description: When a PHY interrupt occurs, the handler disables
 561  * interrupts, and schedules a work task to clear the interrupt.
 562  */
 563 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 564 {
 565         struct phy_device *phydev = phy_dat;
 566
 567         if (PHY_HALTED == phydev->state)
 568                 return IRQ_NONE;                /* It can't be ours.  */
 569
 570         /* The MDIO bus is not allowed to be written in interrupt
 571          * context, so we need to disable the irq here.  A work
 572          * queue will write the PHY to disable and clear the
 573          * interrupt, and then reenable the irq line. */
 574         disable_irq_nosync(irq);
 575         atomic_inc(&phydev->irq_disable);
 576
 577         schedule_work(&phydev->phy_queue);
 578
 579         return IRQ_HANDLED;
 580 }
 581
 582 /**
 583  * phy_enable_interrupts - Enable the interrupts from the PHY side
 584  * @phydev: target phy_device struct
 585  */
 586 int phy_enable_interrupts(struct phy_device *phydev)
 587 {
 588         int err;
 589
 590         err = phy_clear_interrupt(phydev);
 591
 592         if (err < 0)
 593                 return err;
 594
 595         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 596
 597         return err;
 598 }
 599 EXPORT_SYMBOL(phy_enable_interrupts);
 600
 601 /**
 602  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 603  * @phydev: target phy_device struct
 604  */
 605 int phy_disable_interrupts(struct phy_device *phydev)
 606 {
 607         int err;
 608
 609         /* Disable PHY interrupts */
 610         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 611
 612         if (err)
 613                 goto phy_err;
 614
 615         /* Clear the interrupt */
 616         err = phy_clear_interrupt(phydev);
 617
 618         if (err)
 619                 goto phy_err;
 620
 621         return 0;
 622
 623 phy_err:
 624         phy_error(phydev);
 625
 626         return err;
 627 }
 628 EXPORT_SYMBOL(phy_disable_interrupts);
 629
 630 /**
 631  * phy_start_interrupts - request and enable interrupts for a PHY device
 632  * @phydev: target phy_device struct
 633  *
 634  * Description: Request the interrupt for the given PHY.
 635  *   If this fails, then we set irq to PHY_POLL.
 636  *   Otherwise, we enable the interrupts in the PHY.
 637  *   This should only be called with a valid IRQ number.
 638  *   Returns 0 on success or < 0 on error.
 639  */
 640 int phy_start_interrupts(struct phy_device *phydev)
 641 {
 642         int err = 0;
 643
 644         INIT_WORK(&phydev->phy_queue, phy_change);
 645
 646         atomic_set(&phydev->irq_disable, 0);
 647         if (request_irq(phydev->irq, phy_interrupt,
 648                                 IRQF_SHARED,
 649                                 "phy_interrupt",
 650                                 phydev) < 0) {
 651                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 652                                 phydev->bus->name,
 653                                 phydev->irq);
 654                 phydev->irq = PHY_POLL;
 655                 return 0;
 656         }
 657
 658         err = phy_enable_interrupts(phydev);
 659
 660         return err;
 661 }
 662 EXPORT_SYMBOL(phy_start_interrupts);
 663
 664 /**
 665  * phy_stop_interrupts - disable interrupts from a PHY device
 666  * @phydev: target phy_device struct
 667  */
 668 int phy_stop_interrupts(struct phy_device *phydev)
 669 {
 670         int err;
 671
 672         err = phy_disable_interrupts(phydev);
 673
 674         if (err)
 675                 phy_error(phydev);
 676
 677         free_irq(phydev->irq, phydev);
 678
 679         /*
 680          * Cannot call flush_scheduled_work() here as desired because
 681          * of rtnl_lock(), but we do not really care about what would
 682          * be done, except from enable_irq(), so cancel any work
 683          * possibly pending and take care of the matter below.
 684          */
 685         cancel_work_sync(&phydev->phy_queue);
 686         /*
 687          * If work indeed has been cancelled, disable_irq() will have
 688          * been left unbalanced from phy_interrupt() and enable_irq()
 689          * has to be called so that other devices on the line work.
 690          */
 691         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 692                 enable_irq(phydev->irq);
 693
 694         return err;
 695 }
 696 EXPORT_SYMBOL(phy_stop_interrupts);
 697
 698
 699 /**
 700  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 701  * @work: work_struct that describes the work to be done
 702  */
 703 static void phy_change(struct work_struct *work)
 704 {
 705         int err;
 706         struct phy_device *phydev =
 707                 container_of(work, struct phy_device, phy_queue);
 708
 709         err = phy_disable_interrupts(phydev);
 710
 711         if (err)
 712                 goto phy_err;
 713
 714         mutex_lock(&phydev->lock);
 715         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 716                 phydev->state = PHY_CHANGELINK;
 717         mutex_unlock(&phydev->lock);
 718
 719         atomic_dec(&phydev->irq_disable);
 720         enable_irq(phydev->irq);
 721
 722         /* Reenable interrupts */
 723         if (PHY_HALTED != phydev->state)
 724                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 725
 726         if (err)
 727                 goto irq_enable_err;
 728
 729         return;
 730
 731 irq_enable_err:
 732         disable_irq(phydev->irq);
 733         atomic_inc(&phydev->irq_disable);
 734 phy_err:
 735         phy_error(phydev);
 736 }
 737
 738 /**
 739  * phy_stop - Bring down the PHY link, and stop checking the status
 740  * @phydev: target phy_device struct
 741  */
 742 void phy_stop(struct phy_device *phydev)
 743 {
 744         mutex_lock(&phydev->lock);
 745
 746         if (PHY_HALTED == phydev->state)
 747                 goto out_unlock;
 748
 749         if (phydev->irq != PHY_POLL) {
 750                 /* Disable PHY Interrupts */
 751                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 752
 753                 /* Clear any pending interrupts */
 754                 phy_clear_interrupt(phydev);
 755         }
 756
 757         phydev->state = PHY_HALTED;
 758
 759 out_unlock:
 760         mutex_unlock(&phydev->lock);
 761
 762         /*
 763          * Cannot call flush_scheduled_work() here as desired because
 764          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 765          * will not reenable interrupts.
 766          */
 767 }
 768
 769
 770 /**
 771  * phy_start - start or restart a PHY device
 772  * @phydev: target phy_device struct
 773  *
 774  * Description: Indicates the attached device's readiness to
 775  *   handle PHY-related work.  Used during startup to start the
 776  *   PHY, and after a call to phy_stop() to resume operation.
 777  *   Also used to indicate the MDIO bus has cleared an error
 778  *   condition.
 779  */
 780 void phy_start(struct phy_device *phydev)
 781 {
 782         mutex_lock(&phydev->lock);
 783
 784         switch (phydev->state) {
 785                 case PHY_STARTING:
 786                         phydev->state = PHY_PENDING;
 787                         break;
 788                 case PHY_READY:
 789                         phydev->state = PHY_UP;
 790                         break;
 791                 case PHY_HALTED:
 792                         phydev->state = PHY_RESUMING;
 793                 default:
 794                         break;
 795         }
 796         mutex_unlock(&phydev->lock);
 797 }
 798 EXPORT_SYMBOL(phy_stop);
 799 EXPORT_SYMBOL(phy_start);
 800
 801 /**
 802  * phy_state_machine - Handle the state machine
 803  * @work: work_struct that describes the work to be done
 804  *
 805  * Description: Scheduled by the state_queue workqueue each time
 806  *   phy_timer is triggered.
 807  */
 808 static void phy_state_machine(struct work_struct *work)
 809 {
 810         struct phy_device *phydev =
 811                         container_of(work, struct phy_device, state_queue);
 812         int needs_aneg = 0;
 813         int err = 0;
 814
 815         mutex_lock(&phydev->lock);
 816
 817         if (phydev->adjust_state)
 818                 phydev->adjust_state(phydev->attached_dev);
 819
 820         switch(phydev->state) {
 821                 case PHY_DOWN:
 822                 case PHY_STARTING:
 823                 case PHY_READY:
 824                 case PHY_PENDING:
 825                         break;
 826                 case PHY_UP:
 827                         needs_aneg = 1;
 828
 829                         phydev->link_timeout = PHY_AN_TIMEOUT;
 830
 831                         break;
 832                 case PHY_AN:
 833                         err = phy_read_status(phydev);
 834
 835                         if (err < 0)
 836                                 break;
 837
 838                         /* If the link is down, give up on
 839                          * negotiation for now */
 840                         if (!phydev->link) {
 841                                 phydev->state = PHY_NOLINK;
 842                                 netif_carrier_off(phydev->attached_dev);
 843                                 phydev->adjust_link(phydev->attached_dev);
 844                                 break;
 845                         }
 846
 847                         /* Check if negotiation is done.  Break
 848                          * if there's an error */
 849                         err = phy_aneg_done(phydev);
 850                         if (err < 0)
 851                                 break;
 852
 853                         /* If AN is done, we're running */
 854                         if (err > 0) {
 855                                 phydev->state = PHY_RUNNING;
 856                                 netif_carrier_on(phydev->attached_dev);
 857                                 phydev->adjust_link(phydev->attached_dev);
 858
 859                         } else if (0 == phydev->link_timeout--) {
 860                                 int idx;
 861
 862                                 needs_aneg = 1;
 863                                 /* If we have the magic_aneg bit,
 864                                  * we try again */
 865                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 866                                         break;
 867
 868                                 /* The timer expired, and we still
 869                                  * don't have a setting, so we try
 870                                  * forcing it until we find one that
 871                                  * works, starting from the fastest speed,
 872                                  * and working our way down */
 873                                 idx = phy_find_valid(0, phydev->supported);
 874
 875                                 phydev->speed = settings[idx].speed;
 876                                 phydev->duplex = settings[idx].duplex;
 877
 878                                 phydev->autoneg = AUTONEG_DISABLE;
 879
 880                                 pr_info("Trying %d/%s\n", phydev->speed,
 881                                                 DUPLEX_FULL ==
 882                                                 phydev->duplex ?
 883                                                 "FULL" : "HALF");
 884                         }
 885                         break;
 886                 case PHY_NOLINK:
 887                         err = phy_read_status(phydev);
 888
 889                         if (err)
 890                                 break;
 891
 892                         if (phydev->link) {
 893                                 phydev->state = PHY_RUNNING;
 894                                 netif_carrier_on(phydev->attached_dev);
 895                                 phydev->adjust_link(phydev->attached_dev);
 896                         }
 897                         break;
 898                 case PHY_FORCING:
 899                         err = genphy_update_link(phydev);
 900
 901                         if (err)
 902                                 break;
 903
 904                         if (phydev->link) {
 905                                 phydev->state = PHY_RUNNING;
 906                                 netif_carrier_on(phydev->attached_dev);
 907                         } else {
 908                                 if (0 == phydev->link_timeout--) {
 909                                         phy_force_reduction(phydev);
 910                                         needs_aneg = 1;
 911                                 }
 912                         }
 913
 914                         phydev->adjust_link(phydev->attached_dev);
 915                         break;
 916                 case PHY_RUNNING:
 917                         /* Only register a CHANGE if we are
 918                          * polling */
 919                         if (PHY_POLL == phydev->irq)
 920                                 phydev->state = PHY_CHANGELINK;
 921                         break;
 922                 case PHY_CHANGELINK:
 923                         err = phy_read_status(phydev);
 924
 925                         if (err)
 926                                 break;
 927
 928                         if (phydev->link) {
 929                                 phydev->state = PHY_RUNNING;
 930                                 netif_carrier_on(phydev->attached_dev);
 931                         } else {
 932                                 phydev->state = PHY_NOLINK;
 933                                 netif_carrier_off(phydev->attached_dev);
 934                         }
 935
 936                         phydev->adjust_link(phydev->attached_dev);
 937
 938                         if (PHY_POLL != phydev->irq)
 939                                 err = phy_config_interrupt(phydev,
 940                                                 PHY_INTERRUPT_ENABLED);
 941                         break;
 942                 case PHY_HALTED:
 943                         if (phydev->link) {
 944                                 phydev->link = 0;
 945                                 netif_carrier_off(phydev->attached_dev);
 946                                 phydev->adjust_link(phydev->attached_dev);
 947                         }
 948                         break;
 949                 case PHY_RESUMING:
 950
 951                         err = phy_clear_interrupt(phydev);
 952
 953                         if (err)
 954                                 break;
 955
 956                         err = phy_config_interrupt(phydev,
 957                                         PHY_INTERRUPT_ENABLED);
 958
 959                         if (err)
 960                                 break;
 961
 962                         if (AUTONEG_ENABLE == phydev->autoneg) {
 963                                 err = phy_aneg_done(phydev);
 964                                 if (err < 0)
 965                                         break;
 966
 967                                 /* err > 0 if AN is done.
 968                                  * Otherwise, it's 0, and we're
 969                                  * still waiting for AN */
 970                                 if (err > 0) {
 971                                         phydev->state = PHY_RUNNING;
 972                                 } else {
 973                                         phydev->state = PHY_AN;
 974                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 975                                 }
 976                         } else
 977                                 phydev->state = PHY_RUNNING;
 978                         break;
 979         }
 980
 981         mutex_unlock(&phydev->lock);
 982
 983         if (needs_aneg)
 984                 err = phy_start_aneg(phydev);
 985
 986         if (err < 0)
 987                 phy_error(phydev);
 988
 989         mod_timer(&phydev->phy_timer, jiffies + PHY_STATE_TIME * HZ);
 990 }
 991
 992 /* PHY timer which schedules the state machine work */
 993 static void phy_timer(unsigned long data)
 994 {
 995         struct phy_device *phydev = (struct phy_device *)data;
 996
 997         /*
 998          * PHY I/O operations can potentially sleep so we ensure that
 999          * it's done from a process context
1000          */
1001         schedule_work(&phydev->state_queue);
1002 }