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/interrupt.h>
  23 #include <linux/init.h>
  24 #include <linux/delay.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/mm.h>
  29 #include <linux/module.h>
  30 #include <linux/mii.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/phy.h>
  33 #include <linux/timer.h>
  34 #include <linux/workqueue.h>
  35
  36 #include <asm/atomic.h>
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40
  41 /**
  42  * phy_print_status - Convenience function to print out the current phy status
  43  * @phydev: the phy_device struct
  44  */
  45 void phy_print_status(struct phy_device *phydev)
  46 {
  47         pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev),
  48                         phydev->link ? "Up" : "Down");
  49         if (phydev->link)
  50                 printk(KERN_CONT " - %d/%s", phydev->speed,
  51                                 DUPLEX_FULL == phydev->duplex ?
  52                                 "Full" : "Half");
  53
  54         printk(KERN_CONT "\n");
  55 }
  56 EXPORT_SYMBOL(phy_print_status);
  57
  58
  59 /**
  60  * phy_clear_interrupt - Ack the phy device's interrupt
  61  * @phydev: the phy_device struct
  62  *
  63  * If the @phydev driver has an ack_interrupt function, call it to
  64  * ack and clear the phy device's interrupt.
  65  *
  66  * Returns 0 on success on < 0 on error.
  67  */
  68 static int phy_clear_interrupt(struct phy_device *phydev)
  69 {
  70         int err = 0;
  71
  72         if (phydev->drv->ack_interrupt)
  73                 err = phydev->drv->ack_interrupt(phydev);
  74
  75         return err;
  76 }
  77
  78 /**
  79  * phy_config_interrupt - configure the PHY device for the requested interrupts
  80  * @phydev: the phy_device struct
  81  * @interrupts: interrupt flags to configure for this @phydev
  82  *
  83  * Returns 0 on success on < 0 on error.
  84  */
  85 static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
  86 {
  87         int err = 0;
  88
  89         phydev->interrupts = interrupts;
  90         if (phydev->drv->config_intr)
  91                 err = phydev->drv->config_intr(phydev);
  92
  93         return err;
  94 }
  95
  96
  97 /**
  98  * phy_aneg_done - return auto-negotiation status
  99  * @phydev: target phy_device struct
 100  *
 101  * Description: Reads the status register and returns 0 either if
 102  *   auto-negotiation is incomplete, or if there was an error.
 103  *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 104  */
 105 static inline int phy_aneg_done(struct phy_device *phydev)
 106 {
 107         int retval;
 108
 109         retval = phy_read(phydev, MII_BMSR);
 110
 111         return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 112 }
 113
 114 /* A structure for mapping a particular speed and duplex
 115  * combination to a particular SUPPORTED and ADVERTISED value */
 116 struct phy_setting {
 117         int speed;
 118         int duplex;
 119         u32 setting;
 120 };
 121
 122 /* A mapping of all SUPPORTED settings to speed/duplex */
 123 static const struct phy_setting settings[] = {
 124         {
 125                 .speed = 10000,
 126                 .duplex = DUPLEX_FULL,
 127                 .setting = SUPPORTED_10000baseT_Full,
 128         },
 129         {
 130                 .speed = SPEED_1000,
 131                 .duplex = DUPLEX_FULL,
 132                 .setting = SUPPORTED_1000baseT_Full,
 133         },
 134         {
 135                 .speed = SPEED_1000,
 136                 .duplex = DUPLEX_HALF,
 137                 .setting = SUPPORTED_1000baseT_Half,
 138         },
 139         {
 140                 .speed = SPEED_100,
 141                 .duplex = DUPLEX_FULL,
 142                 .setting = SUPPORTED_100baseT_Full,
 143         },
 144         {
 145                 .speed = SPEED_100,
 146                 .duplex = DUPLEX_HALF,
 147                 .setting = SUPPORTED_100baseT_Half,
 148         },
 149         {
 150                 .speed = SPEED_10,
 151                 .duplex = DUPLEX_FULL,
 152                 .setting = SUPPORTED_10baseT_Full,
 153         },
 154         {
 155                 .speed = SPEED_10,
 156                 .duplex = DUPLEX_HALF,
 157                 .setting = SUPPORTED_10baseT_Half,
 158         },
 159 };
 160
 161 #define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 162
 163 /**
 164  * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 165  * @speed: speed to match
 166  * @duplex: duplex to match
 167  *
 168  * Description: Searches the settings array for the setting which
 169  *   matches the desired speed and duplex, and returns the index
 170  *   of that setting.  Returns the index of the last setting if
 171  *   none of the others match.
 172  */
 173 static inline int phy_find_setting(int speed, int duplex)
 174 {
 175         int idx = 0;
 176
 177         while (idx < ARRAY_SIZE(settings) &&
 178                         (settings[idx].speed != speed ||
 179                         settings[idx].duplex != duplex))
 180                 idx++;
 181
 182         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 183 }
 184
 185 /**
 186  * phy_find_valid - find a PHY setting that matches the requested features mask
 187  * @idx: The first index in settings[] to search
 188  * @features: A mask of the valid settings
 189  *
 190  * Description: Returns the index of the first valid setting less
 191  *   than or equal to the one pointed to by idx, as determined by
 192  *   the mask in features.  Returns the index of the last setting
 193  *   if nothing else matches.
 194  */
 195 static inline int phy_find_valid(int idx, u32 features)
 196 {
 197         while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 198                 idx++;
 199
 200         return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 201 }
 202
 203 /**
 204  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 205  * @phydev: the target phy_device struct
 206  *
 207  * Description: Make sure the PHY is set to supported speeds and
 208  *   duplexes.  Drop down by one in this order:  1000/FULL,
 209  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 210  */
 211 static void phy_sanitize_settings(struct phy_device *phydev)
 212 {
 213         u32 features = phydev->supported;
 214         int idx;
 215
 216         /* Sanitize settings based on PHY capabilities */
 217         if ((features & SUPPORTED_Autoneg) == 0)
 218                 phydev->autoneg = AUTONEG_DISABLE;
 219
 220         idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 221                         features);
 222
 223         phydev->speed = settings[idx].speed;
 224         phydev->duplex = settings[idx].duplex;
 225 }
 226
 227 /**
 228  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 229  * @phydev: target phy_device struct
 230  * @cmd: ethtool_cmd
 231  *
 232  * A few notes about parameter checking:
 233  * - We don't set port or transceiver, so we don't care what they
 234  *   were set to.
 235  * - phy_start_aneg() will make sure forced settings are sane, and
 236  *   choose the next best ones from the ones selected, so we don't
 237  *   care if ethtool tries to give us bad values.
 238  */
 239 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 240 {
 241         if (cmd->phy_address != phydev->addr)
 242                 return -EINVAL;
 243
 244         /* We make sure that we don't pass unsupported
 245          * values in to the PHY */
 246         cmd->advertising &= phydev->supported;
 247
 248         /* Verify the settings we care about. */
 249         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 250                 return -EINVAL;
 251
 252         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 253                 return -EINVAL;
 254
 255         if (cmd->autoneg == AUTONEG_DISABLE &&
 256             ((cmd->speed != SPEED_1000 &&
 257               cmd->speed != SPEED_100 &&
 258               cmd->speed != SPEED_10) ||
 259              (cmd->duplex != DUPLEX_HALF &&
 260               cmd->duplex != DUPLEX_FULL)))
 261                 return -EINVAL;
 262
 263         phydev->autoneg = cmd->autoneg;
 264
 265         phydev->speed = cmd->speed;
 266
 267         phydev->advertising = cmd->advertising;
 268
 269         if (AUTONEG_ENABLE == cmd->autoneg)
 270                 phydev->advertising |= ADVERTISED_Autoneg;
 271         else
 272                 phydev->advertising &= ~ADVERTISED_Autoneg;
 273
 274         phydev->duplex = cmd->duplex;
 275
 276         /* Restart the PHY */
 277         phy_start_aneg(phydev);
 278
 279         return 0;
 280 }
 281 EXPORT_SYMBOL(phy_ethtool_sset);
 282
 283 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 284 {
 285         cmd->supported = phydev->supported;
 286
 287         cmd->advertising = phydev->advertising;
 288
 289         cmd->speed = phydev->speed;
 290         cmd->duplex = phydev->duplex;
 291         cmd->port = PORT_MII;
 292         cmd->phy_address = phydev->addr;
 293         cmd->transceiver = XCVR_EXTERNAL;
 294         cmd->autoneg = phydev->autoneg;
 295
 296         return 0;
 297 }
 298 EXPORT_SYMBOL(phy_ethtool_gset);
 299
 300 /**
 301  * phy_mii_ioctl - generic PHY MII ioctl interface
 302  * @phydev: the phy_device struct
 303  * @ifr: &struct ifreq for socket ioctl's
 304  * @cmd: ioctl cmd to execute
 305  *
 306  * Note that this function is currently incompatible with the
 307  * PHYCONTROL layer.  It changes registers without regard to
 308  * current state.  Use at own risk.
 309  */
 310 int phy_mii_ioctl(struct phy_device *phydev,
 311                 struct ifreq *ifr, int cmd)
 312 {
 313         struct mii_ioctl_data *mii_data = if_mii(ifr);
 314         u16 val = mii_data->val_in;
 315
 316         switch (cmd) {
 317         case SIOCGMIIPHY:
 318                 mii_data->phy_id = phydev->addr;
 319                 /* fall through */
 320
 321         case SIOCGMIIREG:
 322                 mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id,
 323                                                  mii_data->reg_num);
 324                 break;
 325
 326         case SIOCSMIIREG:
 327                 if (mii_data->phy_id == phydev->addr) {
 328                         switch(mii_data->reg_num) {
 329                         case MII_BMCR:
 330                                 if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
 331                                         phydev->autoneg = AUTONEG_DISABLE;
 332                                 else
 333                                         phydev->autoneg = AUTONEG_ENABLE;
 334                                 if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 335                                         phydev->duplex = DUPLEX_FULL;
 336                                 else
 337                                         phydev->duplex = DUPLEX_HALF;
 338                                 if ((!phydev->autoneg) &&
 339                                                 (val & BMCR_SPEED1000))
 340                                         phydev->speed = SPEED_1000;
 341                                 else if ((!phydev->autoneg) &&
 342                                                 (val & BMCR_SPEED100))
 343                                         phydev->speed = SPEED_100;
 344                                 break;
 345                         case MII_ADVERTISE:
 346                                 phydev->advertising = val;
 347                                 break;
 348                         default:
 349                                 /* do nothing */
 350                                 break;
 351                         }
 352                 }
 353
 354                 mdiobus_write(phydev->bus, mii_data->phy_id,
 355                               mii_data->reg_num, val);
 356
 357                 if (mii_data->reg_num == MII_BMCR &&
 358                     val & BMCR_RESET &&
 359                     phydev->drv->config_init) {
 360                         phy_scan_fixups(phydev);
 361                         phydev->drv->config_init(phydev);
 362                 }
 363                 break;
 364
 365         case SIOCSHWTSTAMP:
 366                 if (phydev->drv->hwtstamp)
 367                         return phydev->drv->hwtstamp(phydev, ifr);
 368                 /* fall through */
 369
 370         default:
 371                 return -EOPNOTSUPP;
 372         }
 373
 374         return 0;
 375 }
 376 EXPORT_SYMBOL(phy_mii_ioctl);
 377
 378 /**
 379  * phy_start_aneg - start auto-negotiation for this PHY device
 380  * @phydev: the phy_device struct
 381  *
 382  * Description: Sanitizes the settings (if we're not autonegotiating
 383  *   them), and then calls the driver's config_aneg function.
 384  *   If the PHYCONTROL Layer is operating, we change the state to
 385  *   reflect the beginning of Auto-negotiation or forcing.
 386  */
 387 int phy_start_aneg(struct phy_device *phydev)
 388 {
 389         int err;
 390
 391         mutex_lock(&phydev->lock);
 392
 393         if (AUTONEG_DISABLE == phydev->autoneg)
 394                 phy_sanitize_settings(phydev);
 395
 396         err = phydev->drv->config_aneg(phydev);
 397
 398         if (err < 0)
 399                 goto out_unlock;
 400
 401         if (phydev->state != PHY_HALTED) {
 402                 if (AUTONEG_ENABLE == phydev->autoneg) {
 403                         phydev->state = PHY_AN;
 404                         phydev->link_timeout = PHY_AN_TIMEOUT;
 405                 } else {
 406                         phydev->state = PHY_FORCING;
 407                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 408                 }
 409         }
 410
 411 out_unlock:
 412         mutex_unlock(&phydev->lock);
 413         return err;
 414 }
 415 EXPORT_SYMBOL(phy_start_aneg);
 416
 417
 418 static void phy_change(struct work_struct *work);
 419
 420 /**
 421  * phy_start_machine - start PHY state machine tracking
 422  * @phydev: the phy_device struct
 423  * @handler: callback function for state change notifications
 424  *
 425  * Description: The PHY infrastructure can run a state machine
 426  *   which tracks whether the PHY is starting up, negotiating,
 427  *   etc.  This function starts the timer which tracks the state
 428  *   of the PHY.  If you want to be notified when the state changes,
 429  *   pass in the callback @handler, otherwise, pass NULL.  If you
 430  *   want to maintain your own state machine, do not call this
 431  *   function.
 432  */
 433 void phy_start_machine(struct phy_device *phydev,
 434                 void (*handler)(struct net_device *))
 435 {
 436         phydev->adjust_state = handler;
 437
 438         schedule_delayed_work(&phydev->state_queue, HZ);
 439 }
 440
 441 /**
 442  * phy_stop_machine - stop the PHY state machine tracking
 443  * @phydev: target phy_device struct
 444  *
 445  * Description: Stops the state machine timer, sets the state to UP
 446  *   (unless it wasn't up yet). This function must be called BEFORE
 447  *   phy_detach.
 448  */
 449 void phy_stop_machine(struct phy_device *phydev)
 450 {
 451         cancel_delayed_work_sync(&phydev->state_queue);
 452
 453         mutex_lock(&phydev->lock);
 454         if (phydev->state > PHY_UP)
 455                 phydev->state = PHY_UP;
 456         mutex_unlock(&phydev->lock);
 457
 458         phydev->adjust_state = NULL;
 459 }
 460
 461 /**
 462  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 463  * @phydev: target phy_device struct
 464  *
 465  * Description: Reduces the speed/duplex settings by one notch,
 466  *   in this order--
 467  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 468  *   The function bottoms out at 10/HALF.
 469  */
 470 static void phy_force_reduction(struct phy_device *phydev)
 471 {
 472         int idx;
 473
 474         idx = phy_find_setting(phydev->speed, phydev->duplex);
 475
 476         idx++;
 477
 478         idx = phy_find_valid(idx, phydev->supported);
 479
 480         phydev->speed = settings[idx].speed;
 481         phydev->duplex = settings[idx].duplex;
 482
 483         pr_info("Trying %d/%s\n", phydev->speed,
 484                         DUPLEX_FULL == phydev->duplex ?
 485                         "FULL" : "HALF");
 486 }
 487
 488
 489 /**
 490  * phy_error - enter HALTED state for this PHY device
 491  * @phydev: target phy_device struct
 492  *
 493  * Moves the PHY to the HALTED state in response to a read
 494  * or write error, and tells the controller the link is down.
 495  * Must not be called from interrupt context, or while the
 496  * phydev->lock is held.
 497  */
 498 static void phy_error(struct phy_device *phydev)
 499 {
 500         mutex_lock(&phydev->lock);
 501         phydev->state = PHY_HALTED;
 502         mutex_unlock(&phydev->lock);
 503 }
 504
 505 /**
 506  * phy_interrupt - PHY interrupt handler
 507  * @irq: interrupt line
 508  * @phy_dat: phy_device pointer
 509  *
 510  * Description: When a PHY interrupt occurs, the handler disables
 511  * interrupts, and schedules a work task to clear the interrupt.
 512  */
 513 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 514 {
 515         struct phy_device *phydev = phy_dat;
 516
 517         if (PHY_HALTED == phydev->state)
 518                 return IRQ_NONE;                /* It can't be ours.  */
 519
 520         /* The MDIO bus is not allowed to be written in interrupt
 521          * context, so we need to disable the irq here.  A work
 522          * queue will write the PHY to disable and clear the
 523          * interrupt, and then reenable the irq line. */
 524         disable_irq_nosync(irq);
 525         atomic_inc(&phydev->irq_disable);
 526
 527         schedule_work(&phydev->phy_queue);
 528
 529         return IRQ_HANDLED;
 530 }
 531
 532 /**
 533  * phy_enable_interrupts - Enable the interrupts from the PHY side
 534  * @phydev: target phy_device struct
 535  */
 536 static int phy_enable_interrupts(struct phy_device *phydev)
 537 {
 538         int err;
 539
 540         err = phy_clear_interrupt(phydev);
 541
 542         if (err < 0)
 543                 return err;
 544
 545         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 546
 547         return err;
 548 }
 549
 550 /**
 551  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 552  * @phydev: target phy_device struct
 553  */
 554 static int phy_disable_interrupts(struct phy_device *phydev)
 555 {
 556         int err;
 557
 558         /* Disable PHY interrupts */
 559         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 560
 561         if (err)
 562                 goto phy_err;
 563
 564         /* Clear the interrupt */
 565         err = phy_clear_interrupt(phydev);
 566
 567         if (err)
 568                 goto phy_err;
 569
 570         return 0;
 571
 572 phy_err:
 573         phy_error(phydev);
 574
 575         return err;
 576 }
 577
 578 /**
 579  * phy_start_interrupts - request and enable interrupts for a PHY device
 580  * @phydev: target phy_device struct
 581  *
 582  * Description: Request the interrupt for the given PHY.
 583  *   If this fails, then we set irq to PHY_POLL.
 584  *   Otherwise, we enable the interrupts in the PHY.
 585  *   This should only be called with a valid IRQ number.
 586  *   Returns 0 on success or < 0 on error.
 587  */
 588 int phy_start_interrupts(struct phy_device *phydev)
 589 {
 590         int err = 0;
 591
 592         INIT_WORK(&phydev->phy_queue, phy_change);
 593
 594         atomic_set(&phydev->irq_disable, 0);
 595         if (request_irq(phydev->irq, phy_interrupt,
 596                                 IRQF_SHARED,
 597                                 "phy_interrupt",
 598                                 phydev) < 0) {
 599                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 600                                 phydev->bus->name,
 601                                 phydev->irq);
 602                 phydev->irq = PHY_POLL;
 603                 return 0;
 604         }
 605
 606         err = phy_enable_interrupts(phydev);
 607
 608         return err;
 609 }
 610 EXPORT_SYMBOL(phy_start_interrupts);
 611
 612 /**
 613  * phy_stop_interrupts - disable interrupts from a PHY device
 614  * @phydev: target phy_device struct
 615  */
 616 int phy_stop_interrupts(struct phy_device *phydev)
 617 {
 618         int err;
 619
 620         err = phy_disable_interrupts(phydev);
 621
 622         if (err)
 623                 phy_error(phydev);
 624
 625         free_irq(phydev->irq, phydev);
 626
 627         /*
 628          * Cannot call flush_scheduled_work() here as desired because
 629          * of rtnl_lock(), but we do not really care about what would
 630          * be done, except from enable_irq(), so cancel any work
 631          * possibly pending and take care of the matter below.
 632          */
 633         cancel_work_sync(&phydev->phy_queue);
 634         /*
 635          * If work indeed has been cancelled, disable_irq() will have
 636          * been left unbalanced from phy_interrupt() and enable_irq()
 637          * has to be called so that other devices on the line work.
 638          */
 639         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 640                 enable_irq(phydev->irq);
 641
 642         return err;
 643 }
 644 EXPORT_SYMBOL(phy_stop_interrupts);
 645
 646
 647 /**
 648  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 649  * @work: work_struct that describes the work to be done
 650  */
 651 static void phy_change(struct work_struct *work)
 652 {
 653         int err;
 654         struct phy_device *phydev =
 655                 container_of(work, struct phy_device, phy_queue);
 656
 657         if (phydev->drv->did_interrupt &&
 658             !phydev->drv->did_interrupt(phydev))
 659                 goto ignore;
 660
 661         err = phy_disable_interrupts(phydev);
 662
 663         if (err)
 664                 goto phy_err;
 665
 666         mutex_lock(&phydev->lock);
 667         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 668                 phydev->state = PHY_CHANGELINK;
 669         mutex_unlock(&phydev->lock);
 670
 671         atomic_dec(&phydev->irq_disable);
 672         enable_irq(phydev->irq);
 673
 674         /* Reenable interrupts */
 675         if (PHY_HALTED != phydev->state)
 676                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 677
 678         if (err)
 679                 goto irq_enable_err;
 680
 681         /* reschedule state queue work to run as soon as possible */
 682         cancel_delayed_work_sync(&phydev->state_queue);
 683         schedule_delayed_work(&phydev->state_queue, 0);
 684
 685         return;
 686
 687 ignore:
 688         atomic_dec(&phydev->irq_disable);
 689         enable_irq(phydev->irq);
 690         return;
 691
 692 irq_enable_err:
 693         disable_irq(phydev->irq);
 694         atomic_inc(&phydev->irq_disable);
 695 phy_err:
 696         phy_error(phydev);
 697 }
 698
 699 /**
 700  * phy_stop - Bring down the PHY link, and stop checking the status
 701  * @phydev: target phy_device struct
 702  */
 703 void phy_stop(struct phy_device *phydev)
 704 {
 705         mutex_lock(&phydev->lock);
 706
 707         if (PHY_HALTED == phydev->state)
 708                 goto out_unlock;
 709
 710         if (phydev->irq != PHY_POLL) {
 711                 /* Disable PHY Interrupts */
 712                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 713
 714                 /* Clear any pending interrupts */
 715                 phy_clear_interrupt(phydev);
 716         }
 717
 718         phydev->state = PHY_HALTED;
 719
 720 out_unlock:
 721         mutex_unlock(&phydev->lock);
 722
 723         /*
 724          * Cannot call flush_scheduled_work() here as desired because
 725          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 726          * will not reenable interrupts.
 727          */
 728 }
 729
 730
 731 /**
 732  * phy_start - start or restart a PHY device
 733  * @phydev: target phy_device struct
 734  *
 735  * Description: Indicates the attached device's readiness to
 736  *   handle PHY-related work.  Used during startup to start the
 737  *   PHY, and after a call to phy_stop() to resume operation.
 738  *   Also used to indicate the MDIO bus has cleared an error
 739  *   condition.
 740  */
 741 void phy_start(struct phy_device *phydev)
 742 {
 743         mutex_lock(&phydev->lock);
 744
 745         switch (phydev->state) {
 746                 case PHY_STARTING:
 747                         phydev->state = PHY_PENDING;
 748                         break;
 749                 case PHY_READY:
 750                         phydev->state = PHY_UP;
 751                         break;
 752                 case PHY_HALTED:
 753                         phydev->state = PHY_RESUMING;
 754                 default:
 755                         break;
 756         }
 757         mutex_unlock(&phydev->lock);
 758 }
 759 EXPORT_SYMBOL(phy_stop);
 760 EXPORT_SYMBOL(phy_start);
 761
 762 /**
 763  * phy_state_machine - Handle the state machine
 764  * @work: work_struct that describes the work to be done
 765  */
 766 void phy_state_machine(struct work_struct *work)
 767 {
 768         struct delayed_work *dwork = to_delayed_work(work);
 769         struct phy_device *phydev =
 770                         container_of(dwork, struct phy_device, state_queue);
 771         int needs_aneg = 0;
 772         int err = 0;
 773
 774         mutex_lock(&phydev->lock);
 775
 776         if (phydev->adjust_state)
 777                 phydev->adjust_state(phydev->attached_dev);
 778
 779         switch(phydev->state) {
 780                 case PHY_DOWN:
 781                 case PHY_STARTING:
 782                 case PHY_READY:
 783                 case PHY_PENDING:
 784                         break;
 785                 case PHY_UP:
 786                         needs_aneg = 1;
 787
 788                         phydev->link_timeout = PHY_AN_TIMEOUT;
 789
 790                         break;
 791                 case PHY_AN:
 792                         err = phy_read_status(phydev);
 793
 794                         if (err < 0)
 795                                 break;
 796
 797                         /* If the link is down, give up on
 798                          * negotiation for now */
 799                         if (!phydev->link) {
 800                                 phydev->state = PHY_NOLINK;
 801                                 netif_carrier_off(phydev->attached_dev);
 802                                 phydev->adjust_link(phydev->attached_dev);
 803                                 break;
 804                         }
 805
 806                         /* Check if negotiation is done.  Break
 807                          * if there's an error */
 808                         err = phy_aneg_done(phydev);
 809                         if (err < 0)
 810                                 break;
 811
 812                         /* If AN is done, we're running */
 813                         if (err > 0) {
 814                                 phydev->state = PHY_RUNNING;
 815                                 netif_carrier_on(phydev->attached_dev);
 816                                 phydev->adjust_link(phydev->attached_dev);
 817
 818                         } else if (0 == phydev->link_timeout--) {
 819                                 int idx;
 820
 821                                 needs_aneg = 1;
 822                                 /* If we have the magic_aneg bit,
 823                                  * we try again */
 824                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 825                                         break;
 826
 827                                 /* The timer expired, and we still
 828                                  * don't have a setting, so we try
 829                                  * forcing it until we find one that
 830                                  * works, starting from the fastest speed,
 831                                  * and working our way down */
 832                                 idx = phy_find_valid(0, phydev->supported);
 833
 834                                 phydev->speed = settings[idx].speed;
 835                                 phydev->duplex = settings[idx].duplex;
 836
 837                                 phydev->autoneg = AUTONEG_DISABLE;
 838
 839                                 pr_info("Trying %d/%s\n", phydev->speed,
 840                                                 DUPLEX_FULL ==
 841                                                 phydev->duplex ?
 842                                                 "FULL" : "HALF");
 843                         }
 844                         break;
 845                 case PHY_NOLINK:
 846                         err = phy_read_status(phydev);
 847
 848                         if (err)
 849                                 break;
 850
 851                         if (phydev->link) {
 852                                 phydev->state = PHY_RUNNING;
 853                                 netif_carrier_on(phydev->attached_dev);
 854                                 phydev->adjust_link(phydev->attached_dev);
 855                         }
 856                         break;
 857                 case PHY_FORCING:
 858                         err = genphy_update_link(phydev);
 859
 860                         if (err)
 861                                 break;
 862
 863                         if (phydev->link) {
 864                                 phydev->state = PHY_RUNNING;
 865                                 netif_carrier_on(phydev->attached_dev);
 866                         } else {
 867                                 if (0 == phydev->link_timeout--) {
 868                                         phy_force_reduction(phydev);
 869                                         needs_aneg = 1;
 870                                 }
 871                         }
 872
 873                         phydev->adjust_link(phydev->attached_dev);
 874                         break;
 875                 case PHY_RUNNING:
 876                         /* Only register a CHANGE if we are
 877                          * polling */
 878                         if (PHY_POLL == phydev->irq)
 879                                 phydev->state = PHY_CHANGELINK;
 880                         break;
 881                 case PHY_CHANGELINK:
 882                         err = phy_read_status(phydev);
 883
 884                         if (err)
 885                                 break;
 886
 887                         if (phydev->link) {
 888                                 phydev->state = PHY_RUNNING;
 889                                 netif_carrier_on(phydev->attached_dev);
 890                         } else {
 891                                 phydev->state = PHY_NOLINK;
 892                                 netif_carrier_off(phydev->attached_dev);
 893                         }
 894
 895                         phydev->adjust_link(phydev->attached_dev);
 896
 897                         if (PHY_POLL != phydev->irq)
 898                                 err = phy_config_interrupt(phydev,
 899                                                 PHY_INTERRUPT_ENABLED);
 900                         break;
 901                 case PHY_HALTED:
 902                         if (phydev->link) {
 903                                 phydev->link = 0;
 904                                 netif_carrier_off(phydev->attached_dev);
 905                                 phydev->adjust_link(phydev->attached_dev);
 906                         }
 907                         break;
 908                 case PHY_RESUMING:
 909
 910                         err = phy_clear_interrupt(phydev);
 911
 912                         if (err)
 913                                 break;
 914
 915                         err = phy_config_interrupt(phydev,
 916                                         PHY_INTERRUPT_ENABLED);
 917
 918                         if (err)
 919                                 break;
 920
 921                         if (AUTONEG_ENABLE == phydev->autoneg) {
 922                                 err = phy_aneg_done(phydev);
 923                                 if (err < 0)
 924                                         break;
 925
 926                                 /* err > 0 if AN is done.
 927                                  * Otherwise, it's 0, and we're
 928                                  * still waiting for AN */
 929                                 if (err > 0) {
 930                                         err = phy_read_status(phydev);
 931                                         if (err)
 932                                                 break;
 933
 934                                         if (phydev->link) {
 935                                                 phydev->state = PHY_RUNNING;
 936                                                 netif_carrier_on(phydev->attached_dev);
 937                                         } else
 938                                                 phydev->state = PHY_NOLINK;
 939                                         phydev->adjust_link(phydev->attached_dev);
 940                                 } else {
 941                                         phydev->state = PHY_AN;
 942                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 943                                 }
 944                         } else {
 945                                 err = phy_read_status(phydev);
 946                                 if (err)
 947                                         break;
 948
 949                                 if (phydev->link) {
 950                                         phydev->state = PHY_RUNNING;
 951                                         netif_carrier_on(phydev->attached_dev);
 952                                 } else
 953                                         phydev->state = PHY_NOLINK;
 954                                 phydev->adjust_link(phydev->attached_dev);
 955                         }
 956                         break;
 957         }
 958
 959         mutex_unlock(&phydev->lock);
 960
 961         if (needs_aneg)
 962                 err = phy_start_aneg(phydev);
 963
 964         if (err < 0)
 965                 phy_error(phydev);
 966
 967         schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
 968 }