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(" - %d/%s", phydev->speed,
  51                                 DUPLEX_FULL == phydev->duplex ?
  52                                 "Full" : "Half");
  53
  54         printk("\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 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 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 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 EXPORT_SYMBOL(phy_sanitize_settings);
 227
 228 /**
 229  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 230  * @phydev: target phy_device struct
 231  * @cmd: ethtool_cmd
 232  *
 233  * A few notes about parameter checking:
 234  * - We don't set port or transceiver, so we don't care what they
 235  *   were set to.
 236  * - phy_start_aneg() will make sure forced settings are sane, and
 237  *   choose the next best ones from the ones selected, so we don't
 238  *   care if ethtool tries to give us bad values.
 239  */
 240 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 241 {
 242         if (cmd->phy_address != phydev->addr)
 243                 return -EINVAL;
 244
 245         /* We make sure that we don't pass unsupported
 246          * values in to the PHY */
 247         cmd->advertising &= phydev->supported;
 248
 249         /* Verify the settings we care about. */
 250         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 251                 return -EINVAL;
 252
 253         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 254                 return -EINVAL;
 255
 256         if (cmd->autoneg == AUTONEG_DISABLE &&
 257             ((cmd->speed != SPEED_1000 &&
 258               cmd->speed != SPEED_100 &&
 259               cmd->speed != SPEED_10) ||
 260              (cmd->duplex != DUPLEX_HALF &&
 261               cmd->duplex != DUPLEX_FULL)))
 262                 return -EINVAL;
 263
 264         phydev->autoneg = cmd->autoneg;
 265
 266         phydev->speed = cmd->speed;
 267
 268         phydev->advertising = cmd->advertising;
 269
 270         if (AUTONEG_ENABLE == cmd->autoneg)
 271                 phydev->advertising |= ADVERTISED_Autoneg;
 272         else
 273                 phydev->advertising &= ~ADVERTISED_Autoneg;
 274
 275         phydev->duplex = cmd->duplex;
 276
 277         /* Restart the PHY */
 278         phy_start_aneg(phydev);
 279
 280         return 0;
 281 }
 282 EXPORT_SYMBOL(phy_ethtool_sset);
 283
 284 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 285 {
 286         cmd->supported = phydev->supported;
 287
 288         cmd->advertising = phydev->advertising;
 289
 290         cmd->speed = phydev->speed;
 291         cmd->duplex = phydev->duplex;
 292         cmd->port = PORT_MII;
 293         cmd->phy_address = phydev->addr;
 294         cmd->transceiver = XCVR_EXTERNAL;
 295         cmd->autoneg = phydev->autoneg;
 296
 297         return 0;
 298 }
 299 EXPORT_SYMBOL(phy_ethtool_gset);
 300
 301 /**
 302  * phy_mii_ioctl - generic PHY MII ioctl interface
 303  * @phydev: the phy_device struct
 304  * @mii_data: MII ioctl data
 305  * @cmd: ioctl cmd to execute
 306  *
 307  * Note that this function is currently incompatible with the
 308  * PHYCONTROL layer.  It changes registers without regard to
 309  * current state.  Use at own risk.
 310  */
 311 int phy_mii_ioctl(struct phy_device *phydev,
 312                 struct ifreq *ifr, int cmd)
 313 {
 314         struct mii_ioctl_data *mii_data = if_mii(ifr);
 315         u16 val = mii_data->val_in;
 316
 317         switch (cmd) {
 318         case SIOCGMIIPHY:
 319                 mii_data->phy_id = phydev->addr;
 320                 /* fall through */
 321
 322         case SIOCGMIIREG:
 323                 mii_data->val_out = phy_read(phydev, 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                 phy_write(phydev, mii_data->reg_num, val);
 355
 356                 if (mii_data->reg_num == MII_BMCR &&
 357                     val & BMCR_RESET &&
 358                     phydev->drv->config_init) {
 359                         phy_scan_fixups(phydev);
 360                         phydev->drv->config_init(phydev);
 361                 }
 362                 break;
 363
 364         case SIOCSHWTSTAMP:
 365                 if (phydev->drv->hwtstamp)
 366                         return phydev->drv->hwtstamp(phydev, ifr);
 367                 /* fall through */
 368
 369         default:
 370                 return -EOPNOTSUPP;
 371         }
 372
 373         return 0;
 374 }
 375 EXPORT_SYMBOL(phy_mii_ioctl);
 376
 377 /**
 378  * phy_start_aneg - start auto-negotiation for this PHY device
 379  * @phydev: the phy_device struct
 380  *
 381  * Description: Sanitizes the settings (if we're not autonegotiating
 382  *   them), and then calls the driver's config_aneg function.
 383  *   If the PHYCONTROL Layer is operating, we change the state to
 384  *   reflect the beginning of Auto-negotiation or forcing.
 385  */
 386 int phy_start_aneg(struct phy_device *phydev)
 387 {
 388         int err;
 389
 390         mutex_lock(&phydev->lock);
 391
 392         if (AUTONEG_DISABLE == phydev->autoneg)
 393                 phy_sanitize_settings(phydev);
 394
 395         err = phydev->drv->config_aneg(phydev);
 396
 397         if (err < 0)
 398                 goto out_unlock;
 399
 400         if (phydev->state != PHY_HALTED) {
 401                 if (AUTONEG_ENABLE == phydev->autoneg) {
 402                         phydev->state = PHY_AN;
 403                         phydev->link_timeout = PHY_AN_TIMEOUT;
 404                 } else {
 405                         phydev->state = PHY_FORCING;
 406                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 407                 }
 408         }
 409
 410 out_unlock:
 411         mutex_unlock(&phydev->lock);
 412         return err;
 413 }
 414 EXPORT_SYMBOL(phy_start_aneg);
 415
 416
 417 static void phy_change(struct work_struct *work);
 418
 419 /**
 420  * phy_start_machine - start PHY state machine tracking
 421  * @phydev: the phy_device struct
 422  * @handler: callback function for state change notifications
 423  *
 424  * Description: The PHY infrastructure can run a state machine
 425  *   which tracks whether the PHY is starting up, negotiating,
 426  *   etc.  This function starts the timer which tracks the state
 427  *   of the PHY.  If you want to be notified when the state changes,
 428  *   pass in the callback @handler, otherwise, pass NULL.  If you
 429  *   want to maintain your own state machine, do not call this
 430  *   function.
 431  */
 432 void phy_start_machine(struct phy_device *phydev,
 433                 void (*handler)(struct net_device *))
 434 {
 435         phydev->adjust_state = handler;
 436
 437         schedule_delayed_work(&phydev->state_queue, HZ);
 438 }
 439
 440 /**
 441  * phy_stop_machine - stop the PHY state machine tracking
 442  * @phydev: target phy_device struct
 443  *
 444  * Description: Stops the state machine timer, sets the state to UP
 445  *   (unless it wasn't up yet). This function must be called BEFORE
 446  *   phy_detach.
 447  */
 448 void phy_stop_machine(struct phy_device *phydev)
 449 {
 450         cancel_delayed_work_sync(&phydev->state_queue);
 451
 452         mutex_lock(&phydev->lock);
 453         if (phydev->state > PHY_UP)
 454                 phydev->state = PHY_UP;
 455         mutex_unlock(&phydev->lock);
 456
 457         phydev->adjust_state = NULL;
 458 }
 459
 460 /**
 461  * phy_force_reduction - reduce PHY speed/duplex settings by one step
 462  * @phydev: target phy_device struct
 463  *
 464  * Description: Reduces the speed/duplex settings by one notch,
 465  *   in this order--
 466  *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 467  *   The function bottoms out at 10/HALF.
 468  */
 469 static void phy_force_reduction(struct phy_device *phydev)
 470 {
 471         int idx;
 472
 473         idx = phy_find_setting(phydev->speed, phydev->duplex);
 474
 475         idx++;
 476
 477         idx = phy_find_valid(idx, phydev->supported);
 478
 479         phydev->speed = settings[idx].speed;
 480         phydev->duplex = settings[idx].duplex;
 481
 482         pr_info("Trying %d/%s\n", phydev->speed,
 483                         DUPLEX_FULL == phydev->duplex ?
 484                         "FULL" : "HALF");
 485 }
 486
 487
 488 /**
 489  * phy_error - enter HALTED state for this PHY device
 490  * @phydev: target phy_device struct
 491  *
 492  * Moves the PHY to the HALTED state in response to a read
 493  * or write error, and tells the controller the link is down.
 494  * Must not be called from interrupt context, or while the
 495  * phydev->lock is held.
 496  */
 497 static void phy_error(struct phy_device *phydev)
 498 {
 499         mutex_lock(&phydev->lock);
 500         phydev->state = PHY_HALTED;
 501         mutex_unlock(&phydev->lock);
 502 }
 503
 504 /**
 505  * phy_interrupt - PHY interrupt handler
 506  * @irq: interrupt line
 507  * @phy_dat: phy_device pointer
 508  *
 509  * Description: When a PHY interrupt occurs, the handler disables
 510  * interrupts, and schedules a work task to clear the interrupt.
 511  */
 512 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 513 {
 514         struct phy_device *phydev = phy_dat;
 515
 516         if (PHY_HALTED == phydev->state)
 517                 return IRQ_NONE;                /* It can't be ours.  */
 518
 519         /* The MDIO bus is not allowed to be written in interrupt
 520          * context, so we need to disable the irq here.  A work
 521          * queue will write the PHY to disable and clear the
 522          * interrupt, and then reenable the irq line. */
 523         disable_irq_nosync(irq);
 524         atomic_inc(&phydev->irq_disable);
 525
 526         schedule_work(&phydev->phy_queue);
 527
 528         return IRQ_HANDLED;
 529 }
 530
 531 /**
 532  * phy_enable_interrupts - Enable the interrupts from the PHY side
 533  * @phydev: target phy_device struct
 534  */
 535 int phy_enable_interrupts(struct phy_device *phydev)
 536 {
 537         int err;
 538
 539         err = phy_clear_interrupt(phydev);
 540
 541         if (err < 0)
 542                 return err;
 543
 544         err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 545
 546         return err;
 547 }
 548 EXPORT_SYMBOL(phy_enable_interrupts);
 549
 550 /**
 551  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 552  * @phydev: target phy_device struct
 553  */
 554 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 EXPORT_SYMBOL(phy_disable_interrupts);
 578
 579 /**
 580  * phy_start_interrupts - request and enable interrupts for a PHY device
 581  * @phydev: target phy_device struct
 582  *
 583  * Description: Request the interrupt for the given PHY.
 584  *   If this fails, then we set irq to PHY_POLL.
 585  *   Otherwise, we enable the interrupts in the PHY.
 586  *   This should only be called with a valid IRQ number.
 587  *   Returns 0 on success or < 0 on error.
 588  */
 589 int phy_start_interrupts(struct phy_device *phydev)
 590 {
 591         int err = 0;
 592
 593         INIT_WORK(&phydev->phy_queue, phy_change);
 594
 595         atomic_set(&phydev->irq_disable, 0);
 596         if (request_irq(phydev->irq, phy_interrupt,
 597                                 IRQF_SHARED,
 598                                 "phy_interrupt",
 599                                 phydev) < 0) {
 600                 printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 601                                 phydev->bus->name,
 602                                 phydev->irq);
 603                 phydev->irq = PHY_POLL;
 604                 return 0;
 605         }
 606
 607         err = phy_enable_interrupts(phydev);
 608
 609         return err;
 610 }
 611 EXPORT_SYMBOL(phy_start_interrupts);
 612
 613 /**
 614  * phy_stop_interrupts - disable interrupts from a PHY device
 615  * @phydev: target phy_device struct
 616  */
 617 int phy_stop_interrupts(struct phy_device *phydev)
 618 {
 619         int err;
 620
 621         err = phy_disable_interrupts(phydev);
 622
 623         if (err)
 624                 phy_error(phydev);
 625
 626         free_irq(phydev->irq, phydev);
 627
 628         /*
 629          * Cannot call flush_scheduled_work() here as desired because
 630          * of rtnl_lock(), but we do not really care about what would
 631          * be done, except from enable_irq(), so cancel any work
 632          * possibly pending and take care of the matter below.
 633          */
 634         cancel_work_sync(&phydev->phy_queue);
 635         /*
 636          * If work indeed has been cancelled, disable_irq() will have
 637          * been left unbalanced from phy_interrupt() and enable_irq()
 638          * has to be called so that other devices on the line work.
 639          */
 640         while (atomic_dec_return(&phydev->irq_disable) >= 0)
 641                 enable_irq(phydev->irq);
 642
 643         return err;
 644 }
 645 EXPORT_SYMBOL(phy_stop_interrupts);
 646
 647
 648 /**
 649  * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 650  * @work: work_struct that describes the work to be done
 651  */
 652 static void phy_change(struct work_struct *work)
 653 {
 654         int err;
 655         struct phy_device *phydev =
 656                 container_of(work, struct phy_device, phy_queue);
 657
 658         if (phydev->drv->did_interrupt &&
 659             !phydev->drv->did_interrupt(phydev))
 660                 goto ignore;
 661
 662         err = phy_disable_interrupts(phydev);
 663
 664         if (err)
 665                 goto phy_err;
 666
 667         mutex_lock(&phydev->lock);
 668         if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 669                 phydev->state = PHY_CHANGELINK;
 670         mutex_unlock(&phydev->lock);
 671
 672         atomic_dec(&phydev->irq_disable);
 673         enable_irq(phydev->irq);
 674
 675         /* Reenable interrupts */
 676         if (PHY_HALTED != phydev->state)
 677                 err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 678
 679         if (err)
 680                 goto irq_enable_err;
 681
 682         /* reschedule state queue work to run as soon as possible */
 683         cancel_delayed_work_sync(&phydev->state_queue);
 684         schedule_delayed_work(&phydev->state_queue, 0);
 685
 686         return;
 687
 688 ignore:
 689         atomic_dec(&phydev->irq_disable);
 690         enable_irq(phydev->irq);
 691         return;
 692
 693 irq_enable_err:
 694         disable_irq(phydev->irq);
 695         atomic_inc(&phydev->irq_disable);
 696 phy_err:
 697         phy_error(phydev);
 698 }
 699
 700 /**
 701  * phy_stop - Bring down the PHY link, and stop checking the status
 702  * @phydev: target phy_device struct
 703  */
 704 void phy_stop(struct phy_device *phydev)
 705 {
 706         mutex_lock(&phydev->lock);
 707
 708         if (PHY_HALTED == phydev->state)
 709                 goto out_unlock;
 710
 711         if (phydev->irq != PHY_POLL) {
 712                 /* Disable PHY Interrupts */
 713                 phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 714
 715                 /* Clear any pending interrupts */
 716                 phy_clear_interrupt(phydev);
 717         }
 718
 719         phydev->state = PHY_HALTED;
 720
 721 out_unlock:
 722         mutex_unlock(&phydev->lock);
 723
 724         /*
 725          * Cannot call flush_scheduled_work() here as desired because
 726          * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 727          * will not reenable interrupts.
 728          */
 729 }
 730
 731
 732 /**
 733  * phy_start - start or restart a PHY device
 734  * @phydev: target phy_device struct
 735  *
 736  * Description: Indicates the attached device's readiness to
 737  *   handle PHY-related work.  Used during startup to start the
 738  *   PHY, and after a call to phy_stop() to resume operation.
 739  *   Also used to indicate the MDIO bus has cleared an error
 740  *   condition.
 741  */
 742 void phy_start(struct phy_device *phydev)
 743 {
 744         mutex_lock(&phydev->lock);
 745
 746         switch (phydev->state) {
 747                 case PHY_STARTING:
 748                         phydev->state = PHY_PENDING;
 749                         break;
 750                 case PHY_READY:
 751                         phydev->state = PHY_UP;
 752                         break;
 753                 case PHY_HALTED:
 754                         phydev->state = PHY_RESUMING;
 755                 default:
 756                         break;
 757         }
 758         mutex_unlock(&phydev->lock);
 759 }
 760 EXPORT_SYMBOL(phy_stop);
 761 EXPORT_SYMBOL(phy_start);
 762
 763 /**
 764  * phy_state_machine - Handle the state machine
 765  * @work: work_struct that describes the work to be done
 766  */
 767 void phy_state_machine(struct work_struct *work)
 768 {
 769         struct delayed_work *dwork = to_delayed_work(work);
 770         struct phy_device *phydev =
 771                         container_of(dwork, struct phy_device, state_queue);
 772         int needs_aneg = 0;
 773         int err = 0;
 774
 775         mutex_lock(&phydev->lock);
 776
 777         if (phydev->adjust_state)
 778                 phydev->adjust_state(phydev->attached_dev);
 779
 780         switch(phydev->state) {
 781                 case PHY_DOWN:
 782                 case PHY_STARTING:
 783                 case PHY_READY:
 784                 case PHY_PENDING:
 785                         break;
 786                 case PHY_UP:
 787                         needs_aneg = 1;
 788
 789                         phydev->link_timeout = PHY_AN_TIMEOUT;
 790
 791                         break;
 792                 case PHY_AN:
 793                         err = phy_read_status(phydev);
 794
 795                         if (err < 0)
 796                                 break;
 797
 798                         /* If the link is down, give up on
 799                          * negotiation for now */
 800                         if (!phydev->link) {
 801                                 phydev->state = PHY_NOLINK;
 802                                 netif_carrier_off(phydev->attached_dev);
 803                                 phydev->adjust_link(phydev->attached_dev);
 804                                 break;
 805                         }
 806
 807                         /* Check if negotiation is done.  Break
 808                          * if there's an error */
 809                         err = phy_aneg_done(phydev);
 810                         if (err < 0)
 811                                 break;
 812
 813                         /* If AN is done, we're running */
 814                         if (err > 0) {
 815                                 phydev->state = PHY_RUNNING;
 816                                 netif_carrier_on(phydev->attached_dev);
 817                                 phydev->adjust_link(phydev->attached_dev);
 818
 819                         } else if (0 == phydev->link_timeout--) {
 820                                 int idx;
 821
 822                                 needs_aneg = 1;
 823                                 /* If we have the magic_aneg bit,
 824                                  * we try again */
 825                                 if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 826                                         break;
 827
 828                                 /* The timer expired, and we still
 829                                  * don't have a setting, so we try
 830                                  * forcing it until we find one that
 831                                  * works, starting from the fastest speed,
 832                                  * and working our way down */
 833                                 idx = phy_find_valid(0, phydev->supported);
 834
 835                                 phydev->speed = settings[idx].speed;
 836                                 phydev->duplex = settings[idx].duplex;
 837
 838                                 phydev->autoneg = AUTONEG_DISABLE;
 839
 840                                 pr_info("Trying %d/%s\n", phydev->speed,
 841                                                 DUPLEX_FULL ==
 842                                                 phydev->duplex ?
 843                                                 "FULL" : "HALF");
 844                         }
 845                         break;
 846                 case PHY_NOLINK:
 847                         err = phy_read_status(phydev);
 848
 849                         if (err)
 850                                 break;
 851
 852                         if (phydev->link) {
 853                                 phydev->state = PHY_RUNNING;
 854                                 netif_carrier_on(phydev->attached_dev);
 855                                 phydev->adjust_link(phydev->attached_dev);
 856                         }
 857                         break;
 858                 case PHY_FORCING:
 859                         err = genphy_update_link(phydev);
 860
 861                         if (err)
 862                                 break;
 863
 864                         if (phydev->link) {
 865                                 phydev->state = PHY_RUNNING;
 866                                 netif_carrier_on(phydev->attached_dev);
 867                         } else {
 868                                 if (0 == phydev->link_timeout--) {
 869                                         phy_force_reduction(phydev);
 870                                         needs_aneg = 1;
 871                                 }
 872                         }
 873
 874                         phydev->adjust_link(phydev->attached_dev);
 875                         break;
 876                 case PHY_RUNNING:
 877                         /* Only register a CHANGE if we are
 878                          * polling */
 879                         if (PHY_POLL == phydev->irq)
 880                                 phydev->state = PHY_CHANGELINK;
 881                         break;
 882                 case PHY_CHANGELINK:
 883                         err = phy_read_status(phydev);
 884
 885                         if (err)
 886                                 break;
 887
 888                         if (phydev->link) {
 889                                 phydev->state = PHY_RUNNING;
 890                                 netif_carrier_on(phydev->attached_dev);
 891                         } else {
 892                                 phydev->state = PHY_NOLINK;
 893                                 netif_carrier_off(phydev->attached_dev);
 894                         }
 895
 896                         phydev->adjust_link(phydev->attached_dev);
 897
 898                         if (PHY_POLL != phydev->irq)
 899                                 err = phy_config_interrupt(phydev,
 900                                                 PHY_INTERRUPT_ENABLED);
 901                         break;
 902                 case PHY_HALTED:
 903                         if (phydev->link) {
 904                                 phydev->link = 0;
 905                                 netif_carrier_off(phydev->attached_dev);
 906                                 phydev->adjust_link(phydev->attached_dev);
 907                         }
 908                         break;
 909                 case PHY_RESUMING:
 910
 911                         err = phy_clear_interrupt(phydev);
 912
 913                         if (err)
 914                                 break;
 915
 916                         err = phy_config_interrupt(phydev,
 917                                         PHY_INTERRUPT_ENABLED);
 918
 919                         if (err)
 920                                 break;
 921
 922                         if (AUTONEG_ENABLE == phydev->autoneg) {
 923                                 err = phy_aneg_done(phydev);
 924                                 if (err < 0)
 925                                         break;
 926
 927                                 /* err > 0 if AN is done.
 928                                  * Otherwise, it's 0, and we're
 929                                  * still waiting for AN */
 930                                 if (err > 0) {
 931                                         err = phy_read_status(phydev);
 932                                         if (err)
 933                                                 break;
 934
 935                                         if (phydev->link) {
 936                                                 phydev->state = PHY_RUNNING;
 937                                                 netif_carrier_on(phydev->attached_dev);
 938                                         } else
 939                                                 phydev->state = PHY_NOLINK;
 940                                         phydev->adjust_link(phydev->attached_dev);
 941                                 } else {
 942                                         phydev->state = PHY_AN;
 943                                         phydev->link_timeout = PHY_AN_TIMEOUT;
 944                                 }
 945                         } else {
 946                                 err = phy_read_status(phydev);
 947                                 if (err)
 948                                         break;
 949
 950                                 if (phydev->link) {
 951                                         phydev->state = PHY_RUNNING;
 952                                         netif_carrier_on(phydev->attached_dev);
 953                                 } else
 954                                         phydev->state = PHY_NOLINK;
 955                                 phydev->adjust_link(phydev->attached_dev);
 956                         }
 957                         break;
 958         }
 959
 960         mutex_unlock(&phydev->lock);
 961
 962         if (needs_aneg)
 963                 err = phy_start_aneg(phydev);
 964
 965         if (err < 0)
 966                 phy_error(phydev);
 967
 968         schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
 969 }