drivers/net/phy/phy_device.c

   1 /*
   2  * drivers/net/phy/phy_device.c
   3  *
   4  * Framework for finding and configuring PHYs.
   5  * Also contains generic PHY driver
   6  *
   7  * Author: Andy Fleming
   8  *
   9  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19 #include <linux/errno.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.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
  34 #include <asm/io.h>
  35 #include <asm/irq.h>
  36 #include <asm/uaccess.h>
  37
  38 MODULE_DESCRIPTION("PHY library");
  39 MODULE_AUTHOR("Andy Fleming");
  40 MODULE_LICENSE("GPL");
  41
  42 void phy_device_free(struct phy_device *phydev)
  43 {
  44         kfree(phydev);
  45 }
  46 EXPORT_SYMBOL(phy_device_free);
  47
  48 static void phy_device_release(struct device *dev)
  49 {
  50         phy_device_free(to_phy_device(dev));
  51 }
  52
  53 static struct phy_driver genphy_driver;
  54 extern int mdio_bus_init(void);
  55 extern void mdio_bus_exit(void);
  56
  57 static LIST_HEAD(phy_fixup_list);
  58 static DEFINE_MUTEX(phy_fixup_lock);
  59
  60 /*
  61  * Creates a new phy_fixup and adds it to the list
  62  * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID)
  63  * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
  64  *      It can also be PHY_ANY_UID
  65  * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
  66  *      comparison
  67  * @run: The actual code to be run when a matching PHY is found
  68  */
  69 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
  70                 int (*run)(struct phy_device *))
  71 {
  72         struct phy_fixup *fixup;
  73
  74         fixup = kzalloc(sizeof(struct phy_fixup), GFP_KERNEL);
  75         if (!fixup)
  76                 return -ENOMEM;
  77
  78         strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
  79         fixup->phy_uid = phy_uid;
  80         fixup->phy_uid_mask = phy_uid_mask;
  81         fixup->run = run;
  82
  83         mutex_lock(&phy_fixup_lock);
  84         list_add_tail(&fixup->list, &phy_fixup_list);
  85         mutex_unlock(&phy_fixup_lock);
  86
  87         return 0;
  88 }
  89 EXPORT_SYMBOL(phy_register_fixup);
  90
  91 /* Registers a fixup to be run on any PHY with the UID in phy_uid */
  92 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
  93                 int (*run)(struct phy_device *))
  94 {
  95         return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
  96 }
  97 EXPORT_SYMBOL(phy_register_fixup_for_uid);
  98
  99 /* Registers a fixup to be run on the PHY with id string bus_id */
 100 int phy_register_fixup_for_id(const char *bus_id,
 101                 int (*run)(struct phy_device *))
 102 {
 103         return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
 104 }
 105 EXPORT_SYMBOL(phy_register_fixup_for_id);
 106
 107 /*
 108  * Returns 1 if fixup matches phydev in bus_id and phy_uid.
 109  * Fixups can be set to match any in one or more fields.
 110  */
 111 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
 112 {
 113         if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0)
 114                 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
 115                         return 0;
 116
 117         if ((fixup->phy_uid & fixup->phy_uid_mask) !=
 118                         (phydev->phy_id & fixup->phy_uid_mask))
 119                 if (fixup->phy_uid != PHY_ANY_UID)
 120                         return 0;
 121
 122         return 1;
 123 }
 124
 125 /* Runs any matching fixups for this phydev */
 126 int phy_scan_fixups(struct phy_device *phydev)
 127 {
 128         struct phy_fixup *fixup;
 129
 130         mutex_lock(&phy_fixup_lock);
 131         list_for_each_entry(fixup, &phy_fixup_list, list) {
 132                 if (phy_needs_fixup(phydev, fixup)) {
 133                         int err;
 134
 135                         err = fixup->run(phydev);
 136
 137                         if (err < 0)
 138                                 return err;
 139                 }
 140         }
 141         mutex_unlock(&phy_fixup_lock);
 142
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(phy_scan_fixups);
 146
 147 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
 148 {
 149         struct phy_device *dev;
 150         /* We allocate the device, and initialize the
 151          * default values */
 152         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 153
 154         if (NULL == dev)
 155                 return (struct phy_device*) PTR_ERR((void*)-ENOMEM);
 156
 157         dev->dev.release = phy_device_release;
 158
 159         dev->speed = 0;
 160         dev->duplex = -1;
 161         dev->pause = dev->asym_pause = 0;
 162         dev->link = 1;
 163         dev->interface = PHY_INTERFACE_MODE_GMII;
 164
 165         dev->autoneg = AUTONEG_ENABLE;
 166
 167         dev->addr = addr;
 168         dev->phy_id = phy_id;
 169         dev->bus = bus;
 170         dev->dev.parent = bus->parent;
 171         dev->dev.bus = &mdio_bus_type;
 172         dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
 173         dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
 174
 175         dev->state = PHY_DOWN;
 176
 177         mutex_init(&dev->lock);
 178
 179         return dev;
 180 }
 181 EXPORT_SYMBOL(phy_device_create);
 182
 183 /**
 184  * get_phy_id - reads the specified addr for its ID.
 185  * @bus: the target MII bus
 186  * @addr: PHY address on the MII bus
 187  * @phy_id: where to store the ID retrieved.
 188  *
 189  * Description: Reads the ID registers of the PHY at @addr on the
 190  *   @bus, stores it in @phy_id and returns zero on success.
 191  */
 192 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
 193 {
 194         int phy_reg;
 195
 196         /* Grab the bits from PHYIR1, and put them
 197          * in the upper half */
 198         phy_reg = bus->read(bus, addr, MII_PHYSID1);
 199
 200         if (phy_reg < 0)
 201                 return -EIO;
 202
 203         *phy_id = (phy_reg & 0xffff) << 16;
 204
 205         /* Grab the bits from PHYIR2, and put them in the lower half */
 206         phy_reg = bus->read(bus, addr, MII_PHYSID2);
 207
 208         if (phy_reg < 0)
 209                 return -EIO;
 210
 211         *phy_id |= (phy_reg & 0xffff);
 212
 213         return 0;
 214 }
 215 EXPORT_SYMBOL(get_phy_id);
 216
 217 /**
 218  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
 219  * @bus: the target MII bus
 220  * @addr: PHY address on the MII bus
 221  *
 222  * Description: Reads the ID registers of the PHY at @addr on the
 223  *   @bus, then allocates and returns the phy_device to represent it.
 224  */
 225 struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
 226 {
 227         struct phy_device *dev = NULL;
 228         u32 phy_id;
 229         int r;
 230
 231         r = get_phy_id(bus, addr, &phy_id);
 232         if (r)
 233                 return ERR_PTR(r);
 234
 235         /* If the phy_id is mostly Fs, there is no device there */
 236         if ((phy_id & 0x1fffffff) == 0x1fffffff)
 237                 return NULL;
 238
 239         dev = phy_device_create(bus, addr, phy_id);
 240
 241         return dev;
 242 }
 243 EXPORT_SYMBOL(get_phy_device);
 244
 245 /**
 246  * phy_device_register - Register the phy device on the MDIO bus
 247  * @phydev: phy_device structure to be added to the MDIO bus
 248  */
 249 int phy_device_register(struct phy_device *phydev)
 250 {
 251         int err;
 252
 253         /* Don't register a phy if one is already registered at this
 254          * address */
 255         if (phydev->bus->phy_map[phydev->addr])
 256                 return -EINVAL;
 257         phydev->bus->phy_map[phydev->addr] = phydev;
 258
 259         /* Run all of the fixups for this PHY */
 260         phy_scan_fixups(phydev);
 261
 262         err = device_register(&phydev->dev);
 263         if (err) {
 264                 pr_err("phy %d failed to register\n", phydev->addr);
 265                 goto out;
 266         }
 267
 268         return 0;
 269
 270  out:
 271         phydev->bus->phy_map[phydev->addr] = NULL;
 272         return err;
 273 }
 274 EXPORT_SYMBOL(phy_device_register);
 275
 276 /**
 277  * phy_prepare_link - prepares the PHY layer to monitor link status
 278  * @phydev: target phy_device struct
 279  * @handler: callback function for link status change notifications
 280  *
 281  * Description: Tells the PHY infrastructure to handle the
 282  *   gory details on monitoring link status (whether through
 283  *   polling or an interrupt), and to call back to the
 284  *   connected device driver when the link status changes.
 285  *   If you want to monitor your own link state, don't call
 286  *   this function.
 287  */
 288 void phy_prepare_link(struct phy_device *phydev,
 289                 void (*handler)(struct net_device *))
 290 {
 291         phydev->adjust_link = handler;
 292 }
 293
 294 /**
 295  * phy_connect_direct - connect an ethernet device to a specific phy_device
 296  * @dev: the network device to connect
 297  * @phydev: the pointer to the phy device
 298  * @handler: callback function for state change notifications
 299  * @flags: PHY device's dev_flags
 300  * @interface: PHY device's interface
 301  */
 302 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 303                        void (*handler)(struct net_device *), u32 flags,
 304                        phy_interface_t interface)
 305 {
 306         int rc;
 307
 308         rc = phy_attach_direct(dev, phydev, flags, interface);
 309         if (rc)
 310                 return rc;
 311
 312         phy_prepare_link(phydev, handler);
 313         phy_start_machine(phydev, NULL);
 314         if (phydev->irq > 0)
 315                 phy_start_interrupts(phydev);
 316
 317         return 0;
 318 }
 319 EXPORT_SYMBOL(phy_connect_direct);
 320
 321 /**
 322  * phy_connect - connect an ethernet device to a PHY device
 323  * @dev: the network device to connect
 324  * @bus_id: the id string of the PHY device to connect
 325  * @handler: callback function for state change notifications
 326  * @flags: PHY device's dev_flags
 327  * @interface: PHY device's interface
 328  *
 329  * Description: Convenience function for connecting ethernet
 330  *   devices to PHY devices.  The default behavior is for
 331  *   the PHY infrastructure to handle everything, and only notify
 332  *   the connected driver when the link status changes.  If you
 333  *   don't want, or can't use the provided functionality, you may
 334  *   choose to call only the subset of functions which provide
 335  *   the desired functionality.
 336  */
 337 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 338                 void (*handler)(struct net_device *), u32 flags,
 339                 phy_interface_t interface)
 340 {
 341         struct phy_device *phydev;
 342         struct device *d;
 343         int rc;
 344
 345         /* Search the list of PHY devices on the mdio bus for the
 346          * PHY with the requested name */
 347         d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
 348         if (!d) {
 349                 pr_err("PHY %s not found\n", bus_id);
 350                 return ERR_PTR(-ENODEV);
 351         }
 352         phydev = to_phy_device(d);
 353
 354         rc = phy_connect_direct(dev, phydev, handler, flags, interface);
 355         if (rc)
 356                 return ERR_PTR(rc);
 357
 358         return phydev;
 359 }
 360 EXPORT_SYMBOL(phy_connect);
 361
 362 /**
 363  * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device
 364  * @phydev: target phy_device struct
 365  */
 366 void phy_disconnect(struct phy_device *phydev)
 367 {
 368         if (phydev->irq > 0)
 369                 phy_stop_interrupts(phydev);
 370
 371         phy_stop_machine(phydev);
 372
 373         phydev->adjust_link = NULL;
 374
 375         phy_detach(phydev);
 376 }
 377 EXPORT_SYMBOL(phy_disconnect);
 378
 379 /**
 380  * phy_attach_direct - attach a network device to a given PHY device pointer
 381  * @dev: network device to attach
 382  * @phydev: Pointer to phy_device to attach
 383  * @flags: PHY device's dev_flags
 384  * @interface: PHY device's interface
 385  *
 386  * Description: Called by drivers to attach to a particular PHY
 387  *     device. The phy_device is found, and properly hooked up
 388  *     to the phy_driver.  If no driver is attached, then the
 389  *     genphy_driver is used.  The phy_device is given a ptr to
 390  *     the attaching device, and given a callback for link status
 391  *     change.  The phy_device is returned to the attaching driver.
 392  */
 393 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 394                       u32 flags, phy_interface_t interface)
 395 {
 396         struct device *d = &phydev->dev;
 397
 398         /* Assume that if there is no driver, that it doesn't
 399          * exist, and we should use the genphy driver. */
 400         if (NULL == d->driver) {
 401                 int err;
 402                 d->driver = &genphy_driver.driver;
 403
 404                 err = d->driver->probe(d);
 405                 if (err >= 0)
 406                         err = device_bind_driver(d);
 407
 408                 if (err)
 409                         return err;
 410         }
 411
 412         if (phydev->attached_dev) {
 413                 dev_err(&dev->dev, "PHY already attached\n");
 414                 return -EBUSY;
 415         }
 416
 417         phydev->attached_dev = dev;
 418
 419         phydev->dev_flags = flags;
 420
 421         phydev->interface = interface;
 422
 423         /* Do initial configuration here, now that
 424          * we have certain key parameters
 425          * (dev_flags and interface) */
 426         if (phydev->drv->config_init) {
 427                 int err;
 428
 429                 err = phy_scan_fixups(phydev);
 430
 431                 if (err < 0)
 432                         return err;
 433
 434                 err = phydev->drv->config_init(phydev);
 435
 436                 if (err < 0)
 437                         return err;
 438         }
 439
 440         return 0;
 441 }
 442 EXPORT_SYMBOL(phy_attach_direct);
 443
 444 /**
 445  * phy_attach - attach a network device to a particular PHY device
 446  * @dev: network device to attach
 447  * @bus_id: Bus ID of PHY device to attach
 448  * @flags: PHY device's dev_flags
 449  * @interface: PHY device's interface
 450  *
 451  * Description: Same as phy_attach_direct() except that a PHY bus_id
 452  *     string is passed instead of a pointer to a struct phy_device.
 453  */
 454 struct phy_device *phy_attach(struct net_device *dev,
 455                 const char *bus_id, u32 flags, phy_interface_t interface)
 456 {
 457         struct bus_type *bus = &mdio_bus_type;
 458         struct phy_device *phydev;
 459         struct device *d;
 460         int rc;
 461
 462         /* Search the list of PHY devices on the mdio bus for the
 463          * PHY with the requested name */
 464         d = bus_find_device_by_name(bus, NULL, bus_id);
 465         if (!d) {
 466                 pr_err("PHY %s not found\n", bus_id);
 467                 return ERR_PTR(-ENODEV);
 468         }
 469         phydev = to_phy_device(d);
 470
 471         rc = phy_attach_direct(dev, phydev, flags, interface);
 472         if (rc)
 473                 return ERR_PTR(rc);
 474
 475         return phydev;
 476 }
 477 EXPORT_SYMBOL(phy_attach);
 478
 479 /**
 480  * phy_detach - detach a PHY device from its network device
 481  * @phydev: target phy_device struct
 482  */
 483 void phy_detach(struct phy_device *phydev)
 484 {
 485         phydev->attached_dev = NULL;
 486
 487         /* If the device had no specific driver before (i.e. - it
 488          * was using the generic driver), we unbind the device
 489          * from the generic driver so that there's a chance a
 490          * real driver could be loaded */
 491         if (phydev->dev.driver == &genphy_driver.driver)
 492                 device_release_driver(&phydev->dev);
 493 }
 494 EXPORT_SYMBOL(phy_detach);
 495
 496
 497 /* Generic PHY support and helper functions */
 498
 499 /**
 500  * genphy_config_advert - sanitize and advertise auto-negotation parameters
 501  * @phydev: target phy_device struct
 502  *
 503  * Description: Writes MII_ADVERTISE with the appropriate values,
 504  *   after sanitizing the values to make sure we only advertise
 505  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
 506  *   hasn't changed, and > 0 if it has changed.
 507  */
 508 int genphy_config_advert(struct phy_device *phydev)
 509 {
 510         u32 advertise;
 511         int oldadv, adv;
 512         int err, changed = 0;
 513
 514         /* Only allow advertising what
 515          * this PHY supports */
 516         phydev->advertising &= phydev->supported;
 517         advertise = phydev->advertising;
 518
 519         /* Setup standard advertisement */
 520         oldadv = adv = phy_read(phydev, MII_ADVERTISE);
 521
 522         if (adv < 0)
 523                 return adv;
 524
 525         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
 526                  ADVERTISE_PAUSE_ASYM);
 527         if (advertise & ADVERTISED_10baseT_Half)
 528                 adv |= ADVERTISE_10HALF;
 529         if (advertise & ADVERTISED_10baseT_Full)
 530                 adv |= ADVERTISE_10FULL;
 531         if (advertise & ADVERTISED_100baseT_Half)
 532                 adv |= ADVERTISE_100HALF;
 533         if (advertise & ADVERTISED_100baseT_Full)
 534                 adv |= ADVERTISE_100FULL;
 535         if (advertise & ADVERTISED_Pause)
 536                 adv |= ADVERTISE_PAUSE_CAP;
 537         if (advertise & ADVERTISED_Asym_Pause)
 538                 adv |= ADVERTISE_PAUSE_ASYM;
 539
 540         if (adv != oldadv) {
 541                 err = phy_write(phydev, MII_ADVERTISE, adv);
 542
 543                 if (err < 0)
 544                         return err;
 545                 changed = 1;
 546         }
 547
 548         /* Configure gigabit if it's supported */
 549         if (phydev->supported & (SUPPORTED_1000baseT_Half |
 550                                 SUPPORTED_1000baseT_Full)) {
 551                 oldadv = adv = phy_read(phydev, MII_CTRL1000);
 552
 553                 if (adv < 0)
 554                         return adv;
 555
 556                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
 557                 if (advertise & SUPPORTED_1000baseT_Half)
 558                         adv |= ADVERTISE_1000HALF;
 559                 if (advertise & SUPPORTED_1000baseT_Full)
 560                         adv |= ADVERTISE_1000FULL;
 561
 562                 if (adv != oldadv) {
 563                         err = phy_write(phydev, MII_CTRL1000, adv);
 564
 565                         if (err < 0)
 566                                 return err;
 567                         changed = 1;
 568                 }
 569         }
 570
 571         return changed;
 572 }
 573 EXPORT_SYMBOL(genphy_config_advert);
 574
 575 /**
 576  * genphy_setup_forced - configures/forces speed/duplex from @phydev
 577  * @phydev: target phy_device struct
 578  *
 579  * Description: Configures MII_BMCR to force speed/duplex
 580  *   to the values in phydev. Assumes that the values are valid.
 581  *   Please see phy_sanitize_settings().
 582  */
 583 int genphy_setup_forced(struct phy_device *phydev)
 584 {
 585         int err;
 586         int ctl = 0;
 587
 588         phydev->pause = phydev->asym_pause = 0;
 589
 590         if (SPEED_1000 == phydev->speed)
 591                 ctl |= BMCR_SPEED1000;
 592         else if (SPEED_100 == phydev->speed)
 593                 ctl |= BMCR_SPEED100;
 594
 595         if (DUPLEX_FULL == phydev->duplex)
 596                 ctl |= BMCR_FULLDPLX;
 597
 598         err = phy_write(phydev, MII_BMCR, ctl);
 599
 600         return err;
 601 }
 602
 603
 604 /**
 605  * genphy_restart_aneg - Enable and Restart Autonegotiation
 606  * @phydev: target phy_device struct
 607  */
 608 int genphy_restart_aneg(struct phy_device *phydev)
 609 {
 610         int ctl;
 611
 612         ctl = phy_read(phydev, MII_BMCR);
 613
 614         if (ctl < 0)
 615                 return ctl;
 616
 617         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 618
 619         /* Don't isolate the PHY if we're negotiating */
 620         ctl &= ~(BMCR_ISOLATE);
 621
 622         ctl = phy_write(phydev, MII_BMCR, ctl);
 623
 624         return ctl;
 625 }
 626 EXPORT_SYMBOL(genphy_restart_aneg);
 627
 628
 629 /**
 630  * genphy_config_aneg - restart auto-negotiation or write BMCR
 631  * @phydev: target phy_device struct
 632  *
 633  * Description: If auto-negotiation is enabled, we configure the
 634  *   advertising, and then restart auto-negotiation.  If it is not
 635  *   enabled, then we write the BMCR.
 636  */
 637 int genphy_config_aneg(struct phy_device *phydev)
 638 {
 639         int result;
 640
 641         if (AUTONEG_ENABLE != phydev->autoneg)
 642                 return genphy_setup_forced(phydev);
 643
 644         result = genphy_config_advert(phydev);
 645
 646         if (result < 0) /* error */
 647                 return result;
 648
 649         if (result == 0) {
 650                 /* Advertisment hasn't changed, but maybe aneg was never on to
 651                  * begin with?  Or maybe phy was isolated? */
 652                 int ctl = phy_read(phydev, MII_BMCR);
 653
 654                 if (ctl < 0)
 655                         return ctl;
 656
 657                 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
 658                         result = 1; /* do restart aneg */
 659         }
 660
 661         /* Only restart aneg if we are advertising something different
 662          * than we were before.  */
 663         if (result > 0)
 664                 result = genphy_restart_aneg(phydev);
 665
 666         return result;
 667 }
 668 EXPORT_SYMBOL(genphy_config_aneg);
 669
 670 /**
 671  * genphy_update_link - update link status in @phydev
 672  * @phydev: target phy_device struct
 673  *
 674  * Description: Update the value in phydev->link to reflect the
 675  *   current link value.  In order to do this, we need to read
 676  *   the status register twice, keeping the second value.
 677  */
 678 int genphy_update_link(struct phy_device *phydev)
 679 {
 680         int status;
 681
 682         /* Do a fake read */
 683         status = phy_read(phydev, MII_BMSR);
 684
 685         if (status < 0)
 686                 return status;
 687
 688         /* Read link and autonegotiation status */
 689         status = phy_read(phydev, MII_BMSR);
 690
 691         if (status < 0)
 692                 return status;
 693
 694         if ((status & BMSR_LSTATUS) == 0)
 695                 phydev->link = 0;
 696         else
 697                 phydev->link = 1;
 698
 699         return 0;
 700 }
 701 EXPORT_SYMBOL(genphy_update_link);
 702
 703 /**
 704  * genphy_read_status - check the link status and update current link state
 705  * @phydev: target phy_device struct
 706  *
 707  * Description: Check the link, then figure out the current state
 708  *   by comparing what we advertise with what the link partner
 709  *   advertises.  Start by checking the gigabit possibilities,
 710  *   then move on to 10/100.
 711  */
 712 int genphy_read_status(struct phy_device *phydev)
 713 {
 714         int adv;
 715         int err;
 716         int lpa;
 717         int lpagb = 0;
 718
 719         /* Update the link, but return if there
 720          * was an error */
 721         err = genphy_update_link(phydev);
 722         if (err)
 723                 return err;
 724
 725         if (AUTONEG_ENABLE == phydev->autoneg) {
 726                 if (phydev->supported & (SUPPORTED_1000baseT_Half
 727                                         | SUPPORTED_1000baseT_Full)) {
 728                         lpagb = phy_read(phydev, MII_STAT1000);
 729
 730                         if (lpagb < 0)
 731                                 return lpagb;
 732
 733                         adv = phy_read(phydev, MII_CTRL1000);
 734
 735                         if (adv < 0)
 736                                 return adv;
 737
 738                         lpagb &= adv << 2;
 739                 }
 740
 741                 lpa = phy_read(phydev, MII_LPA);
 742
 743                 if (lpa < 0)
 744                         return lpa;
 745
 746                 adv = phy_read(phydev, MII_ADVERTISE);
 747
 748                 if (adv < 0)
 749                         return adv;
 750
 751                 lpa &= adv;
 752
 753                 phydev->speed = SPEED_10;
 754                 phydev->duplex = DUPLEX_HALF;
 755                 phydev->pause = phydev->asym_pause = 0;
 756
 757                 if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
 758                         phydev->speed = SPEED_1000;
 759
 760                         if (lpagb & LPA_1000FULL)
 761                                 phydev->duplex = DUPLEX_FULL;
 762                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 763                         phydev->speed = SPEED_100;
 764
 765                         if (lpa & LPA_100FULL)
 766                                 phydev->duplex = DUPLEX_FULL;
 767                 } else
 768                         if (lpa & LPA_10FULL)
 769                                 phydev->duplex = DUPLEX_FULL;
 770
 771                 if (phydev->duplex == DUPLEX_FULL){
 772                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 773                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 774                 }
 775         } else {
 776                 int bmcr = phy_read(phydev, MII_BMCR);
 777                 if (bmcr < 0)
 778                         return bmcr;
 779
 780                 if (bmcr & BMCR_FULLDPLX)
 781                         phydev->duplex = DUPLEX_FULL;
 782                 else
 783                         phydev->duplex = DUPLEX_HALF;
 784
 785                 if (bmcr & BMCR_SPEED1000)
 786                         phydev->speed = SPEED_1000;
 787                 else if (bmcr & BMCR_SPEED100)
 788                         phydev->speed = SPEED_100;
 789                 else
 790                         phydev->speed = SPEED_10;
 791
 792                 phydev->pause = phydev->asym_pause = 0;
 793         }
 794
 795         return 0;
 796 }
 797 EXPORT_SYMBOL(genphy_read_status);
 798
 799 static int genphy_config_init(struct phy_device *phydev)
 800 {
 801         int val;
 802         u32 features;
 803
 804         /* For now, I'll claim that the generic driver supports
 805          * all possible port types */
 806         features = (SUPPORTED_TP | SUPPORTED_MII
 807                         | SUPPORTED_AUI | SUPPORTED_FIBRE |
 808                         SUPPORTED_BNC);
 809
 810         /* Do we support autonegotiation? */
 811         val = phy_read(phydev, MII_BMSR);
 812
 813         if (val < 0)
 814                 return val;
 815
 816         if (val & BMSR_ANEGCAPABLE)
 817                 features |= SUPPORTED_Autoneg;
 818
 819         if (val & BMSR_100FULL)
 820                 features |= SUPPORTED_100baseT_Full;
 821         if (val & BMSR_100HALF)
 822                 features |= SUPPORTED_100baseT_Half;
 823         if (val & BMSR_10FULL)
 824                 features |= SUPPORTED_10baseT_Full;
 825         if (val & BMSR_10HALF)
 826                 features |= SUPPORTED_10baseT_Half;
 827
 828         if (val & BMSR_ESTATEN) {
 829                 val = phy_read(phydev, MII_ESTATUS);
 830
 831                 if (val < 0)
 832                         return val;
 833
 834                 if (val & ESTATUS_1000_TFULL)
 835                         features |= SUPPORTED_1000baseT_Full;
 836                 if (val & ESTATUS_1000_THALF)
 837                         features |= SUPPORTED_1000baseT_Half;
 838         }
 839
 840         phydev->supported = features;
 841         phydev->advertising = features;
 842
 843         return 0;
 844 }
 845 int genphy_suspend(struct phy_device *phydev)
 846 {
 847         int value;
 848
 849         mutex_lock(&phydev->lock);
 850
 851         value = phy_read(phydev, MII_BMCR);
 852         phy_write(phydev, MII_BMCR, (value | BMCR_PDOWN));
 853
 854         mutex_unlock(&phydev->lock);
 855
 856         return 0;
 857 }
 858 EXPORT_SYMBOL(genphy_suspend);
 859
 860 int genphy_resume(struct phy_device *phydev)
 861 {
 862         int value;
 863
 864         mutex_lock(&phydev->lock);
 865
 866         value = phy_read(phydev, MII_BMCR);
 867         phy_write(phydev, MII_BMCR, (value & ~BMCR_PDOWN));
 868
 869         mutex_unlock(&phydev->lock);
 870
 871         return 0;
 872 }
 873 EXPORT_SYMBOL(genphy_resume);
 874
 875 /**
 876  * phy_probe - probe and init a PHY device
 877  * @dev: device to probe and init
 878  *
 879  * Description: Take care of setting up the phy_device structure,
 880  *   set the state to READY (the driver's init function should
 881  *   set it to STARTING if needed).
 882  */
 883 static int phy_probe(struct device *dev)
 884 {
 885         struct phy_device *phydev;
 886         struct phy_driver *phydrv;
 887         struct device_driver *drv;
 888         int err = 0;
 889
 890         phydev = to_phy_device(dev);
 891
 892         /* Make sure the driver is held.
 893          * XXX -- Is this correct? */
 894         drv = get_driver(phydev->dev.driver);
 895         phydrv = to_phy_driver(drv);
 896         phydev->drv = phydrv;
 897
 898         /* Disable the interrupt if the PHY doesn't support it */
 899         if (!(phydrv->flags & PHY_HAS_INTERRUPT))
 900                 phydev->irq = PHY_POLL;
 901
 902         mutex_lock(&phydev->lock);
 903
 904         /* Start out supporting everything. Eventually,
 905          * a controller will attach, and may modify one
 906          * or both of these values */
 907         phydev->supported = phydrv->features;
 908         phydev->advertising = phydrv->features;
 909
 910         /* Set the state to READY by default */
 911         phydev->state = PHY_READY;
 912
 913         if (phydev->drv->probe)
 914                 err = phydev->drv->probe(phydev);
 915
 916         mutex_unlock(&phydev->lock);
 917
 918         return err;
 919
 920 }
 921
 922 static int phy_remove(struct device *dev)
 923 {
 924         struct phy_device *phydev;
 925
 926         phydev = to_phy_device(dev);
 927
 928         mutex_lock(&phydev->lock);
 929         phydev->state = PHY_DOWN;
 930         mutex_unlock(&phydev->lock);
 931
 932         if (phydev->drv->remove)
 933                 phydev->drv->remove(phydev);
 934
 935         put_driver(dev->driver);
 936         phydev->drv = NULL;
 937
 938         return 0;
 939 }
 940
 941 /**
 942  * phy_driver_register - register a phy_driver with the PHY layer
 943  * @new_driver: new phy_driver to register
 944  */
 945 int phy_driver_register(struct phy_driver *new_driver)
 946 {
 947         int retval;
 948
 949         new_driver->driver.name = new_driver->name;
 950         new_driver->driver.bus = &mdio_bus_type;
 951         new_driver->driver.probe = phy_probe;
 952         new_driver->driver.remove = phy_remove;
 953
 954         retval = driver_register(&new_driver->driver);
 955
 956         if (retval) {
 957                 printk(KERN_ERR "%s: Error %d in registering driver\n",
 958                                 new_driver->name, retval);
 959
 960                 return retval;
 961         }
 962
 963         pr_debug("%s: Registered new driver\n", new_driver->name);
 964
 965         return 0;
 966 }
 967 EXPORT_SYMBOL(phy_driver_register);
 968
 969 void phy_driver_unregister(struct phy_driver *drv)
 970 {
 971         driver_unregister(&drv->driver);
 972 }
 973 EXPORT_SYMBOL(phy_driver_unregister);
 974
 975 static struct phy_driver genphy_driver = {
 976         .phy_id         = 0xffffffff,
 977         .phy_id_mask    = 0xffffffff,
 978         .name           = "Generic PHY",
 979         .config_init    = genphy_config_init,
 980         .features       = 0,
 981         .config_aneg    = genphy_config_aneg,
 982         .read_status    = genphy_read_status,
 983         .suspend        = genphy_suspend,
 984         .resume         = genphy_resume,
 985         .driver         = {.owner= THIS_MODULE, },
 986 };
 987
 988 static int __init phy_init(void)
 989 {
 990         int rc;
 991
 992         rc = mdio_bus_init();
 993         if (rc)
 994                 return rc;
 995
 996         rc = phy_driver_register(&genphy_driver);
 997         if (rc)
 998                 mdio_bus_exit();
 999
1000         return rc;
1001 }
1002
1003 static void __exit phy_exit(void)
1004 {
1005         phy_driver_unregister(&genphy_driver);
1006         mdio_bus_exit();
1007 }
1008
1009 subsys_initcall(phy_init);
1010 module_exit(phy_exit);