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                                 mutex_unlock(&phy_fixup_lock);
 139                                 return err;
 140                         }
 141                 }
 142         }
 143         mutex_unlock(&phy_fixup_lock);
 144
 145         return 0;
 146 }
 147 EXPORT_SYMBOL(phy_scan_fixups);
 148
 149 struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
 150 {
 151         struct phy_device *dev;
 152         /* We allocate the device, and initialize the
 153          * default values */
 154         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 155
 156         if (NULL == dev)
 157                 return (struct phy_device*) PTR_ERR((void*)-ENOMEM);
 158
 159         dev->dev.release = phy_device_release;
 160
 161         dev->speed = 0;
 162         dev->duplex = -1;
 163         dev->pause = dev->asym_pause = 0;
 164         dev->link = 1;
 165         dev->interface = PHY_INTERFACE_MODE_GMII;
 166
 167         dev->autoneg = AUTONEG_ENABLE;
 168
 169         dev->addr = addr;
 170         dev->phy_id = phy_id;
 171         dev->bus = bus;
 172         dev->dev.parent = bus->parent;
 173         dev->dev.bus = &mdio_bus_type;
 174         dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
 175         dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
 176
 177         dev->state = PHY_DOWN;
 178
 179         mutex_init(&dev->lock);
 180         INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
 181
 182         return dev;
 183 }
 184 EXPORT_SYMBOL(phy_device_create);
 185
 186 /**
 187  * get_phy_id - reads the specified addr for its ID.
 188  * @bus: the target MII bus
 189  * @addr: PHY address on the MII bus
 190  * @phy_id: where to store the ID retrieved.
 191  *
 192  * Description: Reads the ID registers of the PHY at @addr on the
 193  *   @bus, stores it in @phy_id and returns zero on success.
 194  */
 195 int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
 196 {
 197         int phy_reg;
 198
 199         /* Grab the bits from PHYIR1, and put them
 200          * in the upper half */
 201         phy_reg = bus->read(bus, addr, MII_PHYSID1);
 202
 203         if (phy_reg < 0)
 204                 return -EIO;
 205
 206         *phy_id = (phy_reg & 0xffff) << 16;
 207
 208         /* Grab the bits from PHYIR2, and put them in the lower half */
 209         phy_reg = bus->read(bus, addr, MII_PHYSID2);
 210
 211         if (phy_reg < 0)
 212                 return -EIO;
 213
 214         *phy_id |= (phy_reg & 0xffff);
 215
 216         return 0;
 217 }
 218 EXPORT_SYMBOL(get_phy_id);
 219
 220 /**
 221  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
 222  * @bus: the target MII bus
 223  * @addr: PHY address on the MII bus
 224  *
 225  * Description: Reads the ID registers of the PHY at @addr on the
 226  *   @bus, then allocates and returns the phy_device to represent it.
 227  */
 228 struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
 229 {
 230         struct phy_device *dev = NULL;
 231         u32 phy_id;
 232         int r;
 233
 234         r = get_phy_id(bus, addr, &phy_id);
 235         if (r)
 236                 return ERR_PTR(r);
 237
 238         /* If the phy_id is mostly Fs, there is no device there */
 239         if ((phy_id & 0x1fffffff) == 0x1fffffff)
 240                 return NULL;
 241
 242         dev = phy_device_create(bus, addr, phy_id);
 243
 244         return dev;
 245 }
 246 EXPORT_SYMBOL(get_phy_device);
 247
 248 /**
 249  * phy_device_register - Register the phy device on the MDIO bus
 250  * @phydev: phy_device structure to be added to the MDIO bus
 251  */
 252 int phy_device_register(struct phy_device *phydev)
 253 {
 254         int err;
 255
 256         /* Don't register a phy if one is already registered at this
 257          * address */
 258         if (phydev->bus->phy_map[phydev->addr])
 259                 return -EINVAL;
 260         phydev->bus->phy_map[phydev->addr] = phydev;
 261
 262         /* Run all of the fixups for this PHY */
 263         phy_scan_fixups(phydev);
 264
 265         err = device_register(&phydev->dev);
 266         if (err) {
 267                 pr_err("phy %d failed to register\n", phydev->addr);
 268                 goto out;
 269         }
 270
 271         return 0;
 272
 273  out:
 274         phydev->bus->phy_map[phydev->addr] = NULL;
 275         return err;
 276 }
 277 EXPORT_SYMBOL(phy_device_register);
 278
 279 /**
 280  * phy_prepare_link - prepares the PHY layer to monitor link status
 281  * @phydev: target phy_device struct
 282  * @handler: callback function for link status change notifications
 283  *
 284  * Description: Tells the PHY infrastructure to handle the
 285  *   gory details on monitoring link status (whether through
 286  *   polling or an interrupt), and to call back to the
 287  *   connected device driver when the link status changes.
 288  *   If you want to monitor your own link state, don't call
 289  *   this function.
 290  */
 291 void phy_prepare_link(struct phy_device *phydev,
 292                 void (*handler)(struct net_device *))
 293 {
 294         phydev->adjust_link = handler;
 295 }
 296
 297 /**
 298  * phy_connect_direct - connect an ethernet device to a specific phy_device
 299  * @dev: the network device to connect
 300  * @phydev: the pointer to the phy device
 301  * @handler: callback function for state change notifications
 302  * @flags: PHY device's dev_flags
 303  * @interface: PHY device's interface
 304  */
 305 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 306                        void (*handler)(struct net_device *), u32 flags,
 307                        phy_interface_t interface)
 308 {
 309         int rc;
 310
 311         rc = phy_attach_direct(dev, phydev, flags, interface);
 312         if (rc)
 313                 return rc;
 314
 315         phy_prepare_link(phydev, handler);
 316         phy_start_machine(phydev, NULL);
 317         if (phydev->irq > 0)
 318                 phy_start_interrupts(phydev);
 319
 320         return 0;
 321 }
 322 EXPORT_SYMBOL(phy_connect_direct);
 323
 324 /**
 325  * phy_connect - connect an ethernet device to a PHY device
 326  * @dev: the network device to connect
 327  * @bus_id: the id string of the PHY device to connect
 328  * @handler: callback function for state change notifications
 329  * @flags: PHY device's dev_flags
 330  * @interface: PHY device's interface
 331  *
 332  * Description: Convenience function for connecting ethernet
 333  *   devices to PHY devices.  The default behavior is for
 334  *   the PHY infrastructure to handle everything, and only notify
 335  *   the connected driver when the link status changes.  If you
 336  *   don't want, or can't use the provided functionality, you may
 337  *   choose to call only the subset of functions which provide
 338  *   the desired functionality.
 339  */
 340 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 341                 void (*handler)(struct net_device *), u32 flags,
 342                 phy_interface_t interface)
 343 {
 344         struct phy_device *phydev;
 345         struct device *d;
 346         int rc;
 347
 348         /* Search the list of PHY devices on the mdio bus for the
 349          * PHY with the requested name */
 350         d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
 351         if (!d) {
 352                 pr_err("PHY %s not found\n", bus_id);
 353                 return ERR_PTR(-ENODEV);
 354         }
 355         phydev = to_phy_device(d);
 356
 357         rc = phy_connect_direct(dev, phydev, handler, flags, interface);
 358         if (rc)
 359                 return ERR_PTR(rc);
 360
 361         return phydev;
 362 }
 363 EXPORT_SYMBOL(phy_connect);
 364
 365 /**
 366  * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device
 367  * @phydev: target phy_device struct
 368  */
 369 void phy_disconnect(struct phy_device *phydev)
 370 {
 371         if (phydev->irq > 0)
 372                 phy_stop_interrupts(phydev);
 373
 374         phy_stop_machine(phydev);
 375
 376         phydev->adjust_link = NULL;
 377
 378         phy_detach(phydev);
 379 }
 380 EXPORT_SYMBOL(phy_disconnect);
 381
 382 int phy_init_hw(struct phy_device *phydev)
 383 {
 384         int ret;
 385
 386         if (!phydev->drv || !phydev->drv->config_init)
 387                 return 0;
 388
 389         ret = phy_scan_fixups(phydev);
 390         if (ret < 0)
 391                 return ret;
 392
 393         return phydev->drv->config_init(phydev);
 394 }
 395
 396 /**
 397  * phy_attach_direct - attach a network device to a given PHY device pointer
 398  * @dev: network device to attach
 399  * @phydev: Pointer to phy_device to attach
 400  * @flags: PHY device's dev_flags
 401  * @interface: PHY device's interface
 402  *
 403  * Description: Called by drivers to attach to a particular PHY
 404  *     device. The phy_device is found, and properly hooked up
 405  *     to the phy_driver.  If no driver is attached, then the
 406  *     genphy_driver is used.  The phy_device is given a ptr to
 407  *     the attaching device, and given a callback for link status
 408  *     change.  The phy_device is returned to the attaching driver.
 409  */
 410 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 411                       u32 flags, phy_interface_t interface)
 412 {
 413         struct device *d = &phydev->dev;
 414
 415         /* Assume that if there is no driver, that it doesn't
 416          * exist, and we should use the genphy driver. */
 417         if (NULL == d->driver) {
 418                 int err;
 419                 d->driver = &genphy_driver.driver;
 420
 421                 err = d->driver->probe(d);
 422                 if (err >= 0)
 423                         err = device_bind_driver(d);
 424
 425                 if (err)
 426                         return err;
 427         }
 428
 429         if (phydev->attached_dev) {
 430                 dev_err(&dev->dev, "PHY already attached\n");
 431                 return -EBUSY;
 432         }
 433
 434         phydev->attached_dev = dev;
 435
 436         phydev->dev_flags = flags;
 437
 438         phydev->interface = interface;
 439
 440         /* Do initial configuration here, now that
 441          * we have certain key parameters
 442          * (dev_flags and interface) */
 443         return phy_init_hw(phydev);
 444 }
 445 EXPORT_SYMBOL(phy_attach_direct);
 446
 447 /**
 448  * phy_attach - attach a network device to a particular PHY device
 449  * @dev: network device to attach
 450  * @bus_id: Bus ID of PHY device to attach
 451  * @flags: PHY device's dev_flags
 452  * @interface: PHY device's interface
 453  *
 454  * Description: Same as phy_attach_direct() except that a PHY bus_id
 455  *     string is passed instead of a pointer to a struct phy_device.
 456  */
 457 struct phy_device *phy_attach(struct net_device *dev,
 458                 const char *bus_id, u32 flags, phy_interface_t interface)
 459 {
 460         struct bus_type *bus = &mdio_bus_type;
 461         struct phy_device *phydev;
 462         struct device *d;
 463         int rc;
 464
 465         /* Search the list of PHY devices on the mdio bus for the
 466          * PHY with the requested name */
 467         d = bus_find_device_by_name(bus, NULL, bus_id);
 468         if (!d) {
 469                 pr_err("PHY %s not found\n", bus_id);
 470                 return ERR_PTR(-ENODEV);
 471         }
 472         phydev = to_phy_device(d);
 473
 474         rc = phy_attach_direct(dev, phydev, flags, interface);
 475         if (rc)
 476                 return ERR_PTR(rc);
 477
 478         return phydev;
 479 }
 480 EXPORT_SYMBOL(phy_attach);
 481
 482 /**
 483  * phy_detach - detach a PHY device from its network device
 484  * @phydev: target phy_device struct
 485  */
 486 void phy_detach(struct phy_device *phydev)
 487 {
 488         phydev->attached_dev = NULL;
 489
 490         /* If the device had no specific driver before (i.e. - it
 491          * was using the generic driver), we unbind the device
 492          * from the generic driver so that there's a chance a
 493          * real driver could be loaded */
 494         if (phydev->dev.driver == &genphy_driver.driver)
 495                 device_release_driver(&phydev->dev);
 496 }
 497 EXPORT_SYMBOL(phy_detach);
 498
 499
 500 /* Generic PHY support and helper functions */
 501
 502 /**
 503  * genphy_config_advert - sanitize and advertise auto-negotation parameters
 504  * @phydev: target phy_device struct
 505  *
 506  * Description: Writes MII_ADVERTISE with the appropriate values,
 507  *   after sanitizing the values to make sure we only advertise
 508  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
 509  *   hasn't changed, and > 0 if it has changed.
 510  */
 511 int genphy_config_advert(struct phy_device *phydev)
 512 {
 513         u32 advertise;
 514         int oldadv, adv;
 515         int err, changed = 0;
 516
 517         /* Only allow advertising what
 518          * this PHY supports */
 519         phydev->advertising &= phydev->supported;
 520         advertise = phydev->advertising;
 521
 522         /* Setup standard advertisement */
 523         oldadv = adv = phy_read(phydev, MII_ADVERTISE);
 524
 525         if (adv < 0)
 526                 return adv;
 527
 528         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
 529                  ADVERTISE_PAUSE_ASYM);
 530         if (advertise & ADVERTISED_10baseT_Half)
 531                 adv |= ADVERTISE_10HALF;
 532         if (advertise & ADVERTISED_10baseT_Full)
 533                 adv |= ADVERTISE_10FULL;
 534         if (advertise & ADVERTISED_100baseT_Half)
 535                 adv |= ADVERTISE_100HALF;
 536         if (advertise & ADVERTISED_100baseT_Full)
 537                 adv |= ADVERTISE_100FULL;
 538         if (advertise & ADVERTISED_Pause)
 539                 adv |= ADVERTISE_PAUSE_CAP;
 540         if (advertise & ADVERTISED_Asym_Pause)
 541                 adv |= ADVERTISE_PAUSE_ASYM;
 542
 543         if (adv != oldadv) {
 544                 err = phy_write(phydev, MII_ADVERTISE, adv);
 545
 546                 if (err < 0)
 547                         return err;
 548                 changed = 1;
 549         }
 550
 551         /* Configure gigabit if it's supported */
 552         if (phydev->supported & (SUPPORTED_1000baseT_Half |
 553                                 SUPPORTED_1000baseT_Full)) {
 554                 oldadv = adv = phy_read(phydev, MII_CTRL1000);
 555
 556                 if (adv < 0)
 557                         return adv;
 558
 559                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
 560                 if (advertise & SUPPORTED_1000baseT_Half)
 561                         adv |= ADVERTISE_1000HALF;
 562                 if (advertise & SUPPORTED_1000baseT_Full)
 563                         adv |= ADVERTISE_1000FULL;
 564
 565                 if (adv != oldadv) {
 566                         err = phy_write(phydev, MII_CTRL1000, adv);
 567
 568                         if (err < 0)
 569                                 return err;
 570                         changed = 1;
 571                 }
 572         }
 573
 574         return changed;
 575 }
 576 EXPORT_SYMBOL(genphy_config_advert);
 577
 578 /**
 579  * genphy_setup_forced - configures/forces speed/duplex from @phydev
 580  * @phydev: target phy_device struct
 581  *
 582  * Description: Configures MII_BMCR to force speed/duplex
 583  *   to the values in phydev. Assumes that the values are valid.
 584  *   Please see phy_sanitize_settings().
 585  */
 586 int genphy_setup_forced(struct phy_device *phydev)
 587 {
 588         int err;
 589         int ctl = 0;
 590
 591         phydev->pause = phydev->asym_pause = 0;
 592
 593         if (SPEED_1000 == phydev->speed)
 594                 ctl |= BMCR_SPEED1000;
 595         else if (SPEED_100 == phydev->speed)
 596                 ctl |= BMCR_SPEED100;
 597
 598         if (DUPLEX_FULL == phydev->duplex)
 599                 ctl |= BMCR_FULLDPLX;
 600
 601         err = phy_write(phydev, MII_BMCR, ctl);
 602
 603         return err;
 604 }
 605
 606
 607 /**
 608  * genphy_restart_aneg - Enable and Restart Autonegotiation
 609  * @phydev: target phy_device struct
 610  */
 611 int genphy_restart_aneg(struct phy_device *phydev)
 612 {
 613         int ctl;
 614
 615         ctl = phy_read(phydev, MII_BMCR);
 616
 617         if (ctl < 0)
 618                 return ctl;
 619
 620         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 621
 622         /* Don't isolate the PHY if we're negotiating */
 623         ctl &= ~(BMCR_ISOLATE);
 624
 625         ctl = phy_write(phydev, MII_BMCR, ctl);
 626
 627         return ctl;
 628 }
 629 EXPORT_SYMBOL(genphy_restart_aneg);
 630
 631
 632 /**
 633  * genphy_config_aneg - restart auto-negotiation or write BMCR
 634  * @phydev: target phy_device struct
 635  *
 636  * Description: If auto-negotiation is enabled, we configure the
 637  *   advertising, and then restart auto-negotiation.  If it is not
 638  *   enabled, then we write the BMCR.
 639  */
 640 int genphy_config_aneg(struct phy_device *phydev)
 641 {
 642         int result;
 643
 644         if (AUTONEG_ENABLE != phydev->autoneg)
 645                 return genphy_setup_forced(phydev);
 646
 647         result = genphy_config_advert(phydev);
 648
 649         if (result < 0) /* error */
 650                 return result;
 651
 652         if (result == 0) {
 653                 /* Advertisment hasn't changed, but maybe aneg was never on to
 654                  * begin with?  Or maybe phy was isolated? */
 655                 int ctl = phy_read(phydev, MII_BMCR);
 656
 657                 if (ctl < 0)
 658                         return ctl;
 659
 660                 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
 661                         result = 1; /* do restart aneg */
 662         }
 663
 664         /* Only restart aneg if we are advertising something different
 665          * than we were before.  */
 666         if (result > 0)
 667                 result = genphy_restart_aneg(phydev);
 668
 669         return result;
 670 }
 671 EXPORT_SYMBOL(genphy_config_aneg);
 672
 673 /**
 674  * genphy_update_link - update link status in @phydev
 675  * @phydev: target phy_device struct
 676  *
 677  * Description: Update the value in phydev->link to reflect the
 678  *   current link value.  In order to do this, we need to read
 679  *   the status register twice, keeping the second value.
 680  */
 681 int genphy_update_link(struct phy_device *phydev)
 682 {
 683         int status;
 684
 685         /* Do a fake read */
 686         status = phy_read(phydev, MII_BMSR);
 687
 688         if (status < 0)
 689                 return status;
 690
 691         /* Read link and autonegotiation status */
 692         status = phy_read(phydev, MII_BMSR);
 693
 694         if (status < 0)
 695                 return status;
 696
 697         if ((status & BMSR_LSTATUS) == 0)
 698                 phydev->link = 0;
 699         else
 700                 phydev->link = 1;
 701
 702         return 0;
 703 }
 704 EXPORT_SYMBOL(genphy_update_link);
 705
 706 /**
 707  * genphy_read_status - check the link status and update current link state
 708  * @phydev: target phy_device struct
 709  *
 710  * Description: Check the link, then figure out the current state
 711  *   by comparing what we advertise with what the link partner
 712  *   advertises.  Start by checking the gigabit possibilities,
 713  *   then move on to 10/100.
 714  */
 715 int genphy_read_status(struct phy_device *phydev)
 716 {
 717         int adv;
 718         int err;
 719         int lpa;
 720         int lpagb = 0;
 721
 722         /* Update the link, but return if there
 723          * was an error */
 724         err = genphy_update_link(phydev);
 725         if (err)
 726                 return err;
 727
 728         if (AUTONEG_ENABLE == phydev->autoneg) {
 729                 if (phydev->supported & (SUPPORTED_1000baseT_Half
 730                                         | SUPPORTED_1000baseT_Full)) {
 731                         lpagb = phy_read(phydev, MII_STAT1000);
 732
 733                         if (lpagb < 0)
 734                                 return lpagb;
 735
 736                         adv = phy_read(phydev, MII_CTRL1000);
 737
 738                         if (adv < 0)
 739                                 return adv;
 740
 741                         lpagb &= adv << 2;
 742                 }
 743
 744                 lpa = phy_read(phydev, MII_LPA);
 745
 746                 if (lpa < 0)
 747                         return lpa;
 748
 749                 adv = phy_read(phydev, MII_ADVERTISE);
 750
 751                 if (adv < 0)
 752                         return adv;
 753
 754                 lpa &= adv;
 755
 756                 phydev->speed = SPEED_10;
 757                 phydev->duplex = DUPLEX_HALF;
 758                 phydev->pause = phydev->asym_pause = 0;
 759
 760                 if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
 761                         phydev->speed = SPEED_1000;
 762
 763                         if (lpagb & LPA_1000FULL)
 764                                 phydev->duplex = DUPLEX_FULL;
 765                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 766                         phydev->speed = SPEED_100;
 767
 768                         if (lpa & LPA_100FULL)
 769                                 phydev->duplex = DUPLEX_FULL;
 770                 } else
 771                         if (lpa & LPA_10FULL)
 772                                 phydev->duplex = DUPLEX_FULL;
 773
 774                 if (phydev->duplex == DUPLEX_FULL){
 775                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 776                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 777                 }
 778         } else {
 779                 int bmcr = phy_read(phydev, MII_BMCR);
 780                 if (bmcr < 0)
 781                         return bmcr;
 782
 783                 if (bmcr & BMCR_FULLDPLX)
 784                         phydev->duplex = DUPLEX_FULL;
 785                 else
 786                         phydev->duplex = DUPLEX_HALF;
 787
 788                 if (bmcr & BMCR_SPEED1000)
 789                         phydev->speed = SPEED_1000;
 790                 else if (bmcr & BMCR_SPEED100)
 791                         phydev->speed = SPEED_100;
 792                 else
 793                         phydev->speed = SPEED_10;
 794
 795                 phydev->pause = phydev->asym_pause = 0;
 796         }
 797
 798         return 0;
 799 }
 800 EXPORT_SYMBOL(genphy_read_status);
 801
 802 static int genphy_config_init(struct phy_device *phydev)
 803 {
 804         int val;
 805         u32 features;
 806
 807         /* For now, I'll claim that the generic driver supports
 808          * all possible port types */
 809         features = (SUPPORTED_TP | SUPPORTED_MII
 810                         | SUPPORTED_AUI | SUPPORTED_FIBRE |
 811                         SUPPORTED_BNC);
 812
 813         /* Do we support autonegotiation? */
 814         val = phy_read(phydev, MII_BMSR);
 815
 816         if (val < 0)
 817                 return val;
 818
 819         if (val & BMSR_ANEGCAPABLE)
 820                 features |= SUPPORTED_Autoneg;
 821
 822         if (val & BMSR_100FULL)
 823                 features |= SUPPORTED_100baseT_Full;
 824         if (val & BMSR_100HALF)
 825                 features |= SUPPORTED_100baseT_Half;
 826         if (val & BMSR_10FULL)
 827                 features |= SUPPORTED_10baseT_Full;
 828         if (val & BMSR_10HALF)
 829                 features |= SUPPORTED_10baseT_Half;
 830
 831         if (val & BMSR_ESTATEN) {
 832                 val = phy_read(phydev, MII_ESTATUS);
 833
 834                 if (val < 0)
 835                         return val;
 836
 837                 if (val & ESTATUS_1000_TFULL)
 838                         features |= SUPPORTED_1000baseT_Full;
 839                 if (val & ESTATUS_1000_THALF)
 840                         features |= SUPPORTED_1000baseT_Half;
 841         }
 842
 843         phydev->supported = features;
 844         phydev->advertising = features;
 845
 846         return 0;
 847 }
 848 int genphy_suspend(struct phy_device *phydev)
 849 {
 850         int value;
 851
 852         mutex_lock(&phydev->lock);
 853
 854         value = phy_read(phydev, MII_BMCR);
 855         phy_write(phydev, MII_BMCR, (value | BMCR_PDOWN));
 856
 857         mutex_unlock(&phydev->lock);
 858
 859         return 0;
 860 }
 861 EXPORT_SYMBOL(genphy_suspend);
 862
 863 int genphy_resume(struct phy_device *phydev)
 864 {
 865         int value;
 866
 867         mutex_lock(&phydev->lock);
 868
 869         value = phy_read(phydev, MII_BMCR);
 870         phy_write(phydev, MII_BMCR, (value & ~BMCR_PDOWN));
 871
 872         mutex_unlock(&phydev->lock);
 873
 874         return 0;
 875 }
 876 EXPORT_SYMBOL(genphy_resume);
 877
 878 /**
 879  * phy_probe - probe and init a PHY device
 880  * @dev: device to probe and init
 881  *
 882  * Description: Take care of setting up the phy_device structure,
 883  *   set the state to READY (the driver's init function should
 884  *   set it to STARTING if needed).
 885  */
 886 static int phy_probe(struct device *dev)
 887 {
 888         struct phy_device *phydev;
 889         struct phy_driver *phydrv;
 890         struct device_driver *drv;
 891         int err = 0;
 892
 893         phydev = to_phy_device(dev);
 894
 895         /* Make sure the driver is held.
 896          * XXX -- Is this correct? */
 897         drv = get_driver(phydev->dev.driver);
 898         phydrv = to_phy_driver(drv);
 899         phydev->drv = phydrv;
 900
 901         /* Disable the interrupt if the PHY doesn't support it */
 902         if (!(phydrv->flags & PHY_HAS_INTERRUPT))
 903                 phydev->irq = PHY_POLL;
 904
 905         mutex_lock(&phydev->lock);
 906
 907         /* Start out supporting everything. Eventually,
 908          * a controller will attach, and may modify one
 909          * or both of these values */
 910         phydev->supported = phydrv->features;
 911         phydev->advertising = phydrv->features;
 912
 913         /* Set the state to READY by default */
 914         phydev->state = PHY_READY;
 915
 916         if (phydev->drv->probe)
 917                 err = phydev->drv->probe(phydev);
 918
 919         mutex_unlock(&phydev->lock);
 920
 921         return err;
 922
 923 }
 924
 925 static int phy_remove(struct device *dev)
 926 {
 927         struct phy_device *phydev;
 928
 929         phydev = to_phy_device(dev);
 930
 931         mutex_lock(&phydev->lock);
 932         phydev->state = PHY_DOWN;
 933         mutex_unlock(&phydev->lock);
 934
 935         if (phydev->drv->remove)
 936                 phydev->drv->remove(phydev);
 937
 938         put_driver(dev->driver);
 939         phydev->drv = NULL;
 940
 941         return 0;
 942 }
 943
 944 /**
 945  * phy_driver_register - register a phy_driver with the PHY layer
 946  * @new_driver: new phy_driver to register
 947  */
 948 int phy_driver_register(struct phy_driver *new_driver)
 949 {
 950         int retval;
 951
 952         new_driver->driver.name = new_driver->name;
 953         new_driver->driver.bus = &mdio_bus_type;
 954         new_driver->driver.probe = phy_probe;
 955         new_driver->driver.remove = phy_remove;
 956
 957         retval = driver_register(&new_driver->driver);
 958
 959         if (retval) {
 960                 printk(KERN_ERR "%s: Error %d in registering driver\n",
 961                                 new_driver->name, retval);
 962
 963                 return retval;
 964         }
 965
 966         pr_debug("%s: Registered new driver\n", new_driver->name);
 967
 968         return 0;
 969 }
 970 EXPORT_SYMBOL(phy_driver_register);
 971
 972 void phy_driver_unregister(struct phy_driver *drv)
 973 {
 974         driver_unregister(&drv->driver);
 975 }
 976 EXPORT_SYMBOL(phy_driver_unregister);
 977
 978 static struct phy_driver genphy_driver = {
 979         .phy_id         = 0xffffffff,
 980         .phy_id_mask    = 0xffffffff,
 981         .name           = "Generic PHY",
 982         .config_init    = genphy_config_init,
 983         .features       = 0,
 984         .config_aneg    = genphy_config_aneg,
 985         .read_status    = genphy_read_status,
 986         .suspend        = genphy_suspend,
 987         .resume         = genphy_resume,
 988         .driver         = {.owner= THIS_MODULE, },
 989 };
 990
 991 static int __init phy_init(void)
 992 {
 993         int rc;
 994
 995         rc = mdio_bus_init();
 996         if (rc)
 997                 return rc;
 998
 999         rc = phy_driver_register(&genphy_driver);
1000         if (rc)
1001                 mdio_bus_exit();
1002
1003         return rc;
1004 }
1005
1006 static void __exit phy_exit(void)
1007 {
1008         phy_driver_unregister(&genphy_driver);
1009         mdio_bus_exit();
1010 }
1011
1012 subsys_initcall(phy_init);
1013 module_exit(phy_exit);