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_find_first - finds the first PHY device on the bus
 281  * @bus: the target MII bus
 282  */
 283 struct phy_device *phy_find_first(struct mii_bus *bus)
 284 {
 285         int addr;
 286
 287         for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
 288                 if (bus->phy_map[addr])
 289                         return bus->phy_map[addr];
 290         }
 291         return NULL;
 292 }
 293 EXPORT_SYMBOL(phy_find_first);
 294
 295 /**
 296  * phy_prepare_link - prepares the PHY layer to monitor link status
 297  * @phydev: target phy_device struct
 298  * @handler: callback function for link status change notifications
 299  *
 300  * Description: Tells the PHY infrastructure to handle the
 301  *   gory details on monitoring link status (whether through
 302  *   polling or an interrupt), and to call back to the
 303  *   connected device driver when the link status changes.
 304  *   If you want to monitor your own link state, don't call
 305  *   this function.
 306  */
 307 void phy_prepare_link(struct phy_device *phydev,
 308                 void (*handler)(struct net_device *))
 309 {
 310         phydev->adjust_link = handler;
 311 }
 312
 313 /**
 314  * phy_connect_direct - connect an ethernet device to a specific phy_device
 315  * @dev: the network device to connect
 316  * @phydev: the pointer to the phy device
 317  * @handler: callback function for state change notifications
 318  * @flags: PHY device's dev_flags
 319  * @interface: PHY device's interface
 320  */
 321 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
 322                        void (*handler)(struct net_device *), u32 flags,
 323                        phy_interface_t interface)
 324 {
 325         int rc;
 326
 327         rc = phy_attach_direct(dev, phydev, flags, interface);
 328         if (rc)
 329                 return rc;
 330
 331         phy_prepare_link(phydev, handler);
 332         phy_start_machine(phydev, NULL);
 333         if (phydev->irq > 0)
 334                 phy_start_interrupts(phydev);
 335
 336         return 0;
 337 }
 338 EXPORT_SYMBOL(phy_connect_direct);
 339
 340 /**
 341  * phy_connect - connect an ethernet device to a PHY device
 342  * @dev: the network device to connect
 343  * @bus_id: the id string of the PHY device to connect
 344  * @handler: callback function for state change notifications
 345  * @flags: PHY device's dev_flags
 346  * @interface: PHY device's interface
 347  *
 348  * Description: Convenience function for connecting ethernet
 349  *   devices to PHY devices.  The default behavior is for
 350  *   the PHY infrastructure to handle everything, and only notify
 351  *   the connected driver when the link status changes.  If you
 352  *   don't want, or can't use the provided functionality, you may
 353  *   choose to call only the subset of functions which provide
 354  *   the desired functionality.
 355  */
 356 struct phy_device * phy_connect(struct net_device *dev, const char *bus_id,
 357                 void (*handler)(struct net_device *), u32 flags,
 358                 phy_interface_t interface)
 359 {
 360         struct phy_device *phydev;
 361         struct device *d;
 362         int rc;
 363
 364         /* Search the list of PHY devices on the mdio bus for the
 365          * PHY with the requested name */
 366         d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
 367         if (!d) {
 368                 pr_err("PHY %s not found\n", bus_id);
 369                 return ERR_PTR(-ENODEV);
 370         }
 371         phydev = to_phy_device(d);
 372
 373         rc = phy_connect_direct(dev, phydev, handler, flags, interface);
 374         if (rc)
 375                 return ERR_PTR(rc);
 376
 377         return phydev;
 378 }
 379 EXPORT_SYMBOL(phy_connect);
 380
 381 /**
 382  * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device
 383  * @phydev: target phy_device struct
 384  */
 385 void phy_disconnect(struct phy_device *phydev)
 386 {
 387         if (phydev->irq > 0)
 388                 phy_stop_interrupts(phydev);
 389
 390         phy_stop_machine(phydev);
 391
 392         phydev->adjust_link = NULL;
 393
 394         phy_detach(phydev);
 395 }
 396 EXPORT_SYMBOL(phy_disconnect);
 397
 398 int phy_init_hw(struct phy_device *phydev)
 399 {
 400         int ret;
 401
 402         if (!phydev->drv || !phydev->drv->config_init)
 403                 return 0;
 404
 405         ret = phy_scan_fixups(phydev);
 406         if (ret < 0)
 407                 return ret;
 408
 409         return phydev->drv->config_init(phydev);
 410 }
 411
 412 /**
 413  * phy_attach_direct - attach a network device to a given PHY device pointer
 414  * @dev: network device to attach
 415  * @phydev: Pointer to phy_device to attach
 416  * @flags: PHY device's dev_flags
 417  * @interface: PHY device's interface
 418  *
 419  * Description: Called by drivers to attach to a particular PHY
 420  *     device. The phy_device is found, and properly hooked up
 421  *     to the phy_driver.  If no driver is attached, then the
 422  *     genphy_driver is used.  The phy_device is given a ptr to
 423  *     the attaching device, and given a callback for link status
 424  *     change.  The phy_device is returned to the attaching driver.
 425  */
 426 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 427                       u32 flags, phy_interface_t interface)
 428 {
 429         struct device *d = &phydev->dev;
 430
 431         /* Assume that if there is no driver, that it doesn't
 432          * exist, and we should use the genphy driver. */
 433         if (NULL == d->driver) {
 434                 int err;
 435                 d->driver = &genphy_driver.driver;
 436
 437                 err = d->driver->probe(d);
 438                 if (err >= 0)
 439                         err = device_bind_driver(d);
 440
 441                 if (err)
 442                         return err;
 443         }
 444
 445         if (phydev->attached_dev) {
 446                 dev_err(&dev->dev, "PHY already attached\n");
 447                 return -EBUSY;
 448         }
 449
 450         phydev->attached_dev = dev;
 451
 452         phydev->dev_flags = flags;
 453
 454         phydev->interface = interface;
 455
 456         /* Do initial configuration here, now that
 457          * we have certain key parameters
 458          * (dev_flags and interface) */
 459         return phy_init_hw(phydev);
 460 }
 461 EXPORT_SYMBOL(phy_attach_direct);
 462
 463 /**
 464  * phy_attach - attach a network device to a particular PHY device
 465  * @dev: network device to attach
 466  * @bus_id: Bus ID of PHY device to attach
 467  * @flags: PHY device's dev_flags
 468  * @interface: PHY device's interface
 469  *
 470  * Description: Same as phy_attach_direct() except that a PHY bus_id
 471  *     string is passed instead of a pointer to a struct phy_device.
 472  */
 473 struct phy_device *phy_attach(struct net_device *dev,
 474                 const char *bus_id, u32 flags, phy_interface_t interface)
 475 {
 476         struct bus_type *bus = &mdio_bus_type;
 477         struct phy_device *phydev;
 478         struct device *d;
 479         int rc;
 480
 481         /* Search the list of PHY devices on the mdio bus for the
 482          * PHY with the requested name */
 483         d = bus_find_device_by_name(bus, NULL, bus_id);
 484         if (!d) {
 485                 pr_err("PHY %s not found\n", bus_id);
 486                 return ERR_PTR(-ENODEV);
 487         }
 488         phydev = to_phy_device(d);
 489
 490         rc = phy_attach_direct(dev, phydev, flags, interface);
 491         if (rc)
 492                 return ERR_PTR(rc);
 493
 494         return phydev;
 495 }
 496 EXPORT_SYMBOL(phy_attach);
 497
 498 /**
 499  * phy_detach - detach a PHY device from its network device
 500  * @phydev: target phy_device struct
 501  */
 502 void phy_detach(struct phy_device *phydev)
 503 {
 504         phydev->attached_dev = NULL;
 505
 506         /* If the device had no specific driver before (i.e. - it
 507          * was using the generic driver), we unbind the device
 508          * from the generic driver so that there's a chance a
 509          * real driver could be loaded */
 510         if (phydev->dev.driver == &genphy_driver.driver)
 511                 device_release_driver(&phydev->dev);
 512 }
 513 EXPORT_SYMBOL(phy_detach);
 514
 515
 516 /* Generic PHY support and helper functions */
 517
 518 /**
 519  * genphy_config_advert - sanitize and advertise auto-negotation parameters
 520  * @phydev: target phy_device struct
 521  *
 522  * Description: Writes MII_ADVERTISE with the appropriate values,
 523  *   after sanitizing the values to make sure we only advertise
 524  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
 525  *   hasn't changed, and > 0 if it has changed.
 526  */
 527 int genphy_config_advert(struct phy_device *phydev)
 528 {
 529         u32 advertise;
 530         int oldadv, adv;
 531         int err, changed = 0;
 532
 533         /* Only allow advertising what
 534          * this PHY supports */
 535         phydev->advertising &= phydev->supported;
 536         advertise = phydev->advertising;
 537
 538         /* Setup standard advertisement */
 539         oldadv = adv = phy_read(phydev, MII_ADVERTISE);
 540
 541         if (adv < 0)
 542                 return adv;
 543
 544         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
 545                  ADVERTISE_PAUSE_ASYM);
 546         if (advertise & ADVERTISED_10baseT_Half)
 547                 adv |= ADVERTISE_10HALF;
 548         if (advertise & ADVERTISED_10baseT_Full)
 549                 adv |= ADVERTISE_10FULL;
 550         if (advertise & ADVERTISED_100baseT_Half)
 551                 adv |= ADVERTISE_100HALF;
 552         if (advertise & ADVERTISED_100baseT_Full)
 553                 adv |= ADVERTISE_100FULL;
 554         if (advertise & ADVERTISED_Pause)
 555                 adv |= ADVERTISE_PAUSE_CAP;
 556         if (advertise & ADVERTISED_Asym_Pause)
 557                 adv |= ADVERTISE_PAUSE_ASYM;
 558
 559         if (adv != oldadv) {
 560                 err = phy_write(phydev, MII_ADVERTISE, adv);
 561
 562                 if (err < 0)
 563                         return err;
 564                 changed = 1;
 565         }
 566
 567         /* Configure gigabit if it's supported */
 568         if (phydev->supported & (SUPPORTED_1000baseT_Half |
 569                                 SUPPORTED_1000baseT_Full)) {
 570                 oldadv = adv = phy_read(phydev, MII_CTRL1000);
 571
 572                 if (adv < 0)
 573                         return adv;
 574
 575                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
 576                 if (advertise & SUPPORTED_1000baseT_Half)
 577                         adv |= ADVERTISE_1000HALF;
 578                 if (advertise & SUPPORTED_1000baseT_Full)
 579                         adv |= ADVERTISE_1000FULL;
 580
 581                 if (adv != oldadv) {
 582                         err = phy_write(phydev, MII_CTRL1000, adv);
 583
 584                         if (err < 0)
 585                                 return err;
 586                         changed = 1;
 587                 }
 588         }
 589
 590         return changed;
 591 }
 592 EXPORT_SYMBOL(genphy_config_advert);
 593
 594 /**
 595  * genphy_setup_forced - configures/forces speed/duplex from @phydev
 596  * @phydev: target phy_device struct
 597  *
 598  * Description: Configures MII_BMCR to force speed/duplex
 599  *   to the values in phydev. Assumes that the values are valid.
 600  *   Please see phy_sanitize_settings().
 601  */
 602 int genphy_setup_forced(struct phy_device *phydev)
 603 {
 604         int err;
 605         int ctl = 0;
 606
 607         phydev->pause = phydev->asym_pause = 0;
 608
 609         if (SPEED_1000 == phydev->speed)
 610                 ctl |= BMCR_SPEED1000;
 611         else if (SPEED_100 == phydev->speed)
 612                 ctl |= BMCR_SPEED100;
 613
 614         if (DUPLEX_FULL == phydev->duplex)
 615                 ctl |= BMCR_FULLDPLX;
 616
 617         err = phy_write(phydev, MII_BMCR, ctl);
 618
 619         return err;
 620 }
 621
 622
 623 /**
 624  * genphy_restart_aneg - Enable and Restart Autonegotiation
 625  * @phydev: target phy_device struct
 626  */
 627 int genphy_restart_aneg(struct phy_device *phydev)
 628 {
 629         int ctl;
 630
 631         ctl = phy_read(phydev, MII_BMCR);
 632
 633         if (ctl < 0)
 634                 return ctl;
 635
 636         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 637
 638         /* Don't isolate the PHY if we're negotiating */
 639         ctl &= ~(BMCR_ISOLATE);
 640
 641         ctl = phy_write(phydev, MII_BMCR, ctl);
 642
 643         return ctl;
 644 }
 645 EXPORT_SYMBOL(genphy_restart_aneg);
 646
 647
 648 /**
 649  * genphy_config_aneg - restart auto-negotiation or write BMCR
 650  * @phydev: target phy_device struct
 651  *
 652  * Description: If auto-negotiation is enabled, we configure the
 653  *   advertising, and then restart auto-negotiation.  If it is not
 654  *   enabled, then we write the BMCR.
 655  */
 656 int genphy_config_aneg(struct phy_device *phydev)
 657 {
 658         int result;
 659
 660         if (AUTONEG_ENABLE != phydev->autoneg)
 661                 return genphy_setup_forced(phydev);
 662
 663         result = genphy_config_advert(phydev);
 664
 665         if (result < 0) /* error */
 666                 return result;
 667
 668         if (result == 0) {
 669                 /* Advertisment hasn't changed, but maybe aneg was never on to
 670                  * begin with?  Or maybe phy was isolated? */
 671                 int ctl = phy_read(phydev, MII_BMCR);
 672
 673                 if (ctl < 0)
 674                         return ctl;
 675
 676                 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
 677                         result = 1; /* do restart aneg */
 678         }
 679
 680         /* Only restart aneg if we are advertising something different
 681          * than we were before.  */
 682         if (result > 0)
 683                 result = genphy_restart_aneg(phydev);
 684
 685         return result;
 686 }
 687 EXPORT_SYMBOL(genphy_config_aneg);
 688
 689 /**
 690  * genphy_update_link - update link status in @phydev
 691  * @phydev: target phy_device struct
 692  *
 693  * Description: Update the value in phydev->link to reflect the
 694  *   current link value.  In order to do this, we need to read
 695  *   the status register twice, keeping the second value.
 696  */
 697 int genphy_update_link(struct phy_device *phydev)
 698 {
 699         int status;
 700
 701         /* Do a fake read */
 702         status = phy_read(phydev, MII_BMSR);
 703
 704         if (status < 0)
 705                 return status;
 706
 707         /* Read link and autonegotiation status */
 708         status = phy_read(phydev, MII_BMSR);
 709
 710         if (status < 0)
 711                 return status;
 712
 713         if ((status & BMSR_LSTATUS) == 0)
 714                 phydev->link = 0;
 715         else
 716                 phydev->link = 1;
 717
 718         return 0;
 719 }
 720 EXPORT_SYMBOL(genphy_update_link);
 721
 722 /**
 723  * genphy_read_status - check the link status and update current link state
 724  * @phydev: target phy_device struct
 725  *
 726  * Description: Check the link, then figure out the current state
 727  *   by comparing what we advertise with what the link partner
 728  *   advertises.  Start by checking the gigabit possibilities,
 729  *   then move on to 10/100.
 730  */
 731 int genphy_read_status(struct phy_device *phydev)
 732 {
 733         int adv;
 734         int err;
 735         int lpa;
 736         int lpagb = 0;
 737
 738         /* Update the link, but return if there
 739          * was an error */
 740         err = genphy_update_link(phydev);
 741         if (err)
 742                 return err;
 743
 744         if (AUTONEG_ENABLE == phydev->autoneg) {
 745                 if (phydev->supported & (SUPPORTED_1000baseT_Half
 746                                         | SUPPORTED_1000baseT_Full)) {
 747                         lpagb = phy_read(phydev, MII_STAT1000);
 748
 749                         if (lpagb < 0)
 750                                 return lpagb;
 751
 752                         adv = phy_read(phydev, MII_CTRL1000);
 753
 754                         if (adv < 0)
 755                                 return adv;
 756
 757                         lpagb &= adv << 2;
 758                 }
 759
 760                 lpa = phy_read(phydev, MII_LPA);
 761
 762                 if (lpa < 0)
 763                         return lpa;
 764
 765                 adv = phy_read(phydev, MII_ADVERTISE);
 766
 767                 if (adv < 0)
 768                         return adv;
 769
 770                 lpa &= adv;
 771
 772                 phydev->speed = SPEED_10;
 773                 phydev->duplex = DUPLEX_HALF;
 774                 phydev->pause = phydev->asym_pause = 0;
 775
 776                 if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
 777                         phydev->speed = SPEED_1000;
 778
 779                         if (lpagb & LPA_1000FULL)
 780                                 phydev->duplex = DUPLEX_FULL;
 781                 } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 782                         phydev->speed = SPEED_100;
 783
 784                         if (lpa & LPA_100FULL)
 785                                 phydev->duplex = DUPLEX_FULL;
 786                 } else
 787                         if (lpa & LPA_10FULL)
 788                                 phydev->duplex = DUPLEX_FULL;
 789
 790                 if (phydev->duplex == DUPLEX_FULL){
 791                         phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 792                         phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 793                 }
 794         } else {
 795                 int bmcr = phy_read(phydev, MII_BMCR);
 796                 if (bmcr < 0)
 797                         return bmcr;
 798
 799                 if (bmcr & BMCR_FULLDPLX)
 800                         phydev->duplex = DUPLEX_FULL;
 801                 else
 802                         phydev->duplex = DUPLEX_HALF;
 803
 804                 if (bmcr & BMCR_SPEED1000)
 805                         phydev->speed = SPEED_1000;
 806                 else if (bmcr & BMCR_SPEED100)
 807                         phydev->speed = SPEED_100;
 808                 else
 809                         phydev->speed = SPEED_10;
 810
 811                 phydev->pause = phydev->asym_pause = 0;
 812         }
 813
 814         return 0;
 815 }
 816 EXPORT_SYMBOL(genphy_read_status);
 817
 818 static int genphy_config_init(struct phy_device *phydev)
 819 {
 820         int val;
 821         u32 features;
 822
 823         /* For now, I'll claim that the generic driver supports
 824          * all possible port types */
 825         features = (SUPPORTED_TP | SUPPORTED_MII
 826                         | SUPPORTED_AUI | SUPPORTED_FIBRE |
 827                         SUPPORTED_BNC);
 828
 829         /* Do we support autonegotiation? */
 830         val = phy_read(phydev, MII_BMSR);
 831
 832         if (val < 0)
 833                 return val;
 834
 835         if (val & BMSR_ANEGCAPABLE)
 836                 features |= SUPPORTED_Autoneg;
 837
 838         if (val & BMSR_100FULL)
 839                 features |= SUPPORTED_100baseT_Full;
 840         if (val & BMSR_100HALF)
 841                 features |= SUPPORTED_100baseT_Half;
 842         if (val & BMSR_10FULL)
 843                 features |= SUPPORTED_10baseT_Full;
 844         if (val & BMSR_10HALF)
 845                 features |= SUPPORTED_10baseT_Half;
 846
 847         if (val & BMSR_ESTATEN) {
 848                 val = phy_read(phydev, MII_ESTATUS);
 849
 850                 if (val < 0)
 851                         return val;
 852
 853                 if (val & ESTATUS_1000_TFULL)
 854                         features |= SUPPORTED_1000baseT_Full;
 855                 if (val & ESTATUS_1000_THALF)
 856                         features |= SUPPORTED_1000baseT_Half;
 857         }
 858
 859         phydev->supported = features;
 860         phydev->advertising = features;
 861
 862         return 0;
 863 }
 864 int genphy_suspend(struct phy_device *phydev)
 865 {
 866         int value;
 867
 868         mutex_lock(&phydev->lock);
 869
 870         value = phy_read(phydev, MII_BMCR);
 871         phy_write(phydev, MII_BMCR, (value | BMCR_PDOWN));
 872
 873         mutex_unlock(&phydev->lock);
 874
 875         return 0;
 876 }
 877 EXPORT_SYMBOL(genphy_suspend);
 878
 879 int genphy_resume(struct phy_device *phydev)
 880 {
 881         int value;
 882
 883         mutex_lock(&phydev->lock);
 884
 885         value = phy_read(phydev, MII_BMCR);
 886         phy_write(phydev, MII_BMCR, (value & ~BMCR_PDOWN));
 887
 888         mutex_unlock(&phydev->lock);
 889
 890         return 0;
 891 }
 892 EXPORT_SYMBOL(genphy_resume);
 893
 894 /**
 895  * phy_probe - probe and init a PHY device
 896  * @dev: device to probe and init
 897  *
 898  * Description: Take care of setting up the phy_device structure,
 899  *   set the state to READY (the driver's init function should
 900  *   set it to STARTING if needed).
 901  */
 902 static int phy_probe(struct device *dev)
 903 {
 904         struct phy_device *phydev;
 905         struct phy_driver *phydrv;
 906         struct device_driver *drv;
 907         int err = 0;
 908
 909         phydev = to_phy_device(dev);
 910
 911         /* Make sure the driver is held.
 912          * XXX -- Is this correct? */
 913         drv = get_driver(phydev->dev.driver);
 914         phydrv = to_phy_driver(drv);
 915         phydev->drv = phydrv;
 916
 917         /* Disable the interrupt if the PHY doesn't support it */
 918         if (!(phydrv->flags & PHY_HAS_INTERRUPT))
 919                 phydev->irq = PHY_POLL;
 920
 921         mutex_lock(&phydev->lock);
 922
 923         /* Start out supporting everything. Eventually,
 924          * a controller will attach, and may modify one
 925          * or both of these values */
 926         phydev->supported = phydrv->features;
 927         phydev->advertising = phydrv->features;
 928
 929         /* Set the state to READY by default */
 930         phydev->state = PHY_READY;
 931
 932         if (phydev->drv->probe)
 933                 err = phydev->drv->probe(phydev);
 934
 935         mutex_unlock(&phydev->lock);
 936
 937         return err;
 938
 939 }
 940
 941 static int phy_remove(struct device *dev)
 942 {
 943         struct phy_device *phydev;
 944
 945         phydev = to_phy_device(dev);
 946
 947         mutex_lock(&phydev->lock);
 948         phydev->state = PHY_DOWN;
 949         mutex_unlock(&phydev->lock);
 950
 951         if (phydev->drv->remove)
 952                 phydev->drv->remove(phydev);
 953
 954         put_driver(dev->driver);
 955         phydev->drv = NULL;
 956
 957         return 0;
 958 }
 959
 960 /**
 961  * phy_driver_register - register a phy_driver with the PHY layer
 962  * @new_driver: new phy_driver to register
 963  */
 964 int phy_driver_register(struct phy_driver *new_driver)
 965 {
 966         int retval;
 967
 968         new_driver->driver.name = new_driver->name;
 969         new_driver->driver.bus = &mdio_bus_type;
 970         new_driver->driver.probe = phy_probe;
 971         new_driver->driver.remove = phy_remove;
 972
 973         retval = driver_register(&new_driver->driver);
 974
 975         if (retval) {
 976                 printk(KERN_ERR "%s: Error %d in registering driver\n",
 977                                 new_driver->name, retval);
 978
 979                 return retval;
 980         }
 981
 982         pr_debug("%s: Registered new driver\n", new_driver->name);
 983
 984         return 0;
 985 }
 986 EXPORT_SYMBOL(phy_driver_register);
 987
 988 void phy_driver_unregister(struct phy_driver *drv)
 989 {
 990         driver_unregister(&drv->driver);
 991 }
 992 EXPORT_SYMBOL(phy_driver_unregister);
 993
 994 static struct phy_driver genphy_driver = {
 995         .phy_id         = 0xffffffff,
 996         .phy_id_mask    = 0xffffffff,
 997         .name           = "Generic PHY",
 998         .config_init    = genphy_config_init,
 999         .features       = 0,
1000         .config_aneg    = genphy_config_aneg,
1001         .read_status    = genphy_read_status,
1002         .suspend        = genphy_suspend,
1003         .resume         = genphy_resume,
1004         .driver         = {.owner= THIS_MODULE, },
1005 };
1006
1007 static int __init phy_init(void)
1008 {
1009         int rc;
1010
1011         rc = mdio_bus_init();
1012         if (rc)
1013                 return rc;
1014
1015         rc = phy_driver_register(&genphy_driver);
1016         if (rc)
1017                 mdio_bus_exit();
1018
1019         return rc;
1020 }
1021
1022 static void __exit phy_exit(void)
1023 {
1024         phy_driver_unregister(&genphy_driver);
1025         mdio_bus_exit();
1026 }
1027
1028 subsys_initcall(phy_init);
1029 module_exit(phy_exit);