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