1/* Framework for finding and configuring PHYs. 2 * Also contains generic PHY driver 3 * 4 * Author: Andy Fleming 5 * 6 * Copyright (c) 2004 Freescale Semiconductor, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 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#include <linux/mdio.h> 34#include <linux/io.h> 35#include <linux/uaccess.h> 36#include <linux/of.h> 37 38#include <asm/irq.h> 39 40MODULE_DESCRIPTION("PHY library"); 41MODULE_AUTHOR("Andy Fleming"); 42MODULE_LICENSE("GPL"); 43 44void phy_device_free(struct phy_device *phydev) 45{ 46 put_device(&phydev->dev); 47} 48EXPORT_SYMBOL(phy_device_free); 49 50static void phy_device_release(struct device *dev) 51{ 52 kfree(to_phy_device(dev)); 53} 54 55enum genphy_driver { 56 GENPHY_DRV_1G, 57 GENPHY_DRV_10G, 58 GENPHY_DRV_MAX 59}; 60 61static struct phy_driver genphy_driver[GENPHY_DRV_MAX]; 62 63static LIST_HEAD(phy_fixup_list); 64static DEFINE_MUTEX(phy_fixup_lock); 65 66/** 67 * phy_register_fixup - creates a new phy_fixup and adds it to the list 68 * @bus_id: A string which matches phydev->dev.bus_id (or PHY_ANY_ID) 69 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) 70 * It can also be PHY_ANY_UID 71 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before 72 * comparison 73 * @run: The actual code to be run when a matching PHY is found 74 */ 75int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, 76 int (*run)(struct phy_device *)) 77{ 78 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); 79 80 if (!fixup) 81 return -ENOMEM; 82 83 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); 84 fixup->phy_uid = phy_uid; 85 fixup->phy_uid_mask = phy_uid_mask; 86 fixup->run = run; 87 88 mutex_lock(&phy_fixup_lock); 89 list_add_tail(&fixup->list, &phy_fixup_list); 90 mutex_unlock(&phy_fixup_lock); 91 92 return 0; 93} 94EXPORT_SYMBOL(phy_register_fixup); 95 96/* Registers a fixup to be run on any PHY with the UID in phy_uid */ 97int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, 98 int (*run)(struct phy_device *)) 99{ 100 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); 101} 102EXPORT_SYMBOL(phy_register_fixup_for_uid); 103 104/* Registers a fixup to be run on the PHY with id string bus_id */ 105int phy_register_fixup_for_id(const char *bus_id, 106 int (*run)(struct phy_device *)) 107{ 108 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); 109} 110EXPORT_SYMBOL(phy_register_fixup_for_id); 111 112/* Returns 1 if fixup matches phydev in bus_id and phy_uid. 113 * Fixups can be set to match any in one or more fields. 114 */ 115static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) 116{ 117 if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0) 118 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) 119 return 0; 120 121 if ((fixup->phy_uid & fixup->phy_uid_mask) != 122 (phydev->phy_id & fixup->phy_uid_mask)) 123 if (fixup->phy_uid != PHY_ANY_UID) 124 return 0; 125 126 return 1; 127} 128 129/* Runs any matching fixups for this phydev */ 130static int phy_scan_fixups(struct phy_device *phydev) 131{ 132 struct phy_fixup *fixup; 133 134 mutex_lock(&phy_fixup_lock); 135 list_for_each_entry(fixup, &phy_fixup_list, list) { 136 if (phy_needs_fixup(phydev, fixup)) { 137 int err = fixup->run(phydev); 138 139 if (err < 0) { 140 mutex_unlock(&phy_fixup_lock); 141 return err; 142 } 143 phydev->has_fixups = true; 144 } 145 } 146 mutex_unlock(&phy_fixup_lock); 147 148 return 0; 149} 150 151struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id, 152 bool is_c45, 153 struct phy_c45_device_ids *c45_ids) 154{ 155 struct phy_device *dev; 156 157 /* We allocate the device, and initialize the default values */ 158 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 159 if (!dev) 160 return ERR_PTR(-ENOMEM); 161 162 dev->dev.release = phy_device_release; 163 164 dev->speed = 0; 165 dev->duplex = -1; 166 dev->pause = 0; 167 dev->asym_pause = 0; 168 dev->link = 1; 169 dev->interface = PHY_INTERFACE_MODE_GMII; 170 171 dev->autoneg = AUTONEG_ENABLE; 172 173 dev->is_c45 = is_c45; 174 dev->addr = addr; 175 dev->phy_id = phy_id; 176 if (c45_ids) 177 dev->c45_ids = *c45_ids; 178 dev->bus = bus; 179 dev->dev.parent = &bus->dev; 180 dev->dev.bus = &mdio_bus_type; 181 dev->irq = bus->irq ? bus->irq[addr] : PHY_POLL; 182 dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr); 183 184 dev->state = PHY_DOWN; 185 186 mutex_init(&dev->lock); 187 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); 188 INIT_WORK(&dev->phy_queue, phy_change); 189 190 /* Request the appropriate module unconditionally; don't 191 * bother trying to do so only if it isn't already loaded, 192 * because that gets complicated. A hotplug event would have 193 * done an unconditional modprobe anyway. 194 * We don't do normal hotplug because it won't work for MDIO 195 * -- because it relies on the device staying around for long 196 * enough for the driver to get loaded. With MDIO, the NIC 197 * driver will get bored and give up as soon as it finds that 198 * there's no driver _already_ loaded. 199 */ 200 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id)); 201 202 device_initialize(&dev->dev); 203 204 return dev; 205} 206EXPORT_SYMBOL(phy_device_create); 207 208/* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers. 209 * @bus: the target MII bus 210 * @addr: PHY address on the MII bus 211 * @dev_addr: MMD address in the PHY. 212 * @devices_in_package: where to store the devices in package information. 213 * 214 * Description: reads devices in package registers of a MMD at @dev_addr 215 * from PHY at @addr on @bus. 216 * 217 * Returns: 0 on success, -EIO on failure. 218 */ 219static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr, 220 u32 *devices_in_package) 221{ 222 int phy_reg, reg_addr; 223 224 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2; 225 phy_reg = mdiobus_read(bus, addr, reg_addr); 226 if (phy_reg < 0) 227 return -EIO; 228 *devices_in_package = (phy_reg & 0xffff) << 16; 229 230 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1; 231 phy_reg = mdiobus_read(bus, addr, reg_addr); 232 if (phy_reg < 0) 233 return -EIO; 234 *devices_in_package |= (phy_reg & 0xffff); 235 236 return 0; 237} 238 239/** 240 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs. 241 * @bus: the target MII bus 242 * @addr: PHY address on the MII bus 243 * @phy_id: where to store the ID retrieved. 244 * @c45_ids: where to store the c45 ID information. 245 * 246 * If the PHY devices-in-package appears to be valid, it and the 247 * corresponding identifiers are stored in @c45_ids, zero is stored 248 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns 249 * zero on success. 250 * 251 */ 252static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id, 253 struct phy_c45_device_ids *c45_ids) { 254 int phy_reg; 255 int i, reg_addr; 256 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 257 u32 *devs = &c45_ids->devices_in_package; 258 259 /* Find first non-zero Devices In package. Device zero is reserved 260 * for 802.3 c45 complied PHYs, so don't probe it at first. 261 */ 262 for (i = 1; i < num_ids && *devs == 0; i++) { 263 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs); 264 if (phy_reg < 0) 265 return -EIO; 266 267 if ((*devs & 0x1fffffff) == 0x1fffffff) { 268 /* If mostly Fs, there is no device there, 269 * then let's continue to probe more, as some 270 * 10G PHYs have zero Devices In package, 271 * e.g. Cortina CS4315/CS4340 PHY. 272 */ 273 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs); 274 if (phy_reg < 0) 275 return -EIO; 276 /* no device there, let's get out of here */ 277 if ((*devs & 0x1fffffff) == 0x1fffffff) { 278 *phy_id = 0xffffffff; 279 return 0; 280 } else { 281 break; 282 } 283 } 284 } 285 286 /* Now probe Device Identifiers for each device present. */ 287 for (i = 1; i < num_ids; i++) { 288 if (!(c45_ids->devices_in_package & (1 << i))) 289 continue; 290 291 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1; 292 phy_reg = mdiobus_read(bus, addr, reg_addr); 293 if (phy_reg < 0) 294 return -EIO; 295 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16; 296 297 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2; 298 phy_reg = mdiobus_read(bus, addr, reg_addr); 299 if (phy_reg < 0) 300 return -EIO; 301 c45_ids->device_ids[i] |= (phy_reg & 0xffff); 302 } 303 *phy_id = 0; 304 return 0; 305} 306 307/** 308 * get_phy_id - reads the specified addr for its ID. 309 * @bus: the target MII bus 310 * @addr: PHY address on the MII bus 311 * @phy_id: where to store the ID retrieved. 312 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 313 * @c45_ids: where to store the c45 ID information. 314 * 315 * Description: In the case of a 802.3-c22 PHY, reads the ID registers 316 * of the PHY at @addr on the @bus, stores it in @phy_id and returns 317 * zero on success. 318 * 319 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and 320 * its return value is in turn returned. 321 * 322 */ 323static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id, 324 bool is_c45, struct phy_c45_device_ids *c45_ids) 325{ 326 int phy_reg; 327 328 if (is_c45) 329 return get_phy_c45_ids(bus, addr, phy_id, c45_ids); 330 331 /* Grab the bits from PHYIR1, and put them in the upper half */ 332 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1); 333 if (phy_reg < 0) 334 return -EIO; 335 336 *phy_id = (phy_reg & 0xffff) << 16; 337 338 /* Grab the bits from PHYIR2, and put them in the lower half */ 339 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2); 340 if (phy_reg < 0) 341 return -EIO; 342 343 *phy_id |= (phy_reg & 0xffff); 344 345 return 0; 346} 347 348/** 349 * get_phy_device - reads the specified PHY device and returns its @phy_device 350 * struct 351 * @bus: the target MII bus 352 * @addr: PHY address on the MII bus 353 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 354 * 355 * Description: Reads the ID registers of the PHY at @addr on the 356 * @bus, then allocates and returns the phy_device to represent it. 357 */ 358struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45) 359{ 360 struct phy_c45_device_ids c45_ids = {0}; 361 u32 phy_id = 0; 362 int r; 363 364 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids); 365 if (r) 366 return ERR_PTR(r); 367 368 /* If the phy_id is mostly Fs, there is no device there */ 369 if ((phy_id & 0x1fffffff) == 0x1fffffff) 370 return NULL; 371 372 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids); 373} 374EXPORT_SYMBOL(get_phy_device); 375 376/** 377 * phy_device_register - Register the phy device on the MDIO bus 378 * @phydev: phy_device structure to be added to the MDIO bus 379 */ 380int phy_device_register(struct phy_device *phydev) 381{ 382 int err; 383 384 /* Don't register a phy if one is already registered at this address */ 385 if (phydev->bus->phy_map[phydev->addr]) 386 return -EINVAL; 387 phydev->bus->phy_map[phydev->addr] = phydev; 388 389 /* Run all of the fixups for this PHY */ 390 err = phy_scan_fixups(phydev); 391 if (err) { 392 pr_err("PHY %d failed to initialize\n", phydev->addr); 393 goto out; 394 } 395 396 err = device_add(&phydev->dev); 397 if (err) { 398 pr_err("PHY %d failed to add\n", phydev->addr); 399 goto out; 400 } 401 402 return 0; 403 404 out: 405 phydev->bus->phy_map[phydev->addr] = NULL; 406 return err; 407} 408EXPORT_SYMBOL(phy_device_register); 409 410/** 411 * phy_device_remove - Remove a previously registered phy device from the MDIO bus 412 * @phydev: phy_device structure to remove 413 * 414 * This doesn't free the phy_device itself, it merely reverses the effects 415 * of phy_device_register(). Use phy_device_free() to free the device 416 * after calling this function. 417 */ 418void phy_device_remove(struct phy_device *phydev) 419{ 420 struct mii_bus *bus = phydev->bus; 421 int addr = phydev->addr; 422 423 device_del(&phydev->dev); 424 bus->phy_map[addr] = NULL; 425} 426EXPORT_SYMBOL(phy_device_remove); 427 428/** 429 * phy_find_first - finds the first PHY device on the bus 430 * @bus: the target MII bus 431 */ 432struct phy_device *phy_find_first(struct mii_bus *bus) 433{ 434 int addr; 435 436 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 437 if (bus->phy_map[addr]) 438 return bus->phy_map[addr]; 439 } 440 return NULL; 441} 442EXPORT_SYMBOL(phy_find_first); 443 444/** 445 * phy_prepare_link - prepares the PHY layer to monitor link status 446 * @phydev: target phy_device struct 447 * @handler: callback function for link status change notifications 448 * 449 * Description: Tells the PHY infrastructure to handle the 450 * gory details on monitoring link status (whether through 451 * polling or an interrupt), and to call back to the 452 * connected device driver when the link status changes. 453 * If you want to monitor your own link state, don't call 454 * this function. 455 */ 456static void phy_prepare_link(struct phy_device *phydev, 457 void (*handler)(struct net_device *)) 458{ 459 phydev->adjust_link = handler; 460} 461 462/** 463 * phy_connect_direct - connect an ethernet device to a specific phy_device 464 * @dev: the network device to connect 465 * @phydev: the pointer to the phy device 466 * @handler: callback function for state change notifications 467 * @interface: PHY device's interface 468 */ 469int phy_connect_direct(struct net_device *dev, struct phy_device *phydev, 470 void (*handler)(struct net_device *), 471 phy_interface_t interface) 472{ 473 int rc; 474 475 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 476 if (rc) 477 return rc; 478 479 phy_prepare_link(phydev, handler); 480 phy_start_machine(phydev); 481 if (phydev->irq > 0) 482 phy_start_interrupts(phydev); 483 484 return 0; 485} 486EXPORT_SYMBOL(phy_connect_direct); 487 488/** 489 * phy_connect - connect an ethernet device to a PHY device 490 * @dev: the network device to connect 491 * @bus_id: the id string of the PHY device to connect 492 * @handler: callback function for state change notifications 493 * @interface: PHY device's interface 494 * 495 * Description: Convenience function for connecting ethernet 496 * devices to PHY devices. The default behavior is for 497 * the PHY infrastructure to handle everything, and only notify 498 * the connected driver when the link status changes. If you 499 * don't want, or can't use the provided functionality, you may 500 * choose to call only the subset of functions which provide 501 * the desired functionality. 502 */ 503struct phy_device *phy_connect(struct net_device *dev, const char *bus_id, 504 void (*handler)(struct net_device *), 505 phy_interface_t interface) 506{ 507 struct phy_device *phydev; 508 struct device *d; 509 int rc; 510 511 /* Search the list of PHY devices on the mdio bus for the 512 * PHY with the requested name 513 */ 514 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id); 515 if (!d) { 516 pr_err("PHY %s not found\n", bus_id); 517 return ERR_PTR(-ENODEV); 518 } 519 phydev = to_phy_device(d); 520 521 rc = phy_connect_direct(dev, phydev, handler, interface); 522 if (rc) 523 return ERR_PTR(rc); 524 525 return phydev; 526} 527EXPORT_SYMBOL(phy_connect); 528 529/** 530 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY 531 * device 532 * @phydev: target phy_device struct 533 */ 534void phy_disconnect(struct phy_device *phydev) 535{ 536 if (phydev->irq > 0) 537 phy_stop_interrupts(phydev); 538 539 phy_stop_machine(phydev); 540 541 phydev->adjust_link = NULL; 542 543 phy_detach(phydev); 544} 545EXPORT_SYMBOL(phy_disconnect); 546 547/** 548 * phy_poll_reset - Safely wait until a PHY reset has properly completed 549 * @phydev: The PHY device to poll 550 * 551 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as 552 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR 553 * register must be polled until the BMCR_RESET bit clears. 554 * 555 * Furthermore, any attempts to write to PHY registers may have no effect 556 * or even generate MDIO bus errors until this is complete. 557 * 558 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the 559 * standard and do not fully reset after the BMCR_RESET bit is set, and may 560 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an 561 * effort to support such broken PHYs, this function is separate from the 562 * standard phy_init_hw() which will zero all the other bits in the BMCR 563 * and reapply all driver-specific and board-specific fixups. 564 */ 565static int phy_poll_reset(struct phy_device *phydev) 566{ 567 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ 568 unsigned int retries = 12; 569 int ret; 570 571 do { 572 msleep(50); 573 ret = phy_read(phydev, MII_BMCR); 574 if (ret < 0) 575 return ret; 576 } while (ret & BMCR_RESET && --retries); 577 if (ret & BMCR_RESET) 578 return -ETIMEDOUT; 579 580 /* Some chips (smsc911x) may still need up to another 1ms after the 581 * BMCR_RESET bit is cleared before they are usable. 582 */ 583 msleep(1); 584 return 0; 585} 586 587int phy_init_hw(struct phy_device *phydev) 588{ 589 int ret = 0; 590 591 if (!phydev->drv || !phydev->drv->config_init) 592 return 0; 593 594 if (phydev->drv->soft_reset) 595 ret = phydev->drv->soft_reset(phydev); 596 else 597 ret = genphy_soft_reset(phydev); 598 599 if (ret < 0) 600 return ret; 601 602 ret = phy_scan_fixups(phydev); 603 if (ret < 0) 604 return ret; 605 606 return phydev->drv->config_init(phydev); 607} 608EXPORT_SYMBOL(phy_init_hw); 609 610/** 611 * phy_attach_direct - attach a network device to a given PHY device pointer 612 * @dev: network device to attach 613 * @phydev: Pointer to phy_device to attach 614 * @flags: PHY device's dev_flags 615 * @interface: PHY device's interface 616 * 617 * Description: Called by drivers to attach to a particular PHY 618 * device. The phy_device is found, and properly hooked up 619 * to the phy_driver. If no driver is attached, then a 620 * generic driver is used. The phy_device is given a ptr to 621 * the attaching device, and given a callback for link status 622 * change. The phy_device is returned to the attaching driver. 623 * This function takes a reference on the phy device. 624 */ 625int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 626 u32 flags, phy_interface_t interface) 627{ 628 struct mii_bus *bus = phydev->bus; 629 struct device *d = &phydev->dev; 630 int err; 631 632 if (!try_module_get(bus->owner)) { 633 dev_err(&dev->dev, "failed to get the bus module\n"); 634 return -EIO; 635 } 636 637 get_device(d); 638 639 /* Assume that if there is no driver, that it doesn't 640 * exist, and we should use the genphy driver. 641 */ 642 if (!d->driver) { 643 if (phydev->is_c45) 644 d->driver = &genphy_driver[GENPHY_DRV_10G].driver; 645 else 646 d->driver = &genphy_driver[GENPHY_DRV_1G].driver; 647 648 err = d->driver->probe(d); 649 if (err >= 0) 650 err = device_bind_driver(d); 651 652 if (err) 653 goto error; 654 } 655 656 if (phydev->attached_dev) { 657 dev_err(&dev->dev, "PHY already attached\n"); 658 err = -EBUSY; 659 goto error; 660 } 661 662 phydev->attached_dev = dev; 663 dev->phydev = phydev; 664 665 phydev->dev_flags = flags; 666 667 phydev->interface = interface; 668 669 phydev->state = PHY_READY; 670 671 /* Do initial configuration here, now that 672 * we have certain key parameters 673 * (dev_flags and interface) 674 */ 675 err = phy_init_hw(phydev); 676 if (err) 677 phy_detach(phydev); 678 else 679 phy_resume(phydev); 680 681 return err; 682 683error: 684 put_device(d); 685 module_put(bus->owner); 686 return err; 687} 688EXPORT_SYMBOL(phy_attach_direct); 689 690/** 691 * phy_attach - attach a network device to a particular PHY device 692 * @dev: network device to attach 693 * @bus_id: Bus ID of PHY device to attach 694 * @interface: PHY device's interface 695 * 696 * Description: Same as phy_attach_direct() except that a PHY bus_id 697 * string is passed instead of a pointer to a struct phy_device. 698 */ 699struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 700 phy_interface_t interface) 701{ 702 struct bus_type *bus = &mdio_bus_type; 703 struct phy_device *phydev; 704 struct device *d; 705 int rc; 706 707 /* Search the list of PHY devices on the mdio bus for the 708 * PHY with the requested name 709 */ 710 d = bus_find_device_by_name(bus, NULL, bus_id); 711 if (!d) { 712 pr_err("PHY %s not found\n", bus_id); 713 return ERR_PTR(-ENODEV); 714 } 715 phydev = to_phy_device(d); 716 717 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 718 if (rc) 719 return ERR_PTR(rc); 720 721 return phydev; 722} 723EXPORT_SYMBOL(phy_attach); 724 725/** 726 * phy_detach - detach a PHY device from its network device 727 * @phydev: target phy_device struct 728 * 729 * This detaches the phy device from its network device and the phy 730 * driver, and drops the reference count taken in phy_attach_direct(). 731 */ 732void phy_detach(struct phy_device *phydev) 733{ 734 struct mii_bus *bus; 735 int i; 736 737 phydev->attached_dev->phydev = NULL; 738 phydev->attached_dev = NULL; 739 phy_suspend(phydev); 740 741 /* If the device had no specific driver before (i.e. - it 742 * was using the generic driver), we unbind the device 743 * from the generic driver so that there's a chance a 744 * real driver could be loaded 745 */ 746 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) { 747 if (phydev->dev.driver == &genphy_driver[i].driver) { 748 device_release_driver(&phydev->dev); 749 break; 750 } 751 } 752 753 /* 754 * The phydev might go away on the put_device() below, so avoid 755 * a use-after-free bug by reading the underlying bus first. 756 */ 757 bus = phydev->bus; 758 759 put_device(&phydev->dev); 760 module_put(bus->owner); 761} 762EXPORT_SYMBOL(phy_detach); 763 764int phy_suspend(struct phy_device *phydev) 765{ 766 struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver); 767 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 768 int ret = 0; 769 770 /* If the device has WOL enabled, we cannot suspend the PHY */ 771 phy_ethtool_get_wol(phydev, &wol); 772 if (wol.wolopts) 773 return -EBUSY; 774 775 if (phydrv->suspend) 776 ret = phydrv->suspend(phydev); 777 778 if (ret) 779 return ret; 780 781 phydev->suspended = true; 782 783 return ret; 784} 785EXPORT_SYMBOL(phy_suspend); 786 787int phy_resume(struct phy_device *phydev) 788{ 789 struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver); 790 int ret = 0; 791 792 if (phydrv->resume) 793 ret = phydrv->resume(phydev); 794 795 if (ret) 796 return ret; 797 798 phydev->suspended = false; 799 800 return ret; 801} 802EXPORT_SYMBOL(phy_resume); 803 804/* Generic PHY support and helper functions */ 805 806/** 807 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 808 * @phydev: target phy_device struct 809 * 810 * Description: Writes MII_ADVERTISE with the appropriate values, 811 * after sanitizing the values to make sure we only advertise 812 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 813 * hasn't changed, and > 0 if it has changed. 814 */ 815static int genphy_config_advert(struct phy_device *phydev) 816{ 817 u32 advertise; 818 int oldadv, adv, bmsr; 819 int err, changed = 0; 820 821 /* Only allow advertising what this PHY supports */ 822 phydev->advertising &= phydev->supported; 823 advertise = phydev->advertising; 824 825 /* Setup standard advertisement */ 826 adv = phy_read(phydev, MII_ADVERTISE); 827 if (adv < 0) 828 return adv; 829 830 oldadv = adv; 831 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | 832 ADVERTISE_PAUSE_ASYM); 833 adv |= ethtool_adv_to_mii_adv_t(advertise); 834 835 if (adv != oldadv) { 836 err = phy_write(phydev, MII_ADVERTISE, adv); 837 838 if (err < 0) 839 return err; 840 changed = 1; 841 } 842 843 bmsr = phy_read(phydev, MII_BMSR); 844 if (bmsr < 0) 845 return bmsr; 846 847 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 848 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 849 * logical 1. 850 */ 851 if (!(bmsr & BMSR_ESTATEN)) 852 return changed; 853 854 /* Configure gigabit if it's supported */ 855 adv = phy_read(phydev, MII_CTRL1000); 856 if (adv < 0) 857 return adv; 858 859 oldadv = adv; 860 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); 861 862 if (phydev->supported & (SUPPORTED_1000baseT_Half | 863 SUPPORTED_1000baseT_Full)) { 864 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise); 865 } 866 867 if (adv != oldadv) 868 changed = 1; 869 870 err = phy_write(phydev, MII_CTRL1000, adv); 871 if (err < 0) 872 return err; 873 874 return changed; 875} 876 877/** 878 * genphy_setup_forced - configures/forces speed/duplex from @phydev 879 * @phydev: target phy_device struct 880 * 881 * Description: Configures MII_BMCR to force speed/duplex 882 * to the values in phydev. Assumes that the values are valid. 883 * Please see phy_sanitize_settings(). 884 */ 885int genphy_setup_forced(struct phy_device *phydev) 886{ 887 int ctl = 0; 888 889 phydev->pause = 0; 890 phydev->asym_pause = 0; 891 892 if (SPEED_1000 == phydev->speed) 893 ctl |= BMCR_SPEED1000; 894 else if (SPEED_100 == phydev->speed) 895 ctl |= BMCR_SPEED100; 896 897 if (DUPLEX_FULL == phydev->duplex) 898 ctl |= BMCR_FULLDPLX; 899 900 return phy_write(phydev, MII_BMCR, ctl); 901} 902EXPORT_SYMBOL(genphy_setup_forced); 903 904/** 905 * genphy_restart_aneg - Enable and Restart Autonegotiation 906 * @phydev: target phy_device struct 907 */ 908int genphy_restart_aneg(struct phy_device *phydev) 909{ 910 int ctl = phy_read(phydev, MII_BMCR); 911 912 if (ctl < 0) 913 return ctl; 914 915 ctl |= BMCR_ANENABLE | BMCR_ANRESTART; 916 917 /* Don't isolate the PHY if we're negotiating */ 918 ctl &= ~BMCR_ISOLATE; 919 920 return phy_write(phydev, MII_BMCR, ctl); 921} 922EXPORT_SYMBOL(genphy_restart_aneg); 923 924/** 925 * genphy_config_aneg - restart auto-negotiation or write BMCR 926 * @phydev: target phy_device struct 927 * 928 * Description: If auto-negotiation is enabled, we configure the 929 * advertising, and then restart auto-negotiation. If it is not 930 * enabled, then we write the BMCR. 931 */ 932int genphy_config_aneg(struct phy_device *phydev) 933{ 934 int result; 935 936 if (AUTONEG_ENABLE != phydev->autoneg) 937 return genphy_setup_forced(phydev); 938 939 result = genphy_config_advert(phydev); 940 if (result < 0) /* error */ 941 return result; 942 if (result == 0) { 943 /* Advertisement hasn't changed, but maybe aneg was never on to 944 * begin with? Or maybe phy was isolated? 945 */ 946 int ctl = phy_read(phydev, MII_BMCR); 947 948 if (ctl < 0) 949 return ctl; 950 951 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 952 result = 1; /* do restart aneg */ 953 } 954 955 /* Only restart aneg if we are advertising something different 956 * than we were before. 957 */ 958 if (result > 0) 959 result = genphy_restart_aneg(phydev); 960 961 return result; 962} 963EXPORT_SYMBOL(genphy_config_aneg); 964 965/** 966 * genphy_aneg_done - return auto-negotiation status 967 * @phydev: target phy_device struct 968 * 969 * Description: Reads the status register and returns 0 either if 970 * auto-negotiation is incomplete, or if there was an error. 971 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 972 */ 973int genphy_aneg_done(struct phy_device *phydev) 974{ 975 int retval = phy_read(phydev, MII_BMSR); 976 977 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 978} 979EXPORT_SYMBOL(genphy_aneg_done); 980 981static int gen10g_config_aneg(struct phy_device *phydev) 982{ 983 return 0; 984} 985 986/** 987 * genphy_update_link - update link status in @phydev 988 * @phydev: target phy_device struct 989 * 990 * Description: Update the value in phydev->link to reflect the 991 * current link value. In order to do this, we need to read 992 * the status register twice, keeping the second value. 993 */ 994int genphy_update_link(struct phy_device *phydev) 995{ 996 int status; 997 998 /* Do a fake read */ 999 status = phy_read(phydev, MII_BMSR); 1000 if (status < 0) 1001 return status; 1002 1003 /* Read link and autonegotiation status */ 1004 status = phy_read(phydev, MII_BMSR); 1005 if (status < 0) 1006 return status; 1007 1008 if ((status & BMSR_LSTATUS) == 0) 1009 phydev->link = 0; 1010 else 1011 phydev->link = 1; 1012 1013 return 0; 1014} 1015EXPORT_SYMBOL(genphy_update_link); 1016 1017/** 1018 * genphy_read_status - check the link status and update current link state 1019 * @phydev: target phy_device struct 1020 * 1021 * Description: Check the link, then figure out the current state 1022 * by comparing what we advertise with what the link partner 1023 * advertises. Start by checking the gigabit possibilities, 1024 * then move on to 10/100. 1025 */ 1026int genphy_read_status(struct phy_device *phydev) 1027{ 1028 int adv; 1029 int err; 1030 int lpa; 1031 int lpagb = 0; 1032 int common_adv; 1033 int common_adv_gb = 0; 1034 1035 /* Update the link, but return if there was an error */ 1036 err = genphy_update_link(phydev); 1037 if (err) 1038 return err; 1039 1040 phydev->lp_advertising = 0; 1041 1042 if (AUTONEG_ENABLE == phydev->autoneg) { 1043 if (phydev->supported & (SUPPORTED_1000baseT_Half 1044 | SUPPORTED_1000baseT_Full)) { 1045 lpagb = phy_read(phydev, MII_STAT1000); 1046 if (lpagb < 0) 1047 return lpagb; 1048 1049 adv = phy_read(phydev, MII_CTRL1000); 1050 if (adv < 0) 1051 return adv; 1052 1053 phydev->lp_advertising = 1054 mii_stat1000_to_ethtool_lpa_t(lpagb); 1055 common_adv_gb = lpagb & adv << 2; 1056 } 1057 1058 lpa = phy_read(phydev, MII_LPA); 1059 if (lpa < 0) 1060 return lpa; 1061 1062 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa); 1063 1064 adv = phy_read(phydev, MII_ADVERTISE); 1065 if (adv < 0) 1066 return adv; 1067 1068 common_adv = lpa & adv; 1069 1070 phydev->speed = SPEED_10; 1071 phydev->duplex = DUPLEX_HALF; 1072 phydev->pause = 0; 1073 phydev->asym_pause = 0; 1074 1075 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) { 1076 phydev->speed = SPEED_1000; 1077 1078 if (common_adv_gb & LPA_1000FULL) 1079 phydev->duplex = DUPLEX_FULL; 1080 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) { 1081 phydev->speed = SPEED_100; 1082 1083 if (common_adv & LPA_100FULL) 1084 phydev->duplex = DUPLEX_FULL; 1085 } else 1086 if (common_adv & LPA_10FULL) 1087 phydev->duplex = DUPLEX_FULL; 1088 1089 if (phydev->duplex == DUPLEX_FULL) { 1090 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0; 1091 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0; 1092 } 1093 } else { 1094 int bmcr = phy_read(phydev, MII_BMCR); 1095 1096 if (bmcr < 0) 1097 return bmcr; 1098 1099 if (bmcr & BMCR_FULLDPLX) 1100 phydev->duplex = DUPLEX_FULL; 1101 else 1102 phydev->duplex = DUPLEX_HALF; 1103 1104 if (bmcr & BMCR_SPEED1000) 1105 phydev->speed = SPEED_1000; 1106 else if (bmcr & BMCR_SPEED100) 1107 phydev->speed = SPEED_100; 1108 else 1109 phydev->speed = SPEED_10; 1110 1111 phydev->pause = 0; 1112 phydev->asym_pause = 0; 1113 } 1114 1115 return 0; 1116} 1117EXPORT_SYMBOL(genphy_read_status); 1118 1119static int gen10g_read_status(struct phy_device *phydev) 1120{ 1121 int devad, reg; 1122 u32 mmd_mask = phydev->c45_ids.devices_in_package; 1123 1124 phydev->link = 1; 1125 1126 /* For now just lie and say it's 10G all the time */ 1127 phydev->speed = SPEED_10000; 1128 phydev->duplex = DUPLEX_FULL; 1129 1130 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) { 1131 if (!(mmd_mask & 1)) 1132 continue; 1133 1134 /* Read twice because link state is latched and a 1135 * read moves the current state into the register 1136 */ 1137 phy_read_mmd(phydev, devad, MDIO_STAT1); 1138 reg = phy_read_mmd(phydev, devad, MDIO_STAT1); 1139 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS)) 1140 phydev->link = 0; 1141 } 1142 1143 return 0; 1144} 1145 1146/** 1147 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 1148 * @phydev: target phy_device struct 1149 * 1150 * Description: Perform a software PHY reset using the standard 1151 * BMCR_RESET bit and poll for the reset bit to be cleared. 1152 * 1153 * Returns: 0 on success, < 0 on failure 1154 */ 1155int genphy_soft_reset(struct phy_device *phydev) 1156{ 1157 int ret; 1158 1159 ret = phy_write(phydev, MII_BMCR, BMCR_RESET); 1160 if (ret < 0) 1161 return ret; 1162 1163 return phy_poll_reset(phydev); 1164} 1165EXPORT_SYMBOL(genphy_soft_reset); 1166 1167int genphy_config_init(struct phy_device *phydev) 1168{ 1169 int val; 1170 u32 features; 1171 1172 features = (SUPPORTED_TP | SUPPORTED_MII 1173 | SUPPORTED_AUI | SUPPORTED_FIBRE | 1174 SUPPORTED_BNC); 1175 1176 /* Do we support autonegotiation? */ 1177 val = phy_read(phydev, MII_BMSR); 1178 if (val < 0) 1179 return val; 1180 1181 if (val & BMSR_ANEGCAPABLE) 1182 features |= SUPPORTED_Autoneg; 1183 1184 if (val & BMSR_100FULL) 1185 features |= SUPPORTED_100baseT_Full; 1186 if (val & BMSR_100HALF) 1187 features |= SUPPORTED_100baseT_Half; 1188 if (val & BMSR_10FULL) 1189 features |= SUPPORTED_10baseT_Full; 1190 if (val & BMSR_10HALF) 1191 features |= SUPPORTED_10baseT_Half; 1192 1193 if (val & BMSR_ESTATEN) { 1194 val = phy_read(phydev, MII_ESTATUS); 1195 if (val < 0) 1196 return val; 1197 1198 if (val & ESTATUS_1000_TFULL) 1199 features |= SUPPORTED_1000baseT_Full; 1200 if (val & ESTATUS_1000_THALF) 1201 features |= SUPPORTED_1000baseT_Half; 1202 } 1203 1204 phydev->supported &= features; 1205 phydev->advertising &= features; 1206 1207 return 0; 1208} 1209 1210static int gen10g_soft_reset(struct phy_device *phydev) 1211{ 1212 /* Do nothing for now */ 1213 return 0; 1214} 1215EXPORT_SYMBOL(genphy_config_init); 1216 1217static int gen10g_config_init(struct phy_device *phydev) 1218{ 1219 /* Temporarily just say we support everything */ 1220 phydev->supported = SUPPORTED_10000baseT_Full; 1221 phydev->advertising = SUPPORTED_10000baseT_Full; 1222 1223 return 0; 1224} 1225 1226int genphy_suspend(struct phy_device *phydev) 1227{ 1228 int value; 1229 1230 mutex_lock(&phydev->lock); 1231 1232 value = phy_read(phydev, MII_BMCR); 1233 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN); 1234 1235 mutex_unlock(&phydev->lock); 1236 1237 return 0; 1238} 1239EXPORT_SYMBOL(genphy_suspend); 1240 1241static int gen10g_suspend(struct phy_device *phydev) 1242{ 1243 return 0; 1244} 1245 1246int genphy_resume(struct phy_device *phydev) 1247{ 1248 int value; 1249 1250 mutex_lock(&phydev->lock); 1251 1252 value = phy_read(phydev, MII_BMCR); 1253 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN); 1254 1255 mutex_unlock(&phydev->lock); 1256 1257 return 0; 1258} 1259EXPORT_SYMBOL(genphy_resume); 1260 1261static int gen10g_resume(struct phy_device *phydev) 1262{ 1263 return 0; 1264} 1265 1266static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) 1267{ 1268 /* The default values for phydev->supported are provided by the PHY 1269 * driver "features" member, we want to reset to sane defaults first 1270 * before supporting higher speeds. 1271 */ 1272 phydev->supported &= PHY_DEFAULT_FEATURES; 1273 1274 switch (max_speed) { 1275 default: 1276 return -ENOTSUPP; 1277 case SPEED_1000: 1278 phydev->supported |= PHY_1000BT_FEATURES; 1279 /* fall through */ 1280 case SPEED_100: 1281 phydev->supported |= PHY_100BT_FEATURES; 1282 /* fall through */ 1283 case SPEED_10: 1284 phydev->supported |= PHY_10BT_FEATURES; 1285 } 1286 1287 return 0; 1288} 1289 1290int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) 1291{ 1292 int err; 1293 1294 err = __set_phy_supported(phydev, max_speed); 1295 if (err) 1296 return err; 1297 1298 phydev->advertising = phydev->supported; 1299 1300 return 0; 1301} 1302EXPORT_SYMBOL(phy_set_max_speed); 1303 1304static void of_set_phy_supported(struct phy_device *phydev) 1305{ 1306 struct device_node *node = phydev->dev.of_node; 1307 u32 max_speed; 1308 1309 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1310 return; 1311 1312 if (!node) 1313 return; 1314 1315 if (!of_property_read_u32(node, "max-speed", &max_speed)) 1316 __set_phy_supported(phydev, max_speed); 1317} 1318 1319/** 1320 * phy_probe - probe and init a PHY device 1321 * @dev: device to probe and init 1322 * 1323 * Description: Take care of setting up the phy_device structure, 1324 * set the state to READY (the driver's init function should 1325 * set it to STARTING if needed). 1326 */ 1327static int phy_probe(struct device *dev) 1328{ 1329 struct phy_device *phydev = to_phy_device(dev); 1330 struct device_driver *drv = phydev->dev.driver; 1331 struct phy_driver *phydrv = to_phy_driver(drv); 1332 int err = 0; 1333 1334 phydev->drv = phydrv; 1335 1336 /* Disable the interrupt if the PHY doesn't support it 1337 * but the interrupt is still a valid one 1338 */ 1339 if (!(phydrv->flags & PHY_HAS_INTERRUPT) && 1340 phy_interrupt_is_valid(phydev)) 1341 phydev->irq = PHY_POLL; 1342 1343 if (phydrv->flags & PHY_IS_INTERNAL) 1344 phydev->is_internal = true; 1345 1346 mutex_lock(&phydev->lock); 1347 1348 /* Start out supporting everything. Eventually, 1349 * a controller will attach, and may modify one 1350 * or both of these values 1351 */ 1352 phydev->supported = phydrv->features; 1353 of_set_phy_supported(phydev); 1354 phydev->advertising = phydev->supported; 1355 1356 /* Set the state to READY by default */ 1357 phydev->state = PHY_READY; 1358 1359 if (phydev->drv->probe) 1360 err = phydev->drv->probe(phydev); 1361 1362 mutex_unlock(&phydev->lock); 1363 1364 return err; 1365} 1366 1367static int phy_remove(struct device *dev) 1368{ 1369 struct phy_device *phydev = to_phy_device(dev); 1370 1371 mutex_lock(&phydev->lock); 1372 phydev->state = PHY_DOWN; 1373 mutex_unlock(&phydev->lock); 1374 1375 if (phydev->drv->remove) 1376 phydev->drv->remove(phydev); 1377 phydev->drv = NULL; 1378 1379 return 0; 1380} 1381 1382/** 1383 * phy_driver_register - register a phy_driver with the PHY layer 1384 * @new_driver: new phy_driver to register 1385 */ 1386int phy_driver_register(struct phy_driver *new_driver) 1387{ 1388 int retval; 1389 1390 new_driver->driver.name = new_driver->name; 1391 new_driver->driver.bus = &mdio_bus_type; 1392 new_driver->driver.probe = phy_probe; 1393 new_driver->driver.remove = phy_remove; 1394 1395 retval = driver_register(&new_driver->driver); 1396 if (retval) { 1397 pr_err("%s: Error %d in registering driver\n", 1398 new_driver->name, retval); 1399 1400 return retval; 1401 } 1402 1403 pr_debug("%s: Registered new driver\n", new_driver->name); 1404 1405 return 0; 1406} 1407EXPORT_SYMBOL(phy_driver_register); 1408 1409int phy_drivers_register(struct phy_driver *new_driver, int n) 1410{ 1411 int i, ret = 0; 1412 1413 for (i = 0; i < n; i++) { 1414 ret = phy_driver_register(new_driver + i); 1415 if (ret) { 1416 while (i-- > 0) 1417 phy_driver_unregister(new_driver + i); 1418 break; 1419 } 1420 } 1421 return ret; 1422} 1423EXPORT_SYMBOL(phy_drivers_register); 1424 1425void phy_driver_unregister(struct phy_driver *drv) 1426{ 1427 driver_unregister(&drv->driver); 1428} 1429EXPORT_SYMBOL(phy_driver_unregister); 1430 1431void phy_drivers_unregister(struct phy_driver *drv, int n) 1432{ 1433 int i; 1434 1435 for (i = 0; i < n; i++) 1436 phy_driver_unregister(drv + i); 1437} 1438EXPORT_SYMBOL(phy_drivers_unregister); 1439 1440static struct phy_driver genphy_driver[] = { 1441{ 1442 .phy_id = 0xffffffff, 1443 .phy_id_mask = 0xffffffff, 1444 .name = "Generic PHY", 1445 .soft_reset = genphy_soft_reset, 1446 .config_init = genphy_config_init, 1447 .features = PHY_GBIT_FEATURES | SUPPORTED_MII | 1448 SUPPORTED_AUI | SUPPORTED_FIBRE | 1449 SUPPORTED_BNC, 1450 .config_aneg = genphy_config_aneg, 1451 .aneg_done = genphy_aneg_done, 1452 .read_status = genphy_read_status, 1453 .suspend = genphy_suspend, 1454 .resume = genphy_resume, 1455 .driver = { .owner = THIS_MODULE, }, 1456}, { 1457 .phy_id = 0xffffffff, 1458 .phy_id_mask = 0xffffffff, 1459 .name = "Generic 10G PHY", 1460 .soft_reset = gen10g_soft_reset, 1461 .config_init = gen10g_config_init, 1462 .features = 0, 1463 .config_aneg = gen10g_config_aneg, 1464 .read_status = gen10g_read_status, 1465 .suspend = gen10g_suspend, 1466 .resume = gen10g_resume, 1467 .driver = {.owner = THIS_MODULE, }, 1468} }; 1469 1470static int __init phy_init(void) 1471{ 1472 int rc; 1473 1474 rc = mdio_bus_init(); 1475 if (rc) 1476 return rc; 1477 1478 rc = phy_drivers_register(genphy_driver, 1479 ARRAY_SIZE(genphy_driver)); 1480 if (rc) 1481 mdio_bus_exit(); 1482 1483 return rc; 1484} 1485 1486static void __exit phy_exit(void) 1487{ 1488 phy_drivers_unregister(genphy_driver, 1489 ARRAY_SIZE(genphy_driver)); 1490 mdio_bus_exit(); 1491} 1492 1493subsys_initcall(phy_init); 1494module_exit(phy_exit); 1495