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 40 MODULE_DESCRIPTION("PHY library"); 41 MODULE_AUTHOR("Andy Fleming"); 42 MODULE_LICENSE("GPL"); 43 44 void phy_device_free(struct phy_device *phydev) 45 { 46 put_device(&phydev->mdio.dev); 47 } 48 EXPORT_SYMBOL(phy_device_free); 49 50 static void phy_mdio_device_free(struct mdio_device *mdiodev) 51 { 52 struct phy_device *phydev; 53 54 phydev = container_of(mdiodev, struct phy_device, mdio); 55 phy_device_free(phydev); 56 } 57 58 static void phy_device_release(struct device *dev) 59 { 60 kfree(to_phy_device(dev)); 61 } 62 63 static void phy_mdio_device_remove(struct mdio_device *mdiodev) 64 { 65 struct phy_device *phydev; 66 67 phydev = container_of(mdiodev, struct phy_device, mdio); 68 phy_device_remove(phydev); 69 } 70 71 enum genphy_driver { 72 GENPHY_DRV_1G, 73 GENPHY_DRV_10G, 74 GENPHY_DRV_MAX 75 }; 76 77 static struct phy_driver genphy_driver[GENPHY_DRV_MAX]; 78 79 static LIST_HEAD(phy_fixup_list); 80 static DEFINE_MUTEX(phy_fixup_lock); 81 82 #ifdef CONFIG_PM 83 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) 84 { 85 struct device_driver *drv = phydev->mdio.dev.driver; 86 struct phy_driver *phydrv = to_phy_driver(drv); 87 struct net_device *netdev = phydev->attached_dev; 88 89 if (!drv || !phydrv->suspend) 90 return false; 91 92 /* PHY not attached? May suspend if the PHY has not already been 93 * suspended as part of a prior call to phy_disconnect() -> 94 * phy_detach() -> phy_suspend() because the parent netdev might be the 95 * MDIO bus driver and clock gated at this point. 96 */ 97 if (!netdev) 98 return !phydev->suspended; 99 100 /* Don't suspend PHY if the attached netdev parent may wakeup. 101 * The parent may point to a PCI device, as in tg3 driver. 102 */ 103 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) 104 return false; 105 106 /* Also don't suspend PHY if the netdev itself may wakeup. This 107 * is the case for devices w/o underlaying pwr. mgmt. aware bus, 108 * e.g. SoC devices. 109 */ 110 if (device_may_wakeup(&netdev->dev)) 111 return false; 112 113 return true; 114 } 115 116 static int mdio_bus_phy_suspend(struct device *dev) 117 { 118 struct phy_device *phydev = to_phy_device(dev); 119 120 /* We must stop the state machine manually, otherwise it stops out of 121 * control, possibly with the phydev->lock held. Upon resume, netdev 122 * may call phy routines that try to grab the same lock, and that may 123 * lead to a deadlock. 124 */ 125 if (phydev->attached_dev && phydev->adjust_link) 126 phy_stop_machine(phydev); 127 128 if (!mdio_bus_phy_may_suspend(phydev)) 129 return 0; 130 131 return phy_suspend(phydev); 132 } 133 134 static int mdio_bus_phy_resume(struct device *dev) 135 { 136 struct phy_device *phydev = to_phy_device(dev); 137 int ret; 138 139 if (!mdio_bus_phy_may_suspend(phydev)) 140 goto no_resume; 141 142 ret = phy_resume(phydev); 143 if (ret < 0) 144 return ret; 145 146 no_resume: 147 if (phydev->attached_dev && phydev->adjust_link) 148 phy_start_machine(phydev); 149 150 return 0; 151 } 152 153 static int mdio_bus_phy_restore(struct device *dev) 154 { 155 struct phy_device *phydev = to_phy_device(dev); 156 struct net_device *netdev = phydev->attached_dev; 157 int ret; 158 159 if (!netdev) 160 return 0; 161 162 ret = phy_init_hw(phydev); 163 if (ret < 0) 164 return ret; 165 166 /* The PHY needs to renegotiate. */ 167 phydev->link = 0; 168 phydev->state = PHY_UP; 169 170 phy_start_machine(phydev); 171 172 return 0; 173 } 174 175 static const struct dev_pm_ops mdio_bus_phy_pm_ops = { 176 .suspend = mdio_bus_phy_suspend, 177 .resume = mdio_bus_phy_resume, 178 .freeze = mdio_bus_phy_suspend, 179 .thaw = mdio_bus_phy_resume, 180 .restore = mdio_bus_phy_restore, 181 }; 182 183 #define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops) 184 185 #else 186 187 #define MDIO_BUS_PHY_PM_OPS NULL 188 189 #endif /* CONFIG_PM */ 190 191 /** 192 * phy_register_fixup - creates a new phy_fixup and adds it to the list 193 * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID) 194 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) 195 * It can also be PHY_ANY_UID 196 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before 197 * comparison 198 * @run: The actual code to be run when a matching PHY is found 199 */ 200 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, 201 int (*run)(struct phy_device *)) 202 { 203 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); 204 205 if (!fixup) 206 return -ENOMEM; 207 208 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); 209 fixup->phy_uid = phy_uid; 210 fixup->phy_uid_mask = phy_uid_mask; 211 fixup->run = run; 212 213 mutex_lock(&phy_fixup_lock); 214 list_add_tail(&fixup->list, &phy_fixup_list); 215 mutex_unlock(&phy_fixup_lock); 216 217 return 0; 218 } 219 EXPORT_SYMBOL(phy_register_fixup); 220 221 /* Registers a fixup to be run on any PHY with the UID in phy_uid */ 222 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, 223 int (*run)(struct phy_device *)) 224 { 225 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); 226 } 227 EXPORT_SYMBOL(phy_register_fixup_for_uid); 228 229 /* Registers a fixup to be run on the PHY with id string bus_id */ 230 int phy_register_fixup_for_id(const char *bus_id, 231 int (*run)(struct phy_device *)) 232 { 233 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); 234 } 235 EXPORT_SYMBOL(phy_register_fixup_for_id); 236 237 /* Returns 1 if fixup matches phydev in bus_id and phy_uid. 238 * Fixups can be set to match any in one or more fields. 239 */ 240 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) 241 { 242 if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0) 243 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) 244 return 0; 245 246 if ((fixup->phy_uid & fixup->phy_uid_mask) != 247 (phydev->phy_id & fixup->phy_uid_mask)) 248 if (fixup->phy_uid != PHY_ANY_UID) 249 return 0; 250 251 return 1; 252 } 253 254 /* Runs any matching fixups for this phydev */ 255 static int phy_scan_fixups(struct phy_device *phydev) 256 { 257 struct phy_fixup *fixup; 258 259 mutex_lock(&phy_fixup_lock); 260 list_for_each_entry(fixup, &phy_fixup_list, list) { 261 if (phy_needs_fixup(phydev, fixup)) { 262 int err = fixup->run(phydev); 263 264 if (err < 0) { 265 mutex_unlock(&phy_fixup_lock); 266 return err; 267 } 268 phydev->has_fixups = true; 269 } 270 } 271 mutex_unlock(&phy_fixup_lock); 272 273 return 0; 274 } 275 276 static int phy_bus_match(struct device *dev, struct device_driver *drv) 277 { 278 struct phy_device *phydev = to_phy_device(dev); 279 struct phy_driver *phydrv = to_phy_driver(drv); 280 const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids); 281 int i; 282 283 if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)) 284 return 0; 285 286 if (phydrv->match_phy_device) 287 return phydrv->match_phy_device(phydev); 288 289 if (phydev->is_c45) { 290 for (i = 1; i < num_ids; i++) { 291 if (!(phydev->c45_ids.devices_in_package & (1 << i))) 292 continue; 293 294 if ((phydrv->phy_id & phydrv->phy_id_mask) == 295 (phydev->c45_ids.device_ids[i] & 296 phydrv->phy_id_mask)) 297 return 1; 298 } 299 return 0; 300 } else { 301 return (phydrv->phy_id & phydrv->phy_id_mask) == 302 (phydev->phy_id & phydrv->phy_id_mask); 303 } 304 } 305 306 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id, 307 bool is_c45, 308 struct phy_c45_device_ids *c45_ids) 309 { 310 struct phy_device *dev; 311 struct mdio_device *mdiodev; 312 313 /* We allocate the device, and initialize the default values */ 314 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 315 if (!dev) 316 return ERR_PTR(-ENOMEM); 317 318 mdiodev = &dev->mdio; 319 mdiodev->dev.release = phy_device_release; 320 mdiodev->dev.parent = &bus->dev; 321 mdiodev->dev.bus = &mdio_bus_type; 322 mdiodev->bus = bus; 323 mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS; 324 mdiodev->bus_match = phy_bus_match; 325 mdiodev->addr = addr; 326 mdiodev->flags = MDIO_DEVICE_FLAG_PHY; 327 mdiodev->device_free = phy_mdio_device_free; 328 mdiodev->device_remove = phy_mdio_device_remove; 329 330 dev->speed = 0; 331 dev->duplex = -1; 332 dev->pause = 0; 333 dev->asym_pause = 0; 334 dev->link = 1; 335 dev->interface = PHY_INTERFACE_MODE_GMII; 336 337 dev->autoneg = AUTONEG_ENABLE; 338 339 dev->is_c45 = is_c45; 340 dev->phy_id = phy_id; 341 if (c45_ids) 342 dev->c45_ids = *c45_ids; 343 dev->irq = bus->irq[addr]; 344 dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); 345 346 dev->state = PHY_DOWN; 347 348 mutex_init(&dev->lock); 349 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); 350 INIT_WORK(&dev->phy_queue, phy_change); 351 352 /* Request the appropriate module unconditionally; don't 353 * bother trying to do so only if it isn't already loaded, 354 * because that gets complicated. A hotplug event would have 355 * done an unconditional modprobe anyway. 356 * We don't do normal hotplug because it won't work for MDIO 357 * -- because it relies on the device staying around for long 358 * enough for the driver to get loaded. With MDIO, the NIC 359 * driver will get bored and give up as soon as it finds that 360 * there's no driver _already_ loaded. 361 */ 362 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id)); 363 364 device_initialize(&mdiodev->dev); 365 366 return dev; 367 } 368 EXPORT_SYMBOL(phy_device_create); 369 370 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers. 371 * @bus: the target MII bus 372 * @addr: PHY address on the MII bus 373 * @dev_addr: MMD address in the PHY. 374 * @devices_in_package: where to store the devices in package information. 375 * 376 * Description: reads devices in package registers of a MMD at @dev_addr 377 * from PHY at @addr on @bus. 378 * 379 * Returns: 0 on success, -EIO on failure. 380 */ 381 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr, 382 u32 *devices_in_package) 383 { 384 int phy_reg, reg_addr; 385 386 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2; 387 phy_reg = mdiobus_read(bus, addr, reg_addr); 388 if (phy_reg < 0) 389 return -EIO; 390 *devices_in_package = (phy_reg & 0xffff) << 16; 391 392 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1; 393 phy_reg = mdiobus_read(bus, addr, reg_addr); 394 if (phy_reg < 0) 395 return -EIO; 396 *devices_in_package |= (phy_reg & 0xffff); 397 398 return 0; 399 } 400 401 /** 402 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs. 403 * @bus: the target MII bus 404 * @addr: PHY address on the MII bus 405 * @phy_id: where to store the ID retrieved. 406 * @c45_ids: where to store the c45 ID information. 407 * 408 * If the PHY devices-in-package appears to be valid, it and the 409 * corresponding identifiers are stored in @c45_ids, zero is stored 410 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns 411 * zero on success. 412 * 413 */ 414 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id, 415 struct phy_c45_device_ids *c45_ids) { 416 int phy_reg; 417 int i, reg_addr; 418 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 419 u32 *devs = &c45_ids->devices_in_package; 420 421 /* Find first non-zero Devices In package. Device zero is reserved 422 * for 802.3 c45 complied PHYs, so don't probe it at first. 423 */ 424 for (i = 1; i < num_ids && *devs == 0; i++) { 425 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs); 426 if (phy_reg < 0) 427 return -EIO; 428 429 if ((*devs & 0x1fffffff) == 0x1fffffff) { 430 /* If mostly Fs, there is no device there, 431 * then let's continue to probe more, as some 432 * 10G PHYs have zero Devices In package, 433 * e.g. Cortina CS4315/CS4340 PHY. 434 */ 435 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs); 436 if (phy_reg < 0) 437 return -EIO; 438 /* no device there, let's get out of here */ 439 if ((*devs & 0x1fffffff) == 0x1fffffff) { 440 *phy_id = 0xffffffff; 441 return 0; 442 } else { 443 break; 444 } 445 } 446 } 447 448 /* Now probe Device Identifiers for each device present. */ 449 for (i = 1; i < num_ids; i++) { 450 if (!(c45_ids->devices_in_package & (1 << i))) 451 continue; 452 453 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1; 454 phy_reg = mdiobus_read(bus, addr, reg_addr); 455 if (phy_reg < 0) 456 return -EIO; 457 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16; 458 459 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2; 460 phy_reg = mdiobus_read(bus, addr, reg_addr); 461 if (phy_reg < 0) 462 return -EIO; 463 c45_ids->device_ids[i] |= (phy_reg & 0xffff); 464 } 465 *phy_id = 0; 466 return 0; 467 } 468 469 /** 470 * get_phy_id - reads the specified addr for its ID. 471 * @bus: the target MII bus 472 * @addr: PHY address on the MII bus 473 * @phy_id: where to store the ID retrieved. 474 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 475 * @c45_ids: where to store the c45 ID information. 476 * 477 * Description: In the case of a 802.3-c22 PHY, reads the ID registers 478 * of the PHY at @addr on the @bus, stores it in @phy_id and returns 479 * zero on success. 480 * 481 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and 482 * its return value is in turn returned. 483 * 484 */ 485 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id, 486 bool is_c45, struct phy_c45_device_ids *c45_ids) 487 { 488 int phy_reg; 489 490 if (is_c45) 491 return get_phy_c45_ids(bus, addr, phy_id, c45_ids); 492 493 /* Grab the bits from PHYIR1, and put them in the upper half */ 494 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1); 495 if (phy_reg < 0) 496 return -EIO; 497 498 *phy_id = (phy_reg & 0xffff) << 16; 499 500 /* Grab the bits from PHYIR2, and put them in the lower half */ 501 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2); 502 if (phy_reg < 0) 503 return -EIO; 504 505 *phy_id |= (phy_reg & 0xffff); 506 507 return 0; 508 } 509 510 /** 511 * get_phy_device - reads the specified PHY device and returns its @phy_device 512 * struct 513 * @bus: the target MII bus 514 * @addr: PHY address on the MII bus 515 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 516 * 517 * Description: Reads the ID registers of the PHY at @addr on the 518 * @bus, then allocates and returns the phy_device to represent it. 519 */ 520 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45) 521 { 522 struct phy_c45_device_ids c45_ids = {0}; 523 u32 phy_id = 0; 524 int r; 525 526 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids); 527 if (r) 528 return ERR_PTR(r); 529 530 /* If the phy_id is mostly Fs, there is no device there */ 531 if ((phy_id & 0x1fffffff) == 0x1fffffff) 532 return ERR_PTR(-ENODEV); 533 534 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids); 535 } 536 EXPORT_SYMBOL(get_phy_device); 537 538 static ssize_t 539 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf) 540 { 541 struct phy_device *phydev = to_phy_device(dev); 542 543 return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id); 544 } 545 static DEVICE_ATTR_RO(phy_id); 546 547 static ssize_t 548 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf) 549 { 550 struct phy_device *phydev = to_phy_device(dev); 551 const char *mode = NULL; 552 553 if (phy_is_internal(phydev)) 554 mode = "internal"; 555 else 556 mode = phy_modes(phydev->interface); 557 558 return sprintf(buf, "%s\n", mode); 559 } 560 static DEVICE_ATTR_RO(phy_interface); 561 562 static ssize_t 563 phy_has_fixups_show(struct device *dev, struct device_attribute *attr, 564 char *buf) 565 { 566 struct phy_device *phydev = to_phy_device(dev); 567 568 return sprintf(buf, "%d\n", phydev->has_fixups); 569 } 570 static DEVICE_ATTR_RO(phy_has_fixups); 571 572 static struct attribute *phy_dev_attrs[] = { 573 &dev_attr_phy_id.attr, 574 &dev_attr_phy_interface.attr, 575 &dev_attr_phy_has_fixups.attr, 576 NULL, 577 }; 578 ATTRIBUTE_GROUPS(phy_dev); 579 580 /** 581 * phy_device_register - Register the phy device on the MDIO bus 582 * @phydev: phy_device structure to be added to the MDIO bus 583 */ 584 int phy_device_register(struct phy_device *phydev) 585 { 586 int err; 587 588 err = mdiobus_register_device(&phydev->mdio); 589 if (err) 590 return err; 591 592 /* Run all of the fixups for this PHY */ 593 err = phy_scan_fixups(phydev); 594 if (err) { 595 pr_err("PHY %d failed to initialize\n", phydev->mdio.addr); 596 goto out; 597 } 598 599 phydev->mdio.dev.groups = phy_dev_groups; 600 601 err = device_add(&phydev->mdio.dev); 602 if (err) { 603 pr_err("PHY %d failed to add\n", phydev->mdio.addr); 604 goto out; 605 } 606 607 return 0; 608 609 out: 610 mdiobus_unregister_device(&phydev->mdio); 611 return err; 612 } 613 EXPORT_SYMBOL(phy_device_register); 614 615 /** 616 * phy_device_remove - Remove a previously registered phy device from the MDIO bus 617 * @phydev: phy_device structure to remove 618 * 619 * This doesn't free the phy_device itself, it merely reverses the effects 620 * of phy_device_register(). Use phy_device_free() to free the device 621 * after calling this function. 622 */ 623 void phy_device_remove(struct phy_device *phydev) 624 { 625 device_del(&phydev->mdio.dev); 626 mdiobus_unregister_device(&phydev->mdio); 627 } 628 EXPORT_SYMBOL(phy_device_remove); 629 630 /** 631 * phy_find_first - finds the first PHY device on the bus 632 * @bus: the target MII bus 633 */ 634 struct phy_device *phy_find_first(struct mii_bus *bus) 635 { 636 struct phy_device *phydev; 637 int addr; 638 639 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 640 phydev = mdiobus_get_phy(bus, addr); 641 if (phydev) 642 return phydev; 643 } 644 return NULL; 645 } 646 EXPORT_SYMBOL(phy_find_first); 647 648 /** 649 * phy_prepare_link - prepares the PHY layer to monitor link status 650 * @phydev: target phy_device struct 651 * @handler: callback function for link status change notifications 652 * 653 * Description: Tells the PHY infrastructure to handle the 654 * gory details on monitoring link status (whether through 655 * polling or an interrupt), and to call back to the 656 * connected device driver when the link status changes. 657 * If you want to monitor your own link state, don't call 658 * this function. 659 */ 660 static void phy_prepare_link(struct phy_device *phydev, 661 void (*handler)(struct net_device *)) 662 { 663 phydev->adjust_link = handler; 664 } 665 666 /** 667 * phy_connect_direct - connect an ethernet device to a specific phy_device 668 * @dev: the network device to connect 669 * @phydev: the pointer to the phy device 670 * @handler: callback function for state change notifications 671 * @interface: PHY device's interface 672 */ 673 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev, 674 void (*handler)(struct net_device *), 675 phy_interface_t interface) 676 { 677 int rc; 678 679 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 680 if (rc) 681 return rc; 682 683 phy_prepare_link(phydev, handler); 684 phy_start_machine(phydev); 685 if (phydev->irq > 0) 686 phy_start_interrupts(phydev); 687 688 return 0; 689 } 690 EXPORT_SYMBOL(phy_connect_direct); 691 692 /** 693 * phy_connect - connect an ethernet device to a PHY device 694 * @dev: the network device to connect 695 * @bus_id: the id string of the PHY device to connect 696 * @handler: callback function for state change notifications 697 * @interface: PHY device's interface 698 * 699 * Description: Convenience function for connecting ethernet 700 * devices to PHY devices. The default behavior is for 701 * the PHY infrastructure to handle everything, and only notify 702 * the connected driver when the link status changes. If you 703 * don't want, or can't use the provided functionality, you may 704 * choose to call only the subset of functions which provide 705 * the desired functionality. 706 */ 707 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id, 708 void (*handler)(struct net_device *), 709 phy_interface_t interface) 710 { 711 struct phy_device *phydev; 712 struct device *d; 713 int rc; 714 715 /* Search the list of PHY devices on the mdio bus for the 716 * PHY with the requested name 717 */ 718 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id); 719 if (!d) { 720 pr_err("PHY %s not found\n", bus_id); 721 return ERR_PTR(-ENODEV); 722 } 723 phydev = to_phy_device(d); 724 725 rc = phy_connect_direct(dev, phydev, handler, interface); 726 if (rc) 727 return ERR_PTR(rc); 728 729 return phydev; 730 } 731 EXPORT_SYMBOL(phy_connect); 732 733 /** 734 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY 735 * device 736 * @phydev: target phy_device struct 737 */ 738 void phy_disconnect(struct phy_device *phydev) 739 { 740 if (phydev->irq > 0) 741 phy_stop_interrupts(phydev); 742 743 phy_stop_machine(phydev); 744 745 phydev->adjust_link = NULL; 746 747 phy_detach(phydev); 748 } 749 EXPORT_SYMBOL(phy_disconnect); 750 751 /** 752 * phy_poll_reset - Safely wait until a PHY reset has properly completed 753 * @phydev: The PHY device to poll 754 * 755 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as 756 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR 757 * register must be polled until the BMCR_RESET bit clears. 758 * 759 * Furthermore, any attempts to write to PHY registers may have no effect 760 * or even generate MDIO bus errors until this is complete. 761 * 762 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the 763 * standard and do not fully reset after the BMCR_RESET bit is set, and may 764 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an 765 * effort to support such broken PHYs, this function is separate from the 766 * standard phy_init_hw() which will zero all the other bits in the BMCR 767 * and reapply all driver-specific and board-specific fixups. 768 */ 769 static int phy_poll_reset(struct phy_device *phydev) 770 { 771 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ 772 unsigned int retries = 12; 773 int ret; 774 775 do { 776 msleep(50); 777 ret = phy_read(phydev, MII_BMCR); 778 if (ret < 0) 779 return ret; 780 } while (ret & BMCR_RESET && --retries); 781 if (ret & BMCR_RESET) 782 return -ETIMEDOUT; 783 784 /* Some chips (smsc911x) may still need up to another 1ms after the 785 * BMCR_RESET bit is cleared before they are usable. 786 */ 787 msleep(1); 788 return 0; 789 } 790 791 int phy_init_hw(struct phy_device *phydev) 792 { 793 int ret = 0; 794 795 if (!phydev->drv || !phydev->drv->config_init) 796 return 0; 797 798 if (phydev->drv->soft_reset) 799 ret = phydev->drv->soft_reset(phydev); 800 else 801 ret = genphy_soft_reset(phydev); 802 803 if (ret < 0) 804 return ret; 805 806 ret = phy_scan_fixups(phydev); 807 if (ret < 0) 808 return ret; 809 810 return phydev->drv->config_init(phydev); 811 } 812 EXPORT_SYMBOL(phy_init_hw); 813 814 void phy_attached_info(struct phy_device *phydev) 815 { 816 phy_attached_print(phydev, NULL); 817 } 818 EXPORT_SYMBOL(phy_attached_info); 819 820 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)" 821 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...) 822 { 823 if (!fmt) { 824 dev_info(&phydev->mdio.dev, ATTACHED_FMT "\n", 825 phydev->drv->name, phydev_name(phydev), 826 phydev->irq); 827 } else { 828 va_list ap; 829 830 dev_info(&phydev->mdio.dev, ATTACHED_FMT, 831 phydev->drv->name, phydev_name(phydev), 832 phydev->irq); 833 834 va_start(ap, fmt); 835 vprintk(fmt, ap); 836 va_end(ap); 837 } 838 } 839 EXPORT_SYMBOL(phy_attached_print); 840 841 /** 842 * phy_attach_direct - attach a network device to a given PHY device pointer 843 * @dev: network device to attach 844 * @phydev: Pointer to phy_device to attach 845 * @flags: PHY device's dev_flags 846 * @interface: PHY device's interface 847 * 848 * Description: Called by drivers to attach to a particular PHY 849 * device. The phy_device is found, and properly hooked up 850 * to the phy_driver. If no driver is attached, then a 851 * generic driver is used. The phy_device is given a ptr to 852 * the attaching device, and given a callback for link status 853 * change. The phy_device is returned to the attaching driver. 854 * This function takes a reference on the phy device. 855 */ 856 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 857 u32 flags, phy_interface_t interface) 858 { 859 struct mii_bus *bus = phydev->mdio.bus; 860 struct device *d = &phydev->mdio.dev; 861 int err; 862 863 if (!try_module_get(bus->owner)) { 864 dev_err(&dev->dev, "failed to get the bus module\n"); 865 return -EIO; 866 } 867 868 get_device(d); 869 870 /* Assume that if there is no driver, that it doesn't 871 * exist, and we should use the genphy driver. 872 */ 873 if (!d->driver) { 874 if (phydev->is_c45) 875 d->driver = 876 &genphy_driver[GENPHY_DRV_10G].mdiodrv.driver; 877 else 878 d->driver = 879 &genphy_driver[GENPHY_DRV_1G].mdiodrv.driver; 880 881 err = d->driver->probe(d); 882 if (err >= 0) 883 err = device_bind_driver(d); 884 885 if (err) 886 goto error; 887 } 888 889 if (phydev->attached_dev) { 890 dev_err(&dev->dev, "PHY already attached\n"); 891 err = -EBUSY; 892 goto error; 893 } 894 895 phydev->attached_dev = dev; 896 dev->phydev = phydev; 897 898 phydev->dev_flags = flags; 899 900 phydev->interface = interface; 901 902 phydev->state = PHY_READY; 903 904 /* Initial carrier state is off as the phy is about to be 905 * (re)initialized. 906 */ 907 netif_carrier_off(phydev->attached_dev); 908 909 /* Do initial configuration here, now that 910 * we have certain key parameters 911 * (dev_flags and interface) 912 */ 913 err = phy_init_hw(phydev); 914 if (err) 915 phy_detach(phydev); 916 else 917 phy_resume(phydev); 918 919 return err; 920 921 error: 922 put_device(d); 923 module_put(bus->owner); 924 return err; 925 } 926 EXPORT_SYMBOL(phy_attach_direct); 927 928 /** 929 * phy_attach - attach a network device to a particular PHY device 930 * @dev: network device to attach 931 * @bus_id: Bus ID of PHY device to attach 932 * @interface: PHY device's interface 933 * 934 * Description: Same as phy_attach_direct() except that a PHY bus_id 935 * string is passed instead of a pointer to a struct phy_device. 936 */ 937 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 938 phy_interface_t interface) 939 { 940 struct bus_type *bus = &mdio_bus_type; 941 struct phy_device *phydev; 942 struct device *d; 943 int rc; 944 945 /* Search the list of PHY devices on the mdio bus for the 946 * PHY with the requested name 947 */ 948 d = bus_find_device_by_name(bus, NULL, bus_id); 949 if (!d) { 950 pr_err("PHY %s not found\n", bus_id); 951 return ERR_PTR(-ENODEV); 952 } 953 phydev = to_phy_device(d); 954 955 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 956 if (rc) 957 return ERR_PTR(rc); 958 959 return phydev; 960 } 961 EXPORT_SYMBOL(phy_attach); 962 963 /** 964 * phy_detach - detach a PHY device from its network device 965 * @phydev: target phy_device struct 966 * 967 * This detaches the phy device from its network device and the phy 968 * driver, and drops the reference count taken in phy_attach_direct(). 969 */ 970 void phy_detach(struct phy_device *phydev) 971 { 972 struct mii_bus *bus; 973 int i; 974 975 phydev->attached_dev->phydev = NULL; 976 phydev->attached_dev = NULL; 977 phy_suspend(phydev); 978 979 /* If the device had no specific driver before (i.e. - it 980 * was using the generic driver), we unbind the device 981 * from the generic driver so that there's a chance a 982 * real driver could be loaded 983 */ 984 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) { 985 if (phydev->mdio.dev.driver == 986 &genphy_driver[i].mdiodrv.driver) { 987 device_release_driver(&phydev->mdio.dev); 988 break; 989 } 990 } 991 992 /* 993 * The phydev might go away on the put_device() below, so avoid 994 * a use-after-free bug by reading the underlying bus first. 995 */ 996 bus = phydev->mdio.bus; 997 998 put_device(&phydev->mdio.dev); 999 module_put(bus->owner); 1000 } 1001 EXPORT_SYMBOL(phy_detach); 1002 1003 int phy_suspend(struct phy_device *phydev) 1004 { 1005 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1006 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 1007 int ret = 0; 1008 1009 /* If the device has WOL enabled, we cannot suspend the PHY */ 1010 phy_ethtool_get_wol(phydev, &wol); 1011 if (wol.wolopts) 1012 return -EBUSY; 1013 1014 if (phydrv->suspend) 1015 ret = phydrv->suspend(phydev); 1016 1017 if (ret) 1018 return ret; 1019 1020 phydev->suspended = true; 1021 1022 return ret; 1023 } 1024 EXPORT_SYMBOL(phy_suspend); 1025 1026 int phy_resume(struct phy_device *phydev) 1027 { 1028 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1029 int ret = 0; 1030 1031 if (phydrv->resume) 1032 ret = phydrv->resume(phydev); 1033 1034 if (ret) 1035 return ret; 1036 1037 phydev->suspended = false; 1038 1039 return ret; 1040 } 1041 EXPORT_SYMBOL(phy_resume); 1042 1043 /* Generic PHY support and helper functions */ 1044 1045 /** 1046 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 1047 * @phydev: target phy_device struct 1048 * 1049 * Description: Writes MII_ADVERTISE with the appropriate values, 1050 * after sanitizing the values to make sure we only advertise 1051 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1052 * hasn't changed, and > 0 if it has changed. 1053 */ 1054 static int genphy_config_advert(struct phy_device *phydev) 1055 { 1056 u32 advertise; 1057 int oldadv, adv, bmsr; 1058 int err, changed = 0; 1059 1060 /* Only allow advertising what this PHY supports */ 1061 phydev->advertising &= phydev->supported; 1062 advertise = phydev->advertising; 1063 1064 /* Setup standard advertisement */ 1065 adv = phy_read(phydev, MII_ADVERTISE); 1066 if (adv < 0) 1067 return adv; 1068 1069 oldadv = adv; 1070 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | 1071 ADVERTISE_PAUSE_ASYM); 1072 adv |= ethtool_adv_to_mii_adv_t(advertise); 1073 1074 if (adv != oldadv) { 1075 err = phy_write(phydev, MII_ADVERTISE, adv); 1076 1077 if (err < 0) 1078 return err; 1079 changed = 1; 1080 } 1081 1082 bmsr = phy_read(phydev, MII_BMSR); 1083 if (bmsr < 0) 1084 return bmsr; 1085 1086 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 1087 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 1088 * logical 1. 1089 */ 1090 if (!(bmsr & BMSR_ESTATEN)) 1091 return changed; 1092 1093 /* Configure gigabit if it's supported */ 1094 adv = phy_read(phydev, MII_CTRL1000); 1095 if (adv < 0) 1096 return adv; 1097 1098 oldadv = adv; 1099 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); 1100 1101 if (phydev->supported & (SUPPORTED_1000baseT_Half | 1102 SUPPORTED_1000baseT_Full)) { 1103 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise); 1104 } 1105 1106 if (adv != oldadv) 1107 changed = 1; 1108 1109 err = phy_write(phydev, MII_CTRL1000, adv); 1110 if (err < 0) 1111 return err; 1112 1113 return changed; 1114 } 1115 1116 /** 1117 * genphy_setup_forced - configures/forces speed/duplex from @phydev 1118 * @phydev: target phy_device struct 1119 * 1120 * Description: Configures MII_BMCR to force speed/duplex 1121 * to the values in phydev. Assumes that the values are valid. 1122 * Please see phy_sanitize_settings(). 1123 */ 1124 int genphy_setup_forced(struct phy_device *phydev) 1125 { 1126 int ctl = phy_read(phydev, MII_BMCR); 1127 1128 ctl &= BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN; 1129 phydev->pause = 0; 1130 phydev->asym_pause = 0; 1131 1132 if (SPEED_1000 == phydev->speed) 1133 ctl |= BMCR_SPEED1000; 1134 else if (SPEED_100 == phydev->speed) 1135 ctl |= BMCR_SPEED100; 1136 1137 if (DUPLEX_FULL == phydev->duplex) 1138 ctl |= BMCR_FULLDPLX; 1139 1140 return phy_write(phydev, MII_BMCR, ctl); 1141 } 1142 EXPORT_SYMBOL(genphy_setup_forced); 1143 1144 /** 1145 * genphy_restart_aneg - Enable and Restart Autonegotiation 1146 * @phydev: target phy_device struct 1147 */ 1148 int genphy_restart_aneg(struct phy_device *phydev) 1149 { 1150 int ctl = phy_read(phydev, MII_BMCR); 1151 1152 if (ctl < 0) 1153 return ctl; 1154 1155 ctl |= BMCR_ANENABLE | BMCR_ANRESTART; 1156 1157 /* Don't isolate the PHY if we're negotiating */ 1158 ctl &= ~BMCR_ISOLATE; 1159 1160 return phy_write(phydev, MII_BMCR, ctl); 1161 } 1162 EXPORT_SYMBOL(genphy_restart_aneg); 1163 1164 /** 1165 * genphy_config_aneg - restart auto-negotiation or write BMCR 1166 * @phydev: target phy_device struct 1167 * 1168 * Description: If auto-negotiation is enabled, we configure the 1169 * advertising, and then restart auto-negotiation. If it is not 1170 * enabled, then we write the BMCR. 1171 */ 1172 int genphy_config_aneg(struct phy_device *phydev) 1173 { 1174 int result; 1175 1176 if (AUTONEG_ENABLE != phydev->autoneg) 1177 return genphy_setup_forced(phydev); 1178 1179 result = genphy_config_advert(phydev); 1180 if (result < 0) /* error */ 1181 return result; 1182 if (result == 0) { 1183 /* Advertisement hasn't changed, but maybe aneg was never on to 1184 * begin with? Or maybe phy was isolated? 1185 */ 1186 int ctl = phy_read(phydev, MII_BMCR); 1187 1188 if (ctl < 0) 1189 return ctl; 1190 1191 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 1192 result = 1; /* do restart aneg */ 1193 } 1194 1195 /* Only restart aneg if we are advertising something different 1196 * than we were before. 1197 */ 1198 if (result > 0) 1199 result = genphy_restart_aneg(phydev); 1200 1201 return result; 1202 } 1203 EXPORT_SYMBOL(genphy_config_aneg); 1204 1205 /** 1206 * genphy_aneg_done - return auto-negotiation status 1207 * @phydev: target phy_device struct 1208 * 1209 * Description: Reads the status register and returns 0 either if 1210 * auto-negotiation is incomplete, or if there was an error. 1211 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 1212 */ 1213 int genphy_aneg_done(struct phy_device *phydev) 1214 { 1215 int retval = phy_read(phydev, MII_BMSR); 1216 1217 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 1218 } 1219 EXPORT_SYMBOL(genphy_aneg_done); 1220 1221 static int gen10g_config_aneg(struct phy_device *phydev) 1222 { 1223 return 0; 1224 } 1225 1226 /** 1227 * genphy_update_link - update link status in @phydev 1228 * @phydev: target phy_device struct 1229 * 1230 * Description: Update the value in phydev->link to reflect the 1231 * current link value. In order to do this, we need to read 1232 * the status register twice, keeping the second value. 1233 */ 1234 int genphy_update_link(struct phy_device *phydev) 1235 { 1236 int status; 1237 1238 /* Do a fake read */ 1239 status = phy_read(phydev, MII_BMSR); 1240 if (status < 0) 1241 return status; 1242 1243 /* Read link and autonegotiation status */ 1244 status = phy_read(phydev, MII_BMSR); 1245 if (status < 0) 1246 return status; 1247 1248 if ((status & BMSR_LSTATUS) == 0) 1249 phydev->link = 0; 1250 else 1251 phydev->link = 1; 1252 1253 return 0; 1254 } 1255 EXPORT_SYMBOL(genphy_update_link); 1256 1257 /** 1258 * genphy_read_status - check the link status and update current link state 1259 * @phydev: target phy_device struct 1260 * 1261 * Description: Check the link, then figure out the current state 1262 * by comparing what we advertise with what the link partner 1263 * advertises. Start by checking the gigabit possibilities, 1264 * then move on to 10/100. 1265 */ 1266 int genphy_read_status(struct phy_device *phydev) 1267 { 1268 int adv; 1269 int err; 1270 int lpa; 1271 int lpagb = 0; 1272 int common_adv; 1273 int common_adv_gb = 0; 1274 1275 /* Update the link, but return if there was an error */ 1276 err = genphy_update_link(phydev); 1277 if (err) 1278 return err; 1279 1280 phydev->lp_advertising = 0; 1281 1282 if (AUTONEG_ENABLE == phydev->autoneg) { 1283 if (phydev->supported & (SUPPORTED_1000baseT_Half 1284 | SUPPORTED_1000baseT_Full)) { 1285 lpagb = phy_read(phydev, MII_STAT1000); 1286 if (lpagb < 0) 1287 return lpagb; 1288 1289 adv = phy_read(phydev, MII_CTRL1000); 1290 if (adv < 0) 1291 return adv; 1292 1293 phydev->lp_advertising = 1294 mii_stat1000_to_ethtool_lpa_t(lpagb); 1295 common_adv_gb = lpagb & adv << 2; 1296 } 1297 1298 lpa = phy_read(phydev, MII_LPA); 1299 if (lpa < 0) 1300 return lpa; 1301 1302 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa); 1303 1304 adv = phy_read(phydev, MII_ADVERTISE); 1305 if (adv < 0) 1306 return adv; 1307 1308 common_adv = lpa & adv; 1309 1310 phydev->speed = SPEED_10; 1311 phydev->duplex = DUPLEX_HALF; 1312 phydev->pause = 0; 1313 phydev->asym_pause = 0; 1314 1315 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) { 1316 phydev->speed = SPEED_1000; 1317 1318 if (common_adv_gb & LPA_1000FULL) 1319 phydev->duplex = DUPLEX_FULL; 1320 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) { 1321 phydev->speed = SPEED_100; 1322 1323 if (common_adv & LPA_100FULL) 1324 phydev->duplex = DUPLEX_FULL; 1325 } else 1326 if (common_adv & LPA_10FULL) 1327 phydev->duplex = DUPLEX_FULL; 1328 1329 if (phydev->duplex == DUPLEX_FULL) { 1330 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0; 1331 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0; 1332 } 1333 } else { 1334 int bmcr = phy_read(phydev, MII_BMCR); 1335 1336 if (bmcr < 0) 1337 return bmcr; 1338 1339 if (bmcr & BMCR_FULLDPLX) 1340 phydev->duplex = DUPLEX_FULL; 1341 else 1342 phydev->duplex = DUPLEX_HALF; 1343 1344 if (bmcr & BMCR_SPEED1000) 1345 phydev->speed = SPEED_1000; 1346 else if (bmcr & BMCR_SPEED100) 1347 phydev->speed = SPEED_100; 1348 else 1349 phydev->speed = SPEED_10; 1350 1351 phydev->pause = 0; 1352 phydev->asym_pause = 0; 1353 } 1354 1355 return 0; 1356 } 1357 EXPORT_SYMBOL(genphy_read_status); 1358 1359 static int gen10g_read_status(struct phy_device *phydev) 1360 { 1361 int devad, reg; 1362 u32 mmd_mask = phydev->c45_ids.devices_in_package; 1363 1364 phydev->link = 1; 1365 1366 /* For now just lie and say it's 10G all the time */ 1367 phydev->speed = SPEED_10000; 1368 phydev->duplex = DUPLEX_FULL; 1369 1370 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) { 1371 if (!(mmd_mask & 1)) 1372 continue; 1373 1374 /* Read twice because link state is latched and a 1375 * read moves the current state into the register 1376 */ 1377 phy_read_mmd(phydev, devad, MDIO_STAT1); 1378 reg = phy_read_mmd(phydev, devad, MDIO_STAT1); 1379 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS)) 1380 phydev->link = 0; 1381 } 1382 1383 return 0; 1384 } 1385 1386 /** 1387 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 1388 * @phydev: target phy_device struct 1389 * 1390 * Description: Perform a software PHY reset using the standard 1391 * BMCR_RESET bit and poll for the reset bit to be cleared. 1392 * 1393 * Returns: 0 on success, < 0 on failure 1394 */ 1395 int genphy_soft_reset(struct phy_device *phydev) 1396 { 1397 int ret; 1398 1399 ret = phy_write(phydev, MII_BMCR, BMCR_RESET); 1400 if (ret < 0) 1401 return ret; 1402 1403 return phy_poll_reset(phydev); 1404 } 1405 EXPORT_SYMBOL(genphy_soft_reset); 1406 1407 int genphy_config_init(struct phy_device *phydev) 1408 { 1409 int val; 1410 u32 features; 1411 1412 features = (SUPPORTED_TP | SUPPORTED_MII 1413 | SUPPORTED_AUI | SUPPORTED_FIBRE | 1414 SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1415 1416 /* Do we support autonegotiation? */ 1417 val = phy_read(phydev, MII_BMSR); 1418 if (val < 0) 1419 return val; 1420 1421 if (val & BMSR_ANEGCAPABLE) 1422 features |= SUPPORTED_Autoneg; 1423 1424 if (val & BMSR_100FULL) 1425 features |= SUPPORTED_100baseT_Full; 1426 if (val & BMSR_100HALF) 1427 features |= SUPPORTED_100baseT_Half; 1428 if (val & BMSR_10FULL) 1429 features |= SUPPORTED_10baseT_Full; 1430 if (val & BMSR_10HALF) 1431 features |= SUPPORTED_10baseT_Half; 1432 1433 if (val & BMSR_ESTATEN) { 1434 val = phy_read(phydev, MII_ESTATUS); 1435 if (val < 0) 1436 return val; 1437 1438 if (val & ESTATUS_1000_TFULL) 1439 features |= SUPPORTED_1000baseT_Full; 1440 if (val & ESTATUS_1000_THALF) 1441 features |= SUPPORTED_1000baseT_Half; 1442 } 1443 1444 phydev->supported &= features; 1445 phydev->advertising &= features; 1446 1447 return 0; 1448 } 1449 1450 static int gen10g_soft_reset(struct phy_device *phydev) 1451 { 1452 /* Do nothing for now */ 1453 return 0; 1454 } 1455 EXPORT_SYMBOL(genphy_config_init); 1456 1457 static int gen10g_config_init(struct phy_device *phydev) 1458 { 1459 /* Temporarily just say we support everything */ 1460 phydev->supported = SUPPORTED_10000baseT_Full; 1461 phydev->advertising = SUPPORTED_10000baseT_Full; 1462 1463 return 0; 1464 } 1465 1466 int genphy_suspend(struct phy_device *phydev) 1467 { 1468 int value; 1469 1470 mutex_lock(&phydev->lock); 1471 1472 value = phy_read(phydev, MII_BMCR); 1473 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN); 1474 1475 mutex_unlock(&phydev->lock); 1476 1477 return 0; 1478 } 1479 EXPORT_SYMBOL(genphy_suspend); 1480 1481 static int gen10g_suspend(struct phy_device *phydev) 1482 { 1483 return 0; 1484 } 1485 1486 int genphy_resume(struct phy_device *phydev) 1487 { 1488 int value; 1489 1490 mutex_lock(&phydev->lock); 1491 1492 value = phy_read(phydev, MII_BMCR); 1493 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN); 1494 1495 mutex_unlock(&phydev->lock); 1496 1497 return 0; 1498 } 1499 EXPORT_SYMBOL(genphy_resume); 1500 1501 static int gen10g_resume(struct phy_device *phydev) 1502 { 1503 return 0; 1504 } 1505 1506 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) 1507 { 1508 /* The default values for phydev->supported are provided by the PHY 1509 * driver "features" member, we want to reset to sane defaults first 1510 * before supporting higher speeds. 1511 */ 1512 phydev->supported &= PHY_DEFAULT_FEATURES; 1513 1514 switch (max_speed) { 1515 default: 1516 return -ENOTSUPP; 1517 case SPEED_1000: 1518 phydev->supported |= PHY_1000BT_FEATURES; 1519 /* fall through */ 1520 case SPEED_100: 1521 phydev->supported |= PHY_100BT_FEATURES; 1522 /* fall through */ 1523 case SPEED_10: 1524 phydev->supported |= PHY_10BT_FEATURES; 1525 } 1526 1527 return 0; 1528 } 1529 1530 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) 1531 { 1532 int err; 1533 1534 err = __set_phy_supported(phydev, max_speed); 1535 if (err) 1536 return err; 1537 1538 phydev->advertising = phydev->supported; 1539 1540 return 0; 1541 } 1542 EXPORT_SYMBOL(phy_set_max_speed); 1543 1544 static void of_set_phy_supported(struct phy_device *phydev) 1545 { 1546 struct device_node *node = phydev->mdio.dev.of_node; 1547 u32 max_speed; 1548 1549 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1550 return; 1551 1552 if (!node) 1553 return; 1554 1555 if (!of_property_read_u32(node, "max-speed", &max_speed)) 1556 __set_phy_supported(phydev, max_speed); 1557 } 1558 1559 /** 1560 * phy_probe - probe and init a PHY device 1561 * @dev: device to probe and init 1562 * 1563 * Description: Take care of setting up the phy_device structure, 1564 * set the state to READY (the driver's init function should 1565 * set it to STARTING if needed). 1566 */ 1567 static int phy_probe(struct device *dev) 1568 { 1569 struct phy_device *phydev = to_phy_device(dev); 1570 struct device_driver *drv = phydev->mdio.dev.driver; 1571 struct phy_driver *phydrv = to_phy_driver(drv); 1572 int err = 0; 1573 1574 phydev->drv = phydrv; 1575 1576 /* Disable the interrupt if the PHY doesn't support it 1577 * but the interrupt is still a valid one 1578 */ 1579 if (!(phydrv->flags & PHY_HAS_INTERRUPT) && 1580 phy_interrupt_is_valid(phydev)) 1581 phydev->irq = PHY_POLL; 1582 1583 if (phydrv->flags & PHY_IS_INTERNAL) 1584 phydev->is_internal = true; 1585 1586 mutex_lock(&phydev->lock); 1587 1588 /* Start out supporting everything. Eventually, 1589 * a controller will attach, and may modify one 1590 * or both of these values 1591 */ 1592 phydev->supported = phydrv->features; 1593 of_set_phy_supported(phydev); 1594 phydev->advertising = phydev->supported; 1595 1596 /* Set the state to READY by default */ 1597 phydev->state = PHY_READY; 1598 1599 if (phydev->drv->probe) 1600 err = phydev->drv->probe(phydev); 1601 1602 mutex_unlock(&phydev->lock); 1603 1604 return err; 1605 } 1606 1607 static int phy_remove(struct device *dev) 1608 { 1609 struct phy_device *phydev = to_phy_device(dev); 1610 1611 mutex_lock(&phydev->lock); 1612 phydev->state = PHY_DOWN; 1613 mutex_unlock(&phydev->lock); 1614 1615 if (phydev->drv->remove) 1616 phydev->drv->remove(phydev); 1617 phydev->drv = NULL; 1618 1619 return 0; 1620 } 1621 1622 /** 1623 * phy_driver_register - register a phy_driver with the PHY layer 1624 * @new_driver: new phy_driver to register 1625 * @owner: module owning this PHY 1626 */ 1627 int phy_driver_register(struct phy_driver *new_driver, struct module *owner) 1628 { 1629 int retval; 1630 1631 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; 1632 new_driver->mdiodrv.driver.name = new_driver->name; 1633 new_driver->mdiodrv.driver.bus = &mdio_bus_type; 1634 new_driver->mdiodrv.driver.probe = phy_probe; 1635 new_driver->mdiodrv.driver.remove = phy_remove; 1636 new_driver->mdiodrv.driver.owner = owner; 1637 1638 retval = driver_register(&new_driver->mdiodrv.driver); 1639 if (retval) { 1640 pr_err("%s: Error %d in registering driver\n", 1641 new_driver->name, retval); 1642 1643 return retval; 1644 } 1645 1646 pr_debug("%s: Registered new driver\n", new_driver->name); 1647 1648 return 0; 1649 } 1650 EXPORT_SYMBOL(phy_driver_register); 1651 1652 int phy_drivers_register(struct phy_driver *new_driver, int n, 1653 struct module *owner) 1654 { 1655 int i, ret = 0; 1656 1657 for (i = 0; i < n; i++) { 1658 ret = phy_driver_register(new_driver + i, owner); 1659 if (ret) { 1660 while (i-- > 0) 1661 phy_driver_unregister(new_driver + i); 1662 break; 1663 } 1664 } 1665 return ret; 1666 } 1667 EXPORT_SYMBOL(phy_drivers_register); 1668 1669 void phy_driver_unregister(struct phy_driver *drv) 1670 { 1671 driver_unregister(&drv->mdiodrv.driver); 1672 } 1673 EXPORT_SYMBOL(phy_driver_unregister); 1674 1675 void phy_drivers_unregister(struct phy_driver *drv, int n) 1676 { 1677 int i; 1678 1679 for (i = 0; i < n; i++) 1680 phy_driver_unregister(drv + i); 1681 } 1682 EXPORT_SYMBOL(phy_drivers_unregister); 1683 1684 static struct phy_driver genphy_driver[] = { 1685 { 1686 .phy_id = 0xffffffff, 1687 .phy_id_mask = 0xffffffff, 1688 .name = "Generic PHY", 1689 .soft_reset = genphy_soft_reset, 1690 .config_init = genphy_config_init, 1691 .features = PHY_GBIT_FEATURES | SUPPORTED_MII | 1692 SUPPORTED_AUI | SUPPORTED_FIBRE | 1693 SUPPORTED_BNC, 1694 .config_aneg = genphy_config_aneg, 1695 .aneg_done = genphy_aneg_done, 1696 .read_status = genphy_read_status, 1697 .suspend = genphy_suspend, 1698 .resume = genphy_resume, 1699 }, { 1700 .phy_id = 0xffffffff, 1701 .phy_id_mask = 0xffffffff, 1702 .name = "Generic 10G PHY", 1703 .soft_reset = gen10g_soft_reset, 1704 .config_init = gen10g_config_init, 1705 .features = 0, 1706 .config_aneg = gen10g_config_aneg, 1707 .read_status = gen10g_read_status, 1708 .suspend = gen10g_suspend, 1709 .resume = gen10g_resume, 1710 } }; 1711 1712 static int __init phy_init(void) 1713 { 1714 int rc; 1715 1716 rc = mdio_bus_init(); 1717 if (rc) 1718 return rc; 1719 1720 rc = phy_drivers_register(genphy_driver, 1721 ARRAY_SIZE(genphy_driver), THIS_MODULE); 1722 if (rc) 1723 mdio_bus_exit(); 1724 1725 return rc; 1726 } 1727 1728 static void __exit phy_exit(void) 1729 { 1730 phy_drivers_unregister(genphy_driver, 1731 ARRAY_SIZE(genphy_driver)); 1732 mdio_bus_exit(); 1733 } 1734 1735 subsys_initcall(phy_init); 1736 module_exit(phy_exit); 1737