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/phy_led_triggers.h> 34 #include <linux/mdio.h> 35 #include <linux/io.h> 36 #include <linux/uaccess.h> 37 #include <linux/of.h> 38 39 #include <asm/irq.h> 40 41 MODULE_DESCRIPTION("PHY library"); 42 MODULE_AUTHOR("Andy Fleming"); 43 MODULE_LICENSE("GPL"); 44 45 void phy_device_free(struct phy_device *phydev) 46 { 47 put_device(&phydev->mdio.dev); 48 } 49 EXPORT_SYMBOL(phy_device_free); 50 51 static void phy_mdio_device_free(struct mdio_device *mdiodev) 52 { 53 struct phy_device *phydev; 54 55 phydev = container_of(mdiodev, struct phy_device, mdio); 56 phy_device_free(phydev); 57 } 58 59 static void phy_device_release(struct device *dev) 60 { 61 kfree(to_phy_device(dev)); 62 } 63 64 static void phy_mdio_device_remove(struct mdio_device *mdiodev) 65 { 66 struct phy_device *phydev; 67 68 phydev = container_of(mdiodev, struct phy_device, mdio); 69 phy_device_remove(phydev); 70 } 71 72 enum genphy_driver { 73 GENPHY_DRV_1G, 74 GENPHY_DRV_10G, 75 GENPHY_DRV_MAX 76 }; 77 78 static struct phy_driver genphy_driver[GENPHY_DRV_MAX]; 79 80 static LIST_HEAD(phy_fixup_list); 81 static DEFINE_MUTEX(phy_fixup_lock); 82 83 #ifdef CONFIG_PM 84 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) 85 { 86 struct device_driver *drv = phydev->mdio.dev.driver; 87 struct phy_driver *phydrv = to_phy_driver(drv); 88 struct net_device *netdev = phydev->attached_dev; 89 90 if (!drv || !phydrv->suspend) 91 return false; 92 93 /* PHY not attached? May suspend if the PHY has not already been 94 * suspended as part of a prior call to phy_disconnect() -> 95 * phy_detach() -> phy_suspend() because the parent netdev might be the 96 * MDIO bus driver and clock gated at this point. 97 */ 98 if (!netdev) 99 return !phydev->suspended; 100 101 /* Don't suspend PHY if the attached netdev parent may wakeup. 102 * The parent may point to a PCI device, as in tg3 driver. 103 */ 104 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) 105 return false; 106 107 /* Also don't suspend PHY if the netdev itself may wakeup. This 108 * is the case for devices w/o underlaying pwr. mgmt. aware bus, 109 * e.g. SoC devices. 110 */ 111 if (device_may_wakeup(&netdev->dev)) 112 return false; 113 114 return true; 115 } 116 117 static int mdio_bus_phy_suspend(struct device *dev) 118 { 119 struct phy_device *phydev = to_phy_device(dev); 120 121 /* We must stop the state machine manually, otherwise it stops out of 122 * control, possibly with the phydev->lock held. Upon resume, netdev 123 * may call phy routines that try to grab the same lock, and that may 124 * lead to a deadlock. 125 */ 126 if (phydev->attached_dev && phydev->adjust_link) 127 phy_stop_machine(phydev); 128 129 if (!mdio_bus_phy_may_suspend(phydev)) 130 return 0; 131 132 return phy_suspend(phydev); 133 } 134 135 static int mdio_bus_phy_resume(struct device *dev) 136 { 137 struct phy_device *phydev = to_phy_device(dev); 138 int ret; 139 140 if (!mdio_bus_phy_may_suspend(phydev)) 141 goto no_resume; 142 143 ret = phy_resume(phydev); 144 if (ret < 0) 145 return ret; 146 147 no_resume: 148 if (phydev->attached_dev && phydev->adjust_link) 149 phy_start_machine(phydev); 150 151 return 0; 152 } 153 154 static int mdio_bus_phy_restore(struct device *dev) 155 { 156 struct phy_device *phydev = to_phy_device(dev); 157 struct net_device *netdev = phydev->attached_dev; 158 int ret; 159 160 if (!netdev) 161 return 0; 162 163 ret = phy_init_hw(phydev); 164 if (ret < 0) 165 return ret; 166 167 /* The PHY needs to renegotiate. */ 168 phydev->link = 0; 169 phydev->state = PHY_UP; 170 171 phy_start_machine(phydev); 172 173 return 0; 174 } 175 176 static const struct dev_pm_ops mdio_bus_phy_pm_ops = { 177 .suspend = mdio_bus_phy_suspend, 178 .resume = mdio_bus_phy_resume, 179 .freeze = mdio_bus_phy_suspend, 180 .thaw = mdio_bus_phy_resume, 181 .restore = mdio_bus_phy_restore, 182 }; 183 184 #define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops) 185 186 #else 187 188 #define MDIO_BUS_PHY_PM_OPS NULL 189 190 #endif /* CONFIG_PM */ 191 192 /** 193 * phy_register_fixup - creates a new phy_fixup and adds it to the list 194 * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID) 195 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) 196 * It can also be PHY_ANY_UID 197 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before 198 * comparison 199 * @run: The actual code to be run when a matching PHY is found 200 */ 201 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, 202 int (*run)(struct phy_device *)) 203 { 204 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); 205 206 if (!fixup) 207 return -ENOMEM; 208 209 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); 210 fixup->phy_uid = phy_uid; 211 fixup->phy_uid_mask = phy_uid_mask; 212 fixup->run = run; 213 214 mutex_lock(&phy_fixup_lock); 215 list_add_tail(&fixup->list, &phy_fixup_list); 216 mutex_unlock(&phy_fixup_lock); 217 218 return 0; 219 } 220 EXPORT_SYMBOL(phy_register_fixup); 221 222 /* Registers a fixup to be run on any PHY with the UID in phy_uid */ 223 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, 224 int (*run)(struct phy_device *)) 225 { 226 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); 227 } 228 EXPORT_SYMBOL(phy_register_fixup_for_uid); 229 230 /* Registers a fixup to be run on the PHY with id string bus_id */ 231 int phy_register_fixup_for_id(const char *bus_id, 232 int (*run)(struct phy_device *)) 233 { 234 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); 235 } 236 EXPORT_SYMBOL(phy_register_fixup_for_id); 237 238 /** 239 * phy_unregister_fixup - remove a phy_fixup from the list 240 * @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list 241 * @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list 242 * @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison 243 */ 244 int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask) 245 { 246 struct list_head *pos, *n; 247 struct phy_fixup *fixup; 248 int ret; 249 250 ret = -ENODEV; 251 252 mutex_lock(&phy_fixup_lock); 253 list_for_each_safe(pos, n, &phy_fixup_list) { 254 fixup = list_entry(pos, struct phy_fixup, list); 255 256 if ((!strcmp(fixup->bus_id, bus_id)) && 257 ((fixup->phy_uid & phy_uid_mask) == 258 (phy_uid & phy_uid_mask))) { 259 list_del(&fixup->list); 260 kfree(fixup); 261 ret = 0; 262 break; 263 } 264 } 265 mutex_unlock(&phy_fixup_lock); 266 267 return ret; 268 } 269 EXPORT_SYMBOL(phy_unregister_fixup); 270 271 /* Unregisters a fixup of any PHY with the UID in phy_uid */ 272 int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask) 273 { 274 return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask); 275 } 276 EXPORT_SYMBOL(phy_unregister_fixup_for_uid); 277 278 /* Unregisters a fixup of the PHY with id string bus_id */ 279 int phy_unregister_fixup_for_id(const char *bus_id) 280 { 281 return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff); 282 } 283 EXPORT_SYMBOL(phy_unregister_fixup_for_id); 284 285 /* Returns 1 if fixup matches phydev in bus_id and phy_uid. 286 * Fixups can be set to match any in one or more fields. 287 */ 288 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) 289 { 290 if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0) 291 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) 292 return 0; 293 294 if ((fixup->phy_uid & fixup->phy_uid_mask) != 295 (phydev->phy_id & fixup->phy_uid_mask)) 296 if (fixup->phy_uid != PHY_ANY_UID) 297 return 0; 298 299 return 1; 300 } 301 302 /* Runs any matching fixups for this phydev */ 303 static int phy_scan_fixups(struct phy_device *phydev) 304 { 305 struct phy_fixup *fixup; 306 307 mutex_lock(&phy_fixup_lock); 308 list_for_each_entry(fixup, &phy_fixup_list, list) { 309 if (phy_needs_fixup(phydev, fixup)) { 310 int err = fixup->run(phydev); 311 312 if (err < 0) { 313 mutex_unlock(&phy_fixup_lock); 314 return err; 315 } 316 phydev->has_fixups = true; 317 } 318 } 319 mutex_unlock(&phy_fixup_lock); 320 321 return 0; 322 } 323 324 static int phy_bus_match(struct device *dev, struct device_driver *drv) 325 { 326 struct phy_device *phydev = to_phy_device(dev); 327 struct phy_driver *phydrv = to_phy_driver(drv); 328 const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids); 329 int i; 330 331 if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)) 332 return 0; 333 334 if (phydrv->match_phy_device) 335 return phydrv->match_phy_device(phydev); 336 337 if (phydev->is_c45) { 338 for (i = 1; i < num_ids; i++) { 339 if (!(phydev->c45_ids.devices_in_package & (1 << i))) 340 continue; 341 342 if ((phydrv->phy_id & phydrv->phy_id_mask) == 343 (phydev->c45_ids.device_ids[i] & 344 phydrv->phy_id_mask)) 345 return 1; 346 } 347 return 0; 348 } else { 349 return (phydrv->phy_id & phydrv->phy_id_mask) == 350 (phydev->phy_id & phydrv->phy_id_mask); 351 } 352 } 353 354 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id, 355 bool is_c45, 356 struct phy_c45_device_ids *c45_ids) 357 { 358 struct phy_device *dev; 359 struct mdio_device *mdiodev; 360 361 /* We allocate the device, and initialize the default values */ 362 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 363 if (!dev) 364 return ERR_PTR(-ENOMEM); 365 366 mdiodev = &dev->mdio; 367 mdiodev->dev.release = phy_device_release; 368 mdiodev->dev.parent = &bus->dev; 369 mdiodev->dev.bus = &mdio_bus_type; 370 mdiodev->bus = bus; 371 mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS; 372 mdiodev->bus_match = phy_bus_match; 373 mdiodev->addr = addr; 374 mdiodev->flags = MDIO_DEVICE_FLAG_PHY; 375 mdiodev->device_free = phy_mdio_device_free; 376 mdiodev->device_remove = phy_mdio_device_remove; 377 378 dev->speed = 0; 379 dev->duplex = -1; 380 dev->pause = 0; 381 dev->asym_pause = 0; 382 dev->link = 1; 383 dev->interface = PHY_INTERFACE_MODE_GMII; 384 385 dev->autoneg = AUTONEG_ENABLE; 386 387 dev->is_c45 = is_c45; 388 dev->phy_id = phy_id; 389 if (c45_ids) 390 dev->c45_ids = *c45_ids; 391 dev->irq = bus->irq[addr]; 392 dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); 393 394 dev->state = PHY_DOWN; 395 396 mutex_init(&dev->lock); 397 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); 398 INIT_WORK(&dev->phy_queue, phy_change_work); 399 400 /* Request the appropriate module unconditionally; don't 401 * bother trying to do so only if it isn't already loaded, 402 * because that gets complicated. A hotplug event would have 403 * done an unconditional modprobe anyway. 404 * We don't do normal hotplug because it won't work for MDIO 405 * -- because it relies on the device staying around for long 406 * enough for the driver to get loaded. With MDIO, the NIC 407 * driver will get bored and give up as soon as it finds that 408 * there's no driver _already_ loaded. 409 */ 410 request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id)); 411 412 device_initialize(&mdiodev->dev); 413 414 return dev; 415 } 416 EXPORT_SYMBOL(phy_device_create); 417 418 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers. 419 * @bus: the target MII bus 420 * @addr: PHY address on the MII bus 421 * @dev_addr: MMD address in the PHY. 422 * @devices_in_package: where to store the devices in package information. 423 * 424 * Description: reads devices in package registers of a MMD at @dev_addr 425 * from PHY at @addr on @bus. 426 * 427 * Returns: 0 on success, -EIO on failure. 428 */ 429 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr, 430 u32 *devices_in_package) 431 { 432 int phy_reg, reg_addr; 433 434 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2; 435 phy_reg = mdiobus_read(bus, addr, reg_addr); 436 if (phy_reg < 0) 437 return -EIO; 438 *devices_in_package = (phy_reg & 0xffff) << 16; 439 440 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1; 441 phy_reg = mdiobus_read(bus, addr, reg_addr); 442 if (phy_reg < 0) 443 return -EIO; 444 *devices_in_package |= (phy_reg & 0xffff); 445 446 return 0; 447 } 448 449 /** 450 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs. 451 * @bus: the target MII bus 452 * @addr: PHY address on the MII bus 453 * @phy_id: where to store the ID retrieved. 454 * @c45_ids: where to store the c45 ID information. 455 * 456 * If the PHY devices-in-package appears to be valid, it and the 457 * corresponding identifiers are stored in @c45_ids, zero is stored 458 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns 459 * zero on success. 460 * 461 */ 462 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id, 463 struct phy_c45_device_ids *c45_ids) { 464 int phy_reg; 465 int i, reg_addr; 466 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 467 u32 *devs = &c45_ids->devices_in_package; 468 469 /* Find first non-zero Devices In package. Device zero is reserved 470 * for 802.3 c45 complied PHYs, so don't probe it at first. 471 */ 472 for (i = 1; i < num_ids && *devs == 0; i++) { 473 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs); 474 if (phy_reg < 0) 475 return -EIO; 476 477 if ((*devs & 0x1fffffff) == 0x1fffffff) { 478 /* If mostly Fs, there is no device there, 479 * then let's continue to probe more, as some 480 * 10G PHYs have zero Devices In package, 481 * e.g. Cortina CS4315/CS4340 PHY. 482 */ 483 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs); 484 if (phy_reg < 0) 485 return -EIO; 486 /* no device there, let's get out of here */ 487 if ((*devs & 0x1fffffff) == 0x1fffffff) { 488 *phy_id = 0xffffffff; 489 return 0; 490 } else { 491 break; 492 } 493 } 494 } 495 496 /* Now probe Device Identifiers for each device present. */ 497 for (i = 1; i < num_ids; i++) { 498 if (!(c45_ids->devices_in_package & (1 << i))) 499 continue; 500 501 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1; 502 phy_reg = mdiobus_read(bus, addr, reg_addr); 503 if (phy_reg < 0) 504 return -EIO; 505 c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16; 506 507 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2; 508 phy_reg = mdiobus_read(bus, addr, reg_addr); 509 if (phy_reg < 0) 510 return -EIO; 511 c45_ids->device_ids[i] |= (phy_reg & 0xffff); 512 } 513 *phy_id = 0; 514 return 0; 515 } 516 517 /** 518 * get_phy_id - reads the specified addr for its ID. 519 * @bus: the target MII bus 520 * @addr: PHY address on the MII bus 521 * @phy_id: where to store the ID retrieved. 522 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 523 * @c45_ids: where to store the c45 ID information. 524 * 525 * Description: In the case of a 802.3-c22 PHY, reads the ID registers 526 * of the PHY at @addr on the @bus, stores it in @phy_id and returns 527 * zero on success. 528 * 529 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and 530 * its return value is in turn returned. 531 * 532 */ 533 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id, 534 bool is_c45, struct phy_c45_device_ids *c45_ids) 535 { 536 int phy_reg; 537 538 if (is_c45) 539 return get_phy_c45_ids(bus, addr, phy_id, c45_ids); 540 541 /* Grab the bits from PHYIR1, and put them in the upper half */ 542 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1); 543 if (phy_reg < 0) 544 return -EIO; 545 546 *phy_id = (phy_reg & 0xffff) << 16; 547 548 /* Grab the bits from PHYIR2, and put them in the lower half */ 549 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2); 550 if (phy_reg < 0) 551 return -EIO; 552 553 *phy_id |= (phy_reg & 0xffff); 554 555 return 0; 556 } 557 558 /** 559 * get_phy_device - reads the specified PHY device and returns its @phy_device 560 * struct 561 * @bus: the target MII bus 562 * @addr: PHY address on the MII bus 563 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 564 * 565 * Description: Reads the ID registers of the PHY at @addr on the 566 * @bus, then allocates and returns the phy_device to represent it. 567 */ 568 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45) 569 { 570 struct phy_c45_device_ids c45_ids = {0}; 571 u32 phy_id = 0; 572 int r; 573 574 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids); 575 if (r) 576 return ERR_PTR(r); 577 578 /* If the phy_id is mostly Fs, there is no device there */ 579 if ((phy_id & 0x1fffffff) == 0x1fffffff) 580 return ERR_PTR(-ENODEV); 581 582 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids); 583 } 584 EXPORT_SYMBOL(get_phy_device); 585 586 static ssize_t 587 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf) 588 { 589 struct phy_device *phydev = to_phy_device(dev); 590 591 return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id); 592 } 593 static DEVICE_ATTR_RO(phy_id); 594 595 static ssize_t 596 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf) 597 { 598 struct phy_device *phydev = to_phy_device(dev); 599 const char *mode = NULL; 600 601 if (phy_is_internal(phydev)) 602 mode = "internal"; 603 else 604 mode = phy_modes(phydev->interface); 605 606 return sprintf(buf, "%s\n", mode); 607 } 608 static DEVICE_ATTR_RO(phy_interface); 609 610 static ssize_t 611 phy_has_fixups_show(struct device *dev, struct device_attribute *attr, 612 char *buf) 613 { 614 struct phy_device *phydev = to_phy_device(dev); 615 616 return sprintf(buf, "%d\n", phydev->has_fixups); 617 } 618 static DEVICE_ATTR_RO(phy_has_fixups); 619 620 static struct attribute *phy_dev_attrs[] = { 621 &dev_attr_phy_id.attr, 622 &dev_attr_phy_interface.attr, 623 &dev_attr_phy_has_fixups.attr, 624 NULL, 625 }; 626 ATTRIBUTE_GROUPS(phy_dev); 627 628 /** 629 * phy_device_register - Register the phy device on the MDIO bus 630 * @phydev: phy_device structure to be added to the MDIO bus 631 */ 632 int phy_device_register(struct phy_device *phydev) 633 { 634 int err; 635 636 err = mdiobus_register_device(&phydev->mdio); 637 if (err) 638 return err; 639 640 /* Run all of the fixups for this PHY */ 641 err = phy_scan_fixups(phydev); 642 if (err) { 643 pr_err("PHY %d failed to initialize\n", phydev->mdio.addr); 644 goto out; 645 } 646 647 phydev->mdio.dev.groups = phy_dev_groups; 648 649 err = device_add(&phydev->mdio.dev); 650 if (err) { 651 pr_err("PHY %d failed to add\n", phydev->mdio.addr); 652 goto out; 653 } 654 655 return 0; 656 657 out: 658 mdiobus_unregister_device(&phydev->mdio); 659 return err; 660 } 661 EXPORT_SYMBOL(phy_device_register); 662 663 /** 664 * phy_device_remove - Remove a previously registered phy device from the MDIO bus 665 * @phydev: phy_device structure to remove 666 * 667 * This doesn't free the phy_device itself, it merely reverses the effects 668 * of phy_device_register(). Use phy_device_free() to free the device 669 * after calling this function. 670 */ 671 void phy_device_remove(struct phy_device *phydev) 672 { 673 device_del(&phydev->mdio.dev); 674 mdiobus_unregister_device(&phydev->mdio); 675 } 676 EXPORT_SYMBOL(phy_device_remove); 677 678 /** 679 * phy_find_first - finds the first PHY device on the bus 680 * @bus: the target MII bus 681 */ 682 struct phy_device *phy_find_first(struct mii_bus *bus) 683 { 684 struct phy_device *phydev; 685 int addr; 686 687 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 688 phydev = mdiobus_get_phy(bus, addr); 689 if (phydev) 690 return phydev; 691 } 692 return NULL; 693 } 694 EXPORT_SYMBOL(phy_find_first); 695 696 /** 697 * phy_prepare_link - prepares the PHY layer to monitor link status 698 * @phydev: target phy_device struct 699 * @handler: callback function for link status change notifications 700 * 701 * Description: Tells the PHY infrastructure to handle the 702 * gory details on monitoring link status (whether through 703 * polling or an interrupt), and to call back to the 704 * connected device driver when the link status changes. 705 * If you want to monitor your own link state, don't call 706 * this function. 707 */ 708 static void phy_prepare_link(struct phy_device *phydev, 709 void (*handler)(struct net_device *)) 710 { 711 phydev->adjust_link = handler; 712 } 713 714 /** 715 * phy_connect_direct - connect an ethernet device to a specific phy_device 716 * @dev: the network device to connect 717 * @phydev: the pointer to the phy device 718 * @handler: callback function for state change notifications 719 * @interface: PHY device's interface 720 */ 721 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev, 722 void (*handler)(struct net_device *), 723 phy_interface_t interface) 724 { 725 int rc; 726 727 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 728 if (rc) 729 return rc; 730 731 phy_prepare_link(phydev, handler); 732 phy_start_machine(phydev); 733 if (phydev->irq > 0) 734 phy_start_interrupts(phydev); 735 736 return 0; 737 } 738 EXPORT_SYMBOL(phy_connect_direct); 739 740 /** 741 * phy_connect - connect an ethernet device to a PHY device 742 * @dev: the network device to connect 743 * @bus_id: the id string of the PHY device to connect 744 * @handler: callback function for state change notifications 745 * @interface: PHY device's interface 746 * 747 * Description: Convenience function for connecting ethernet 748 * devices to PHY devices. The default behavior is for 749 * the PHY infrastructure to handle everything, and only notify 750 * the connected driver when the link status changes. If you 751 * don't want, or can't use the provided functionality, you may 752 * choose to call only the subset of functions which provide 753 * the desired functionality. 754 */ 755 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id, 756 void (*handler)(struct net_device *), 757 phy_interface_t interface) 758 { 759 struct phy_device *phydev; 760 struct device *d; 761 int rc; 762 763 /* Search the list of PHY devices on the mdio bus for the 764 * PHY with the requested name 765 */ 766 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id); 767 if (!d) { 768 pr_err("PHY %s not found\n", bus_id); 769 return ERR_PTR(-ENODEV); 770 } 771 phydev = to_phy_device(d); 772 773 rc = phy_connect_direct(dev, phydev, handler, interface); 774 put_device(d); 775 if (rc) 776 return ERR_PTR(rc); 777 778 return phydev; 779 } 780 EXPORT_SYMBOL(phy_connect); 781 782 /** 783 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY 784 * device 785 * @phydev: target phy_device struct 786 */ 787 void phy_disconnect(struct phy_device *phydev) 788 { 789 if (phydev->irq > 0) 790 phy_stop_interrupts(phydev); 791 792 phy_stop_machine(phydev); 793 794 phydev->adjust_link = NULL; 795 796 phy_detach(phydev); 797 } 798 EXPORT_SYMBOL(phy_disconnect); 799 800 /** 801 * phy_poll_reset - Safely wait until a PHY reset has properly completed 802 * @phydev: The PHY device to poll 803 * 804 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as 805 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR 806 * register must be polled until the BMCR_RESET bit clears. 807 * 808 * Furthermore, any attempts to write to PHY registers may have no effect 809 * or even generate MDIO bus errors until this is complete. 810 * 811 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the 812 * standard and do not fully reset after the BMCR_RESET bit is set, and may 813 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an 814 * effort to support such broken PHYs, this function is separate from the 815 * standard phy_init_hw() which will zero all the other bits in the BMCR 816 * and reapply all driver-specific and board-specific fixups. 817 */ 818 static int phy_poll_reset(struct phy_device *phydev) 819 { 820 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ 821 unsigned int retries = 12; 822 int ret; 823 824 do { 825 msleep(50); 826 ret = phy_read(phydev, MII_BMCR); 827 if (ret < 0) 828 return ret; 829 } while (ret & BMCR_RESET && --retries); 830 if (ret & BMCR_RESET) 831 return -ETIMEDOUT; 832 833 /* Some chips (smsc911x) may still need up to another 1ms after the 834 * BMCR_RESET bit is cleared before they are usable. 835 */ 836 msleep(1); 837 return 0; 838 } 839 840 int phy_init_hw(struct phy_device *phydev) 841 { 842 int ret = 0; 843 844 if (!phydev->drv || !phydev->drv->config_init) 845 return 0; 846 847 if (phydev->drv->soft_reset) 848 ret = phydev->drv->soft_reset(phydev); 849 else 850 ret = genphy_soft_reset(phydev); 851 852 if (ret < 0) 853 return ret; 854 855 ret = phy_scan_fixups(phydev); 856 if (ret < 0) 857 return ret; 858 859 return phydev->drv->config_init(phydev); 860 } 861 EXPORT_SYMBOL(phy_init_hw); 862 863 void phy_attached_info(struct phy_device *phydev) 864 { 865 phy_attached_print(phydev, NULL); 866 } 867 EXPORT_SYMBOL(phy_attached_info); 868 869 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)" 870 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...) 871 { 872 if (!fmt) { 873 dev_info(&phydev->mdio.dev, ATTACHED_FMT "\n", 874 phydev->drv->name, phydev_name(phydev), 875 phydev->irq); 876 } else { 877 va_list ap; 878 879 dev_info(&phydev->mdio.dev, ATTACHED_FMT, 880 phydev->drv->name, phydev_name(phydev), 881 phydev->irq); 882 883 va_start(ap, fmt); 884 vprintk(fmt, ap); 885 va_end(ap); 886 } 887 } 888 EXPORT_SYMBOL(phy_attached_print); 889 890 /** 891 * phy_attach_direct - attach a network device to a given PHY device pointer 892 * @dev: network device to attach 893 * @phydev: Pointer to phy_device to attach 894 * @flags: PHY device's dev_flags 895 * @interface: PHY device's interface 896 * 897 * Description: Called by drivers to attach to a particular PHY 898 * device. The phy_device is found, and properly hooked up 899 * to the phy_driver. If no driver is attached, then a 900 * generic driver is used. The phy_device is given a ptr to 901 * the attaching device, and given a callback for link status 902 * change. The phy_device is returned to the attaching driver. 903 * This function takes a reference on the phy device. 904 */ 905 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 906 u32 flags, phy_interface_t interface) 907 { 908 struct module *ndev_owner = dev->dev.parent->driver->owner; 909 struct mii_bus *bus = phydev->mdio.bus; 910 struct device *d = &phydev->mdio.dev; 911 bool using_genphy = false; 912 int err; 913 914 /* For Ethernet device drivers that register their own MDIO bus, we 915 * will have bus->owner match ndev_mod, so we do not want to increment 916 * our own module->refcnt here, otherwise we would not be able to 917 * unload later on. 918 */ 919 if (ndev_owner != bus->owner && !try_module_get(bus->owner)) { 920 dev_err(&dev->dev, "failed to get the bus module\n"); 921 return -EIO; 922 } 923 924 get_device(d); 925 926 /* Assume that if there is no driver, that it doesn't 927 * exist, and we should use the genphy driver. 928 */ 929 if (!d->driver) { 930 if (phydev->is_c45) 931 d->driver = 932 &genphy_driver[GENPHY_DRV_10G].mdiodrv.driver; 933 else 934 d->driver = 935 &genphy_driver[GENPHY_DRV_1G].mdiodrv.driver; 936 937 using_genphy = true; 938 } 939 940 if (!try_module_get(d->driver->owner)) { 941 dev_err(&dev->dev, "failed to get the device driver module\n"); 942 err = -EIO; 943 goto error_put_device; 944 } 945 946 if (using_genphy) { 947 err = d->driver->probe(d); 948 if (err >= 0) 949 err = device_bind_driver(d); 950 951 if (err) 952 goto error_module_put; 953 } 954 955 if (phydev->attached_dev) { 956 dev_err(&dev->dev, "PHY already attached\n"); 957 err = -EBUSY; 958 goto error; 959 } 960 961 phydev->attached_dev = dev; 962 dev->phydev = phydev; 963 964 phydev->dev_flags = flags; 965 966 phydev->interface = interface; 967 968 phydev->state = PHY_READY; 969 970 /* Initial carrier state is off as the phy is about to be 971 * (re)initialized. 972 */ 973 netif_carrier_off(phydev->attached_dev); 974 975 /* Do initial configuration here, now that 976 * we have certain key parameters 977 * (dev_flags and interface) 978 */ 979 err = phy_init_hw(phydev); 980 if (err) 981 goto error; 982 983 phy_resume(phydev); 984 phy_led_triggers_register(phydev); 985 986 return err; 987 988 error: 989 /* phy_detach() does all of the cleanup below */ 990 phy_detach(phydev); 991 return err; 992 993 error_module_put: 994 module_put(d->driver->owner); 995 error_put_device: 996 put_device(d); 997 if (ndev_owner != bus->owner) 998 module_put(bus->owner); 999 return err; 1000 } 1001 EXPORT_SYMBOL(phy_attach_direct); 1002 1003 /** 1004 * phy_attach - attach a network device to a particular PHY device 1005 * @dev: network device to attach 1006 * @bus_id: Bus ID of PHY device to attach 1007 * @interface: PHY device's interface 1008 * 1009 * Description: Same as phy_attach_direct() except that a PHY bus_id 1010 * string is passed instead of a pointer to a struct phy_device. 1011 */ 1012 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 1013 phy_interface_t interface) 1014 { 1015 struct bus_type *bus = &mdio_bus_type; 1016 struct phy_device *phydev; 1017 struct device *d; 1018 int rc; 1019 1020 /* Search the list of PHY devices on the mdio bus for the 1021 * PHY with the requested name 1022 */ 1023 d = bus_find_device_by_name(bus, NULL, bus_id); 1024 if (!d) { 1025 pr_err("PHY %s not found\n", bus_id); 1026 return ERR_PTR(-ENODEV); 1027 } 1028 phydev = to_phy_device(d); 1029 1030 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 1031 put_device(d); 1032 if (rc) 1033 return ERR_PTR(rc); 1034 1035 return phydev; 1036 } 1037 EXPORT_SYMBOL(phy_attach); 1038 1039 /** 1040 * phy_detach - detach a PHY device from its network device 1041 * @phydev: target phy_device struct 1042 * 1043 * This detaches the phy device from its network device and the phy 1044 * driver, and drops the reference count taken in phy_attach_direct(). 1045 */ 1046 void phy_detach(struct phy_device *phydev) 1047 { 1048 struct net_device *dev = phydev->attached_dev; 1049 struct module *ndev_owner = dev->dev.parent->driver->owner; 1050 struct mii_bus *bus; 1051 int i; 1052 1053 phydev->attached_dev->phydev = NULL; 1054 phydev->attached_dev = NULL; 1055 phy_suspend(phydev); 1056 1057 phy_led_triggers_unregister(phydev); 1058 1059 module_put(phydev->mdio.dev.driver->owner); 1060 1061 /* If the device had no specific driver before (i.e. - it 1062 * was using the generic driver), we unbind the device 1063 * from the generic driver so that there's a chance a 1064 * real driver could be loaded 1065 */ 1066 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) { 1067 if (phydev->mdio.dev.driver == 1068 &genphy_driver[i].mdiodrv.driver) { 1069 device_release_driver(&phydev->mdio.dev); 1070 break; 1071 } 1072 } 1073 1074 /* 1075 * The phydev might go away on the put_device() below, so avoid 1076 * a use-after-free bug by reading the underlying bus first. 1077 */ 1078 bus = phydev->mdio.bus; 1079 1080 put_device(&phydev->mdio.dev); 1081 if (ndev_owner != bus->owner) 1082 module_put(bus->owner); 1083 } 1084 EXPORT_SYMBOL(phy_detach); 1085 1086 int phy_suspend(struct phy_device *phydev) 1087 { 1088 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1089 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 1090 int ret = 0; 1091 1092 /* If the device has WOL enabled, we cannot suspend the PHY */ 1093 phy_ethtool_get_wol(phydev, &wol); 1094 if (wol.wolopts) 1095 return -EBUSY; 1096 1097 if (phydev->drv && phydrv->suspend) 1098 ret = phydrv->suspend(phydev); 1099 1100 if (ret) 1101 return ret; 1102 1103 phydev->suspended = true; 1104 1105 return ret; 1106 } 1107 EXPORT_SYMBOL(phy_suspend); 1108 1109 int phy_resume(struct phy_device *phydev) 1110 { 1111 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1112 int ret = 0; 1113 1114 if (phydev->drv && phydrv->resume) 1115 ret = phydrv->resume(phydev); 1116 1117 if (ret) 1118 return ret; 1119 1120 phydev->suspended = false; 1121 1122 return ret; 1123 } 1124 EXPORT_SYMBOL(phy_resume); 1125 1126 /* Generic PHY support and helper functions */ 1127 1128 /** 1129 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 1130 * @phydev: target phy_device struct 1131 * 1132 * Description: Writes MII_ADVERTISE with the appropriate values, 1133 * after sanitizing the values to make sure we only advertise 1134 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1135 * hasn't changed, and > 0 if it has changed. 1136 */ 1137 static int genphy_config_advert(struct phy_device *phydev) 1138 { 1139 u32 advertise; 1140 int oldadv, adv, bmsr; 1141 int err, changed = 0; 1142 1143 /* Only allow advertising what this PHY supports */ 1144 phydev->advertising &= phydev->supported; 1145 advertise = phydev->advertising; 1146 1147 /* Setup standard advertisement */ 1148 adv = phy_read(phydev, MII_ADVERTISE); 1149 if (adv < 0) 1150 return adv; 1151 1152 oldadv = adv; 1153 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | 1154 ADVERTISE_PAUSE_ASYM); 1155 adv |= ethtool_adv_to_mii_adv_t(advertise); 1156 1157 if (adv != oldadv) { 1158 err = phy_write(phydev, MII_ADVERTISE, adv); 1159 1160 if (err < 0) 1161 return err; 1162 changed = 1; 1163 } 1164 1165 bmsr = phy_read(phydev, MII_BMSR); 1166 if (bmsr < 0) 1167 return bmsr; 1168 1169 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 1170 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 1171 * logical 1. 1172 */ 1173 if (!(bmsr & BMSR_ESTATEN)) 1174 return changed; 1175 1176 /* Configure gigabit if it's supported */ 1177 adv = phy_read(phydev, MII_CTRL1000); 1178 if (adv < 0) 1179 return adv; 1180 1181 oldadv = adv; 1182 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); 1183 1184 if (phydev->supported & (SUPPORTED_1000baseT_Half | 1185 SUPPORTED_1000baseT_Full)) { 1186 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise); 1187 } 1188 1189 if (adv != oldadv) 1190 changed = 1; 1191 1192 err = phy_write(phydev, MII_CTRL1000, adv); 1193 if (err < 0) 1194 return err; 1195 1196 return changed; 1197 } 1198 1199 /** 1200 * genphy_config_eee_advert - disable unwanted eee mode advertisement 1201 * @phydev: target phy_device struct 1202 * 1203 * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy 1204 * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't 1205 * changed, and 1 if it has changed. 1206 */ 1207 static int genphy_config_eee_advert(struct phy_device *phydev) 1208 { 1209 int broken = phydev->eee_broken_modes; 1210 int old_adv, adv; 1211 1212 /* Nothing to disable */ 1213 if (!broken) 1214 return 0; 1215 1216 /* If the following call fails, we assume that EEE is not 1217 * supported by the phy. If we read 0, EEE is not advertised 1218 * In both case, we don't need to continue 1219 */ 1220 adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN); 1221 if (adv <= 0) 1222 return 0; 1223 1224 old_adv = adv; 1225 adv &= ~broken; 1226 1227 /* Advertising remains unchanged with the broken mask */ 1228 if (old_adv == adv) 1229 return 0; 1230 1231 phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, adv); 1232 1233 return 1; 1234 } 1235 1236 /** 1237 * genphy_setup_forced - configures/forces speed/duplex from @phydev 1238 * @phydev: target phy_device struct 1239 * 1240 * Description: Configures MII_BMCR to force speed/duplex 1241 * to the values in phydev. Assumes that the values are valid. 1242 * Please see phy_sanitize_settings(). 1243 */ 1244 int genphy_setup_forced(struct phy_device *phydev) 1245 { 1246 int ctl = phy_read(phydev, MII_BMCR); 1247 1248 ctl &= BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN; 1249 phydev->pause = 0; 1250 phydev->asym_pause = 0; 1251 1252 if (SPEED_1000 == phydev->speed) 1253 ctl |= BMCR_SPEED1000; 1254 else if (SPEED_100 == phydev->speed) 1255 ctl |= BMCR_SPEED100; 1256 1257 if (DUPLEX_FULL == phydev->duplex) 1258 ctl |= BMCR_FULLDPLX; 1259 1260 return phy_write(phydev, MII_BMCR, ctl); 1261 } 1262 EXPORT_SYMBOL(genphy_setup_forced); 1263 1264 /** 1265 * genphy_restart_aneg - Enable and Restart Autonegotiation 1266 * @phydev: target phy_device struct 1267 */ 1268 int genphy_restart_aneg(struct phy_device *phydev) 1269 { 1270 int ctl = phy_read(phydev, MII_BMCR); 1271 1272 if (ctl < 0) 1273 return ctl; 1274 1275 ctl |= BMCR_ANENABLE | BMCR_ANRESTART; 1276 1277 /* Don't isolate the PHY if we're negotiating */ 1278 ctl &= ~BMCR_ISOLATE; 1279 1280 return phy_write(phydev, MII_BMCR, ctl); 1281 } 1282 EXPORT_SYMBOL(genphy_restart_aneg); 1283 1284 /** 1285 * genphy_config_aneg - restart auto-negotiation or write BMCR 1286 * @phydev: target phy_device struct 1287 * 1288 * Description: If auto-negotiation is enabled, we configure the 1289 * advertising, and then restart auto-negotiation. If it is not 1290 * enabled, then we write the BMCR. 1291 */ 1292 int genphy_config_aneg(struct phy_device *phydev) 1293 { 1294 int err, changed; 1295 1296 changed = genphy_config_eee_advert(phydev); 1297 1298 if (AUTONEG_ENABLE != phydev->autoneg) 1299 return genphy_setup_forced(phydev); 1300 1301 err = genphy_config_advert(phydev); 1302 if (err < 0) /* error */ 1303 return err; 1304 1305 changed |= err; 1306 1307 if (changed == 0) { 1308 /* Advertisement hasn't changed, but maybe aneg was never on to 1309 * begin with? Or maybe phy was isolated? 1310 */ 1311 int ctl = phy_read(phydev, MII_BMCR); 1312 1313 if (ctl < 0) 1314 return ctl; 1315 1316 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 1317 changed = 1; /* do restart aneg */ 1318 } 1319 1320 /* Only restart aneg if we are advertising something different 1321 * than we were before. 1322 */ 1323 if (changed > 0) 1324 return genphy_restart_aneg(phydev); 1325 1326 return 0; 1327 } 1328 EXPORT_SYMBOL(genphy_config_aneg); 1329 1330 /** 1331 * genphy_aneg_done - return auto-negotiation status 1332 * @phydev: target phy_device struct 1333 * 1334 * Description: Reads the status register and returns 0 either if 1335 * auto-negotiation is incomplete, or if there was an error. 1336 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 1337 */ 1338 int genphy_aneg_done(struct phy_device *phydev) 1339 { 1340 int retval = phy_read(phydev, MII_BMSR); 1341 1342 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 1343 } 1344 EXPORT_SYMBOL(genphy_aneg_done); 1345 1346 static int gen10g_config_aneg(struct phy_device *phydev) 1347 { 1348 return 0; 1349 } 1350 1351 /** 1352 * genphy_update_link - update link status in @phydev 1353 * @phydev: target phy_device struct 1354 * 1355 * Description: Update the value in phydev->link to reflect the 1356 * current link value. In order to do this, we need to read 1357 * the status register twice, keeping the second value. 1358 */ 1359 int genphy_update_link(struct phy_device *phydev) 1360 { 1361 int status; 1362 1363 /* Do a fake read */ 1364 status = phy_read(phydev, MII_BMSR); 1365 if (status < 0) 1366 return status; 1367 1368 /* Read link and autonegotiation status */ 1369 status = phy_read(phydev, MII_BMSR); 1370 if (status < 0) 1371 return status; 1372 1373 if ((status & BMSR_LSTATUS) == 0) 1374 phydev->link = 0; 1375 else 1376 phydev->link = 1; 1377 1378 return 0; 1379 } 1380 EXPORT_SYMBOL(genphy_update_link); 1381 1382 /** 1383 * genphy_read_status - check the link status and update current link state 1384 * @phydev: target phy_device struct 1385 * 1386 * Description: Check the link, then figure out the current state 1387 * by comparing what we advertise with what the link partner 1388 * advertises. Start by checking the gigabit possibilities, 1389 * then move on to 10/100. 1390 */ 1391 int genphy_read_status(struct phy_device *phydev) 1392 { 1393 int adv; 1394 int err; 1395 int lpa; 1396 int lpagb = 0; 1397 int common_adv; 1398 int common_adv_gb = 0; 1399 1400 /* Update the link, but return if there was an error */ 1401 err = genphy_update_link(phydev); 1402 if (err) 1403 return err; 1404 1405 phydev->lp_advertising = 0; 1406 1407 if (AUTONEG_ENABLE == phydev->autoneg) { 1408 if (phydev->supported & (SUPPORTED_1000baseT_Half 1409 | SUPPORTED_1000baseT_Full)) { 1410 lpagb = phy_read(phydev, MII_STAT1000); 1411 if (lpagb < 0) 1412 return lpagb; 1413 1414 adv = phy_read(phydev, MII_CTRL1000); 1415 if (adv < 0) 1416 return adv; 1417 1418 phydev->lp_advertising = 1419 mii_stat1000_to_ethtool_lpa_t(lpagb); 1420 common_adv_gb = lpagb & adv << 2; 1421 } 1422 1423 lpa = phy_read(phydev, MII_LPA); 1424 if (lpa < 0) 1425 return lpa; 1426 1427 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa); 1428 1429 adv = phy_read(phydev, MII_ADVERTISE); 1430 if (adv < 0) 1431 return adv; 1432 1433 common_adv = lpa & adv; 1434 1435 phydev->speed = SPEED_10; 1436 phydev->duplex = DUPLEX_HALF; 1437 phydev->pause = 0; 1438 phydev->asym_pause = 0; 1439 1440 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) { 1441 phydev->speed = SPEED_1000; 1442 1443 if (common_adv_gb & LPA_1000FULL) 1444 phydev->duplex = DUPLEX_FULL; 1445 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) { 1446 phydev->speed = SPEED_100; 1447 1448 if (common_adv & LPA_100FULL) 1449 phydev->duplex = DUPLEX_FULL; 1450 } else 1451 if (common_adv & LPA_10FULL) 1452 phydev->duplex = DUPLEX_FULL; 1453 1454 if (phydev->duplex == DUPLEX_FULL) { 1455 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0; 1456 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0; 1457 } 1458 } else { 1459 int bmcr = phy_read(phydev, MII_BMCR); 1460 1461 if (bmcr < 0) 1462 return bmcr; 1463 1464 if (bmcr & BMCR_FULLDPLX) 1465 phydev->duplex = DUPLEX_FULL; 1466 else 1467 phydev->duplex = DUPLEX_HALF; 1468 1469 if (bmcr & BMCR_SPEED1000) 1470 phydev->speed = SPEED_1000; 1471 else if (bmcr & BMCR_SPEED100) 1472 phydev->speed = SPEED_100; 1473 else 1474 phydev->speed = SPEED_10; 1475 1476 phydev->pause = 0; 1477 phydev->asym_pause = 0; 1478 } 1479 1480 return 0; 1481 } 1482 EXPORT_SYMBOL(genphy_read_status); 1483 1484 static int gen10g_read_status(struct phy_device *phydev) 1485 { 1486 int devad, reg; 1487 u32 mmd_mask = phydev->c45_ids.devices_in_package; 1488 1489 phydev->link = 1; 1490 1491 /* For now just lie and say it's 10G all the time */ 1492 phydev->speed = SPEED_10000; 1493 phydev->duplex = DUPLEX_FULL; 1494 1495 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) { 1496 if (!(mmd_mask & 1)) 1497 continue; 1498 1499 /* Read twice because link state is latched and a 1500 * read moves the current state into the register 1501 */ 1502 phy_read_mmd(phydev, devad, MDIO_STAT1); 1503 reg = phy_read_mmd(phydev, devad, MDIO_STAT1); 1504 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS)) 1505 phydev->link = 0; 1506 } 1507 1508 return 0; 1509 } 1510 1511 /** 1512 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 1513 * @phydev: target phy_device struct 1514 * 1515 * Description: Perform a software PHY reset using the standard 1516 * BMCR_RESET bit and poll for the reset bit to be cleared. 1517 * 1518 * Returns: 0 on success, < 0 on failure 1519 */ 1520 int genphy_soft_reset(struct phy_device *phydev) 1521 { 1522 int ret; 1523 1524 ret = phy_write(phydev, MII_BMCR, BMCR_RESET); 1525 if (ret < 0) 1526 return ret; 1527 1528 return phy_poll_reset(phydev); 1529 } 1530 EXPORT_SYMBOL(genphy_soft_reset); 1531 1532 int genphy_config_init(struct phy_device *phydev) 1533 { 1534 int val; 1535 u32 features; 1536 1537 features = (SUPPORTED_TP | SUPPORTED_MII 1538 | SUPPORTED_AUI | SUPPORTED_FIBRE | 1539 SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1540 1541 /* Do we support autonegotiation? */ 1542 val = phy_read(phydev, MII_BMSR); 1543 if (val < 0) 1544 return val; 1545 1546 if (val & BMSR_ANEGCAPABLE) 1547 features |= SUPPORTED_Autoneg; 1548 1549 if (val & BMSR_100FULL) 1550 features |= SUPPORTED_100baseT_Full; 1551 if (val & BMSR_100HALF) 1552 features |= SUPPORTED_100baseT_Half; 1553 if (val & BMSR_10FULL) 1554 features |= SUPPORTED_10baseT_Full; 1555 if (val & BMSR_10HALF) 1556 features |= SUPPORTED_10baseT_Half; 1557 1558 if (val & BMSR_ESTATEN) { 1559 val = phy_read(phydev, MII_ESTATUS); 1560 if (val < 0) 1561 return val; 1562 1563 if (val & ESTATUS_1000_TFULL) 1564 features |= SUPPORTED_1000baseT_Full; 1565 if (val & ESTATUS_1000_THALF) 1566 features |= SUPPORTED_1000baseT_Half; 1567 } 1568 1569 phydev->supported &= features; 1570 phydev->advertising &= features; 1571 1572 return 0; 1573 } 1574 1575 static int gen10g_soft_reset(struct phy_device *phydev) 1576 { 1577 /* Do nothing for now */ 1578 return 0; 1579 } 1580 EXPORT_SYMBOL(genphy_config_init); 1581 1582 static int gen10g_config_init(struct phy_device *phydev) 1583 { 1584 /* Temporarily just say we support everything */ 1585 phydev->supported = SUPPORTED_10000baseT_Full; 1586 phydev->advertising = SUPPORTED_10000baseT_Full; 1587 1588 return 0; 1589 } 1590 1591 int genphy_suspend(struct phy_device *phydev) 1592 { 1593 int value; 1594 1595 mutex_lock(&phydev->lock); 1596 1597 value = phy_read(phydev, MII_BMCR); 1598 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN); 1599 1600 mutex_unlock(&phydev->lock); 1601 1602 return 0; 1603 } 1604 EXPORT_SYMBOL(genphy_suspend); 1605 1606 static int gen10g_suspend(struct phy_device *phydev) 1607 { 1608 return 0; 1609 } 1610 1611 int genphy_resume(struct phy_device *phydev) 1612 { 1613 int value; 1614 1615 mutex_lock(&phydev->lock); 1616 1617 value = phy_read(phydev, MII_BMCR); 1618 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN); 1619 1620 mutex_unlock(&phydev->lock); 1621 1622 return 0; 1623 } 1624 EXPORT_SYMBOL(genphy_resume); 1625 1626 static int gen10g_resume(struct phy_device *phydev) 1627 { 1628 return 0; 1629 } 1630 1631 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) 1632 { 1633 /* The default values for phydev->supported are provided by the PHY 1634 * driver "features" member, we want to reset to sane defaults first 1635 * before supporting higher speeds. 1636 */ 1637 phydev->supported &= PHY_DEFAULT_FEATURES; 1638 1639 switch (max_speed) { 1640 default: 1641 return -ENOTSUPP; 1642 case SPEED_1000: 1643 phydev->supported |= PHY_1000BT_FEATURES; 1644 /* fall through */ 1645 case SPEED_100: 1646 phydev->supported |= PHY_100BT_FEATURES; 1647 /* fall through */ 1648 case SPEED_10: 1649 phydev->supported |= PHY_10BT_FEATURES; 1650 } 1651 1652 return 0; 1653 } 1654 1655 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) 1656 { 1657 int err; 1658 1659 err = __set_phy_supported(phydev, max_speed); 1660 if (err) 1661 return err; 1662 1663 phydev->advertising = phydev->supported; 1664 1665 return 0; 1666 } 1667 EXPORT_SYMBOL(phy_set_max_speed); 1668 1669 static void of_set_phy_supported(struct phy_device *phydev) 1670 { 1671 struct device_node *node = phydev->mdio.dev.of_node; 1672 u32 max_speed; 1673 1674 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1675 return; 1676 1677 if (!node) 1678 return; 1679 1680 if (!of_property_read_u32(node, "max-speed", &max_speed)) 1681 __set_phy_supported(phydev, max_speed); 1682 } 1683 1684 static void of_set_phy_eee_broken(struct phy_device *phydev) 1685 { 1686 struct device_node *node = phydev->mdio.dev.of_node; 1687 u32 broken = 0; 1688 1689 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1690 return; 1691 1692 if (!node) 1693 return; 1694 1695 if (of_property_read_bool(node, "eee-broken-100tx")) 1696 broken |= MDIO_EEE_100TX; 1697 if (of_property_read_bool(node, "eee-broken-1000t")) 1698 broken |= MDIO_EEE_1000T; 1699 if (of_property_read_bool(node, "eee-broken-10gt")) 1700 broken |= MDIO_EEE_10GT; 1701 if (of_property_read_bool(node, "eee-broken-1000kx")) 1702 broken |= MDIO_EEE_1000KX; 1703 if (of_property_read_bool(node, "eee-broken-10gkx4")) 1704 broken |= MDIO_EEE_10GKX4; 1705 if (of_property_read_bool(node, "eee-broken-10gkr")) 1706 broken |= MDIO_EEE_10GKR; 1707 1708 phydev->eee_broken_modes = broken; 1709 } 1710 1711 /** 1712 * phy_probe - probe and init a PHY device 1713 * @dev: device to probe and init 1714 * 1715 * Description: Take care of setting up the phy_device structure, 1716 * set the state to READY (the driver's init function should 1717 * set it to STARTING if needed). 1718 */ 1719 static int phy_probe(struct device *dev) 1720 { 1721 struct phy_device *phydev = to_phy_device(dev); 1722 struct device_driver *drv = phydev->mdio.dev.driver; 1723 struct phy_driver *phydrv = to_phy_driver(drv); 1724 int err = 0; 1725 1726 phydev->drv = phydrv; 1727 1728 /* Disable the interrupt if the PHY doesn't support it 1729 * but the interrupt is still a valid one 1730 */ 1731 if (!(phydrv->flags & PHY_HAS_INTERRUPT) && 1732 phy_interrupt_is_valid(phydev)) 1733 phydev->irq = PHY_POLL; 1734 1735 if (phydrv->flags & PHY_IS_INTERNAL) 1736 phydev->is_internal = true; 1737 1738 mutex_lock(&phydev->lock); 1739 1740 /* Start out supporting everything. Eventually, 1741 * a controller will attach, and may modify one 1742 * or both of these values 1743 */ 1744 phydev->supported = phydrv->features; 1745 of_set_phy_supported(phydev); 1746 phydev->advertising = phydev->supported; 1747 1748 /* Get the EEE modes we want to prohibit. We will ask 1749 * the PHY stop advertising these mode later on 1750 */ 1751 of_set_phy_eee_broken(phydev); 1752 1753 /* The Pause Frame bits indicate that the PHY can support passing 1754 * pause frames. During autonegotiation, the PHYs will determine if 1755 * they should allow pause frames to pass. The MAC driver should then 1756 * use that result to determine whether to enable flow control via 1757 * pause frames. 1758 * 1759 * Normally, PHY drivers should not set the Pause bits, and instead 1760 * allow phylib to do that. However, there may be some situations 1761 * (e.g. hardware erratum) where the driver wants to set only one 1762 * of these bits. 1763 */ 1764 if (phydrv->features & (SUPPORTED_Pause | SUPPORTED_Asym_Pause)) { 1765 phydev->supported &= ~(SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1766 phydev->supported |= phydrv->features & 1767 (SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1768 } else { 1769 phydev->supported |= SUPPORTED_Pause | SUPPORTED_Asym_Pause; 1770 } 1771 1772 /* Set the state to READY by default */ 1773 phydev->state = PHY_READY; 1774 1775 if (phydev->drv->probe) 1776 err = phydev->drv->probe(phydev); 1777 1778 mutex_unlock(&phydev->lock); 1779 1780 return err; 1781 } 1782 1783 static int phy_remove(struct device *dev) 1784 { 1785 struct phy_device *phydev = to_phy_device(dev); 1786 1787 cancel_delayed_work_sync(&phydev->state_queue); 1788 1789 mutex_lock(&phydev->lock); 1790 phydev->state = PHY_DOWN; 1791 mutex_unlock(&phydev->lock); 1792 1793 if (phydev->drv && phydev->drv->remove) 1794 phydev->drv->remove(phydev); 1795 phydev->drv = NULL; 1796 1797 return 0; 1798 } 1799 1800 /** 1801 * phy_driver_register - register a phy_driver with the PHY layer 1802 * @new_driver: new phy_driver to register 1803 * @owner: module owning this PHY 1804 */ 1805 int phy_driver_register(struct phy_driver *new_driver, struct module *owner) 1806 { 1807 int retval; 1808 1809 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; 1810 new_driver->mdiodrv.driver.name = new_driver->name; 1811 new_driver->mdiodrv.driver.bus = &mdio_bus_type; 1812 new_driver->mdiodrv.driver.probe = phy_probe; 1813 new_driver->mdiodrv.driver.remove = phy_remove; 1814 new_driver->mdiodrv.driver.owner = owner; 1815 1816 retval = driver_register(&new_driver->mdiodrv.driver); 1817 if (retval) { 1818 pr_err("%s: Error %d in registering driver\n", 1819 new_driver->name, retval); 1820 1821 return retval; 1822 } 1823 1824 pr_debug("%s: Registered new driver\n", new_driver->name); 1825 1826 return 0; 1827 } 1828 EXPORT_SYMBOL(phy_driver_register); 1829 1830 int phy_drivers_register(struct phy_driver *new_driver, int n, 1831 struct module *owner) 1832 { 1833 int i, ret = 0; 1834 1835 for (i = 0; i < n; i++) { 1836 ret = phy_driver_register(new_driver + i, owner); 1837 if (ret) { 1838 while (i-- > 0) 1839 phy_driver_unregister(new_driver + i); 1840 break; 1841 } 1842 } 1843 return ret; 1844 } 1845 EXPORT_SYMBOL(phy_drivers_register); 1846 1847 void phy_driver_unregister(struct phy_driver *drv) 1848 { 1849 driver_unregister(&drv->mdiodrv.driver); 1850 } 1851 EXPORT_SYMBOL(phy_driver_unregister); 1852 1853 void phy_drivers_unregister(struct phy_driver *drv, int n) 1854 { 1855 int i; 1856 1857 for (i = 0; i < n; i++) 1858 phy_driver_unregister(drv + i); 1859 } 1860 EXPORT_SYMBOL(phy_drivers_unregister); 1861 1862 static struct phy_driver genphy_driver[] = { 1863 { 1864 .phy_id = 0xffffffff, 1865 .phy_id_mask = 0xffffffff, 1866 .name = "Generic PHY", 1867 .soft_reset = genphy_no_soft_reset, 1868 .config_init = genphy_config_init, 1869 .features = PHY_GBIT_FEATURES | SUPPORTED_MII | 1870 SUPPORTED_AUI | SUPPORTED_FIBRE | 1871 SUPPORTED_BNC, 1872 .config_aneg = genphy_config_aneg, 1873 .aneg_done = genphy_aneg_done, 1874 .read_status = genphy_read_status, 1875 .suspend = genphy_suspend, 1876 .resume = genphy_resume, 1877 }, { 1878 .phy_id = 0xffffffff, 1879 .phy_id_mask = 0xffffffff, 1880 .name = "Generic 10G PHY", 1881 .soft_reset = gen10g_soft_reset, 1882 .config_init = gen10g_config_init, 1883 .features = 0, 1884 .config_aneg = gen10g_config_aneg, 1885 .read_status = gen10g_read_status, 1886 .suspend = gen10g_suspend, 1887 .resume = gen10g_resume, 1888 } }; 1889 1890 static int __init phy_init(void) 1891 { 1892 int rc; 1893 1894 rc = mdio_bus_init(); 1895 if (rc) 1896 return rc; 1897 1898 rc = phy_drivers_register(genphy_driver, 1899 ARRAY_SIZE(genphy_driver), THIS_MODULE); 1900 if (rc) 1901 mdio_bus_exit(); 1902 1903 return rc; 1904 } 1905 1906 static void __exit phy_exit(void) 1907 { 1908 phy_drivers_unregister(genphy_driver, 1909 ARRAY_SIZE(genphy_driver)); 1910 mdio_bus_exit(); 1911 } 1912 1913 subsys_initcall(phy_init); 1914 module_exit(phy_exit); 1915