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 int err; 912 913 /* For Ethernet device drivers that register their own MDIO bus, we 914 * will have bus->owner match ndev_mod, so we do not want to increment 915 * our own module->refcnt here, otherwise we would not be able to 916 * unload later on. 917 */ 918 if (ndev_owner != bus->owner && !try_module_get(bus->owner)) { 919 dev_err(&dev->dev, "failed to get the bus module\n"); 920 return -EIO; 921 } 922 923 get_device(d); 924 925 /* Assume that if there is no driver, that it doesn't 926 * exist, and we should use the genphy driver. 927 */ 928 if (!d->driver) { 929 if (phydev->is_c45) 930 d->driver = 931 &genphy_driver[GENPHY_DRV_10G].mdiodrv.driver; 932 else 933 d->driver = 934 &genphy_driver[GENPHY_DRV_1G].mdiodrv.driver; 935 936 err = d->driver->probe(d); 937 if (err >= 0) 938 err = device_bind_driver(d); 939 940 if (err) 941 goto error; 942 } 943 944 if (phydev->attached_dev) { 945 dev_err(&dev->dev, "PHY already attached\n"); 946 err = -EBUSY; 947 goto error; 948 } 949 950 phydev->attached_dev = dev; 951 dev->phydev = phydev; 952 953 phydev->dev_flags = flags; 954 955 phydev->interface = interface; 956 957 phydev->state = PHY_READY; 958 959 /* Initial carrier state is off as the phy is about to be 960 * (re)initialized. 961 */ 962 netif_carrier_off(phydev->attached_dev); 963 964 /* Do initial configuration here, now that 965 * we have certain key parameters 966 * (dev_flags and interface) 967 */ 968 err = phy_init_hw(phydev); 969 if (err) 970 goto error; 971 972 phy_resume(phydev); 973 phy_led_triggers_register(phydev); 974 975 return err; 976 977 error: 978 phy_detach(phydev); 979 put_device(d); 980 if (ndev_owner != bus->owner) 981 module_put(bus->owner); 982 return err; 983 } 984 EXPORT_SYMBOL(phy_attach_direct); 985 986 /** 987 * phy_attach - attach a network device to a particular PHY device 988 * @dev: network device to attach 989 * @bus_id: Bus ID of PHY device to attach 990 * @interface: PHY device's interface 991 * 992 * Description: Same as phy_attach_direct() except that a PHY bus_id 993 * string is passed instead of a pointer to a struct phy_device. 994 */ 995 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 996 phy_interface_t interface) 997 { 998 struct bus_type *bus = &mdio_bus_type; 999 struct phy_device *phydev; 1000 struct device *d; 1001 int rc; 1002 1003 /* Search the list of PHY devices on the mdio bus for the 1004 * PHY with the requested name 1005 */ 1006 d = bus_find_device_by_name(bus, NULL, bus_id); 1007 if (!d) { 1008 pr_err("PHY %s not found\n", bus_id); 1009 return ERR_PTR(-ENODEV); 1010 } 1011 phydev = to_phy_device(d); 1012 1013 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 1014 put_device(d); 1015 if (rc) 1016 return ERR_PTR(rc); 1017 1018 return phydev; 1019 } 1020 EXPORT_SYMBOL(phy_attach); 1021 1022 /** 1023 * phy_detach - detach a PHY device from its network device 1024 * @phydev: target phy_device struct 1025 * 1026 * This detaches the phy device from its network device and the phy 1027 * driver, and drops the reference count taken in phy_attach_direct(). 1028 */ 1029 void phy_detach(struct phy_device *phydev) 1030 { 1031 struct net_device *dev = phydev->attached_dev; 1032 struct module *ndev_owner = dev->dev.parent->driver->owner; 1033 struct mii_bus *bus; 1034 int i; 1035 1036 phydev->attached_dev->phydev = NULL; 1037 phydev->attached_dev = NULL; 1038 phy_suspend(phydev); 1039 1040 phy_led_triggers_unregister(phydev); 1041 1042 /* If the device had no specific driver before (i.e. - it 1043 * was using the generic driver), we unbind the device 1044 * from the generic driver so that there's a chance a 1045 * real driver could be loaded 1046 */ 1047 for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) { 1048 if (phydev->mdio.dev.driver == 1049 &genphy_driver[i].mdiodrv.driver) { 1050 device_release_driver(&phydev->mdio.dev); 1051 break; 1052 } 1053 } 1054 1055 /* 1056 * The phydev might go away on the put_device() below, so avoid 1057 * a use-after-free bug by reading the underlying bus first. 1058 */ 1059 bus = phydev->mdio.bus; 1060 1061 put_device(&phydev->mdio.dev); 1062 if (ndev_owner != bus->owner) 1063 module_put(bus->owner); 1064 } 1065 EXPORT_SYMBOL(phy_detach); 1066 1067 int phy_suspend(struct phy_device *phydev) 1068 { 1069 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1070 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 1071 int ret = 0; 1072 1073 /* If the device has WOL enabled, we cannot suspend the PHY */ 1074 phy_ethtool_get_wol(phydev, &wol); 1075 if (wol.wolopts) 1076 return -EBUSY; 1077 1078 if (phydrv->suspend) 1079 ret = phydrv->suspend(phydev); 1080 1081 if (ret) 1082 return ret; 1083 1084 phydev->suspended = true; 1085 1086 return ret; 1087 } 1088 EXPORT_SYMBOL(phy_suspend); 1089 1090 int phy_resume(struct phy_device *phydev) 1091 { 1092 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1093 int ret = 0; 1094 1095 if (phydrv->resume) 1096 ret = phydrv->resume(phydev); 1097 1098 if (ret) 1099 return ret; 1100 1101 phydev->suspended = false; 1102 1103 return ret; 1104 } 1105 EXPORT_SYMBOL(phy_resume); 1106 1107 /* Generic PHY support and helper functions */ 1108 1109 /** 1110 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 1111 * @phydev: target phy_device struct 1112 * 1113 * Description: Writes MII_ADVERTISE with the appropriate values, 1114 * after sanitizing the values to make sure we only advertise 1115 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1116 * hasn't changed, and > 0 if it has changed. 1117 */ 1118 static int genphy_config_advert(struct phy_device *phydev) 1119 { 1120 u32 advertise; 1121 int oldadv, adv, bmsr; 1122 int err, changed = 0; 1123 1124 /* Only allow advertising what this PHY supports */ 1125 phydev->advertising &= phydev->supported; 1126 advertise = phydev->advertising; 1127 1128 /* Setup standard advertisement */ 1129 adv = phy_read(phydev, MII_ADVERTISE); 1130 if (adv < 0) 1131 return adv; 1132 1133 oldadv = adv; 1134 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | 1135 ADVERTISE_PAUSE_ASYM); 1136 adv |= ethtool_adv_to_mii_adv_t(advertise); 1137 1138 if (adv != oldadv) { 1139 err = phy_write(phydev, MII_ADVERTISE, adv); 1140 1141 if (err < 0) 1142 return err; 1143 changed = 1; 1144 } 1145 1146 bmsr = phy_read(phydev, MII_BMSR); 1147 if (bmsr < 0) 1148 return bmsr; 1149 1150 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 1151 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 1152 * logical 1. 1153 */ 1154 if (!(bmsr & BMSR_ESTATEN)) 1155 return changed; 1156 1157 /* Configure gigabit if it's supported */ 1158 adv = phy_read(phydev, MII_CTRL1000); 1159 if (adv < 0) 1160 return adv; 1161 1162 oldadv = adv; 1163 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); 1164 1165 if (phydev->supported & (SUPPORTED_1000baseT_Half | 1166 SUPPORTED_1000baseT_Full)) { 1167 adv |= ethtool_adv_to_mii_ctrl1000_t(advertise); 1168 } 1169 1170 if (adv != oldadv) 1171 changed = 1; 1172 1173 err = phy_write(phydev, MII_CTRL1000, adv); 1174 if (err < 0) 1175 return err; 1176 1177 return changed; 1178 } 1179 1180 /** 1181 * genphy_config_eee_advert - disable unwanted eee mode advertisement 1182 * @phydev: target phy_device struct 1183 * 1184 * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy 1185 * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't 1186 * changed, and 1 if it has changed. 1187 */ 1188 static int genphy_config_eee_advert(struct phy_device *phydev) 1189 { 1190 u32 broken = phydev->eee_broken_modes; 1191 u32 old_adv, adv; 1192 1193 /* Nothing to disable */ 1194 if (!broken) 1195 return 0; 1196 1197 /* If the following call fails, we assume that EEE is not 1198 * supported by the phy. If we read 0, EEE is not advertised 1199 * In both case, we don't need to continue 1200 */ 1201 adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN); 1202 if (adv <= 0) 1203 return 0; 1204 1205 old_adv = adv; 1206 adv &= ~broken; 1207 1208 /* Advertising remains unchanged with the broken mask */ 1209 if (old_adv == adv) 1210 return 0; 1211 1212 phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN, adv); 1213 1214 return 1; 1215 } 1216 1217 /** 1218 * genphy_setup_forced - configures/forces speed/duplex from @phydev 1219 * @phydev: target phy_device struct 1220 * 1221 * Description: Configures MII_BMCR to force speed/duplex 1222 * to the values in phydev. Assumes that the values are valid. 1223 * Please see phy_sanitize_settings(). 1224 */ 1225 int genphy_setup_forced(struct phy_device *phydev) 1226 { 1227 int ctl = phy_read(phydev, MII_BMCR); 1228 1229 ctl &= BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN; 1230 phydev->pause = 0; 1231 phydev->asym_pause = 0; 1232 1233 if (SPEED_1000 == phydev->speed) 1234 ctl |= BMCR_SPEED1000; 1235 else if (SPEED_100 == phydev->speed) 1236 ctl |= BMCR_SPEED100; 1237 1238 if (DUPLEX_FULL == phydev->duplex) 1239 ctl |= BMCR_FULLDPLX; 1240 1241 return phy_write(phydev, MII_BMCR, ctl); 1242 } 1243 EXPORT_SYMBOL(genphy_setup_forced); 1244 1245 /** 1246 * genphy_restart_aneg - Enable and Restart Autonegotiation 1247 * @phydev: target phy_device struct 1248 */ 1249 int genphy_restart_aneg(struct phy_device *phydev) 1250 { 1251 int ctl = phy_read(phydev, MII_BMCR); 1252 1253 if (ctl < 0) 1254 return ctl; 1255 1256 ctl |= BMCR_ANENABLE | BMCR_ANRESTART; 1257 1258 /* Don't isolate the PHY if we're negotiating */ 1259 ctl &= ~BMCR_ISOLATE; 1260 1261 return phy_write(phydev, MII_BMCR, ctl); 1262 } 1263 EXPORT_SYMBOL(genphy_restart_aneg); 1264 1265 /** 1266 * genphy_config_aneg - restart auto-negotiation or write BMCR 1267 * @phydev: target phy_device struct 1268 * 1269 * Description: If auto-negotiation is enabled, we configure the 1270 * advertising, and then restart auto-negotiation. If it is not 1271 * enabled, then we write the BMCR. 1272 */ 1273 int genphy_config_aneg(struct phy_device *phydev) 1274 { 1275 int err, changed; 1276 1277 changed = genphy_config_eee_advert(phydev); 1278 1279 if (AUTONEG_ENABLE != phydev->autoneg) 1280 return genphy_setup_forced(phydev); 1281 1282 err = genphy_config_advert(phydev); 1283 if (err < 0) /* error */ 1284 return err; 1285 1286 changed |= err; 1287 1288 if (changed == 0) { 1289 /* Advertisement hasn't changed, but maybe aneg was never on to 1290 * begin with? Or maybe phy was isolated? 1291 */ 1292 int ctl = phy_read(phydev, MII_BMCR); 1293 1294 if (ctl < 0) 1295 return ctl; 1296 1297 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 1298 changed = 1; /* do restart aneg */ 1299 } 1300 1301 /* Only restart aneg if we are advertising something different 1302 * than we were before. 1303 */ 1304 if (changed > 0) 1305 return genphy_restart_aneg(phydev); 1306 1307 return 0; 1308 } 1309 EXPORT_SYMBOL(genphy_config_aneg); 1310 1311 /** 1312 * genphy_aneg_done - return auto-negotiation status 1313 * @phydev: target phy_device struct 1314 * 1315 * Description: Reads the status register and returns 0 either if 1316 * auto-negotiation is incomplete, or if there was an error. 1317 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 1318 */ 1319 int genphy_aneg_done(struct phy_device *phydev) 1320 { 1321 int retval = phy_read(phydev, MII_BMSR); 1322 1323 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 1324 } 1325 EXPORT_SYMBOL(genphy_aneg_done); 1326 1327 static int gen10g_config_aneg(struct phy_device *phydev) 1328 { 1329 return 0; 1330 } 1331 1332 /** 1333 * genphy_update_link - update link status in @phydev 1334 * @phydev: target phy_device struct 1335 * 1336 * Description: Update the value in phydev->link to reflect the 1337 * current link value. In order to do this, we need to read 1338 * the status register twice, keeping the second value. 1339 */ 1340 int genphy_update_link(struct phy_device *phydev) 1341 { 1342 int status; 1343 1344 /* Do a fake read */ 1345 status = phy_read(phydev, MII_BMSR); 1346 if (status < 0) 1347 return status; 1348 1349 /* Read link and autonegotiation status */ 1350 status = phy_read(phydev, MII_BMSR); 1351 if (status < 0) 1352 return status; 1353 1354 if ((status & BMSR_LSTATUS) == 0) 1355 phydev->link = 0; 1356 else 1357 phydev->link = 1; 1358 1359 return 0; 1360 } 1361 EXPORT_SYMBOL(genphy_update_link); 1362 1363 /** 1364 * genphy_read_status - check the link status and update current link state 1365 * @phydev: target phy_device struct 1366 * 1367 * Description: Check the link, then figure out the current state 1368 * by comparing what we advertise with what the link partner 1369 * advertises. Start by checking the gigabit possibilities, 1370 * then move on to 10/100. 1371 */ 1372 int genphy_read_status(struct phy_device *phydev) 1373 { 1374 int adv; 1375 int err; 1376 int lpa; 1377 int lpagb = 0; 1378 int common_adv; 1379 int common_adv_gb = 0; 1380 1381 /* Update the link, but return if there was an error */ 1382 err = genphy_update_link(phydev); 1383 if (err) 1384 return err; 1385 1386 phydev->lp_advertising = 0; 1387 1388 if (AUTONEG_ENABLE == phydev->autoneg) { 1389 if (phydev->supported & (SUPPORTED_1000baseT_Half 1390 | SUPPORTED_1000baseT_Full)) { 1391 lpagb = phy_read(phydev, MII_STAT1000); 1392 if (lpagb < 0) 1393 return lpagb; 1394 1395 adv = phy_read(phydev, MII_CTRL1000); 1396 if (adv < 0) 1397 return adv; 1398 1399 phydev->lp_advertising = 1400 mii_stat1000_to_ethtool_lpa_t(lpagb); 1401 common_adv_gb = lpagb & adv << 2; 1402 } 1403 1404 lpa = phy_read(phydev, MII_LPA); 1405 if (lpa < 0) 1406 return lpa; 1407 1408 phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa); 1409 1410 adv = phy_read(phydev, MII_ADVERTISE); 1411 if (adv < 0) 1412 return adv; 1413 1414 common_adv = lpa & adv; 1415 1416 phydev->speed = SPEED_10; 1417 phydev->duplex = DUPLEX_HALF; 1418 phydev->pause = 0; 1419 phydev->asym_pause = 0; 1420 1421 if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) { 1422 phydev->speed = SPEED_1000; 1423 1424 if (common_adv_gb & LPA_1000FULL) 1425 phydev->duplex = DUPLEX_FULL; 1426 } else if (common_adv & (LPA_100FULL | LPA_100HALF)) { 1427 phydev->speed = SPEED_100; 1428 1429 if (common_adv & LPA_100FULL) 1430 phydev->duplex = DUPLEX_FULL; 1431 } else 1432 if (common_adv & LPA_10FULL) 1433 phydev->duplex = DUPLEX_FULL; 1434 1435 if (phydev->duplex == DUPLEX_FULL) { 1436 phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0; 1437 phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0; 1438 } 1439 } else { 1440 int bmcr = phy_read(phydev, MII_BMCR); 1441 1442 if (bmcr < 0) 1443 return bmcr; 1444 1445 if (bmcr & BMCR_FULLDPLX) 1446 phydev->duplex = DUPLEX_FULL; 1447 else 1448 phydev->duplex = DUPLEX_HALF; 1449 1450 if (bmcr & BMCR_SPEED1000) 1451 phydev->speed = SPEED_1000; 1452 else if (bmcr & BMCR_SPEED100) 1453 phydev->speed = SPEED_100; 1454 else 1455 phydev->speed = SPEED_10; 1456 1457 phydev->pause = 0; 1458 phydev->asym_pause = 0; 1459 } 1460 1461 return 0; 1462 } 1463 EXPORT_SYMBOL(genphy_read_status); 1464 1465 static int gen10g_read_status(struct phy_device *phydev) 1466 { 1467 int devad, reg; 1468 u32 mmd_mask = phydev->c45_ids.devices_in_package; 1469 1470 phydev->link = 1; 1471 1472 /* For now just lie and say it's 10G all the time */ 1473 phydev->speed = SPEED_10000; 1474 phydev->duplex = DUPLEX_FULL; 1475 1476 for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) { 1477 if (!(mmd_mask & 1)) 1478 continue; 1479 1480 /* Read twice because link state is latched and a 1481 * read moves the current state into the register 1482 */ 1483 phy_read_mmd(phydev, devad, MDIO_STAT1); 1484 reg = phy_read_mmd(phydev, devad, MDIO_STAT1); 1485 if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS)) 1486 phydev->link = 0; 1487 } 1488 1489 return 0; 1490 } 1491 1492 /** 1493 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 1494 * @phydev: target phy_device struct 1495 * 1496 * Description: Perform a software PHY reset using the standard 1497 * BMCR_RESET bit and poll for the reset bit to be cleared. 1498 * 1499 * Returns: 0 on success, < 0 on failure 1500 */ 1501 int genphy_soft_reset(struct phy_device *phydev) 1502 { 1503 int ret; 1504 1505 ret = phy_write(phydev, MII_BMCR, BMCR_RESET); 1506 if (ret < 0) 1507 return ret; 1508 1509 return phy_poll_reset(phydev); 1510 } 1511 EXPORT_SYMBOL(genphy_soft_reset); 1512 1513 int genphy_config_init(struct phy_device *phydev) 1514 { 1515 int val; 1516 u32 features; 1517 1518 features = (SUPPORTED_TP | SUPPORTED_MII 1519 | SUPPORTED_AUI | SUPPORTED_FIBRE | 1520 SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1521 1522 /* Do we support autonegotiation? */ 1523 val = phy_read(phydev, MII_BMSR); 1524 if (val < 0) 1525 return val; 1526 1527 if (val & BMSR_ANEGCAPABLE) 1528 features |= SUPPORTED_Autoneg; 1529 1530 if (val & BMSR_100FULL) 1531 features |= SUPPORTED_100baseT_Full; 1532 if (val & BMSR_100HALF) 1533 features |= SUPPORTED_100baseT_Half; 1534 if (val & BMSR_10FULL) 1535 features |= SUPPORTED_10baseT_Full; 1536 if (val & BMSR_10HALF) 1537 features |= SUPPORTED_10baseT_Half; 1538 1539 if (val & BMSR_ESTATEN) { 1540 val = phy_read(phydev, MII_ESTATUS); 1541 if (val < 0) 1542 return val; 1543 1544 if (val & ESTATUS_1000_TFULL) 1545 features |= SUPPORTED_1000baseT_Full; 1546 if (val & ESTATUS_1000_THALF) 1547 features |= SUPPORTED_1000baseT_Half; 1548 } 1549 1550 phydev->supported &= features; 1551 phydev->advertising &= features; 1552 1553 return 0; 1554 } 1555 1556 static int gen10g_soft_reset(struct phy_device *phydev) 1557 { 1558 /* Do nothing for now */ 1559 return 0; 1560 } 1561 EXPORT_SYMBOL(genphy_config_init); 1562 1563 static int gen10g_config_init(struct phy_device *phydev) 1564 { 1565 /* Temporarily just say we support everything */ 1566 phydev->supported = SUPPORTED_10000baseT_Full; 1567 phydev->advertising = SUPPORTED_10000baseT_Full; 1568 1569 return 0; 1570 } 1571 1572 int genphy_suspend(struct phy_device *phydev) 1573 { 1574 int value; 1575 1576 mutex_lock(&phydev->lock); 1577 1578 value = phy_read(phydev, MII_BMCR); 1579 phy_write(phydev, MII_BMCR, value | BMCR_PDOWN); 1580 1581 mutex_unlock(&phydev->lock); 1582 1583 return 0; 1584 } 1585 EXPORT_SYMBOL(genphy_suspend); 1586 1587 static int gen10g_suspend(struct phy_device *phydev) 1588 { 1589 return 0; 1590 } 1591 1592 int genphy_resume(struct phy_device *phydev) 1593 { 1594 int value; 1595 1596 mutex_lock(&phydev->lock); 1597 1598 value = phy_read(phydev, MII_BMCR); 1599 phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN); 1600 1601 mutex_unlock(&phydev->lock); 1602 1603 return 0; 1604 } 1605 EXPORT_SYMBOL(genphy_resume); 1606 1607 static int gen10g_resume(struct phy_device *phydev) 1608 { 1609 return 0; 1610 } 1611 1612 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) 1613 { 1614 /* The default values for phydev->supported are provided by the PHY 1615 * driver "features" member, we want to reset to sane defaults first 1616 * before supporting higher speeds. 1617 */ 1618 phydev->supported &= PHY_DEFAULT_FEATURES; 1619 1620 switch (max_speed) { 1621 default: 1622 return -ENOTSUPP; 1623 case SPEED_1000: 1624 phydev->supported |= PHY_1000BT_FEATURES; 1625 /* fall through */ 1626 case SPEED_100: 1627 phydev->supported |= PHY_100BT_FEATURES; 1628 /* fall through */ 1629 case SPEED_10: 1630 phydev->supported |= PHY_10BT_FEATURES; 1631 } 1632 1633 return 0; 1634 } 1635 1636 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) 1637 { 1638 int err; 1639 1640 err = __set_phy_supported(phydev, max_speed); 1641 if (err) 1642 return err; 1643 1644 phydev->advertising = phydev->supported; 1645 1646 return 0; 1647 } 1648 EXPORT_SYMBOL(phy_set_max_speed); 1649 1650 static void of_set_phy_supported(struct phy_device *phydev) 1651 { 1652 struct device_node *node = phydev->mdio.dev.of_node; 1653 u32 max_speed; 1654 1655 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1656 return; 1657 1658 if (!node) 1659 return; 1660 1661 if (!of_property_read_u32(node, "max-speed", &max_speed)) 1662 __set_phy_supported(phydev, max_speed); 1663 } 1664 1665 static void of_set_phy_eee_broken(struct phy_device *phydev) 1666 { 1667 struct device_node *node = phydev->mdio.dev.of_node; 1668 u32 broken; 1669 1670 if (!IS_ENABLED(CONFIG_OF_MDIO)) 1671 return; 1672 1673 if (!node) 1674 return; 1675 1676 if (!of_property_read_u32(node, "eee-broken-modes", &broken)) 1677 phydev->eee_broken_modes = broken; 1678 } 1679 1680 /** 1681 * phy_probe - probe and init a PHY device 1682 * @dev: device to probe and init 1683 * 1684 * Description: Take care of setting up the phy_device structure, 1685 * set the state to READY (the driver's init function should 1686 * set it to STARTING if needed). 1687 */ 1688 static int phy_probe(struct device *dev) 1689 { 1690 struct phy_device *phydev = to_phy_device(dev); 1691 struct device_driver *drv = phydev->mdio.dev.driver; 1692 struct phy_driver *phydrv = to_phy_driver(drv); 1693 int err = 0; 1694 1695 phydev->drv = phydrv; 1696 1697 /* Disable the interrupt if the PHY doesn't support it 1698 * but the interrupt is still a valid one 1699 */ 1700 if (!(phydrv->flags & PHY_HAS_INTERRUPT) && 1701 phy_interrupt_is_valid(phydev)) 1702 phydev->irq = PHY_POLL; 1703 1704 if (phydrv->flags & PHY_IS_INTERNAL) 1705 phydev->is_internal = true; 1706 1707 mutex_lock(&phydev->lock); 1708 1709 /* Start out supporting everything. Eventually, 1710 * a controller will attach, and may modify one 1711 * or both of these values 1712 */ 1713 phydev->supported = phydrv->features; 1714 of_set_phy_supported(phydev); 1715 phydev->advertising = phydev->supported; 1716 1717 /* Get the EEE modes we want to prohibit. We will ask 1718 * the PHY stop advertising these mode later on 1719 */ 1720 of_set_phy_eee_broken(phydev); 1721 1722 /* The Pause Frame bits indicate that the PHY can support passing 1723 * pause frames. During autonegotiation, the PHYs will determine if 1724 * they should allow pause frames to pass. The MAC driver should then 1725 * use that result to determine whether to enable flow control via 1726 * pause frames. 1727 * 1728 * Normally, PHY drivers should not set the Pause bits, and instead 1729 * allow phylib to do that. However, there may be some situations 1730 * (e.g. hardware erratum) where the driver wants to set only one 1731 * of these bits. 1732 */ 1733 if (phydrv->features & (SUPPORTED_Pause | SUPPORTED_Asym_Pause)) { 1734 phydev->supported &= ~(SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1735 phydev->supported |= phydrv->features & 1736 (SUPPORTED_Pause | SUPPORTED_Asym_Pause); 1737 } else { 1738 phydev->supported |= SUPPORTED_Pause | SUPPORTED_Asym_Pause; 1739 } 1740 1741 /* Set the state to READY by default */ 1742 phydev->state = PHY_READY; 1743 1744 if (phydev->drv->probe) 1745 err = phydev->drv->probe(phydev); 1746 1747 mutex_unlock(&phydev->lock); 1748 1749 return err; 1750 } 1751 1752 static int phy_remove(struct device *dev) 1753 { 1754 struct phy_device *phydev = to_phy_device(dev); 1755 1756 mutex_lock(&phydev->lock); 1757 phydev->state = PHY_DOWN; 1758 mutex_unlock(&phydev->lock); 1759 1760 if (phydev->drv->remove) 1761 phydev->drv->remove(phydev); 1762 phydev->drv = NULL; 1763 1764 return 0; 1765 } 1766 1767 /** 1768 * phy_driver_register - register a phy_driver with the PHY layer 1769 * @new_driver: new phy_driver to register 1770 * @owner: module owning this PHY 1771 */ 1772 int phy_driver_register(struct phy_driver *new_driver, struct module *owner) 1773 { 1774 int retval; 1775 1776 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; 1777 new_driver->mdiodrv.driver.name = new_driver->name; 1778 new_driver->mdiodrv.driver.bus = &mdio_bus_type; 1779 new_driver->mdiodrv.driver.probe = phy_probe; 1780 new_driver->mdiodrv.driver.remove = phy_remove; 1781 new_driver->mdiodrv.driver.owner = owner; 1782 1783 retval = driver_register(&new_driver->mdiodrv.driver); 1784 if (retval) { 1785 pr_err("%s: Error %d in registering driver\n", 1786 new_driver->name, retval); 1787 1788 return retval; 1789 } 1790 1791 pr_debug("%s: Registered new driver\n", new_driver->name); 1792 1793 return 0; 1794 } 1795 EXPORT_SYMBOL(phy_driver_register); 1796 1797 int phy_drivers_register(struct phy_driver *new_driver, int n, 1798 struct module *owner) 1799 { 1800 int i, ret = 0; 1801 1802 for (i = 0; i < n; i++) { 1803 ret = phy_driver_register(new_driver + i, owner); 1804 if (ret) { 1805 while (i-- > 0) 1806 phy_driver_unregister(new_driver + i); 1807 break; 1808 } 1809 } 1810 return ret; 1811 } 1812 EXPORT_SYMBOL(phy_drivers_register); 1813 1814 void phy_driver_unregister(struct phy_driver *drv) 1815 { 1816 driver_unregister(&drv->mdiodrv.driver); 1817 } 1818 EXPORT_SYMBOL(phy_driver_unregister); 1819 1820 void phy_drivers_unregister(struct phy_driver *drv, int n) 1821 { 1822 int i; 1823 1824 for (i = 0; i < n; i++) 1825 phy_driver_unregister(drv + i); 1826 } 1827 EXPORT_SYMBOL(phy_drivers_unregister); 1828 1829 static struct phy_driver genphy_driver[] = { 1830 { 1831 .phy_id = 0xffffffff, 1832 .phy_id_mask = 0xffffffff, 1833 .name = "Generic PHY", 1834 .soft_reset = genphy_soft_reset, 1835 .config_init = genphy_config_init, 1836 .features = PHY_GBIT_FEATURES | SUPPORTED_MII | 1837 SUPPORTED_AUI | SUPPORTED_FIBRE | 1838 SUPPORTED_BNC, 1839 .config_aneg = genphy_config_aneg, 1840 .aneg_done = genphy_aneg_done, 1841 .read_status = genphy_read_status, 1842 .suspend = genphy_suspend, 1843 .resume = genphy_resume, 1844 }, { 1845 .phy_id = 0xffffffff, 1846 .phy_id_mask = 0xffffffff, 1847 .name = "Generic 10G PHY", 1848 .soft_reset = gen10g_soft_reset, 1849 .config_init = gen10g_config_init, 1850 .features = 0, 1851 .config_aneg = gen10g_config_aneg, 1852 .read_status = gen10g_read_status, 1853 .suspend = gen10g_suspend, 1854 .resume = gen10g_resume, 1855 } }; 1856 1857 static int __init phy_init(void) 1858 { 1859 int rc; 1860 1861 rc = mdio_bus_init(); 1862 if (rc) 1863 return rc; 1864 1865 rc = phy_drivers_register(genphy_driver, 1866 ARRAY_SIZE(genphy_driver), THIS_MODULE); 1867 if (rc) 1868 mdio_bus_exit(); 1869 1870 return rc; 1871 } 1872 1873 static void __exit phy_exit(void) 1874 { 1875 phy_drivers_unregister(genphy_driver, 1876 ARRAY_SIZE(genphy_driver)); 1877 mdio_bus_exit(); 1878 } 1879 1880 subsys_initcall(phy_init); 1881 module_exit(phy_exit); 1882