1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Framework for finding and configuring PHYs. 3 * Also contains generic PHY driver 4 * 5 * Author: Andy Fleming 6 * 7 * Copyright (c) 2004 Freescale Semiconductor, Inc. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/string.h> 14 #include <linux/errno.h> 15 #include <linux/unistd.h> 16 #include <linux/slab.h> 17 #include <linux/interrupt.h> 18 #include <linux/init.h> 19 #include <linux/delay.h> 20 #include <linux/netdevice.h> 21 #include <linux/etherdevice.h> 22 #include <linux/skbuff.h> 23 #include <linux/mm.h> 24 #include <linux/module.h> 25 #include <linux/mii.h> 26 #include <linux/ethtool.h> 27 #include <linux/bitmap.h> 28 #include <linux/phy.h> 29 #include <linux/phy_led_triggers.h> 30 #include <linux/sfp.h> 31 #include <linux/mdio.h> 32 #include <linux/io.h> 33 #include <linux/uaccess.h> 34 35 MODULE_DESCRIPTION("PHY library"); 36 MODULE_AUTHOR("Andy Fleming"); 37 MODULE_LICENSE("GPL"); 38 39 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_features) __ro_after_init; 40 EXPORT_SYMBOL_GPL(phy_basic_features); 41 42 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_t1_features) __ro_after_init; 43 EXPORT_SYMBOL_GPL(phy_basic_t1_features); 44 45 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_features) __ro_after_init; 46 EXPORT_SYMBOL_GPL(phy_gbit_features); 47 48 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_fibre_features) __ro_after_init; 49 EXPORT_SYMBOL_GPL(phy_gbit_fibre_features); 50 51 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_all_ports_features) __ro_after_init; 52 EXPORT_SYMBOL_GPL(phy_gbit_all_ports_features); 53 54 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_features) __ro_after_init; 55 EXPORT_SYMBOL_GPL(phy_10gbit_features); 56 57 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_fec_features) __ro_after_init; 58 EXPORT_SYMBOL_GPL(phy_10gbit_fec_features); 59 60 const int phy_basic_ports_array[3] = { 61 ETHTOOL_LINK_MODE_Autoneg_BIT, 62 ETHTOOL_LINK_MODE_TP_BIT, 63 ETHTOOL_LINK_MODE_MII_BIT, 64 }; 65 EXPORT_SYMBOL_GPL(phy_basic_ports_array); 66 67 const int phy_fibre_port_array[1] = { 68 ETHTOOL_LINK_MODE_FIBRE_BIT, 69 }; 70 EXPORT_SYMBOL_GPL(phy_fibre_port_array); 71 72 const int phy_all_ports_features_array[7] = { 73 ETHTOOL_LINK_MODE_Autoneg_BIT, 74 ETHTOOL_LINK_MODE_TP_BIT, 75 ETHTOOL_LINK_MODE_MII_BIT, 76 ETHTOOL_LINK_MODE_FIBRE_BIT, 77 ETHTOOL_LINK_MODE_AUI_BIT, 78 ETHTOOL_LINK_MODE_BNC_BIT, 79 ETHTOOL_LINK_MODE_Backplane_BIT, 80 }; 81 EXPORT_SYMBOL_GPL(phy_all_ports_features_array); 82 83 const int phy_10_100_features_array[4] = { 84 ETHTOOL_LINK_MODE_10baseT_Half_BIT, 85 ETHTOOL_LINK_MODE_10baseT_Full_BIT, 86 ETHTOOL_LINK_MODE_100baseT_Half_BIT, 87 ETHTOOL_LINK_MODE_100baseT_Full_BIT, 88 }; 89 EXPORT_SYMBOL_GPL(phy_10_100_features_array); 90 91 const int phy_basic_t1_features_array[2] = { 92 ETHTOOL_LINK_MODE_TP_BIT, 93 ETHTOOL_LINK_MODE_100baseT1_Full_BIT, 94 }; 95 EXPORT_SYMBOL_GPL(phy_basic_t1_features_array); 96 97 const int phy_gbit_features_array[2] = { 98 ETHTOOL_LINK_MODE_1000baseT_Half_BIT, 99 ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 100 }; 101 EXPORT_SYMBOL_GPL(phy_gbit_features_array); 102 103 const int phy_10gbit_features_array[1] = { 104 ETHTOOL_LINK_MODE_10000baseT_Full_BIT, 105 }; 106 EXPORT_SYMBOL_GPL(phy_10gbit_features_array); 107 108 const int phy_10gbit_fec_features_array[1] = { 109 ETHTOOL_LINK_MODE_10000baseR_FEC_BIT, 110 }; 111 EXPORT_SYMBOL_GPL(phy_10gbit_fec_features_array); 112 113 __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_full_features) __ro_after_init; 114 EXPORT_SYMBOL_GPL(phy_10gbit_full_features); 115 116 static const int phy_10gbit_full_features_array[] = { 117 ETHTOOL_LINK_MODE_10baseT_Full_BIT, 118 ETHTOOL_LINK_MODE_100baseT_Full_BIT, 119 ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 120 ETHTOOL_LINK_MODE_10000baseT_Full_BIT, 121 }; 122 123 static void features_init(void) 124 { 125 /* 10/100 half/full*/ 126 linkmode_set_bit_array(phy_basic_ports_array, 127 ARRAY_SIZE(phy_basic_ports_array), 128 phy_basic_features); 129 linkmode_set_bit_array(phy_10_100_features_array, 130 ARRAY_SIZE(phy_10_100_features_array), 131 phy_basic_features); 132 133 /* 100 full, TP */ 134 linkmode_set_bit_array(phy_basic_t1_features_array, 135 ARRAY_SIZE(phy_basic_t1_features_array), 136 phy_basic_t1_features); 137 138 /* 10/100 half/full + 1000 half/full */ 139 linkmode_set_bit_array(phy_basic_ports_array, 140 ARRAY_SIZE(phy_basic_ports_array), 141 phy_gbit_features); 142 linkmode_set_bit_array(phy_10_100_features_array, 143 ARRAY_SIZE(phy_10_100_features_array), 144 phy_gbit_features); 145 linkmode_set_bit_array(phy_gbit_features_array, 146 ARRAY_SIZE(phy_gbit_features_array), 147 phy_gbit_features); 148 149 /* 10/100 half/full + 1000 half/full + fibre*/ 150 linkmode_set_bit_array(phy_basic_ports_array, 151 ARRAY_SIZE(phy_basic_ports_array), 152 phy_gbit_fibre_features); 153 linkmode_set_bit_array(phy_10_100_features_array, 154 ARRAY_SIZE(phy_10_100_features_array), 155 phy_gbit_fibre_features); 156 linkmode_set_bit_array(phy_gbit_features_array, 157 ARRAY_SIZE(phy_gbit_features_array), 158 phy_gbit_fibre_features); 159 linkmode_set_bit_array(phy_fibre_port_array, 160 ARRAY_SIZE(phy_fibre_port_array), 161 phy_gbit_fibre_features); 162 163 /* 10/100 half/full + 1000 half/full + TP/MII/FIBRE/AUI/BNC/Backplane*/ 164 linkmode_set_bit_array(phy_all_ports_features_array, 165 ARRAY_SIZE(phy_all_ports_features_array), 166 phy_gbit_all_ports_features); 167 linkmode_set_bit_array(phy_10_100_features_array, 168 ARRAY_SIZE(phy_10_100_features_array), 169 phy_gbit_all_ports_features); 170 linkmode_set_bit_array(phy_gbit_features_array, 171 ARRAY_SIZE(phy_gbit_features_array), 172 phy_gbit_all_ports_features); 173 174 /* 10/100 half/full + 1000 half/full + 10G full*/ 175 linkmode_set_bit_array(phy_all_ports_features_array, 176 ARRAY_SIZE(phy_all_ports_features_array), 177 phy_10gbit_features); 178 linkmode_set_bit_array(phy_10_100_features_array, 179 ARRAY_SIZE(phy_10_100_features_array), 180 phy_10gbit_features); 181 linkmode_set_bit_array(phy_gbit_features_array, 182 ARRAY_SIZE(phy_gbit_features_array), 183 phy_10gbit_features); 184 linkmode_set_bit_array(phy_10gbit_features_array, 185 ARRAY_SIZE(phy_10gbit_features_array), 186 phy_10gbit_features); 187 188 /* 10/100/1000/10G full */ 189 linkmode_set_bit_array(phy_all_ports_features_array, 190 ARRAY_SIZE(phy_all_ports_features_array), 191 phy_10gbit_full_features); 192 linkmode_set_bit_array(phy_10gbit_full_features_array, 193 ARRAY_SIZE(phy_10gbit_full_features_array), 194 phy_10gbit_full_features); 195 /* 10G FEC only */ 196 linkmode_set_bit_array(phy_10gbit_fec_features_array, 197 ARRAY_SIZE(phy_10gbit_fec_features_array), 198 phy_10gbit_fec_features); 199 } 200 201 void phy_device_free(struct phy_device *phydev) 202 { 203 put_device(&phydev->mdio.dev); 204 } 205 EXPORT_SYMBOL(phy_device_free); 206 207 static void phy_mdio_device_free(struct mdio_device *mdiodev) 208 { 209 struct phy_device *phydev; 210 211 phydev = container_of(mdiodev, struct phy_device, mdio); 212 phy_device_free(phydev); 213 } 214 215 static void phy_device_release(struct device *dev) 216 { 217 kfree(to_phy_device(dev)); 218 } 219 220 static void phy_mdio_device_remove(struct mdio_device *mdiodev) 221 { 222 struct phy_device *phydev; 223 224 phydev = container_of(mdiodev, struct phy_device, mdio); 225 phy_device_remove(phydev); 226 } 227 228 static struct phy_driver genphy_driver; 229 extern struct phy_driver genphy_c45_driver; 230 231 static LIST_HEAD(phy_fixup_list); 232 static DEFINE_MUTEX(phy_fixup_lock); 233 234 #ifdef CONFIG_PM 235 static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) 236 { 237 struct device_driver *drv = phydev->mdio.dev.driver; 238 struct phy_driver *phydrv = to_phy_driver(drv); 239 struct net_device *netdev = phydev->attached_dev; 240 241 if (!drv || !phydrv->suspend) 242 return false; 243 244 /* PHY not attached? May suspend if the PHY has not already been 245 * suspended as part of a prior call to phy_disconnect() -> 246 * phy_detach() -> phy_suspend() because the parent netdev might be the 247 * MDIO bus driver and clock gated at this point. 248 */ 249 if (!netdev) 250 goto out; 251 252 if (netdev->wol_enabled) 253 return false; 254 255 /* As long as not all affected network drivers support the 256 * wol_enabled flag, let's check for hints that WoL is enabled. 257 * Don't suspend PHY if the attached netdev parent may wake up. 258 * The parent may point to a PCI device, as in tg3 driver. 259 */ 260 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) 261 return false; 262 263 /* Also don't suspend PHY if the netdev itself may wakeup. This 264 * is the case for devices w/o underlaying pwr. mgmt. aware bus, 265 * e.g. SoC devices. 266 */ 267 if (device_may_wakeup(&netdev->dev)) 268 return false; 269 270 out: 271 return !phydev->suspended; 272 } 273 274 static int mdio_bus_phy_suspend(struct device *dev) 275 { 276 struct phy_device *phydev = to_phy_device(dev); 277 278 /* We must stop the state machine manually, otherwise it stops out of 279 * control, possibly with the phydev->lock held. Upon resume, netdev 280 * may call phy routines that try to grab the same lock, and that may 281 * lead to a deadlock. 282 */ 283 if (phydev->attached_dev && phydev->adjust_link) 284 phy_stop_machine(phydev); 285 286 if (!mdio_bus_phy_may_suspend(phydev)) 287 return 0; 288 289 phydev->suspended_by_mdio_bus = 1; 290 291 return phy_suspend(phydev); 292 } 293 294 static int mdio_bus_phy_resume(struct device *dev) 295 { 296 struct phy_device *phydev = to_phy_device(dev); 297 int ret; 298 299 if (!phydev->suspended_by_mdio_bus) 300 goto no_resume; 301 302 phydev->suspended_by_mdio_bus = 0; 303 304 ret = phy_resume(phydev); 305 if (ret < 0) 306 return ret; 307 308 no_resume: 309 if (phydev->attached_dev && phydev->adjust_link) 310 phy_start_machine(phydev); 311 312 return 0; 313 } 314 315 static int mdio_bus_phy_restore(struct device *dev) 316 { 317 struct phy_device *phydev = to_phy_device(dev); 318 struct net_device *netdev = phydev->attached_dev; 319 int ret; 320 321 if (!netdev) 322 return 0; 323 324 ret = phy_init_hw(phydev); 325 if (ret < 0) 326 return ret; 327 328 if (phydev->attached_dev && phydev->adjust_link) 329 phy_start_machine(phydev); 330 331 return 0; 332 } 333 334 static const struct dev_pm_ops mdio_bus_phy_pm_ops = { 335 .suspend = mdio_bus_phy_suspend, 336 .resume = mdio_bus_phy_resume, 337 .freeze = mdio_bus_phy_suspend, 338 .thaw = mdio_bus_phy_resume, 339 .restore = mdio_bus_phy_restore, 340 }; 341 342 #define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops) 343 344 #else 345 346 #define MDIO_BUS_PHY_PM_OPS NULL 347 348 #endif /* CONFIG_PM */ 349 350 /** 351 * phy_register_fixup - creates a new phy_fixup and adds it to the list 352 * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID) 353 * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) 354 * It can also be PHY_ANY_UID 355 * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before 356 * comparison 357 * @run: The actual code to be run when a matching PHY is found 358 */ 359 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, 360 int (*run)(struct phy_device *)) 361 { 362 struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); 363 364 if (!fixup) 365 return -ENOMEM; 366 367 strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); 368 fixup->phy_uid = phy_uid; 369 fixup->phy_uid_mask = phy_uid_mask; 370 fixup->run = run; 371 372 mutex_lock(&phy_fixup_lock); 373 list_add_tail(&fixup->list, &phy_fixup_list); 374 mutex_unlock(&phy_fixup_lock); 375 376 return 0; 377 } 378 EXPORT_SYMBOL(phy_register_fixup); 379 380 /* Registers a fixup to be run on any PHY with the UID in phy_uid */ 381 int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, 382 int (*run)(struct phy_device *)) 383 { 384 return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); 385 } 386 EXPORT_SYMBOL(phy_register_fixup_for_uid); 387 388 /* Registers a fixup to be run on the PHY with id string bus_id */ 389 int phy_register_fixup_for_id(const char *bus_id, 390 int (*run)(struct phy_device *)) 391 { 392 return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); 393 } 394 EXPORT_SYMBOL(phy_register_fixup_for_id); 395 396 /** 397 * phy_unregister_fixup - remove a phy_fixup from the list 398 * @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list 399 * @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list 400 * @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison 401 */ 402 int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask) 403 { 404 struct list_head *pos, *n; 405 struct phy_fixup *fixup; 406 int ret; 407 408 ret = -ENODEV; 409 410 mutex_lock(&phy_fixup_lock); 411 list_for_each_safe(pos, n, &phy_fixup_list) { 412 fixup = list_entry(pos, struct phy_fixup, list); 413 414 if ((!strcmp(fixup->bus_id, bus_id)) && 415 ((fixup->phy_uid & phy_uid_mask) == 416 (phy_uid & phy_uid_mask))) { 417 list_del(&fixup->list); 418 kfree(fixup); 419 ret = 0; 420 break; 421 } 422 } 423 mutex_unlock(&phy_fixup_lock); 424 425 return ret; 426 } 427 EXPORT_SYMBOL(phy_unregister_fixup); 428 429 /* Unregisters a fixup of any PHY with the UID in phy_uid */ 430 int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask) 431 { 432 return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask); 433 } 434 EXPORT_SYMBOL(phy_unregister_fixup_for_uid); 435 436 /* Unregisters a fixup of the PHY with id string bus_id */ 437 int phy_unregister_fixup_for_id(const char *bus_id) 438 { 439 return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff); 440 } 441 EXPORT_SYMBOL(phy_unregister_fixup_for_id); 442 443 /* Returns 1 if fixup matches phydev in bus_id and phy_uid. 444 * Fixups can be set to match any in one or more fields. 445 */ 446 static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) 447 { 448 if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0) 449 if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) 450 return 0; 451 452 if ((fixup->phy_uid & fixup->phy_uid_mask) != 453 (phydev->phy_id & fixup->phy_uid_mask)) 454 if (fixup->phy_uid != PHY_ANY_UID) 455 return 0; 456 457 return 1; 458 } 459 460 /* Runs any matching fixups for this phydev */ 461 static int phy_scan_fixups(struct phy_device *phydev) 462 { 463 struct phy_fixup *fixup; 464 465 mutex_lock(&phy_fixup_lock); 466 list_for_each_entry(fixup, &phy_fixup_list, list) { 467 if (phy_needs_fixup(phydev, fixup)) { 468 int err = fixup->run(phydev); 469 470 if (err < 0) { 471 mutex_unlock(&phy_fixup_lock); 472 return err; 473 } 474 phydev->has_fixups = true; 475 } 476 } 477 mutex_unlock(&phy_fixup_lock); 478 479 return 0; 480 } 481 482 static int phy_bus_match(struct device *dev, struct device_driver *drv) 483 { 484 struct phy_device *phydev = to_phy_device(dev); 485 struct phy_driver *phydrv = to_phy_driver(drv); 486 const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids); 487 int i; 488 489 if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)) 490 return 0; 491 492 if (phydrv->match_phy_device) 493 return phydrv->match_phy_device(phydev); 494 495 if (phydev->is_c45) { 496 for (i = 1; i < num_ids; i++) { 497 if (phydev->c45_ids.device_ids[i] == 0xffffffff) 498 continue; 499 500 if ((phydrv->phy_id & phydrv->phy_id_mask) == 501 (phydev->c45_ids.device_ids[i] & 502 phydrv->phy_id_mask)) 503 return 1; 504 } 505 return 0; 506 } else { 507 return (phydrv->phy_id & phydrv->phy_id_mask) == 508 (phydev->phy_id & phydrv->phy_id_mask); 509 } 510 } 511 512 static ssize_t 513 phy_id_show(struct device *dev, struct device_attribute *attr, char *buf) 514 { 515 struct phy_device *phydev = to_phy_device(dev); 516 517 return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id); 518 } 519 static DEVICE_ATTR_RO(phy_id); 520 521 static ssize_t 522 phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf) 523 { 524 struct phy_device *phydev = to_phy_device(dev); 525 const char *mode = NULL; 526 527 if (phy_is_internal(phydev)) 528 mode = "internal"; 529 else 530 mode = phy_modes(phydev->interface); 531 532 return sprintf(buf, "%s\n", mode); 533 } 534 static DEVICE_ATTR_RO(phy_interface); 535 536 static ssize_t 537 phy_has_fixups_show(struct device *dev, struct device_attribute *attr, 538 char *buf) 539 { 540 struct phy_device *phydev = to_phy_device(dev); 541 542 return sprintf(buf, "%d\n", phydev->has_fixups); 543 } 544 static DEVICE_ATTR_RO(phy_has_fixups); 545 546 static struct attribute *phy_dev_attrs[] = { 547 &dev_attr_phy_id.attr, 548 &dev_attr_phy_interface.attr, 549 &dev_attr_phy_has_fixups.attr, 550 NULL, 551 }; 552 ATTRIBUTE_GROUPS(phy_dev); 553 554 static const struct device_type mdio_bus_phy_type = { 555 .name = "PHY", 556 .groups = phy_dev_groups, 557 .release = phy_device_release, 558 .pm = MDIO_BUS_PHY_PM_OPS, 559 }; 560 561 static int phy_request_driver_module(struct phy_device *dev, u32 phy_id) 562 { 563 int ret; 564 565 ret = request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, 566 MDIO_ID_ARGS(phy_id)); 567 /* We only check for failures in executing the usermode binary, 568 * not whether a PHY driver module exists for the PHY ID. 569 * Accept -ENOENT because this may occur in case no initramfs exists, 570 * then modprobe isn't available. 571 */ 572 if (IS_ENABLED(CONFIG_MODULES) && ret < 0 && ret != -ENOENT) { 573 phydev_err(dev, "error %d loading PHY driver module for ID 0x%08lx\n", 574 ret, (unsigned long)phy_id); 575 return ret; 576 } 577 578 return 0; 579 } 580 581 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id, 582 bool is_c45, 583 struct phy_c45_device_ids *c45_ids) 584 { 585 struct phy_device *dev; 586 struct mdio_device *mdiodev; 587 int ret = 0; 588 589 /* We allocate the device, and initialize the default values */ 590 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 591 if (!dev) 592 return ERR_PTR(-ENOMEM); 593 594 mdiodev = &dev->mdio; 595 mdiodev->dev.parent = &bus->dev; 596 mdiodev->dev.bus = &mdio_bus_type; 597 mdiodev->dev.type = &mdio_bus_phy_type; 598 mdiodev->bus = bus; 599 mdiodev->bus_match = phy_bus_match; 600 mdiodev->addr = addr; 601 mdiodev->flags = MDIO_DEVICE_FLAG_PHY; 602 mdiodev->device_free = phy_mdio_device_free; 603 mdiodev->device_remove = phy_mdio_device_remove; 604 605 dev->speed = SPEED_UNKNOWN; 606 dev->duplex = DUPLEX_UNKNOWN; 607 dev->pause = 0; 608 dev->asym_pause = 0; 609 dev->link = 0; 610 dev->interface = PHY_INTERFACE_MODE_GMII; 611 612 dev->autoneg = AUTONEG_ENABLE; 613 614 dev->is_c45 = is_c45; 615 dev->phy_id = phy_id; 616 if (c45_ids) 617 dev->c45_ids = *c45_ids; 618 dev->irq = bus->irq[addr]; 619 dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); 620 621 dev->state = PHY_DOWN; 622 623 mutex_init(&dev->lock); 624 INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); 625 626 /* Request the appropriate module unconditionally; don't 627 * bother trying to do so only if it isn't already loaded, 628 * because that gets complicated. A hotplug event would have 629 * done an unconditional modprobe anyway. 630 * We don't do normal hotplug because it won't work for MDIO 631 * -- because it relies on the device staying around for long 632 * enough for the driver to get loaded. With MDIO, the NIC 633 * driver will get bored and give up as soon as it finds that 634 * there's no driver _already_ loaded. 635 */ 636 if (is_c45 && c45_ids) { 637 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 638 int i; 639 640 for (i = 1; i < num_ids; i++) { 641 if (c45_ids->device_ids[i] == 0xffffffff) 642 continue; 643 644 ret = phy_request_driver_module(dev, 645 c45_ids->device_ids[i]); 646 if (ret) 647 break; 648 } 649 } else { 650 ret = phy_request_driver_module(dev, phy_id); 651 } 652 653 if (!ret) { 654 device_initialize(&mdiodev->dev); 655 } else { 656 kfree(dev); 657 dev = ERR_PTR(ret); 658 } 659 660 return dev; 661 } 662 EXPORT_SYMBOL(phy_device_create); 663 664 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers. 665 * @bus: the target MII bus 666 * @addr: PHY address on the MII bus 667 * @dev_addr: MMD address in the PHY. 668 * @devices_in_package: where to store the devices in package information. 669 * 670 * Description: reads devices in package registers of a MMD at @dev_addr 671 * from PHY at @addr on @bus. 672 * 673 * Returns: 0 on success, -EIO on failure. 674 */ 675 static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr, 676 u32 *devices_in_package) 677 { 678 int phy_reg, reg_addr; 679 680 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2; 681 phy_reg = mdiobus_read(bus, addr, reg_addr); 682 if (phy_reg < 0) 683 return -EIO; 684 *devices_in_package = phy_reg << 16; 685 686 reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1; 687 phy_reg = mdiobus_read(bus, addr, reg_addr); 688 if (phy_reg < 0) 689 return -EIO; 690 *devices_in_package |= phy_reg; 691 692 /* Bit 0 doesn't represent a device, it indicates c22 regs presence */ 693 *devices_in_package &= ~BIT(0); 694 695 return 0; 696 } 697 698 /** 699 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs. 700 * @bus: the target MII bus 701 * @addr: PHY address on the MII bus 702 * @phy_id: where to store the ID retrieved. 703 * @c45_ids: where to store the c45 ID information. 704 * 705 * If the PHY devices-in-package appears to be valid, it and the 706 * corresponding identifiers are stored in @c45_ids, zero is stored 707 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns 708 * zero on success. 709 * 710 */ 711 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id, 712 struct phy_c45_device_ids *c45_ids) { 713 int phy_reg; 714 int i, reg_addr; 715 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 716 u32 *devs = &c45_ids->devices_in_package; 717 718 /* Find first non-zero Devices In package. Device zero is reserved 719 * for 802.3 c45 complied PHYs, so don't probe it at first. 720 */ 721 for (i = 1; i < num_ids && *devs == 0; i++) { 722 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs); 723 if (phy_reg < 0) 724 return -EIO; 725 726 if ((*devs & 0x1fffffff) == 0x1fffffff) { 727 /* If mostly Fs, there is no device there, 728 * then let's continue to probe more, as some 729 * 10G PHYs have zero Devices In package, 730 * e.g. Cortina CS4315/CS4340 PHY. 731 */ 732 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs); 733 if (phy_reg < 0) 734 return -EIO; 735 /* no device there, let's get out of here */ 736 if ((*devs & 0x1fffffff) == 0x1fffffff) { 737 *phy_id = 0xffffffff; 738 return 0; 739 } else { 740 break; 741 } 742 } 743 } 744 745 /* Now probe Device Identifiers for each device present. */ 746 for (i = 1; i < num_ids; i++) { 747 if (!(c45_ids->devices_in_package & (1 << i))) 748 continue; 749 750 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1; 751 phy_reg = mdiobus_read(bus, addr, reg_addr); 752 if (phy_reg < 0) 753 return -EIO; 754 c45_ids->device_ids[i] = phy_reg << 16; 755 756 reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2; 757 phy_reg = mdiobus_read(bus, addr, reg_addr); 758 if (phy_reg < 0) 759 return -EIO; 760 c45_ids->device_ids[i] |= phy_reg; 761 } 762 *phy_id = 0; 763 return 0; 764 } 765 766 /** 767 * get_phy_id - reads the specified addr for its ID. 768 * @bus: the target MII bus 769 * @addr: PHY address on the MII bus 770 * @phy_id: where to store the ID retrieved. 771 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 772 * @c45_ids: where to store the c45 ID information. 773 * 774 * Description: In the case of a 802.3-c22 PHY, reads the ID registers 775 * of the PHY at @addr on the @bus, stores it in @phy_id and returns 776 * zero on success. 777 * 778 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and 779 * its return value is in turn returned. 780 * 781 */ 782 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id, 783 bool is_c45, struct phy_c45_device_ids *c45_ids) 784 { 785 int phy_reg; 786 787 if (is_c45) 788 return get_phy_c45_ids(bus, addr, phy_id, c45_ids); 789 790 /* Grab the bits from PHYIR1, and put them in the upper half */ 791 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1); 792 if (phy_reg < 0) { 793 /* returning -ENODEV doesn't stop bus scanning */ 794 return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO; 795 } 796 797 *phy_id = phy_reg << 16; 798 799 /* Grab the bits from PHYIR2, and put them in the lower half */ 800 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2); 801 if (phy_reg < 0) 802 return -EIO; 803 804 *phy_id |= phy_reg; 805 806 return 0; 807 } 808 809 /** 810 * get_phy_device - reads the specified PHY device and returns its @phy_device 811 * struct 812 * @bus: the target MII bus 813 * @addr: PHY address on the MII bus 814 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 815 * 816 * Description: Reads the ID registers of the PHY at @addr on the 817 * @bus, then allocates and returns the phy_device to represent it. 818 */ 819 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45) 820 { 821 struct phy_c45_device_ids c45_ids; 822 u32 phy_id = 0; 823 int r; 824 825 c45_ids.devices_in_package = 0; 826 memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids)); 827 828 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids); 829 if (r) 830 return ERR_PTR(r); 831 832 /* If the phy_id is mostly Fs, there is no device there */ 833 if ((phy_id & 0x1fffffff) == 0x1fffffff) 834 return ERR_PTR(-ENODEV); 835 836 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids); 837 } 838 EXPORT_SYMBOL(get_phy_device); 839 840 /** 841 * phy_device_register - Register the phy device on the MDIO bus 842 * @phydev: phy_device structure to be added to the MDIO bus 843 */ 844 int phy_device_register(struct phy_device *phydev) 845 { 846 int err; 847 848 err = mdiobus_register_device(&phydev->mdio); 849 if (err) 850 return err; 851 852 /* Deassert the reset signal */ 853 phy_device_reset(phydev, 0); 854 855 /* Run all of the fixups for this PHY */ 856 err = phy_scan_fixups(phydev); 857 if (err) { 858 phydev_err(phydev, "failed to initialize\n"); 859 goto out; 860 } 861 862 err = device_add(&phydev->mdio.dev); 863 if (err) { 864 phydev_err(phydev, "failed to add\n"); 865 goto out; 866 } 867 868 return 0; 869 870 out: 871 /* Assert the reset signal */ 872 phy_device_reset(phydev, 1); 873 874 mdiobus_unregister_device(&phydev->mdio); 875 return err; 876 } 877 EXPORT_SYMBOL(phy_device_register); 878 879 /** 880 * phy_device_remove - Remove a previously registered phy device from the MDIO bus 881 * @phydev: phy_device structure to remove 882 * 883 * This doesn't free the phy_device itself, it merely reverses the effects 884 * of phy_device_register(). Use phy_device_free() to free the device 885 * after calling this function. 886 */ 887 void phy_device_remove(struct phy_device *phydev) 888 { 889 if (phydev->mii_ts) 890 unregister_mii_timestamper(phydev->mii_ts); 891 892 device_del(&phydev->mdio.dev); 893 894 /* Assert the reset signal */ 895 phy_device_reset(phydev, 1); 896 897 mdiobus_unregister_device(&phydev->mdio); 898 } 899 EXPORT_SYMBOL(phy_device_remove); 900 901 /** 902 * phy_find_first - finds the first PHY device on the bus 903 * @bus: the target MII bus 904 */ 905 struct phy_device *phy_find_first(struct mii_bus *bus) 906 { 907 struct phy_device *phydev; 908 int addr; 909 910 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 911 phydev = mdiobus_get_phy(bus, addr); 912 if (phydev) 913 return phydev; 914 } 915 return NULL; 916 } 917 EXPORT_SYMBOL(phy_find_first); 918 919 static void phy_link_change(struct phy_device *phydev, bool up) 920 { 921 struct net_device *netdev = phydev->attached_dev; 922 923 if (up) 924 netif_carrier_on(netdev); 925 else 926 netif_carrier_off(netdev); 927 phydev->adjust_link(netdev); 928 if (phydev->mii_ts && phydev->mii_ts->link_state) 929 phydev->mii_ts->link_state(phydev->mii_ts, phydev); 930 } 931 932 /** 933 * phy_prepare_link - prepares the PHY layer to monitor link status 934 * @phydev: target phy_device struct 935 * @handler: callback function for link status change notifications 936 * 937 * Description: Tells the PHY infrastructure to handle the 938 * gory details on monitoring link status (whether through 939 * polling or an interrupt), and to call back to the 940 * connected device driver when the link status changes. 941 * If you want to monitor your own link state, don't call 942 * this function. 943 */ 944 static void phy_prepare_link(struct phy_device *phydev, 945 void (*handler)(struct net_device *)) 946 { 947 phydev->adjust_link = handler; 948 } 949 950 /** 951 * phy_connect_direct - connect an ethernet device to a specific phy_device 952 * @dev: the network device to connect 953 * @phydev: the pointer to the phy device 954 * @handler: callback function for state change notifications 955 * @interface: PHY device's interface 956 */ 957 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev, 958 void (*handler)(struct net_device *), 959 phy_interface_t interface) 960 { 961 int rc; 962 963 if (!dev) 964 return -EINVAL; 965 966 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 967 if (rc) 968 return rc; 969 970 phy_prepare_link(phydev, handler); 971 if (phy_interrupt_is_valid(phydev)) 972 phy_request_interrupt(phydev); 973 974 return 0; 975 } 976 EXPORT_SYMBOL(phy_connect_direct); 977 978 /** 979 * phy_connect - connect an ethernet device to a PHY device 980 * @dev: the network device to connect 981 * @bus_id: the id string of the PHY device to connect 982 * @handler: callback function for state change notifications 983 * @interface: PHY device's interface 984 * 985 * Description: Convenience function for connecting ethernet 986 * devices to PHY devices. The default behavior is for 987 * the PHY infrastructure to handle everything, and only notify 988 * the connected driver when the link status changes. If you 989 * don't want, or can't use the provided functionality, you may 990 * choose to call only the subset of functions which provide 991 * the desired functionality. 992 */ 993 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id, 994 void (*handler)(struct net_device *), 995 phy_interface_t interface) 996 { 997 struct phy_device *phydev; 998 struct device *d; 999 int rc; 1000 1001 /* Search the list of PHY devices on the mdio bus for the 1002 * PHY with the requested name 1003 */ 1004 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id); 1005 if (!d) { 1006 pr_err("PHY %s not found\n", bus_id); 1007 return ERR_PTR(-ENODEV); 1008 } 1009 phydev = to_phy_device(d); 1010 1011 rc = phy_connect_direct(dev, phydev, handler, interface); 1012 put_device(d); 1013 if (rc) 1014 return ERR_PTR(rc); 1015 1016 return phydev; 1017 } 1018 EXPORT_SYMBOL(phy_connect); 1019 1020 /** 1021 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY 1022 * device 1023 * @phydev: target phy_device struct 1024 */ 1025 void phy_disconnect(struct phy_device *phydev) 1026 { 1027 if (phy_is_started(phydev)) 1028 phy_stop(phydev); 1029 1030 if (phy_interrupt_is_valid(phydev)) 1031 phy_free_interrupt(phydev); 1032 1033 phydev->adjust_link = NULL; 1034 1035 phy_detach(phydev); 1036 } 1037 EXPORT_SYMBOL(phy_disconnect); 1038 1039 /** 1040 * phy_poll_reset - Safely wait until a PHY reset has properly completed 1041 * @phydev: The PHY device to poll 1042 * 1043 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as 1044 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR 1045 * register must be polled until the BMCR_RESET bit clears. 1046 * 1047 * Furthermore, any attempts to write to PHY registers may have no effect 1048 * or even generate MDIO bus errors until this is complete. 1049 * 1050 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the 1051 * standard and do not fully reset after the BMCR_RESET bit is set, and may 1052 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an 1053 * effort to support such broken PHYs, this function is separate from the 1054 * standard phy_init_hw() which will zero all the other bits in the BMCR 1055 * and reapply all driver-specific and board-specific fixups. 1056 */ 1057 static int phy_poll_reset(struct phy_device *phydev) 1058 { 1059 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ 1060 int ret, val; 1061 1062 ret = phy_read_poll_timeout(phydev, MII_BMCR, val, !(val & BMCR_RESET), 1063 50000, 600000, true); 1064 if (ret) 1065 return ret; 1066 /* Some chips (smsc911x) may still need up to another 1ms after the 1067 * BMCR_RESET bit is cleared before they are usable. 1068 */ 1069 msleep(1); 1070 return 0; 1071 } 1072 1073 int phy_init_hw(struct phy_device *phydev) 1074 { 1075 int ret = 0; 1076 1077 /* Deassert the reset signal */ 1078 phy_device_reset(phydev, 0); 1079 1080 if (!phydev->drv) 1081 return 0; 1082 1083 if (phydev->drv->soft_reset) { 1084 ret = phydev->drv->soft_reset(phydev); 1085 /* see comment in genphy_soft_reset for an explanation */ 1086 if (!ret) 1087 phydev->suspended = 0; 1088 } 1089 1090 if (ret < 0) 1091 return ret; 1092 1093 ret = phy_scan_fixups(phydev); 1094 if (ret < 0) 1095 return ret; 1096 1097 if (phydev->drv->config_init) 1098 ret = phydev->drv->config_init(phydev); 1099 1100 return ret; 1101 } 1102 EXPORT_SYMBOL(phy_init_hw); 1103 1104 void phy_attached_info(struct phy_device *phydev) 1105 { 1106 phy_attached_print(phydev, NULL); 1107 } 1108 EXPORT_SYMBOL(phy_attached_info); 1109 1110 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%s)" 1111 char *phy_attached_info_irq(struct phy_device *phydev) 1112 { 1113 char *irq_str; 1114 char irq_num[8]; 1115 1116 switch(phydev->irq) { 1117 case PHY_POLL: 1118 irq_str = "POLL"; 1119 break; 1120 case PHY_IGNORE_INTERRUPT: 1121 irq_str = "IGNORE"; 1122 break; 1123 default: 1124 snprintf(irq_num, sizeof(irq_num), "%d", phydev->irq); 1125 irq_str = irq_num; 1126 break; 1127 } 1128 1129 return kasprintf(GFP_KERNEL, "%s", irq_str); 1130 } 1131 EXPORT_SYMBOL(phy_attached_info_irq); 1132 1133 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...) 1134 { 1135 const char *drv_name = phydev->drv ? phydev->drv->name : "unbound"; 1136 char *irq_str = phy_attached_info_irq(phydev); 1137 1138 if (!fmt) { 1139 phydev_info(phydev, ATTACHED_FMT "\n", 1140 drv_name, phydev_name(phydev), 1141 irq_str); 1142 } else { 1143 va_list ap; 1144 1145 phydev_info(phydev, ATTACHED_FMT, 1146 drv_name, phydev_name(phydev), 1147 irq_str); 1148 1149 va_start(ap, fmt); 1150 vprintk(fmt, ap); 1151 va_end(ap); 1152 } 1153 kfree(irq_str); 1154 } 1155 EXPORT_SYMBOL(phy_attached_print); 1156 1157 static void phy_sysfs_create_links(struct phy_device *phydev) 1158 { 1159 struct net_device *dev = phydev->attached_dev; 1160 int err; 1161 1162 if (!dev) 1163 return; 1164 1165 err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj, 1166 "attached_dev"); 1167 if (err) 1168 return; 1169 1170 err = sysfs_create_link_nowarn(&dev->dev.kobj, 1171 &phydev->mdio.dev.kobj, 1172 "phydev"); 1173 if (err) { 1174 dev_err(&dev->dev, "could not add device link to %s err %d\n", 1175 kobject_name(&phydev->mdio.dev.kobj), 1176 err); 1177 /* non-fatal - some net drivers can use one netdevice 1178 * with more then one phy 1179 */ 1180 } 1181 1182 phydev->sysfs_links = true; 1183 } 1184 1185 static ssize_t 1186 phy_standalone_show(struct device *dev, struct device_attribute *attr, 1187 char *buf) 1188 { 1189 struct phy_device *phydev = to_phy_device(dev); 1190 1191 return sprintf(buf, "%d\n", !phydev->attached_dev); 1192 } 1193 static DEVICE_ATTR_RO(phy_standalone); 1194 1195 /** 1196 * phy_sfp_attach - attach the SFP bus to the PHY upstream network device 1197 * @upstream: pointer to the phy device 1198 * @bus: sfp bus representing cage being attached 1199 * 1200 * This is used to fill in the sfp_upstream_ops .attach member. 1201 */ 1202 void phy_sfp_attach(void *upstream, struct sfp_bus *bus) 1203 { 1204 struct phy_device *phydev = upstream; 1205 1206 if (phydev->attached_dev) 1207 phydev->attached_dev->sfp_bus = bus; 1208 phydev->sfp_bus_attached = true; 1209 } 1210 EXPORT_SYMBOL(phy_sfp_attach); 1211 1212 /** 1213 * phy_sfp_detach - detach the SFP bus from the PHY upstream network device 1214 * @upstream: pointer to the phy device 1215 * @bus: sfp bus representing cage being attached 1216 * 1217 * This is used to fill in the sfp_upstream_ops .detach member. 1218 */ 1219 void phy_sfp_detach(void *upstream, struct sfp_bus *bus) 1220 { 1221 struct phy_device *phydev = upstream; 1222 1223 if (phydev->attached_dev) 1224 phydev->attached_dev->sfp_bus = NULL; 1225 phydev->sfp_bus_attached = false; 1226 } 1227 EXPORT_SYMBOL(phy_sfp_detach); 1228 1229 /** 1230 * phy_sfp_probe - probe for a SFP cage attached to this PHY device 1231 * @phydev: Pointer to phy_device 1232 * @ops: SFP's upstream operations 1233 */ 1234 int phy_sfp_probe(struct phy_device *phydev, 1235 const struct sfp_upstream_ops *ops) 1236 { 1237 struct sfp_bus *bus; 1238 int ret; 1239 1240 if (phydev->mdio.dev.fwnode) { 1241 bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode); 1242 if (IS_ERR(bus)) 1243 return PTR_ERR(bus); 1244 1245 phydev->sfp_bus = bus; 1246 1247 ret = sfp_bus_add_upstream(bus, phydev, ops); 1248 sfp_bus_put(bus); 1249 } 1250 return 0; 1251 } 1252 EXPORT_SYMBOL(phy_sfp_probe); 1253 1254 /** 1255 * phy_attach_direct - attach a network device to a given PHY device pointer 1256 * @dev: network device to attach 1257 * @phydev: Pointer to phy_device to attach 1258 * @flags: PHY device's dev_flags 1259 * @interface: PHY device's interface 1260 * 1261 * Description: Called by drivers to attach to a particular PHY 1262 * device. The phy_device is found, and properly hooked up 1263 * to the phy_driver. If no driver is attached, then a 1264 * generic driver is used. The phy_device is given a ptr to 1265 * the attaching device, and given a callback for link status 1266 * change. The phy_device is returned to the attaching driver. 1267 * This function takes a reference on the phy device. 1268 */ 1269 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 1270 u32 flags, phy_interface_t interface) 1271 { 1272 struct mii_bus *bus = phydev->mdio.bus; 1273 struct device *d = &phydev->mdio.dev; 1274 struct module *ndev_owner = NULL; 1275 bool using_genphy = false; 1276 int err; 1277 1278 /* For Ethernet device drivers that register their own MDIO bus, we 1279 * will have bus->owner match ndev_mod, so we do not want to increment 1280 * our own module->refcnt here, otherwise we would not be able to 1281 * unload later on. 1282 */ 1283 if (dev) 1284 ndev_owner = dev->dev.parent->driver->owner; 1285 if (ndev_owner != bus->owner && !try_module_get(bus->owner)) { 1286 phydev_err(phydev, "failed to get the bus module\n"); 1287 return -EIO; 1288 } 1289 1290 get_device(d); 1291 1292 /* Assume that if there is no driver, that it doesn't 1293 * exist, and we should use the genphy driver. 1294 */ 1295 if (!d->driver) { 1296 if (phydev->is_c45) 1297 d->driver = &genphy_c45_driver.mdiodrv.driver; 1298 else 1299 d->driver = &genphy_driver.mdiodrv.driver; 1300 1301 using_genphy = true; 1302 } 1303 1304 if (!try_module_get(d->driver->owner)) { 1305 phydev_err(phydev, "failed to get the device driver module\n"); 1306 err = -EIO; 1307 goto error_put_device; 1308 } 1309 1310 if (using_genphy) { 1311 err = d->driver->probe(d); 1312 if (err >= 0) 1313 err = device_bind_driver(d); 1314 1315 if (err) 1316 goto error_module_put; 1317 } 1318 1319 if (phydev->attached_dev) { 1320 dev_err(&dev->dev, "PHY already attached\n"); 1321 err = -EBUSY; 1322 goto error; 1323 } 1324 1325 phydev->phy_link_change = phy_link_change; 1326 if (dev) { 1327 phydev->attached_dev = dev; 1328 dev->phydev = phydev; 1329 1330 if (phydev->sfp_bus_attached) 1331 dev->sfp_bus = phydev->sfp_bus; 1332 } 1333 1334 /* Some Ethernet drivers try to connect to a PHY device before 1335 * calling register_netdevice() -> netdev_register_kobject() and 1336 * does the dev->dev.kobj initialization. Here we only check for 1337 * success which indicates that the network device kobject is 1338 * ready. Once we do that we still need to keep track of whether 1339 * links were successfully set up or not for phy_detach() to 1340 * remove them accordingly. 1341 */ 1342 phydev->sysfs_links = false; 1343 1344 phy_sysfs_create_links(phydev); 1345 1346 if (!phydev->attached_dev) { 1347 err = sysfs_create_file(&phydev->mdio.dev.kobj, 1348 &dev_attr_phy_standalone.attr); 1349 if (err) 1350 phydev_err(phydev, "error creating 'phy_standalone' sysfs entry\n"); 1351 } 1352 1353 phydev->dev_flags |= flags; 1354 1355 phydev->interface = interface; 1356 1357 phydev->state = PHY_READY; 1358 1359 /* Initial carrier state is off as the phy is about to be 1360 * (re)initialized. 1361 */ 1362 if (dev) 1363 netif_carrier_off(phydev->attached_dev); 1364 1365 /* Do initial configuration here, now that 1366 * we have certain key parameters 1367 * (dev_flags and interface) 1368 */ 1369 err = phy_init_hw(phydev); 1370 if (err) 1371 goto error; 1372 1373 phy_resume(phydev); 1374 phy_led_triggers_register(phydev); 1375 1376 return err; 1377 1378 error: 1379 /* phy_detach() does all of the cleanup below */ 1380 phy_detach(phydev); 1381 return err; 1382 1383 error_module_put: 1384 module_put(d->driver->owner); 1385 error_put_device: 1386 put_device(d); 1387 if (ndev_owner != bus->owner) 1388 module_put(bus->owner); 1389 return err; 1390 } 1391 EXPORT_SYMBOL(phy_attach_direct); 1392 1393 /** 1394 * phy_attach - attach a network device to a particular PHY device 1395 * @dev: network device to attach 1396 * @bus_id: Bus ID of PHY device to attach 1397 * @interface: PHY device's interface 1398 * 1399 * Description: Same as phy_attach_direct() except that a PHY bus_id 1400 * string is passed instead of a pointer to a struct phy_device. 1401 */ 1402 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 1403 phy_interface_t interface) 1404 { 1405 struct bus_type *bus = &mdio_bus_type; 1406 struct phy_device *phydev; 1407 struct device *d; 1408 int rc; 1409 1410 if (!dev) 1411 return ERR_PTR(-EINVAL); 1412 1413 /* Search the list of PHY devices on the mdio bus for the 1414 * PHY with the requested name 1415 */ 1416 d = bus_find_device_by_name(bus, NULL, bus_id); 1417 if (!d) { 1418 pr_err("PHY %s not found\n", bus_id); 1419 return ERR_PTR(-ENODEV); 1420 } 1421 phydev = to_phy_device(d); 1422 1423 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 1424 put_device(d); 1425 if (rc) 1426 return ERR_PTR(rc); 1427 1428 return phydev; 1429 } 1430 EXPORT_SYMBOL(phy_attach); 1431 1432 static bool phy_driver_is_genphy_kind(struct phy_device *phydev, 1433 struct device_driver *driver) 1434 { 1435 struct device *d = &phydev->mdio.dev; 1436 bool ret = false; 1437 1438 if (!phydev->drv) 1439 return ret; 1440 1441 get_device(d); 1442 ret = d->driver == driver; 1443 put_device(d); 1444 1445 return ret; 1446 } 1447 1448 bool phy_driver_is_genphy(struct phy_device *phydev) 1449 { 1450 return phy_driver_is_genphy_kind(phydev, 1451 &genphy_driver.mdiodrv.driver); 1452 } 1453 EXPORT_SYMBOL_GPL(phy_driver_is_genphy); 1454 1455 bool phy_driver_is_genphy_10g(struct phy_device *phydev) 1456 { 1457 return phy_driver_is_genphy_kind(phydev, 1458 &genphy_c45_driver.mdiodrv.driver); 1459 } 1460 EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g); 1461 1462 /** 1463 * phy_package_join - join a common PHY group 1464 * @phydev: target phy_device struct 1465 * @addr: cookie and PHY address for global register access 1466 * @priv_size: if non-zero allocate this amount of bytes for private data 1467 * 1468 * This joins a PHY group and provides a shared storage for all phydevs in 1469 * this group. This is intended to be used for packages which contain 1470 * more than one PHY, for example a quad PHY transceiver. 1471 * 1472 * The addr parameter serves as a cookie which has to have the same value 1473 * for all members of one group and as a PHY address to access generic 1474 * registers of a PHY package. Usually, one of the PHY addresses of the 1475 * different PHYs in the package provides access to these global registers. 1476 * The address which is given here, will be used in the phy_package_read() 1477 * and phy_package_write() convenience functions. If your PHY doesn't have 1478 * global registers you can just pick any of the PHY addresses. 1479 * 1480 * This will set the shared pointer of the phydev to the shared storage. 1481 * If this is the first call for a this cookie the shared storage will be 1482 * allocated. If priv_size is non-zero, the given amount of bytes are 1483 * allocated for the priv member. 1484 * 1485 * Returns < 1 on error, 0 on success. Esp. calling phy_package_join() 1486 * with the same cookie but a different priv_size is an error. 1487 */ 1488 int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size) 1489 { 1490 struct mii_bus *bus = phydev->mdio.bus; 1491 struct phy_package_shared *shared; 1492 int ret; 1493 1494 if (addr < 0 || addr >= PHY_MAX_ADDR) 1495 return -EINVAL; 1496 1497 mutex_lock(&bus->shared_lock); 1498 shared = bus->shared[addr]; 1499 if (!shared) { 1500 ret = -ENOMEM; 1501 shared = kzalloc(sizeof(*shared), GFP_KERNEL); 1502 if (!shared) 1503 goto err_unlock; 1504 if (priv_size) { 1505 shared->priv = kzalloc(priv_size, GFP_KERNEL); 1506 if (!shared->priv) 1507 goto err_free; 1508 shared->priv_size = priv_size; 1509 } 1510 shared->addr = addr; 1511 refcount_set(&shared->refcnt, 1); 1512 bus->shared[addr] = shared; 1513 } else { 1514 ret = -EINVAL; 1515 if (priv_size && priv_size != shared->priv_size) 1516 goto err_unlock; 1517 refcount_inc(&shared->refcnt); 1518 } 1519 mutex_unlock(&bus->shared_lock); 1520 1521 phydev->shared = shared; 1522 1523 return 0; 1524 1525 err_free: 1526 kfree(shared); 1527 err_unlock: 1528 mutex_unlock(&bus->shared_lock); 1529 return ret; 1530 } 1531 EXPORT_SYMBOL_GPL(phy_package_join); 1532 1533 /** 1534 * phy_package_leave - leave a common PHY group 1535 * @phydev: target phy_device struct 1536 * 1537 * This leaves a PHY group created by phy_package_join(). If this phydev 1538 * was the last user of the shared data between the group, this data is 1539 * freed. Resets the phydev->shared pointer to NULL. 1540 */ 1541 void phy_package_leave(struct phy_device *phydev) 1542 { 1543 struct phy_package_shared *shared = phydev->shared; 1544 struct mii_bus *bus = phydev->mdio.bus; 1545 1546 if (!shared) 1547 return; 1548 1549 if (refcount_dec_and_mutex_lock(&shared->refcnt, &bus->shared_lock)) { 1550 bus->shared[shared->addr] = NULL; 1551 mutex_unlock(&bus->shared_lock); 1552 kfree(shared->priv); 1553 kfree(shared); 1554 } 1555 1556 phydev->shared = NULL; 1557 } 1558 EXPORT_SYMBOL_GPL(phy_package_leave); 1559 1560 static void devm_phy_package_leave(struct device *dev, void *res) 1561 { 1562 phy_package_leave(*(struct phy_device **)res); 1563 } 1564 1565 /** 1566 * devm_phy_package_join - resource managed phy_package_join() 1567 * @dev: device that is registering this PHY package 1568 * @phydev: target phy_device struct 1569 * @addr: cookie and PHY address for global register access 1570 * @priv_size: if non-zero allocate this amount of bytes for private data 1571 * 1572 * Managed phy_package_join(). Shared storage fetched by this function, 1573 * phy_package_leave() is automatically called on driver detach. See 1574 * phy_package_join() for more information. 1575 */ 1576 int devm_phy_package_join(struct device *dev, struct phy_device *phydev, 1577 int addr, size_t priv_size) 1578 { 1579 struct phy_device **ptr; 1580 int ret; 1581 1582 ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr), 1583 GFP_KERNEL); 1584 if (!ptr) 1585 return -ENOMEM; 1586 1587 ret = phy_package_join(phydev, addr, priv_size); 1588 1589 if (!ret) { 1590 *ptr = phydev; 1591 devres_add(dev, ptr); 1592 } else { 1593 devres_free(ptr); 1594 } 1595 1596 return ret; 1597 } 1598 EXPORT_SYMBOL_GPL(devm_phy_package_join); 1599 1600 /** 1601 * phy_detach - detach a PHY device from its network device 1602 * @phydev: target phy_device struct 1603 * 1604 * This detaches the phy device from its network device and the phy 1605 * driver, and drops the reference count taken in phy_attach_direct(). 1606 */ 1607 void phy_detach(struct phy_device *phydev) 1608 { 1609 struct net_device *dev = phydev->attached_dev; 1610 struct module *ndev_owner = NULL; 1611 struct mii_bus *bus; 1612 1613 if (phydev->sysfs_links) { 1614 if (dev) 1615 sysfs_remove_link(&dev->dev.kobj, "phydev"); 1616 sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev"); 1617 } 1618 1619 if (!phydev->attached_dev) 1620 sysfs_remove_file(&phydev->mdio.dev.kobj, 1621 &dev_attr_phy_standalone.attr); 1622 1623 phy_suspend(phydev); 1624 if (dev) { 1625 phydev->attached_dev->phydev = NULL; 1626 phydev->attached_dev = NULL; 1627 } 1628 phydev->phylink = NULL; 1629 1630 phy_led_triggers_unregister(phydev); 1631 1632 module_put(phydev->mdio.dev.driver->owner); 1633 1634 /* If the device had no specific driver before (i.e. - it 1635 * was using the generic driver), we unbind the device 1636 * from the generic driver so that there's a chance a 1637 * real driver could be loaded 1638 */ 1639 if (phy_driver_is_genphy(phydev) || 1640 phy_driver_is_genphy_10g(phydev)) 1641 device_release_driver(&phydev->mdio.dev); 1642 1643 /* 1644 * The phydev might go away on the put_device() below, so avoid 1645 * a use-after-free bug by reading the underlying bus first. 1646 */ 1647 bus = phydev->mdio.bus; 1648 1649 put_device(&phydev->mdio.dev); 1650 if (dev) 1651 ndev_owner = dev->dev.parent->driver->owner; 1652 if (ndev_owner != bus->owner) 1653 module_put(bus->owner); 1654 1655 /* Assert the reset signal */ 1656 phy_device_reset(phydev, 1); 1657 } 1658 EXPORT_SYMBOL(phy_detach); 1659 1660 int phy_suspend(struct phy_device *phydev) 1661 { 1662 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 1663 struct net_device *netdev = phydev->attached_dev; 1664 struct phy_driver *phydrv = phydev->drv; 1665 int ret; 1666 1667 if (phydev->suspended) 1668 return 0; 1669 1670 /* If the device has WOL enabled, we cannot suspend the PHY */ 1671 phy_ethtool_get_wol(phydev, &wol); 1672 if (wol.wolopts || (netdev && netdev->wol_enabled)) 1673 return -EBUSY; 1674 1675 if (!phydrv || !phydrv->suspend) 1676 return 0; 1677 1678 ret = phydrv->suspend(phydev); 1679 if (!ret) 1680 phydev->suspended = true; 1681 1682 return ret; 1683 } 1684 EXPORT_SYMBOL(phy_suspend); 1685 1686 int __phy_resume(struct phy_device *phydev) 1687 { 1688 struct phy_driver *phydrv = phydev->drv; 1689 int ret; 1690 1691 WARN_ON(!mutex_is_locked(&phydev->lock)); 1692 1693 if (!phydrv || !phydrv->resume) 1694 return 0; 1695 1696 ret = phydrv->resume(phydev); 1697 if (!ret) 1698 phydev->suspended = false; 1699 1700 return ret; 1701 } 1702 EXPORT_SYMBOL(__phy_resume); 1703 1704 int phy_resume(struct phy_device *phydev) 1705 { 1706 int ret; 1707 1708 mutex_lock(&phydev->lock); 1709 ret = __phy_resume(phydev); 1710 mutex_unlock(&phydev->lock); 1711 1712 return ret; 1713 } 1714 EXPORT_SYMBOL(phy_resume); 1715 1716 int phy_loopback(struct phy_device *phydev, bool enable) 1717 { 1718 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1719 int ret = 0; 1720 1721 mutex_lock(&phydev->lock); 1722 1723 if (enable && phydev->loopback_enabled) { 1724 ret = -EBUSY; 1725 goto out; 1726 } 1727 1728 if (!enable && !phydev->loopback_enabled) { 1729 ret = -EINVAL; 1730 goto out; 1731 } 1732 1733 if (phydev->drv && phydrv->set_loopback) 1734 ret = phydrv->set_loopback(phydev, enable); 1735 else 1736 ret = -EOPNOTSUPP; 1737 1738 if (ret) 1739 goto out; 1740 1741 phydev->loopback_enabled = enable; 1742 1743 out: 1744 mutex_unlock(&phydev->lock); 1745 return ret; 1746 } 1747 EXPORT_SYMBOL(phy_loopback); 1748 1749 /** 1750 * phy_reset_after_clk_enable - perform a PHY reset if needed 1751 * @phydev: target phy_device struct 1752 * 1753 * Description: Some PHYs are known to need a reset after their refclk was 1754 * enabled. This function evaluates the flags and perform the reset if it's 1755 * needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy 1756 * was reset. 1757 */ 1758 int phy_reset_after_clk_enable(struct phy_device *phydev) 1759 { 1760 if (!phydev || !phydev->drv) 1761 return -ENODEV; 1762 1763 if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) { 1764 phy_device_reset(phydev, 1); 1765 phy_device_reset(phydev, 0); 1766 return 1; 1767 } 1768 1769 return 0; 1770 } 1771 EXPORT_SYMBOL(phy_reset_after_clk_enable); 1772 1773 /* Generic PHY support and helper functions */ 1774 1775 /** 1776 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 1777 * @phydev: target phy_device struct 1778 * 1779 * Description: Writes MII_ADVERTISE with the appropriate values, 1780 * after sanitizing the values to make sure we only advertise 1781 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1782 * hasn't changed, and > 0 if it has changed. 1783 */ 1784 static int genphy_config_advert(struct phy_device *phydev) 1785 { 1786 int err, bmsr, changed = 0; 1787 u32 adv; 1788 1789 /* Only allow advertising what this PHY supports */ 1790 linkmode_and(phydev->advertising, phydev->advertising, 1791 phydev->supported); 1792 1793 adv = linkmode_adv_to_mii_adv_t(phydev->advertising); 1794 1795 /* Setup standard advertisement */ 1796 err = phy_modify_changed(phydev, MII_ADVERTISE, 1797 ADVERTISE_ALL | ADVERTISE_100BASE4 | 1798 ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM, 1799 adv); 1800 if (err < 0) 1801 return err; 1802 if (err > 0) 1803 changed = 1; 1804 1805 bmsr = phy_read(phydev, MII_BMSR); 1806 if (bmsr < 0) 1807 return bmsr; 1808 1809 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 1810 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 1811 * logical 1. 1812 */ 1813 if (!(bmsr & BMSR_ESTATEN)) 1814 return changed; 1815 1816 adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising); 1817 1818 err = phy_modify_changed(phydev, MII_CTRL1000, 1819 ADVERTISE_1000FULL | ADVERTISE_1000HALF, 1820 adv); 1821 if (err < 0) 1822 return err; 1823 if (err > 0) 1824 changed = 1; 1825 1826 return changed; 1827 } 1828 1829 /** 1830 * genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters 1831 * @phydev: target phy_device struct 1832 * 1833 * Description: Writes MII_ADVERTISE with the appropriate values, 1834 * after sanitizing the values to make sure we only advertise 1835 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1836 * hasn't changed, and > 0 if it has changed. This function is intended 1837 * for Clause 37 1000Base-X mode. 1838 */ 1839 static int genphy_c37_config_advert(struct phy_device *phydev) 1840 { 1841 u16 adv = 0; 1842 1843 /* Only allow advertising what this PHY supports */ 1844 linkmode_and(phydev->advertising, phydev->advertising, 1845 phydev->supported); 1846 1847 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 1848 phydev->advertising)) 1849 adv |= ADVERTISE_1000XFULL; 1850 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, 1851 phydev->advertising)) 1852 adv |= ADVERTISE_1000XPAUSE; 1853 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 1854 phydev->advertising)) 1855 adv |= ADVERTISE_1000XPSE_ASYM; 1856 1857 return phy_modify_changed(phydev, MII_ADVERTISE, 1858 ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE | 1859 ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM, 1860 adv); 1861 } 1862 1863 /** 1864 * genphy_config_eee_advert - disable unwanted eee mode advertisement 1865 * @phydev: target phy_device struct 1866 * 1867 * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy 1868 * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't 1869 * changed, and 1 if it has changed. 1870 */ 1871 int genphy_config_eee_advert(struct phy_device *phydev) 1872 { 1873 int err; 1874 1875 /* Nothing to disable */ 1876 if (!phydev->eee_broken_modes) 1877 return 0; 1878 1879 err = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, 1880 phydev->eee_broken_modes, 0); 1881 /* If the call failed, we assume that EEE is not supported */ 1882 return err < 0 ? 0 : err; 1883 } 1884 EXPORT_SYMBOL(genphy_config_eee_advert); 1885 1886 /** 1887 * genphy_setup_forced - configures/forces speed/duplex from @phydev 1888 * @phydev: target phy_device struct 1889 * 1890 * Description: Configures MII_BMCR to force speed/duplex 1891 * to the values in phydev. Assumes that the values are valid. 1892 * Please see phy_sanitize_settings(). 1893 */ 1894 int genphy_setup_forced(struct phy_device *phydev) 1895 { 1896 u16 ctl = 0; 1897 1898 phydev->pause = 0; 1899 phydev->asym_pause = 0; 1900 1901 if (SPEED_1000 == phydev->speed) 1902 ctl |= BMCR_SPEED1000; 1903 else if (SPEED_100 == phydev->speed) 1904 ctl |= BMCR_SPEED100; 1905 1906 if (DUPLEX_FULL == phydev->duplex) 1907 ctl |= BMCR_FULLDPLX; 1908 1909 return phy_modify(phydev, MII_BMCR, 1910 ~(BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN), ctl); 1911 } 1912 EXPORT_SYMBOL(genphy_setup_forced); 1913 1914 static int genphy_setup_master_slave(struct phy_device *phydev) 1915 { 1916 u16 ctl = 0; 1917 1918 if (!phydev->is_gigabit_capable) 1919 return 0; 1920 1921 switch (phydev->master_slave_set) { 1922 case MASTER_SLAVE_CFG_MASTER_PREFERRED: 1923 ctl |= CTL1000_PREFER_MASTER; 1924 break; 1925 case MASTER_SLAVE_CFG_SLAVE_PREFERRED: 1926 break; 1927 case MASTER_SLAVE_CFG_MASTER_FORCE: 1928 ctl |= CTL1000_AS_MASTER; 1929 /* fallthrough */ 1930 case MASTER_SLAVE_CFG_SLAVE_FORCE: 1931 ctl |= CTL1000_ENABLE_MASTER; 1932 break; 1933 case MASTER_SLAVE_CFG_UNKNOWN: 1934 case MASTER_SLAVE_CFG_UNSUPPORTED: 1935 return 0; 1936 default: 1937 phydev_warn(phydev, "Unsupported Master/Slave mode\n"); 1938 return -EOPNOTSUPP; 1939 } 1940 1941 return phy_modify_changed(phydev, MII_CTRL1000, 1942 (CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER | 1943 CTL1000_PREFER_MASTER), ctl); 1944 } 1945 1946 static int genphy_read_master_slave(struct phy_device *phydev) 1947 { 1948 int cfg, state; 1949 int val; 1950 1951 if (!phydev->is_gigabit_capable) { 1952 phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED; 1953 phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED; 1954 return 0; 1955 } 1956 1957 phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN; 1958 phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN; 1959 1960 val = phy_read(phydev, MII_CTRL1000); 1961 if (val < 0) 1962 return val; 1963 1964 if (val & CTL1000_ENABLE_MASTER) { 1965 if (val & CTL1000_AS_MASTER) 1966 cfg = MASTER_SLAVE_CFG_MASTER_FORCE; 1967 else 1968 cfg = MASTER_SLAVE_CFG_SLAVE_FORCE; 1969 } else { 1970 if (val & CTL1000_PREFER_MASTER) 1971 cfg = MASTER_SLAVE_CFG_MASTER_PREFERRED; 1972 else 1973 cfg = MASTER_SLAVE_CFG_SLAVE_PREFERRED; 1974 } 1975 1976 val = phy_read(phydev, MII_STAT1000); 1977 if (val < 0) 1978 return val; 1979 1980 if (val & LPA_1000MSFAIL) { 1981 state = MASTER_SLAVE_STATE_ERR; 1982 } else if (phydev->link) { 1983 /* this bits are valid only for active link */ 1984 if (val & LPA_1000MSRES) 1985 state = MASTER_SLAVE_STATE_MASTER; 1986 else 1987 state = MASTER_SLAVE_STATE_SLAVE; 1988 } else { 1989 state = MASTER_SLAVE_STATE_UNKNOWN; 1990 } 1991 1992 phydev->master_slave_get = cfg; 1993 phydev->master_slave_state = state; 1994 1995 return 0; 1996 } 1997 1998 /** 1999 * genphy_restart_aneg - Enable and Restart Autonegotiation 2000 * @phydev: target phy_device struct 2001 */ 2002 int genphy_restart_aneg(struct phy_device *phydev) 2003 { 2004 /* Don't isolate the PHY if we're negotiating */ 2005 return phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, 2006 BMCR_ANENABLE | BMCR_ANRESTART); 2007 } 2008 EXPORT_SYMBOL(genphy_restart_aneg); 2009 2010 /** 2011 * genphy_check_and_restart_aneg - Enable and restart auto-negotiation 2012 * @phydev: target phy_device struct 2013 * @restart: whether aneg restart is requested 2014 * 2015 * Check, and restart auto-negotiation if needed. 2016 */ 2017 int genphy_check_and_restart_aneg(struct phy_device *phydev, bool restart) 2018 { 2019 int ret; 2020 2021 if (!restart) { 2022 /* Advertisement hasn't changed, but maybe aneg was never on to 2023 * begin with? Or maybe phy was isolated? 2024 */ 2025 ret = phy_read(phydev, MII_BMCR); 2026 if (ret < 0) 2027 return ret; 2028 2029 if (!(ret & BMCR_ANENABLE) || (ret & BMCR_ISOLATE)) 2030 restart = true; 2031 } 2032 2033 if (restart) 2034 return genphy_restart_aneg(phydev); 2035 2036 return 0; 2037 } 2038 EXPORT_SYMBOL(genphy_check_and_restart_aneg); 2039 2040 /** 2041 * __genphy_config_aneg - restart auto-negotiation or write BMCR 2042 * @phydev: target phy_device struct 2043 * @changed: whether autoneg is requested 2044 * 2045 * Description: If auto-negotiation is enabled, we configure the 2046 * advertising, and then restart auto-negotiation. If it is not 2047 * enabled, then we write the BMCR. 2048 */ 2049 int __genphy_config_aneg(struct phy_device *phydev, bool changed) 2050 { 2051 int err; 2052 2053 if (genphy_config_eee_advert(phydev)) 2054 changed = true; 2055 2056 err = genphy_setup_master_slave(phydev); 2057 if (err < 0) 2058 return err; 2059 else if (err) 2060 changed = true; 2061 2062 if (AUTONEG_ENABLE != phydev->autoneg) 2063 return genphy_setup_forced(phydev); 2064 2065 err = genphy_config_advert(phydev); 2066 if (err < 0) /* error */ 2067 return err; 2068 else if (err) 2069 changed = true; 2070 2071 return genphy_check_and_restart_aneg(phydev, changed); 2072 } 2073 EXPORT_SYMBOL(__genphy_config_aneg); 2074 2075 /** 2076 * genphy_c37_config_aneg - restart auto-negotiation or write BMCR 2077 * @phydev: target phy_device struct 2078 * 2079 * Description: If auto-negotiation is enabled, we configure the 2080 * advertising, and then restart auto-negotiation. If it is not 2081 * enabled, then we write the BMCR. This function is intended 2082 * for use with Clause 37 1000Base-X mode. 2083 */ 2084 int genphy_c37_config_aneg(struct phy_device *phydev) 2085 { 2086 int err, changed; 2087 2088 if (phydev->autoneg != AUTONEG_ENABLE) 2089 return genphy_setup_forced(phydev); 2090 2091 err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100, 2092 BMCR_SPEED1000); 2093 if (err) 2094 return err; 2095 2096 changed = genphy_c37_config_advert(phydev); 2097 if (changed < 0) /* error */ 2098 return changed; 2099 2100 if (!changed) { 2101 /* Advertisement hasn't changed, but maybe aneg was never on to 2102 * begin with? Or maybe phy was isolated? 2103 */ 2104 int ctl = phy_read(phydev, MII_BMCR); 2105 2106 if (ctl < 0) 2107 return ctl; 2108 2109 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 2110 changed = 1; /* do restart aneg */ 2111 } 2112 2113 /* Only restart aneg if we are advertising something different 2114 * than we were before. 2115 */ 2116 if (changed > 0) 2117 return genphy_restart_aneg(phydev); 2118 2119 return 0; 2120 } 2121 EXPORT_SYMBOL(genphy_c37_config_aneg); 2122 2123 /** 2124 * genphy_aneg_done - return auto-negotiation status 2125 * @phydev: target phy_device struct 2126 * 2127 * Description: Reads the status register and returns 0 either if 2128 * auto-negotiation is incomplete, or if there was an error. 2129 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 2130 */ 2131 int genphy_aneg_done(struct phy_device *phydev) 2132 { 2133 int retval = phy_read(phydev, MII_BMSR); 2134 2135 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 2136 } 2137 EXPORT_SYMBOL(genphy_aneg_done); 2138 2139 /** 2140 * genphy_update_link - update link status in @phydev 2141 * @phydev: target phy_device struct 2142 * 2143 * Description: Update the value in phydev->link to reflect the 2144 * current link value. In order to do this, we need to read 2145 * the status register twice, keeping the second value. 2146 */ 2147 int genphy_update_link(struct phy_device *phydev) 2148 { 2149 int status = 0, bmcr; 2150 2151 bmcr = phy_read(phydev, MII_BMCR); 2152 if (bmcr < 0) 2153 return bmcr; 2154 2155 /* Autoneg is being started, therefore disregard BMSR value and 2156 * report link as down. 2157 */ 2158 if (bmcr & BMCR_ANRESTART) 2159 goto done; 2160 2161 /* The link state is latched low so that momentary link 2162 * drops can be detected. Do not double-read the status 2163 * in polling mode to detect such short link drops except 2164 * the link was already down. 2165 */ 2166 if (!phy_polling_mode(phydev) || !phydev->link) { 2167 status = phy_read(phydev, MII_BMSR); 2168 if (status < 0) 2169 return status; 2170 else if (status & BMSR_LSTATUS) 2171 goto done; 2172 } 2173 2174 /* Read link and autonegotiation status */ 2175 status = phy_read(phydev, MII_BMSR); 2176 if (status < 0) 2177 return status; 2178 done: 2179 phydev->link = status & BMSR_LSTATUS ? 1 : 0; 2180 phydev->autoneg_complete = status & BMSR_ANEGCOMPLETE ? 1 : 0; 2181 2182 /* Consider the case that autoneg was started and "aneg complete" 2183 * bit has been reset, but "link up" bit not yet. 2184 */ 2185 if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete) 2186 phydev->link = 0; 2187 2188 return 0; 2189 } 2190 EXPORT_SYMBOL(genphy_update_link); 2191 2192 int genphy_read_lpa(struct phy_device *phydev) 2193 { 2194 int lpa, lpagb; 2195 2196 if (phydev->autoneg == AUTONEG_ENABLE) { 2197 if (!phydev->autoneg_complete) { 2198 mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, 2199 0); 2200 mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0); 2201 return 0; 2202 } 2203 2204 if (phydev->is_gigabit_capable) { 2205 lpagb = phy_read(phydev, MII_STAT1000); 2206 if (lpagb < 0) 2207 return lpagb; 2208 2209 if (lpagb & LPA_1000MSFAIL) { 2210 int adv = phy_read(phydev, MII_CTRL1000); 2211 2212 if (adv < 0) 2213 return adv; 2214 2215 if (adv & CTL1000_ENABLE_MASTER) 2216 phydev_err(phydev, "Master/Slave resolution failed, maybe conflicting manual settings?\n"); 2217 else 2218 phydev_err(phydev, "Master/Slave resolution failed\n"); 2219 return -ENOLINK; 2220 } 2221 2222 mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, 2223 lpagb); 2224 } 2225 2226 lpa = phy_read(phydev, MII_LPA); 2227 if (lpa < 0) 2228 return lpa; 2229 2230 mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa); 2231 } else { 2232 linkmode_zero(phydev->lp_advertising); 2233 } 2234 2235 return 0; 2236 } 2237 EXPORT_SYMBOL(genphy_read_lpa); 2238 2239 /** 2240 * genphy_read_status_fixed - read the link parameters for !aneg mode 2241 * @phydev: target phy_device struct 2242 * 2243 * Read the current duplex and speed state for a PHY operating with 2244 * autonegotiation disabled. 2245 */ 2246 int genphy_read_status_fixed(struct phy_device *phydev) 2247 { 2248 int bmcr = phy_read(phydev, MII_BMCR); 2249 2250 if (bmcr < 0) 2251 return bmcr; 2252 2253 if (bmcr & BMCR_FULLDPLX) 2254 phydev->duplex = DUPLEX_FULL; 2255 else 2256 phydev->duplex = DUPLEX_HALF; 2257 2258 if (bmcr & BMCR_SPEED1000) 2259 phydev->speed = SPEED_1000; 2260 else if (bmcr & BMCR_SPEED100) 2261 phydev->speed = SPEED_100; 2262 else 2263 phydev->speed = SPEED_10; 2264 2265 return 0; 2266 } 2267 EXPORT_SYMBOL(genphy_read_status_fixed); 2268 2269 /** 2270 * genphy_read_status - check the link status and update current link state 2271 * @phydev: target phy_device struct 2272 * 2273 * Description: Check the link, then figure out the current state 2274 * by comparing what we advertise with what the link partner 2275 * advertises. Start by checking the gigabit possibilities, 2276 * then move on to 10/100. 2277 */ 2278 int genphy_read_status(struct phy_device *phydev) 2279 { 2280 int err, old_link = phydev->link; 2281 2282 /* Update the link, but return if there was an error */ 2283 err = genphy_update_link(phydev); 2284 if (err) 2285 return err; 2286 2287 /* why bother the PHY if nothing can have changed */ 2288 if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link) 2289 return 0; 2290 2291 phydev->speed = SPEED_UNKNOWN; 2292 phydev->duplex = DUPLEX_UNKNOWN; 2293 phydev->pause = 0; 2294 phydev->asym_pause = 0; 2295 2296 err = genphy_read_master_slave(phydev); 2297 if (err < 0) 2298 return err; 2299 2300 err = genphy_read_lpa(phydev); 2301 if (err < 0) 2302 return err; 2303 2304 if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) { 2305 phy_resolve_aneg_linkmode(phydev); 2306 } else if (phydev->autoneg == AUTONEG_DISABLE) { 2307 err = genphy_read_status_fixed(phydev); 2308 if (err < 0) 2309 return err; 2310 } 2311 2312 return 0; 2313 } 2314 EXPORT_SYMBOL(genphy_read_status); 2315 2316 /** 2317 * genphy_c37_read_status - check the link status and update current link state 2318 * @phydev: target phy_device struct 2319 * 2320 * Description: Check the link, then figure out the current state 2321 * by comparing what we advertise with what the link partner 2322 * advertises. This function is for Clause 37 1000Base-X mode. 2323 */ 2324 int genphy_c37_read_status(struct phy_device *phydev) 2325 { 2326 int lpa, err, old_link = phydev->link; 2327 2328 /* Update the link, but return if there was an error */ 2329 err = genphy_update_link(phydev); 2330 if (err) 2331 return err; 2332 2333 /* why bother the PHY if nothing can have changed */ 2334 if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link) 2335 return 0; 2336 2337 phydev->duplex = DUPLEX_UNKNOWN; 2338 phydev->pause = 0; 2339 phydev->asym_pause = 0; 2340 2341 if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) { 2342 lpa = phy_read(phydev, MII_LPA); 2343 if (lpa < 0) 2344 return lpa; 2345 2346 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, 2347 phydev->lp_advertising, lpa & LPA_LPACK); 2348 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 2349 phydev->lp_advertising, lpa & LPA_1000XFULL); 2350 linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2351 phydev->lp_advertising, lpa & LPA_1000XPAUSE); 2352 linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2353 phydev->lp_advertising, 2354 lpa & LPA_1000XPAUSE_ASYM); 2355 2356 phy_resolve_aneg_linkmode(phydev); 2357 } else if (phydev->autoneg == AUTONEG_DISABLE) { 2358 int bmcr = phy_read(phydev, MII_BMCR); 2359 2360 if (bmcr < 0) 2361 return bmcr; 2362 2363 if (bmcr & BMCR_FULLDPLX) 2364 phydev->duplex = DUPLEX_FULL; 2365 else 2366 phydev->duplex = DUPLEX_HALF; 2367 } 2368 2369 return 0; 2370 } 2371 EXPORT_SYMBOL(genphy_c37_read_status); 2372 2373 /** 2374 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 2375 * @phydev: target phy_device struct 2376 * 2377 * Description: Perform a software PHY reset using the standard 2378 * BMCR_RESET bit and poll for the reset bit to be cleared. 2379 * 2380 * Returns: 0 on success, < 0 on failure 2381 */ 2382 int genphy_soft_reset(struct phy_device *phydev) 2383 { 2384 u16 res = BMCR_RESET; 2385 int ret; 2386 2387 if (phydev->autoneg == AUTONEG_ENABLE) 2388 res |= BMCR_ANRESTART; 2389 2390 ret = phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, res); 2391 if (ret < 0) 2392 return ret; 2393 2394 /* Clause 22 states that setting bit BMCR_RESET sets control registers 2395 * to their default value. Therefore the POWER DOWN bit is supposed to 2396 * be cleared after soft reset. 2397 */ 2398 phydev->suspended = 0; 2399 2400 ret = phy_poll_reset(phydev); 2401 if (ret) 2402 return ret; 2403 2404 /* BMCR may be reset to defaults */ 2405 if (phydev->autoneg == AUTONEG_DISABLE) 2406 ret = genphy_setup_forced(phydev); 2407 2408 return ret; 2409 } 2410 EXPORT_SYMBOL(genphy_soft_reset); 2411 2412 /** 2413 * genphy_read_abilities - read PHY abilities from Clause 22 registers 2414 * @phydev: target phy_device struct 2415 * 2416 * Description: Reads the PHY's abilities and populates 2417 * phydev->supported accordingly. 2418 * 2419 * Returns: 0 on success, < 0 on failure 2420 */ 2421 int genphy_read_abilities(struct phy_device *phydev) 2422 { 2423 int val; 2424 2425 linkmode_set_bit_array(phy_basic_ports_array, 2426 ARRAY_SIZE(phy_basic_ports_array), 2427 phydev->supported); 2428 2429 val = phy_read(phydev, MII_BMSR); 2430 if (val < 0) 2431 return val; 2432 2433 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported, 2434 val & BMSR_ANEGCAPABLE); 2435 2436 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported, 2437 val & BMSR_100FULL); 2438 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, phydev->supported, 2439 val & BMSR_100HALF); 2440 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, phydev->supported, 2441 val & BMSR_10FULL); 2442 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, phydev->supported, 2443 val & BMSR_10HALF); 2444 2445 if (val & BMSR_ESTATEN) { 2446 val = phy_read(phydev, MII_ESTATUS); 2447 if (val < 0) 2448 return val; 2449 2450 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 2451 phydev->supported, val & ESTATUS_1000_TFULL); 2452 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, 2453 phydev->supported, val & ESTATUS_1000_THALF); 2454 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 2455 phydev->supported, val & ESTATUS_1000_XFULL); 2456 } 2457 2458 return 0; 2459 } 2460 EXPORT_SYMBOL(genphy_read_abilities); 2461 2462 /* This is used for the phy device which doesn't support the MMD extended 2463 * register access, but it does have side effect when we are trying to access 2464 * the MMD register via indirect method. 2465 */ 2466 int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum) 2467 { 2468 return -EOPNOTSUPP; 2469 } 2470 EXPORT_SYMBOL(genphy_read_mmd_unsupported); 2471 2472 int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum, 2473 u16 regnum, u16 val) 2474 { 2475 return -EOPNOTSUPP; 2476 } 2477 EXPORT_SYMBOL(genphy_write_mmd_unsupported); 2478 2479 int genphy_suspend(struct phy_device *phydev) 2480 { 2481 return phy_set_bits(phydev, MII_BMCR, BMCR_PDOWN); 2482 } 2483 EXPORT_SYMBOL(genphy_suspend); 2484 2485 int genphy_resume(struct phy_device *phydev) 2486 { 2487 return phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN); 2488 } 2489 EXPORT_SYMBOL(genphy_resume); 2490 2491 int genphy_loopback(struct phy_device *phydev, bool enable) 2492 { 2493 return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 2494 enable ? BMCR_LOOPBACK : 0); 2495 } 2496 EXPORT_SYMBOL(genphy_loopback); 2497 2498 /** 2499 * phy_remove_link_mode - Remove a supported link mode 2500 * @phydev: phy_device structure to remove link mode from 2501 * @link_mode: Link mode to be removed 2502 * 2503 * Description: Some MACs don't support all link modes which the PHY 2504 * does. e.g. a 1G MAC often does not support 1000Half. Add a helper 2505 * to remove a link mode. 2506 */ 2507 void phy_remove_link_mode(struct phy_device *phydev, u32 link_mode) 2508 { 2509 linkmode_clear_bit(link_mode, phydev->supported); 2510 phy_advertise_supported(phydev); 2511 } 2512 EXPORT_SYMBOL(phy_remove_link_mode); 2513 2514 static void phy_copy_pause_bits(unsigned long *dst, unsigned long *src) 2515 { 2516 linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, dst, 2517 linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, src)); 2518 linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, dst, 2519 linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, src)); 2520 } 2521 2522 /** 2523 * phy_advertise_supported - Advertise all supported modes 2524 * @phydev: target phy_device struct 2525 * 2526 * Description: Called to advertise all supported modes, doesn't touch 2527 * pause mode advertising. 2528 */ 2529 void phy_advertise_supported(struct phy_device *phydev) 2530 { 2531 __ETHTOOL_DECLARE_LINK_MODE_MASK(new); 2532 2533 linkmode_copy(new, phydev->supported); 2534 phy_copy_pause_bits(new, phydev->advertising); 2535 linkmode_copy(phydev->advertising, new); 2536 } 2537 EXPORT_SYMBOL(phy_advertise_supported); 2538 2539 /** 2540 * phy_support_sym_pause - Enable support of symmetrical pause 2541 * @phydev: target phy_device struct 2542 * 2543 * Description: Called by the MAC to indicate is supports symmetrical 2544 * Pause, but not asym pause. 2545 */ 2546 void phy_support_sym_pause(struct phy_device *phydev) 2547 { 2548 linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported); 2549 phy_copy_pause_bits(phydev->advertising, phydev->supported); 2550 } 2551 EXPORT_SYMBOL(phy_support_sym_pause); 2552 2553 /** 2554 * phy_support_asym_pause - Enable support of asym pause 2555 * @phydev: target phy_device struct 2556 * 2557 * Description: Called by the MAC to indicate is supports Asym Pause. 2558 */ 2559 void phy_support_asym_pause(struct phy_device *phydev) 2560 { 2561 phy_copy_pause_bits(phydev->advertising, phydev->supported); 2562 } 2563 EXPORT_SYMBOL(phy_support_asym_pause); 2564 2565 /** 2566 * phy_set_sym_pause - Configure symmetric Pause 2567 * @phydev: target phy_device struct 2568 * @rx: Receiver Pause is supported 2569 * @tx: Transmit Pause is supported 2570 * @autoneg: Auto neg should be used 2571 * 2572 * Description: Configure advertised Pause support depending on if 2573 * receiver pause and pause auto neg is supported. Generally called 2574 * from the set_pauseparam .ndo. 2575 */ 2576 void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx, 2577 bool autoneg) 2578 { 2579 linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported); 2580 2581 if (rx && tx && autoneg) 2582 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2583 phydev->supported); 2584 2585 linkmode_copy(phydev->advertising, phydev->supported); 2586 } 2587 EXPORT_SYMBOL(phy_set_sym_pause); 2588 2589 /** 2590 * phy_set_asym_pause - Configure Pause and Asym Pause 2591 * @phydev: target phy_device struct 2592 * @rx: Receiver Pause is supported 2593 * @tx: Transmit Pause is supported 2594 * 2595 * Description: Configure advertised Pause support depending on if 2596 * transmit and receiver pause is supported. If there has been a 2597 * change in adverting, trigger a new autoneg. Generally called from 2598 * the set_pauseparam .ndo. 2599 */ 2600 void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx) 2601 { 2602 __ETHTOOL_DECLARE_LINK_MODE_MASK(oldadv); 2603 2604 linkmode_copy(oldadv, phydev->advertising); 2605 linkmode_set_pause(phydev->advertising, tx, rx); 2606 2607 if (!linkmode_equal(oldadv, phydev->advertising) && 2608 phydev->autoneg) 2609 phy_start_aneg(phydev); 2610 } 2611 EXPORT_SYMBOL(phy_set_asym_pause); 2612 2613 /** 2614 * phy_validate_pause - Test if the PHY/MAC support the pause configuration 2615 * @phydev: phy_device struct 2616 * @pp: requested pause configuration 2617 * 2618 * Description: Test if the PHY/MAC combination supports the Pause 2619 * configuration the user is requesting. Returns True if it is 2620 * supported, false otherwise. 2621 */ 2622 bool phy_validate_pause(struct phy_device *phydev, 2623 struct ethtool_pauseparam *pp) 2624 { 2625 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2626 phydev->supported) && pp->rx_pause) 2627 return false; 2628 2629 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2630 phydev->supported) && 2631 pp->rx_pause != pp->tx_pause) 2632 return false; 2633 2634 return true; 2635 } 2636 EXPORT_SYMBOL(phy_validate_pause); 2637 2638 /** 2639 * phy_get_pause - resolve negotiated pause modes 2640 * @phydev: phy_device struct 2641 * @tx_pause: pointer to bool to indicate whether transmit pause should be 2642 * enabled. 2643 * @rx_pause: pointer to bool to indicate whether receive pause should be 2644 * enabled. 2645 * 2646 * Resolve and return the flow control modes according to the negotiation 2647 * result. This includes checking that we are operating in full duplex mode. 2648 * See linkmode_resolve_pause() for further details. 2649 */ 2650 void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause) 2651 { 2652 if (phydev->duplex != DUPLEX_FULL) { 2653 *tx_pause = false; 2654 *rx_pause = false; 2655 return; 2656 } 2657 2658 return linkmode_resolve_pause(phydev->advertising, 2659 phydev->lp_advertising, 2660 tx_pause, rx_pause); 2661 } 2662 EXPORT_SYMBOL(phy_get_pause); 2663 2664 static bool phy_drv_supports_irq(struct phy_driver *phydrv) 2665 { 2666 return phydrv->config_intr && phydrv->ack_interrupt; 2667 } 2668 2669 /** 2670 * phy_probe - probe and init a PHY device 2671 * @dev: device to probe and init 2672 * 2673 * Description: Take care of setting up the phy_device structure, 2674 * set the state to READY (the driver's init function should 2675 * set it to STARTING if needed). 2676 */ 2677 static int phy_probe(struct device *dev) 2678 { 2679 struct phy_device *phydev = to_phy_device(dev); 2680 struct device_driver *drv = phydev->mdio.dev.driver; 2681 struct phy_driver *phydrv = to_phy_driver(drv); 2682 int err = 0; 2683 2684 phydev->drv = phydrv; 2685 2686 /* Disable the interrupt if the PHY doesn't support it 2687 * but the interrupt is still a valid one 2688 */ 2689 if (!phy_drv_supports_irq(phydrv) && phy_interrupt_is_valid(phydev)) 2690 phydev->irq = PHY_POLL; 2691 2692 if (phydrv->flags & PHY_IS_INTERNAL) 2693 phydev->is_internal = true; 2694 2695 mutex_lock(&phydev->lock); 2696 2697 if (phydev->drv->probe) { 2698 /* Deassert the reset signal */ 2699 phy_device_reset(phydev, 0); 2700 2701 err = phydev->drv->probe(phydev); 2702 if (err) { 2703 /* Assert the reset signal */ 2704 phy_device_reset(phydev, 1); 2705 goto out; 2706 } 2707 } 2708 2709 /* Start out supporting everything. Eventually, 2710 * a controller will attach, and may modify one 2711 * or both of these values 2712 */ 2713 if (phydrv->features) { 2714 linkmode_copy(phydev->supported, phydrv->features); 2715 } else if (phydrv->get_features) { 2716 err = phydrv->get_features(phydev); 2717 } else if (phydev->is_c45) { 2718 err = genphy_c45_pma_read_abilities(phydev); 2719 } else { 2720 err = genphy_read_abilities(phydev); 2721 } 2722 2723 if (err) 2724 goto out; 2725 2726 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, 2727 phydev->supported)) 2728 phydev->autoneg = 0; 2729 2730 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, 2731 phydev->supported)) 2732 phydev->is_gigabit_capable = 1; 2733 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 2734 phydev->supported)) 2735 phydev->is_gigabit_capable = 1; 2736 2737 of_set_phy_supported(phydev); 2738 phy_advertise_supported(phydev); 2739 2740 /* Get the EEE modes we want to prohibit. We will ask 2741 * the PHY stop advertising these mode later on 2742 */ 2743 of_set_phy_eee_broken(phydev); 2744 2745 /* The Pause Frame bits indicate that the PHY can support passing 2746 * pause frames. During autonegotiation, the PHYs will determine if 2747 * they should allow pause frames to pass. The MAC driver should then 2748 * use that result to determine whether to enable flow control via 2749 * pause frames. 2750 * 2751 * Normally, PHY drivers should not set the Pause bits, and instead 2752 * allow phylib to do that. However, there may be some situations 2753 * (e.g. hardware erratum) where the driver wants to set only one 2754 * of these bits. 2755 */ 2756 if (!test_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported) && 2757 !test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported)) { 2758 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2759 phydev->supported); 2760 linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2761 phydev->supported); 2762 } 2763 2764 /* Set the state to READY by default */ 2765 phydev->state = PHY_READY; 2766 2767 out: 2768 mutex_unlock(&phydev->lock); 2769 2770 return err; 2771 } 2772 2773 static int phy_remove(struct device *dev) 2774 { 2775 struct phy_device *phydev = to_phy_device(dev); 2776 2777 cancel_delayed_work_sync(&phydev->state_queue); 2778 2779 mutex_lock(&phydev->lock); 2780 phydev->state = PHY_DOWN; 2781 mutex_unlock(&phydev->lock); 2782 2783 sfp_bus_del_upstream(phydev->sfp_bus); 2784 phydev->sfp_bus = NULL; 2785 2786 if (phydev->drv && phydev->drv->remove) { 2787 phydev->drv->remove(phydev); 2788 2789 /* Assert the reset signal */ 2790 phy_device_reset(phydev, 1); 2791 } 2792 phydev->drv = NULL; 2793 2794 return 0; 2795 } 2796 2797 /** 2798 * phy_driver_register - register a phy_driver with the PHY layer 2799 * @new_driver: new phy_driver to register 2800 * @owner: module owning this PHY 2801 */ 2802 int phy_driver_register(struct phy_driver *new_driver, struct module *owner) 2803 { 2804 int retval; 2805 2806 /* Either the features are hard coded, or dynamically 2807 * determined. It cannot be both. 2808 */ 2809 if (WARN_ON(new_driver->features && new_driver->get_features)) { 2810 pr_err("%s: features and get_features must not both be set\n", 2811 new_driver->name); 2812 return -EINVAL; 2813 } 2814 2815 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; 2816 new_driver->mdiodrv.driver.name = new_driver->name; 2817 new_driver->mdiodrv.driver.bus = &mdio_bus_type; 2818 new_driver->mdiodrv.driver.probe = phy_probe; 2819 new_driver->mdiodrv.driver.remove = phy_remove; 2820 new_driver->mdiodrv.driver.owner = owner; 2821 new_driver->mdiodrv.driver.probe_type = PROBE_FORCE_SYNCHRONOUS; 2822 2823 retval = driver_register(&new_driver->mdiodrv.driver); 2824 if (retval) { 2825 pr_err("%s: Error %d in registering driver\n", 2826 new_driver->name, retval); 2827 2828 return retval; 2829 } 2830 2831 pr_debug("%s: Registered new driver\n", new_driver->name); 2832 2833 return 0; 2834 } 2835 EXPORT_SYMBOL(phy_driver_register); 2836 2837 int phy_drivers_register(struct phy_driver *new_driver, int n, 2838 struct module *owner) 2839 { 2840 int i, ret = 0; 2841 2842 for (i = 0; i < n; i++) { 2843 ret = phy_driver_register(new_driver + i, owner); 2844 if (ret) { 2845 while (i-- > 0) 2846 phy_driver_unregister(new_driver + i); 2847 break; 2848 } 2849 } 2850 return ret; 2851 } 2852 EXPORT_SYMBOL(phy_drivers_register); 2853 2854 void phy_driver_unregister(struct phy_driver *drv) 2855 { 2856 driver_unregister(&drv->mdiodrv.driver); 2857 } 2858 EXPORT_SYMBOL(phy_driver_unregister); 2859 2860 void phy_drivers_unregister(struct phy_driver *drv, int n) 2861 { 2862 int i; 2863 2864 for (i = 0; i < n; i++) 2865 phy_driver_unregister(drv + i); 2866 } 2867 EXPORT_SYMBOL(phy_drivers_unregister); 2868 2869 static struct phy_driver genphy_driver = { 2870 .phy_id = 0xffffffff, 2871 .phy_id_mask = 0xffffffff, 2872 .name = "Generic PHY", 2873 .get_features = genphy_read_abilities, 2874 .suspend = genphy_suspend, 2875 .resume = genphy_resume, 2876 .set_loopback = genphy_loopback, 2877 }; 2878 2879 static int __init phy_init(void) 2880 { 2881 int rc; 2882 2883 rc = mdio_bus_init(); 2884 if (rc) 2885 return rc; 2886 2887 features_init(); 2888 2889 rc = phy_driver_register(&genphy_c45_driver, THIS_MODULE); 2890 if (rc) 2891 goto err_c45; 2892 2893 rc = phy_driver_register(&genphy_driver, THIS_MODULE); 2894 if (rc) { 2895 phy_driver_unregister(&genphy_c45_driver); 2896 err_c45: 2897 mdio_bus_exit(); 2898 } 2899 2900 return rc; 2901 } 2902 2903 static void __exit phy_exit(void) 2904 { 2905 phy_driver_unregister(&genphy_c45_driver); 2906 phy_driver_unregister(&genphy_driver); 2907 mdio_bus_exit(); 2908 } 2909 2910 subsys_initcall(phy_init); 2911 module_exit(phy_exit); 2912