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; 679 680 phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS2); 681 if (phy_reg < 0) 682 return -EIO; 683 *devices_in_package = phy_reg << 16; 684 685 phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS1); 686 if (phy_reg < 0) 687 return -EIO; 688 *devices_in_package |= phy_reg; 689 690 /* Bit 0 doesn't represent a device, it indicates c22 regs presence */ 691 *devices_in_package &= ~BIT(0); 692 693 return 0; 694 } 695 696 /** 697 * get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs. 698 * @bus: the target MII bus 699 * @addr: PHY address on the MII bus 700 * @phy_id: where to store the ID retrieved. 701 * @c45_ids: where to store the c45 ID information. 702 * 703 * If the PHY devices-in-package appears to be valid, it and the 704 * corresponding identifiers are stored in @c45_ids, zero is stored 705 * in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns 706 * zero on success. 707 * 708 */ 709 static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id, 710 struct phy_c45_device_ids *c45_ids) 711 { 712 const int num_ids = ARRAY_SIZE(c45_ids->device_ids); 713 u32 *devs = &c45_ids->devices_in_package; 714 int i, phy_reg; 715 716 /* Find first non-zero Devices In package. Device zero is reserved 717 * for 802.3 c45 complied PHYs, so don't probe it at first. 718 */ 719 for (i = 1; i < num_ids && *devs == 0; i++) { 720 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs); 721 if (phy_reg < 0) 722 return -EIO; 723 724 if ((*devs & 0x1fffffff) == 0x1fffffff) { 725 /* If mostly Fs, there is no device there, 726 * then let's continue to probe more, as some 727 * 10G PHYs have zero Devices In package, 728 * e.g. Cortina CS4315/CS4340 PHY. 729 */ 730 phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, devs); 731 if (phy_reg < 0) 732 return -EIO; 733 /* no device there, let's get out of here */ 734 if ((*devs & 0x1fffffff) == 0x1fffffff) { 735 *phy_id = 0xffffffff; 736 return 0; 737 } else { 738 break; 739 } 740 } 741 } 742 743 /* Now probe Device Identifiers for each device present. */ 744 for (i = 1; i < num_ids; i++) { 745 if (!(c45_ids->devices_in_package & (1 << i))) 746 continue; 747 748 phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID1); 749 if (phy_reg < 0) 750 return -EIO; 751 c45_ids->device_ids[i] = phy_reg << 16; 752 753 phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID2); 754 if (phy_reg < 0) 755 return -EIO; 756 c45_ids->device_ids[i] |= phy_reg; 757 } 758 *phy_id = 0; 759 return 0; 760 } 761 762 /** 763 * get_phy_id - reads the specified addr for its ID. 764 * @bus: the target MII bus 765 * @addr: PHY address on the MII bus 766 * @phy_id: where to store the ID retrieved. 767 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 768 * @c45_ids: where to store the c45 ID information. 769 * 770 * Description: In the case of a 802.3-c22 PHY, reads the ID registers 771 * of the PHY at @addr on the @bus, stores it in @phy_id and returns 772 * zero on success. 773 * 774 * In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and 775 * its return value is in turn returned. 776 * 777 */ 778 static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id, 779 bool is_c45, struct phy_c45_device_ids *c45_ids) 780 { 781 int phy_reg; 782 783 if (is_c45) 784 return get_phy_c45_ids(bus, addr, phy_id, c45_ids); 785 786 /* Grab the bits from PHYIR1, and put them in the upper half */ 787 phy_reg = mdiobus_read(bus, addr, MII_PHYSID1); 788 if (phy_reg < 0) { 789 /* returning -ENODEV doesn't stop bus scanning */ 790 return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO; 791 } 792 793 *phy_id = phy_reg << 16; 794 795 /* Grab the bits from PHYIR2, and put them in the lower half */ 796 phy_reg = mdiobus_read(bus, addr, MII_PHYSID2); 797 if (phy_reg < 0) { 798 /* returning -ENODEV doesn't stop bus scanning */ 799 return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO; 800 } 801 802 *phy_id |= phy_reg; 803 804 return 0; 805 } 806 807 /** 808 * get_phy_device - reads the specified PHY device and returns its @phy_device 809 * struct 810 * @bus: the target MII bus 811 * @addr: PHY address on the MII bus 812 * @is_c45: If true the PHY uses the 802.3 clause 45 protocol 813 * 814 * Description: Reads the ID registers of the PHY at @addr on the 815 * @bus, then allocates and returns the phy_device to represent it. 816 */ 817 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45) 818 { 819 struct phy_c45_device_ids c45_ids; 820 u32 phy_id = 0; 821 int r; 822 823 c45_ids.devices_in_package = 0; 824 memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids)); 825 826 r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids); 827 if (r) 828 return ERR_PTR(r); 829 830 /* If the phy_id is mostly Fs, there is no device there */ 831 if ((phy_id & 0x1fffffff) == 0x1fffffff) 832 return ERR_PTR(-ENODEV); 833 834 return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids); 835 } 836 EXPORT_SYMBOL(get_phy_device); 837 838 /** 839 * phy_device_register - Register the phy device on the MDIO bus 840 * @phydev: phy_device structure to be added to the MDIO bus 841 */ 842 int phy_device_register(struct phy_device *phydev) 843 { 844 int err; 845 846 err = mdiobus_register_device(&phydev->mdio); 847 if (err) 848 return err; 849 850 /* Deassert the reset signal */ 851 phy_device_reset(phydev, 0); 852 853 /* Run all of the fixups for this PHY */ 854 err = phy_scan_fixups(phydev); 855 if (err) { 856 phydev_err(phydev, "failed to initialize\n"); 857 goto out; 858 } 859 860 err = device_add(&phydev->mdio.dev); 861 if (err) { 862 phydev_err(phydev, "failed to add\n"); 863 goto out; 864 } 865 866 return 0; 867 868 out: 869 /* Assert the reset signal */ 870 phy_device_reset(phydev, 1); 871 872 mdiobus_unregister_device(&phydev->mdio); 873 return err; 874 } 875 EXPORT_SYMBOL(phy_device_register); 876 877 /** 878 * phy_device_remove - Remove a previously registered phy device from the MDIO bus 879 * @phydev: phy_device structure to remove 880 * 881 * This doesn't free the phy_device itself, it merely reverses the effects 882 * of phy_device_register(). Use phy_device_free() to free the device 883 * after calling this function. 884 */ 885 void phy_device_remove(struct phy_device *phydev) 886 { 887 if (phydev->mii_ts) 888 unregister_mii_timestamper(phydev->mii_ts); 889 890 device_del(&phydev->mdio.dev); 891 892 /* Assert the reset signal */ 893 phy_device_reset(phydev, 1); 894 895 mdiobus_unregister_device(&phydev->mdio); 896 } 897 EXPORT_SYMBOL(phy_device_remove); 898 899 /** 900 * phy_find_first - finds the first PHY device on the bus 901 * @bus: the target MII bus 902 */ 903 struct phy_device *phy_find_first(struct mii_bus *bus) 904 { 905 struct phy_device *phydev; 906 int addr; 907 908 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 909 phydev = mdiobus_get_phy(bus, addr); 910 if (phydev) 911 return phydev; 912 } 913 return NULL; 914 } 915 EXPORT_SYMBOL(phy_find_first); 916 917 static void phy_link_change(struct phy_device *phydev, bool up) 918 { 919 struct net_device *netdev = phydev->attached_dev; 920 921 if (up) 922 netif_carrier_on(netdev); 923 else 924 netif_carrier_off(netdev); 925 phydev->adjust_link(netdev); 926 if (phydev->mii_ts && phydev->mii_ts->link_state) 927 phydev->mii_ts->link_state(phydev->mii_ts, phydev); 928 } 929 930 /** 931 * phy_prepare_link - prepares the PHY layer to monitor link status 932 * @phydev: target phy_device struct 933 * @handler: callback function for link status change notifications 934 * 935 * Description: Tells the PHY infrastructure to handle the 936 * gory details on monitoring link status (whether through 937 * polling or an interrupt), and to call back to the 938 * connected device driver when the link status changes. 939 * If you want to monitor your own link state, don't call 940 * this function. 941 */ 942 static void phy_prepare_link(struct phy_device *phydev, 943 void (*handler)(struct net_device *)) 944 { 945 phydev->adjust_link = handler; 946 } 947 948 /** 949 * phy_connect_direct - connect an ethernet device to a specific phy_device 950 * @dev: the network device to connect 951 * @phydev: the pointer to the phy device 952 * @handler: callback function for state change notifications 953 * @interface: PHY device's interface 954 */ 955 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev, 956 void (*handler)(struct net_device *), 957 phy_interface_t interface) 958 { 959 int rc; 960 961 if (!dev) 962 return -EINVAL; 963 964 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 965 if (rc) 966 return rc; 967 968 phy_prepare_link(phydev, handler); 969 if (phy_interrupt_is_valid(phydev)) 970 phy_request_interrupt(phydev); 971 972 return 0; 973 } 974 EXPORT_SYMBOL(phy_connect_direct); 975 976 /** 977 * phy_connect - connect an ethernet device to a PHY device 978 * @dev: the network device to connect 979 * @bus_id: the id string of the PHY device to connect 980 * @handler: callback function for state change notifications 981 * @interface: PHY device's interface 982 * 983 * Description: Convenience function for connecting ethernet 984 * devices to PHY devices. The default behavior is for 985 * the PHY infrastructure to handle everything, and only notify 986 * the connected driver when the link status changes. If you 987 * don't want, or can't use the provided functionality, you may 988 * choose to call only the subset of functions which provide 989 * the desired functionality. 990 */ 991 struct phy_device *phy_connect(struct net_device *dev, const char *bus_id, 992 void (*handler)(struct net_device *), 993 phy_interface_t interface) 994 { 995 struct phy_device *phydev; 996 struct device *d; 997 int rc; 998 999 /* Search the list of PHY devices on the mdio bus for the 1000 * PHY with the requested name 1001 */ 1002 d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id); 1003 if (!d) { 1004 pr_err("PHY %s not found\n", bus_id); 1005 return ERR_PTR(-ENODEV); 1006 } 1007 phydev = to_phy_device(d); 1008 1009 rc = phy_connect_direct(dev, phydev, handler, interface); 1010 put_device(d); 1011 if (rc) 1012 return ERR_PTR(rc); 1013 1014 return phydev; 1015 } 1016 EXPORT_SYMBOL(phy_connect); 1017 1018 /** 1019 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY 1020 * device 1021 * @phydev: target phy_device struct 1022 */ 1023 void phy_disconnect(struct phy_device *phydev) 1024 { 1025 if (phy_is_started(phydev)) 1026 phy_stop(phydev); 1027 1028 if (phy_interrupt_is_valid(phydev)) 1029 phy_free_interrupt(phydev); 1030 1031 phydev->adjust_link = NULL; 1032 1033 phy_detach(phydev); 1034 } 1035 EXPORT_SYMBOL(phy_disconnect); 1036 1037 /** 1038 * phy_poll_reset - Safely wait until a PHY reset has properly completed 1039 * @phydev: The PHY device to poll 1040 * 1041 * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as 1042 * published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR 1043 * register must be polled until the BMCR_RESET bit clears. 1044 * 1045 * Furthermore, any attempts to write to PHY registers may have no effect 1046 * or even generate MDIO bus errors until this is complete. 1047 * 1048 * Some PHYs (such as the Marvell 88E1111) don't entirely conform to the 1049 * standard and do not fully reset after the BMCR_RESET bit is set, and may 1050 * even *REQUIRE* a soft-reset to properly restart autonegotiation. In an 1051 * effort to support such broken PHYs, this function is separate from the 1052 * standard phy_init_hw() which will zero all the other bits in the BMCR 1053 * and reapply all driver-specific and board-specific fixups. 1054 */ 1055 static int phy_poll_reset(struct phy_device *phydev) 1056 { 1057 /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ 1058 int ret, val; 1059 1060 ret = phy_read_poll_timeout(phydev, MII_BMCR, val, !(val & BMCR_RESET), 1061 50000, 600000, true); 1062 if (ret) 1063 return ret; 1064 /* Some chips (smsc911x) may still need up to another 1ms after the 1065 * BMCR_RESET bit is cleared before they are usable. 1066 */ 1067 msleep(1); 1068 return 0; 1069 } 1070 1071 int phy_init_hw(struct phy_device *phydev) 1072 { 1073 int ret = 0; 1074 1075 /* Deassert the reset signal */ 1076 phy_device_reset(phydev, 0); 1077 1078 if (!phydev->drv) 1079 return 0; 1080 1081 if (phydev->drv->soft_reset) { 1082 ret = phydev->drv->soft_reset(phydev); 1083 /* see comment in genphy_soft_reset for an explanation */ 1084 if (!ret) 1085 phydev->suspended = 0; 1086 } 1087 1088 if (ret < 0) 1089 return ret; 1090 1091 ret = phy_scan_fixups(phydev); 1092 if (ret < 0) 1093 return ret; 1094 1095 if (phydev->drv->config_init) 1096 ret = phydev->drv->config_init(phydev); 1097 1098 return ret; 1099 } 1100 EXPORT_SYMBOL(phy_init_hw); 1101 1102 void phy_attached_info(struct phy_device *phydev) 1103 { 1104 phy_attached_print(phydev, NULL); 1105 } 1106 EXPORT_SYMBOL(phy_attached_info); 1107 1108 #define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%s)" 1109 char *phy_attached_info_irq(struct phy_device *phydev) 1110 { 1111 char *irq_str; 1112 char irq_num[8]; 1113 1114 switch(phydev->irq) { 1115 case PHY_POLL: 1116 irq_str = "POLL"; 1117 break; 1118 case PHY_IGNORE_INTERRUPT: 1119 irq_str = "IGNORE"; 1120 break; 1121 default: 1122 snprintf(irq_num, sizeof(irq_num), "%d", phydev->irq); 1123 irq_str = irq_num; 1124 break; 1125 } 1126 1127 return kasprintf(GFP_KERNEL, "%s", irq_str); 1128 } 1129 EXPORT_SYMBOL(phy_attached_info_irq); 1130 1131 void phy_attached_print(struct phy_device *phydev, const char *fmt, ...) 1132 { 1133 const char *drv_name = phydev->drv ? phydev->drv->name : "unbound"; 1134 char *irq_str = phy_attached_info_irq(phydev); 1135 1136 if (!fmt) { 1137 phydev_info(phydev, ATTACHED_FMT "\n", 1138 drv_name, phydev_name(phydev), 1139 irq_str); 1140 } else { 1141 va_list ap; 1142 1143 phydev_info(phydev, ATTACHED_FMT, 1144 drv_name, phydev_name(phydev), 1145 irq_str); 1146 1147 va_start(ap, fmt); 1148 vprintk(fmt, ap); 1149 va_end(ap); 1150 } 1151 kfree(irq_str); 1152 } 1153 EXPORT_SYMBOL(phy_attached_print); 1154 1155 static void phy_sysfs_create_links(struct phy_device *phydev) 1156 { 1157 struct net_device *dev = phydev->attached_dev; 1158 int err; 1159 1160 if (!dev) 1161 return; 1162 1163 err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj, 1164 "attached_dev"); 1165 if (err) 1166 return; 1167 1168 err = sysfs_create_link_nowarn(&dev->dev.kobj, 1169 &phydev->mdio.dev.kobj, 1170 "phydev"); 1171 if (err) { 1172 dev_err(&dev->dev, "could not add device link to %s err %d\n", 1173 kobject_name(&phydev->mdio.dev.kobj), 1174 err); 1175 /* non-fatal - some net drivers can use one netdevice 1176 * with more then one phy 1177 */ 1178 } 1179 1180 phydev->sysfs_links = true; 1181 } 1182 1183 static ssize_t 1184 phy_standalone_show(struct device *dev, struct device_attribute *attr, 1185 char *buf) 1186 { 1187 struct phy_device *phydev = to_phy_device(dev); 1188 1189 return sprintf(buf, "%d\n", !phydev->attached_dev); 1190 } 1191 static DEVICE_ATTR_RO(phy_standalone); 1192 1193 /** 1194 * phy_sfp_attach - attach the SFP bus to the PHY upstream network device 1195 * @upstream: pointer to the phy device 1196 * @bus: sfp bus representing cage being attached 1197 * 1198 * This is used to fill in the sfp_upstream_ops .attach member. 1199 */ 1200 void phy_sfp_attach(void *upstream, struct sfp_bus *bus) 1201 { 1202 struct phy_device *phydev = upstream; 1203 1204 if (phydev->attached_dev) 1205 phydev->attached_dev->sfp_bus = bus; 1206 phydev->sfp_bus_attached = true; 1207 } 1208 EXPORT_SYMBOL(phy_sfp_attach); 1209 1210 /** 1211 * phy_sfp_detach - detach the SFP bus from the PHY upstream network device 1212 * @upstream: pointer to the phy device 1213 * @bus: sfp bus representing cage being attached 1214 * 1215 * This is used to fill in the sfp_upstream_ops .detach member. 1216 */ 1217 void phy_sfp_detach(void *upstream, struct sfp_bus *bus) 1218 { 1219 struct phy_device *phydev = upstream; 1220 1221 if (phydev->attached_dev) 1222 phydev->attached_dev->sfp_bus = NULL; 1223 phydev->sfp_bus_attached = false; 1224 } 1225 EXPORT_SYMBOL(phy_sfp_detach); 1226 1227 /** 1228 * phy_sfp_probe - probe for a SFP cage attached to this PHY device 1229 * @phydev: Pointer to phy_device 1230 * @ops: SFP's upstream operations 1231 */ 1232 int phy_sfp_probe(struct phy_device *phydev, 1233 const struct sfp_upstream_ops *ops) 1234 { 1235 struct sfp_bus *bus; 1236 int ret = 0; 1237 1238 if (phydev->mdio.dev.fwnode) { 1239 bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode); 1240 if (IS_ERR(bus)) 1241 return PTR_ERR(bus); 1242 1243 phydev->sfp_bus = bus; 1244 1245 ret = sfp_bus_add_upstream(bus, phydev, ops); 1246 sfp_bus_put(bus); 1247 } 1248 return ret; 1249 } 1250 EXPORT_SYMBOL(phy_sfp_probe); 1251 1252 /** 1253 * phy_attach_direct - attach a network device to a given PHY device pointer 1254 * @dev: network device to attach 1255 * @phydev: Pointer to phy_device to attach 1256 * @flags: PHY device's dev_flags 1257 * @interface: PHY device's interface 1258 * 1259 * Description: Called by drivers to attach to a particular PHY 1260 * device. The phy_device is found, and properly hooked up 1261 * to the phy_driver. If no driver is attached, then a 1262 * generic driver is used. The phy_device is given a ptr to 1263 * the attaching device, and given a callback for link status 1264 * change. The phy_device is returned to the attaching driver. 1265 * This function takes a reference on the phy device. 1266 */ 1267 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, 1268 u32 flags, phy_interface_t interface) 1269 { 1270 struct mii_bus *bus = phydev->mdio.bus; 1271 struct device *d = &phydev->mdio.dev; 1272 struct module *ndev_owner = NULL; 1273 bool using_genphy = false; 1274 int err; 1275 1276 /* For Ethernet device drivers that register their own MDIO bus, we 1277 * will have bus->owner match ndev_mod, so we do not want to increment 1278 * our own module->refcnt here, otherwise we would not be able to 1279 * unload later on. 1280 */ 1281 if (dev) 1282 ndev_owner = dev->dev.parent->driver->owner; 1283 if (ndev_owner != bus->owner && !try_module_get(bus->owner)) { 1284 phydev_err(phydev, "failed to get the bus module\n"); 1285 return -EIO; 1286 } 1287 1288 get_device(d); 1289 1290 /* Assume that if there is no driver, that it doesn't 1291 * exist, and we should use the genphy driver. 1292 */ 1293 if (!d->driver) { 1294 if (phydev->is_c45) 1295 d->driver = &genphy_c45_driver.mdiodrv.driver; 1296 else 1297 d->driver = &genphy_driver.mdiodrv.driver; 1298 1299 using_genphy = true; 1300 } 1301 1302 if (!try_module_get(d->driver->owner)) { 1303 phydev_err(phydev, "failed to get the device driver module\n"); 1304 err = -EIO; 1305 goto error_put_device; 1306 } 1307 1308 if (using_genphy) { 1309 err = d->driver->probe(d); 1310 if (err >= 0) 1311 err = device_bind_driver(d); 1312 1313 if (err) 1314 goto error_module_put; 1315 } 1316 1317 if (phydev->attached_dev) { 1318 dev_err(&dev->dev, "PHY already attached\n"); 1319 err = -EBUSY; 1320 goto error; 1321 } 1322 1323 phydev->phy_link_change = phy_link_change; 1324 if (dev) { 1325 phydev->attached_dev = dev; 1326 dev->phydev = phydev; 1327 1328 if (phydev->sfp_bus_attached) 1329 dev->sfp_bus = phydev->sfp_bus; 1330 } 1331 1332 /* Some Ethernet drivers try to connect to a PHY device before 1333 * calling register_netdevice() -> netdev_register_kobject() and 1334 * does the dev->dev.kobj initialization. Here we only check for 1335 * success which indicates that the network device kobject is 1336 * ready. Once we do that we still need to keep track of whether 1337 * links were successfully set up or not for phy_detach() to 1338 * remove them accordingly. 1339 */ 1340 phydev->sysfs_links = false; 1341 1342 phy_sysfs_create_links(phydev); 1343 1344 if (!phydev->attached_dev) { 1345 err = sysfs_create_file(&phydev->mdio.dev.kobj, 1346 &dev_attr_phy_standalone.attr); 1347 if (err) 1348 phydev_err(phydev, "error creating 'phy_standalone' sysfs entry\n"); 1349 } 1350 1351 phydev->dev_flags |= flags; 1352 1353 phydev->interface = interface; 1354 1355 phydev->state = PHY_READY; 1356 1357 /* Initial carrier state is off as the phy is about to be 1358 * (re)initialized. 1359 */ 1360 if (dev) 1361 netif_carrier_off(phydev->attached_dev); 1362 1363 /* Do initial configuration here, now that 1364 * we have certain key parameters 1365 * (dev_flags and interface) 1366 */ 1367 err = phy_init_hw(phydev); 1368 if (err) 1369 goto error; 1370 1371 phy_resume(phydev); 1372 phy_led_triggers_register(phydev); 1373 1374 return err; 1375 1376 error: 1377 /* phy_detach() does all of the cleanup below */ 1378 phy_detach(phydev); 1379 return err; 1380 1381 error_module_put: 1382 module_put(d->driver->owner); 1383 error_put_device: 1384 put_device(d); 1385 if (ndev_owner != bus->owner) 1386 module_put(bus->owner); 1387 return err; 1388 } 1389 EXPORT_SYMBOL(phy_attach_direct); 1390 1391 /** 1392 * phy_attach - attach a network device to a particular PHY device 1393 * @dev: network device to attach 1394 * @bus_id: Bus ID of PHY device to attach 1395 * @interface: PHY device's interface 1396 * 1397 * Description: Same as phy_attach_direct() except that a PHY bus_id 1398 * string is passed instead of a pointer to a struct phy_device. 1399 */ 1400 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, 1401 phy_interface_t interface) 1402 { 1403 struct bus_type *bus = &mdio_bus_type; 1404 struct phy_device *phydev; 1405 struct device *d; 1406 int rc; 1407 1408 if (!dev) 1409 return ERR_PTR(-EINVAL); 1410 1411 /* Search the list of PHY devices on the mdio bus for the 1412 * PHY with the requested name 1413 */ 1414 d = bus_find_device_by_name(bus, NULL, bus_id); 1415 if (!d) { 1416 pr_err("PHY %s not found\n", bus_id); 1417 return ERR_PTR(-ENODEV); 1418 } 1419 phydev = to_phy_device(d); 1420 1421 rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); 1422 put_device(d); 1423 if (rc) 1424 return ERR_PTR(rc); 1425 1426 return phydev; 1427 } 1428 EXPORT_SYMBOL(phy_attach); 1429 1430 static bool phy_driver_is_genphy_kind(struct phy_device *phydev, 1431 struct device_driver *driver) 1432 { 1433 struct device *d = &phydev->mdio.dev; 1434 bool ret = false; 1435 1436 if (!phydev->drv) 1437 return ret; 1438 1439 get_device(d); 1440 ret = d->driver == driver; 1441 put_device(d); 1442 1443 return ret; 1444 } 1445 1446 bool phy_driver_is_genphy(struct phy_device *phydev) 1447 { 1448 return phy_driver_is_genphy_kind(phydev, 1449 &genphy_driver.mdiodrv.driver); 1450 } 1451 EXPORT_SYMBOL_GPL(phy_driver_is_genphy); 1452 1453 bool phy_driver_is_genphy_10g(struct phy_device *phydev) 1454 { 1455 return phy_driver_is_genphy_kind(phydev, 1456 &genphy_c45_driver.mdiodrv.driver); 1457 } 1458 EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g); 1459 1460 /** 1461 * phy_package_join - join a common PHY group 1462 * @phydev: target phy_device struct 1463 * @addr: cookie and PHY address for global register access 1464 * @priv_size: if non-zero allocate this amount of bytes for private data 1465 * 1466 * This joins a PHY group and provides a shared storage for all phydevs in 1467 * this group. This is intended to be used for packages which contain 1468 * more than one PHY, for example a quad PHY transceiver. 1469 * 1470 * The addr parameter serves as a cookie which has to have the same value 1471 * for all members of one group and as a PHY address to access generic 1472 * registers of a PHY package. Usually, one of the PHY addresses of the 1473 * different PHYs in the package provides access to these global registers. 1474 * The address which is given here, will be used in the phy_package_read() 1475 * and phy_package_write() convenience functions. If your PHY doesn't have 1476 * global registers you can just pick any of the PHY addresses. 1477 * 1478 * This will set the shared pointer of the phydev to the shared storage. 1479 * If this is the first call for a this cookie the shared storage will be 1480 * allocated. If priv_size is non-zero, the given amount of bytes are 1481 * allocated for the priv member. 1482 * 1483 * Returns < 1 on error, 0 on success. Esp. calling phy_package_join() 1484 * with the same cookie but a different priv_size is an error. 1485 */ 1486 int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size) 1487 { 1488 struct mii_bus *bus = phydev->mdio.bus; 1489 struct phy_package_shared *shared; 1490 int ret; 1491 1492 if (addr < 0 || addr >= PHY_MAX_ADDR) 1493 return -EINVAL; 1494 1495 mutex_lock(&bus->shared_lock); 1496 shared = bus->shared[addr]; 1497 if (!shared) { 1498 ret = -ENOMEM; 1499 shared = kzalloc(sizeof(*shared), GFP_KERNEL); 1500 if (!shared) 1501 goto err_unlock; 1502 if (priv_size) { 1503 shared->priv = kzalloc(priv_size, GFP_KERNEL); 1504 if (!shared->priv) 1505 goto err_free; 1506 shared->priv_size = priv_size; 1507 } 1508 shared->addr = addr; 1509 refcount_set(&shared->refcnt, 1); 1510 bus->shared[addr] = shared; 1511 } else { 1512 ret = -EINVAL; 1513 if (priv_size && priv_size != shared->priv_size) 1514 goto err_unlock; 1515 refcount_inc(&shared->refcnt); 1516 } 1517 mutex_unlock(&bus->shared_lock); 1518 1519 phydev->shared = shared; 1520 1521 return 0; 1522 1523 err_free: 1524 kfree(shared); 1525 err_unlock: 1526 mutex_unlock(&bus->shared_lock); 1527 return ret; 1528 } 1529 EXPORT_SYMBOL_GPL(phy_package_join); 1530 1531 /** 1532 * phy_package_leave - leave a common PHY group 1533 * @phydev: target phy_device struct 1534 * 1535 * This leaves a PHY group created by phy_package_join(). If this phydev 1536 * was the last user of the shared data between the group, this data is 1537 * freed. Resets the phydev->shared pointer to NULL. 1538 */ 1539 void phy_package_leave(struct phy_device *phydev) 1540 { 1541 struct phy_package_shared *shared = phydev->shared; 1542 struct mii_bus *bus = phydev->mdio.bus; 1543 1544 if (!shared) 1545 return; 1546 1547 if (refcount_dec_and_mutex_lock(&shared->refcnt, &bus->shared_lock)) { 1548 bus->shared[shared->addr] = NULL; 1549 mutex_unlock(&bus->shared_lock); 1550 kfree(shared->priv); 1551 kfree(shared); 1552 } 1553 1554 phydev->shared = NULL; 1555 } 1556 EXPORT_SYMBOL_GPL(phy_package_leave); 1557 1558 static void devm_phy_package_leave(struct device *dev, void *res) 1559 { 1560 phy_package_leave(*(struct phy_device **)res); 1561 } 1562 1563 /** 1564 * devm_phy_package_join - resource managed phy_package_join() 1565 * @dev: device that is registering this PHY package 1566 * @phydev: target phy_device struct 1567 * @addr: cookie and PHY address for global register access 1568 * @priv_size: if non-zero allocate this amount of bytes for private data 1569 * 1570 * Managed phy_package_join(). Shared storage fetched by this function, 1571 * phy_package_leave() is automatically called on driver detach. See 1572 * phy_package_join() for more information. 1573 */ 1574 int devm_phy_package_join(struct device *dev, struct phy_device *phydev, 1575 int addr, size_t priv_size) 1576 { 1577 struct phy_device **ptr; 1578 int ret; 1579 1580 ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr), 1581 GFP_KERNEL); 1582 if (!ptr) 1583 return -ENOMEM; 1584 1585 ret = phy_package_join(phydev, addr, priv_size); 1586 1587 if (!ret) { 1588 *ptr = phydev; 1589 devres_add(dev, ptr); 1590 } else { 1591 devres_free(ptr); 1592 } 1593 1594 return ret; 1595 } 1596 EXPORT_SYMBOL_GPL(devm_phy_package_join); 1597 1598 /** 1599 * phy_detach - detach a PHY device from its network device 1600 * @phydev: target phy_device struct 1601 * 1602 * This detaches the phy device from its network device and the phy 1603 * driver, and drops the reference count taken in phy_attach_direct(). 1604 */ 1605 void phy_detach(struct phy_device *phydev) 1606 { 1607 struct net_device *dev = phydev->attached_dev; 1608 struct module *ndev_owner = NULL; 1609 struct mii_bus *bus; 1610 1611 if (phydev->sysfs_links) { 1612 if (dev) 1613 sysfs_remove_link(&dev->dev.kobj, "phydev"); 1614 sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev"); 1615 } 1616 1617 if (!phydev->attached_dev) 1618 sysfs_remove_file(&phydev->mdio.dev.kobj, 1619 &dev_attr_phy_standalone.attr); 1620 1621 phy_suspend(phydev); 1622 if (dev) { 1623 phydev->attached_dev->phydev = NULL; 1624 phydev->attached_dev = NULL; 1625 } 1626 phydev->phylink = NULL; 1627 1628 phy_led_triggers_unregister(phydev); 1629 1630 module_put(phydev->mdio.dev.driver->owner); 1631 1632 /* If the device had no specific driver before (i.e. - it 1633 * was using the generic driver), we unbind the device 1634 * from the generic driver so that there's a chance a 1635 * real driver could be loaded 1636 */ 1637 if (phy_driver_is_genphy(phydev) || 1638 phy_driver_is_genphy_10g(phydev)) 1639 device_release_driver(&phydev->mdio.dev); 1640 1641 /* 1642 * The phydev might go away on the put_device() below, so avoid 1643 * a use-after-free bug by reading the underlying bus first. 1644 */ 1645 bus = phydev->mdio.bus; 1646 1647 put_device(&phydev->mdio.dev); 1648 if (dev) 1649 ndev_owner = dev->dev.parent->driver->owner; 1650 if (ndev_owner != bus->owner) 1651 module_put(bus->owner); 1652 1653 /* Assert the reset signal */ 1654 phy_device_reset(phydev, 1); 1655 } 1656 EXPORT_SYMBOL(phy_detach); 1657 1658 int phy_suspend(struct phy_device *phydev) 1659 { 1660 struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL }; 1661 struct net_device *netdev = phydev->attached_dev; 1662 struct phy_driver *phydrv = phydev->drv; 1663 int ret; 1664 1665 if (phydev->suspended) 1666 return 0; 1667 1668 /* If the device has WOL enabled, we cannot suspend the PHY */ 1669 phy_ethtool_get_wol(phydev, &wol); 1670 if (wol.wolopts || (netdev && netdev->wol_enabled)) 1671 return -EBUSY; 1672 1673 if (!phydrv || !phydrv->suspend) 1674 return 0; 1675 1676 ret = phydrv->suspend(phydev); 1677 if (!ret) 1678 phydev->suspended = true; 1679 1680 return ret; 1681 } 1682 EXPORT_SYMBOL(phy_suspend); 1683 1684 int __phy_resume(struct phy_device *phydev) 1685 { 1686 struct phy_driver *phydrv = phydev->drv; 1687 int ret; 1688 1689 WARN_ON(!mutex_is_locked(&phydev->lock)); 1690 1691 if (!phydrv || !phydrv->resume) 1692 return 0; 1693 1694 ret = phydrv->resume(phydev); 1695 if (!ret) 1696 phydev->suspended = false; 1697 1698 return ret; 1699 } 1700 EXPORT_SYMBOL(__phy_resume); 1701 1702 int phy_resume(struct phy_device *phydev) 1703 { 1704 int ret; 1705 1706 mutex_lock(&phydev->lock); 1707 ret = __phy_resume(phydev); 1708 mutex_unlock(&phydev->lock); 1709 1710 return ret; 1711 } 1712 EXPORT_SYMBOL(phy_resume); 1713 1714 int phy_loopback(struct phy_device *phydev, bool enable) 1715 { 1716 struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver); 1717 int ret = 0; 1718 1719 mutex_lock(&phydev->lock); 1720 1721 if (enable && phydev->loopback_enabled) { 1722 ret = -EBUSY; 1723 goto out; 1724 } 1725 1726 if (!enable && !phydev->loopback_enabled) { 1727 ret = -EINVAL; 1728 goto out; 1729 } 1730 1731 if (phydev->drv && phydrv->set_loopback) 1732 ret = phydrv->set_loopback(phydev, enable); 1733 else 1734 ret = -EOPNOTSUPP; 1735 1736 if (ret) 1737 goto out; 1738 1739 phydev->loopback_enabled = enable; 1740 1741 out: 1742 mutex_unlock(&phydev->lock); 1743 return ret; 1744 } 1745 EXPORT_SYMBOL(phy_loopback); 1746 1747 /** 1748 * phy_reset_after_clk_enable - perform a PHY reset if needed 1749 * @phydev: target phy_device struct 1750 * 1751 * Description: Some PHYs are known to need a reset after their refclk was 1752 * enabled. This function evaluates the flags and perform the reset if it's 1753 * needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy 1754 * was reset. 1755 */ 1756 int phy_reset_after_clk_enable(struct phy_device *phydev) 1757 { 1758 if (!phydev || !phydev->drv) 1759 return -ENODEV; 1760 1761 if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) { 1762 phy_device_reset(phydev, 1); 1763 phy_device_reset(phydev, 0); 1764 return 1; 1765 } 1766 1767 return 0; 1768 } 1769 EXPORT_SYMBOL(phy_reset_after_clk_enable); 1770 1771 /* Generic PHY support and helper functions */ 1772 1773 /** 1774 * genphy_config_advert - sanitize and advertise auto-negotiation parameters 1775 * @phydev: target phy_device struct 1776 * 1777 * Description: Writes MII_ADVERTISE with the appropriate values, 1778 * after sanitizing the values to make sure we only advertise 1779 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1780 * hasn't changed, and > 0 if it has changed. 1781 */ 1782 static int genphy_config_advert(struct phy_device *phydev) 1783 { 1784 int err, bmsr, changed = 0; 1785 u32 adv; 1786 1787 /* Only allow advertising what this PHY supports */ 1788 linkmode_and(phydev->advertising, phydev->advertising, 1789 phydev->supported); 1790 1791 adv = linkmode_adv_to_mii_adv_t(phydev->advertising); 1792 1793 /* Setup standard advertisement */ 1794 err = phy_modify_changed(phydev, MII_ADVERTISE, 1795 ADVERTISE_ALL | ADVERTISE_100BASE4 | 1796 ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM, 1797 adv); 1798 if (err < 0) 1799 return err; 1800 if (err > 0) 1801 changed = 1; 1802 1803 bmsr = phy_read(phydev, MII_BMSR); 1804 if (bmsr < 0) 1805 return bmsr; 1806 1807 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all 1808 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a 1809 * logical 1. 1810 */ 1811 if (!(bmsr & BMSR_ESTATEN)) 1812 return changed; 1813 1814 adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising); 1815 1816 err = phy_modify_changed(phydev, MII_CTRL1000, 1817 ADVERTISE_1000FULL | ADVERTISE_1000HALF, 1818 adv); 1819 if (err < 0) 1820 return err; 1821 if (err > 0) 1822 changed = 1; 1823 1824 return changed; 1825 } 1826 1827 /** 1828 * genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters 1829 * @phydev: target phy_device struct 1830 * 1831 * Description: Writes MII_ADVERTISE with the appropriate values, 1832 * after sanitizing the values to make sure we only advertise 1833 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement 1834 * hasn't changed, and > 0 if it has changed. This function is intended 1835 * for Clause 37 1000Base-X mode. 1836 */ 1837 static int genphy_c37_config_advert(struct phy_device *phydev) 1838 { 1839 u16 adv = 0; 1840 1841 /* Only allow advertising what this PHY supports */ 1842 linkmode_and(phydev->advertising, phydev->advertising, 1843 phydev->supported); 1844 1845 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 1846 phydev->advertising)) 1847 adv |= ADVERTISE_1000XFULL; 1848 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, 1849 phydev->advertising)) 1850 adv |= ADVERTISE_1000XPAUSE; 1851 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 1852 phydev->advertising)) 1853 adv |= ADVERTISE_1000XPSE_ASYM; 1854 1855 return phy_modify_changed(phydev, MII_ADVERTISE, 1856 ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE | 1857 ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM, 1858 adv); 1859 } 1860 1861 /** 1862 * genphy_config_eee_advert - disable unwanted eee mode advertisement 1863 * @phydev: target phy_device struct 1864 * 1865 * Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy 1866 * efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't 1867 * changed, and 1 if it has changed. 1868 */ 1869 int genphy_config_eee_advert(struct phy_device *phydev) 1870 { 1871 int err; 1872 1873 /* Nothing to disable */ 1874 if (!phydev->eee_broken_modes) 1875 return 0; 1876 1877 err = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, 1878 phydev->eee_broken_modes, 0); 1879 /* If the call failed, we assume that EEE is not supported */ 1880 return err < 0 ? 0 : err; 1881 } 1882 EXPORT_SYMBOL(genphy_config_eee_advert); 1883 1884 /** 1885 * genphy_setup_forced - configures/forces speed/duplex from @phydev 1886 * @phydev: target phy_device struct 1887 * 1888 * Description: Configures MII_BMCR to force speed/duplex 1889 * to the values in phydev. Assumes that the values are valid. 1890 * Please see phy_sanitize_settings(). 1891 */ 1892 int genphy_setup_forced(struct phy_device *phydev) 1893 { 1894 u16 ctl = 0; 1895 1896 phydev->pause = 0; 1897 phydev->asym_pause = 0; 1898 1899 if (SPEED_1000 == phydev->speed) 1900 ctl |= BMCR_SPEED1000; 1901 else if (SPEED_100 == phydev->speed) 1902 ctl |= BMCR_SPEED100; 1903 1904 if (DUPLEX_FULL == phydev->duplex) 1905 ctl |= BMCR_FULLDPLX; 1906 1907 return phy_modify(phydev, MII_BMCR, 1908 ~(BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN), ctl); 1909 } 1910 EXPORT_SYMBOL(genphy_setup_forced); 1911 1912 static int genphy_setup_master_slave(struct phy_device *phydev) 1913 { 1914 u16 ctl = 0; 1915 1916 if (!phydev->is_gigabit_capable) 1917 return 0; 1918 1919 switch (phydev->master_slave_set) { 1920 case MASTER_SLAVE_CFG_MASTER_PREFERRED: 1921 ctl |= CTL1000_PREFER_MASTER; 1922 break; 1923 case MASTER_SLAVE_CFG_SLAVE_PREFERRED: 1924 break; 1925 case MASTER_SLAVE_CFG_MASTER_FORCE: 1926 ctl |= CTL1000_AS_MASTER; 1927 /* fallthrough */ 1928 case MASTER_SLAVE_CFG_SLAVE_FORCE: 1929 ctl |= CTL1000_ENABLE_MASTER; 1930 break; 1931 case MASTER_SLAVE_CFG_UNKNOWN: 1932 case MASTER_SLAVE_CFG_UNSUPPORTED: 1933 return 0; 1934 default: 1935 phydev_warn(phydev, "Unsupported Master/Slave mode\n"); 1936 return -EOPNOTSUPP; 1937 } 1938 1939 return phy_modify_changed(phydev, MII_CTRL1000, 1940 (CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER | 1941 CTL1000_PREFER_MASTER), ctl); 1942 } 1943 1944 static int genphy_read_master_slave(struct phy_device *phydev) 1945 { 1946 int cfg, state; 1947 int val; 1948 1949 if (!phydev->is_gigabit_capable) { 1950 phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED; 1951 phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED; 1952 return 0; 1953 } 1954 1955 phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN; 1956 phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN; 1957 1958 val = phy_read(phydev, MII_CTRL1000); 1959 if (val < 0) 1960 return val; 1961 1962 if (val & CTL1000_ENABLE_MASTER) { 1963 if (val & CTL1000_AS_MASTER) 1964 cfg = MASTER_SLAVE_CFG_MASTER_FORCE; 1965 else 1966 cfg = MASTER_SLAVE_CFG_SLAVE_FORCE; 1967 } else { 1968 if (val & CTL1000_PREFER_MASTER) 1969 cfg = MASTER_SLAVE_CFG_MASTER_PREFERRED; 1970 else 1971 cfg = MASTER_SLAVE_CFG_SLAVE_PREFERRED; 1972 } 1973 1974 val = phy_read(phydev, MII_STAT1000); 1975 if (val < 0) 1976 return val; 1977 1978 if (val & LPA_1000MSFAIL) { 1979 state = MASTER_SLAVE_STATE_ERR; 1980 } else if (phydev->link) { 1981 /* this bits are valid only for active link */ 1982 if (val & LPA_1000MSRES) 1983 state = MASTER_SLAVE_STATE_MASTER; 1984 else 1985 state = MASTER_SLAVE_STATE_SLAVE; 1986 } else { 1987 state = MASTER_SLAVE_STATE_UNKNOWN; 1988 } 1989 1990 phydev->master_slave_get = cfg; 1991 phydev->master_slave_state = state; 1992 1993 return 0; 1994 } 1995 1996 /** 1997 * genphy_restart_aneg - Enable and Restart Autonegotiation 1998 * @phydev: target phy_device struct 1999 */ 2000 int genphy_restart_aneg(struct phy_device *phydev) 2001 { 2002 /* Don't isolate the PHY if we're negotiating */ 2003 return phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, 2004 BMCR_ANENABLE | BMCR_ANRESTART); 2005 } 2006 EXPORT_SYMBOL(genphy_restart_aneg); 2007 2008 /** 2009 * genphy_check_and_restart_aneg - Enable and restart auto-negotiation 2010 * @phydev: target phy_device struct 2011 * @restart: whether aneg restart is requested 2012 * 2013 * Check, and restart auto-negotiation if needed. 2014 */ 2015 int genphy_check_and_restart_aneg(struct phy_device *phydev, bool restart) 2016 { 2017 int ret; 2018 2019 if (!restart) { 2020 /* Advertisement hasn't changed, but maybe aneg was never on to 2021 * begin with? Or maybe phy was isolated? 2022 */ 2023 ret = phy_read(phydev, MII_BMCR); 2024 if (ret < 0) 2025 return ret; 2026 2027 if (!(ret & BMCR_ANENABLE) || (ret & BMCR_ISOLATE)) 2028 restart = true; 2029 } 2030 2031 if (restart) 2032 return genphy_restart_aneg(phydev); 2033 2034 return 0; 2035 } 2036 EXPORT_SYMBOL(genphy_check_and_restart_aneg); 2037 2038 /** 2039 * __genphy_config_aneg - restart auto-negotiation or write BMCR 2040 * @phydev: target phy_device struct 2041 * @changed: whether autoneg is requested 2042 * 2043 * Description: If auto-negotiation is enabled, we configure the 2044 * advertising, and then restart auto-negotiation. If it is not 2045 * enabled, then we write the BMCR. 2046 */ 2047 int __genphy_config_aneg(struct phy_device *phydev, bool changed) 2048 { 2049 int err; 2050 2051 if (genphy_config_eee_advert(phydev)) 2052 changed = true; 2053 2054 err = genphy_setup_master_slave(phydev); 2055 if (err < 0) 2056 return err; 2057 else if (err) 2058 changed = true; 2059 2060 if (AUTONEG_ENABLE != phydev->autoneg) 2061 return genphy_setup_forced(phydev); 2062 2063 err = genphy_config_advert(phydev); 2064 if (err < 0) /* error */ 2065 return err; 2066 else if (err) 2067 changed = true; 2068 2069 return genphy_check_and_restart_aneg(phydev, changed); 2070 } 2071 EXPORT_SYMBOL(__genphy_config_aneg); 2072 2073 /** 2074 * genphy_c37_config_aneg - restart auto-negotiation or write BMCR 2075 * @phydev: target phy_device struct 2076 * 2077 * Description: If auto-negotiation is enabled, we configure the 2078 * advertising, and then restart auto-negotiation. If it is not 2079 * enabled, then we write the BMCR. This function is intended 2080 * for use with Clause 37 1000Base-X mode. 2081 */ 2082 int genphy_c37_config_aneg(struct phy_device *phydev) 2083 { 2084 int err, changed; 2085 2086 if (phydev->autoneg != AUTONEG_ENABLE) 2087 return genphy_setup_forced(phydev); 2088 2089 err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100, 2090 BMCR_SPEED1000); 2091 if (err) 2092 return err; 2093 2094 changed = genphy_c37_config_advert(phydev); 2095 if (changed < 0) /* error */ 2096 return changed; 2097 2098 if (!changed) { 2099 /* Advertisement hasn't changed, but maybe aneg was never on to 2100 * begin with? Or maybe phy was isolated? 2101 */ 2102 int ctl = phy_read(phydev, MII_BMCR); 2103 2104 if (ctl < 0) 2105 return ctl; 2106 2107 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE)) 2108 changed = 1; /* do restart aneg */ 2109 } 2110 2111 /* Only restart aneg if we are advertising something different 2112 * than we were before. 2113 */ 2114 if (changed > 0) 2115 return genphy_restart_aneg(phydev); 2116 2117 return 0; 2118 } 2119 EXPORT_SYMBOL(genphy_c37_config_aneg); 2120 2121 /** 2122 * genphy_aneg_done - return auto-negotiation status 2123 * @phydev: target phy_device struct 2124 * 2125 * Description: Reads the status register and returns 0 either if 2126 * auto-negotiation is incomplete, or if there was an error. 2127 * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. 2128 */ 2129 int genphy_aneg_done(struct phy_device *phydev) 2130 { 2131 int retval = phy_read(phydev, MII_BMSR); 2132 2133 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); 2134 } 2135 EXPORT_SYMBOL(genphy_aneg_done); 2136 2137 /** 2138 * genphy_update_link - update link status in @phydev 2139 * @phydev: target phy_device struct 2140 * 2141 * Description: Update the value in phydev->link to reflect the 2142 * current link value. In order to do this, we need to read 2143 * the status register twice, keeping the second value. 2144 */ 2145 int genphy_update_link(struct phy_device *phydev) 2146 { 2147 int status = 0, bmcr; 2148 2149 bmcr = phy_read(phydev, MII_BMCR); 2150 if (bmcr < 0) 2151 return bmcr; 2152 2153 /* Autoneg is being started, therefore disregard BMSR value and 2154 * report link as down. 2155 */ 2156 if (bmcr & BMCR_ANRESTART) 2157 goto done; 2158 2159 /* The link state is latched low so that momentary link 2160 * drops can be detected. Do not double-read the status 2161 * in polling mode to detect such short link drops except 2162 * the link was already down. 2163 */ 2164 if (!phy_polling_mode(phydev) || !phydev->link) { 2165 status = phy_read(phydev, MII_BMSR); 2166 if (status < 0) 2167 return status; 2168 else if (status & BMSR_LSTATUS) 2169 goto done; 2170 } 2171 2172 /* Read link and autonegotiation status */ 2173 status = phy_read(phydev, MII_BMSR); 2174 if (status < 0) 2175 return status; 2176 done: 2177 phydev->link = status & BMSR_LSTATUS ? 1 : 0; 2178 phydev->autoneg_complete = status & BMSR_ANEGCOMPLETE ? 1 : 0; 2179 2180 /* Consider the case that autoneg was started and "aneg complete" 2181 * bit has been reset, but "link up" bit not yet. 2182 */ 2183 if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete) 2184 phydev->link = 0; 2185 2186 return 0; 2187 } 2188 EXPORT_SYMBOL(genphy_update_link); 2189 2190 int genphy_read_lpa(struct phy_device *phydev) 2191 { 2192 int lpa, lpagb; 2193 2194 if (phydev->autoneg == AUTONEG_ENABLE) { 2195 if (!phydev->autoneg_complete) { 2196 mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, 2197 0); 2198 mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0); 2199 return 0; 2200 } 2201 2202 if (phydev->is_gigabit_capable) { 2203 lpagb = phy_read(phydev, MII_STAT1000); 2204 if (lpagb < 0) 2205 return lpagb; 2206 2207 if (lpagb & LPA_1000MSFAIL) { 2208 int adv = phy_read(phydev, MII_CTRL1000); 2209 2210 if (adv < 0) 2211 return adv; 2212 2213 if (adv & CTL1000_ENABLE_MASTER) 2214 phydev_err(phydev, "Master/Slave resolution failed, maybe conflicting manual settings?\n"); 2215 else 2216 phydev_err(phydev, "Master/Slave resolution failed\n"); 2217 return -ENOLINK; 2218 } 2219 2220 mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, 2221 lpagb); 2222 } 2223 2224 lpa = phy_read(phydev, MII_LPA); 2225 if (lpa < 0) 2226 return lpa; 2227 2228 mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa); 2229 } else { 2230 linkmode_zero(phydev->lp_advertising); 2231 } 2232 2233 return 0; 2234 } 2235 EXPORT_SYMBOL(genphy_read_lpa); 2236 2237 /** 2238 * genphy_read_status_fixed - read the link parameters for !aneg mode 2239 * @phydev: target phy_device struct 2240 * 2241 * Read the current duplex and speed state for a PHY operating with 2242 * autonegotiation disabled. 2243 */ 2244 int genphy_read_status_fixed(struct phy_device *phydev) 2245 { 2246 int bmcr = phy_read(phydev, MII_BMCR); 2247 2248 if (bmcr < 0) 2249 return bmcr; 2250 2251 if (bmcr & BMCR_FULLDPLX) 2252 phydev->duplex = DUPLEX_FULL; 2253 else 2254 phydev->duplex = DUPLEX_HALF; 2255 2256 if (bmcr & BMCR_SPEED1000) 2257 phydev->speed = SPEED_1000; 2258 else if (bmcr & BMCR_SPEED100) 2259 phydev->speed = SPEED_100; 2260 else 2261 phydev->speed = SPEED_10; 2262 2263 return 0; 2264 } 2265 EXPORT_SYMBOL(genphy_read_status_fixed); 2266 2267 /** 2268 * genphy_read_status - check the link status and update current link state 2269 * @phydev: target phy_device struct 2270 * 2271 * Description: Check the link, then figure out the current state 2272 * by comparing what we advertise with what the link partner 2273 * advertises. Start by checking the gigabit possibilities, 2274 * then move on to 10/100. 2275 */ 2276 int genphy_read_status(struct phy_device *phydev) 2277 { 2278 int err, old_link = phydev->link; 2279 2280 /* Update the link, but return if there was an error */ 2281 err = genphy_update_link(phydev); 2282 if (err) 2283 return err; 2284 2285 /* why bother the PHY if nothing can have changed */ 2286 if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link) 2287 return 0; 2288 2289 phydev->speed = SPEED_UNKNOWN; 2290 phydev->duplex = DUPLEX_UNKNOWN; 2291 phydev->pause = 0; 2292 phydev->asym_pause = 0; 2293 2294 err = genphy_read_master_slave(phydev); 2295 if (err < 0) 2296 return err; 2297 2298 err = genphy_read_lpa(phydev); 2299 if (err < 0) 2300 return err; 2301 2302 if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) { 2303 phy_resolve_aneg_linkmode(phydev); 2304 } else if (phydev->autoneg == AUTONEG_DISABLE) { 2305 err = genphy_read_status_fixed(phydev); 2306 if (err < 0) 2307 return err; 2308 } 2309 2310 return 0; 2311 } 2312 EXPORT_SYMBOL(genphy_read_status); 2313 2314 /** 2315 * genphy_c37_read_status - check the link status and update current link state 2316 * @phydev: target phy_device struct 2317 * 2318 * Description: Check the link, then figure out the current state 2319 * by comparing what we advertise with what the link partner 2320 * advertises. This function is for Clause 37 1000Base-X mode. 2321 */ 2322 int genphy_c37_read_status(struct phy_device *phydev) 2323 { 2324 int lpa, err, old_link = phydev->link; 2325 2326 /* Update the link, but return if there was an error */ 2327 err = genphy_update_link(phydev); 2328 if (err) 2329 return err; 2330 2331 /* why bother the PHY if nothing can have changed */ 2332 if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link) 2333 return 0; 2334 2335 phydev->duplex = DUPLEX_UNKNOWN; 2336 phydev->pause = 0; 2337 phydev->asym_pause = 0; 2338 2339 if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) { 2340 lpa = phy_read(phydev, MII_LPA); 2341 if (lpa < 0) 2342 return lpa; 2343 2344 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, 2345 phydev->lp_advertising, lpa & LPA_LPACK); 2346 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 2347 phydev->lp_advertising, lpa & LPA_1000XFULL); 2348 linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2349 phydev->lp_advertising, lpa & LPA_1000XPAUSE); 2350 linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2351 phydev->lp_advertising, 2352 lpa & LPA_1000XPAUSE_ASYM); 2353 2354 phy_resolve_aneg_linkmode(phydev); 2355 } else if (phydev->autoneg == AUTONEG_DISABLE) { 2356 int bmcr = phy_read(phydev, MII_BMCR); 2357 2358 if (bmcr < 0) 2359 return bmcr; 2360 2361 if (bmcr & BMCR_FULLDPLX) 2362 phydev->duplex = DUPLEX_FULL; 2363 else 2364 phydev->duplex = DUPLEX_HALF; 2365 } 2366 2367 return 0; 2368 } 2369 EXPORT_SYMBOL(genphy_c37_read_status); 2370 2371 /** 2372 * genphy_soft_reset - software reset the PHY via BMCR_RESET bit 2373 * @phydev: target phy_device struct 2374 * 2375 * Description: Perform a software PHY reset using the standard 2376 * BMCR_RESET bit and poll for the reset bit to be cleared. 2377 * 2378 * Returns: 0 on success, < 0 on failure 2379 */ 2380 int genphy_soft_reset(struct phy_device *phydev) 2381 { 2382 u16 res = BMCR_RESET; 2383 int ret; 2384 2385 if (phydev->autoneg == AUTONEG_ENABLE) 2386 res |= BMCR_ANRESTART; 2387 2388 ret = phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, res); 2389 if (ret < 0) 2390 return ret; 2391 2392 /* Clause 22 states that setting bit BMCR_RESET sets control registers 2393 * to their default value. Therefore the POWER DOWN bit is supposed to 2394 * be cleared after soft reset. 2395 */ 2396 phydev->suspended = 0; 2397 2398 ret = phy_poll_reset(phydev); 2399 if (ret) 2400 return ret; 2401 2402 /* BMCR may be reset to defaults */ 2403 if (phydev->autoneg == AUTONEG_DISABLE) 2404 ret = genphy_setup_forced(phydev); 2405 2406 return ret; 2407 } 2408 EXPORT_SYMBOL(genphy_soft_reset); 2409 2410 /** 2411 * genphy_read_abilities - read PHY abilities from Clause 22 registers 2412 * @phydev: target phy_device struct 2413 * 2414 * Description: Reads the PHY's abilities and populates 2415 * phydev->supported accordingly. 2416 * 2417 * Returns: 0 on success, < 0 on failure 2418 */ 2419 int genphy_read_abilities(struct phy_device *phydev) 2420 { 2421 int val; 2422 2423 linkmode_set_bit_array(phy_basic_ports_array, 2424 ARRAY_SIZE(phy_basic_ports_array), 2425 phydev->supported); 2426 2427 val = phy_read(phydev, MII_BMSR); 2428 if (val < 0) 2429 return val; 2430 2431 linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported, 2432 val & BMSR_ANEGCAPABLE); 2433 2434 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported, 2435 val & BMSR_100FULL); 2436 linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, phydev->supported, 2437 val & BMSR_100HALF); 2438 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, phydev->supported, 2439 val & BMSR_10FULL); 2440 linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, phydev->supported, 2441 val & BMSR_10HALF); 2442 2443 if (val & BMSR_ESTATEN) { 2444 val = phy_read(phydev, MII_ESTATUS); 2445 if (val < 0) 2446 return val; 2447 2448 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 2449 phydev->supported, val & ESTATUS_1000_TFULL); 2450 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, 2451 phydev->supported, val & ESTATUS_1000_THALF); 2452 linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, 2453 phydev->supported, val & ESTATUS_1000_XFULL); 2454 } 2455 2456 return 0; 2457 } 2458 EXPORT_SYMBOL(genphy_read_abilities); 2459 2460 /* This is used for the phy device which doesn't support the MMD extended 2461 * register access, but it does have side effect when we are trying to access 2462 * the MMD register via indirect method. 2463 */ 2464 int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum) 2465 { 2466 return -EOPNOTSUPP; 2467 } 2468 EXPORT_SYMBOL(genphy_read_mmd_unsupported); 2469 2470 int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum, 2471 u16 regnum, u16 val) 2472 { 2473 return -EOPNOTSUPP; 2474 } 2475 EXPORT_SYMBOL(genphy_write_mmd_unsupported); 2476 2477 int genphy_suspend(struct phy_device *phydev) 2478 { 2479 return phy_set_bits(phydev, MII_BMCR, BMCR_PDOWN); 2480 } 2481 EXPORT_SYMBOL(genphy_suspend); 2482 2483 int genphy_resume(struct phy_device *phydev) 2484 { 2485 return phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN); 2486 } 2487 EXPORT_SYMBOL(genphy_resume); 2488 2489 int genphy_loopback(struct phy_device *phydev, bool enable) 2490 { 2491 return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 2492 enable ? BMCR_LOOPBACK : 0); 2493 } 2494 EXPORT_SYMBOL(genphy_loopback); 2495 2496 /** 2497 * phy_remove_link_mode - Remove a supported link mode 2498 * @phydev: phy_device structure to remove link mode from 2499 * @link_mode: Link mode to be removed 2500 * 2501 * Description: Some MACs don't support all link modes which the PHY 2502 * does. e.g. a 1G MAC often does not support 1000Half. Add a helper 2503 * to remove a link mode. 2504 */ 2505 void phy_remove_link_mode(struct phy_device *phydev, u32 link_mode) 2506 { 2507 linkmode_clear_bit(link_mode, phydev->supported); 2508 phy_advertise_supported(phydev); 2509 } 2510 EXPORT_SYMBOL(phy_remove_link_mode); 2511 2512 static void phy_copy_pause_bits(unsigned long *dst, unsigned long *src) 2513 { 2514 linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, dst, 2515 linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, src)); 2516 linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, dst, 2517 linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, src)); 2518 } 2519 2520 /** 2521 * phy_advertise_supported - Advertise all supported modes 2522 * @phydev: target phy_device struct 2523 * 2524 * Description: Called to advertise all supported modes, doesn't touch 2525 * pause mode advertising. 2526 */ 2527 void phy_advertise_supported(struct phy_device *phydev) 2528 { 2529 __ETHTOOL_DECLARE_LINK_MODE_MASK(new); 2530 2531 linkmode_copy(new, phydev->supported); 2532 phy_copy_pause_bits(new, phydev->advertising); 2533 linkmode_copy(phydev->advertising, new); 2534 } 2535 EXPORT_SYMBOL(phy_advertise_supported); 2536 2537 /** 2538 * phy_support_sym_pause - Enable support of symmetrical pause 2539 * @phydev: target phy_device struct 2540 * 2541 * Description: Called by the MAC to indicate is supports symmetrical 2542 * Pause, but not asym pause. 2543 */ 2544 void phy_support_sym_pause(struct phy_device *phydev) 2545 { 2546 linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported); 2547 phy_copy_pause_bits(phydev->advertising, phydev->supported); 2548 } 2549 EXPORT_SYMBOL(phy_support_sym_pause); 2550 2551 /** 2552 * phy_support_asym_pause - Enable support of asym pause 2553 * @phydev: target phy_device struct 2554 * 2555 * Description: Called by the MAC to indicate is supports Asym Pause. 2556 */ 2557 void phy_support_asym_pause(struct phy_device *phydev) 2558 { 2559 phy_copy_pause_bits(phydev->advertising, phydev->supported); 2560 } 2561 EXPORT_SYMBOL(phy_support_asym_pause); 2562 2563 /** 2564 * phy_set_sym_pause - Configure symmetric Pause 2565 * @phydev: target phy_device struct 2566 * @rx: Receiver Pause is supported 2567 * @tx: Transmit Pause is supported 2568 * @autoneg: Auto neg should be used 2569 * 2570 * Description: Configure advertised Pause support depending on if 2571 * receiver pause and pause auto neg is supported. Generally called 2572 * from the set_pauseparam .ndo. 2573 */ 2574 void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx, 2575 bool autoneg) 2576 { 2577 linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported); 2578 2579 if (rx && tx && autoneg) 2580 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2581 phydev->supported); 2582 2583 linkmode_copy(phydev->advertising, phydev->supported); 2584 } 2585 EXPORT_SYMBOL(phy_set_sym_pause); 2586 2587 /** 2588 * phy_set_asym_pause - Configure Pause and Asym Pause 2589 * @phydev: target phy_device struct 2590 * @rx: Receiver Pause is supported 2591 * @tx: Transmit Pause is supported 2592 * 2593 * Description: Configure advertised Pause support depending on if 2594 * transmit and receiver pause is supported. If there has been a 2595 * change in adverting, trigger a new autoneg. Generally called from 2596 * the set_pauseparam .ndo. 2597 */ 2598 void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx) 2599 { 2600 __ETHTOOL_DECLARE_LINK_MODE_MASK(oldadv); 2601 2602 linkmode_copy(oldadv, phydev->advertising); 2603 linkmode_set_pause(phydev->advertising, tx, rx); 2604 2605 if (!linkmode_equal(oldadv, phydev->advertising) && 2606 phydev->autoneg) 2607 phy_start_aneg(phydev); 2608 } 2609 EXPORT_SYMBOL(phy_set_asym_pause); 2610 2611 /** 2612 * phy_validate_pause - Test if the PHY/MAC support the pause configuration 2613 * @phydev: phy_device struct 2614 * @pp: requested pause configuration 2615 * 2616 * Description: Test if the PHY/MAC combination supports the Pause 2617 * configuration the user is requesting. Returns True if it is 2618 * supported, false otherwise. 2619 */ 2620 bool phy_validate_pause(struct phy_device *phydev, 2621 struct ethtool_pauseparam *pp) 2622 { 2623 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2624 phydev->supported) && pp->rx_pause) 2625 return false; 2626 2627 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2628 phydev->supported) && 2629 pp->rx_pause != pp->tx_pause) 2630 return false; 2631 2632 return true; 2633 } 2634 EXPORT_SYMBOL(phy_validate_pause); 2635 2636 /** 2637 * phy_get_pause - resolve negotiated pause modes 2638 * @phydev: phy_device struct 2639 * @tx_pause: pointer to bool to indicate whether transmit pause should be 2640 * enabled. 2641 * @rx_pause: pointer to bool to indicate whether receive pause should be 2642 * enabled. 2643 * 2644 * Resolve and return the flow control modes according to the negotiation 2645 * result. This includes checking that we are operating in full duplex mode. 2646 * See linkmode_resolve_pause() for further details. 2647 */ 2648 void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause) 2649 { 2650 if (phydev->duplex != DUPLEX_FULL) { 2651 *tx_pause = false; 2652 *rx_pause = false; 2653 return; 2654 } 2655 2656 return linkmode_resolve_pause(phydev->advertising, 2657 phydev->lp_advertising, 2658 tx_pause, rx_pause); 2659 } 2660 EXPORT_SYMBOL(phy_get_pause); 2661 2662 static bool phy_drv_supports_irq(struct phy_driver *phydrv) 2663 { 2664 return phydrv->config_intr && phydrv->ack_interrupt; 2665 } 2666 2667 /** 2668 * phy_probe - probe and init a PHY device 2669 * @dev: device to probe and init 2670 * 2671 * Description: Take care of setting up the phy_device structure, 2672 * set the state to READY (the driver's init function should 2673 * set it to STARTING if needed). 2674 */ 2675 static int phy_probe(struct device *dev) 2676 { 2677 struct phy_device *phydev = to_phy_device(dev); 2678 struct device_driver *drv = phydev->mdio.dev.driver; 2679 struct phy_driver *phydrv = to_phy_driver(drv); 2680 int err = 0; 2681 2682 phydev->drv = phydrv; 2683 2684 /* Disable the interrupt if the PHY doesn't support it 2685 * but the interrupt is still a valid one 2686 */ 2687 if (!phy_drv_supports_irq(phydrv) && phy_interrupt_is_valid(phydev)) 2688 phydev->irq = PHY_POLL; 2689 2690 if (phydrv->flags & PHY_IS_INTERNAL) 2691 phydev->is_internal = true; 2692 2693 mutex_lock(&phydev->lock); 2694 2695 if (phydev->drv->probe) { 2696 /* Deassert the reset signal */ 2697 phy_device_reset(phydev, 0); 2698 2699 err = phydev->drv->probe(phydev); 2700 if (err) { 2701 /* Assert the reset signal */ 2702 phy_device_reset(phydev, 1); 2703 goto out; 2704 } 2705 } 2706 2707 /* Start out supporting everything. Eventually, 2708 * a controller will attach, and may modify one 2709 * or both of these values 2710 */ 2711 if (phydrv->features) { 2712 linkmode_copy(phydev->supported, phydrv->features); 2713 } else if (phydrv->get_features) { 2714 err = phydrv->get_features(phydev); 2715 } else if (phydev->is_c45) { 2716 err = genphy_c45_pma_read_abilities(phydev); 2717 } else { 2718 err = genphy_read_abilities(phydev); 2719 } 2720 2721 if (err) 2722 goto out; 2723 2724 if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, 2725 phydev->supported)) 2726 phydev->autoneg = 0; 2727 2728 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, 2729 phydev->supported)) 2730 phydev->is_gigabit_capable = 1; 2731 if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, 2732 phydev->supported)) 2733 phydev->is_gigabit_capable = 1; 2734 2735 of_set_phy_supported(phydev); 2736 phy_advertise_supported(phydev); 2737 2738 /* Get the EEE modes we want to prohibit. We will ask 2739 * the PHY stop advertising these mode later on 2740 */ 2741 of_set_phy_eee_broken(phydev); 2742 2743 /* The Pause Frame bits indicate that the PHY can support passing 2744 * pause frames. During autonegotiation, the PHYs will determine if 2745 * they should allow pause frames to pass. The MAC driver should then 2746 * use that result to determine whether to enable flow control via 2747 * pause frames. 2748 * 2749 * Normally, PHY drivers should not set the Pause bits, and instead 2750 * allow phylib to do that. However, there may be some situations 2751 * (e.g. hardware erratum) where the driver wants to set only one 2752 * of these bits. 2753 */ 2754 if (!test_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported) && 2755 !test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported)) { 2756 linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, 2757 phydev->supported); 2758 linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, 2759 phydev->supported); 2760 } 2761 2762 /* Set the state to READY by default */ 2763 phydev->state = PHY_READY; 2764 2765 out: 2766 mutex_unlock(&phydev->lock); 2767 2768 return err; 2769 } 2770 2771 static int phy_remove(struct device *dev) 2772 { 2773 struct phy_device *phydev = to_phy_device(dev); 2774 2775 cancel_delayed_work_sync(&phydev->state_queue); 2776 2777 mutex_lock(&phydev->lock); 2778 phydev->state = PHY_DOWN; 2779 mutex_unlock(&phydev->lock); 2780 2781 sfp_bus_del_upstream(phydev->sfp_bus); 2782 phydev->sfp_bus = NULL; 2783 2784 if (phydev->drv && phydev->drv->remove) { 2785 phydev->drv->remove(phydev); 2786 2787 /* Assert the reset signal */ 2788 phy_device_reset(phydev, 1); 2789 } 2790 phydev->drv = NULL; 2791 2792 return 0; 2793 } 2794 2795 /** 2796 * phy_driver_register - register a phy_driver with the PHY layer 2797 * @new_driver: new phy_driver to register 2798 * @owner: module owning this PHY 2799 */ 2800 int phy_driver_register(struct phy_driver *new_driver, struct module *owner) 2801 { 2802 int retval; 2803 2804 /* Either the features are hard coded, or dynamically 2805 * determined. It cannot be both. 2806 */ 2807 if (WARN_ON(new_driver->features && new_driver->get_features)) { 2808 pr_err("%s: features and get_features must not both be set\n", 2809 new_driver->name); 2810 return -EINVAL; 2811 } 2812 2813 new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY; 2814 new_driver->mdiodrv.driver.name = new_driver->name; 2815 new_driver->mdiodrv.driver.bus = &mdio_bus_type; 2816 new_driver->mdiodrv.driver.probe = phy_probe; 2817 new_driver->mdiodrv.driver.remove = phy_remove; 2818 new_driver->mdiodrv.driver.owner = owner; 2819 new_driver->mdiodrv.driver.probe_type = PROBE_FORCE_SYNCHRONOUS; 2820 2821 retval = driver_register(&new_driver->mdiodrv.driver); 2822 if (retval) { 2823 pr_err("%s: Error %d in registering driver\n", 2824 new_driver->name, retval); 2825 2826 return retval; 2827 } 2828 2829 pr_debug("%s: Registered new driver\n", new_driver->name); 2830 2831 return 0; 2832 } 2833 EXPORT_SYMBOL(phy_driver_register); 2834 2835 int phy_drivers_register(struct phy_driver *new_driver, int n, 2836 struct module *owner) 2837 { 2838 int i, ret = 0; 2839 2840 for (i = 0; i < n; i++) { 2841 ret = phy_driver_register(new_driver + i, owner); 2842 if (ret) { 2843 while (i-- > 0) 2844 phy_driver_unregister(new_driver + i); 2845 break; 2846 } 2847 } 2848 return ret; 2849 } 2850 EXPORT_SYMBOL(phy_drivers_register); 2851 2852 void phy_driver_unregister(struct phy_driver *drv) 2853 { 2854 driver_unregister(&drv->mdiodrv.driver); 2855 } 2856 EXPORT_SYMBOL(phy_driver_unregister); 2857 2858 void phy_drivers_unregister(struct phy_driver *drv, int n) 2859 { 2860 int i; 2861 2862 for (i = 0; i < n; i++) 2863 phy_driver_unregister(drv + i); 2864 } 2865 EXPORT_SYMBOL(phy_drivers_unregister); 2866 2867 static struct phy_driver genphy_driver = { 2868 .phy_id = 0xffffffff, 2869 .phy_id_mask = 0xffffffff, 2870 .name = "Generic PHY", 2871 .get_features = genphy_read_abilities, 2872 .suspend = genphy_suspend, 2873 .resume = genphy_resume, 2874 .set_loopback = genphy_loopback, 2875 }; 2876 2877 static int __init phy_init(void) 2878 { 2879 int rc; 2880 2881 rc = mdio_bus_init(); 2882 if (rc) 2883 return rc; 2884 2885 features_init(); 2886 2887 rc = phy_driver_register(&genphy_c45_driver, THIS_MODULE); 2888 if (rc) 2889 goto err_c45; 2890 2891 rc = phy_driver_register(&genphy_driver, THIS_MODULE); 2892 if (rc) { 2893 phy_driver_unregister(&genphy_c45_driver); 2894 err_c45: 2895 mdio_bus_exit(); 2896 } 2897 2898 return rc; 2899 } 2900 2901 static void __exit phy_exit(void) 2902 { 2903 phy_driver_unregister(&genphy_c45_driver); 2904 phy_driver_unregister(&genphy_driver); 2905 mdio_bus_exit(); 2906 } 2907 2908 subsys_initcall(phy_init); 2909 module_exit(phy_exit); 2910