drivers/net/phy/phy.c

   1 /* Framework for configuring and reading PHY devices
   2  * Based on code in sungem_phy.c and gianfar_phy.c
   3  *
   4  * Author: Andy Fleming
   5  *
   6  * Copyright (c) 2004 Freescale Semiconductor, Inc.
   7  * Copyright (c) 2006, 2007  Maciej W. Rozycki
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/kernel.h>
  19 #include <linux/string.h>
  20 #include <linux/errno.h>
  21 #include <linux/unistd.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/delay.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mii.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/phy.h>
  32 #include <linux/phy_led_triggers.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/mdio.h>
  35 #include <linux/io.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/atomic.h>
  38
  39 #include <asm/irq.h>
  40
  41 #define PHY_STATE_STR(_state)                   \
  42         case PHY_##_state:                      \
  43                 return __stringify(_state);     \
  44
  45 static const char *phy_state_to_str(enum phy_state st)
  46 {
  47         switch (st) {
  48         PHY_STATE_STR(DOWN)
  49         PHY_STATE_STR(READY)
  50         PHY_STATE_STR(UP)
  51         PHY_STATE_STR(RUNNING)
  52         PHY_STATE_STR(NOLINK)
  53         PHY_STATE_STR(FORCING)
  54         PHY_STATE_STR(CHANGELINK)
  55         PHY_STATE_STR(HALTED)
  56         PHY_STATE_STR(RESUMING)
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static void phy_link_up(struct phy_device *phydev)
  63 {
  64         phydev->phy_link_change(phydev, true, true);
  65         phy_led_trigger_change_speed(phydev);
  66 }
  67
  68 static void phy_link_down(struct phy_device *phydev, bool do_carrier)
  69 {
  70         phydev->phy_link_change(phydev, false, do_carrier);
  71         phy_led_trigger_change_speed(phydev);
  72 }
  73
  74 /**
  75  * phy_print_status - Convenience function to print out the current phy status
  76  * @phydev: the phy_device struct
  77  */
  78 void phy_print_status(struct phy_device *phydev)
  79 {
  80         if (phydev->link) {
  81                 netdev_info(phydev->attached_dev,
  82                         "Link is Up - %s/%s - flow control %s\n",
  83                         phy_speed_to_str(phydev->speed),
  84                         phy_duplex_to_str(phydev->duplex),
  85                         phydev->pause ? "rx/tx" : "off");
  86         } else  {
  87                 netdev_info(phydev->attached_dev, "Link is Down\n");
  88         }
  89 }
  90 EXPORT_SYMBOL(phy_print_status);
  91
  92 /**
  93  * phy_clear_interrupt - Ack the phy device's interrupt
  94  * @phydev: the phy_device struct
  95  *
  96  * If the @phydev driver has an ack_interrupt function, call it to
  97  * ack and clear the phy device's interrupt.
  98  *
  99  * Returns 0 on success or < 0 on error.
 100  */
 101 static int phy_clear_interrupt(struct phy_device *phydev)
 102 {
 103         if (phydev->drv->ack_interrupt)
 104                 return phydev->drv->ack_interrupt(phydev);
 105
 106         return 0;
 107 }
 108
 109 /**
 110  * phy_config_interrupt - configure the PHY device for the requested interrupts
 111  * @phydev: the phy_device struct
 112  * @interrupts: interrupt flags to configure for this @phydev
 113  *
 114  * Returns 0 on success or < 0 on error.
 115  */
 116 static int phy_config_interrupt(struct phy_device *phydev, bool interrupts)
 117 {
 118         phydev->interrupts = interrupts ? 1 : 0;
 119         if (phydev->drv->config_intr)
 120                 return phydev->drv->config_intr(phydev);
 121
 122         return 0;
 123 }
 124
 125 /**
 126  * phy_restart_aneg - restart auto-negotiation
 127  * @phydev: target phy_device struct
 128  *
 129  * Restart the autonegotiation on @phydev.  Returns >= 0 on success or
 130  * negative errno on error.
 131  */
 132 int phy_restart_aneg(struct phy_device *phydev)
 133 {
 134         int ret;
 135
 136         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 137                 ret = genphy_c45_restart_aneg(phydev);
 138         else
 139                 ret = genphy_restart_aneg(phydev);
 140
 141         return ret;
 142 }
 143 EXPORT_SYMBOL_GPL(phy_restart_aneg);
 144
 145 /**
 146  * phy_aneg_done - return auto-negotiation status
 147  * @phydev: target phy_device struct
 148  *
 149  * Description: Return the auto-negotiation status from this @phydev
 150  * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation
 151  * is still pending.
 152  */
 153 int phy_aneg_done(struct phy_device *phydev)
 154 {
 155         if (phydev->drv && phydev->drv->aneg_done)
 156                 return phydev->drv->aneg_done(phydev);
 157
 158         /* Avoid genphy_aneg_done() if the Clause 45 PHY does not
 159          * implement Clause 22 registers
 160          */
 161         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 162                 return -EINVAL;
 163
 164         return genphy_aneg_done(phydev);
 165 }
 166 EXPORT_SYMBOL(phy_aneg_done);
 167
 168 /**
 169  * phy_find_valid - find a PHY setting that matches the requested parameters
 170  * @speed: desired speed
 171  * @duplex: desired duplex
 172  * @supported: mask of supported link modes
 173  *
 174  * Locate a supported phy setting that is, in priority order:
 175  * - an exact match for the specified speed and duplex mode
 176  * - a match for the specified speed, or slower speed
 177  * - the slowest supported speed
 178  * Returns the matched phy_setting entry, or %NULL if no supported phy
 179  * settings were found.
 180  */
 181 static const struct phy_setting *
 182 phy_find_valid(int speed, int duplex, unsigned long *supported)
 183 {
 184         return phy_lookup_setting(speed, duplex, supported, false);
 185 }
 186
 187 /**
 188  * phy_supported_speeds - return all speeds currently supported by a phy device
 189  * @phy: The phy device to return supported speeds of.
 190  * @speeds: buffer to store supported speeds in.
 191  * @size:   size of speeds buffer.
 192  *
 193  * Description: Returns the number of supported speeds, and fills the speeds
 194  * buffer with the supported speeds. If speeds buffer is too small to contain
 195  * all currently supported speeds, will return as many speeds as can fit.
 196  */
 197 unsigned int phy_supported_speeds(struct phy_device *phy,
 198                                   unsigned int *speeds,
 199                                   unsigned int size)
 200 {
 201         return phy_speeds(speeds, size, phy->supported);
 202 }
 203
 204 /**
 205  * phy_check_valid - check if there is a valid PHY setting which matches
 206  *                   speed, duplex, and feature mask
 207  * @speed: speed to match
 208  * @duplex: duplex to match
 209  * @features: A mask of the valid settings
 210  *
 211  * Description: Returns true if there is a valid setting, false otherwise.
 212  */
 213 static inline bool phy_check_valid(int speed, int duplex,
 214                                    unsigned long *features)
 215 {
 216         return !!phy_lookup_setting(speed, duplex, features, true);
 217 }
 218
 219 /**
 220  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 221  * @phydev: the target phy_device struct
 222  *
 223  * Description: Make sure the PHY is set to supported speeds and
 224  *   duplexes.  Drop down by one in this order:  1000/FULL,
 225  *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 226  */
 227 static void phy_sanitize_settings(struct phy_device *phydev)
 228 {
 229         const struct phy_setting *setting;
 230
 231         /* Sanitize settings based on PHY capabilities */
 232         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported))
 233                 phydev->autoneg = AUTONEG_DISABLE;
 234
 235         setting = phy_find_valid(phydev->speed, phydev->duplex,
 236                                  phydev->supported);
 237         if (setting) {
 238                 phydev->speed = setting->speed;
 239                 phydev->duplex = setting->duplex;
 240         } else {
 241                 /* We failed to find anything (no supported speeds?) */
 242                 phydev->speed = SPEED_UNKNOWN;
 243                 phydev->duplex = DUPLEX_UNKNOWN;
 244         }
 245 }
 246
 247 /**
 248  * phy_ethtool_sset - generic ethtool sset function, handles all the details
 249  * @phydev: target phy_device struct
 250  * @cmd: ethtool_cmd
 251  *
 252  * A few notes about parameter checking:
 253  *
 254  * - We don't set port or transceiver, so we don't care what they
 255  *   were set to.
 256  * - phy_start_aneg() will make sure forced settings are sane, and
 257  *   choose the next best ones from the ones selected, so we don't
 258  *   care if ethtool tries to give us bad values.
 259  */
 260 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 261 {
 262         __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
 263         u32 speed = ethtool_cmd_speed(cmd);
 264
 265         if (cmd->phy_address != phydev->mdio.addr)
 266                 return -EINVAL;
 267
 268         /* We make sure that we don't pass unsupported values in to the PHY */
 269         ethtool_convert_legacy_u32_to_link_mode(advertising, cmd->advertising);
 270         linkmode_and(advertising, advertising, phydev->supported);
 271
 272         /* Verify the settings we care about. */
 273         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 274                 return -EINVAL;
 275
 276         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 277                 return -EINVAL;
 278
 279         if (cmd->autoneg == AUTONEG_DISABLE &&
 280             ((speed != SPEED_1000 &&
 281               speed != SPEED_100 &&
 282               speed != SPEED_10) ||
 283              (cmd->duplex != DUPLEX_HALF &&
 284               cmd->duplex != DUPLEX_FULL)))
 285                 return -EINVAL;
 286
 287         phydev->autoneg = cmd->autoneg;
 288
 289         phydev->speed = speed;
 290
 291         linkmode_copy(phydev->advertising, advertising);
 292
 293         if (AUTONEG_ENABLE == cmd->autoneg)
 294                 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 295                                  phydev->advertising);
 296         else
 297                 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 298                                    phydev->advertising);
 299
 300         phydev->duplex = cmd->duplex;
 301
 302         phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl;
 303
 304         /* Restart the PHY */
 305         phy_start_aneg(phydev);
 306
 307         return 0;
 308 }
 309 EXPORT_SYMBOL(phy_ethtool_sset);
 310
 311 int phy_ethtool_ksettings_set(struct phy_device *phydev,
 312                               const struct ethtool_link_ksettings *cmd)
 313 {
 314         __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
 315         u8 autoneg = cmd->base.autoneg;
 316         u8 duplex = cmd->base.duplex;
 317         u32 speed = cmd->base.speed;
 318
 319         if (cmd->base.phy_address != phydev->mdio.addr)
 320                 return -EINVAL;
 321
 322         linkmode_copy(advertising, cmd->link_modes.advertising);
 323
 324         /* We make sure that we don't pass unsupported values in to the PHY */
 325         linkmode_and(advertising, advertising, phydev->supported);
 326
 327         /* Verify the settings we care about. */
 328         if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
 329                 return -EINVAL;
 330
 331         if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
 332                 return -EINVAL;
 333
 334         if (autoneg == AUTONEG_DISABLE &&
 335             ((speed != SPEED_1000 &&
 336               speed != SPEED_100 &&
 337               speed != SPEED_10) ||
 338              (duplex != DUPLEX_HALF &&
 339               duplex != DUPLEX_FULL)))
 340                 return -EINVAL;
 341
 342         phydev->autoneg = autoneg;
 343
 344         phydev->speed = speed;
 345
 346         linkmode_copy(phydev->advertising, advertising);
 347
 348         if (autoneg == AUTONEG_ENABLE)
 349                 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 350                                  phydev->advertising);
 351         else
 352                 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 353                                    phydev->advertising);
 354
 355         phydev->duplex = duplex;
 356
 357         phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 358
 359         /* Restart the PHY */
 360         phy_start_aneg(phydev);
 361
 362         return 0;
 363 }
 364 EXPORT_SYMBOL(phy_ethtool_ksettings_set);
 365
 366 void phy_ethtool_ksettings_get(struct phy_device *phydev,
 367                                struct ethtool_link_ksettings *cmd)
 368 {
 369         linkmode_copy(cmd->link_modes.supported, phydev->supported);
 370         linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
 371         linkmode_copy(cmd->link_modes.lp_advertising, phydev->lp_advertising);
 372
 373         cmd->base.speed = phydev->speed;
 374         cmd->base.duplex = phydev->duplex;
 375         if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 376                 cmd->base.port = PORT_BNC;
 377         else
 378                 cmd->base.port = PORT_MII;
 379         cmd->base.transceiver = phy_is_internal(phydev) ?
 380                                 XCVR_INTERNAL : XCVR_EXTERNAL;
 381         cmd->base.phy_address = phydev->mdio.addr;
 382         cmd->base.autoneg = phydev->autoneg;
 383         cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl;
 384         cmd->base.eth_tp_mdix = phydev->mdix;
 385 }
 386 EXPORT_SYMBOL(phy_ethtool_ksettings_get);
 387
 388 /**
 389  * phy_mii_ioctl - generic PHY MII ioctl interface
 390  * @phydev: the phy_device struct
 391  * @ifr: &struct ifreq for socket ioctl's
 392  * @cmd: ioctl cmd to execute
 393  *
 394  * Note that this function is currently incompatible with the
 395  * PHYCONTROL layer.  It changes registers without regard to
 396  * current state.  Use at own risk.
 397  */
 398 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 399 {
 400         struct mii_ioctl_data *mii_data = if_mii(ifr);
 401         u16 val = mii_data->val_in;
 402         bool change_autoneg = false;
 403
 404         switch (cmd) {
 405         case SIOCGMIIPHY:
 406                 mii_data->phy_id = phydev->mdio.addr;
 407                 /* fall through */
 408
 409         case SIOCGMIIREG:
 410                 mii_data->val_out = mdiobus_read(phydev->mdio.bus,
 411                                                  mii_data->phy_id,
 412                                                  mii_data->reg_num);
 413                 return 0;
 414
 415         case SIOCSMIIREG:
 416                 if (mii_data->phy_id == phydev->mdio.addr) {
 417                         switch (mii_data->reg_num) {
 418                         case MII_BMCR:
 419                                 if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) {
 420                                         if (phydev->autoneg == AUTONEG_ENABLE)
 421                                                 change_autoneg = true;
 422                                         phydev->autoneg = AUTONEG_DISABLE;
 423                                         if (val & BMCR_FULLDPLX)
 424                                                 phydev->duplex = DUPLEX_FULL;
 425                                         else
 426                                                 phydev->duplex = DUPLEX_HALF;
 427                                         if (val & BMCR_SPEED1000)
 428                                                 phydev->speed = SPEED_1000;
 429                                         else if (val & BMCR_SPEED100)
 430                                                 phydev->speed = SPEED_100;
 431                                         else phydev->speed = SPEED_10;
 432                                 }
 433                                 else {
 434                                         if (phydev->autoneg == AUTONEG_DISABLE)
 435                                                 change_autoneg = true;
 436                                         phydev->autoneg = AUTONEG_ENABLE;
 437                                 }
 438                                 break;
 439                         case MII_ADVERTISE:
 440                                 mii_adv_mod_linkmode_adv_t(phydev->advertising,
 441                                                            val);
 442                                 change_autoneg = true;
 443                                 break;
 444                         default:
 445                                 /* do nothing */
 446                                 break;
 447                         }
 448                 }
 449
 450                 mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
 451                               mii_data->reg_num, val);
 452
 453                 if (mii_data->phy_id == phydev->mdio.addr &&
 454                     mii_data->reg_num == MII_BMCR &&
 455                     val & BMCR_RESET)
 456                         return phy_init_hw(phydev);
 457
 458                 if (change_autoneg)
 459                         return phy_start_aneg(phydev);
 460
 461                 return 0;
 462
 463         case SIOCSHWTSTAMP:
 464                 if (phydev->drv && phydev->drv->hwtstamp)
 465                         return phydev->drv->hwtstamp(phydev, ifr);
 466                 /* fall through */
 467
 468         default:
 469                 return -EOPNOTSUPP;
 470         }
 471 }
 472 EXPORT_SYMBOL(phy_mii_ioctl);
 473
 474 static void phy_queue_state_machine(struct phy_device *phydev,
 475                                     unsigned int secs)
 476 {
 477         mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
 478                          secs * HZ);
 479 }
 480
 481 static void phy_trigger_machine(struct phy_device *phydev)
 482 {
 483         phy_queue_state_machine(phydev, 0);
 484 }
 485
 486 static int phy_config_aneg(struct phy_device *phydev)
 487 {
 488         if (phydev->drv->config_aneg)
 489                 return phydev->drv->config_aneg(phydev);
 490
 491         /* Clause 45 PHYs that don't implement Clause 22 registers are not
 492          * allowed to call genphy_config_aneg()
 493          */
 494         if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
 495                 return -EOPNOTSUPP;
 496
 497         return genphy_config_aneg(phydev);
 498 }
 499
 500 /**
 501  * phy_check_link_status - check link status and set state accordingly
 502  * @phydev: the phy_device struct
 503  *
 504  * Description: Check for link and whether autoneg was triggered / is running
 505  * and set state accordingly
 506  */
 507 static int phy_check_link_status(struct phy_device *phydev)
 508 {
 509         int err;
 510
 511         WARN_ON(!mutex_is_locked(&phydev->lock));
 512
 513         err = phy_read_status(phydev);
 514         if (err)
 515                 return err;
 516
 517         if (phydev->link && phydev->state != PHY_RUNNING) {
 518                 phydev->state = PHY_RUNNING;
 519                 phy_link_up(phydev);
 520         } else if (!phydev->link && phydev->state != PHY_NOLINK) {
 521                 phydev->state = PHY_NOLINK;
 522                 phy_link_down(phydev, true);
 523         }
 524
 525         return 0;
 526 }
 527
 528 /**
 529  * phy_start_aneg - start auto-negotiation for this PHY device
 530  * @phydev: the phy_device struct
 531  *
 532  * Description: Sanitizes the settings (if we're not autonegotiating
 533  *   them), and then calls the driver's config_aneg function.
 534  *   If the PHYCONTROL Layer is operating, we change the state to
 535  *   reflect the beginning of Auto-negotiation or forcing.
 536  */
 537 int phy_start_aneg(struct phy_device *phydev)
 538 {
 539         int err;
 540
 541         if (!phydev->drv)
 542                 return -EIO;
 543
 544         mutex_lock(&phydev->lock);
 545
 546         if (!__phy_is_started(phydev)) {
 547                 WARN(1, "called from state %s\n",
 548                      phy_state_to_str(phydev->state));
 549                 err = -EBUSY;
 550                 goto out_unlock;
 551         }
 552
 553         if (AUTONEG_DISABLE == phydev->autoneg)
 554                 phy_sanitize_settings(phydev);
 555
 556         /* Invalidate LP advertising flags */
 557         linkmode_zero(phydev->lp_advertising);
 558
 559         err = phy_config_aneg(phydev);
 560         if (err < 0)
 561                 goto out_unlock;
 562
 563         if (phydev->autoneg == AUTONEG_ENABLE) {
 564                 err = phy_check_link_status(phydev);
 565         } else {
 566                 phydev->state = PHY_FORCING;
 567                 phydev->link_timeout = PHY_FORCE_TIMEOUT;
 568         }
 569
 570 out_unlock:
 571         mutex_unlock(&phydev->lock);
 572
 573         return err;
 574 }
 575 EXPORT_SYMBOL(phy_start_aneg);
 576
 577 static int phy_poll_aneg_done(struct phy_device *phydev)
 578 {
 579         unsigned int retries = 100;
 580         int ret;
 581
 582         do {
 583                 msleep(100);
 584                 ret = phy_aneg_done(phydev);
 585         } while (!ret && --retries);
 586
 587         if (!ret)
 588                 return -ETIMEDOUT;
 589
 590         return ret < 0 ? ret : 0;
 591 }
 592
 593 /**
 594  * phy_speed_down - set speed to lowest speed supported by both link partners
 595  * @phydev: the phy_device struct
 596  * @sync: perform action synchronously
 597  *
 598  * Description: Typically used to save energy when waiting for a WoL packet
 599  *
 600  * WARNING: Setting sync to false may cause the system being unable to suspend
 601  * in case the PHY generates an interrupt when finishing the autonegotiation.
 602  * This interrupt may wake up the system immediately after suspend.
 603  * Therefore use sync = false only if you're sure it's safe with the respective
 604  * network chip.
 605  */
 606 int phy_speed_down(struct phy_device *phydev, bool sync)
 607 {
 608         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 609         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
 610         int ret;
 611
 612         if (phydev->autoneg != AUTONEG_ENABLE)
 613                 return 0;
 614
 615         linkmode_copy(adv_old, phydev->advertising);
 616         linkmode_copy(adv, phydev->lp_advertising);
 617         linkmode_and(adv, adv, phydev->supported);
 618
 619         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, adv) ||
 620             linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, adv)) {
 621                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 622                                    phydev->advertising);
 623                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 624                                    phydev->advertising);
 625                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 626                                    phydev->advertising);
 627                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 628                                    phydev->advertising);
 629         } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 630                                      adv) ||
 631                    linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 632                                      adv)) {
 633                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 634                                    phydev->advertising);
 635                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 636                                    phydev->advertising);
 637         }
 638
 639         if (linkmode_equal(phydev->advertising, adv_old))
 640                 return 0;
 641
 642         ret = phy_config_aneg(phydev);
 643         if (ret)
 644                 return ret;
 645
 646         return sync ? phy_poll_aneg_done(phydev) : 0;
 647 }
 648 EXPORT_SYMBOL_GPL(phy_speed_down);
 649
 650 /**
 651  * phy_speed_up - (re)set advertised speeds to all supported speeds
 652  * @phydev: the phy_device struct
 653  *
 654  * Description: Used to revert the effect of phy_speed_down
 655  */
 656 int phy_speed_up(struct phy_device *phydev)
 657 {
 658         __ETHTOOL_DECLARE_LINK_MODE_MASK(all_speeds) = { 0, };
 659         __ETHTOOL_DECLARE_LINK_MODE_MASK(not_speeds);
 660         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 661         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 662         __ETHTOOL_DECLARE_LINK_MODE_MASK(speeds);
 663
 664         linkmode_copy(adv_old, phydev->advertising);
 665
 666         if (phydev->autoneg != AUTONEG_ENABLE)
 667                 return 0;
 668
 669         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, all_speeds);
 670         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, all_speeds);
 671         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, all_speeds);
 672         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, all_speeds);
 673         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, all_speeds);
 674         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, all_speeds);
 675
 676         linkmode_andnot(not_speeds, adv_old, all_speeds);
 677         linkmode_copy(supported, phydev->supported);
 678         linkmode_and(speeds, supported, all_speeds);
 679         linkmode_or(phydev->advertising, not_speeds, speeds);
 680
 681         if (linkmode_equal(phydev->advertising, adv_old))
 682                 return 0;
 683
 684         return phy_config_aneg(phydev);
 685 }
 686 EXPORT_SYMBOL_GPL(phy_speed_up);
 687
 688 /**
 689  * phy_start_machine - start PHY state machine tracking
 690  * @phydev: the phy_device struct
 691  *
 692  * Description: The PHY infrastructure can run a state machine
 693  *   which tracks whether the PHY is starting up, negotiating,
 694  *   etc.  This function starts the delayed workqueue which tracks
 695  *   the state of the PHY. If you want to maintain your own state machine,
 696  *   do not call this function.
 697  */
 698 void phy_start_machine(struct phy_device *phydev)
 699 {
 700         phy_trigger_machine(phydev);
 701 }
 702 EXPORT_SYMBOL_GPL(phy_start_machine);
 703
 704 /**
 705  * phy_stop_machine - stop the PHY state machine tracking
 706  * @phydev: target phy_device struct
 707  *
 708  * Description: Stops the state machine delayed workqueue, sets the
 709  *   state to UP (unless it wasn't up yet). This function must be
 710  *   called BEFORE phy_detach.
 711  */
 712 void phy_stop_machine(struct phy_device *phydev)
 713 {
 714         cancel_delayed_work_sync(&phydev->state_queue);
 715
 716         mutex_lock(&phydev->lock);
 717         if (__phy_is_started(phydev))
 718                 phydev->state = PHY_UP;
 719         mutex_unlock(&phydev->lock);
 720 }
 721
 722 /**
 723  * phy_error - enter HALTED state for this PHY device
 724  * @phydev: target phy_device struct
 725  *
 726  * Moves the PHY to the HALTED state in response to a read
 727  * or write error, and tells the controller the link is down.
 728  * Must not be called from interrupt context, or while the
 729  * phydev->lock is held.
 730  */
 731 static void phy_error(struct phy_device *phydev)
 732 {
 733         WARN_ON(1);
 734
 735         mutex_lock(&phydev->lock);
 736         phydev->state = PHY_HALTED;
 737         mutex_unlock(&phydev->lock);
 738
 739         phy_trigger_machine(phydev);
 740 }
 741
 742 /**
 743  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 744  * @phydev: target phy_device struct
 745  */
 746 static int phy_disable_interrupts(struct phy_device *phydev)
 747 {
 748         int err;
 749
 750         /* Disable PHY interrupts */
 751         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 752         if (err)
 753                 return err;
 754
 755         /* Clear the interrupt */
 756         return phy_clear_interrupt(phydev);
 757 }
 758
 759 /**
 760  * phy_interrupt - PHY interrupt handler
 761  * @irq: interrupt line
 762  * @phy_dat: phy_device pointer
 763  *
 764  * Description: Handle PHY interrupt
 765  */
 766 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 767 {
 768         struct phy_device *phydev = phy_dat;
 769
 770         if (!phy_is_started(phydev))
 771                 return IRQ_NONE;                /* It can't be ours.  */
 772
 773         if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
 774                 return IRQ_NONE;
 775
 776         /* reschedule state queue work to run as soon as possible */
 777         phy_trigger_machine(phydev);
 778
 779         if (phy_clear_interrupt(phydev))
 780                 goto phy_err;
 781         return IRQ_HANDLED;
 782
 783 phy_err:
 784         phy_error(phydev);
 785         return IRQ_NONE;
 786 }
 787
 788 /**
 789  * phy_enable_interrupts - Enable the interrupts from the PHY side
 790  * @phydev: target phy_device struct
 791  */
 792 static int phy_enable_interrupts(struct phy_device *phydev)
 793 {
 794         int err = phy_clear_interrupt(phydev);
 795
 796         if (err < 0)
 797                 return err;
 798
 799         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 800 }
 801
 802 /**
 803  * phy_start_interrupts - request and enable interrupts for a PHY device
 804  * @phydev: target phy_device struct
 805  *
 806  * Description: Request the interrupt for the given PHY.
 807  *   If this fails, then we set irq to PHY_POLL.
 808  *   Otherwise, we enable the interrupts in the PHY.
 809  *   This should only be called with a valid IRQ number.
 810  *   Returns 0 on success or < 0 on error.
 811  */
 812 int phy_start_interrupts(struct phy_device *phydev)
 813 {
 814         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 815                                  IRQF_ONESHOT | IRQF_SHARED,
 816                                  phydev_name(phydev), phydev) < 0) {
 817                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 818                         phydev->mdio.bus->name, phydev->irq);
 819                 phydev->irq = PHY_POLL;
 820                 return 0;
 821         }
 822
 823         return phy_enable_interrupts(phydev);
 824 }
 825 EXPORT_SYMBOL(phy_start_interrupts);
 826
 827 /**
 828  * phy_stop_interrupts - disable interrupts from a PHY device
 829  * @phydev: target phy_device struct
 830  */
 831 int phy_stop_interrupts(struct phy_device *phydev)
 832 {
 833         int err = phy_disable_interrupts(phydev);
 834
 835         if (err)
 836                 phy_error(phydev);
 837
 838         free_irq(phydev->irq, phydev);
 839
 840         return err;
 841 }
 842 EXPORT_SYMBOL(phy_stop_interrupts);
 843
 844 /**
 845  * phy_stop - Bring down the PHY link, and stop checking the status
 846  * @phydev: target phy_device struct
 847  */
 848 void phy_stop(struct phy_device *phydev)
 849 {
 850         mutex_lock(&phydev->lock);
 851
 852         if (!__phy_is_started(phydev)) {
 853                 WARN(1, "called from state %s\n",
 854                      phy_state_to_str(phydev->state));
 855                 mutex_unlock(&phydev->lock);
 856                 return;
 857         }
 858
 859         if (phy_interrupt_is_valid(phydev))
 860                 phy_disable_interrupts(phydev);
 861
 862         phydev->state = PHY_HALTED;
 863
 864         mutex_unlock(&phydev->lock);
 865
 866         phy_state_machine(&phydev->state_queue.work);
 867
 868         /* Cannot call flush_scheduled_work() here as desired because
 869          * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
 870          * will not reenable interrupts.
 871          */
 872 }
 873 EXPORT_SYMBOL(phy_stop);
 874
 875 /**
 876  * phy_start - start or restart a PHY device
 877  * @phydev: target phy_device struct
 878  *
 879  * Description: Indicates the attached device's readiness to
 880  *   handle PHY-related work.  Used during startup to start the
 881  *   PHY, and after a call to phy_stop() to resume operation.
 882  *   Also used to indicate the MDIO bus has cleared an error
 883  *   condition.
 884  */
 885 void phy_start(struct phy_device *phydev)
 886 {
 887         int err = 0;
 888
 889         mutex_lock(&phydev->lock);
 890
 891         switch (phydev->state) {
 892         case PHY_READY:
 893                 phydev->state = PHY_UP;
 894                 break;
 895         case PHY_HALTED:
 896                 /* if phy was suspended, bring the physical link up again */
 897                 __phy_resume(phydev);
 898
 899                 /* make sure interrupts are re-enabled for the PHY */
 900                 if (phy_interrupt_is_valid(phydev)) {
 901                         err = phy_enable_interrupts(phydev);
 902                         if (err < 0)
 903                                 break;
 904                 }
 905
 906                 phydev->state = PHY_RESUMING;
 907                 break;
 908         default:
 909                 break;
 910         }
 911         mutex_unlock(&phydev->lock);
 912
 913         phy_trigger_machine(phydev);
 914 }
 915 EXPORT_SYMBOL(phy_start);
 916
 917 /**
 918  * phy_state_machine - Handle the state machine
 919  * @work: work_struct that describes the work to be done
 920  */
 921 void phy_state_machine(struct work_struct *work)
 922 {
 923         struct delayed_work *dwork = to_delayed_work(work);
 924         struct phy_device *phydev =
 925                         container_of(dwork, struct phy_device, state_queue);
 926         bool needs_aneg = false, do_suspend = false;
 927         enum phy_state old_state;
 928         int err = 0;
 929
 930         mutex_lock(&phydev->lock);
 931
 932         old_state = phydev->state;
 933
 934         if (phydev->drv && phydev->drv->link_change_notify)
 935                 phydev->drv->link_change_notify(phydev);
 936
 937         switch (phydev->state) {
 938         case PHY_DOWN:
 939         case PHY_READY:
 940                 break;
 941         case PHY_UP:
 942                 needs_aneg = true;
 943
 944                 break;
 945         case PHY_NOLINK:
 946         case PHY_RUNNING:
 947         case PHY_CHANGELINK:
 948         case PHY_RESUMING:
 949                 err = phy_check_link_status(phydev);
 950                 break;
 951         case PHY_FORCING:
 952                 err = genphy_update_link(phydev);
 953                 if (err)
 954                         break;
 955
 956                 if (phydev->link) {
 957                         phydev->state = PHY_RUNNING;
 958                         phy_link_up(phydev);
 959                 } else {
 960                         if (0 == phydev->link_timeout--)
 961                                 needs_aneg = true;
 962                         phy_link_down(phydev, false);
 963                 }
 964                 break;
 965         case PHY_HALTED:
 966                 if (phydev->link) {
 967                         phydev->link = 0;
 968                         phy_link_down(phydev, true);
 969                         do_suspend = true;
 970                 }
 971                 break;
 972         }
 973
 974         mutex_unlock(&phydev->lock);
 975
 976         if (needs_aneg)
 977                 err = phy_start_aneg(phydev);
 978         else if (do_suspend)
 979                 phy_suspend(phydev);
 980
 981         if (err < 0)
 982                 phy_error(phydev);
 983
 984         if (old_state != phydev->state)
 985                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
 986                            phy_state_to_str(old_state),
 987                            phy_state_to_str(phydev->state));
 988
 989         /* Only re-schedule a PHY state machine change if we are polling the
 990          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
 991          * between states from phy_mac_interrupt().
 992          *
 993          * In state PHY_HALTED the PHY gets suspended, so rescheduling the
 994          * state machine would be pointless and possibly error prone when
 995          * called from phy_disconnect() synchronously.
 996          */
 997         if (phy_polling_mode(phydev) && phy_is_started(phydev))
 998                 phy_queue_state_machine(phydev, PHY_STATE_TIME);
 999 }
1000
1001 /**
1002  * phy_mac_interrupt - MAC says the link has changed
1003  * @phydev: phy_device struct with changed link
1004  *
1005  * The MAC layer is able to indicate there has been a change in the PHY link
1006  * status. Trigger the state machine and work a work queue.
1007  */
1008 void phy_mac_interrupt(struct phy_device *phydev)
1009 {
1010         /* Trigger a state machine change */
1011         phy_trigger_machine(phydev);
1012 }
1013 EXPORT_SYMBOL(phy_mac_interrupt);
1014
1015 static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
1016 {
1017         linkmode_zero(advertising);
1018
1019         if (eee_adv & MDIO_EEE_100TX)
1020                 linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
1021                                  advertising);
1022         if (eee_adv & MDIO_EEE_1000T)
1023                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
1024                                  advertising);
1025         if (eee_adv & MDIO_EEE_10GT)
1026                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
1027                                  advertising);
1028         if (eee_adv & MDIO_EEE_1000KX)
1029                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
1030                                  advertising);
1031         if (eee_adv & MDIO_EEE_10GKX4)
1032                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
1033                                  advertising);
1034         if (eee_adv & MDIO_EEE_10GKR)
1035                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
1036                                  advertising);
1037 }
1038
1039 /**
1040  * phy_init_eee - init and check the EEE feature
1041  * @phydev: target phy_device struct
1042  * @clk_stop_enable: PHY may stop the clock during LPI
1043  *
1044  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1045  * is supported by looking at the MMD registers 3.20 and 7.60/61
1046  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1047  * bit if required.
1048  */
1049 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1050 {
1051         if (!phydev->drv)
1052                 return -EIO;
1053
1054         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1055          */
1056         if (phydev->duplex == DUPLEX_FULL) {
1057                 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
1058                 __ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
1059                 __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
1060                 int eee_lp, eee_cap, eee_adv;
1061                 int status;
1062                 u32 cap;
1063
1064                 /* Read phy status to properly get the right settings */
1065                 status = phy_read_status(phydev);
1066                 if (status)
1067                         return status;
1068
1069                 /* First check if the EEE ability is supported */
1070                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1071                 if (eee_cap <= 0)
1072                         goto eee_exit_err;
1073
1074                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1075                 if (!cap)
1076                         goto eee_exit_err;
1077
1078                 /* Check which link settings negotiated and verify it in
1079                  * the EEE advertising registers.
1080                  */
1081                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1082                 if (eee_lp <= 0)
1083                         goto eee_exit_err;
1084
1085                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1086                 if (eee_adv <= 0)
1087                         goto eee_exit_err;
1088
1089                 mmd_eee_adv_to_linkmode(adv, eee_adv);
1090                 mmd_eee_adv_to_linkmode(lp, eee_lp);
1091                 linkmode_and(common, adv, lp);
1092
1093                 if (!phy_check_valid(phydev->speed, phydev->duplex, common))
1094                         goto eee_exit_err;
1095
1096                 if (clk_stop_enable) {
1097                         /* Configure the PHY to stop receiving xMII
1098                          * clock while it is signaling LPI.
1099                          */
1100                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1101                         if (val < 0)
1102                                 return val;
1103
1104                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1105                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1106                 }
1107
1108                 return 0; /* EEE supported */
1109         }
1110 eee_exit_err:
1111         return -EPROTONOSUPPORT;
1112 }
1113 EXPORT_SYMBOL(phy_init_eee);
1114
1115 /**
1116  * phy_get_eee_err - report the EEE wake error count
1117  * @phydev: target phy_device struct
1118  *
1119  * Description: it is to report the number of time where the PHY
1120  * failed to complete its normal wake sequence.
1121  */
1122 int phy_get_eee_err(struct phy_device *phydev)
1123 {
1124         if (!phydev->drv)
1125                 return -EIO;
1126
1127         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1128 }
1129 EXPORT_SYMBOL(phy_get_eee_err);
1130
1131 /**
1132  * phy_ethtool_get_eee - get EEE supported and status
1133  * @phydev: target phy_device struct
1134  * @data: ethtool_eee data
1135  *
1136  * Description: it reportes the Supported/Advertisement/LP Advertisement
1137  * capabilities.
1138  */
1139 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1140 {
1141         int val;
1142
1143         if (!phydev->drv)
1144                 return -EIO;
1145
1146         /* Get Supported EEE */
1147         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1148         if (val < 0)
1149                 return val;
1150         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1151
1152         /* Get advertisement EEE */
1153         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1154         if (val < 0)
1155                 return val;
1156         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1157         data->eee_enabled = !!data->advertised;
1158
1159         /* Get LP advertisement EEE */
1160         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1161         if (val < 0)
1162                 return val;
1163         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1164
1165         data->eee_active = !!(data->advertised & data->lp_advertised);
1166
1167         return 0;
1168 }
1169 EXPORT_SYMBOL(phy_ethtool_get_eee);
1170
1171 /**
1172  * phy_ethtool_set_eee - set EEE supported and status
1173  * @phydev: target phy_device struct
1174  * @data: ethtool_eee data
1175  *
1176  * Description: it is to program the Advertisement EEE register.
1177  */
1178 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1179 {
1180         int cap, old_adv, adv = 0, ret;
1181
1182         if (!phydev->drv)
1183                 return -EIO;
1184
1185         /* Get Supported EEE */
1186         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1187         if (cap < 0)
1188                 return cap;
1189
1190         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1191         if (old_adv < 0)
1192                 return old_adv;
1193
1194         if (data->eee_enabled) {
1195                 adv = !data->advertised ? cap :
1196                       ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1197                 /* Mask prohibited EEE modes */
1198                 adv &= ~phydev->eee_broken_modes;
1199         }
1200
1201         if (old_adv != adv) {
1202                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1203                 if (ret < 0)
1204                         return ret;
1205
1206                 /* Restart autonegotiation so the new modes get sent to the
1207                  * link partner.
1208                  */
1209                 ret = phy_restart_aneg(phydev);
1210                 if (ret < 0)
1211                         return ret;
1212         }
1213
1214         return 0;
1215 }
1216 EXPORT_SYMBOL(phy_ethtool_set_eee);
1217
1218 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1219 {
1220         if (phydev->drv && phydev->drv->set_wol)
1221                 return phydev->drv->set_wol(phydev, wol);
1222
1223         return -EOPNOTSUPP;
1224 }
1225 EXPORT_SYMBOL(phy_ethtool_set_wol);
1226
1227 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1228 {
1229         if (phydev->drv && phydev->drv->get_wol)
1230                 phydev->drv->get_wol(phydev, wol);
1231 }
1232 EXPORT_SYMBOL(phy_ethtool_get_wol);
1233
1234 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1235                                    struct ethtool_link_ksettings *cmd)
1236 {
1237         struct phy_device *phydev = ndev->phydev;
1238
1239         if (!phydev)
1240                 return -ENODEV;
1241
1242         phy_ethtool_ksettings_get(phydev, cmd);
1243
1244         return 0;
1245 }
1246 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1247
1248 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1249                                    const struct ethtool_link_ksettings *cmd)
1250 {
1251         struct phy_device *phydev = ndev->phydev;
1252
1253         if (!phydev)
1254                 return -ENODEV;
1255
1256         return phy_ethtool_ksettings_set(phydev, cmd);
1257 }
1258 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1259
1260 int phy_ethtool_nway_reset(struct net_device *ndev)
1261 {
1262         struct phy_device *phydev = ndev->phydev;
1263
1264         if (!phydev)
1265                 return -ENODEV;
1266
1267         if (!phydev->drv)
1268                 return -EIO;
1269
1270         return phy_restart_aneg(phydev);
1271 }
1272 EXPORT_SYMBOL(phy_ethtool_nway_reset);