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 (AUTONEG_DISABLE == phydev->autoneg)
 547                 phy_sanitize_settings(phydev);
 548
 549         /* Invalidate LP advertising flags */
 550         linkmode_zero(phydev->lp_advertising);
 551
 552         err = phy_config_aneg(phydev);
 553         if (err < 0)
 554                 goto out_unlock;
 555
 556         if (__phy_is_started(phydev)) {
 557                 if (phydev->autoneg == AUTONEG_ENABLE) {
 558                         err = phy_check_link_status(phydev);
 559                 } else {
 560                         phydev->state = PHY_FORCING;
 561                         phydev->link_timeout = PHY_FORCE_TIMEOUT;
 562                 }
 563         }
 564
 565 out_unlock:
 566         mutex_unlock(&phydev->lock);
 567
 568         return err;
 569 }
 570 EXPORT_SYMBOL(phy_start_aneg);
 571
 572 static int phy_poll_aneg_done(struct phy_device *phydev)
 573 {
 574         unsigned int retries = 100;
 575         int ret;
 576
 577         do {
 578                 msleep(100);
 579                 ret = phy_aneg_done(phydev);
 580         } while (!ret && --retries);
 581
 582         if (!ret)
 583                 return -ETIMEDOUT;
 584
 585         return ret < 0 ? ret : 0;
 586 }
 587
 588 /**
 589  * phy_speed_down - set speed to lowest speed supported by both link partners
 590  * @phydev: the phy_device struct
 591  * @sync: perform action synchronously
 592  *
 593  * Description: Typically used to save energy when waiting for a WoL packet
 594  *
 595  * WARNING: Setting sync to false may cause the system being unable to suspend
 596  * in case the PHY generates an interrupt when finishing the autonegotiation.
 597  * This interrupt may wake up the system immediately after suspend.
 598  * Therefore use sync = false only if you're sure it's safe with the respective
 599  * network chip.
 600  */
 601 int phy_speed_down(struct phy_device *phydev, bool sync)
 602 {
 603         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 604         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
 605         int ret;
 606
 607         if (phydev->autoneg != AUTONEG_ENABLE)
 608                 return 0;
 609
 610         linkmode_copy(adv_old, phydev->advertising);
 611         linkmode_copy(adv, phydev->lp_advertising);
 612         linkmode_and(adv, adv, phydev->supported);
 613
 614         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, adv) ||
 615             linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, adv)) {
 616                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 617                                    phydev->advertising);
 618                 linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 619                                    phydev->advertising);
 620                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 621                                    phydev->advertising);
 622                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 623                                    phydev->advertising);
 624         } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 625                                      adv) ||
 626                    linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 627                                      adv)) {
 628                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 629                                    phydev->advertising);
 630                 linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 631                                    phydev->advertising);
 632         }
 633
 634         if (linkmode_equal(phydev->advertising, adv_old))
 635                 return 0;
 636
 637         ret = phy_config_aneg(phydev);
 638         if (ret)
 639                 return ret;
 640
 641         return sync ? phy_poll_aneg_done(phydev) : 0;
 642 }
 643 EXPORT_SYMBOL_GPL(phy_speed_down);
 644
 645 /**
 646  * phy_speed_up - (re)set advertised speeds to all supported speeds
 647  * @phydev: the phy_device struct
 648  *
 649  * Description: Used to revert the effect of phy_speed_down
 650  */
 651 int phy_speed_up(struct phy_device *phydev)
 652 {
 653         __ETHTOOL_DECLARE_LINK_MODE_MASK(all_speeds) = { 0, };
 654         __ETHTOOL_DECLARE_LINK_MODE_MASK(not_speeds);
 655         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 656         __ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
 657         __ETHTOOL_DECLARE_LINK_MODE_MASK(speeds);
 658
 659         linkmode_copy(adv_old, phydev->advertising);
 660
 661         if (phydev->autoneg != AUTONEG_ENABLE)
 662                 return 0;
 663
 664         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, all_speeds);
 665         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, all_speeds);
 666         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, all_speeds);
 667         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, all_speeds);
 668         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, all_speeds);
 669         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, all_speeds);
 670
 671         linkmode_andnot(not_speeds, adv_old, all_speeds);
 672         linkmode_copy(supported, phydev->supported);
 673         linkmode_and(speeds, supported, all_speeds);
 674         linkmode_or(phydev->advertising, not_speeds, speeds);
 675
 676         if (linkmode_equal(phydev->advertising, adv_old))
 677                 return 0;
 678
 679         return phy_config_aneg(phydev);
 680 }
 681 EXPORT_SYMBOL_GPL(phy_speed_up);
 682
 683 /**
 684  * phy_start_machine - start PHY state machine tracking
 685  * @phydev: the phy_device struct
 686  *
 687  * Description: The PHY infrastructure can run a state machine
 688  *   which tracks whether the PHY is starting up, negotiating,
 689  *   etc.  This function starts the delayed workqueue which tracks
 690  *   the state of the PHY. If you want to maintain your own state machine,
 691  *   do not call this function.
 692  */
 693 void phy_start_machine(struct phy_device *phydev)
 694 {
 695         phy_trigger_machine(phydev);
 696 }
 697 EXPORT_SYMBOL_GPL(phy_start_machine);
 698
 699 /**
 700  * phy_stop_machine - stop the PHY state machine tracking
 701  * @phydev: target phy_device struct
 702  *
 703  * Description: Stops the state machine delayed workqueue, sets the
 704  *   state to UP (unless it wasn't up yet). This function must be
 705  *   called BEFORE phy_detach.
 706  */
 707 void phy_stop_machine(struct phy_device *phydev)
 708 {
 709         cancel_delayed_work_sync(&phydev->state_queue);
 710
 711         mutex_lock(&phydev->lock);
 712         if (__phy_is_started(phydev))
 713                 phydev->state = PHY_UP;
 714         mutex_unlock(&phydev->lock);
 715 }
 716
 717 /**
 718  * phy_error - enter HALTED state for this PHY device
 719  * @phydev: target phy_device struct
 720  *
 721  * Moves the PHY to the HALTED state in response to a read
 722  * or write error, and tells the controller the link is down.
 723  * Must not be called from interrupt context, or while the
 724  * phydev->lock is held.
 725  */
 726 static void phy_error(struct phy_device *phydev)
 727 {
 728         WARN_ON(1);
 729
 730         mutex_lock(&phydev->lock);
 731         phydev->state = PHY_HALTED;
 732         mutex_unlock(&phydev->lock);
 733
 734         phy_trigger_machine(phydev);
 735 }
 736
 737 /**
 738  * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 739  * @phydev: target phy_device struct
 740  */
 741 static int phy_disable_interrupts(struct phy_device *phydev)
 742 {
 743         int err;
 744
 745         /* Disable PHY interrupts */
 746         err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 747         if (err)
 748                 return err;
 749
 750         /* Clear the interrupt */
 751         return phy_clear_interrupt(phydev);
 752 }
 753
 754 /**
 755  * phy_interrupt - PHY interrupt handler
 756  * @irq: interrupt line
 757  * @phy_dat: phy_device pointer
 758  *
 759  * Description: Handle PHY interrupt
 760  */
 761 static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 762 {
 763         struct phy_device *phydev = phy_dat;
 764
 765         if (!phy_is_started(phydev))
 766                 return IRQ_NONE;                /* It can't be ours.  */
 767
 768         if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
 769                 return IRQ_NONE;
 770
 771         /* reschedule state queue work to run as soon as possible */
 772         phy_trigger_machine(phydev);
 773
 774         if (phy_clear_interrupt(phydev))
 775                 goto phy_err;
 776         return IRQ_HANDLED;
 777
 778 phy_err:
 779         phy_error(phydev);
 780         return IRQ_NONE;
 781 }
 782
 783 /**
 784  * phy_enable_interrupts - Enable the interrupts from the PHY side
 785  * @phydev: target phy_device struct
 786  */
 787 static int phy_enable_interrupts(struct phy_device *phydev)
 788 {
 789         int err = phy_clear_interrupt(phydev);
 790
 791         if (err < 0)
 792                 return err;
 793
 794         return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 795 }
 796
 797 /**
 798  * phy_start_interrupts - request and enable interrupts for a PHY device
 799  * @phydev: target phy_device struct
 800  *
 801  * Description: Request the interrupt for the given PHY.
 802  *   If this fails, then we set irq to PHY_POLL.
 803  *   Otherwise, we enable the interrupts in the PHY.
 804  *   This should only be called with a valid IRQ number.
 805  *   Returns 0 on success or < 0 on error.
 806  */
 807 int phy_start_interrupts(struct phy_device *phydev)
 808 {
 809         if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 810                                  IRQF_ONESHOT | IRQF_SHARED,
 811                                  phydev_name(phydev), phydev) < 0) {
 812                 pr_warn("%s: Can't get IRQ %d (PHY)\n",
 813                         phydev->mdio.bus->name, phydev->irq);
 814                 phydev->irq = PHY_POLL;
 815                 return 0;
 816         }
 817
 818         return phy_enable_interrupts(phydev);
 819 }
 820 EXPORT_SYMBOL(phy_start_interrupts);
 821
 822 /**
 823  * phy_stop_interrupts - disable interrupts from a PHY device
 824  * @phydev: target phy_device struct
 825  */
 826 int phy_stop_interrupts(struct phy_device *phydev)
 827 {
 828         int err = phy_disable_interrupts(phydev);
 829
 830         if (err)
 831                 phy_error(phydev);
 832
 833         free_irq(phydev->irq, phydev);
 834
 835         return err;
 836 }
 837 EXPORT_SYMBOL(phy_stop_interrupts);
 838
 839 /**
 840  * phy_stop - Bring down the PHY link, and stop checking the status
 841  * @phydev: target phy_device struct
 842  */
 843 void phy_stop(struct phy_device *phydev)
 844 {
 845         mutex_lock(&phydev->lock);
 846
 847         if (!__phy_is_started(phydev)) {
 848                 WARN(1, "called from state %s\n",
 849                      phy_state_to_str(phydev->state));
 850                 mutex_unlock(&phydev->lock);
 851                 return;
 852         }
 853
 854         if (phy_interrupt_is_valid(phydev))
 855                 phy_disable_interrupts(phydev);
 856
 857         phydev->state = PHY_HALTED;
 858
 859         mutex_unlock(&phydev->lock);
 860
 861         phy_state_machine(&phydev->state_queue.work);
 862
 863         /* Cannot call flush_scheduled_work() here as desired because
 864          * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
 865          * will not reenable interrupts.
 866          */
 867 }
 868 EXPORT_SYMBOL(phy_stop);
 869
 870 /**
 871  * phy_start - start or restart a PHY device
 872  * @phydev: target phy_device struct
 873  *
 874  * Description: Indicates the attached device's readiness to
 875  *   handle PHY-related work.  Used during startup to start the
 876  *   PHY, and after a call to phy_stop() to resume operation.
 877  *   Also used to indicate the MDIO bus has cleared an error
 878  *   condition.
 879  */
 880 void phy_start(struct phy_device *phydev)
 881 {
 882         int err = 0;
 883
 884         mutex_lock(&phydev->lock);
 885
 886         switch (phydev->state) {
 887         case PHY_READY:
 888                 phydev->state = PHY_UP;
 889                 break;
 890         case PHY_HALTED:
 891                 /* if phy was suspended, bring the physical link up again */
 892                 __phy_resume(phydev);
 893
 894                 /* make sure interrupts are re-enabled for the PHY */
 895                 if (phy_interrupt_is_valid(phydev)) {
 896                         err = phy_enable_interrupts(phydev);
 897                         if (err < 0)
 898                                 break;
 899                 }
 900
 901                 phydev->state = PHY_RESUMING;
 902                 break;
 903         default:
 904                 break;
 905         }
 906         mutex_unlock(&phydev->lock);
 907
 908         phy_trigger_machine(phydev);
 909 }
 910 EXPORT_SYMBOL(phy_start);
 911
 912 /**
 913  * phy_state_machine - Handle the state machine
 914  * @work: work_struct that describes the work to be done
 915  */
 916 void phy_state_machine(struct work_struct *work)
 917 {
 918         struct delayed_work *dwork = to_delayed_work(work);
 919         struct phy_device *phydev =
 920                         container_of(dwork, struct phy_device, state_queue);
 921         bool needs_aneg = false, do_suspend = false;
 922         enum phy_state old_state;
 923         int err = 0;
 924
 925         mutex_lock(&phydev->lock);
 926
 927         old_state = phydev->state;
 928
 929         if (phydev->drv && phydev->drv->link_change_notify)
 930                 phydev->drv->link_change_notify(phydev);
 931
 932         switch (phydev->state) {
 933         case PHY_DOWN:
 934         case PHY_READY:
 935                 break;
 936         case PHY_UP:
 937                 needs_aneg = true;
 938
 939                 break;
 940         case PHY_NOLINK:
 941         case PHY_RUNNING:
 942         case PHY_CHANGELINK:
 943         case PHY_RESUMING:
 944                 err = phy_check_link_status(phydev);
 945                 break;
 946         case PHY_FORCING:
 947                 err = genphy_update_link(phydev);
 948                 if (err)
 949                         break;
 950
 951                 if (phydev->link) {
 952                         phydev->state = PHY_RUNNING;
 953                         phy_link_up(phydev);
 954                 } else {
 955                         if (0 == phydev->link_timeout--)
 956                                 needs_aneg = true;
 957                         phy_link_down(phydev, false);
 958                 }
 959                 break;
 960         case PHY_HALTED:
 961                 if (phydev->link) {
 962                         phydev->link = 0;
 963                         phy_link_down(phydev, true);
 964                         do_suspend = true;
 965                 }
 966                 break;
 967         }
 968
 969         mutex_unlock(&phydev->lock);
 970
 971         if (needs_aneg)
 972                 err = phy_start_aneg(phydev);
 973         else if (do_suspend)
 974                 phy_suspend(phydev);
 975
 976         if (err < 0)
 977                 phy_error(phydev);
 978
 979         if (old_state != phydev->state)
 980                 phydev_dbg(phydev, "PHY state change %s -> %s\n",
 981                            phy_state_to_str(old_state),
 982                            phy_state_to_str(phydev->state));
 983
 984         /* Only re-schedule a PHY state machine change if we are polling the
 985          * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving
 986          * between states from phy_mac_interrupt().
 987          *
 988          * In state PHY_HALTED the PHY gets suspended, so rescheduling the
 989          * state machine would be pointless and possibly error prone when
 990          * called from phy_disconnect() synchronously.
 991          */
 992         if (phy_polling_mode(phydev) && phy_is_started(phydev))
 993                 phy_queue_state_machine(phydev, PHY_STATE_TIME);
 994 }
 995
 996 /**
 997  * phy_mac_interrupt - MAC says the link has changed
 998  * @phydev: phy_device struct with changed link
 999  *
1000  * The MAC layer is able to indicate there has been a change in the PHY link
1001  * status. Trigger the state machine and work a work queue.
1002  */
1003 void phy_mac_interrupt(struct phy_device *phydev)
1004 {
1005         /* Trigger a state machine change */
1006         phy_trigger_machine(phydev);
1007 }
1008 EXPORT_SYMBOL(phy_mac_interrupt);
1009
1010 static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
1011 {
1012         linkmode_zero(advertising);
1013
1014         if (eee_adv & MDIO_EEE_100TX)
1015                 linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
1016                                  advertising);
1017         if (eee_adv & MDIO_EEE_1000T)
1018                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
1019                                  advertising);
1020         if (eee_adv & MDIO_EEE_10GT)
1021                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
1022                                  advertising);
1023         if (eee_adv & MDIO_EEE_1000KX)
1024                 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
1025                                  advertising);
1026         if (eee_adv & MDIO_EEE_10GKX4)
1027                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
1028                                  advertising);
1029         if (eee_adv & MDIO_EEE_10GKR)
1030                 linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
1031                                  advertising);
1032 }
1033
1034 /**
1035  * phy_init_eee - init and check the EEE feature
1036  * @phydev: target phy_device struct
1037  * @clk_stop_enable: PHY may stop the clock during LPI
1038  *
1039  * Description: it checks if the Energy-Efficient Ethernet (EEE)
1040  * is supported by looking at the MMD registers 3.20 and 7.60/61
1041  * and it programs the MMD register 3.0 setting the "Clock stop enable"
1042  * bit if required.
1043  */
1044 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
1045 {
1046         if (!phydev->drv)
1047                 return -EIO;
1048
1049         /* According to 802.3az,the EEE is supported only in full duplex-mode.
1050          */
1051         if (phydev->duplex == DUPLEX_FULL) {
1052                 __ETHTOOL_DECLARE_LINK_MODE_MASK(common);
1053                 __ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
1054                 __ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
1055                 int eee_lp, eee_cap, eee_adv;
1056                 int status;
1057                 u32 cap;
1058
1059                 /* Read phy status to properly get the right settings */
1060                 status = phy_read_status(phydev);
1061                 if (status)
1062                         return status;
1063
1064                 /* First check if the EEE ability is supported */
1065                 eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1066                 if (eee_cap <= 0)
1067                         goto eee_exit_err;
1068
1069                 cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
1070                 if (!cap)
1071                         goto eee_exit_err;
1072
1073                 /* Check which link settings negotiated and verify it in
1074                  * the EEE advertising registers.
1075                  */
1076                 eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1077                 if (eee_lp <= 0)
1078                         goto eee_exit_err;
1079
1080                 eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1081                 if (eee_adv <= 0)
1082                         goto eee_exit_err;
1083
1084                 mmd_eee_adv_to_linkmode(adv, eee_adv);
1085                 mmd_eee_adv_to_linkmode(lp, eee_lp);
1086                 linkmode_and(common, adv, lp);
1087
1088                 if (!phy_check_valid(phydev->speed, phydev->duplex, common))
1089                         goto eee_exit_err;
1090
1091                 if (clk_stop_enable) {
1092                         /* Configure the PHY to stop receiving xMII
1093                          * clock while it is signaling LPI.
1094                          */
1095                         int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1);
1096                         if (val < 0)
1097                                 return val;
1098
1099                         val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
1100                         phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val);
1101                 }
1102
1103                 return 0; /* EEE supported */
1104         }
1105 eee_exit_err:
1106         return -EPROTONOSUPPORT;
1107 }
1108 EXPORT_SYMBOL(phy_init_eee);
1109
1110 /**
1111  * phy_get_eee_err - report the EEE wake error count
1112  * @phydev: target phy_device struct
1113  *
1114  * Description: it is to report the number of time where the PHY
1115  * failed to complete its normal wake sequence.
1116  */
1117 int phy_get_eee_err(struct phy_device *phydev)
1118 {
1119         if (!phydev->drv)
1120                 return -EIO;
1121
1122         return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR);
1123 }
1124 EXPORT_SYMBOL(phy_get_eee_err);
1125
1126 /**
1127  * phy_ethtool_get_eee - get EEE supported and status
1128  * @phydev: target phy_device struct
1129  * @data: ethtool_eee data
1130  *
1131  * Description: it reportes the Supported/Advertisement/LP Advertisement
1132  * capabilities.
1133  */
1134 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
1135 {
1136         int val;
1137
1138         if (!phydev->drv)
1139                 return -EIO;
1140
1141         /* Get Supported EEE */
1142         val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1143         if (val < 0)
1144                 return val;
1145         data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
1146
1147         /* Get advertisement EEE */
1148         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1149         if (val < 0)
1150                 return val;
1151         data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1152         data->eee_enabled = !!data->advertised;
1153
1154         /* Get LP advertisement EEE */
1155         val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
1156         if (val < 0)
1157                 return val;
1158         data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
1159
1160         data->eee_active = !!(data->advertised & data->lp_advertised);
1161
1162         return 0;
1163 }
1164 EXPORT_SYMBOL(phy_ethtool_get_eee);
1165
1166 /**
1167  * phy_ethtool_set_eee - set EEE supported and status
1168  * @phydev: target phy_device struct
1169  * @data: ethtool_eee data
1170  *
1171  * Description: it is to program the Advertisement EEE register.
1172  */
1173 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
1174 {
1175         int cap, old_adv, adv = 0, ret;
1176
1177         if (!phydev->drv)
1178                 return -EIO;
1179
1180         /* Get Supported EEE */
1181         cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
1182         if (cap < 0)
1183                 return cap;
1184
1185         old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
1186         if (old_adv < 0)
1187                 return old_adv;
1188
1189         if (data->eee_enabled) {
1190                 adv = !data->advertised ? cap :
1191                       ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
1192                 /* Mask prohibited EEE modes */
1193                 adv &= ~phydev->eee_broken_modes;
1194         }
1195
1196         if (old_adv != adv) {
1197                 ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
1198                 if (ret < 0)
1199                         return ret;
1200
1201                 /* Restart autonegotiation so the new modes get sent to the
1202                  * link partner.
1203                  */
1204                 ret = phy_restart_aneg(phydev);
1205                 if (ret < 0)
1206                         return ret;
1207         }
1208
1209         return 0;
1210 }
1211 EXPORT_SYMBOL(phy_ethtool_set_eee);
1212
1213 int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1214 {
1215         if (phydev->drv && phydev->drv->set_wol)
1216                 return phydev->drv->set_wol(phydev, wol);
1217
1218         return -EOPNOTSUPP;
1219 }
1220 EXPORT_SYMBOL(phy_ethtool_set_wol);
1221
1222 void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
1223 {
1224         if (phydev->drv && phydev->drv->get_wol)
1225                 phydev->drv->get_wol(phydev, wol);
1226 }
1227 EXPORT_SYMBOL(phy_ethtool_get_wol);
1228
1229 int phy_ethtool_get_link_ksettings(struct net_device *ndev,
1230                                    struct ethtool_link_ksettings *cmd)
1231 {
1232         struct phy_device *phydev = ndev->phydev;
1233
1234         if (!phydev)
1235                 return -ENODEV;
1236
1237         phy_ethtool_ksettings_get(phydev, cmd);
1238
1239         return 0;
1240 }
1241 EXPORT_SYMBOL(phy_ethtool_get_link_ksettings);
1242
1243 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
1244                                    const struct ethtool_link_ksettings *cmd)
1245 {
1246         struct phy_device *phydev = ndev->phydev;
1247
1248         if (!phydev)
1249                 return -ENODEV;
1250
1251         return phy_ethtool_ksettings_set(phydev, cmd);
1252 }
1253 EXPORT_SYMBOL(phy_ethtool_set_link_ksettings);
1254
1255 int phy_ethtool_nway_reset(struct net_device *ndev)
1256 {
1257         struct phy_device *phydev = ndev->phydev;
1258
1259         if (!phydev)
1260                 return -ENODEV;
1261
1262         if (!phydev->drv)
1263                 return -EIO;
1264
1265         return phy_restart_aneg(phydev);
1266 }
1267 EXPORT_SYMBOL(phy_ethtool_nway_reset);