drivers/net/phy/phylink.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * phylink models the MAC to optional PHY connection, supporting
   4  * technologies such as SFP cages where the PHY is hot-pluggable.
   5  *
   6  * Copyright (C) 2015 Russell King
   7  */
   8 #include <linux/ethtool.h>
   9 #include <linux/export.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/of.h>
  13 #include <linux/of_mdio.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/phylink.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/timer.h>
  20 #include <linux/workqueue.h>
  21
  22 #include "sfp.h"
  23 #include "swphy.h"
  24
  25 #define SUPPORTED_INTERFACES \
  26         (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
  27          SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
  28 #define ADVERTISED_INTERFACES \
  29         (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
  30          ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
  31
  32 enum {
  33         PHYLINK_DISABLE_STOPPED,
  34         PHYLINK_DISABLE_LINK,
  35 };
  36
  37 /**
  38  * struct phylink - internal data type for phylink
  39  */
  40 struct phylink {
  41         /* private: */
  42         struct net_device *netdev;
  43         const struct phylink_mac_ops *mac_ops;
  44         const struct phylink_pcs_ops *pcs_ops;
  45         struct phylink_config *config;
  46         struct phylink_pcs *pcs;
  47         struct device *dev;
  48         unsigned int old_link_state:1;
  49
  50         unsigned long phylink_disable_state; /* bitmask of disables */
  51         struct phy_device *phydev;
  52         phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
  53         u8 cfg_link_an_mode;            /* MLO_AN_xxx */
  54         u8 cur_link_an_mode;
  55         u8 link_port;                   /* The current non-phy ethtool port */
  56         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
  57
  58         /* The link configuration settings */
  59         struct phylink_link_state link_config;
  60
  61         /* The current settings */
  62         phy_interface_t cur_interface;
  63
  64         struct gpio_desc *link_gpio;
  65         unsigned int link_irq;
  66         struct timer_list link_poll;
  67         void (*get_fixed_state)(struct net_device *dev,
  68                                 struct phylink_link_state *s);
  69
  70         struct mutex state_mutex;
  71         struct phylink_link_state phy_state;
  72         struct work_struct resolve;
  73
  74         bool mac_link_dropped;
  75
  76         struct sfp_bus *sfp_bus;
  77         bool sfp_may_have_phy;
  78         __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
  79         u8 sfp_port;
  80 };
  81
  82 #define phylink_printk(level, pl, fmt, ...) \
  83         do { \
  84                 if ((pl)->config->type == PHYLINK_NETDEV) \
  85                         netdev_printk(level, (pl)->netdev, fmt, ##__VA_ARGS__); \
  86                 else if ((pl)->config->type == PHYLINK_DEV) \
  87                         dev_printk(level, (pl)->dev, fmt, ##__VA_ARGS__); \
  88         } while (0)
  89
  90 #define phylink_err(pl, fmt, ...) \
  91         phylink_printk(KERN_ERR, pl, fmt, ##__VA_ARGS__)
  92 #define phylink_warn(pl, fmt, ...) \
  93         phylink_printk(KERN_WARNING, pl, fmt, ##__VA_ARGS__)
  94 #define phylink_info(pl, fmt, ...) \
  95         phylink_printk(KERN_INFO, pl, fmt, ##__VA_ARGS__)
  96 #if defined(CONFIG_DYNAMIC_DEBUG)
  97 #define phylink_dbg(pl, fmt, ...) \
  98 do {                                                                    \
  99         if ((pl)->config->type == PHYLINK_NETDEV)                       \
 100                 netdev_dbg((pl)->netdev, fmt, ##__VA_ARGS__);           \
 101         else if ((pl)->config->type == PHYLINK_DEV)                     \
 102                 dev_dbg((pl)->dev, fmt, ##__VA_ARGS__);                 \
 103 } while (0)
 104 #elif defined(DEBUG)
 105 #define phylink_dbg(pl, fmt, ...)                                       \
 106         phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__)
 107 #else
 108 #define phylink_dbg(pl, fmt, ...)                                       \
 109 ({                                                                      \
 110         if (0)                                                          \
 111                 phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__);     \
 112 })
 113 #endif
 114
 115 /**
 116  * phylink_set_port_modes() - set the port type modes in the ethtool mask
 117  * @mask: ethtool link mode mask
 118  *
 119  * Sets all the port type modes in the ethtool mask.  MAC drivers should
 120  * use this in their 'validate' callback.
 121  */
 122 void phylink_set_port_modes(unsigned long *mask)
 123 {
 124         phylink_set(mask, TP);
 125         phylink_set(mask, AUI);
 126         phylink_set(mask, MII);
 127         phylink_set(mask, FIBRE);
 128         phylink_set(mask, BNC);
 129         phylink_set(mask, Backplane);
 130 }
 131 EXPORT_SYMBOL_GPL(phylink_set_port_modes);
 132
 133 static int phylink_is_empty_linkmode(const unsigned long *linkmode)
 134 {
 135         __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };
 136
 137         phylink_set_port_modes(tmp);
 138         phylink_set(tmp, Autoneg);
 139         phylink_set(tmp, Pause);
 140         phylink_set(tmp, Asym_Pause);
 141
 142         return linkmode_subset(linkmode, tmp);
 143 }
 144
 145 static const char *phylink_an_mode_str(unsigned int mode)
 146 {
 147         static const char *modestr[] = {
 148                 [MLO_AN_PHY] = "phy",
 149                 [MLO_AN_FIXED] = "fixed",
 150                 [MLO_AN_INBAND] = "inband",
 151         };
 152
 153         return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 154 }
 155
 156 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 157                             struct phylink_link_state *state)
 158 {
 159         pl->mac_ops->validate(pl->config, supported, state);
 160
 161         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 162 }
 163
 164 static int phylink_parse_fixedlink(struct phylink *pl,
 165                                    struct fwnode_handle *fwnode)
 166 {
 167         struct fwnode_handle *fixed_node;
 168         const struct phy_setting *s;
 169         struct gpio_desc *desc;
 170         u32 speed;
 171         int ret;
 172
 173         fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
 174         if (fixed_node) {
 175                 ret = fwnode_property_read_u32(fixed_node, "speed", &speed);
 176
 177                 pl->link_config.speed = speed;
 178                 pl->link_config.duplex = DUPLEX_HALF;
 179
 180                 if (fwnode_property_read_bool(fixed_node, "full-duplex"))
 181                         pl->link_config.duplex = DUPLEX_FULL;
 182
 183                 /* We treat the "pause" and "asym-pause" terminology as
 184                  * defining the link partner's ability. */
 185                 if (fwnode_property_read_bool(fixed_node, "pause"))
 186                         __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 187                                   pl->link_config.lp_advertising);
 188                 if (fwnode_property_read_bool(fixed_node, "asym-pause"))
 189                         __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 190                                   pl->link_config.lp_advertising);
 191
 192                 if (ret == 0) {
 193                         desc = fwnode_gpiod_get_index(fixed_node, "link", 0,
 194                                                       GPIOD_IN, "?");
 195
 196                         if (!IS_ERR(desc))
 197                                 pl->link_gpio = desc;
 198                         else if (desc == ERR_PTR(-EPROBE_DEFER))
 199                                 ret = -EPROBE_DEFER;
 200                 }
 201                 fwnode_handle_put(fixed_node);
 202
 203                 if (ret)
 204                         return ret;
 205         } else {
 206                 u32 prop[5];
 207
 208                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 209                                                      NULL, 0);
 210                 if (ret != ARRAY_SIZE(prop)) {
 211                         phylink_err(pl, "broken fixed-link?\n");
 212                         return -EINVAL;
 213                 }
 214
 215                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 216                                                      prop, ARRAY_SIZE(prop));
 217                 if (!ret) {
 218                         pl->link_config.duplex = prop[1] ?
 219                                                 DUPLEX_FULL : DUPLEX_HALF;
 220                         pl->link_config.speed = prop[2];
 221                         if (prop[3])
 222                                 __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 223                                           pl->link_config.lp_advertising);
 224                         if (prop[4])
 225                                 __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 226                                           pl->link_config.lp_advertising);
 227                 }
 228         }
 229
 230         if (pl->link_config.speed > SPEED_1000 &&
 231             pl->link_config.duplex != DUPLEX_FULL)
 232                 phylink_warn(pl, "fixed link specifies half duplex for %dMbps link?\n",
 233                              pl->link_config.speed);
 234
 235         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 236         linkmode_copy(pl->link_config.advertising, pl->supported);
 237         phylink_validate(pl, pl->supported, &pl->link_config);
 238
 239         s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 240                                pl->supported, true);
 241         linkmode_zero(pl->supported);
 242         phylink_set(pl->supported, MII);
 243         phylink_set(pl->supported, Pause);
 244         phylink_set(pl->supported, Asym_Pause);
 245         phylink_set(pl->supported, Autoneg);
 246         if (s) {
 247                 __set_bit(s->bit, pl->supported);
 248                 __set_bit(s->bit, pl->link_config.lp_advertising);
 249         } else {
 250                 phylink_warn(pl, "fixed link %s duplex %dMbps not recognised\n",
 251                              pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
 252                              pl->link_config.speed);
 253         }
 254
 255         linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
 256                      pl->supported);
 257
 258         pl->link_config.link = 1;
 259         pl->link_config.an_complete = 1;
 260
 261         return 0;
 262 }
 263
 264 static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
 265 {
 266         struct fwnode_handle *dn;
 267         const char *managed;
 268
 269         dn = fwnode_get_named_child_node(fwnode, "fixed-link");
 270         if (dn || fwnode_property_present(fwnode, "fixed-link"))
 271                 pl->cfg_link_an_mode = MLO_AN_FIXED;
 272         fwnode_handle_put(dn);
 273
 274         if (fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
 275             strcmp(managed, "in-band-status") == 0) {
 276                 if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 277                         phylink_err(pl,
 278                                     "can't use both fixed-link and in-band-status\n");
 279                         return -EINVAL;
 280                 }
 281
 282                 linkmode_zero(pl->supported);
 283                 phylink_set(pl->supported, MII);
 284                 phylink_set(pl->supported, Autoneg);
 285                 phylink_set(pl->supported, Asym_Pause);
 286                 phylink_set(pl->supported, Pause);
 287                 pl->link_config.an_enabled = true;
 288                 pl->cfg_link_an_mode = MLO_AN_INBAND;
 289
 290                 switch (pl->link_config.interface) {
 291                 case PHY_INTERFACE_MODE_SGMII:
 292                 case PHY_INTERFACE_MODE_QSGMII:
 293                         phylink_set(pl->supported, 10baseT_Half);
 294                         phylink_set(pl->supported, 10baseT_Full);
 295                         phylink_set(pl->supported, 100baseT_Half);
 296                         phylink_set(pl->supported, 100baseT_Full);
 297                         phylink_set(pl->supported, 1000baseT_Half);
 298                         phylink_set(pl->supported, 1000baseT_Full);
 299                         break;
 300
 301                 case PHY_INTERFACE_MODE_1000BASEX:
 302                         phylink_set(pl->supported, 1000baseX_Full);
 303                         break;
 304
 305                 case PHY_INTERFACE_MODE_2500BASEX:
 306                         phylink_set(pl->supported, 2500baseX_Full);
 307                         break;
 308
 309                 case PHY_INTERFACE_MODE_USXGMII:
 310                 case PHY_INTERFACE_MODE_10GKR:
 311                 case PHY_INTERFACE_MODE_10GBASER:
 312                         phylink_set(pl->supported, 10baseT_Half);
 313                         phylink_set(pl->supported, 10baseT_Full);
 314                         phylink_set(pl->supported, 100baseT_Half);
 315                         phylink_set(pl->supported, 100baseT_Full);
 316                         phylink_set(pl->supported, 1000baseT_Half);
 317                         phylink_set(pl->supported, 1000baseT_Full);
 318                         phylink_set(pl->supported, 1000baseX_Full);
 319                         phylink_set(pl->supported, 1000baseKX_Full);
 320                         phylink_set(pl->supported, 2500baseT_Full);
 321                         phylink_set(pl->supported, 2500baseX_Full);
 322                         phylink_set(pl->supported, 5000baseT_Full);
 323                         phylink_set(pl->supported, 10000baseT_Full);
 324                         phylink_set(pl->supported, 10000baseKR_Full);
 325                         phylink_set(pl->supported, 10000baseKX4_Full);
 326                         phylink_set(pl->supported, 10000baseCR_Full);
 327                         phylink_set(pl->supported, 10000baseSR_Full);
 328                         phylink_set(pl->supported, 10000baseLR_Full);
 329                         phylink_set(pl->supported, 10000baseLRM_Full);
 330                         phylink_set(pl->supported, 10000baseER_Full);
 331                         break;
 332
 333                 case PHY_INTERFACE_MODE_XLGMII:
 334                         phylink_set(pl->supported, 25000baseCR_Full);
 335                         phylink_set(pl->supported, 25000baseKR_Full);
 336                         phylink_set(pl->supported, 25000baseSR_Full);
 337                         phylink_set(pl->supported, 40000baseKR4_Full);
 338                         phylink_set(pl->supported, 40000baseCR4_Full);
 339                         phylink_set(pl->supported, 40000baseSR4_Full);
 340                         phylink_set(pl->supported, 40000baseLR4_Full);
 341                         phylink_set(pl->supported, 50000baseCR2_Full);
 342                         phylink_set(pl->supported, 50000baseKR2_Full);
 343                         phylink_set(pl->supported, 50000baseSR2_Full);
 344                         phylink_set(pl->supported, 50000baseKR_Full);
 345                         phylink_set(pl->supported, 50000baseSR_Full);
 346                         phylink_set(pl->supported, 50000baseCR_Full);
 347                         phylink_set(pl->supported, 50000baseLR_ER_FR_Full);
 348                         phylink_set(pl->supported, 50000baseDR_Full);
 349                         phylink_set(pl->supported, 100000baseKR4_Full);
 350                         phylink_set(pl->supported, 100000baseSR4_Full);
 351                         phylink_set(pl->supported, 100000baseCR4_Full);
 352                         phylink_set(pl->supported, 100000baseLR4_ER4_Full);
 353                         phylink_set(pl->supported, 100000baseKR2_Full);
 354                         phylink_set(pl->supported, 100000baseSR2_Full);
 355                         phylink_set(pl->supported, 100000baseCR2_Full);
 356                         phylink_set(pl->supported, 100000baseLR2_ER2_FR2_Full);
 357                         phylink_set(pl->supported, 100000baseDR2_Full);
 358                         break;
 359
 360                 default:
 361                         phylink_err(pl,
 362                                     "incorrect link mode %s for in-band status\n",
 363                                     phy_modes(pl->link_config.interface));
 364                         return -EINVAL;
 365                 }
 366
 367                 linkmode_copy(pl->link_config.advertising, pl->supported);
 368
 369                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 370                         phylink_err(pl,
 371                                     "failed to validate link configuration for in-band status\n");
 372                         return -EINVAL;
 373                 }
 374
 375                 /* Check if MAC/PCS also supports Autoneg. */
 376                 pl->link_config.an_enabled = phylink_test(pl->supported, Autoneg);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static void phylink_apply_manual_flow(struct phylink *pl,
 383                                       struct phylink_link_state *state)
 384 {
 385         /* If autoneg is disabled, pause AN is also disabled */
 386         if (!state->an_enabled)
 387                 state->pause &= ~MLO_PAUSE_AN;
 388
 389         /* Manual configuration of pause modes */
 390         if (!(pl->link_config.pause & MLO_PAUSE_AN))
 391                 state->pause = pl->link_config.pause;
 392 }
 393
 394 static void phylink_resolve_flow(struct phylink_link_state *state)
 395 {
 396         bool tx_pause, rx_pause;
 397
 398         state->pause = MLO_PAUSE_NONE;
 399         if (state->duplex == DUPLEX_FULL) {
 400                 linkmode_resolve_pause(state->advertising,
 401                                        state->lp_advertising,
 402                                        &tx_pause, &rx_pause);
 403                 if (tx_pause)
 404                         state->pause |= MLO_PAUSE_TX;
 405                 if (rx_pause)
 406                         state->pause |= MLO_PAUSE_RX;
 407         }
 408 }
 409
 410 static void phylink_mac_config(struct phylink *pl,
 411                                const struct phylink_link_state *state)
 412 {
 413         phylink_dbg(pl,
 414                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 415                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 416                     phy_modes(state->interface),
 417                     phy_speed_to_str(state->speed),
 418                     phy_duplex_to_str(state->duplex),
 419                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 420                     state->pause, state->link, state->an_enabled);
 421
 422         pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 423 }
 424
 425 static void phylink_mac_pcs_an_restart(struct phylink *pl)
 426 {
 427         if (pl->link_config.an_enabled &&
 428             phy_interface_mode_is_8023z(pl->link_config.interface) &&
 429             phylink_autoneg_inband(pl->cur_link_an_mode)) {
 430                 if (pl->pcs_ops)
 431                         pl->pcs_ops->pcs_an_restart(pl->pcs);
 432                 else
 433                         pl->mac_ops->mac_an_restart(pl->config);
 434         }
 435 }
 436
 437 static void phylink_major_config(struct phylink *pl, bool restart,
 438                                   const struct phylink_link_state *state)
 439 {
 440         int err;
 441
 442         phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
 443
 444         if (pl->mac_ops->mac_prepare) {
 445                 err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
 446                                                state->interface);
 447                 if (err < 0) {
 448                         phylink_err(pl, "mac_prepare failed: %pe\n",
 449                                     ERR_PTR(err));
 450                         return;
 451                 }
 452         }
 453
 454         phylink_mac_config(pl, state);
 455
 456         if (pl->pcs_ops) {
 457                 err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 458                                               state->interface,
 459                                               state->advertising,
 460                                               !!(pl->link_config.pause &
 461                                                  MLO_PAUSE_AN));
 462                 if (err < 0)
 463                         phylink_err(pl, "pcs_config failed: %pe\n",
 464                                     ERR_PTR(err));
 465                 if (err > 0)
 466                         restart = true;
 467         }
 468         if (restart)
 469                 phylink_mac_pcs_an_restart(pl);
 470
 471         if (pl->mac_ops->mac_finish) {
 472                 err = pl->mac_ops->mac_finish(pl->config, pl->cur_link_an_mode,
 473                                               state->interface);
 474                 if (err < 0)
 475                         phylink_err(pl, "mac_prepare failed: %pe\n",
 476                                     ERR_PTR(err));
 477         }
 478 }
 479
 480 /*
 481  * Reconfigure for a change of inband advertisement.
 482  * If we have a separate PCS, we only need to call its pcs_config() method,
 483  * and then restart AN if it indicates something changed. Otherwise, we do
 484  * the full MAC reconfiguration.
 485  */
 486 static int phylink_change_inband_advert(struct phylink *pl)
 487 {
 488         int ret;
 489
 490         if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
 491                 return 0;
 492
 493         if (!pl->pcs_ops) {
 494                 /* Legacy method */
 495                 phylink_mac_config(pl, &pl->link_config);
 496                 phylink_mac_pcs_an_restart(pl);
 497                 return 0;
 498         }
 499
 500         phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
 501                     phylink_an_mode_str(pl->cur_link_an_mode),
 502                     phy_modes(pl->link_config.interface),
 503                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->link_config.advertising,
 504                     pl->link_config.pause);
 505
 506         /* Modern PCS-based method; update the advert at the PCS, and
 507          * restart negotiation if the pcs_config() helper indicates that
 508          * the programmed advertisement has changed.
 509          */
 510         ret = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 511                                       pl->link_config.interface,
 512                                       pl->link_config.advertising,
 513                                       !!(pl->link_config.pause & MLO_PAUSE_AN));
 514         if (ret < 0)
 515                 return ret;
 516
 517         if (ret > 0)
 518                 phylink_mac_pcs_an_restart(pl);
 519
 520         return 0;
 521 }
 522
 523 static void phylink_mac_pcs_get_state(struct phylink *pl,
 524                                       struct phylink_link_state *state)
 525 {
 526         linkmode_copy(state->advertising, pl->link_config.advertising);
 527         linkmode_zero(state->lp_advertising);
 528         state->interface = pl->link_config.interface;
 529         state->an_enabled = pl->link_config.an_enabled;
 530         state->speed = SPEED_UNKNOWN;
 531         state->duplex = DUPLEX_UNKNOWN;
 532         state->pause = MLO_PAUSE_NONE;
 533         state->an_complete = 0;
 534         state->link = 1;
 535
 536         if (pl->pcs_ops)
 537                 pl->pcs_ops->pcs_get_state(pl->pcs, state);
 538         else if (pl->mac_ops->mac_pcs_get_state)
 539                 pl->mac_ops->mac_pcs_get_state(pl->config, state);
 540         else
 541                 state->link = 0;
 542 }
 543
 544 /* The fixed state is... fixed except for the link state,
 545  * which may be determined by a GPIO or a callback.
 546  */
 547 static void phylink_get_fixed_state(struct phylink *pl,
 548                                     struct phylink_link_state *state)
 549 {
 550         *state = pl->link_config;
 551         if (pl->config->get_fixed_state)
 552                 pl->config->get_fixed_state(pl->config, state);
 553         else if (pl->link_gpio)
 554                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 555
 556         phylink_resolve_flow(state);
 557 }
 558
 559 static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
 560 {
 561         struct phylink_link_state link_state;
 562
 563         switch (pl->cur_link_an_mode) {
 564         case MLO_AN_PHY:
 565                 link_state = pl->phy_state;
 566                 break;
 567
 568         case MLO_AN_FIXED:
 569                 phylink_get_fixed_state(pl, &link_state);
 570                 break;
 571
 572         case MLO_AN_INBAND:
 573                 link_state = pl->link_config;
 574                 if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
 575                         link_state.pause = MLO_PAUSE_NONE;
 576                 break;
 577
 578         default: /* can't happen */
 579                 return;
 580         }
 581
 582         link_state.link = false;
 583
 584         phylink_apply_manual_flow(pl, &link_state);
 585         phylink_major_config(pl, force_restart, &link_state);
 586 }
 587
 588 static const char *phylink_pause_to_str(int pause)
 589 {
 590         switch (pause & MLO_PAUSE_TXRX_MASK) {
 591         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 592                 return "rx/tx";
 593         case MLO_PAUSE_TX:
 594                 return "tx";
 595         case MLO_PAUSE_RX:
 596                 return "rx";
 597         default:
 598                 return "off";
 599         }
 600 }
 601
 602 static void phylink_link_up(struct phylink *pl,
 603                             struct phylink_link_state link_state)
 604 {
 605         struct net_device *ndev = pl->netdev;
 606
 607         pl->cur_interface = link_state.interface;
 608
 609         if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
 610                 pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
 611                                          pl->cur_interface,
 612                                          link_state.speed, link_state.duplex);
 613
 614         pl->mac_ops->mac_link_up(pl->config, pl->phydev,
 615                                  pl->cur_link_an_mode, pl->cur_interface,
 616                                  link_state.speed, link_state.duplex,
 617                                  !!(link_state.pause & MLO_PAUSE_TX),
 618                                  !!(link_state.pause & MLO_PAUSE_RX));
 619
 620         if (ndev)
 621                 netif_carrier_on(ndev);
 622
 623         phylink_info(pl,
 624                      "Link is Up - %s/%s - flow control %s\n",
 625                      phy_speed_to_str(link_state.speed),
 626                      phy_duplex_to_str(link_state.duplex),
 627                      phylink_pause_to_str(link_state.pause));
 628 }
 629
 630 static void phylink_link_down(struct phylink *pl)
 631 {
 632         struct net_device *ndev = pl->netdev;
 633
 634         if (ndev)
 635                 netif_carrier_off(ndev);
 636         pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 637                                    pl->cur_interface);
 638         phylink_info(pl, "Link is Down\n");
 639 }
 640
 641 static void phylink_resolve(struct work_struct *w)
 642 {
 643         struct phylink *pl = container_of(w, struct phylink, resolve);
 644         struct phylink_link_state link_state;
 645         struct net_device *ndev = pl->netdev;
 646         bool mac_config = false;
 647         bool cur_link_state;
 648
 649         mutex_lock(&pl->state_mutex);
 650         if (pl->netdev)
 651                 cur_link_state = netif_carrier_ok(ndev);
 652         else
 653                 cur_link_state = pl->old_link_state;
 654
 655         if (pl->phylink_disable_state) {
 656                 pl->mac_link_dropped = false;
 657                 link_state.link = false;
 658         } else if (pl->mac_link_dropped) {
 659                 link_state.link = false;
 660         } else {
 661                 switch (pl->cur_link_an_mode) {
 662                 case MLO_AN_PHY:
 663                         link_state = pl->phy_state;
 664                         phylink_apply_manual_flow(pl, &link_state);
 665                         mac_config = link_state.link;
 666                         break;
 667
 668                 case MLO_AN_FIXED:
 669                         phylink_get_fixed_state(pl, &link_state);
 670                         mac_config = link_state.link;
 671                         break;
 672
 673                 case MLO_AN_INBAND:
 674                         phylink_mac_pcs_get_state(pl, &link_state);
 675
 676                         /* If we have a phy, the "up" state is the union of
 677                          * both the PHY and the MAC */
 678                         if (pl->phydev)
 679                                 link_state.link &= pl->phy_state.link;
 680
 681                         /* Only update if the PHY link is up */
 682                         if (pl->phydev && pl->phy_state.link) {
 683                                 link_state.interface = pl->phy_state.interface;
 684
 685                                 /* If we have a PHY, we need to update with
 686                                  * the PHY flow control bits. */
 687                                 link_state.pause = pl->phy_state.pause;
 688                                 mac_config = true;
 689                         }
 690                         phylink_apply_manual_flow(pl, &link_state);
 691                         break;
 692                 }
 693         }
 694
 695         if (mac_config) {
 696                 if (link_state.interface != pl->link_config.interface) {
 697                         /* The interface has changed, force the link down and
 698                          * then reconfigure.
 699                          */
 700                         if (cur_link_state) {
 701                                 phylink_link_down(pl);
 702                                 cur_link_state = false;
 703                         }
 704                         phylink_major_config(pl, false, &link_state);
 705                         pl->link_config.interface = link_state.interface;
 706                 } else if (!pl->pcs_ops) {
 707                         /* The interface remains unchanged, only the speed,
 708                          * duplex or pause settings have changed. Call the
 709                          * old mac_config() method to configure the MAC/PCS
 710                          * only if we do not have a PCS installed (an
 711                          * unconverted user.)
 712                          */
 713                         phylink_mac_config(pl, &link_state);
 714                 }
 715         }
 716
 717         if (link_state.link != cur_link_state) {
 718                 pl->old_link_state = link_state.link;
 719                 if (!link_state.link)
 720                         phylink_link_down(pl);
 721                 else
 722                         phylink_link_up(pl, link_state);
 723         }
 724         if (!link_state.link && pl->mac_link_dropped) {
 725                 pl->mac_link_dropped = false;
 726                 queue_work(system_power_efficient_wq, &pl->resolve);
 727         }
 728         mutex_unlock(&pl->state_mutex);
 729 }
 730
 731 static void phylink_run_resolve(struct phylink *pl)
 732 {
 733         if (!pl->phylink_disable_state)
 734                 queue_work(system_power_efficient_wq, &pl->resolve);
 735 }
 736
 737 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 738 {
 739         unsigned long state = pl->phylink_disable_state;
 740
 741         set_bit(bit, &pl->phylink_disable_state);
 742         if (state == 0) {
 743                 queue_work(system_power_efficient_wq, &pl->resolve);
 744                 flush_work(&pl->resolve);
 745         }
 746 }
 747
 748 static void phylink_fixed_poll(struct timer_list *t)
 749 {
 750         struct phylink *pl = container_of(t, struct phylink, link_poll);
 751
 752         mod_timer(t, jiffies + HZ);
 753
 754         phylink_run_resolve(pl);
 755 }
 756
 757 static const struct sfp_upstream_ops sfp_phylink_ops;
 758
 759 static int phylink_register_sfp(struct phylink *pl,
 760                                 struct fwnode_handle *fwnode)
 761 {
 762         struct sfp_bus *bus;
 763         int ret;
 764
 765         if (!fwnode)
 766                 return 0;
 767
 768         bus = sfp_bus_find_fwnode(fwnode);
 769         if (IS_ERR(bus)) {
 770                 ret = PTR_ERR(bus);
 771                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 772                 return ret;
 773         }
 774
 775         pl->sfp_bus = bus;
 776
 777         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 778         sfp_bus_put(bus);
 779
 780         return ret;
 781 }
 782
 783 /**
 784  * phylink_create() - create a phylink instance
 785  * @config: a pointer to the target &struct phylink_config
 786  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 787  *      interface
 788  * @iface: the desired link mode defined by &typedef phy_interface_t
 789  * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
 790  *
 791  * Create a new phylink instance, and parse the link parameters found in @np.
 792  * This will parse in-band modes, fixed-link or SFP configuration.
 793  *
 794  * Note: the rtnl lock must not be held when calling this function.
 795  *
 796  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 797  * must use IS_ERR() to check for errors from this function.
 798  */
 799 struct phylink *phylink_create(struct phylink_config *config,
 800                                struct fwnode_handle *fwnode,
 801                                phy_interface_t iface,
 802                                const struct phylink_mac_ops *mac_ops)
 803 {
 804         struct phylink *pl;
 805         int ret;
 806
 807         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 808         if (!pl)
 809                 return ERR_PTR(-ENOMEM);
 810
 811         mutex_init(&pl->state_mutex);
 812         INIT_WORK(&pl->resolve, phylink_resolve);
 813
 814         pl->config = config;
 815         if (config->type == PHYLINK_NETDEV) {
 816                 pl->netdev = to_net_dev(config->dev);
 817         } else if (config->type == PHYLINK_DEV) {
 818                 pl->dev = config->dev;
 819         } else {
 820                 kfree(pl);
 821                 return ERR_PTR(-EINVAL);
 822         }
 823
 824         pl->phy_state.interface = iface;
 825         pl->link_interface = iface;
 826         if (iface == PHY_INTERFACE_MODE_MOCA)
 827                 pl->link_port = PORT_BNC;
 828         else
 829                 pl->link_port = PORT_MII;
 830         pl->link_config.interface = iface;
 831         pl->link_config.pause = MLO_PAUSE_AN;
 832         pl->link_config.speed = SPEED_UNKNOWN;
 833         pl->link_config.duplex = DUPLEX_UNKNOWN;
 834         pl->link_config.an_enabled = true;
 835         pl->mac_ops = mac_ops;
 836         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 837         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 838
 839         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 840         linkmode_copy(pl->link_config.advertising, pl->supported);
 841         phylink_validate(pl, pl->supported, &pl->link_config);
 842
 843         ret = phylink_parse_mode(pl, fwnode);
 844         if (ret < 0) {
 845                 kfree(pl);
 846                 return ERR_PTR(ret);
 847         }
 848
 849         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 850                 ret = phylink_parse_fixedlink(pl, fwnode);
 851                 if (ret < 0) {
 852                         kfree(pl);
 853                         return ERR_PTR(ret);
 854                 }
 855         }
 856
 857         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 858
 859         ret = phylink_register_sfp(pl, fwnode);
 860         if (ret < 0) {
 861                 kfree(pl);
 862                 return ERR_PTR(ret);
 863         }
 864
 865         return pl;
 866 }
 867 EXPORT_SYMBOL_GPL(phylink_create);
 868
 869 /**
 870  * phylink_set_pcs() - set the current PCS for phylink to use
 871  * @pl: a pointer to a &struct phylink returned from phylink_create()
 872  * @pcs: a pointer to the &struct phylink_pcs
 873  *
 874  * Bind the MAC PCS to phylink.  This may be called after phylink_create(),
 875  * in mac_prepare() or mac_config() methods if it is desired to dynamically
 876  * change the PCS.
 877  *
 878  * Please note that there are behavioural changes with the mac_config()
 879  * callback if a PCS is present (denoting a newer setup) so removing a PCS
 880  * is not supported, and if a PCS is going to be used, it must be registered
 881  * by calling phylink_set_pcs() at the latest in the first mac_config() call.
 882  */
 883 void phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs)
 884 {
 885         pl->pcs = pcs;
 886         pl->pcs_ops = pcs->ops;
 887 }
 888 EXPORT_SYMBOL_GPL(phylink_set_pcs);
 889
 890 /**
 891  * phylink_destroy() - cleanup and destroy the phylink instance
 892  * @pl: a pointer to a &struct phylink returned from phylink_create()
 893  *
 894  * Destroy a phylink instance. Any PHY that has been attached must have been
 895  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 896  *
 897  * Note: the rtnl lock must not be held when calling this function.
 898  */
 899 void phylink_destroy(struct phylink *pl)
 900 {
 901         sfp_bus_del_upstream(pl->sfp_bus);
 902         if (pl->link_gpio)
 903                 gpiod_put(pl->link_gpio);
 904
 905         cancel_work_sync(&pl->resolve);
 906         kfree(pl);
 907 }
 908 EXPORT_SYMBOL_GPL(phylink_destroy);
 909
 910 static void phylink_phy_change(struct phy_device *phydev, bool up)
 911 {
 912         struct phylink *pl = phydev->phylink;
 913         bool tx_pause, rx_pause;
 914
 915         phy_get_pause(phydev, &tx_pause, &rx_pause);
 916
 917         mutex_lock(&pl->state_mutex);
 918         pl->phy_state.speed = phydev->speed;
 919         pl->phy_state.duplex = phydev->duplex;
 920         pl->phy_state.pause = MLO_PAUSE_NONE;
 921         if (tx_pause)
 922                 pl->phy_state.pause |= MLO_PAUSE_TX;
 923         if (rx_pause)
 924                 pl->phy_state.pause |= MLO_PAUSE_RX;
 925         pl->phy_state.interface = phydev->interface;
 926         pl->phy_state.link = up;
 927         mutex_unlock(&pl->state_mutex);
 928
 929         phylink_run_resolve(pl);
 930
 931         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 932                     phy_modes(phydev->interface),
 933                     phy_speed_to_str(phydev->speed),
 934                     phy_duplex_to_str(phydev->duplex));
 935 }
 936
 937 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 938                                phy_interface_t interface)
 939 {
 940         struct phylink_link_state config;
 941         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 942         char *irq_str;
 943         int ret;
 944
 945         /*
 946          * This is the new way of dealing with flow control for PHYs,
 947          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 948          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 949          * using our validate call to the MAC, we rely upon the MAC
 950          * clearing the bits from both supported and advertising fields.
 951          */
 952         phy_support_asym_pause(phy);
 953
 954         memset(&config, 0, sizeof(config));
 955         linkmode_copy(supported, phy->supported);
 956         linkmode_copy(config.advertising, phy->advertising);
 957
 958         /* Clause 45 PHYs switch their Serdes lane between several different
 959          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 960          * speeds. We really need to know which interface modes the PHY and
 961          * MAC supports to properly work out which linkmodes can be supported.
 962          */
 963         if (phy->is_c45 &&
 964             interface != PHY_INTERFACE_MODE_RXAUI &&
 965             interface != PHY_INTERFACE_MODE_XAUI &&
 966             interface != PHY_INTERFACE_MODE_USXGMII)
 967                 config.interface = PHY_INTERFACE_MODE_NA;
 968         else
 969                 config.interface = interface;
 970
 971         ret = phylink_validate(pl, supported, &config);
 972         if (ret) {
 973                 phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
 974                              phy_modes(config.interface),
 975                              __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
 976                              __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
 977                              ret);
 978                 return ret;
 979         }
 980
 981         phy->phylink = pl;
 982         phy->phy_link_change = phylink_phy_change;
 983
 984         irq_str = phy_attached_info_irq(phy);
 985         phylink_info(pl,
 986                      "PHY [%s] driver [%s] (irq=%s)\n",
 987                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
 988         kfree(irq_str);
 989
 990         mutex_lock(&phy->lock);
 991         mutex_lock(&pl->state_mutex);
 992         pl->phydev = phy;
 993         pl->phy_state.interface = interface;
 994         pl->phy_state.pause = MLO_PAUSE_NONE;
 995         pl->phy_state.speed = SPEED_UNKNOWN;
 996         pl->phy_state.duplex = DUPLEX_UNKNOWN;
 997         linkmode_copy(pl->supported, supported);
 998         linkmode_copy(pl->link_config.advertising, config.advertising);
 999
1000         /* Restrict the phy advertisement according to the MAC support. */
1001         linkmode_copy(phy->advertising, config.advertising);
1002         mutex_unlock(&pl->state_mutex);
1003         mutex_unlock(&phy->lock);
1004
1005         phylink_dbg(pl,
1006                     "phy: setting supported %*pb advertising %*pb\n",
1007                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
1008                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
1009
1010         if (phy_interrupt_is_valid(phy))
1011                 phy_request_interrupt(phy);
1012
1013         return 0;
1014 }
1015
1016 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
1017                               phy_interface_t interface)
1018 {
1019         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
1020                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1021                      phy_interface_mode_is_8023z(interface))))
1022                 return -EINVAL;
1023
1024         if (pl->phydev)
1025                 return -EBUSY;
1026
1027         return phy_attach_direct(pl->netdev, phy, 0, interface);
1028 }
1029
1030 /**
1031  * phylink_connect_phy() - connect a PHY to the phylink instance
1032  * @pl: a pointer to a &struct phylink returned from phylink_create()
1033  * @phy: a pointer to a &struct phy_device.
1034  *
1035  * Connect @phy to the phylink instance specified by @pl by calling
1036  * phy_attach_direct(). Configure the @phy according to the MAC driver's
1037  * capabilities, start the PHYLIB state machine and enable any interrupts
1038  * that the PHY supports.
1039  *
1040  * This updates the phylink's ethtool supported and advertising link mode
1041  * masks.
1042  *
1043  * Returns 0 on success or a negative errno.
1044  */
1045 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
1046 {
1047         int ret;
1048
1049         /* Use PHY device/driver interface */
1050         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1051                 pl->link_interface = phy->interface;
1052                 pl->link_config.interface = pl->link_interface;
1053         }
1054
1055         ret = phylink_attach_phy(pl, phy, pl->link_interface);
1056         if (ret < 0)
1057                 return ret;
1058
1059         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
1060         if (ret)
1061                 phy_detach(phy);
1062
1063         return ret;
1064 }
1065 EXPORT_SYMBOL_GPL(phylink_connect_phy);
1066
1067 /**
1068  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
1069  * @pl: a pointer to a &struct phylink returned from phylink_create()
1070  * @dn: a pointer to a &struct device_node.
1071  * @flags: PHY-specific flags to communicate to the PHY device driver
1072  *
1073  * Connect the phy specified in the device node @dn to the phylink instance
1074  * specified by @pl. Actions specified in phylink_connect_phy() will be
1075  * performed.
1076  *
1077  * Returns 0 on success or a negative errno.
1078  */
1079 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
1080                            u32 flags)
1081 {
1082         struct device_node *phy_node;
1083         struct phy_device *phy_dev;
1084         int ret;
1085
1086         /* Fixed links and 802.3z are handled without needing a PHY */
1087         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
1088             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1089              phy_interface_mode_is_8023z(pl->link_interface)))
1090                 return 0;
1091
1092         phy_node = of_parse_phandle(dn, "phy-handle", 0);
1093         if (!phy_node)
1094                 phy_node = of_parse_phandle(dn, "phy", 0);
1095         if (!phy_node)
1096                 phy_node = of_parse_phandle(dn, "phy-device", 0);
1097
1098         if (!phy_node) {
1099                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
1100                         return -ENODEV;
1101                 return 0;
1102         }
1103
1104         phy_dev = of_phy_find_device(phy_node);
1105         /* We're done with the phy_node handle */
1106         of_node_put(phy_node);
1107         if (!phy_dev)
1108                 return -ENODEV;
1109
1110         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
1111                                 pl->link_interface);
1112         if (ret)
1113                 return ret;
1114
1115         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
1116         if (ret)
1117                 phy_detach(phy_dev);
1118
1119         return ret;
1120 }
1121 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
1122
1123 /**
1124  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
1125  *   instance.
1126  * @pl: a pointer to a &struct phylink returned from phylink_create()
1127  *
1128  * Disconnect any current PHY from the phylink instance described by @pl.
1129  */
1130 void phylink_disconnect_phy(struct phylink *pl)
1131 {
1132         struct phy_device *phy;
1133
1134         ASSERT_RTNL();
1135
1136         phy = pl->phydev;
1137         if (phy) {
1138                 mutex_lock(&phy->lock);
1139                 mutex_lock(&pl->state_mutex);
1140                 pl->phydev = NULL;
1141                 mutex_unlock(&pl->state_mutex);
1142                 mutex_unlock(&phy->lock);
1143                 flush_work(&pl->resolve);
1144
1145                 phy_disconnect(phy);
1146         }
1147 }
1148 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
1149
1150 /**
1151  * phylink_mac_change() - notify phylink of a change in MAC state
1152  * @pl: a pointer to a &struct phylink returned from phylink_create()
1153  * @up: indicates whether the link is currently up.
1154  *
1155  * The MAC driver should call this driver when the state of its link
1156  * changes (eg, link failure, new negotiation results, etc.)
1157  */
1158 void phylink_mac_change(struct phylink *pl, bool up)
1159 {
1160         if (!up)
1161                 pl->mac_link_dropped = true;
1162         phylink_run_resolve(pl);
1163         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
1164 }
1165 EXPORT_SYMBOL_GPL(phylink_mac_change);
1166
1167 static irqreturn_t phylink_link_handler(int irq, void *data)
1168 {
1169         struct phylink *pl = data;
1170
1171         phylink_run_resolve(pl);
1172
1173         return IRQ_HANDLED;
1174 }
1175
1176 /**
1177  * phylink_start() - start a phylink instance
1178  * @pl: a pointer to a &struct phylink returned from phylink_create()
1179  *
1180  * Start the phylink instance specified by @pl, configuring the MAC for the
1181  * desired link mode(s) and negotiation style. This should be called from the
1182  * network device driver's &struct net_device_ops ndo_open() method.
1183  */
1184 void phylink_start(struct phylink *pl)
1185 {
1186         bool poll = false;
1187
1188         ASSERT_RTNL();
1189
1190         phylink_info(pl, "configuring for %s/%s link mode\n",
1191                      phylink_an_mode_str(pl->cur_link_an_mode),
1192                      phy_modes(pl->link_config.interface));
1193
1194         /* Always set the carrier off */
1195         if (pl->netdev)
1196                 netif_carrier_off(pl->netdev);
1197
1198         /* Apply the link configuration to the MAC when starting. This allows
1199          * a fixed-link to start with the correct parameters, and also
1200          * ensures that we set the appropriate advertisement for Serdes links.
1201          *
1202          * Restart autonegotiation if using 802.3z to ensure that the link
1203          * parameters are properly negotiated.  This is necessary for DSA
1204          * switches using 802.3z negotiation to ensure they see our modes.
1205          */
1206         phylink_mac_initial_config(pl, true);
1207
1208         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1209         phylink_run_resolve(pl);
1210
1211         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1212                 int irq = gpiod_to_irq(pl->link_gpio);
1213
1214                 if (irq > 0) {
1215                         if (!request_irq(irq, phylink_link_handler,
1216                                          IRQF_TRIGGER_RISING |
1217                                          IRQF_TRIGGER_FALLING,
1218                                          "netdev link", pl))
1219                                 pl->link_irq = irq;
1220                         else
1221                                 irq = 0;
1222                 }
1223                 if (irq <= 0)
1224                         poll = true;
1225         }
1226
1227         switch (pl->cfg_link_an_mode) {
1228         case MLO_AN_FIXED:
1229                 poll |= pl->config->poll_fixed_state;
1230                 break;
1231         case MLO_AN_INBAND:
1232                 poll |= pl->config->pcs_poll;
1233                 if (pl->pcs)
1234                         poll |= pl->pcs->poll;
1235                 break;
1236         }
1237         if (poll)
1238                 mod_timer(&pl->link_poll, jiffies + HZ);
1239         if (pl->phydev)
1240                 phy_start(pl->phydev);
1241         if (pl->sfp_bus)
1242                 sfp_upstream_start(pl->sfp_bus);
1243 }
1244 EXPORT_SYMBOL_GPL(phylink_start);
1245
1246 /**
1247  * phylink_stop() - stop a phylink instance
1248  * @pl: a pointer to a &struct phylink returned from phylink_create()
1249  *
1250  * Stop the phylink instance specified by @pl. This should be called from the
1251  * network device driver's &struct net_device_ops ndo_stop() method.  The
1252  * network device's carrier state should not be changed prior to calling this
1253  * function.
1254  */
1255 void phylink_stop(struct phylink *pl)
1256 {
1257         ASSERT_RTNL();
1258
1259         if (pl->sfp_bus)
1260                 sfp_upstream_stop(pl->sfp_bus);
1261         if (pl->phydev)
1262                 phy_stop(pl->phydev);
1263         del_timer_sync(&pl->link_poll);
1264         if (pl->link_irq) {
1265                 free_irq(pl->link_irq, pl);
1266                 pl->link_irq = 0;
1267         }
1268
1269         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1270 }
1271 EXPORT_SYMBOL_GPL(phylink_stop);
1272
1273 /**
1274  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1275  * @pl: a pointer to a &struct phylink returned from phylink_create()
1276  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1277  *
1278  * Read the wake on lan parameters from the PHY attached to the phylink
1279  * instance specified by @pl. If no PHY is currently attached, report no
1280  * support for wake on lan.
1281  */
1282 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1283 {
1284         ASSERT_RTNL();
1285
1286         wol->supported = 0;
1287         wol->wolopts = 0;
1288
1289         if (pl->phydev)
1290                 phy_ethtool_get_wol(pl->phydev, wol);
1291 }
1292 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1293
1294 /**
1295  * phylink_ethtool_set_wol() - set wake on lan parameters
1296  * @pl: a pointer to a &struct phylink returned from phylink_create()
1297  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1298  *
1299  * Set the wake on lan parameters for the PHY attached to the phylink
1300  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1301  * error.
1302  *
1303  * Returns zero on success or negative errno code.
1304  */
1305 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1306 {
1307         int ret = -EOPNOTSUPP;
1308
1309         ASSERT_RTNL();
1310
1311         if (pl->phydev)
1312                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1313
1314         return ret;
1315 }
1316 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1317
1318 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1319 {
1320         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1321
1322         linkmode_zero(mask);
1323         phylink_set_port_modes(mask);
1324
1325         linkmode_and(dst, dst, mask);
1326         linkmode_or(dst, dst, b);
1327 }
1328
1329 static void phylink_get_ksettings(const struct phylink_link_state *state,
1330                                   struct ethtool_link_ksettings *kset)
1331 {
1332         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1333         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1334         kset->base.speed = state->speed;
1335         kset->base.duplex = state->duplex;
1336         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1337                                 AUTONEG_DISABLE;
1338 }
1339
1340 /**
1341  * phylink_ethtool_ksettings_get() - get the current link settings
1342  * @pl: a pointer to a &struct phylink returned from phylink_create()
1343  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1344  *
1345  * Read the current link settings for the phylink instance specified by @pl.
1346  * This will be the link settings read from the MAC, PHY or fixed link
1347  * settings depending on the current negotiation mode.
1348  */
1349 int phylink_ethtool_ksettings_get(struct phylink *pl,
1350                                   struct ethtool_link_ksettings *kset)
1351 {
1352         struct phylink_link_state link_state;
1353
1354         ASSERT_RTNL();
1355
1356         if (pl->phydev) {
1357                 phy_ethtool_ksettings_get(pl->phydev, kset);
1358         } else {
1359                 kset->base.port = pl->link_port;
1360         }
1361
1362         linkmode_copy(kset->link_modes.supported, pl->supported);
1363
1364         switch (pl->cur_link_an_mode) {
1365         case MLO_AN_FIXED:
1366                 /* We are using fixed settings. Report these as the
1367                  * current link settings - and note that these also
1368                  * represent the supported speeds/duplex/pause modes.
1369                  */
1370                 phylink_get_fixed_state(pl, &link_state);
1371                 phylink_get_ksettings(&link_state, kset);
1372                 break;
1373
1374         case MLO_AN_INBAND:
1375                 /* If there is a phy attached, then use the reported
1376                  * settings from the phy with no modification.
1377                  */
1378                 if (pl->phydev)
1379                         break;
1380
1381                 phylink_mac_pcs_get_state(pl, &link_state);
1382
1383                 /* The MAC is reporting the link results from its own PCS
1384                  * layer via in-band status. Report these as the current
1385                  * link settings.
1386                  */
1387                 phylink_get_ksettings(&link_state, kset);
1388                 break;
1389         }
1390
1391         return 0;
1392 }
1393 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1394
1395 /**
1396  * phylink_ethtool_ksettings_set() - set the link settings
1397  * @pl: a pointer to a &struct phylink returned from phylink_create()
1398  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1399  */
1400 int phylink_ethtool_ksettings_set(struct phylink *pl,
1401                                   const struct ethtool_link_ksettings *kset)
1402 {
1403         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1404         struct phylink_link_state config;
1405         const struct phy_setting *s;
1406
1407         ASSERT_RTNL();
1408
1409         if (pl->phydev) {
1410                 /* We can rely on phylib for this update; we also do not need
1411                  * to update the pl->link_config settings:
1412                  * - the configuration returned via ksettings_get() will come
1413                  *   from phylib whenever a PHY is present.
1414                  * - link_config.interface will be updated by the PHY calling
1415                  *   back via phylink_phy_change() and a subsequent resolve.
1416                  * - initial link configuration for PHY mode comes from the
1417                  *   last phy state updated via phylink_phy_change().
1418                  * - other configuration changes (e.g. pause modes) are
1419                  *   performed directly via phylib.
1420                  * - if in in-band mode with a PHY, the link configuration
1421                  *   is passed on the link from the PHY, and all of
1422                  *   link_config.{speed,duplex,an_enabled,pause} are not used.
1423                  * - the only possible use would be link_config.advertising
1424                  *   pause modes when in 1000base-X mode with a PHY, but in
1425                  *   the presence of a PHY, this should not be changed as that
1426                  *   should be determined from the media side advertisement.
1427                  */
1428                 return phy_ethtool_ksettings_set(pl->phydev, kset);
1429         }
1430
1431         linkmode_copy(support, pl->supported);
1432         config = pl->link_config;
1433         config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
1434
1435         /* Mask out unsupported advertisements, and force the autoneg bit */
1436         linkmode_and(config.advertising, kset->link_modes.advertising,
1437                      support);
1438         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
1439                          config.an_enabled);
1440
1441         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1442         switch (kset->base.autoneg) {
1443         case AUTONEG_DISABLE:
1444                 /* Autonegotiation disabled, select a suitable speed and
1445                  * duplex.
1446                  */
1447                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1448                                        support, false);
1449                 if (!s)
1450                         return -EINVAL;
1451
1452                 /* If we have a fixed link, refuse to change link parameters.
1453                  * If the link parameters match, accept them but do nothing.
1454                  */
1455                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1456                         if (s->speed != pl->link_config.speed ||
1457                             s->duplex != pl->link_config.duplex)
1458                                 return -EINVAL;
1459                         return 0;
1460                 }
1461
1462                 config.speed = s->speed;
1463                 config.duplex = s->duplex;
1464                 break;
1465
1466         case AUTONEG_ENABLE:
1467                 /* If we have a fixed link, allow autonegotiation (since that
1468                  * is our default case) but do not allow the advertisement to
1469                  * be changed. If the advertisement matches, simply return.
1470                  */
1471                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1472                         if (!linkmode_equal(config.advertising,
1473                                             pl->link_config.advertising))
1474                                 return -EINVAL;
1475                         return 0;
1476                 }
1477
1478                 config.speed = SPEED_UNKNOWN;
1479                 config.duplex = DUPLEX_UNKNOWN;
1480                 break;
1481
1482         default:
1483                 return -EINVAL;
1484         }
1485
1486         /* We have ruled out the case with a PHY attached, and the
1487          * fixed-link cases.  All that is left are in-band links.
1488          */
1489         if (phylink_validate(pl, support, &config))
1490                 return -EINVAL;
1491
1492         /* If autonegotiation is enabled, we must have an advertisement */
1493         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
1494                 return -EINVAL;
1495
1496         mutex_lock(&pl->state_mutex);
1497         pl->link_config.speed = config.speed;
1498         pl->link_config.duplex = config.duplex;
1499         pl->link_config.an_enabled = config.an_enabled;
1500
1501         if (pl->link_config.interface != config.interface) {
1502                 /* The interface changed, e.g. 1000base-X <-> 2500base-X */
1503                 /* We need to force the link down, then change the interface */
1504                 if (pl->old_link_state) {
1505                         phylink_link_down(pl);
1506                         pl->old_link_state = false;
1507                 }
1508                 if (!test_bit(PHYLINK_DISABLE_STOPPED,
1509                               &pl->phylink_disable_state))
1510                         phylink_major_config(pl, false, &config);
1511                 pl->link_config.interface = config.interface;
1512                 linkmode_copy(pl->link_config.advertising, config.advertising);
1513         } else if (!linkmode_equal(pl->link_config.advertising,
1514                                    config.advertising)) {
1515                 linkmode_copy(pl->link_config.advertising, config.advertising);
1516                 phylink_change_inband_advert(pl);
1517         }
1518         mutex_unlock(&pl->state_mutex);
1519
1520         return 0;
1521 }
1522 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1523
1524 /**
1525  * phylink_ethtool_nway_reset() - restart negotiation
1526  * @pl: a pointer to a &struct phylink returned from phylink_create()
1527  *
1528  * Restart negotiation for the phylink instance specified by @pl. This will
1529  * cause any attached phy to restart negotiation with the link partner, and
1530  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1531  * negotiation.
1532  *
1533  * Returns zero on success, or negative error code.
1534  */
1535 int phylink_ethtool_nway_reset(struct phylink *pl)
1536 {
1537         int ret = 0;
1538
1539         ASSERT_RTNL();
1540
1541         if (pl->phydev)
1542                 ret = phy_restart_aneg(pl->phydev);
1543         phylink_mac_pcs_an_restart(pl);
1544
1545         return ret;
1546 }
1547 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1548
1549 /**
1550  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1551  * @pl: a pointer to a &struct phylink returned from phylink_create()
1552  * @pause: a pointer to a &struct ethtool_pauseparam
1553  */
1554 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1555                                     struct ethtool_pauseparam *pause)
1556 {
1557         ASSERT_RTNL();
1558
1559         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1560         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1561         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1562 }
1563 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1564
1565 /**
1566  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1567  * @pl: a pointer to a &struct phylink returned from phylink_create()
1568  * @pause: a pointer to a &struct ethtool_pauseparam
1569  */
1570 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1571                                    struct ethtool_pauseparam *pause)
1572 {
1573         struct phylink_link_state *config = &pl->link_config;
1574         bool manual_changed;
1575         int pause_state;
1576
1577         ASSERT_RTNL();
1578
1579         if (pl->cur_link_an_mode == MLO_AN_FIXED)
1580                 return -EOPNOTSUPP;
1581
1582         if (!phylink_test(pl->supported, Pause) &&
1583             !phylink_test(pl->supported, Asym_Pause))
1584                 return -EOPNOTSUPP;
1585
1586         if (!phylink_test(pl->supported, Asym_Pause) &&
1587             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1588                 return -EINVAL;
1589
1590         pause_state = 0;
1591         if (pause->autoneg)
1592                 pause_state |= MLO_PAUSE_AN;
1593         if (pause->rx_pause)
1594                 pause_state |= MLO_PAUSE_RX;
1595         if (pause->tx_pause)
1596                 pause_state |= MLO_PAUSE_TX;
1597
1598         mutex_lock(&pl->state_mutex);
1599         /*
1600          * See the comments for linkmode_set_pause(), wrt the deficiencies
1601          * with the current implementation.  A solution to this issue would
1602          * be:
1603          * ethtool  Local device
1604          *  rx  tx  Pause AsymDir
1605          *  0   0   0     0
1606          *  1   0   1     1
1607          *  0   1   0     1
1608          *  1   1   1     1
1609          * and then use the ethtool rx/tx enablement status to mask the
1610          * rx/tx pause resolution.
1611          */
1612         linkmode_set_pause(config->advertising, pause->tx_pause,
1613                            pause->rx_pause);
1614
1615         manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
1616                          (!(pause_state & MLO_PAUSE_AN) &&
1617                            (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);
1618
1619         config->pause = pause_state;
1620
1621         /* Update our in-band advertisement, triggering a renegotiation if
1622          * the advertisement changed.
1623          */
1624         if (!pl->phydev)
1625                 phylink_change_inband_advert(pl);
1626
1627         mutex_unlock(&pl->state_mutex);
1628
1629         /* If we have a PHY, a change of the pause frame advertisement will
1630          * cause phylib to renegotiate (if AN is enabled) which will in turn
1631          * call our phylink_phy_change() and trigger a resolve.  Note that
1632          * we can't hold our state mutex while calling phy_set_asym_pause().
1633          */
1634         if (pl->phydev)
1635                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1636                                    pause->tx_pause);
1637
1638         /* If the manual pause settings changed, make sure we trigger a
1639          * resolve to update their state; we can not guarantee that the
1640          * link will cycle.
1641          */
1642         if (manual_changed) {
1643                 pl->mac_link_dropped = true;
1644                 phylink_run_resolve(pl);
1645         }
1646
1647         return 0;
1648 }
1649 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1650
1651 /**
1652  * phylink_get_eee_err() - read the energy efficient ethernet error
1653  *   counter
1654  * @pl: a pointer to a &struct phylink returned from phylink_create().
1655  *
1656  * Read the Energy Efficient Ethernet error counter from the PHY associated
1657  * with the phylink instance specified by @pl.
1658  *
1659  * Returns positive error counter value, or negative error code.
1660  */
1661 int phylink_get_eee_err(struct phylink *pl)
1662 {
1663         int ret = 0;
1664
1665         ASSERT_RTNL();
1666
1667         if (pl->phydev)
1668                 ret = phy_get_eee_err(pl->phydev);
1669
1670         return ret;
1671 }
1672 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1673
1674 /**
1675  * phylink_init_eee() - init and check the EEE features
1676  * @pl: a pointer to a &struct phylink returned from phylink_create()
1677  * @clk_stop_enable: allow PHY to stop receive clock
1678  *
1679  * Must be called either with RTNL held or within mac_link_up()
1680  */
1681 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1682 {
1683         int ret = -EOPNOTSUPP;
1684
1685         if (pl->phydev)
1686                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1687
1688         return ret;
1689 }
1690 EXPORT_SYMBOL_GPL(phylink_init_eee);
1691
1692 /**
1693  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1694  * @pl: a pointer to a &struct phylink returned from phylink_create()
1695  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1696  */
1697 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1698 {
1699         int ret = -EOPNOTSUPP;
1700
1701         ASSERT_RTNL();
1702
1703         if (pl->phydev)
1704                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1705
1706         return ret;
1707 }
1708 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1709
1710 /**
1711  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1712  * @pl: a pointer to a &struct phylink returned from phylink_create()
1713  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1714  */
1715 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1716 {
1717         int ret = -EOPNOTSUPP;
1718
1719         ASSERT_RTNL();
1720
1721         if (pl->phydev)
1722                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1723
1724         return ret;
1725 }
1726 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1727
1728 /* This emulates MII registers for a fixed-mode phy operating as per the
1729  * passed in state. "aneg" defines if we report negotiation is possible.
1730  *
1731  * FIXME: should deal with negotiation state too.
1732  */
1733 static int phylink_mii_emul_read(unsigned int reg,
1734                                  struct phylink_link_state *state)
1735 {
1736         struct fixed_phy_status fs;
1737         unsigned long *lpa = state->lp_advertising;
1738         int val;
1739
1740         fs.link = state->link;
1741         fs.speed = state->speed;
1742         fs.duplex = state->duplex;
1743         fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
1744         fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
1745
1746         val = swphy_read_reg(reg, &fs);
1747         if (reg == MII_BMSR) {
1748                 if (!state->an_complete)
1749                         val &= ~BMSR_ANEGCOMPLETE;
1750         }
1751         return val;
1752 }
1753
1754 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1755                             unsigned int reg)
1756 {
1757         struct phy_device *phydev = pl->phydev;
1758         int prtad, devad;
1759
1760         if (mdio_phy_id_is_c45(phy_id)) {
1761                 prtad = mdio_phy_id_prtad(phy_id);
1762                 devad = mdio_phy_id_devad(phy_id);
1763                 devad = mdiobus_c45_addr(devad, reg);
1764         } else if (phydev->is_c45) {
1765                 switch (reg) {
1766                 case MII_BMCR:
1767                 case MII_BMSR:
1768                 case MII_PHYSID1:
1769                 case MII_PHYSID2:
1770                         devad = __ffs(phydev->c45_ids.mmds_present);
1771                         break;
1772                 case MII_ADVERTISE:
1773                 case MII_LPA:
1774                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1775                                 return -EINVAL;
1776                         devad = MDIO_MMD_AN;
1777                         if (reg == MII_ADVERTISE)
1778                                 reg = MDIO_AN_ADVERTISE;
1779                         else
1780                                 reg = MDIO_AN_LPA;
1781                         break;
1782                 default:
1783                         return -EINVAL;
1784                 }
1785                 prtad = phy_id;
1786                 devad = mdiobus_c45_addr(devad, reg);
1787         } else {
1788                 prtad = phy_id;
1789                 devad = reg;
1790         }
1791         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1792 }
1793
1794 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1795                              unsigned int reg, unsigned int val)
1796 {
1797         struct phy_device *phydev = pl->phydev;
1798         int prtad, devad;
1799
1800         if (mdio_phy_id_is_c45(phy_id)) {
1801                 prtad = mdio_phy_id_prtad(phy_id);
1802                 devad = mdio_phy_id_devad(phy_id);
1803                 devad = mdiobus_c45_addr(devad, reg);
1804         } else if (phydev->is_c45) {
1805                 switch (reg) {
1806                 case MII_BMCR:
1807                 case MII_BMSR:
1808                 case MII_PHYSID1:
1809                 case MII_PHYSID2:
1810                         devad = __ffs(phydev->c45_ids.mmds_present);
1811                         break;
1812                 case MII_ADVERTISE:
1813                 case MII_LPA:
1814                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1815                                 return -EINVAL;
1816                         devad = MDIO_MMD_AN;
1817                         if (reg == MII_ADVERTISE)
1818                                 reg = MDIO_AN_ADVERTISE;
1819                         else
1820                                 reg = MDIO_AN_LPA;
1821                         break;
1822                 default:
1823                         return -EINVAL;
1824                 }
1825                 prtad = phy_id;
1826                 devad = mdiobus_c45_addr(devad, reg);
1827         } else {
1828                 prtad = phy_id;
1829                 devad = reg;
1830         }
1831
1832         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1833 }
1834
1835 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1836                             unsigned int reg)
1837 {
1838         struct phylink_link_state state;
1839         int val = 0xffff;
1840
1841         switch (pl->cur_link_an_mode) {
1842         case MLO_AN_FIXED:
1843                 if (phy_id == 0) {
1844                         phylink_get_fixed_state(pl, &state);
1845                         val = phylink_mii_emul_read(reg, &state);
1846                 }
1847                 break;
1848
1849         case MLO_AN_PHY:
1850                 return -EOPNOTSUPP;
1851
1852         case MLO_AN_INBAND:
1853                 if (phy_id == 0) {
1854                         phylink_mac_pcs_get_state(pl, &state);
1855                         val = phylink_mii_emul_read(reg, &state);
1856                 }
1857                 break;
1858         }
1859
1860         return val & 0xffff;
1861 }
1862
1863 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1864                              unsigned int reg, unsigned int val)
1865 {
1866         switch (pl->cur_link_an_mode) {
1867         case MLO_AN_FIXED:
1868                 break;
1869
1870         case MLO_AN_PHY:
1871                 return -EOPNOTSUPP;
1872
1873         case MLO_AN_INBAND:
1874                 break;
1875         }
1876
1877         return 0;
1878 }
1879
1880 /**
1881  * phylink_mii_ioctl() - generic mii ioctl interface
1882  * @pl: a pointer to a &struct phylink returned from phylink_create()
1883  * @ifr: a pointer to a &struct ifreq for socket ioctls
1884  * @cmd: ioctl cmd to execute
1885  *
1886  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1887  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1888  *
1889  * Returns: zero on success or negative error code.
1890  *
1891  * %SIOCGMIIPHY:
1892  *  read register from the current PHY.
1893  * %SIOCGMIIREG:
1894  *  read register from the specified PHY.
1895  * %SIOCSMIIREG:
1896  *  set a register on the specified PHY.
1897  */
1898 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1899 {
1900         struct mii_ioctl_data *mii = if_mii(ifr);
1901         int  ret;
1902
1903         ASSERT_RTNL();
1904
1905         if (pl->phydev) {
1906                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1907                 switch (cmd) {
1908                 case SIOCGMIIPHY:
1909                         mii->phy_id = pl->phydev->mdio.addr;
1910                         fallthrough;
1911
1912                 case SIOCGMIIREG:
1913                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1914                         if (ret >= 0) {
1915                                 mii->val_out = ret;
1916                                 ret = 0;
1917                         }
1918                         break;
1919
1920                 case SIOCSMIIREG:
1921                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1922                                                 mii->val_in);
1923                         break;
1924
1925                 default:
1926                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1927                         break;
1928                 }
1929         } else {
1930                 switch (cmd) {
1931                 case SIOCGMIIPHY:
1932                         mii->phy_id = 0;
1933                         fallthrough;
1934
1935                 case SIOCGMIIREG:
1936                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1937                         if (ret >= 0) {
1938                                 mii->val_out = ret;
1939                                 ret = 0;
1940                         }
1941                         break;
1942
1943                 case SIOCSMIIREG:
1944                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1945                                                 mii->val_in);
1946                         break;
1947
1948                 default:
1949                         ret = -EOPNOTSUPP;
1950                         break;
1951                 }
1952         }
1953
1954         return ret;
1955 }
1956 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1957
1958 /**
1959  * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
1960  *   link partners
1961  * @pl: a pointer to a &struct phylink returned from phylink_create()
1962  * @sync: perform action synchronously
1963  *
1964  * If we have a PHY that is not part of a SFP module, then set the speed
1965  * as described in the phy_speed_down() function. Please see this function
1966  * for a description of the @sync parameter.
1967  *
1968  * Returns zero if there is no PHY, otherwise as per phy_speed_down().
1969  */
1970 int phylink_speed_down(struct phylink *pl, bool sync)
1971 {
1972         int ret = 0;
1973
1974         ASSERT_RTNL();
1975
1976         if (!pl->sfp_bus && pl->phydev)
1977                 ret = phy_speed_down(pl->phydev, sync);
1978
1979         return ret;
1980 }
1981 EXPORT_SYMBOL_GPL(phylink_speed_down);
1982
1983 /**
1984  * phylink_speed_up() - restore the advertised speeds prior to the call to
1985  *   phylink_speed_down()
1986  * @pl: a pointer to a &struct phylink returned from phylink_create()
1987  *
1988  * If we have a PHY that is not part of a SFP module, then restore the
1989  * PHY speeds as per phy_speed_up().
1990  *
1991  * Returns zero if there is no PHY, otherwise as per phy_speed_up().
1992  */
1993 int phylink_speed_up(struct phylink *pl)
1994 {
1995         int ret = 0;
1996
1997         ASSERT_RTNL();
1998
1999         if (!pl->sfp_bus && pl->phydev)
2000                 ret = phy_speed_up(pl->phydev);
2001
2002         return ret;
2003 }
2004 EXPORT_SYMBOL_GPL(phylink_speed_up);
2005
2006 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
2007 {
2008         struct phylink *pl = upstream;
2009
2010         pl->netdev->sfp_bus = bus;
2011 }
2012
2013 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
2014 {
2015         struct phylink *pl = upstream;
2016
2017         pl->netdev->sfp_bus = NULL;
2018 }
2019
2020 static int phylink_sfp_config(struct phylink *pl, u8 mode,
2021                               const unsigned long *supported,
2022                               const unsigned long *advertising)
2023 {
2024         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
2025         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
2026         struct phylink_link_state config;
2027         phy_interface_t iface;
2028         bool changed;
2029         int ret;
2030
2031         linkmode_copy(support, supported);
2032
2033         memset(&config, 0, sizeof(config));
2034         linkmode_copy(config.advertising, advertising);
2035         config.interface = PHY_INTERFACE_MODE_NA;
2036         config.speed = SPEED_UNKNOWN;
2037         config.duplex = DUPLEX_UNKNOWN;
2038         config.pause = MLO_PAUSE_AN;
2039         config.an_enabled = pl->link_config.an_enabled;
2040
2041         /* Ignore errors if we're expecting a PHY to attach later */
2042         ret = phylink_validate(pl, support, &config);
2043         if (ret) {
2044                 phylink_err(pl, "validation with support %*pb failed: %d\n",
2045                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2046                 return ret;
2047         }
2048
2049         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
2050         if (iface == PHY_INTERFACE_MODE_NA) {
2051                 phylink_err(pl,
2052                             "selection of interface failed, advertisement %*pb\n",
2053                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
2054                 return -EINVAL;
2055         }
2056
2057         config.interface = iface;
2058         linkmode_copy(support1, support);
2059         ret = phylink_validate(pl, support1, &config);
2060         if (ret) {
2061                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
2062                             phylink_an_mode_str(mode),
2063                             phy_modes(config.interface),
2064                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2065                 return ret;
2066         }
2067
2068         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
2069                     phylink_an_mode_str(mode), phy_modes(config.interface),
2070                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2071
2072         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
2073                 return -EINVAL;
2074
2075         changed = !linkmode_equal(pl->supported, support);
2076         if (changed) {
2077                 linkmode_copy(pl->supported, support);
2078                 linkmode_copy(pl->link_config.advertising, config.advertising);
2079         }
2080
2081         if (pl->cur_link_an_mode != mode ||
2082             pl->link_config.interface != config.interface) {
2083                 pl->link_config.interface = config.interface;
2084                 pl->cur_link_an_mode = mode;
2085
2086                 changed = true;
2087
2088                 phylink_info(pl, "switched to %s/%s link mode\n",
2089                              phylink_an_mode_str(mode),
2090                              phy_modes(config.interface));
2091         }
2092
2093         pl->link_port = pl->sfp_port;
2094
2095         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
2096                                  &pl->phylink_disable_state))
2097                 phylink_mac_initial_config(pl, false);
2098
2099         return ret;
2100 }
2101
2102 static int phylink_sfp_module_insert(void *upstream,
2103                                      const struct sfp_eeprom_id *id)
2104 {
2105         struct phylink *pl = upstream;
2106         unsigned long *support = pl->sfp_support;
2107
2108         ASSERT_RTNL();
2109
2110         linkmode_zero(support);
2111         sfp_parse_support(pl->sfp_bus, id, support);
2112         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
2113
2114         /* If this module may have a PHY connecting later, defer until later */
2115         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
2116         if (pl->sfp_may_have_phy)
2117                 return 0;
2118
2119         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
2120 }
2121
2122 static int phylink_sfp_module_start(void *upstream)
2123 {
2124         struct phylink *pl = upstream;
2125
2126         /* If this SFP module has a PHY, start the PHY now. */
2127         if (pl->phydev) {
2128                 phy_start(pl->phydev);
2129                 return 0;
2130         }
2131
2132         /* If the module may have a PHY but we didn't detect one we
2133          * need to configure the MAC here.
2134          */
2135         if (!pl->sfp_may_have_phy)
2136                 return 0;
2137
2138         return phylink_sfp_config(pl, MLO_AN_INBAND,
2139                                   pl->sfp_support, pl->sfp_support);
2140 }
2141
2142 static void phylink_sfp_module_stop(void *upstream)
2143 {
2144         struct phylink *pl = upstream;
2145
2146         /* If this SFP module has a PHY, stop it. */
2147         if (pl->phydev)
2148                 phy_stop(pl->phydev);
2149 }
2150
2151 static void phylink_sfp_link_down(void *upstream)
2152 {
2153         struct phylink *pl = upstream;
2154
2155         ASSERT_RTNL();
2156
2157         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
2158 }
2159
2160 static void phylink_sfp_link_up(void *upstream)
2161 {
2162         struct phylink *pl = upstream;
2163
2164         ASSERT_RTNL();
2165
2166         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
2167         phylink_run_resolve(pl);
2168 }
2169
2170 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
2171  * or 802.3z control word, so inband will not work.
2172  */
2173 static bool phylink_phy_no_inband(struct phy_device *phy)
2174 {
2175         return phy->is_c45 &&
2176                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
2177 }
2178
2179 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
2180 {
2181         struct phylink *pl = upstream;
2182         phy_interface_t interface;
2183         u8 mode;
2184         int ret;
2185
2186         /*
2187          * This is the new way of dealing with flow control for PHYs,
2188          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
2189          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
2190          * using our validate call to the MAC, we rely upon the MAC
2191          * clearing the bits from both supported and advertising fields.
2192          */
2193         phy_support_asym_pause(phy);
2194
2195         if (phylink_phy_no_inband(phy))
2196                 mode = MLO_AN_PHY;
2197         else
2198                 mode = MLO_AN_INBAND;
2199
2200         /* Do the initial configuration */
2201         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
2202         if (ret < 0)
2203                 return ret;
2204
2205         interface = pl->link_config.interface;
2206         ret = phylink_attach_phy(pl, phy, interface);
2207         if (ret < 0)
2208                 return ret;
2209
2210         ret = phylink_bringup_phy(pl, phy, interface);
2211         if (ret)
2212                 phy_detach(phy);
2213
2214         return ret;
2215 }
2216
2217 static void phylink_sfp_disconnect_phy(void *upstream)
2218 {
2219         phylink_disconnect_phy(upstream);
2220 }
2221
2222 static const struct sfp_upstream_ops sfp_phylink_ops = {
2223         .attach = phylink_sfp_attach,
2224         .detach = phylink_sfp_detach,
2225         .module_insert = phylink_sfp_module_insert,
2226         .module_start = phylink_sfp_module_start,
2227         .module_stop = phylink_sfp_module_stop,
2228         .link_up = phylink_sfp_link_up,
2229         .link_down = phylink_sfp_link_down,
2230         .connect_phy = phylink_sfp_connect_phy,
2231         .disconnect_phy = phylink_sfp_disconnect_phy,
2232 };
2233
2234 /* Helpers for MAC drivers */
2235
2236 /**
2237  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
2238  * @state: a pointer to a &struct phylink_link_state
2239  *
2240  * Inspect the interface mode, advertising mask or forced speed and
2241  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
2242  * the interface mode to suit.  @state->interface is appropriately
2243  * updated, and the advertising mask has the "other" baseX_Full flag
2244  * cleared.
2245  */
2246 void phylink_helper_basex_speed(struct phylink_link_state *state)
2247 {
2248         if (phy_interface_mode_is_8023z(state->interface)) {
2249                 bool want_2500 = state->an_enabled ?
2250                         phylink_test(state->advertising, 2500baseX_Full) :
2251                         state->speed == SPEED_2500;
2252
2253                 if (want_2500) {
2254                         phylink_clear(state->advertising, 1000baseX_Full);
2255                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
2256                 } else {
2257                         phylink_clear(state->advertising, 2500baseX_Full);
2258                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
2259                 }
2260         }
2261 }
2262 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
2263
2264 static void phylink_decode_c37_word(struct phylink_link_state *state,
2265                                     uint16_t config_reg, int speed)
2266 {
2267         bool tx_pause, rx_pause;
2268         int fd_bit;
2269
2270         if (speed == SPEED_2500)
2271                 fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
2272         else
2273                 fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
2274
2275         mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
2276
2277         if (linkmode_test_bit(fd_bit, state->advertising) &&
2278             linkmode_test_bit(fd_bit, state->lp_advertising)) {
2279                 state->speed = speed;
2280                 state->duplex = DUPLEX_FULL;
2281         } else {
2282                 /* negotiation failure */
2283                 state->link = false;
2284         }
2285
2286         linkmode_resolve_pause(state->advertising, state->lp_advertising,
2287                                &tx_pause, &rx_pause);
2288
2289         if (tx_pause)
2290                 state->pause |= MLO_PAUSE_TX;
2291         if (rx_pause)
2292                 state->pause |= MLO_PAUSE_RX;
2293 }
2294
2295 static void phylink_decode_sgmii_word(struct phylink_link_state *state,
2296                                       uint16_t config_reg)
2297 {
2298         if (!(config_reg & LPA_SGMII_LINK)) {
2299                 state->link = false;
2300                 return;
2301         }
2302
2303         switch (config_reg & LPA_SGMII_SPD_MASK) {
2304         case LPA_SGMII_10:
2305                 state->speed = SPEED_10;
2306                 break;
2307         case LPA_SGMII_100:
2308                 state->speed = SPEED_100;
2309                 break;
2310         case LPA_SGMII_1000:
2311                 state->speed = SPEED_1000;
2312                 break;
2313         default:
2314                 state->link = false;
2315                 return;
2316         }
2317         if (config_reg & LPA_SGMII_FULL_DUPLEX)
2318                 state->duplex = DUPLEX_FULL;
2319         else
2320                 state->duplex = DUPLEX_HALF;
2321 }
2322
2323 /**
2324  * phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
2325  * @state: a pointer to a struct phylink_link_state.
2326  * @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
2327  *
2328  * Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
2329  * code word.  Decode the USXGMII code word and populate the corresponding fields
2330  * (speed, duplex) into the phylink_link_state structure.
2331  */
2332 void phylink_decode_usxgmii_word(struct phylink_link_state *state,
2333                                  uint16_t lpa)
2334 {
2335         switch (lpa & MDIO_USXGMII_SPD_MASK) {
2336         case MDIO_USXGMII_10:
2337                 state->speed = SPEED_10;
2338                 break;
2339         case MDIO_USXGMII_100:
2340                 state->speed = SPEED_100;
2341                 break;
2342         case MDIO_USXGMII_1000:
2343                 state->speed = SPEED_1000;
2344                 break;
2345         case MDIO_USXGMII_2500:
2346                 state->speed = SPEED_2500;
2347                 break;
2348         case MDIO_USXGMII_5000:
2349                 state->speed = SPEED_5000;
2350                 break;
2351         case MDIO_USXGMII_10G:
2352                 state->speed = SPEED_10000;
2353                 break;
2354         default:
2355                 state->link = false;
2356                 return;
2357         }
2358
2359         if (lpa & MDIO_USXGMII_FULL_DUPLEX)
2360                 state->duplex = DUPLEX_FULL;
2361         else
2362                 state->duplex = DUPLEX_HALF;
2363 }
2364 EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
2365
2366 /**
2367  * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
2368  * @pcs: a pointer to a &struct mdio_device.
2369  * @state: a pointer to a &struct phylink_link_state.
2370  *
2371  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2372  * clause 37 negotiation and/or SGMII control.
2373  *
2374  * Read the MAC PCS state from the MII device configured in @config and
2375  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
2376  * the phylink @state structure. This is suitable to be directly plugged
2377  * into the mac_pcs_get_state() member of the struct phylink_mac_ops
2378  * structure.
2379  */
2380 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
2381                                    struct phylink_link_state *state)
2382 {
2383         struct mii_bus *bus = pcs->bus;
2384         int addr = pcs->addr;
2385         int bmsr, lpa;
2386
2387         bmsr = mdiobus_read(bus, addr, MII_BMSR);
2388         lpa = mdiobus_read(bus, addr, MII_LPA);
2389         if (bmsr < 0 || lpa < 0) {
2390                 state->link = false;
2391                 return;
2392         }
2393
2394         state->link = !!(bmsr & BMSR_LSTATUS);
2395         state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
2396         if (!state->link)
2397                 return;
2398
2399         switch (state->interface) {
2400         case PHY_INTERFACE_MODE_1000BASEX:
2401                 phylink_decode_c37_word(state, lpa, SPEED_1000);
2402                 break;
2403
2404         case PHY_INTERFACE_MODE_2500BASEX:
2405                 phylink_decode_c37_word(state, lpa, SPEED_2500);
2406                 break;
2407
2408         case PHY_INTERFACE_MODE_SGMII:
2409         case PHY_INTERFACE_MODE_QSGMII:
2410                 phylink_decode_sgmii_word(state, lpa);
2411                 break;
2412
2413         default:
2414                 state->link = false;
2415                 break;
2416         }
2417 }
2418 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
2419
2420 /**
2421  * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
2422  *      advertisement
2423  * @pcs: a pointer to a &struct mdio_device.
2424  * @interface: the PHY interface mode being configured
2425  * @advertising: the ethtool advertisement mask
2426  *
2427  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2428  * clause 37 negotiation and/or SGMII control.
2429  *
2430  * Configure the clause 37 PCS advertisement as specified by @state. This
2431  * does not trigger a renegotiation; phylink will do that via the
2432  * mac_an_restart() method of the struct phylink_mac_ops structure.
2433  *
2434  * Returns negative error code on failure to configure the advertisement,
2435  * zero if no change has been made, or one if the advertisement has changed.
2436  */
2437 int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
2438                                           phy_interface_t interface,
2439                                           const unsigned long *advertising)
2440 {
2441         struct mii_bus *bus = pcs->bus;
2442         int addr = pcs->addr;
2443         int val, ret;
2444         u16 adv;
2445
2446         switch (interface) {
2447         case PHY_INTERFACE_MODE_1000BASEX:
2448         case PHY_INTERFACE_MODE_2500BASEX:
2449                 adv = ADVERTISE_1000XFULL;
2450                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
2451                                       advertising))
2452                         adv |= ADVERTISE_1000XPAUSE;
2453                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
2454                                       advertising))
2455                         adv |= ADVERTISE_1000XPSE_ASYM;
2456
2457                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2458                 if (val < 0)
2459                         return val;
2460
2461                 if (val == adv)
2462                         return 0;
2463
2464                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
2465                 if (ret < 0)
2466                         return ret;
2467
2468                 return 1;
2469
2470         case PHY_INTERFACE_MODE_SGMII:
2471                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2472                 if (val < 0)
2473                         return val;
2474
2475                 if (val == 0x0001)
2476                         return 0;
2477
2478                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
2479                 if (ret < 0)
2480                         return ret;
2481
2482                 return 1;
2483
2484         default:
2485                 /* Nothing to do for other modes */
2486                 return 0;
2487         }
2488 }
2489 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);
2490
2491 /**
2492  * phylink_mii_c22_pcs_config() - configure clause 22 PCS
2493  * @pcs: a pointer to a &struct mdio_device.
2494  * @mode: link autonegotiation mode
2495  * @interface: the PHY interface mode being configured
2496  * @advertising: the ethtool advertisement mask
2497  *
2498  * Configure a Clause 22 PCS PHY with the appropriate negotiation
2499  * parameters for the @mode, @interface and @advertising parameters.
2500  * Returns negative error number on failure, zero if the advertisement
2501  * has not changed, or positive if there is a change.
2502  */
2503 int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
2504                                phy_interface_t interface,
2505                                const unsigned long *advertising)
2506 {
2507         bool changed;
2508         u16 bmcr;
2509         int ret;
2510
2511         ret = phylink_mii_c22_pcs_set_advertisement(pcs, interface,
2512                                                     advertising);
2513         if (ret < 0)
2514                 return ret;
2515
2516         changed = ret > 0;
2517
2518         /* Ensure ISOLATE bit is disabled */
2519         bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
2520         ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
2521                              BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
2522         if (ret < 0)
2523                 return ret;
2524
2525         return changed ? 1 : 0;
2526 }
2527 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
2528
2529 /**
2530  * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
2531  * @pcs: a pointer to a &struct mdio_device.
2532  *
2533  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2534  * clause 37 negotiation.
2535  *
2536  * Restart the clause 37 negotiation with the link partner. This is
2537  * suitable to be directly plugged into the mac_pcs_get_state() member
2538  * of the struct phylink_mac_ops structure.
2539  */
2540 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
2541 {
2542         struct mii_bus *bus = pcs->bus;
2543         int val, addr = pcs->addr;
2544
2545         val = mdiobus_read(bus, addr, MII_BMCR);
2546         if (val >= 0) {
2547                 val |= BMCR_ANRESTART;
2548
2549                 mdiobus_write(bus, addr, MII_BMCR, val);
2550         }
2551 }
2552 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
2553
2554 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
2555                                    struct phylink_link_state *state)
2556 {
2557         struct mii_bus *bus = pcs->bus;
2558         int addr = pcs->addr;
2559         int stat;
2560
2561         stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
2562         if (stat < 0) {
2563                 state->link = false;
2564                 return;
2565         }
2566
2567         state->link = !!(stat & MDIO_STAT1_LSTATUS);
2568         if (!state->link)
2569                 return;
2570
2571         switch (state->interface) {
2572         case PHY_INTERFACE_MODE_10GBASER:
2573                 state->speed = SPEED_10000;
2574                 state->duplex = DUPLEX_FULL;
2575                 break;
2576
2577         default:
2578                 break;
2579         }
2580 }
2581 EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);
2582
2583 MODULE_LICENSE("GPL v2");