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
 539                 pl->mac_ops->mac_pcs_get_state(pl->config, state);
 540 }
 541
 542 /* The fixed state is... fixed except for the link state,
 543  * which may be determined by a GPIO or a callback.
 544  */
 545 static void phylink_get_fixed_state(struct phylink *pl,
 546                                     struct phylink_link_state *state)
 547 {
 548         *state = pl->link_config;
 549         if (pl->config->get_fixed_state)
 550                 pl->config->get_fixed_state(pl->config, state);
 551         else if (pl->link_gpio)
 552                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 553
 554         phylink_resolve_flow(state);
 555 }
 556
 557 static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
 558 {
 559         struct phylink_link_state link_state;
 560
 561         switch (pl->cur_link_an_mode) {
 562         case MLO_AN_PHY:
 563                 link_state = pl->phy_state;
 564                 break;
 565
 566         case MLO_AN_FIXED:
 567                 phylink_get_fixed_state(pl, &link_state);
 568                 break;
 569
 570         case MLO_AN_INBAND:
 571                 link_state = pl->link_config;
 572                 if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
 573                         link_state.pause = MLO_PAUSE_NONE;
 574                 break;
 575
 576         default: /* can't happen */
 577                 return;
 578         }
 579
 580         link_state.link = false;
 581
 582         phylink_apply_manual_flow(pl, &link_state);
 583         phylink_major_config(pl, force_restart, &link_state);
 584 }
 585
 586 static const char *phylink_pause_to_str(int pause)
 587 {
 588         switch (pause & MLO_PAUSE_TXRX_MASK) {
 589         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 590                 return "rx/tx";
 591         case MLO_PAUSE_TX:
 592                 return "tx";
 593         case MLO_PAUSE_RX:
 594                 return "rx";
 595         default:
 596                 return "off";
 597         }
 598 }
 599
 600 static void phylink_link_up(struct phylink *pl,
 601                             struct phylink_link_state link_state)
 602 {
 603         struct net_device *ndev = pl->netdev;
 604
 605         pl->cur_interface = link_state.interface;
 606
 607         if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
 608                 pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
 609                                          pl->cur_interface,
 610                                          link_state.speed, link_state.duplex);
 611
 612         pl->mac_ops->mac_link_up(pl->config, pl->phydev,
 613                                  pl->cur_link_an_mode, pl->cur_interface,
 614                                  link_state.speed, link_state.duplex,
 615                                  !!(link_state.pause & MLO_PAUSE_TX),
 616                                  !!(link_state.pause & MLO_PAUSE_RX));
 617
 618         if (ndev)
 619                 netif_carrier_on(ndev);
 620
 621         phylink_info(pl,
 622                      "Link is Up - %s/%s - flow control %s\n",
 623                      phy_speed_to_str(link_state.speed),
 624                      phy_duplex_to_str(link_state.duplex),
 625                      phylink_pause_to_str(link_state.pause));
 626 }
 627
 628 static void phylink_link_down(struct phylink *pl)
 629 {
 630         struct net_device *ndev = pl->netdev;
 631
 632         if (ndev)
 633                 netif_carrier_off(ndev);
 634         pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 635                                    pl->cur_interface);
 636         phylink_info(pl, "Link is Down\n");
 637 }
 638
 639 static void phylink_resolve(struct work_struct *w)
 640 {
 641         struct phylink *pl = container_of(w, struct phylink, resolve);
 642         struct phylink_link_state link_state;
 643         struct net_device *ndev = pl->netdev;
 644         bool mac_config = false;
 645         bool cur_link_state;
 646
 647         mutex_lock(&pl->state_mutex);
 648         if (pl->netdev)
 649                 cur_link_state = netif_carrier_ok(ndev);
 650         else
 651                 cur_link_state = pl->old_link_state;
 652
 653         if (pl->phylink_disable_state) {
 654                 pl->mac_link_dropped = false;
 655                 link_state.link = false;
 656         } else if (pl->mac_link_dropped) {
 657                 link_state.link = false;
 658         } else {
 659                 switch (pl->cur_link_an_mode) {
 660                 case MLO_AN_PHY:
 661                         link_state = pl->phy_state;
 662                         phylink_apply_manual_flow(pl, &link_state);
 663                         mac_config = link_state.link;
 664                         break;
 665
 666                 case MLO_AN_FIXED:
 667                         phylink_get_fixed_state(pl, &link_state);
 668                         mac_config = link_state.link;
 669                         break;
 670
 671                 case MLO_AN_INBAND:
 672                         phylink_mac_pcs_get_state(pl, &link_state);
 673
 674                         /* If we have a phy, the "up" state is the union of
 675                          * both the PHY and the MAC */
 676                         if (pl->phydev)
 677                                 link_state.link &= pl->phy_state.link;
 678
 679                         /* Only update if the PHY link is up */
 680                         if (pl->phydev && pl->phy_state.link) {
 681                                 link_state.interface = pl->phy_state.interface;
 682
 683                                 /* If we have a PHY, we need to update with
 684                                  * the PHY flow control bits. */
 685                                 link_state.pause = pl->phy_state.pause;
 686                                 mac_config = true;
 687                         }
 688                         phylink_apply_manual_flow(pl, &link_state);
 689                         break;
 690                 }
 691         }
 692
 693         if (mac_config) {
 694                 if (link_state.interface != pl->link_config.interface) {
 695                         /* The interface has changed, force the link down and
 696                          * then reconfigure.
 697                          */
 698                         if (cur_link_state) {
 699                                 phylink_link_down(pl);
 700                                 cur_link_state = false;
 701                         }
 702                         phylink_major_config(pl, false, &link_state);
 703                         pl->link_config.interface = link_state.interface;
 704                 } else if (!pl->pcs_ops) {
 705                         /* The interface remains unchanged, only the speed,
 706                          * duplex or pause settings have changed. Call the
 707                          * old mac_config() method to configure the MAC/PCS
 708                          * only if we do not have a PCS installed (an
 709                          * unconverted user.)
 710                          */
 711                         phylink_mac_config(pl, &link_state);
 712                 }
 713         }
 714
 715         if (link_state.link != cur_link_state) {
 716                 pl->old_link_state = link_state.link;
 717                 if (!link_state.link)
 718                         phylink_link_down(pl);
 719                 else
 720                         phylink_link_up(pl, link_state);
 721         }
 722         if (!link_state.link && pl->mac_link_dropped) {
 723                 pl->mac_link_dropped = false;
 724                 queue_work(system_power_efficient_wq, &pl->resolve);
 725         }
 726         mutex_unlock(&pl->state_mutex);
 727 }
 728
 729 static void phylink_run_resolve(struct phylink *pl)
 730 {
 731         if (!pl->phylink_disable_state)
 732                 queue_work(system_power_efficient_wq, &pl->resolve);
 733 }
 734
 735 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 736 {
 737         unsigned long state = pl->phylink_disable_state;
 738
 739         set_bit(bit, &pl->phylink_disable_state);
 740         if (state == 0) {
 741                 queue_work(system_power_efficient_wq, &pl->resolve);
 742                 flush_work(&pl->resolve);
 743         }
 744 }
 745
 746 static void phylink_fixed_poll(struct timer_list *t)
 747 {
 748         struct phylink *pl = container_of(t, struct phylink, link_poll);
 749
 750         mod_timer(t, jiffies + HZ);
 751
 752         phylink_run_resolve(pl);
 753 }
 754
 755 static const struct sfp_upstream_ops sfp_phylink_ops;
 756
 757 static int phylink_register_sfp(struct phylink *pl,
 758                                 struct fwnode_handle *fwnode)
 759 {
 760         struct sfp_bus *bus;
 761         int ret;
 762
 763         if (!fwnode)
 764                 return 0;
 765
 766         bus = sfp_bus_find_fwnode(fwnode);
 767         if (IS_ERR(bus)) {
 768                 ret = PTR_ERR(bus);
 769                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 770                 return ret;
 771         }
 772
 773         pl->sfp_bus = bus;
 774
 775         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 776         sfp_bus_put(bus);
 777
 778         return ret;
 779 }
 780
 781 /**
 782  * phylink_create() - create a phylink instance
 783  * @config: a pointer to the target &struct phylink_config
 784  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 785  *      interface
 786  * @iface: the desired link mode defined by &typedef phy_interface_t
 787  * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
 788  *
 789  * Create a new phylink instance, and parse the link parameters found in @np.
 790  * This will parse in-band modes, fixed-link or SFP configuration.
 791  *
 792  * Note: the rtnl lock must not be held when calling this function.
 793  *
 794  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 795  * must use IS_ERR() to check for errors from this function.
 796  */
 797 struct phylink *phylink_create(struct phylink_config *config,
 798                                struct fwnode_handle *fwnode,
 799                                phy_interface_t iface,
 800                                const struct phylink_mac_ops *mac_ops)
 801 {
 802         struct phylink *pl;
 803         int ret;
 804
 805         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 806         if (!pl)
 807                 return ERR_PTR(-ENOMEM);
 808
 809         mutex_init(&pl->state_mutex);
 810         INIT_WORK(&pl->resolve, phylink_resolve);
 811
 812         pl->config = config;
 813         if (config->type == PHYLINK_NETDEV) {
 814                 pl->netdev = to_net_dev(config->dev);
 815         } else if (config->type == PHYLINK_DEV) {
 816                 pl->dev = config->dev;
 817         } else {
 818                 kfree(pl);
 819                 return ERR_PTR(-EINVAL);
 820         }
 821
 822         pl->phy_state.interface = iface;
 823         pl->link_interface = iface;
 824         if (iface == PHY_INTERFACE_MODE_MOCA)
 825                 pl->link_port = PORT_BNC;
 826         else
 827                 pl->link_port = PORT_MII;
 828         pl->link_config.interface = iface;
 829         pl->link_config.pause = MLO_PAUSE_AN;
 830         pl->link_config.speed = SPEED_UNKNOWN;
 831         pl->link_config.duplex = DUPLEX_UNKNOWN;
 832         pl->link_config.an_enabled = true;
 833         pl->mac_ops = mac_ops;
 834         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 835         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 836
 837         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 838         linkmode_copy(pl->link_config.advertising, pl->supported);
 839         phylink_validate(pl, pl->supported, &pl->link_config);
 840
 841         ret = phylink_parse_mode(pl, fwnode);
 842         if (ret < 0) {
 843                 kfree(pl);
 844                 return ERR_PTR(ret);
 845         }
 846
 847         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 848                 ret = phylink_parse_fixedlink(pl, fwnode);
 849                 if (ret < 0) {
 850                         kfree(pl);
 851                         return ERR_PTR(ret);
 852                 }
 853         }
 854
 855         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 856
 857         ret = phylink_register_sfp(pl, fwnode);
 858         if (ret < 0) {
 859                 kfree(pl);
 860                 return ERR_PTR(ret);
 861         }
 862
 863         return pl;
 864 }
 865 EXPORT_SYMBOL_GPL(phylink_create);
 866
 867 /**
 868  * phylink_set_pcs() - set the current PCS for phylink to use
 869  * @pl: a pointer to a &struct phylink returned from phylink_create()
 870  * @pcs: a pointer to the &struct phylink_pcs
 871  *
 872  * Bind the MAC PCS to phylink.  This may be called after phylink_create(),
 873  * in mac_prepare() or mac_config() methods if it is desired to dynamically
 874  * change the PCS.
 875  *
 876  * Please note that there are behavioural changes with the mac_config()
 877  * callback if a PCS is present (denoting a newer setup) so removing a PCS
 878  * is not supported, and if a PCS is going to be used, it must be registered
 879  * by calling phylink_set_pcs() at the latest in the first mac_config() call.
 880  */
 881 void phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs)
 882 {
 883         pl->pcs = pcs;
 884         pl->pcs_ops = pcs->ops;
 885 }
 886 EXPORT_SYMBOL_GPL(phylink_set_pcs);
 887
 888 /**
 889  * phylink_destroy() - cleanup and destroy the phylink instance
 890  * @pl: a pointer to a &struct phylink returned from phylink_create()
 891  *
 892  * Destroy a phylink instance. Any PHY that has been attached must have been
 893  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 894  *
 895  * Note: the rtnl lock must not be held when calling this function.
 896  */
 897 void phylink_destroy(struct phylink *pl)
 898 {
 899         sfp_bus_del_upstream(pl->sfp_bus);
 900         if (pl->link_gpio)
 901                 gpiod_put(pl->link_gpio);
 902
 903         cancel_work_sync(&pl->resolve);
 904         kfree(pl);
 905 }
 906 EXPORT_SYMBOL_GPL(phylink_destroy);
 907
 908 static void phylink_phy_change(struct phy_device *phydev, bool up)
 909 {
 910         struct phylink *pl = phydev->phylink;
 911         bool tx_pause, rx_pause;
 912
 913         phy_get_pause(phydev, &tx_pause, &rx_pause);
 914
 915         mutex_lock(&pl->state_mutex);
 916         pl->phy_state.speed = phydev->speed;
 917         pl->phy_state.duplex = phydev->duplex;
 918         pl->phy_state.pause = MLO_PAUSE_NONE;
 919         if (tx_pause)
 920                 pl->phy_state.pause |= MLO_PAUSE_TX;
 921         if (rx_pause)
 922                 pl->phy_state.pause |= MLO_PAUSE_RX;
 923         pl->phy_state.interface = phydev->interface;
 924         pl->phy_state.link = up;
 925         mutex_unlock(&pl->state_mutex);
 926
 927         phylink_run_resolve(pl);
 928
 929         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 930                     phy_modes(phydev->interface),
 931                     phy_speed_to_str(phydev->speed),
 932                     phy_duplex_to_str(phydev->duplex));
 933 }
 934
 935 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 936                                phy_interface_t interface)
 937 {
 938         struct phylink_link_state config;
 939         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 940         char *irq_str;
 941         int ret;
 942
 943         /*
 944          * This is the new way of dealing with flow control for PHYs,
 945          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 946          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 947          * using our validate call to the MAC, we rely upon the MAC
 948          * clearing the bits from both supported and advertising fields.
 949          */
 950         phy_support_asym_pause(phy);
 951
 952         memset(&config, 0, sizeof(config));
 953         linkmode_copy(supported, phy->supported);
 954         linkmode_copy(config.advertising, phy->advertising);
 955
 956         /* Clause 45 PHYs switch their Serdes lane between several different
 957          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 958          * speeds. We really need to know which interface modes the PHY and
 959          * MAC supports to properly work out which linkmodes can be supported.
 960          */
 961         if (phy->is_c45 &&
 962             interface != PHY_INTERFACE_MODE_RXAUI &&
 963             interface != PHY_INTERFACE_MODE_XAUI &&
 964             interface != PHY_INTERFACE_MODE_USXGMII)
 965                 config.interface = PHY_INTERFACE_MODE_NA;
 966         else
 967                 config.interface = interface;
 968
 969         ret = phylink_validate(pl, supported, &config);
 970         if (ret) {
 971                 phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
 972                              phy_modes(config.interface),
 973                              __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
 974                              __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
 975                              ret);
 976                 return ret;
 977         }
 978
 979         phy->phylink = pl;
 980         phy->phy_link_change = phylink_phy_change;
 981
 982         irq_str = phy_attached_info_irq(phy);
 983         phylink_info(pl,
 984                      "PHY [%s] driver [%s] (irq=%s)\n",
 985                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
 986         kfree(irq_str);
 987
 988         mutex_lock(&phy->lock);
 989         mutex_lock(&pl->state_mutex);
 990         pl->phydev = phy;
 991         pl->phy_state.interface = interface;
 992         pl->phy_state.pause = MLO_PAUSE_NONE;
 993         pl->phy_state.speed = SPEED_UNKNOWN;
 994         pl->phy_state.duplex = DUPLEX_UNKNOWN;
 995         linkmode_copy(pl->supported, supported);
 996         linkmode_copy(pl->link_config.advertising, config.advertising);
 997
 998         /* Restrict the phy advertisement according to the MAC support. */
 999         linkmode_copy(phy->advertising, config.advertising);
1000         mutex_unlock(&pl->state_mutex);
1001         mutex_unlock(&phy->lock);
1002
1003         phylink_dbg(pl,
1004                     "phy: setting supported %*pb advertising %*pb\n",
1005                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
1006                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
1007
1008         if (phy_interrupt_is_valid(phy))
1009                 phy_request_interrupt(phy);
1010
1011         return 0;
1012 }
1013
1014 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
1015                               phy_interface_t interface)
1016 {
1017         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
1018                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1019                      phy_interface_mode_is_8023z(interface))))
1020                 return -EINVAL;
1021
1022         if (pl->phydev)
1023                 return -EBUSY;
1024
1025         return phy_attach_direct(pl->netdev, phy, 0, interface);
1026 }
1027
1028 /**
1029  * phylink_connect_phy() - connect a PHY to the phylink instance
1030  * @pl: a pointer to a &struct phylink returned from phylink_create()
1031  * @phy: a pointer to a &struct phy_device.
1032  *
1033  * Connect @phy to the phylink instance specified by @pl by calling
1034  * phy_attach_direct(). Configure the @phy according to the MAC driver's
1035  * capabilities, start the PHYLIB state machine and enable any interrupts
1036  * that the PHY supports.
1037  *
1038  * This updates the phylink's ethtool supported and advertising link mode
1039  * masks.
1040  *
1041  * Returns 0 on success or a negative errno.
1042  */
1043 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
1044 {
1045         int ret;
1046
1047         /* Use PHY device/driver interface */
1048         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1049                 pl->link_interface = phy->interface;
1050                 pl->link_config.interface = pl->link_interface;
1051         }
1052
1053         ret = phylink_attach_phy(pl, phy, pl->link_interface);
1054         if (ret < 0)
1055                 return ret;
1056
1057         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
1058         if (ret)
1059                 phy_detach(phy);
1060
1061         return ret;
1062 }
1063 EXPORT_SYMBOL_GPL(phylink_connect_phy);
1064
1065 /**
1066  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
1067  * @pl: a pointer to a &struct phylink returned from phylink_create()
1068  * @dn: a pointer to a &struct device_node.
1069  * @flags: PHY-specific flags to communicate to the PHY device driver
1070  *
1071  * Connect the phy specified in the device node @dn to the phylink instance
1072  * specified by @pl. Actions specified in phylink_connect_phy() will be
1073  * performed.
1074  *
1075  * Returns 0 on success or a negative errno.
1076  */
1077 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
1078                            u32 flags)
1079 {
1080         struct device_node *phy_node;
1081         struct phy_device *phy_dev;
1082         int ret;
1083
1084         /* Fixed links and 802.3z are handled without needing a PHY */
1085         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
1086             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1087              phy_interface_mode_is_8023z(pl->link_interface)))
1088                 return 0;
1089
1090         phy_node = of_parse_phandle(dn, "phy-handle", 0);
1091         if (!phy_node)
1092                 phy_node = of_parse_phandle(dn, "phy", 0);
1093         if (!phy_node)
1094                 phy_node = of_parse_phandle(dn, "phy-device", 0);
1095
1096         if (!phy_node) {
1097                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
1098                         return -ENODEV;
1099                 return 0;
1100         }
1101
1102         phy_dev = of_phy_find_device(phy_node);
1103         /* We're done with the phy_node handle */
1104         of_node_put(phy_node);
1105         if (!phy_dev)
1106                 return -ENODEV;
1107
1108         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
1109                                 pl->link_interface);
1110         if (ret)
1111                 return ret;
1112
1113         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
1114         if (ret)
1115                 phy_detach(phy_dev);
1116
1117         return ret;
1118 }
1119 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
1120
1121 /**
1122  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
1123  *   instance.
1124  * @pl: a pointer to a &struct phylink returned from phylink_create()
1125  *
1126  * Disconnect any current PHY from the phylink instance described by @pl.
1127  */
1128 void phylink_disconnect_phy(struct phylink *pl)
1129 {
1130         struct phy_device *phy;
1131
1132         ASSERT_RTNL();
1133
1134         phy = pl->phydev;
1135         if (phy) {
1136                 mutex_lock(&phy->lock);
1137                 mutex_lock(&pl->state_mutex);
1138                 pl->phydev = NULL;
1139                 mutex_unlock(&pl->state_mutex);
1140                 mutex_unlock(&phy->lock);
1141                 flush_work(&pl->resolve);
1142
1143                 phy_disconnect(phy);
1144         }
1145 }
1146 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
1147
1148 /**
1149  * phylink_mac_change() - notify phylink of a change in MAC state
1150  * @pl: a pointer to a &struct phylink returned from phylink_create()
1151  * @up: indicates whether the link is currently up.
1152  *
1153  * The MAC driver should call this driver when the state of its link
1154  * changes (eg, link failure, new negotiation results, etc.)
1155  */
1156 void phylink_mac_change(struct phylink *pl, bool up)
1157 {
1158         if (!up)
1159                 pl->mac_link_dropped = true;
1160         phylink_run_resolve(pl);
1161         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
1162 }
1163 EXPORT_SYMBOL_GPL(phylink_mac_change);
1164
1165 static irqreturn_t phylink_link_handler(int irq, void *data)
1166 {
1167         struct phylink *pl = data;
1168
1169         phylink_run_resolve(pl);
1170
1171         return IRQ_HANDLED;
1172 }
1173
1174 /**
1175  * phylink_start() - start a phylink instance
1176  * @pl: a pointer to a &struct phylink returned from phylink_create()
1177  *
1178  * Start the phylink instance specified by @pl, configuring the MAC for the
1179  * desired link mode(s) and negotiation style. This should be called from the
1180  * network device driver's &struct net_device_ops ndo_open() method.
1181  */
1182 void phylink_start(struct phylink *pl)
1183 {
1184         bool poll = false;
1185
1186         ASSERT_RTNL();
1187
1188         phylink_info(pl, "configuring for %s/%s link mode\n",
1189                      phylink_an_mode_str(pl->cur_link_an_mode),
1190                      phy_modes(pl->link_config.interface));
1191
1192         /* Always set the carrier off */
1193         if (pl->netdev)
1194                 netif_carrier_off(pl->netdev);
1195
1196         /* Apply the link configuration to the MAC when starting. This allows
1197          * a fixed-link to start with the correct parameters, and also
1198          * ensures that we set the appropriate advertisement for Serdes links.
1199          *
1200          * Restart autonegotiation if using 802.3z to ensure that the link
1201          * parameters are properly negotiated.  This is necessary for DSA
1202          * switches using 802.3z negotiation to ensure they see our modes.
1203          */
1204         phylink_mac_initial_config(pl, true);
1205
1206         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1207         phylink_run_resolve(pl);
1208
1209         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1210                 int irq = gpiod_to_irq(pl->link_gpio);
1211
1212                 if (irq > 0) {
1213                         if (!request_irq(irq, phylink_link_handler,
1214                                          IRQF_TRIGGER_RISING |
1215                                          IRQF_TRIGGER_FALLING,
1216                                          "netdev link", pl))
1217                                 pl->link_irq = irq;
1218                         else
1219                                 irq = 0;
1220                 }
1221                 if (irq <= 0)
1222                         poll = true;
1223         }
1224
1225         switch (pl->cfg_link_an_mode) {
1226         case MLO_AN_FIXED:
1227                 poll |= pl->config->poll_fixed_state;
1228                 break;
1229         case MLO_AN_INBAND:
1230                 poll |= pl->config->pcs_poll;
1231                 if (pl->pcs)
1232                         poll |= pl->pcs->poll;
1233                 break;
1234         }
1235         if (poll)
1236                 mod_timer(&pl->link_poll, jiffies + HZ);
1237         if (pl->phydev)
1238                 phy_start(pl->phydev);
1239         if (pl->sfp_bus)
1240                 sfp_upstream_start(pl->sfp_bus);
1241 }
1242 EXPORT_SYMBOL_GPL(phylink_start);
1243
1244 /**
1245  * phylink_stop() - stop a phylink instance
1246  * @pl: a pointer to a &struct phylink returned from phylink_create()
1247  *
1248  * Stop the phylink instance specified by @pl. This should be called from the
1249  * network device driver's &struct net_device_ops ndo_stop() method.  The
1250  * network device's carrier state should not be changed prior to calling this
1251  * function.
1252  */
1253 void phylink_stop(struct phylink *pl)
1254 {
1255         ASSERT_RTNL();
1256
1257         if (pl->sfp_bus)
1258                 sfp_upstream_stop(pl->sfp_bus);
1259         if (pl->phydev)
1260                 phy_stop(pl->phydev);
1261         del_timer_sync(&pl->link_poll);
1262         if (pl->link_irq) {
1263                 free_irq(pl->link_irq, pl);
1264                 pl->link_irq = 0;
1265         }
1266
1267         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1268 }
1269 EXPORT_SYMBOL_GPL(phylink_stop);
1270
1271 /**
1272  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1273  * @pl: a pointer to a &struct phylink returned from phylink_create()
1274  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1275  *
1276  * Read the wake on lan parameters from the PHY attached to the phylink
1277  * instance specified by @pl. If no PHY is currently attached, report no
1278  * support for wake on lan.
1279  */
1280 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1281 {
1282         ASSERT_RTNL();
1283
1284         wol->supported = 0;
1285         wol->wolopts = 0;
1286
1287         if (pl->phydev)
1288                 phy_ethtool_get_wol(pl->phydev, wol);
1289 }
1290 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1291
1292 /**
1293  * phylink_ethtool_set_wol() - set wake on lan parameters
1294  * @pl: a pointer to a &struct phylink returned from phylink_create()
1295  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1296  *
1297  * Set the wake on lan parameters for the PHY attached to the phylink
1298  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1299  * error.
1300  *
1301  * Returns zero on success or negative errno code.
1302  */
1303 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1304 {
1305         int ret = -EOPNOTSUPP;
1306
1307         ASSERT_RTNL();
1308
1309         if (pl->phydev)
1310                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1311
1312         return ret;
1313 }
1314 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1315
1316 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1317 {
1318         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1319
1320         linkmode_zero(mask);
1321         phylink_set_port_modes(mask);
1322
1323         linkmode_and(dst, dst, mask);
1324         linkmode_or(dst, dst, b);
1325 }
1326
1327 static void phylink_get_ksettings(const struct phylink_link_state *state,
1328                                   struct ethtool_link_ksettings *kset)
1329 {
1330         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1331         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1332         kset->base.speed = state->speed;
1333         kset->base.duplex = state->duplex;
1334         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1335                                 AUTONEG_DISABLE;
1336 }
1337
1338 /**
1339  * phylink_ethtool_ksettings_get() - get the current link settings
1340  * @pl: a pointer to a &struct phylink returned from phylink_create()
1341  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1342  *
1343  * Read the current link settings for the phylink instance specified by @pl.
1344  * This will be the link settings read from the MAC, PHY or fixed link
1345  * settings depending on the current negotiation mode.
1346  */
1347 int phylink_ethtool_ksettings_get(struct phylink *pl,
1348                                   struct ethtool_link_ksettings *kset)
1349 {
1350         struct phylink_link_state link_state;
1351
1352         ASSERT_RTNL();
1353
1354         if (pl->phydev) {
1355                 phy_ethtool_ksettings_get(pl->phydev, kset);
1356         } else {
1357                 kset->base.port = pl->link_port;
1358         }
1359
1360         linkmode_copy(kset->link_modes.supported, pl->supported);
1361
1362         switch (pl->cur_link_an_mode) {
1363         case MLO_AN_FIXED:
1364                 /* We are using fixed settings. Report these as the
1365                  * current link settings - and note that these also
1366                  * represent the supported speeds/duplex/pause modes.
1367                  */
1368                 phylink_get_fixed_state(pl, &link_state);
1369                 phylink_get_ksettings(&link_state, kset);
1370                 break;
1371
1372         case MLO_AN_INBAND:
1373                 /* If there is a phy attached, then use the reported
1374                  * settings from the phy with no modification.
1375                  */
1376                 if (pl->phydev)
1377                         break;
1378
1379                 phylink_mac_pcs_get_state(pl, &link_state);
1380
1381                 /* The MAC is reporting the link results from its own PCS
1382                  * layer via in-band status. Report these as the current
1383                  * link settings.
1384                  */
1385                 phylink_get_ksettings(&link_state, kset);
1386                 break;
1387         }
1388
1389         return 0;
1390 }
1391 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1392
1393 /**
1394  * phylink_ethtool_ksettings_set() - set the link settings
1395  * @pl: a pointer to a &struct phylink returned from phylink_create()
1396  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1397  */
1398 int phylink_ethtool_ksettings_set(struct phylink *pl,
1399                                   const struct ethtool_link_ksettings *kset)
1400 {
1401         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1402         struct phylink_link_state config;
1403         const struct phy_setting *s;
1404
1405         ASSERT_RTNL();
1406
1407         if (pl->phydev) {
1408                 /* We can rely on phylib for this update; we also do not need
1409                  * to update the pl->link_config settings:
1410                  * - the configuration returned via ksettings_get() will come
1411                  *   from phylib whenever a PHY is present.
1412                  * - link_config.interface will be updated by the PHY calling
1413                  *   back via phylink_phy_change() and a subsequent resolve.
1414                  * - initial link configuration for PHY mode comes from the
1415                  *   last phy state updated via phylink_phy_change().
1416                  * - other configuration changes (e.g. pause modes) are
1417                  *   performed directly via phylib.
1418                  * - if in in-band mode with a PHY, the link configuration
1419                  *   is passed on the link from the PHY, and all of
1420                  *   link_config.{speed,duplex,an_enabled,pause} are not used.
1421                  * - the only possible use would be link_config.advertising
1422                  *   pause modes when in 1000base-X mode with a PHY, but in
1423                  *   the presence of a PHY, this should not be changed as that
1424                  *   should be determined from the media side advertisement.
1425                  */
1426                 return phy_ethtool_ksettings_set(pl->phydev, kset);
1427         }
1428
1429         linkmode_copy(support, pl->supported);
1430         config = pl->link_config;
1431         config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
1432
1433         /* Mask out unsupported advertisements, and force the autoneg bit */
1434         linkmode_and(config.advertising, kset->link_modes.advertising,
1435                      support);
1436         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
1437                          config.an_enabled);
1438
1439         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1440         switch (kset->base.autoneg) {
1441         case AUTONEG_DISABLE:
1442                 /* Autonegotiation disabled, select a suitable speed and
1443                  * duplex.
1444                  */
1445                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1446                                        support, false);
1447                 if (!s)
1448                         return -EINVAL;
1449
1450                 /* If we have a fixed link, refuse to change link parameters.
1451                  * If the link parameters match, accept them but do nothing.
1452                  */
1453                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1454                         if (s->speed != pl->link_config.speed ||
1455                             s->duplex != pl->link_config.duplex)
1456                                 return -EINVAL;
1457                         return 0;
1458                 }
1459
1460                 config.speed = s->speed;
1461                 config.duplex = s->duplex;
1462                 break;
1463
1464         case AUTONEG_ENABLE:
1465                 /* If we have a fixed link, allow autonegotiation (since that
1466                  * is our default case) but do not allow the advertisement to
1467                  * be changed. If the advertisement matches, simply return.
1468                  */
1469                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1470                         if (!linkmode_equal(config.advertising,
1471                                             pl->link_config.advertising))
1472                                 return -EINVAL;
1473                         return 0;
1474                 }
1475
1476                 config.speed = SPEED_UNKNOWN;
1477                 config.duplex = DUPLEX_UNKNOWN;
1478                 break;
1479
1480         default:
1481                 return -EINVAL;
1482         }
1483
1484         /* We have ruled out the case with a PHY attached, and the
1485          * fixed-link cases.  All that is left are in-band links.
1486          */
1487         if (phylink_validate(pl, support, &config))
1488                 return -EINVAL;
1489
1490         /* If autonegotiation is enabled, we must have an advertisement */
1491         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
1492                 return -EINVAL;
1493
1494         mutex_lock(&pl->state_mutex);
1495         pl->link_config.speed = config.speed;
1496         pl->link_config.duplex = config.duplex;
1497         pl->link_config.an_enabled = config.an_enabled;
1498
1499         if (pl->link_config.interface != config.interface) {
1500                 /* The interface changed, e.g. 1000base-X <-> 2500base-X */
1501                 /* We need to force the link down, then change the interface */
1502                 if (pl->old_link_state) {
1503                         phylink_link_down(pl);
1504                         pl->old_link_state = false;
1505                 }
1506                 if (!test_bit(PHYLINK_DISABLE_STOPPED,
1507                               &pl->phylink_disable_state))
1508                         phylink_major_config(pl, false, &config);
1509                 pl->link_config.interface = config.interface;
1510                 linkmode_copy(pl->link_config.advertising, config.advertising);
1511         } else if (!linkmode_equal(pl->link_config.advertising,
1512                                    config.advertising)) {
1513                 linkmode_copy(pl->link_config.advertising, config.advertising);
1514                 phylink_change_inband_advert(pl);
1515         }
1516         mutex_unlock(&pl->state_mutex);
1517
1518         return 0;
1519 }
1520 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1521
1522 /**
1523  * phylink_ethtool_nway_reset() - restart negotiation
1524  * @pl: a pointer to a &struct phylink returned from phylink_create()
1525  *
1526  * Restart negotiation for the phylink instance specified by @pl. This will
1527  * cause any attached phy to restart negotiation with the link partner, and
1528  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1529  * negotiation.
1530  *
1531  * Returns zero on success, or negative error code.
1532  */
1533 int phylink_ethtool_nway_reset(struct phylink *pl)
1534 {
1535         int ret = 0;
1536
1537         ASSERT_RTNL();
1538
1539         if (pl->phydev)
1540                 ret = phy_restart_aneg(pl->phydev);
1541         phylink_mac_pcs_an_restart(pl);
1542
1543         return ret;
1544 }
1545 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1546
1547 /**
1548  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1549  * @pl: a pointer to a &struct phylink returned from phylink_create()
1550  * @pause: a pointer to a &struct ethtool_pauseparam
1551  */
1552 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1553                                     struct ethtool_pauseparam *pause)
1554 {
1555         ASSERT_RTNL();
1556
1557         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1558         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1559         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1560 }
1561 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1562
1563 /**
1564  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1565  * @pl: a pointer to a &struct phylink returned from phylink_create()
1566  * @pause: a pointer to a &struct ethtool_pauseparam
1567  */
1568 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1569                                    struct ethtool_pauseparam *pause)
1570 {
1571         struct phylink_link_state *config = &pl->link_config;
1572         bool manual_changed;
1573         int pause_state;
1574
1575         ASSERT_RTNL();
1576
1577         if (pl->cur_link_an_mode == MLO_AN_FIXED)
1578                 return -EOPNOTSUPP;
1579
1580         if (!phylink_test(pl->supported, Pause) &&
1581             !phylink_test(pl->supported, Asym_Pause))
1582                 return -EOPNOTSUPP;
1583
1584         if (!phylink_test(pl->supported, Asym_Pause) &&
1585             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1586                 return -EINVAL;
1587
1588         pause_state = 0;
1589         if (pause->autoneg)
1590                 pause_state |= MLO_PAUSE_AN;
1591         if (pause->rx_pause)
1592                 pause_state |= MLO_PAUSE_RX;
1593         if (pause->tx_pause)
1594                 pause_state |= MLO_PAUSE_TX;
1595
1596         mutex_lock(&pl->state_mutex);
1597         /*
1598          * See the comments for linkmode_set_pause(), wrt the deficiencies
1599          * with the current implementation.  A solution to this issue would
1600          * be:
1601          * ethtool  Local device
1602          *  rx  tx  Pause AsymDir
1603          *  0   0   0     0
1604          *  1   0   1     1
1605          *  0   1   0     1
1606          *  1   1   1     1
1607          * and then use the ethtool rx/tx enablement status to mask the
1608          * rx/tx pause resolution.
1609          */
1610         linkmode_set_pause(config->advertising, pause->tx_pause,
1611                            pause->rx_pause);
1612
1613         manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
1614                          (!(pause_state & MLO_PAUSE_AN) &&
1615                            (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);
1616
1617         config->pause = pause_state;
1618
1619         /* Update our in-band advertisement, triggering a renegotiation if
1620          * the advertisement changed.
1621          */
1622         if (!pl->phydev)
1623                 phylink_change_inband_advert(pl);
1624
1625         mutex_unlock(&pl->state_mutex);
1626
1627         /* If we have a PHY, a change of the pause frame advertisement will
1628          * cause phylib to renegotiate (if AN is enabled) which will in turn
1629          * call our phylink_phy_change() and trigger a resolve.  Note that
1630          * we can't hold our state mutex while calling phy_set_asym_pause().
1631          */
1632         if (pl->phydev)
1633                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1634                                    pause->tx_pause);
1635
1636         /* If the manual pause settings changed, make sure we trigger a
1637          * resolve to update their state; we can not guarantee that the
1638          * link will cycle.
1639          */
1640         if (manual_changed) {
1641                 pl->mac_link_dropped = true;
1642                 phylink_run_resolve(pl);
1643         }
1644
1645         return 0;
1646 }
1647 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1648
1649 /**
1650  * phylink_ethtool_get_eee_err() - read the energy efficient ethernet error
1651  *   counter
1652  * @pl: a pointer to a &struct phylink returned from phylink_create().
1653  *
1654  * Read the Energy Efficient Ethernet error counter from the PHY associated
1655  * with the phylink instance specified by @pl.
1656  *
1657  * Returns positive error counter value, or negative error code.
1658  */
1659 int phylink_get_eee_err(struct phylink *pl)
1660 {
1661         int ret = 0;
1662
1663         ASSERT_RTNL();
1664
1665         if (pl->phydev)
1666                 ret = phy_get_eee_err(pl->phydev);
1667
1668         return ret;
1669 }
1670 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1671
1672 /**
1673  * phylink_init_eee() - init and check the EEE features
1674  * @pl: a pointer to a &struct phylink returned from phylink_create()
1675  * @clk_stop_enable: allow PHY to stop receive clock
1676  *
1677  * Must be called either with RTNL held or within mac_link_up()
1678  */
1679 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1680 {
1681         int ret = -EOPNOTSUPP;
1682
1683         if (pl->phydev)
1684                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1685
1686         return ret;
1687 }
1688 EXPORT_SYMBOL_GPL(phylink_init_eee);
1689
1690 /**
1691  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1692  * @pl: a pointer to a &struct phylink returned from phylink_create()
1693  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1694  */
1695 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1696 {
1697         int ret = -EOPNOTSUPP;
1698
1699         ASSERT_RTNL();
1700
1701         if (pl->phydev)
1702                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1703
1704         return ret;
1705 }
1706 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1707
1708 /**
1709  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1710  * @pl: a pointer to a &struct phylink returned from phylink_create()
1711  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1712  */
1713 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1714 {
1715         int ret = -EOPNOTSUPP;
1716
1717         ASSERT_RTNL();
1718
1719         if (pl->phydev)
1720                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1721
1722         return ret;
1723 }
1724 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1725
1726 /* This emulates MII registers for a fixed-mode phy operating as per the
1727  * passed in state. "aneg" defines if we report negotiation is possible.
1728  *
1729  * FIXME: should deal with negotiation state too.
1730  */
1731 static int phylink_mii_emul_read(unsigned int reg,
1732                                  struct phylink_link_state *state)
1733 {
1734         struct fixed_phy_status fs;
1735         unsigned long *lpa = state->lp_advertising;
1736         int val;
1737
1738         fs.link = state->link;
1739         fs.speed = state->speed;
1740         fs.duplex = state->duplex;
1741         fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
1742         fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
1743
1744         val = swphy_read_reg(reg, &fs);
1745         if (reg == MII_BMSR) {
1746                 if (!state->an_complete)
1747                         val &= ~BMSR_ANEGCOMPLETE;
1748         }
1749         return val;
1750 }
1751
1752 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1753                             unsigned int reg)
1754 {
1755         struct phy_device *phydev = pl->phydev;
1756         int prtad, devad;
1757
1758         if (mdio_phy_id_is_c45(phy_id)) {
1759                 prtad = mdio_phy_id_prtad(phy_id);
1760                 devad = mdio_phy_id_devad(phy_id);
1761                 devad = mdiobus_c45_addr(devad, reg);
1762         } else if (phydev->is_c45) {
1763                 switch (reg) {
1764                 case MII_BMCR:
1765                 case MII_BMSR:
1766                 case MII_PHYSID1:
1767                 case MII_PHYSID2:
1768                         devad = __ffs(phydev->c45_ids.mmds_present);
1769                         break;
1770                 case MII_ADVERTISE:
1771                 case MII_LPA:
1772                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1773                                 return -EINVAL;
1774                         devad = MDIO_MMD_AN;
1775                         if (reg == MII_ADVERTISE)
1776                                 reg = MDIO_AN_ADVERTISE;
1777                         else
1778                                 reg = MDIO_AN_LPA;
1779                         break;
1780                 default:
1781                         return -EINVAL;
1782                 }
1783                 prtad = phy_id;
1784                 devad = mdiobus_c45_addr(devad, reg);
1785         } else {
1786                 prtad = phy_id;
1787                 devad = reg;
1788         }
1789         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1790 }
1791
1792 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1793                              unsigned int reg, unsigned int val)
1794 {
1795         struct phy_device *phydev = pl->phydev;
1796         int prtad, devad;
1797
1798         if (mdio_phy_id_is_c45(phy_id)) {
1799                 prtad = mdio_phy_id_prtad(phy_id);
1800                 devad = mdio_phy_id_devad(phy_id);
1801                 devad = mdiobus_c45_addr(devad, reg);
1802         } else if (phydev->is_c45) {
1803                 switch (reg) {
1804                 case MII_BMCR:
1805                 case MII_BMSR:
1806                 case MII_PHYSID1:
1807                 case MII_PHYSID2:
1808                         devad = __ffs(phydev->c45_ids.mmds_present);
1809                         break;
1810                 case MII_ADVERTISE:
1811                 case MII_LPA:
1812                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1813                                 return -EINVAL;
1814                         devad = MDIO_MMD_AN;
1815                         if (reg == MII_ADVERTISE)
1816                                 reg = MDIO_AN_ADVERTISE;
1817                         else
1818                                 reg = MDIO_AN_LPA;
1819                         break;
1820                 default:
1821                         return -EINVAL;
1822                 }
1823                 prtad = phy_id;
1824                 devad = mdiobus_c45_addr(devad, reg);
1825         } else {
1826                 prtad = phy_id;
1827                 devad = reg;
1828         }
1829
1830         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1831 }
1832
1833 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1834                             unsigned int reg)
1835 {
1836         struct phylink_link_state state;
1837         int val = 0xffff;
1838
1839         switch (pl->cur_link_an_mode) {
1840         case MLO_AN_FIXED:
1841                 if (phy_id == 0) {
1842                         phylink_get_fixed_state(pl, &state);
1843                         val = phylink_mii_emul_read(reg, &state);
1844                 }
1845                 break;
1846
1847         case MLO_AN_PHY:
1848                 return -EOPNOTSUPP;
1849
1850         case MLO_AN_INBAND:
1851                 if (phy_id == 0) {
1852                         phylink_mac_pcs_get_state(pl, &state);
1853                         val = phylink_mii_emul_read(reg, &state);
1854                 }
1855                 break;
1856         }
1857
1858         return val & 0xffff;
1859 }
1860
1861 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1862                              unsigned int reg, unsigned int val)
1863 {
1864         switch (pl->cur_link_an_mode) {
1865         case MLO_AN_FIXED:
1866                 break;
1867
1868         case MLO_AN_PHY:
1869                 return -EOPNOTSUPP;
1870
1871         case MLO_AN_INBAND:
1872                 break;
1873         }
1874
1875         return 0;
1876 }
1877
1878 /**
1879  * phylink_mii_ioctl() - generic mii ioctl interface
1880  * @pl: a pointer to a &struct phylink returned from phylink_create()
1881  * @ifr: a pointer to a &struct ifreq for socket ioctls
1882  * @cmd: ioctl cmd to execute
1883  *
1884  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1885  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1886  *
1887  * Returns: zero on success or negative error code.
1888  *
1889  * %SIOCGMIIPHY:
1890  *  read register from the current PHY.
1891  * %SIOCGMIIREG:
1892  *  read register from the specified PHY.
1893  * %SIOCSMIIREG:
1894  *  set a register on the specified PHY.
1895  */
1896 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1897 {
1898         struct mii_ioctl_data *mii = if_mii(ifr);
1899         int  ret;
1900
1901         ASSERT_RTNL();
1902
1903         if (pl->phydev) {
1904                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1905                 switch (cmd) {
1906                 case SIOCGMIIPHY:
1907                         mii->phy_id = pl->phydev->mdio.addr;
1908                         /* fall through */
1909
1910                 case SIOCGMIIREG:
1911                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1912                         if (ret >= 0) {
1913                                 mii->val_out = ret;
1914                                 ret = 0;
1915                         }
1916                         break;
1917
1918                 case SIOCSMIIREG:
1919                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1920                                                 mii->val_in);
1921                         break;
1922
1923                 default:
1924                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1925                         break;
1926                 }
1927         } else {
1928                 switch (cmd) {
1929                 case SIOCGMIIPHY:
1930                         mii->phy_id = 0;
1931                         /* fall through */
1932
1933                 case SIOCGMIIREG:
1934                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1935                         if (ret >= 0) {
1936                                 mii->val_out = ret;
1937                                 ret = 0;
1938                         }
1939                         break;
1940
1941                 case SIOCSMIIREG:
1942                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1943                                                 mii->val_in);
1944                         break;
1945
1946                 default:
1947                         ret = -EOPNOTSUPP;
1948                         break;
1949                 }
1950         }
1951
1952         return ret;
1953 }
1954 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1955
1956 /**
1957  * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
1958  *   link partners
1959  * @pl: a pointer to a &struct phylink returned from phylink_create()
1960  * @sync: perform action synchronously
1961  *
1962  * If we have a PHY that is not part of a SFP module, then set the speed
1963  * as described in the phy_speed_down() function. Please see this function
1964  * for a description of the @sync parameter.
1965  *
1966  * Returns zero if there is no PHY, otherwise as per phy_speed_down().
1967  */
1968 int phylink_speed_down(struct phylink *pl, bool sync)
1969 {
1970         int ret = 0;
1971
1972         ASSERT_RTNL();
1973
1974         if (!pl->sfp_bus && pl->phydev)
1975                 ret = phy_speed_down(pl->phydev, sync);
1976
1977         return ret;
1978 }
1979 EXPORT_SYMBOL_GPL(phylink_speed_down);
1980
1981 /**
1982  * phylink_speed_up() - restore the advertised speeds prior to the call to
1983  *   phylink_speed_down()
1984  * @pl: a pointer to a &struct phylink returned from phylink_create()
1985  *
1986  * If we have a PHY that is not part of a SFP module, then restore the
1987  * PHY speeds as per phy_speed_up().
1988  *
1989  * Returns zero if there is no PHY, otherwise as per phy_speed_up().
1990  */
1991 int phylink_speed_up(struct phylink *pl)
1992 {
1993         int ret = 0;
1994
1995         ASSERT_RTNL();
1996
1997         if (!pl->sfp_bus && pl->phydev)
1998                 ret = phy_speed_up(pl->phydev);
1999
2000         return ret;
2001 }
2002 EXPORT_SYMBOL_GPL(phylink_speed_up);
2003
2004 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
2005 {
2006         struct phylink *pl = upstream;
2007
2008         pl->netdev->sfp_bus = bus;
2009 }
2010
2011 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
2012 {
2013         struct phylink *pl = upstream;
2014
2015         pl->netdev->sfp_bus = NULL;
2016 }
2017
2018 static int phylink_sfp_config(struct phylink *pl, u8 mode,
2019                               const unsigned long *supported,
2020                               const unsigned long *advertising)
2021 {
2022         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
2023         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
2024         struct phylink_link_state config;
2025         phy_interface_t iface;
2026         bool changed;
2027         int ret;
2028
2029         linkmode_copy(support, supported);
2030
2031         memset(&config, 0, sizeof(config));
2032         linkmode_copy(config.advertising, advertising);
2033         config.interface = PHY_INTERFACE_MODE_NA;
2034         config.speed = SPEED_UNKNOWN;
2035         config.duplex = DUPLEX_UNKNOWN;
2036         config.pause = MLO_PAUSE_AN;
2037         config.an_enabled = pl->link_config.an_enabled;
2038
2039         /* Ignore errors if we're expecting a PHY to attach later */
2040         ret = phylink_validate(pl, support, &config);
2041         if (ret) {
2042                 phylink_err(pl, "validation with support %*pb failed: %d\n",
2043                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2044                 return ret;
2045         }
2046
2047         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
2048         if (iface == PHY_INTERFACE_MODE_NA) {
2049                 phylink_err(pl,
2050                             "selection of interface failed, advertisement %*pb\n",
2051                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
2052                 return -EINVAL;
2053         }
2054
2055         config.interface = iface;
2056         linkmode_copy(support1, support);
2057         ret = phylink_validate(pl, support1, &config);
2058         if (ret) {
2059                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
2060                             phylink_an_mode_str(mode),
2061                             phy_modes(config.interface),
2062                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2063                 return ret;
2064         }
2065
2066         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
2067                     phylink_an_mode_str(mode), phy_modes(config.interface),
2068                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2069
2070         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
2071                 return -EINVAL;
2072
2073         changed = !linkmode_equal(pl->supported, support);
2074         if (changed) {
2075                 linkmode_copy(pl->supported, support);
2076                 linkmode_copy(pl->link_config.advertising, config.advertising);
2077         }
2078
2079         if (pl->cur_link_an_mode != mode ||
2080             pl->link_config.interface != config.interface) {
2081                 pl->link_config.interface = config.interface;
2082                 pl->cur_link_an_mode = mode;
2083
2084                 changed = true;
2085
2086                 phylink_info(pl, "switched to %s/%s link mode\n",
2087                              phylink_an_mode_str(mode),
2088                              phy_modes(config.interface));
2089         }
2090
2091         pl->link_port = pl->sfp_port;
2092
2093         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
2094                                  &pl->phylink_disable_state))
2095                 phylink_mac_initial_config(pl, false);
2096
2097         return ret;
2098 }
2099
2100 static int phylink_sfp_module_insert(void *upstream,
2101                                      const struct sfp_eeprom_id *id)
2102 {
2103         struct phylink *pl = upstream;
2104         unsigned long *support = pl->sfp_support;
2105
2106         ASSERT_RTNL();
2107
2108         linkmode_zero(support);
2109         sfp_parse_support(pl->sfp_bus, id, support);
2110         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
2111
2112         /* If this module may have a PHY connecting later, defer until later */
2113         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
2114         if (pl->sfp_may_have_phy)
2115                 return 0;
2116
2117         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
2118 }
2119
2120 static int phylink_sfp_module_start(void *upstream)
2121 {
2122         struct phylink *pl = upstream;
2123
2124         /* If this SFP module has a PHY, start the PHY now. */
2125         if (pl->phydev) {
2126                 phy_start(pl->phydev);
2127                 return 0;
2128         }
2129
2130         /* If the module may have a PHY but we didn't detect one we
2131          * need to configure the MAC here.
2132          */
2133         if (!pl->sfp_may_have_phy)
2134                 return 0;
2135
2136         return phylink_sfp_config(pl, MLO_AN_INBAND,
2137                                   pl->sfp_support, pl->sfp_support);
2138 }
2139
2140 static void phylink_sfp_module_stop(void *upstream)
2141 {
2142         struct phylink *pl = upstream;
2143
2144         /* If this SFP module has a PHY, stop it. */
2145         if (pl->phydev)
2146                 phy_stop(pl->phydev);
2147 }
2148
2149 static void phylink_sfp_link_down(void *upstream)
2150 {
2151         struct phylink *pl = upstream;
2152
2153         ASSERT_RTNL();
2154
2155         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
2156 }
2157
2158 static void phylink_sfp_link_up(void *upstream)
2159 {
2160         struct phylink *pl = upstream;
2161
2162         ASSERT_RTNL();
2163
2164         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
2165         phylink_run_resolve(pl);
2166 }
2167
2168 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
2169  * or 802.3z control word, so inband will not work.
2170  */
2171 static bool phylink_phy_no_inband(struct phy_device *phy)
2172 {
2173         return phy->is_c45 &&
2174                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
2175 }
2176
2177 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
2178 {
2179         struct phylink *pl = upstream;
2180         phy_interface_t interface;
2181         u8 mode;
2182         int ret;
2183
2184         /*
2185          * This is the new way of dealing with flow control for PHYs,
2186          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
2187          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
2188          * using our validate call to the MAC, we rely upon the MAC
2189          * clearing the bits from both supported and advertising fields.
2190          */
2191         phy_support_asym_pause(phy);
2192
2193         if (phylink_phy_no_inband(phy))
2194                 mode = MLO_AN_PHY;
2195         else
2196                 mode = MLO_AN_INBAND;
2197
2198         /* Do the initial configuration */
2199         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
2200         if (ret < 0)
2201                 return ret;
2202
2203         interface = pl->link_config.interface;
2204         ret = phylink_attach_phy(pl, phy, interface);
2205         if (ret < 0)
2206                 return ret;
2207
2208         ret = phylink_bringup_phy(pl, phy, interface);
2209         if (ret)
2210                 phy_detach(phy);
2211
2212         return ret;
2213 }
2214
2215 static void phylink_sfp_disconnect_phy(void *upstream)
2216 {
2217         phylink_disconnect_phy(upstream);
2218 }
2219
2220 static const struct sfp_upstream_ops sfp_phylink_ops = {
2221         .attach = phylink_sfp_attach,
2222         .detach = phylink_sfp_detach,
2223         .module_insert = phylink_sfp_module_insert,
2224         .module_start = phylink_sfp_module_start,
2225         .module_stop = phylink_sfp_module_stop,
2226         .link_up = phylink_sfp_link_up,
2227         .link_down = phylink_sfp_link_down,
2228         .connect_phy = phylink_sfp_connect_phy,
2229         .disconnect_phy = phylink_sfp_disconnect_phy,
2230 };
2231
2232 /* Helpers for MAC drivers */
2233
2234 /**
2235  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
2236  * @state: a pointer to a &struct phylink_link_state
2237  *
2238  * Inspect the interface mode, advertising mask or forced speed and
2239  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
2240  * the interface mode to suit.  @state->interface is appropriately
2241  * updated, and the advertising mask has the "other" baseX_Full flag
2242  * cleared.
2243  */
2244 void phylink_helper_basex_speed(struct phylink_link_state *state)
2245 {
2246         if (phy_interface_mode_is_8023z(state->interface)) {
2247                 bool want_2500 = state->an_enabled ?
2248                         phylink_test(state->advertising, 2500baseX_Full) :
2249                         state->speed == SPEED_2500;
2250
2251                 if (want_2500) {
2252                         phylink_clear(state->advertising, 1000baseX_Full);
2253                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
2254                 } else {
2255                         phylink_clear(state->advertising, 2500baseX_Full);
2256                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
2257                 }
2258         }
2259 }
2260 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
2261
2262 static void phylink_decode_c37_word(struct phylink_link_state *state,
2263                                     uint16_t config_reg, int speed)
2264 {
2265         bool tx_pause, rx_pause;
2266         int fd_bit;
2267
2268         if (speed == SPEED_2500)
2269                 fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
2270         else
2271                 fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
2272
2273         mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
2274
2275         if (linkmode_test_bit(fd_bit, state->advertising) &&
2276             linkmode_test_bit(fd_bit, state->lp_advertising)) {
2277                 state->speed = speed;
2278                 state->duplex = DUPLEX_FULL;
2279         } else {
2280                 /* negotiation failure */
2281                 state->link = false;
2282         }
2283
2284         linkmode_resolve_pause(state->advertising, state->lp_advertising,
2285                                &tx_pause, &rx_pause);
2286
2287         if (tx_pause)
2288                 state->pause |= MLO_PAUSE_TX;
2289         if (rx_pause)
2290                 state->pause |= MLO_PAUSE_RX;
2291 }
2292
2293 static void phylink_decode_sgmii_word(struct phylink_link_state *state,
2294                                       uint16_t config_reg)
2295 {
2296         if (!(config_reg & LPA_SGMII_LINK)) {
2297                 state->link = false;
2298                 return;
2299         }
2300
2301         switch (config_reg & LPA_SGMII_SPD_MASK) {
2302         case LPA_SGMII_10:
2303                 state->speed = SPEED_10;
2304                 break;
2305         case LPA_SGMII_100:
2306                 state->speed = SPEED_100;
2307                 break;
2308         case LPA_SGMII_1000:
2309                 state->speed = SPEED_1000;
2310                 break;
2311         default:
2312                 state->link = false;
2313                 return;
2314         }
2315         if (config_reg & LPA_SGMII_FULL_DUPLEX)
2316                 state->duplex = DUPLEX_FULL;
2317         else
2318                 state->duplex = DUPLEX_HALF;
2319 }
2320
2321 /**
2322  * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
2323  * @pcs: a pointer to a &struct mdio_device.
2324  * @state: a pointer to a &struct phylink_link_state.
2325  *
2326  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2327  * clause 37 negotiation and/or SGMII control.
2328  *
2329  * Read the MAC PCS state from the MII device configured in @config and
2330  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
2331  * the phylink @state structure. This is suitable to be directly plugged
2332  * into the mac_pcs_get_state() member of the struct phylink_mac_ops
2333  * structure.
2334  */
2335 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
2336                                    struct phylink_link_state *state)
2337 {
2338         struct mii_bus *bus = pcs->bus;
2339         int addr = pcs->addr;
2340         int bmsr, lpa;
2341
2342         bmsr = mdiobus_read(bus, addr, MII_BMSR);
2343         lpa = mdiobus_read(bus, addr, MII_LPA);
2344         if (bmsr < 0 || lpa < 0) {
2345                 state->link = false;
2346                 return;
2347         }
2348
2349         state->link = !!(bmsr & BMSR_LSTATUS);
2350         state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
2351         if (!state->link)
2352                 return;
2353
2354         switch (state->interface) {
2355         case PHY_INTERFACE_MODE_1000BASEX:
2356                 phylink_decode_c37_word(state, lpa, SPEED_1000);
2357                 break;
2358
2359         case PHY_INTERFACE_MODE_2500BASEX:
2360                 phylink_decode_c37_word(state, lpa, SPEED_2500);
2361                 break;
2362
2363         case PHY_INTERFACE_MODE_SGMII:
2364                 phylink_decode_sgmii_word(state, lpa);
2365                 break;
2366
2367         default:
2368                 state->link = false;
2369                 break;
2370         }
2371 }
2372 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
2373
2374 /**
2375  * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
2376  *      advertisement
2377  * @pcs: a pointer to a &struct mdio_device.
2378  * @interface: the PHY interface mode being configured
2379  * @advertising: the ethtool advertisement mask
2380  *
2381  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2382  * clause 37 negotiation and/or SGMII control.
2383  *
2384  * Configure the clause 37 PCS advertisement as specified by @state. This
2385  * does not trigger a renegotiation; phylink will do that via the
2386  * mac_an_restart() method of the struct phylink_mac_ops structure.
2387  *
2388  * Returns negative error code on failure to configure the advertisement,
2389  * zero if no change has been made, or one if the advertisement has changed.
2390  */
2391 int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
2392                                           phy_interface_t interface,
2393                                           const unsigned long *advertising)
2394 {
2395         struct mii_bus *bus = pcs->bus;
2396         int addr = pcs->addr;
2397         int val, ret;
2398         u16 adv;
2399
2400         switch (interface) {
2401         case PHY_INTERFACE_MODE_1000BASEX:
2402         case PHY_INTERFACE_MODE_2500BASEX:
2403                 adv = ADVERTISE_1000XFULL;
2404                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
2405                                       advertising))
2406                         adv |= ADVERTISE_1000XPAUSE;
2407                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
2408                                       advertising))
2409                         adv |= ADVERTISE_1000XPSE_ASYM;
2410
2411                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2412                 if (val < 0)
2413                         return val;
2414
2415                 if (val == adv)
2416                         return 0;
2417
2418                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
2419                 if (ret < 0)
2420                         return ret;
2421
2422                 return 1;
2423
2424         case PHY_INTERFACE_MODE_SGMII:
2425                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2426                 if (val < 0)
2427                         return val;
2428
2429                 if (val == 0x0001)
2430                         return 0;
2431
2432                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
2433                 if (ret < 0)
2434                         return ret;
2435
2436                 return 1;
2437
2438         default:
2439                 /* Nothing to do for other modes */
2440                 return 0;
2441         }
2442 }
2443 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);
2444
2445 /**
2446  * phylink_mii_c22_pcs_config() - configure clause 22 PCS
2447  * @pcs: a pointer to a &struct mdio_device.
2448  * @mode: link autonegotiation mode
2449  * @interface: the PHY interface mode being configured
2450  * @advertising: the ethtool advertisement mask
2451  *
2452  * Configure a Clause 22 PCS PHY with the appropriate negotiation
2453  * parameters for the @mode, @interface and @advertising parameters.
2454  * Returns negative error number on failure, zero if the advertisement
2455  * has not changed, or positive if there is a change.
2456  */
2457 int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
2458                                phy_interface_t interface,
2459                                const unsigned long *advertising)
2460 {
2461         bool changed;
2462         u16 bmcr;
2463         int ret;
2464
2465         ret = phylink_mii_c22_pcs_set_advertisement(pcs, interface,
2466                                                     advertising);
2467         if (ret < 0)
2468                 return ret;
2469
2470         changed = ret > 0;
2471
2472         bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
2473         ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
2474                              BMCR_ANENABLE, bmcr);
2475         if (ret < 0)
2476                 return ret;
2477
2478         return changed ? 1 : 0;
2479 }
2480 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
2481
2482 /**
2483  * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
2484  * @pcs: a pointer to a &struct mdio_device.
2485  *
2486  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2487  * clause 37 negotiation.
2488  *
2489  * Restart the clause 37 negotiation with the link partner. This is
2490  * suitable to be directly plugged into the mac_pcs_get_state() member
2491  * of the struct phylink_mac_ops structure.
2492  */
2493 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
2494 {
2495         struct mii_bus *bus = pcs->bus;
2496         int val, addr = pcs->addr;
2497
2498         val = mdiobus_read(bus, addr, MII_BMCR);
2499         if (val >= 0) {
2500                 val |= BMCR_ANRESTART;
2501
2502                 mdiobus_write(bus, addr, MII_BMCR, val);
2503         }
2504 }
2505 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
2506
2507 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
2508                                    struct phylink_link_state *state)
2509 {
2510         struct mii_bus *bus = pcs->bus;
2511         int addr = pcs->addr;
2512         int stat;
2513
2514         stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
2515         if (stat < 0) {
2516                 state->link = false;
2517                 return;
2518         }
2519
2520         state->link = !!(stat & MDIO_STAT1_LSTATUS);
2521         if (!state->link)
2522                 return;
2523
2524         switch (state->interface) {
2525         case PHY_INTERFACE_MODE_10GBASER:
2526                 state->speed = SPEED_10000;
2527                 state->duplex = DUPLEX_FULL;
2528                 break;
2529
2530         default:
2531                 break;
2532         }
2533 }
2534 EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);
2535
2536 MODULE_LICENSE("GPL v2");