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             pl->config->ovr_an_inband) {
 277                 if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 278                         phylink_err(pl,
 279                                     "can't use both fixed-link and in-band-status\n");
 280                         return -EINVAL;
 281                 }
 282
 283                 linkmode_zero(pl->supported);
 284                 phylink_set(pl->supported, MII);
 285                 phylink_set(pl->supported, Autoneg);
 286                 phylink_set(pl->supported, Asym_Pause);
 287                 phylink_set(pl->supported, Pause);
 288                 pl->link_config.an_enabled = true;
 289                 pl->cfg_link_an_mode = MLO_AN_INBAND;
 290
 291                 switch (pl->link_config.interface) {
 292                 case PHY_INTERFACE_MODE_SGMII:
 293                 case PHY_INTERFACE_MODE_QSGMII:
 294                         phylink_set(pl->supported, 10baseT_Half);
 295                         phylink_set(pl->supported, 10baseT_Full);
 296                         phylink_set(pl->supported, 100baseT_Half);
 297                         phylink_set(pl->supported, 100baseT_Full);
 298                         phylink_set(pl->supported, 1000baseT_Half);
 299                         phylink_set(pl->supported, 1000baseT_Full);
 300                         break;
 301
 302                 case PHY_INTERFACE_MODE_1000BASEX:
 303                         phylink_set(pl->supported, 1000baseX_Full);
 304                         break;
 305
 306                 case PHY_INTERFACE_MODE_2500BASEX:
 307                         phylink_set(pl->supported, 2500baseX_Full);
 308                         break;
 309
 310                 case PHY_INTERFACE_MODE_5GBASER:
 311                         phylink_set(pl->supported, 5000baseT_Full);
 312                         break;
 313
 314                 case PHY_INTERFACE_MODE_USXGMII:
 315                 case PHY_INTERFACE_MODE_10GKR:
 316                 case PHY_INTERFACE_MODE_10GBASER:
 317                         phylink_set(pl->supported, 10baseT_Half);
 318                         phylink_set(pl->supported, 10baseT_Full);
 319                         phylink_set(pl->supported, 100baseT_Half);
 320                         phylink_set(pl->supported, 100baseT_Full);
 321                         phylink_set(pl->supported, 1000baseT_Half);
 322                         phylink_set(pl->supported, 1000baseT_Full);
 323                         phylink_set(pl->supported, 1000baseX_Full);
 324                         phylink_set(pl->supported, 1000baseKX_Full);
 325                         phylink_set(pl->supported, 2500baseT_Full);
 326                         phylink_set(pl->supported, 2500baseX_Full);
 327                         phylink_set(pl->supported, 5000baseT_Full);
 328                         phylink_set(pl->supported, 10000baseT_Full);
 329                         phylink_set(pl->supported, 10000baseKR_Full);
 330                         phylink_set(pl->supported, 10000baseKX4_Full);
 331                         phylink_set(pl->supported, 10000baseCR_Full);
 332                         phylink_set(pl->supported, 10000baseSR_Full);
 333                         phylink_set(pl->supported, 10000baseLR_Full);
 334                         phylink_set(pl->supported, 10000baseLRM_Full);
 335                         phylink_set(pl->supported, 10000baseER_Full);
 336                         break;
 337
 338                 case PHY_INTERFACE_MODE_XLGMII:
 339                         phylink_set(pl->supported, 25000baseCR_Full);
 340                         phylink_set(pl->supported, 25000baseKR_Full);
 341                         phylink_set(pl->supported, 25000baseSR_Full);
 342                         phylink_set(pl->supported, 40000baseKR4_Full);
 343                         phylink_set(pl->supported, 40000baseCR4_Full);
 344                         phylink_set(pl->supported, 40000baseSR4_Full);
 345                         phylink_set(pl->supported, 40000baseLR4_Full);
 346                         phylink_set(pl->supported, 50000baseCR2_Full);
 347                         phylink_set(pl->supported, 50000baseKR2_Full);
 348                         phylink_set(pl->supported, 50000baseSR2_Full);
 349                         phylink_set(pl->supported, 50000baseKR_Full);
 350                         phylink_set(pl->supported, 50000baseSR_Full);
 351                         phylink_set(pl->supported, 50000baseCR_Full);
 352                         phylink_set(pl->supported, 50000baseLR_ER_FR_Full);
 353                         phylink_set(pl->supported, 50000baseDR_Full);
 354                         phylink_set(pl->supported, 100000baseKR4_Full);
 355                         phylink_set(pl->supported, 100000baseSR4_Full);
 356                         phylink_set(pl->supported, 100000baseCR4_Full);
 357                         phylink_set(pl->supported, 100000baseLR4_ER4_Full);
 358                         phylink_set(pl->supported, 100000baseKR2_Full);
 359                         phylink_set(pl->supported, 100000baseSR2_Full);
 360                         phylink_set(pl->supported, 100000baseCR2_Full);
 361                         phylink_set(pl->supported, 100000baseLR2_ER2_FR2_Full);
 362                         phylink_set(pl->supported, 100000baseDR2_Full);
 363                         break;
 364
 365                 default:
 366                         phylink_err(pl,
 367                                     "incorrect link mode %s for in-band status\n",
 368                                     phy_modes(pl->link_config.interface));
 369                         return -EINVAL;
 370                 }
 371
 372                 linkmode_copy(pl->link_config.advertising, pl->supported);
 373
 374                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 375                         phylink_err(pl,
 376                                     "failed to validate link configuration for in-band status\n");
 377                         return -EINVAL;
 378                 }
 379
 380                 /* Check if MAC/PCS also supports Autoneg. */
 381                 pl->link_config.an_enabled = phylink_test(pl->supported, Autoneg);
 382         }
 383
 384         return 0;
 385 }
 386
 387 static void phylink_apply_manual_flow(struct phylink *pl,
 388                                       struct phylink_link_state *state)
 389 {
 390         /* If autoneg is disabled, pause AN is also disabled */
 391         if (!state->an_enabled)
 392                 state->pause &= ~MLO_PAUSE_AN;
 393
 394         /* Manual configuration of pause modes */
 395         if (!(pl->link_config.pause & MLO_PAUSE_AN))
 396                 state->pause = pl->link_config.pause;
 397 }
 398
 399 static void phylink_resolve_flow(struct phylink_link_state *state)
 400 {
 401         bool tx_pause, rx_pause;
 402
 403         state->pause = MLO_PAUSE_NONE;
 404         if (state->duplex == DUPLEX_FULL) {
 405                 linkmode_resolve_pause(state->advertising,
 406                                        state->lp_advertising,
 407                                        &tx_pause, &rx_pause);
 408                 if (tx_pause)
 409                         state->pause |= MLO_PAUSE_TX;
 410                 if (rx_pause)
 411                         state->pause |= MLO_PAUSE_RX;
 412         }
 413 }
 414
 415 static void phylink_mac_config(struct phylink *pl,
 416                                const struct phylink_link_state *state)
 417 {
 418         phylink_dbg(pl,
 419                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 420                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 421                     phy_modes(state->interface),
 422                     phy_speed_to_str(state->speed),
 423                     phy_duplex_to_str(state->duplex),
 424                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 425                     state->pause, state->link, state->an_enabled);
 426
 427         pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 428 }
 429
 430 static void phylink_mac_pcs_an_restart(struct phylink *pl)
 431 {
 432         if (pl->link_config.an_enabled &&
 433             phy_interface_mode_is_8023z(pl->link_config.interface) &&
 434             phylink_autoneg_inband(pl->cur_link_an_mode)) {
 435                 if (pl->pcs_ops)
 436                         pl->pcs_ops->pcs_an_restart(pl->pcs);
 437                 else
 438                         pl->mac_ops->mac_an_restart(pl->config);
 439         }
 440 }
 441
 442 static void phylink_major_config(struct phylink *pl, bool restart,
 443                                   const struct phylink_link_state *state)
 444 {
 445         int err;
 446
 447         phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
 448
 449         if (pl->mac_ops->mac_prepare) {
 450                 err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
 451                                                state->interface);
 452                 if (err < 0) {
 453                         phylink_err(pl, "mac_prepare failed: %pe\n",
 454                                     ERR_PTR(err));
 455                         return;
 456                 }
 457         }
 458
 459         phylink_mac_config(pl, state);
 460
 461         if (pl->pcs_ops) {
 462                 err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 463                                               state->interface,
 464                                               state->advertising,
 465                                               !!(pl->link_config.pause &
 466                                                  MLO_PAUSE_AN));
 467                 if (err < 0)
 468                         phylink_err(pl, "pcs_config failed: %pe\n",
 469                                     ERR_PTR(err));
 470                 if (err > 0)
 471                         restart = true;
 472         }
 473         if (restart)
 474                 phylink_mac_pcs_an_restart(pl);
 475
 476         if (pl->mac_ops->mac_finish) {
 477                 err = pl->mac_ops->mac_finish(pl->config, pl->cur_link_an_mode,
 478                                               state->interface);
 479                 if (err < 0)
 480                         phylink_err(pl, "mac_finish failed: %pe\n",
 481                                     ERR_PTR(err));
 482         }
 483 }
 484
 485 /*
 486  * Reconfigure for a change of inband advertisement.
 487  * If we have a separate PCS, we only need to call its pcs_config() method,
 488  * and then restart AN if it indicates something changed. Otherwise, we do
 489  * the full MAC reconfiguration.
 490  */
 491 static int phylink_change_inband_advert(struct phylink *pl)
 492 {
 493         int ret;
 494
 495         if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
 496                 return 0;
 497
 498         if (!pl->pcs_ops) {
 499                 /* Legacy method */
 500                 phylink_mac_config(pl, &pl->link_config);
 501                 phylink_mac_pcs_an_restart(pl);
 502                 return 0;
 503         }
 504
 505         phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
 506                     phylink_an_mode_str(pl->cur_link_an_mode),
 507                     phy_modes(pl->link_config.interface),
 508                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->link_config.advertising,
 509                     pl->link_config.pause);
 510
 511         /* Modern PCS-based method; update the advert at the PCS, and
 512          * restart negotiation if the pcs_config() helper indicates that
 513          * the programmed advertisement has changed.
 514          */
 515         ret = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 516                                       pl->link_config.interface,
 517                                       pl->link_config.advertising,
 518                                       !!(pl->link_config.pause & MLO_PAUSE_AN));
 519         if (ret < 0)
 520                 return ret;
 521
 522         if (ret > 0)
 523                 phylink_mac_pcs_an_restart(pl);
 524
 525         return 0;
 526 }
 527
 528 static void phylink_mac_pcs_get_state(struct phylink *pl,
 529                                       struct phylink_link_state *state)
 530 {
 531         linkmode_copy(state->advertising, pl->link_config.advertising);
 532         linkmode_zero(state->lp_advertising);
 533         state->interface = pl->link_config.interface;
 534         state->an_enabled = pl->link_config.an_enabled;
 535         state->speed = SPEED_UNKNOWN;
 536         state->duplex = DUPLEX_UNKNOWN;
 537         state->pause = MLO_PAUSE_NONE;
 538         state->an_complete = 0;
 539         state->link = 1;
 540
 541         if (pl->pcs_ops)
 542                 pl->pcs_ops->pcs_get_state(pl->pcs, state);
 543         else if (pl->mac_ops->mac_pcs_get_state)
 544                 pl->mac_ops->mac_pcs_get_state(pl->config, state);
 545         else
 546                 state->link = 0;
 547 }
 548
 549 /* The fixed state is... fixed except for the link state,
 550  * which may be determined by a GPIO or a callback.
 551  */
 552 static void phylink_get_fixed_state(struct phylink *pl,
 553                                     struct phylink_link_state *state)
 554 {
 555         *state = pl->link_config;
 556         if (pl->config->get_fixed_state)
 557                 pl->config->get_fixed_state(pl->config, state);
 558         else if (pl->link_gpio)
 559                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 560
 561         phylink_resolve_flow(state);
 562 }
 563
 564 static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
 565 {
 566         struct phylink_link_state link_state;
 567
 568         switch (pl->cur_link_an_mode) {
 569         case MLO_AN_PHY:
 570                 link_state = pl->phy_state;
 571                 break;
 572
 573         case MLO_AN_FIXED:
 574                 phylink_get_fixed_state(pl, &link_state);
 575                 break;
 576
 577         case MLO_AN_INBAND:
 578                 link_state = pl->link_config;
 579                 if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
 580                         link_state.pause = MLO_PAUSE_NONE;
 581                 break;
 582
 583         default: /* can't happen */
 584                 return;
 585         }
 586
 587         link_state.link = false;
 588
 589         phylink_apply_manual_flow(pl, &link_state);
 590         phylink_major_config(pl, force_restart, &link_state);
 591 }
 592
 593 static const char *phylink_pause_to_str(int pause)
 594 {
 595         switch (pause & MLO_PAUSE_TXRX_MASK) {
 596         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 597                 return "rx/tx";
 598         case MLO_PAUSE_TX:
 599                 return "tx";
 600         case MLO_PAUSE_RX:
 601                 return "rx";
 602         default:
 603                 return "off";
 604         }
 605 }
 606
 607 static void phylink_link_up(struct phylink *pl,
 608                             struct phylink_link_state link_state)
 609 {
 610         struct net_device *ndev = pl->netdev;
 611
 612         pl->cur_interface = link_state.interface;
 613
 614         if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
 615                 pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
 616                                          pl->cur_interface,
 617                                          link_state.speed, link_state.duplex);
 618
 619         pl->mac_ops->mac_link_up(pl->config, pl->phydev,
 620                                  pl->cur_link_an_mode, pl->cur_interface,
 621                                  link_state.speed, link_state.duplex,
 622                                  !!(link_state.pause & MLO_PAUSE_TX),
 623                                  !!(link_state.pause & MLO_PAUSE_RX));
 624
 625         if (ndev)
 626                 netif_carrier_on(ndev);
 627
 628         phylink_info(pl,
 629                      "Link is Up - %s/%s - flow control %s\n",
 630                      phy_speed_to_str(link_state.speed),
 631                      phy_duplex_to_str(link_state.duplex),
 632                      phylink_pause_to_str(link_state.pause));
 633 }
 634
 635 static void phylink_link_down(struct phylink *pl)
 636 {
 637         struct net_device *ndev = pl->netdev;
 638
 639         if (ndev)
 640                 netif_carrier_off(ndev);
 641         pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 642                                    pl->cur_interface);
 643         phylink_info(pl, "Link is Down\n");
 644 }
 645
 646 static void phylink_resolve(struct work_struct *w)
 647 {
 648         struct phylink *pl = container_of(w, struct phylink, resolve);
 649         struct phylink_link_state link_state;
 650         struct net_device *ndev = pl->netdev;
 651         bool mac_config = false;
 652         bool cur_link_state;
 653
 654         mutex_lock(&pl->state_mutex);
 655         if (pl->netdev)
 656                 cur_link_state = netif_carrier_ok(ndev);
 657         else
 658                 cur_link_state = pl->old_link_state;
 659
 660         if (pl->phylink_disable_state) {
 661                 pl->mac_link_dropped = false;
 662                 link_state.link = false;
 663         } else if (pl->mac_link_dropped) {
 664                 link_state.link = false;
 665         } else {
 666                 switch (pl->cur_link_an_mode) {
 667                 case MLO_AN_PHY:
 668                         link_state = pl->phy_state;
 669                         phylink_apply_manual_flow(pl, &link_state);
 670                         mac_config = link_state.link;
 671                         break;
 672
 673                 case MLO_AN_FIXED:
 674                         phylink_get_fixed_state(pl, &link_state);
 675                         mac_config = link_state.link;
 676                         break;
 677
 678                 case MLO_AN_INBAND:
 679                         phylink_mac_pcs_get_state(pl, &link_state);
 680
 681                         /* If we have a phy, the "up" state is the union of
 682                          * both the PHY and the MAC */
 683                         if (pl->phydev)
 684                                 link_state.link &= pl->phy_state.link;
 685
 686                         /* Only update if the PHY link is up */
 687                         if (pl->phydev && pl->phy_state.link) {
 688                                 link_state.interface = pl->phy_state.interface;
 689
 690                                 /* If we have a PHY, we need to update with
 691                                  * the PHY flow control bits. */
 692                                 link_state.pause = pl->phy_state.pause;
 693                                 mac_config = true;
 694                         }
 695                         phylink_apply_manual_flow(pl, &link_state);
 696                         break;
 697                 }
 698         }
 699
 700         if (mac_config) {
 701                 if (link_state.interface != pl->link_config.interface) {
 702                         /* The interface has changed, force the link down and
 703                          * then reconfigure.
 704                          */
 705                         if (cur_link_state) {
 706                                 phylink_link_down(pl);
 707                                 cur_link_state = false;
 708                         }
 709                         phylink_major_config(pl, false, &link_state);
 710                         pl->link_config.interface = link_state.interface;
 711                 } else if (!pl->pcs_ops) {
 712                         /* The interface remains unchanged, only the speed,
 713                          * duplex or pause settings have changed. Call the
 714                          * old mac_config() method to configure the MAC/PCS
 715                          * only if we do not have a PCS installed (an
 716                          * unconverted user.)
 717                          */
 718                         phylink_mac_config(pl, &link_state);
 719                 }
 720         }
 721
 722         if (link_state.link != cur_link_state) {
 723                 pl->old_link_state = link_state.link;
 724                 if (!link_state.link)
 725                         phylink_link_down(pl);
 726                 else
 727                         phylink_link_up(pl, link_state);
 728         }
 729         if (!link_state.link && pl->mac_link_dropped) {
 730                 pl->mac_link_dropped = false;
 731                 queue_work(system_power_efficient_wq, &pl->resolve);
 732         }
 733         mutex_unlock(&pl->state_mutex);
 734 }
 735
 736 static void phylink_run_resolve(struct phylink *pl)
 737 {
 738         if (!pl->phylink_disable_state)
 739                 queue_work(system_power_efficient_wq, &pl->resolve);
 740 }
 741
 742 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 743 {
 744         unsigned long state = pl->phylink_disable_state;
 745
 746         set_bit(bit, &pl->phylink_disable_state);
 747         if (state == 0) {
 748                 queue_work(system_power_efficient_wq, &pl->resolve);
 749                 flush_work(&pl->resolve);
 750         }
 751 }
 752
 753 static void phylink_fixed_poll(struct timer_list *t)
 754 {
 755         struct phylink *pl = container_of(t, struct phylink, link_poll);
 756
 757         mod_timer(t, jiffies + HZ);
 758
 759         phylink_run_resolve(pl);
 760 }
 761
 762 static const struct sfp_upstream_ops sfp_phylink_ops;
 763
 764 static int phylink_register_sfp(struct phylink *pl,
 765                                 struct fwnode_handle *fwnode)
 766 {
 767         struct sfp_bus *bus;
 768         int ret;
 769
 770         if (!fwnode)
 771                 return 0;
 772
 773         bus = sfp_bus_find_fwnode(fwnode);
 774         if (IS_ERR(bus)) {
 775                 ret = PTR_ERR(bus);
 776                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 777                 return ret;
 778         }
 779
 780         pl->sfp_bus = bus;
 781
 782         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 783         sfp_bus_put(bus);
 784
 785         return ret;
 786 }
 787
 788 /**
 789  * phylink_create() - create a phylink instance
 790  * @config: a pointer to the target &struct phylink_config
 791  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 792  *      interface
 793  * @iface: the desired link mode defined by &typedef phy_interface_t
 794  * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
 795  *
 796  * Create a new phylink instance, and parse the link parameters found in @np.
 797  * This will parse in-band modes, fixed-link or SFP configuration.
 798  *
 799  * Note: the rtnl lock must not be held when calling this function.
 800  *
 801  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 802  * must use IS_ERR() to check for errors from this function.
 803  */
 804 struct phylink *phylink_create(struct phylink_config *config,
 805                                struct fwnode_handle *fwnode,
 806                                phy_interface_t iface,
 807                                const struct phylink_mac_ops *mac_ops)
 808 {
 809         struct phylink *pl;
 810         int ret;
 811
 812         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 813         if (!pl)
 814                 return ERR_PTR(-ENOMEM);
 815
 816         mutex_init(&pl->state_mutex);
 817         INIT_WORK(&pl->resolve, phylink_resolve);
 818
 819         pl->config = config;
 820         if (config->type == PHYLINK_NETDEV) {
 821                 pl->netdev = to_net_dev(config->dev);
 822         } else if (config->type == PHYLINK_DEV) {
 823                 pl->dev = config->dev;
 824         } else {
 825                 kfree(pl);
 826                 return ERR_PTR(-EINVAL);
 827         }
 828
 829         pl->phy_state.interface = iface;
 830         pl->link_interface = iface;
 831         if (iface == PHY_INTERFACE_MODE_MOCA)
 832                 pl->link_port = PORT_BNC;
 833         else
 834                 pl->link_port = PORT_MII;
 835         pl->link_config.interface = iface;
 836         pl->link_config.pause = MLO_PAUSE_AN;
 837         pl->link_config.speed = SPEED_UNKNOWN;
 838         pl->link_config.duplex = DUPLEX_UNKNOWN;
 839         pl->link_config.an_enabled = true;
 840         pl->mac_ops = mac_ops;
 841         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 842         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 843
 844         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 845         linkmode_copy(pl->link_config.advertising, pl->supported);
 846         phylink_validate(pl, pl->supported, &pl->link_config);
 847
 848         ret = phylink_parse_mode(pl, fwnode);
 849         if (ret < 0) {
 850                 kfree(pl);
 851                 return ERR_PTR(ret);
 852         }
 853
 854         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 855                 ret = phylink_parse_fixedlink(pl, fwnode);
 856                 if (ret < 0) {
 857                         kfree(pl);
 858                         return ERR_PTR(ret);
 859                 }
 860         }
 861
 862         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 863
 864         ret = phylink_register_sfp(pl, fwnode);
 865         if (ret < 0) {
 866                 kfree(pl);
 867                 return ERR_PTR(ret);
 868         }
 869
 870         return pl;
 871 }
 872 EXPORT_SYMBOL_GPL(phylink_create);
 873
 874 /**
 875  * phylink_set_pcs() - set the current PCS for phylink to use
 876  * @pl: a pointer to a &struct phylink returned from phylink_create()
 877  * @pcs: a pointer to the &struct phylink_pcs
 878  *
 879  * Bind the MAC PCS to phylink.  This may be called after phylink_create(),
 880  * in mac_prepare() or mac_config() methods if it is desired to dynamically
 881  * change the PCS.
 882  *
 883  * Please note that there are behavioural changes with the mac_config()
 884  * callback if a PCS is present (denoting a newer setup) so removing a PCS
 885  * is not supported, and if a PCS is going to be used, it must be registered
 886  * by calling phylink_set_pcs() at the latest in the first mac_config() call.
 887  */
 888 void phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs)
 889 {
 890         pl->pcs = pcs;
 891         pl->pcs_ops = pcs->ops;
 892 }
 893 EXPORT_SYMBOL_GPL(phylink_set_pcs);
 894
 895 /**
 896  * phylink_destroy() - cleanup and destroy the phylink instance
 897  * @pl: a pointer to a &struct phylink returned from phylink_create()
 898  *
 899  * Destroy a phylink instance. Any PHY that has been attached must have been
 900  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 901  *
 902  * Note: the rtnl lock must not be held when calling this function.
 903  */
 904 void phylink_destroy(struct phylink *pl)
 905 {
 906         sfp_bus_del_upstream(pl->sfp_bus);
 907         if (pl->link_gpio)
 908                 gpiod_put(pl->link_gpio);
 909
 910         cancel_work_sync(&pl->resolve);
 911         kfree(pl);
 912 }
 913 EXPORT_SYMBOL_GPL(phylink_destroy);
 914
 915 static void phylink_phy_change(struct phy_device *phydev, bool up)
 916 {
 917         struct phylink *pl = phydev->phylink;
 918         bool tx_pause, rx_pause;
 919
 920         phy_get_pause(phydev, &tx_pause, &rx_pause);
 921
 922         mutex_lock(&pl->state_mutex);
 923         pl->phy_state.speed = phydev->speed;
 924         pl->phy_state.duplex = phydev->duplex;
 925         pl->phy_state.pause = MLO_PAUSE_NONE;
 926         if (tx_pause)
 927                 pl->phy_state.pause |= MLO_PAUSE_TX;
 928         if (rx_pause)
 929                 pl->phy_state.pause |= MLO_PAUSE_RX;
 930         pl->phy_state.interface = phydev->interface;
 931         pl->phy_state.link = up;
 932         mutex_unlock(&pl->state_mutex);
 933
 934         phylink_run_resolve(pl);
 935
 936         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 937                     phy_modes(phydev->interface),
 938                     phy_speed_to_str(phydev->speed),
 939                     phy_duplex_to_str(phydev->duplex));
 940 }
 941
 942 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 943                                phy_interface_t interface)
 944 {
 945         struct phylink_link_state config;
 946         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 947         char *irq_str;
 948         int ret;
 949
 950         /*
 951          * This is the new way of dealing with flow control for PHYs,
 952          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 953          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 954          * using our validate call to the MAC, we rely upon the MAC
 955          * clearing the bits from both supported and advertising fields.
 956          */
 957         phy_support_asym_pause(phy);
 958
 959         memset(&config, 0, sizeof(config));
 960         linkmode_copy(supported, phy->supported);
 961         linkmode_copy(config.advertising, phy->advertising);
 962
 963         /* Clause 45 PHYs switch their Serdes lane between several different
 964          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 965          * speeds. We really need to know which interface modes the PHY and
 966          * MAC supports to properly work out which linkmodes can be supported.
 967          */
 968         if (phy->is_c45 &&
 969             interface != PHY_INTERFACE_MODE_RXAUI &&
 970             interface != PHY_INTERFACE_MODE_XAUI &&
 971             interface != PHY_INTERFACE_MODE_USXGMII)
 972                 config.interface = PHY_INTERFACE_MODE_NA;
 973         else
 974                 config.interface = interface;
 975
 976         ret = phylink_validate(pl, supported, &config);
 977         if (ret) {
 978                 phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
 979                              phy_modes(config.interface),
 980                              __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
 981                              __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
 982                              ret);
 983                 return ret;
 984         }
 985
 986         phy->phylink = pl;
 987         phy->phy_link_change = phylink_phy_change;
 988
 989         irq_str = phy_attached_info_irq(phy);
 990         phylink_info(pl,
 991                      "PHY [%s] driver [%s] (irq=%s)\n",
 992                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
 993         kfree(irq_str);
 994
 995         mutex_lock(&phy->lock);
 996         mutex_lock(&pl->state_mutex);
 997         pl->phydev = phy;
 998         pl->phy_state.interface = interface;
 999         pl->phy_state.pause = MLO_PAUSE_NONE;
1000         pl->phy_state.speed = SPEED_UNKNOWN;
1001         pl->phy_state.duplex = DUPLEX_UNKNOWN;
1002         linkmode_copy(pl->supported, supported);
1003         linkmode_copy(pl->link_config.advertising, config.advertising);
1004
1005         /* Restrict the phy advertisement according to the MAC support. */
1006         linkmode_copy(phy->advertising, config.advertising);
1007         mutex_unlock(&pl->state_mutex);
1008         mutex_unlock(&phy->lock);
1009
1010         phylink_dbg(pl,
1011                     "phy: setting supported %*pb advertising %*pb\n",
1012                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
1013                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
1014
1015         if (phy_interrupt_is_valid(phy))
1016                 phy_request_interrupt(phy);
1017
1018         return 0;
1019 }
1020
1021 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
1022                               phy_interface_t interface)
1023 {
1024         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
1025                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1026                      phy_interface_mode_is_8023z(interface))))
1027                 return -EINVAL;
1028
1029         if (pl->phydev)
1030                 return -EBUSY;
1031
1032         return phy_attach_direct(pl->netdev, phy, 0, interface);
1033 }
1034
1035 /**
1036  * phylink_connect_phy() - connect a PHY to the phylink instance
1037  * @pl: a pointer to a &struct phylink returned from phylink_create()
1038  * @phy: a pointer to a &struct phy_device.
1039  *
1040  * Connect @phy to the phylink instance specified by @pl by calling
1041  * phy_attach_direct(). Configure the @phy according to the MAC driver's
1042  * capabilities, start the PHYLIB state machine and enable any interrupts
1043  * that the PHY supports.
1044  *
1045  * This updates the phylink's ethtool supported and advertising link mode
1046  * masks.
1047  *
1048  * Returns 0 on success or a negative errno.
1049  */
1050 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
1051 {
1052         int ret;
1053
1054         /* Use PHY device/driver interface */
1055         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1056                 pl->link_interface = phy->interface;
1057                 pl->link_config.interface = pl->link_interface;
1058         }
1059
1060         ret = phylink_attach_phy(pl, phy, pl->link_interface);
1061         if (ret < 0)
1062                 return ret;
1063
1064         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
1065         if (ret)
1066                 phy_detach(phy);
1067
1068         return ret;
1069 }
1070 EXPORT_SYMBOL_GPL(phylink_connect_phy);
1071
1072 /**
1073  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
1074  * @pl: a pointer to a &struct phylink returned from phylink_create()
1075  * @dn: a pointer to a &struct device_node.
1076  * @flags: PHY-specific flags to communicate to the PHY device driver
1077  *
1078  * Connect the phy specified in the device node @dn to the phylink instance
1079  * specified by @pl. Actions specified in phylink_connect_phy() will be
1080  * performed.
1081  *
1082  * Returns 0 on success or a negative errno.
1083  */
1084 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
1085                            u32 flags)
1086 {
1087         struct device_node *phy_node;
1088         struct phy_device *phy_dev;
1089         int ret;
1090
1091         /* Fixed links and 802.3z are handled without needing a PHY */
1092         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
1093             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1094              phy_interface_mode_is_8023z(pl->link_interface)))
1095                 return 0;
1096
1097         phy_node = of_parse_phandle(dn, "phy-handle", 0);
1098         if (!phy_node)
1099                 phy_node = of_parse_phandle(dn, "phy", 0);
1100         if (!phy_node)
1101                 phy_node = of_parse_phandle(dn, "phy-device", 0);
1102
1103         if (!phy_node) {
1104                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
1105                         return -ENODEV;
1106                 return 0;
1107         }
1108
1109         phy_dev = of_phy_find_device(phy_node);
1110         /* We're done with the phy_node handle */
1111         of_node_put(phy_node);
1112         if (!phy_dev)
1113                 return -ENODEV;
1114
1115         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
1116                                 pl->link_interface);
1117         if (ret)
1118                 return ret;
1119
1120         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
1121         if (ret)
1122                 phy_detach(phy_dev);
1123
1124         return ret;
1125 }
1126 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
1127
1128 /**
1129  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
1130  *   instance.
1131  * @pl: a pointer to a &struct phylink returned from phylink_create()
1132  *
1133  * Disconnect any current PHY from the phylink instance described by @pl.
1134  */
1135 void phylink_disconnect_phy(struct phylink *pl)
1136 {
1137         struct phy_device *phy;
1138
1139         ASSERT_RTNL();
1140
1141         phy = pl->phydev;
1142         if (phy) {
1143                 mutex_lock(&phy->lock);
1144                 mutex_lock(&pl->state_mutex);
1145                 pl->phydev = NULL;
1146                 mutex_unlock(&pl->state_mutex);
1147                 mutex_unlock(&phy->lock);
1148                 flush_work(&pl->resolve);
1149
1150                 phy_disconnect(phy);
1151         }
1152 }
1153 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
1154
1155 /**
1156  * phylink_mac_change() - notify phylink of a change in MAC state
1157  * @pl: a pointer to a &struct phylink returned from phylink_create()
1158  * @up: indicates whether the link is currently up.
1159  *
1160  * The MAC driver should call this driver when the state of its link
1161  * changes (eg, link failure, new negotiation results, etc.)
1162  */
1163 void phylink_mac_change(struct phylink *pl, bool up)
1164 {
1165         if (!up)
1166                 pl->mac_link_dropped = true;
1167         phylink_run_resolve(pl);
1168         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
1169 }
1170 EXPORT_SYMBOL_GPL(phylink_mac_change);
1171
1172 static irqreturn_t phylink_link_handler(int irq, void *data)
1173 {
1174         struct phylink *pl = data;
1175
1176         phylink_run_resolve(pl);
1177
1178         return IRQ_HANDLED;
1179 }
1180
1181 /**
1182  * phylink_start() - start a phylink instance
1183  * @pl: a pointer to a &struct phylink returned from phylink_create()
1184  *
1185  * Start the phylink instance specified by @pl, configuring the MAC for the
1186  * desired link mode(s) and negotiation style. This should be called from the
1187  * network device driver's &struct net_device_ops ndo_open() method.
1188  */
1189 void phylink_start(struct phylink *pl)
1190 {
1191         bool poll = false;
1192
1193         ASSERT_RTNL();
1194
1195         phylink_info(pl, "configuring for %s/%s link mode\n",
1196                      phylink_an_mode_str(pl->cur_link_an_mode),
1197                      phy_modes(pl->link_config.interface));
1198
1199         /* Always set the carrier off */
1200         if (pl->netdev)
1201                 netif_carrier_off(pl->netdev);
1202
1203         /* Apply the link configuration to the MAC when starting. This allows
1204          * a fixed-link to start with the correct parameters, and also
1205          * ensures that we set the appropriate advertisement for Serdes links.
1206          *
1207          * Restart autonegotiation if using 802.3z to ensure that the link
1208          * parameters are properly negotiated.  This is necessary for DSA
1209          * switches using 802.3z negotiation to ensure they see our modes.
1210          */
1211         phylink_mac_initial_config(pl, true);
1212
1213         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1214         phylink_run_resolve(pl);
1215
1216         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1217                 int irq = gpiod_to_irq(pl->link_gpio);
1218
1219                 if (irq > 0) {
1220                         if (!request_irq(irq, phylink_link_handler,
1221                                          IRQF_TRIGGER_RISING |
1222                                          IRQF_TRIGGER_FALLING,
1223                                          "netdev link", pl))
1224                                 pl->link_irq = irq;
1225                         else
1226                                 irq = 0;
1227                 }
1228                 if (irq <= 0)
1229                         poll = true;
1230         }
1231
1232         switch (pl->cfg_link_an_mode) {
1233         case MLO_AN_FIXED:
1234                 poll |= pl->config->poll_fixed_state;
1235                 break;
1236         case MLO_AN_INBAND:
1237                 poll |= pl->config->pcs_poll;
1238                 if (pl->pcs)
1239                         poll |= pl->pcs->poll;
1240                 break;
1241         }
1242         if (poll)
1243                 mod_timer(&pl->link_poll, jiffies + HZ);
1244         if (pl->phydev)
1245                 phy_start(pl->phydev);
1246         if (pl->sfp_bus)
1247                 sfp_upstream_start(pl->sfp_bus);
1248 }
1249 EXPORT_SYMBOL_GPL(phylink_start);
1250
1251 /**
1252  * phylink_stop() - stop a phylink instance
1253  * @pl: a pointer to a &struct phylink returned from phylink_create()
1254  *
1255  * Stop the phylink instance specified by @pl. This should be called from the
1256  * network device driver's &struct net_device_ops ndo_stop() method.  The
1257  * network device's carrier state should not be changed prior to calling this
1258  * function.
1259  */
1260 void phylink_stop(struct phylink *pl)
1261 {
1262         ASSERT_RTNL();
1263
1264         if (pl->sfp_bus)
1265                 sfp_upstream_stop(pl->sfp_bus);
1266         if (pl->phydev)
1267                 phy_stop(pl->phydev);
1268         del_timer_sync(&pl->link_poll);
1269         if (pl->link_irq) {
1270                 free_irq(pl->link_irq, pl);
1271                 pl->link_irq = 0;
1272         }
1273
1274         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1275 }
1276 EXPORT_SYMBOL_GPL(phylink_stop);
1277
1278 /**
1279  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1280  * @pl: a pointer to a &struct phylink returned from phylink_create()
1281  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1282  *
1283  * Read the wake on lan parameters from the PHY attached to the phylink
1284  * instance specified by @pl. If no PHY is currently attached, report no
1285  * support for wake on lan.
1286  */
1287 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1288 {
1289         ASSERT_RTNL();
1290
1291         wol->supported = 0;
1292         wol->wolopts = 0;
1293
1294         if (pl->phydev)
1295                 phy_ethtool_get_wol(pl->phydev, wol);
1296 }
1297 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1298
1299 /**
1300  * phylink_ethtool_set_wol() - set wake on lan parameters
1301  * @pl: a pointer to a &struct phylink returned from phylink_create()
1302  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1303  *
1304  * Set the wake on lan parameters for the PHY attached to the phylink
1305  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1306  * error.
1307  *
1308  * Returns zero on success or negative errno code.
1309  */
1310 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1311 {
1312         int ret = -EOPNOTSUPP;
1313
1314         ASSERT_RTNL();
1315
1316         if (pl->phydev)
1317                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1318
1319         return ret;
1320 }
1321 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1322
1323 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1324 {
1325         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1326
1327         linkmode_zero(mask);
1328         phylink_set_port_modes(mask);
1329
1330         linkmode_and(dst, dst, mask);
1331         linkmode_or(dst, dst, b);
1332 }
1333
1334 static void phylink_get_ksettings(const struct phylink_link_state *state,
1335                                   struct ethtool_link_ksettings *kset)
1336 {
1337         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1338         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1339         kset->base.speed = state->speed;
1340         kset->base.duplex = state->duplex;
1341         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1342                                 AUTONEG_DISABLE;
1343 }
1344
1345 /**
1346  * phylink_ethtool_ksettings_get() - get the current link settings
1347  * @pl: a pointer to a &struct phylink returned from phylink_create()
1348  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1349  *
1350  * Read the current link settings for the phylink instance specified by @pl.
1351  * This will be the link settings read from the MAC, PHY or fixed link
1352  * settings depending on the current negotiation mode.
1353  */
1354 int phylink_ethtool_ksettings_get(struct phylink *pl,
1355                                   struct ethtool_link_ksettings *kset)
1356 {
1357         struct phylink_link_state link_state;
1358
1359         ASSERT_RTNL();
1360
1361         if (pl->phydev) {
1362                 phy_ethtool_ksettings_get(pl->phydev, kset);
1363         } else {
1364                 kset->base.port = pl->link_port;
1365         }
1366
1367         linkmode_copy(kset->link_modes.supported, pl->supported);
1368
1369         switch (pl->cur_link_an_mode) {
1370         case MLO_AN_FIXED:
1371                 /* We are using fixed settings. Report these as the
1372                  * current link settings - and note that these also
1373                  * represent the supported speeds/duplex/pause modes.
1374                  */
1375                 phylink_get_fixed_state(pl, &link_state);
1376                 phylink_get_ksettings(&link_state, kset);
1377                 break;
1378
1379         case MLO_AN_INBAND:
1380                 /* If there is a phy attached, then use the reported
1381                  * settings from the phy with no modification.
1382                  */
1383                 if (pl->phydev)
1384                         break;
1385
1386                 phylink_mac_pcs_get_state(pl, &link_state);
1387
1388                 /* The MAC is reporting the link results from its own PCS
1389                  * layer via in-band status. Report these as the current
1390                  * link settings.
1391                  */
1392                 phylink_get_ksettings(&link_state, kset);
1393                 break;
1394         }
1395
1396         return 0;
1397 }
1398 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1399
1400 /**
1401  * phylink_ethtool_ksettings_set() - set the link settings
1402  * @pl: a pointer to a &struct phylink returned from phylink_create()
1403  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1404  */
1405 int phylink_ethtool_ksettings_set(struct phylink *pl,
1406                                   const struct ethtool_link_ksettings *kset)
1407 {
1408         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1409         struct phylink_link_state config;
1410         const struct phy_setting *s;
1411
1412         ASSERT_RTNL();
1413
1414         if (pl->phydev) {
1415                 /* We can rely on phylib for this update; we also do not need
1416                  * to update the pl->link_config settings:
1417                  * - the configuration returned via ksettings_get() will come
1418                  *   from phylib whenever a PHY is present.
1419                  * - link_config.interface will be updated by the PHY calling
1420                  *   back via phylink_phy_change() and a subsequent resolve.
1421                  * - initial link configuration for PHY mode comes from the
1422                  *   last phy state updated via phylink_phy_change().
1423                  * - other configuration changes (e.g. pause modes) are
1424                  *   performed directly via phylib.
1425                  * - if in in-band mode with a PHY, the link configuration
1426                  *   is passed on the link from the PHY, and all of
1427                  *   link_config.{speed,duplex,an_enabled,pause} are not used.
1428                  * - the only possible use would be link_config.advertising
1429                  *   pause modes when in 1000base-X mode with a PHY, but in
1430                  *   the presence of a PHY, this should not be changed as that
1431                  *   should be determined from the media side advertisement.
1432                  */
1433                 return phy_ethtool_ksettings_set(pl->phydev, kset);
1434         }
1435
1436         linkmode_copy(support, pl->supported);
1437         config = pl->link_config;
1438         config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
1439
1440         /* Mask out unsupported advertisements, and force the autoneg bit */
1441         linkmode_and(config.advertising, kset->link_modes.advertising,
1442                      support);
1443         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
1444                          config.an_enabled);
1445
1446         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1447         switch (kset->base.autoneg) {
1448         case AUTONEG_DISABLE:
1449                 /* Autonegotiation disabled, select a suitable speed and
1450                  * duplex.
1451                  */
1452                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1453                                        support, false);
1454                 if (!s)
1455                         return -EINVAL;
1456
1457                 /* If we have a fixed link, refuse to change link parameters.
1458                  * If the link parameters match, accept them but do nothing.
1459                  */
1460                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1461                         if (s->speed != pl->link_config.speed ||
1462                             s->duplex != pl->link_config.duplex)
1463                                 return -EINVAL;
1464                         return 0;
1465                 }
1466
1467                 config.speed = s->speed;
1468                 config.duplex = s->duplex;
1469                 break;
1470
1471         case AUTONEG_ENABLE:
1472                 /* If we have a fixed link, allow autonegotiation (since that
1473                  * is our default case) but do not allow the advertisement to
1474                  * be changed. If the advertisement matches, simply return.
1475                  */
1476                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1477                         if (!linkmode_equal(config.advertising,
1478                                             pl->link_config.advertising))
1479                                 return -EINVAL;
1480                         return 0;
1481                 }
1482
1483                 config.speed = SPEED_UNKNOWN;
1484                 config.duplex = DUPLEX_UNKNOWN;
1485                 break;
1486
1487         default:
1488                 return -EINVAL;
1489         }
1490
1491         /* We have ruled out the case with a PHY attached, and the
1492          * fixed-link cases.  All that is left are in-band links.
1493          */
1494         if (phylink_validate(pl, support, &config))
1495                 return -EINVAL;
1496
1497         /* If autonegotiation is enabled, we must have an advertisement */
1498         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
1499                 return -EINVAL;
1500
1501         mutex_lock(&pl->state_mutex);
1502         pl->link_config.speed = config.speed;
1503         pl->link_config.duplex = config.duplex;
1504         pl->link_config.an_enabled = config.an_enabled;
1505
1506         if (pl->link_config.interface != config.interface) {
1507                 /* The interface changed, e.g. 1000base-X <-> 2500base-X */
1508                 /* We need to force the link down, then change the interface */
1509                 if (pl->old_link_state) {
1510                         phylink_link_down(pl);
1511                         pl->old_link_state = false;
1512                 }
1513                 if (!test_bit(PHYLINK_DISABLE_STOPPED,
1514                               &pl->phylink_disable_state))
1515                         phylink_major_config(pl, false, &config);
1516                 pl->link_config.interface = config.interface;
1517                 linkmode_copy(pl->link_config.advertising, config.advertising);
1518         } else if (!linkmode_equal(pl->link_config.advertising,
1519                                    config.advertising)) {
1520                 linkmode_copy(pl->link_config.advertising, config.advertising);
1521                 phylink_change_inband_advert(pl);
1522         }
1523         mutex_unlock(&pl->state_mutex);
1524
1525         return 0;
1526 }
1527 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1528
1529 /**
1530  * phylink_ethtool_nway_reset() - restart negotiation
1531  * @pl: a pointer to a &struct phylink returned from phylink_create()
1532  *
1533  * Restart negotiation for the phylink instance specified by @pl. This will
1534  * cause any attached phy to restart negotiation with the link partner, and
1535  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1536  * negotiation.
1537  *
1538  * Returns zero on success, or negative error code.
1539  */
1540 int phylink_ethtool_nway_reset(struct phylink *pl)
1541 {
1542         int ret = 0;
1543
1544         ASSERT_RTNL();
1545
1546         if (pl->phydev)
1547                 ret = phy_restart_aneg(pl->phydev);
1548         phylink_mac_pcs_an_restart(pl);
1549
1550         return ret;
1551 }
1552 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1553
1554 /**
1555  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1556  * @pl: a pointer to a &struct phylink returned from phylink_create()
1557  * @pause: a pointer to a &struct ethtool_pauseparam
1558  */
1559 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1560                                     struct ethtool_pauseparam *pause)
1561 {
1562         ASSERT_RTNL();
1563
1564         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1565         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1566         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1567 }
1568 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1569
1570 /**
1571  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1572  * @pl: a pointer to a &struct phylink returned from phylink_create()
1573  * @pause: a pointer to a &struct ethtool_pauseparam
1574  */
1575 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1576                                    struct ethtool_pauseparam *pause)
1577 {
1578         struct phylink_link_state *config = &pl->link_config;
1579         bool manual_changed;
1580         int pause_state;
1581
1582         ASSERT_RTNL();
1583
1584         if (pl->cur_link_an_mode == MLO_AN_FIXED)
1585                 return -EOPNOTSUPP;
1586
1587         if (!phylink_test(pl->supported, Pause) &&
1588             !phylink_test(pl->supported, Asym_Pause))
1589                 return -EOPNOTSUPP;
1590
1591         if (!phylink_test(pl->supported, Asym_Pause) &&
1592             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1593                 return -EINVAL;
1594
1595         pause_state = 0;
1596         if (pause->autoneg)
1597                 pause_state |= MLO_PAUSE_AN;
1598         if (pause->rx_pause)
1599                 pause_state |= MLO_PAUSE_RX;
1600         if (pause->tx_pause)
1601                 pause_state |= MLO_PAUSE_TX;
1602
1603         mutex_lock(&pl->state_mutex);
1604         /*
1605          * See the comments for linkmode_set_pause(), wrt the deficiencies
1606          * with the current implementation.  A solution to this issue would
1607          * be:
1608          * ethtool  Local device
1609          *  rx  tx  Pause AsymDir
1610          *  0   0   0     0
1611          *  1   0   1     1
1612          *  0   1   0     1
1613          *  1   1   1     1
1614          * and then use the ethtool rx/tx enablement status to mask the
1615          * rx/tx pause resolution.
1616          */
1617         linkmode_set_pause(config->advertising, pause->tx_pause,
1618                            pause->rx_pause);
1619
1620         manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
1621                          (!(pause_state & MLO_PAUSE_AN) &&
1622                            (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);
1623
1624         config->pause = pause_state;
1625
1626         /* Update our in-band advertisement, triggering a renegotiation if
1627          * the advertisement changed.
1628          */
1629         if (!pl->phydev)
1630                 phylink_change_inband_advert(pl);
1631
1632         mutex_unlock(&pl->state_mutex);
1633
1634         /* If we have a PHY, a change of the pause frame advertisement will
1635          * cause phylib to renegotiate (if AN is enabled) which will in turn
1636          * call our phylink_phy_change() and trigger a resolve.  Note that
1637          * we can't hold our state mutex while calling phy_set_asym_pause().
1638          */
1639         if (pl->phydev)
1640                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1641                                    pause->tx_pause);
1642
1643         /* If the manual pause settings changed, make sure we trigger a
1644          * resolve to update their state; we can not guarantee that the
1645          * link will cycle.
1646          */
1647         if (manual_changed) {
1648                 pl->mac_link_dropped = true;
1649                 phylink_run_resolve(pl);
1650         }
1651
1652         return 0;
1653 }
1654 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1655
1656 /**
1657  * phylink_get_eee_err() - read the energy efficient ethernet error
1658  *   counter
1659  * @pl: a pointer to a &struct phylink returned from phylink_create().
1660  *
1661  * Read the Energy Efficient Ethernet error counter from the PHY associated
1662  * with the phylink instance specified by @pl.
1663  *
1664  * Returns positive error counter value, or negative error code.
1665  */
1666 int phylink_get_eee_err(struct phylink *pl)
1667 {
1668         int ret = 0;
1669
1670         ASSERT_RTNL();
1671
1672         if (pl->phydev)
1673                 ret = phy_get_eee_err(pl->phydev);
1674
1675         return ret;
1676 }
1677 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1678
1679 /**
1680  * phylink_init_eee() - init and check the EEE features
1681  * @pl: a pointer to a &struct phylink returned from phylink_create()
1682  * @clk_stop_enable: allow PHY to stop receive clock
1683  *
1684  * Must be called either with RTNL held or within mac_link_up()
1685  */
1686 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1687 {
1688         int ret = -EOPNOTSUPP;
1689
1690         if (pl->phydev)
1691                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1692
1693         return ret;
1694 }
1695 EXPORT_SYMBOL_GPL(phylink_init_eee);
1696
1697 /**
1698  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1699  * @pl: a pointer to a &struct phylink returned from phylink_create()
1700  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1701  */
1702 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1703 {
1704         int ret = -EOPNOTSUPP;
1705
1706         ASSERT_RTNL();
1707
1708         if (pl->phydev)
1709                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1710
1711         return ret;
1712 }
1713 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1714
1715 /**
1716  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1717  * @pl: a pointer to a &struct phylink returned from phylink_create()
1718  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1719  */
1720 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1721 {
1722         int ret = -EOPNOTSUPP;
1723
1724         ASSERT_RTNL();
1725
1726         if (pl->phydev)
1727                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1728
1729         return ret;
1730 }
1731 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1732
1733 /* This emulates MII registers for a fixed-mode phy operating as per the
1734  * passed in state. "aneg" defines if we report negotiation is possible.
1735  *
1736  * FIXME: should deal with negotiation state too.
1737  */
1738 static int phylink_mii_emul_read(unsigned int reg,
1739                                  struct phylink_link_state *state)
1740 {
1741         struct fixed_phy_status fs;
1742         unsigned long *lpa = state->lp_advertising;
1743         int val;
1744
1745         fs.link = state->link;
1746         fs.speed = state->speed;
1747         fs.duplex = state->duplex;
1748         fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
1749         fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
1750
1751         val = swphy_read_reg(reg, &fs);
1752         if (reg == MII_BMSR) {
1753                 if (!state->an_complete)
1754                         val &= ~BMSR_ANEGCOMPLETE;
1755         }
1756         return val;
1757 }
1758
1759 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1760                             unsigned int reg)
1761 {
1762         struct phy_device *phydev = pl->phydev;
1763         int prtad, devad;
1764
1765         if (mdio_phy_id_is_c45(phy_id)) {
1766                 prtad = mdio_phy_id_prtad(phy_id);
1767                 devad = mdio_phy_id_devad(phy_id);
1768                 devad = mdiobus_c45_addr(devad, reg);
1769         } else if (phydev->is_c45) {
1770                 switch (reg) {
1771                 case MII_BMCR:
1772                 case MII_BMSR:
1773                 case MII_PHYSID1:
1774                 case MII_PHYSID2:
1775                         devad = __ffs(phydev->c45_ids.mmds_present);
1776                         break;
1777                 case MII_ADVERTISE:
1778                 case MII_LPA:
1779                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1780                                 return -EINVAL;
1781                         devad = MDIO_MMD_AN;
1782                         if (reg == MII_ADVERTISE)
1783                                 reg = MDIO_AN_ADVERTISE;
1784                         else
1785                                 reg = MDIO_AN_LPA;
1786                         break;
1787                 default:
1788                         return -EINVAL;
1789                 }
1790                 prtad = phy_id;
1791                 devad = mdiobus_c45_addr(devad, reg);
1792         } else {
1793                 prtad = phy_id;
1794                 devad = reg;
1795         }
1796         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1797 }
1798
1799 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1800                              unsigned int reg, unsigned int val)
1801 {
1802         struct phy_device *phydev = pl->phydev;
1803         int prtad, devad;
1804
1805         if (mdio_phy_id_is_c45(phy_id)) {
1806                 prtad = mdio_phy_id_prtad(phy_id);
1807                 devad = mdio_phy_id_devad(phy_id);
1808                 devad = mdiobus_c45_addr(devad, reg);
1809         } else if (phydev->is_c45) {
1810                 switch (reg) {
1811                 case MII_BMCR:
1812                 case MII_BMSR:
1813                 case MII_PHYSID1:
1814                 case MII_PHYSID2:
1815                         devad = __ffs(phydev->c45_ids.mmds_present);
1816                         break;
1817                 case MII_ADVERTISE:
1818                 case MII_LPA:
1819                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1820                                 return -EINVAL;
1821                         devad = MDIO_MMD_AN;
1822                         if (reg == MII_ADVERTISE)
1823                                 reg = MDIO_AN_ADVERTISE;
1824                         else
1825                                 reg = MDIO_AN_LPA;
1826                         break;
1827                 default:
1828                         return -EINVAL;
1829                 }
1830                 prtad = phy_id;
1831                 devad = mdiobus_c45_addr(devad, reg);
1832         } else {
1833                 prtad = phy_id;
1834                 devad = reg;
1835         }
1836
1837         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1838 }
1839
1840 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1841                             unsigned int reg)
1842 {
1843         struct phylink_link_state state;
1844         int val = 0xffff;
1845
1846         switch (pl->cur_link_an_mode) {
1847         case MLO_AN_FIXED:
1848                 if (phy_id == 0) {
1849                         phylink_get_fixed_state(pl, &state);
1850                         val = phylink_mii_emul_read(reg, &state);
1851                 }
1852                 break;
1853
1854         case MLO_AN_PHY:
1855                 return -EOPNOTSUPP;
1856
1857         case MLO_AN_INBAND:
1858                 if (phy_id == 0) {
1859                         phylink_mac_pcs_get_state(pl, &state);
1860                         val = phylink_mii_emul_read(reg, &state);
1861                 }
1862                 break;
1863         }
1864
1865         return val & 0xffff;
1866 }
1867
1868 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1869                              unsigned int reg, unsigned int val)
1870 {
1871         switch (pl->cur_link_an_mode) {
1872         case MLO_AN_FIXED:
1873                 break;
1874
1875         case MLO_AN_PHY:
1876                 return -EOPNOTSUPP;
1877
1878         case MLO_AN_INBAND:
1879                 break;
1880         }
1881
1882         return 0;
1883 }
1884
1885 /**
1886  * phylink_mii_ioctl() - generic mii ioctl interface
1887  * @pl: a pointer to a &struct phylink returned from phylink_create()
1888  * @ifr: a pointer to a &struct ifreq for socket ioctls
1889  * @cmd: ioctl cmd to execute
1890  *
1891  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1892  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1893  *
1894  * Returns: zero on success or negative error code.
1895  *
1896  * %SIOCGMIIPHY:
1897  *  read register from the current PHY.
1898  * %SIOCGMIIREG:
1899  *  read register from the specified PHY.
1900  * %SIOCSMIIREG:
1901  *  set a register on the specified PHY.
1902  */
1903 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1904 {
1905         struct mii_ioctl_data *mii = if_mii(ifr);
1906         int  ret;
1907
1908         ASSERT_RTNL();
1909
1910         if (pl->phydev) {
1911                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1912                 switch (cmd) {
1913                 case SIOCGMIIPHY:
1914                         mii->phy_id = pl->phydev->mdio.addr;
1915                         fallthrough;
1916
1917                 case SIOCGMIIREG:
1918                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1919                         if (ret >= 0) {
1920                                 mii->val_out = ret;
1921                                 ret = 0;
1922                         }
1923                         break;
1924
1925                 case SIOCSMIIREG:
1926                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1927                                                 mii->val_in);
1928                         break;
1929
1930                 default:
1931                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1932                         break;
1933                 }
1934         } else {
1935                 switch (cmd) {
1936                 case SIOCGMIIPHY:
1937                         mii->phy_id = 0;
1938                         fallthrough;
1939
1940                 case SIOCGMIIREG:
1941                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1942                         if (ret >= 0) {
1943                                 mii->val_out = ret;
1944                                 ret = 0;
1945                         }
1946                         break;
1947
1948                 case SIOCSMIIREG:
1949                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1950                                                 mii->val_in);
1951                         break;
1952
1953                 default:
1954                         ret = -EOPNOTSUPP;
1955                         break;
1956                 }
1957         }
1958
1959         return ret;
1960 }
1961 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1962
1963 /**
1964  * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
1965  *   link partners
1966  * @pl: a pointer to a &struct phylink returned from phylink_create()
1967  * @sync: perform action synchronously
1968  *
1969  * If we have a PHY that is not part of a SFP module, then set the speed
1970  * as described in the phy_speed_down() function. Please see this function
1971  * for a description of the @sync parameter.
1972  *
1973  * Returns zero if there is no PHY, otherwise as per phy_speed_down().
1974  */
1975 int phylink_speed_down(struct phylink *pl, bool sync)
1976 {
1977         int ret = 0;
1978
1979         ASSERT_RTNL();
1980
1981         if (!pl->sfp_bus && pl->phydev)
1982                 ret = phy_speed_down(pl->phydev, sync);
1983
1984         return ret;
1985 }
1986 EXPORT_SYMBOL_GPL(phylink_speed_down);
1987
1988 /**
1989  * phylink_speed_up() - restore the advertised speeds prior to the call to
1990  *   phylink_speed_down()
1991  * @pl: a pointer to a &struct phylink returned from phylink_create()
1992  *
1993  * If we have a PHY that is not part of a SFP module, then restore the
1994  * PHY speeds as per phy_speed_up().
1995  *
1996  * Returns zero if there is no PHY, otherwise as per phy_speed_up().
1997  */
1998 int phylink_speed_up(struct phylink *pl)
1999 {
2000         int ret = 0;
2001
2002         ASSERT_RTNL();
2003
2004         if (!pl->sfp_bus && pl->phydev)
2005                 ret = phy_speed_up(pl->phydev);
2006
2007         return ret;
2008 }
2009 EXPORT_SYMBOL_GPL(phylink_speed_up);
2010
2011 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
2012 {
2013         struct phylink *pl = upstream;
2014
2015         pl->netdev->sfp_bus = bus;
2016 }
2017
2018 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
2019 {
2020         struct phylink *pl = upstream;
2021
2022         pl->netdev->sfp_bus = NULL;
2023 }
2024
2025 static int phylink_sfp_config(struct phylink *pl, u8 mode,
2026                               const unsigned long *supported,
2027                               const unsigned long *advertising)
2028 {
2029         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
2030         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
2031         struct phylink_link_state config;
2032         phy_interface_t iface;
2033         bool changed;
2034         int ret;
2035
2036         linkmode_copy(support, supported);
2037
2038         memset(&config, 0, sizeof(config));
2039         linkmode_copy(config.advertising, advertising);
2040         config.interface = PHY_INTERFACE_MODE_NA;
2041         config.speed = SPEED_UNKNOWN;
2042         config.duplex = DUPLEX_UNKNOWN;
2043         config.pause = MLO_PAUSE_AN;
2044         config.an_enabled = pl->link_config.an_enabled;
2045
2046         /* Ignore errors if we're expecting a PHY to attach later */
2047         ret = phylink_validate(pl, support, &config);
2048         if (ret) {
2049                 phylink_err(pl, "validation with support %*pb failed: %d\n",
2050                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2051                 return ret;
2052         }
2053
2054         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
2055         if (iface == PHY_INTERFACE_MODE_NA) {
2056                 phylink_err(pl,
2057                             "selection of interface failed, advertisement %*pb\n",
2058                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
2059                 return -EINVAL;
2060         }
2061
2062         config.interface = iface;
2063         linkmode_copy(support1, support);
2064         ret = phylink_validate(pl, support1, &config);
2065         if (ret) {
2066                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
2067                             phylink_an_mode_str(mode),
2068                             phy_modes(config.interface),
2069                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2070                 return ret;
2071         }
2072
2073         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
2074                     phylink_an_mode_str(mode), phy_modes(config.interface),
2075                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2076
2077         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
2078                 return -EINVAL;
2079
2080         changed = !linkmode_equal(pl->supported, support);
2081         if (changed) {
2082                 linkmode_copy(pl->supported, support);
2083                 linkmode_copy(pl->link_config.advertising, config.advertising);
2084         }
2085
2086         if (pl->cur_link_an_mode != mode ||
2087             pl->link_config.interface != config.interface) {
2088                 pl->link_config.interface = config.interface;
2089                 pl->cur_link_an_mode = mode;
2090
2091                 changed = true;
2092
2093                 phylink_info(pl, "switched to %s/%s link mode\n",
2094                              phylink_an_mode_str(mode),
2095                              phy_modes(config.interface));
2096         }
2097
2098         pl->link_port = pl->sfp_port;
2099
2100         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
2101                                  &pl->phylink_disable_state))
2102                 phylink_mac_initial_config(pl, false);
2103
2104         return ret;
2105 }
2106
2107 static int phylink_sfp_module_insert(void *upstream,
2108                                      const struct sfp_eeprom_id *id)
2109 {
2110         struct phylink *pl = upstream;
2111         unsigned long *support = pl->sfp_support;
2112
2113         ASSERT_RTNL();
2114
2115         linkmode_zero(support);
2116         sfp_parse_support(pl->sfp_bus, id, support);
2117         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
2118
2119         /* If this module may have a PHY connecting later, defer until later */
2120         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
2121         if (pl->sfp_may_have_phy)
2122                 return 0;
2123
2124         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
2125 }
2126
2127 static int phylink_sfp_module_start(void *upstream)
2128 {
2129         struct phylink *pl = upstream;
2130
2131         /* If this SFP module has a PHY, start the PHY now. */
2132         if (pl->phydev) {
2133                 phy_start(pl->phydev);
2134                 return 0;
2135         }
2136
2137         /* If the module may have a PHY but we didn't detect one we
2138          * need to configure the MAC here.
2139          */
2140         if (!pl->sfp_may_have_phy)
2141                 return 0;
2142
2143         return phylink_sfp_config(pl, MLO_AN_INBAND,
2144                                   pl->sfp_support, pl->sfp_support);
2145 }
2146
2147 static void phylink_sfp_module_stop(void *upstream)
2148 {
2149         struct phylink *pl = upstream;
2150
2151         /* If this SFP module has a PHY, stop it. */
2152         if (pl->phydev)
2153                 phy_stop(pl->phydev);
2154 }
2155
2156 static void phylink_sfp_link_down(void *upstream)
2157 {
2158         struct phylink *pl = upstream;
2159
2160         ASSERT_RTNL();
2161
2162         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
2163 }
2164
2165 static void phylink_sfp_link_up(void *upstream)
2166 {
2167         struct phylink *pl = upstream;
2168
2169         ASSERT_RTNL();
2170
2171         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
2172         phylink_run_resolve(pl);
2173 }
2174
2175 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
2176  * or 802.3z control word, so inband will not work.
2177  */
2178 static bool phylink_phy_no_inband(struct phy_device *phy)
2179 {
2180         return phy->is_c45 &&
2181                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
2182 }
2183
2184 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
2185 {
2186         struct phylink *pl = upstream;
2187         phy_interface_t interface;
2188         u8 mode;
2189         int ret;
2190
2191         /*
2192          * This is the new way of dealing with flow control for PHYs,
2193          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
2194          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
2195          * using our validate call to the MAC, we rely upon the MAC
2196          * clearing the bits from both supported and advertising fields.
2197          */
2198         phy_support_asym_pause(phy);
2199
2200         if (phylink_phy_no_inband(phy))
2201                 mode = MLO_AN_PHY;
2202         else
2203                 mode = MLO_AN_INBAND;
2204
2205         /* Do the initial configuration */
2206         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
2207         if (ret < 0)
2208                 return ret;
2209
2210         interface = pl->link_config.interface;
2211         ret = phylink_attach_phy(pl, phy, interface);
2212         if (ret < 0)
2213                 return ret;
2214
2215         ret = phylink_bringup_phy(pl, phy, interface);
2216         if (ret)
2217                 phy_detach(phy);
2218
2219         return ret;
2220 }
2221
2222 static void phylink_sfp_disconnect_phy(void *upstream)
2223 {
2224         phylink_disconnect_phy(upstream);
2225 }
2226
2227 static const struct sfp_upstream_ops sfp_phylink_ops = {
2228         .attach = phylink_sfp_attach,
2229         .detach = phylink_sfp_detach,
2230         .module_insert = phylink_sfp_module_insert,
2231         .module_start = phylink_sfp_module_start,
2232         .module_stop = phylink_sfp_module_stop,
2233         .link_up = phylink_sfp_link_up,
2234         .link_down = phylink_sfp_link_down,
2235         .connect_phy = phylink_sfp_connect_phy,
2236         .disconnect_phy = phylink_sfp_disconnect_phy,
2237 };
2238
2239 /* Helpers for MAC drivers */
2240
2241 /**
2242  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
2243  * @state: a pointer to a &struct phylink_link_state
2244  *
2245  * Inspect the interface mode, advertising mask or forced speed and
2246  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
2247  * the interface mode to suit.  @state->interface is appropriately
2248  * updated, and the advertising mask has the "other" baseX_Full flag
2249  * cleared.
2250  */
2251 void phylink_helper_basex_speed(struct phylink_link_state *state)
2252 {
2253         if (phy_interface_mode_is_8023z(state->interface)) {
2254                 bool want_2500 = state->an_enabled ?
2255                         phylink_test(state->advertising, 2500baseX_Full) :
2256                         state->speed == SPEED_2500;
2257
2258                 if (want_2500) {
2259                         phylink_clear(state->advertising, 1000baseX_Full);
2260                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
2261                 } else {
2262                         phylink_clear(state->advertising, 2500baseX_Full);
2263                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
2264                 }
2265         }
2266 }
2267 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
2268
2269 static void phylink_decode_c37_word(struct phylink_link_state *state,
2270                                     uint16_t config_reg, int speed)
2271 {
2272         bool tx_pause, rx_pause;
2273         int fd_bit;
2274
2275         if (speed == SPEED_2500)
2276                 fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
2277         else
2278                 fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
2279
2280         mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
2281
2282         if (linkmode_test_bit(fd_bit, state->advertising) &&
2283             linkmode_test_bit(fd_bit, state->lp_advertising)) {
2284                 state->speed = speed;
2285                 state->duplex = DUPLEX_FULL;
2286         } else {
2287                 /* negotiation failure */
2288                 state->link = false;
2289         }
2290
2291         linkmode_resolve_pause(state->advertising, state->lp_advertising,
2292                                &tx_pause, &rx_pause);
2293
2294         if (tx_pause)
2295                 state->pause |= MLO_PAUSE_TX;
2296         if (rx_pause)
2297                 state->pause |= MLO_PAUSE_RX;
2298 }
2299
2300 static void phylink_decode_sgmii_word(struct phylink_link_state *state,
2301                                       uint16_t config_reg)
2302 {
2303         if (!(config_reg & LPA_SGMII_LINK)) {
2304                 state->link = false;
2305                 return;
2306         }
2307
2308         switch (config_reg & LPA_SGMII_SPD_MASK) {
2309         case LPA_SGMII_10:
2310                 state->speed = SPEED_10;
2311                 break;
2312         case LPA_SGMII_100:
2313                 state->speed = SPEED_100;
2314                 break;
2315         case LPA_SGMII_1000:
2316                 state->speed = SPEED_1000;
2317                 break;
2318         default:
2319                 state->link = false;
2320                 return;
2321         }
2322         if (config_reg & LPA_SGMII_FULL_DUPLEX)
2323                 state->duplex = DUPLEX_FULL;
2324         else
2325                 state->duplex = DUPLEX_HALF;
2326 }
2327
2328 /**
2329  * phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
2330  * @state: a pointer to a struct phylink_link_state.
2331  * @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
2332  *
2333  * Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
2334  * code word.  Decode the USXGMII code word and populate the corresponding fields
2335  * (speed, duplex) into the phylink_link_state structure.
2336  */
2337 void phylink_decode_usxgmii_word(struct phylink_link_state *state,
2338                                  uint16_t lpa)
2339 {
2340         switch (lpa & MDIO_USXGMII_SPD_MASK) {
2341         case MDIO_USXGMII_10:
2342                 state->speed = SPEED_10;
2343                 break;
2344         case MDIO_USXGMII_100:
2345                 state->speed = SPEED_100;
2346                 break;
2347         case MDIO_USXGMII_1000:
2348                 state->speed = SPEED_1000;
2349                 break;
2350         case MDIO_USXGMII_2500:
2351                 state->speed = SPEED_2500;
2352                 break;
2353         case MDIO_USXGMII_5000:
2354                 state->speed = SPEED_5000;
2355                 break;
2356         case MDIO_USXGMII_10G:
2357                 state->speed = SPEED_10000;
2358                 break;
2359         default:
2360                 state->link = false;
2361                 return;
2362         }
2363
2364         if (lpa & MDIO_USXGMII_FULL_DUPLEX)
2365                 state->duplex = DUPLEX_FULL;
2366         else
2367                 state->duplex = DUPLEX_HALF;
2368 }
2369 EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
2370
2371 /**
2372  * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
2373  * @pcs: a pointer to a &struct mdio_device.
2374  * @state: a pointer to a &struct phylink_link_state.
2375  *
2376  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2377  * clause 37 negotiation and/or SGMII control.
2378  *
2379  * Read the MAC PCS state from the MII device configured in @config and
2380  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
2381  * the phylink @state structure. This is suitable to be directly plugged
2382  * into the mac_pcs_get_state() member of the struct phylink_mac_ops
2383  * structure.
2384  */
2385 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
2386                                    struct phylink_link_state *state)
2387 {
2388         struct mii_bus *bus = pcs->bus;
2389         int addr = pcs->addr;
2390         int bmsr, lpa;
2391
2392         bmsr = mdiobus_read(bus, addr, MII_BMSR);
2393         lpa = mdiobus_read(bus, addr, MII_LPA);
2394         if (bmsr < 0 || lpa < 0) {
2395                 state->link = false;
2396                 return;
2397         }
2398
2399         state->link = !!(bmsr & BMSR_LSTATUS);
2400         state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
2401         if (!state->link)
2402                 return;
2403
2404         switch (state->interface) {
2405         case PHY_INTERFACE_MODE_1000BASEX:
2406                 phylink_decode_c37_word(state, lpa, SPEED_1000);
2407                 break;
2408
2409         case PHY_INTERFACE_MODE_2500BASEX:
2410                 phylink_decode_c37_word(state, lpa, SPEED_2500);
2411                 break;
2412
2413         case PHY_INTERFACE_MODE_SGMII:
2414         case PHY_INTERFACE_MODE_QSGMII:
2415                 phylink_decode_sgmii_word(state, lpa);
2416                 break;
2417
2418         default:
2419                 state->link = false;
2420                 break;
2421         }
2422 }
2423 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
2424
2425 /**
2426  * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
2427  *      advertisement
2428  * @pcs: a pointer to a &struct mdio_device.
2429  * @interface: the PHY interface mode being configured
2430  * @advertising: the ethtool advertisement mask
2431  *
2432  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2433  * clause 37 negotiation and/or SGMII control.
2434  *
2435  * Configure the clause 37 PCS advertisement as specified by @state. This
2436  * does not trigger a renegotiation; phylink will do that via the
2437  * mac_an_restart() method of the struct phylink_mac_ops structure.
2438  *
2439  * Returns negative error code on failure to configure the advertisement,
2440  * zero if no change has been made, or one if the advertisement has changed.
2441  */
2442 int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
2443                                           phy_interface_t interface,
2444                                           const unsigned long *advertising)
2445 {
2446         struct mii_bus *bus = pcs->bus;
2447         int addr = pcs->addr;
2448         int val, ret;
2449         u16 adv;
2450
2451         switch (interface) {
2452         case PHY_INTERFACE_MODE_1000BASEX:
2453         case PHY_INTERFACE_MODE_2500BASEX:
2454                 adv = ADVERTISE_1000XFULL;
2455                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
2456                                       advertising))
2457                         adv |= ADVERTISE_1000XPAUSE;
2458                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
2459                                       advertising))
2460                         adv |= ADVERTISE_1000XPSE_ASYM;
2461
2462                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2463                 if (val < 0)
2464                         return val;
2465
2466                 if (val == adv)
2467                         return 0;
2468
2469                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
2470                 if (ret < 0)
2471                         return ret;
2472
2473                 return 1;
2474
2475         case PHY_INTERFACE_MODE_SGMII:
2476                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2477                 if (val < 0)
2478                         return val;
2479
2480                 if (val == 0x0001)
2481                         return 0;
2482
2483                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
2484                 if (ret < 0)
2485                         return ret;
2486
2487                 return 1;
2488
2489         default:
2490                 /* Nothing to do for other modes */
2491                 return 0;
2492         }
2493 }
2494 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);
2495
2496 /**
2497  * phylink_mii_c22_pcs_config() - configure clause 22 PCS
2498  * @pcs: a pointer to a &struct mdio_device.
2499  * @mode: link autonegotiation mode
2500  * @interface: the PHY interface mode being configured
2501  * @advertising: the ethtool advertisement mask
2502  *
2503  * Configure a Clause 22 PCS PHY with the appropriate negotiation
2504  * parameters for the @mode, @interface and @advertising parameters.
2505  * Returns negative error number on failure, zero if the advertisement
2506  * has not changed, or positive if there is a change.
2507  */
2508 int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
2509                                phy_interface_t interface,
2510                                const unsigned long *advertising)
2511 {
2512         bool changed;
2513         u16 bmcr;
2514         int ret;
2515
2516         ret = phylink_mii_c22_pcs_set_advertisement(pcs, interface,
2517                                                     advertising);
2518         if (ret < 0)
2519                 return ret;
2520
2521         changed = ret > 0;
2522
2523         /* Ensure ISOLATE bit is disabled */
2524         bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
2525         ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
2526                              BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
2527         if (ret < 0)
2528                 return ret;
2529
2530         return changed ? 1 : 0;
2531 }
2532 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
2533
2534 /**
2535  * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
2536  * @pcs: a pointer to a &struct mdio_device.
2537  *
2538  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2539  * clause 37 negotiation.
2540  *
2541  * Restart the clause 37 negotiation with the link partner. This is
2542  * suitable to be directly plugged into the mac_pcs_get_state() member
2543  * of the struct phylink_mac_ops structure.
2544  */
2545 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
2546 {
2547         struct mii_bus *bus = pcs->bus;
2548         int val, addr = pcs->addr;
2549
2550         val = mdiobus_read(bus, addr, MII_BMCR);
2551         if (val >= 0) {
2552                 val |= BMCR_ANRESTART;
2553
2554                 mdiobus_write(bus, addr, MII_BMCR, val);
2555         }
2556 }
2557 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
2558
2559 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
2560                                    struct phylink_link_state *state)
2561 {
2562         struct mii_bus *bus = pcs->bus;
2563         int addr = pcs->addr;
2564         int stat;
2565
2566         stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
2567         if (stat < 0) {
2568                 state->link = false;
2569                 return;
2570         }
2571
2572         state->link = !!(stat & MDIO_STAT1_LSTATUS);
2573         if (!state->link)
2574                 return;
2575
2576         switch (state->interface) {
2577         case PHY_INTERFACE_MODE_10GBASER:
2578                 state->speed = SPEED_10000;
2579                 state->duplex = DUPLEX_FULL;
2580                 break;
2581
2582         default:
2583                 break;
2584         }
2585 }
2586 EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);
2587
2588 MODULE_LICENSE("GPL v2");