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/acpi.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/export.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/of.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/phy.h>
  16 #include <linux/phy_fixed.h>
  17 #include <linux/phylink.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/timer.h>
  21 #include <linux/workqueue.h>
  22
  23 #include "sfp.h"
  24 #include "swphy.h"
  25
  26 #define SUPPORTED_INTERFACES \
  27         (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
  28          SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
  29 #define ADVERTISED_INTERFACES \
  30         (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
  31          ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
  32
  33 enum {
  34         PHYLINK_DISABLE_STOPPED,
  35         PHYLINK_DISABLE_LINK,
  36 };
  37
  38 /**
  39  * struct phylink - internal data type for phylink
  40  */
  41 struct phylink {
  42         /* private: */
  43         struct net_device *netdev;
  44         const struct phylink_mac_ops *mac_ops;
  45         const struct phylink_pcs_ops *pcs_ops;
  46         struct phylink_config *config;
  47         struct phylink_pcs *pcs;
  48         struct device *dev;
  49         unsigned int old_link_state:1;
  50
  51         unsigned long phylink_disable_state; /* bitmask of disables */
  52         struct phy_device *phydev;
  53         phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
  54         u8 cfg_link_an_mode;            /* MLO_AN_xxx */
  55         u8 cur_link_an_mode;
  56         u8 link_port;                   /* The current non-phy ethtool port */
  57         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
  58
  59         /* The link configuration settings */
  60         struct phylink_link_state link_config;
  61
  62         /* The current settings */
  63         phy_interface_t cur_interface;
  64
  65         struct gpio_desc *link_gpio;
  66         unsigned int link_irq;
  67         struct timer_list link_poll;
  68         void (*get_fixed_state)(struct net_device *dev,
  69                                 struct phylink_link_state *s);
  70
  71         struct mutex state_mutex;
  72         struct phylink_link_state phy_state;
  73         struct work_struct resolve;
  74
  75         bool mac_link_dropped;
  76
  77         struct sfp_bus *sfp_bus;
  78         bool sfp_may_have_phy;
  79         __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
  80         u8 sfp_port;
  81 };
  82
  83 #define phylink_printk(level, pl, fmt, ...) \
  84         do { \
  85                 if ((pl)->config->type == PHYLINK_NETDEV) \
  86                         netdev_printk(level, (pl)->netdev, fmt, ##__VA_ARGS__); \
  87                 else if ((pl)->config->type == PHYLINK_DEV) \
  88                         dev_printk(level, (pl)->dev, fmt, ##__VA_ARGS__); \
  89         } while (0)
  90
  91 #define phylink_err(pl, fmt, ...) \
  92         phylink_printk(KERN_ERR, pl, fmt, ##__VA_ARGS__)
  93 #define phylink_warn(pl, fmt, ...) \
  94         phylink_printk(KERN_WARNING, pl, fmt, ##__VA_ARGS__)
  95 #define phylink_info(pl, fmt, ...) \
  96         phylink_printk(KERN_INFO, pl, fmt, ##__VA_ARGS__)
  97 #if defined(CONFIG_DYNAMIC_DEBUG)
  98 #define phylink_dbg(pl, fmt, ...) \
  99 do {                                                                    \
 100         if ((pl)->config->type == PHYLINK_NETDEV)                       \
 101                 netdev_dbg((pl)->netdev, fmt, ##__VA_ARGS__);           \
 102         else if ((pl)->config->type == PHYLINK_DEV)                     \
 103                 dev_dbg((pl)->dev, fmt, ##__VA_ARGS__);                 \
 104 } while (0)
 105 #elif defined(DEBUG)
 106 #define phylink_dbg(pl, fmt, ...)                                       \
 107         phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__)
 108 #else
 109 #define phylink_dbg(pl, fmt, ...)                                       \
 110 ({                                                                      \
 111         if (0)                                                          \
 112                 phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__);     \
 113 })
 114 #endif
 115
 116 /**
 117  * phylink_set_port_modes() - set the port type modes in the ethtool mask
 118  * @mask: ethtool link mode mask
 119  *
 120  * Sets all the port type modes in the ethtool mask.  MAC drivers should
 121  * use this in their 'validate' callback.
 122  */
 123 void phylink_set_port_modes(unsigned long *mask)
 124 {
 125         phylink_set(mask, TP);
 126         phylink_set(mask, AUI);
 127         phylink_set(mask, MII);
 128         phylink_set(mask, FIBRE);
 129         phylink_set(mask, BNC);
 130         phylink_set(mask, Backplane);
 131 }
 132 EXPORT_SYMBOL_GPL(phylink_set_port_modes);
 133
 134 static int phylink_is_empty_linkmode(const unsigned long *linkmode)
 135 {
 136         __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };
 137
 138         phylink_set_port_modes(tmp);
 139         phylink_set(tmp, Autoneg);
 140         phylink_set(tmp, Pause);
 141         phylink_set(tmp, Asym_Pause);
 142
 143         return linkmode_subset(linkmode, tmp);
 144 }
 145
 146 static const char *phylink_an_mode_str(unsigned int mode)
 147 {
 148         static const char *modestr[] = {
 149                 [MLO_AN_PHY] = "phy",
 150                 [MLO_AN_FIXED] = "fixed",
 151                 [MLO_AN_INBAND] = "inband",
 152         };
 153
 154         return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 155 }
 156
 157 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 158                             struct phylink_link_state *state)
 159 {
 160         pl->mac_ops->validate(pl->config, supported, state);
 161
 162         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 163 }
 164
 165 static int phylink_parse_fixedlink(struct phylink *pl,
 166                                    struct fwnode_handle *fwnode)
 167 {
 168         struct fwnode_handle *fixed_node;
 169         const struct phy_setting *s;
 170         struct gpio_desc *desc;
 171         u32 speed;
 172         int ret;
 173
 174         fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
 175         if (fixed_node) {
 176                 ret = fwnode_property_read_u32(fixed_node, "speed", &speed);
 177
 178                 pl->link_config.speed = speed;
 179                 pl->link_config.duplex = DUPLEX_HALF;
 180
 181                 if (fwnode_property_read_bool(fixed_node, "full-duplex"))
 182                         pl->link_config.duplex = DUPLEX_FULL;
 183
 184                 /* We treat the "pause" and "asym-pause" terminology as
 185                  * defining the link partner's ability.
 186                  */
 187                 if (fwnode_property_read_bool(fixed_node, "pause"))
 188                         __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 189                                   pl->link_config.lp_advertising);
 190                 if (fwnode_property_read_bool(fixed_node, "asym-pause"))
 191                         __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 192                                   pl->link_config.lp_advertising);
 193
 194                 if (ret == 0) {
 195                         desc = fwnode_gpiod_get_index(fixed_node, "link", 0,
 196                                                       GPIOD_IN, "?");
 197
 198                         if (!IS_ERR(desc))
 199                                 pl->link_gpio = desc;
 200                         else if (desc == ERR_PTR(-EPROBE_DEFER))
 201                                 ret = -EPROBE_DEFER;
 202                 }
 203                 fwnode_handle_put(fixed_node);
 204
 205                 if (ret)
 206                         return ret;
 207         } else {
 208                 u32 prop[5];
 209
 210                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 211                                                      NULL, 0);
 212                 if (ret != ARRAY_SIZE(prop)) {
 213                         phylink_err(pl, "broken fixed-link?\n");
 214                         return -EINVAL;
 215                 }
 216
 217                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 218                                                      prop, ARRAY_SIZE(prop));
 219                 if (!ret) {
 220                         pl->link_config.duplex = prop[1] ?
 221                                                 DUPLEX_FULL : DUPLEX_HALF;
 222                         pl->link_config.speed = prop[2];
 223                         if (prop[3])
 224                                 __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 225                                           pl->link_config.lp_advertising);
 226                         if (prop[4])
 227                                 __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 228                                           pl->link_config.lp_advertising);
 229                 }
 230         }
 231
 232         if (pl->link_config.speed > SPEED_1000 &&
 233             pl->link_config.duplex != DUPLEX_FULL)
 234                 phylink_warn(pl, "fixed link specifies half duplex for %dMbps link?\n",
 235                              pl->link_config.speed);
 236
 237         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 238         linkmode_copy(pl->link_config.advertising, pl->supported);
 239         phylink_validate(pl, pl->supported, &pl->link_config);
 240
 241         s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 242                                pl->supported, true);
 243         linkmode_zero(pl->supported);
 244         phylink_set(pl->supported, MII);
 245         phylink_set(pl->supported, Pause);
 246         phylink_set(pl->supported, Asym_Pause);
 247         phylink_set(pl->supported, Autoneg);
 248         if (s) {
 249                 __set_bit(s->bit, pl->supported);
 250                 __set_bit(s->bit, pl->link_config.lp_advertising);
 251         } else {
 252                 phylink_warn(pl, "fixed link %s duplex %dMbps not recognised\n",
 253                              pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
 254                              pl->link_config.speed);
 255         }
 256
 257         linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
 258                      pl->supported);
 259
 260         pl->link_config.link = 1;
 261         pl->link_config.an_complete = 1;
 262
 263         return 0;
 264 }
 265
 266 static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
 267 {
 268         struct fwnode_handle *dn;
 269         const char *managed;
 270
 271         dn = fwnode_get_named_child_node(fwnode, "fixed-link");
 272         if (dn || fwnode_property_present(fwnode, "fixed-link"))
 273                 pl->cfg_link_an_mode = MLO_AN_FIXED;
 274         fwnode_handle_put(dn);
 275
 276         if ((fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
 277              strcmp(managed, "in-band-status") == 0) ||
 278             pl->config->ovr_an_inband) {
 279                 if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 280                         phylink_err(pl,
 281                                     "can't use both fixed-link and in-band-status\n");
 282                         return -EINVAL;
 283                 }
 284
 285                 linkmode_zero(pl->supported);
 286                 phylink_set(pl->supported, MII);
 287                 phylink_set(pl->supported, Autoneg);
 288                 phylink_set(pl->supported, Asym_Pause);
 289                 phylink_set(pl->supported, Pause);
 290                 pl->link_config.an_enabled = true;
 291                 pl->cfg_link_an_mode = MLO_AN_INBAND;
 292
 293                 switch (pl->link_config.interface) {
 294                 case PHY_INTERFACE_MODE_SGMII:
 295                 case PHY_INTERFACE_MODE_QSGMII:
 296                         phylink_set(pl->supported, 10baseT_Half);
 297                         phylink_set(pl->supported, 10baseT_Full);
 298                         phylink_set(pl->supported, 100baseT_Half);
 299                         phylink_set(pl->supported, 100baseT_Full);
 300                         phylink_set(pl->supported, 1000baseT_Half);
 301                         phylink_set(pl->supported, 1000baseT_Full);
 302                         break;
 303
 304                 case PHY_INTERFACE_MODE_1000BASEX:
 305                         phylink_set(pl->supported, 1000baseX_Full);
 306                         break;
 307
 308                 case PHY_INTERFACE_MODE_2500BASEX:
 309                         phylink_set(pl->supported, 2500baseX_Full);
 310                         break;
 311
 312                 case PHY_INTERFACE_MODE_5GBASER:
 313                         phylink_set(pl->supported, 5000baseT_Full);
 314                         break;
 315
 316                 case PHY_INTERFACE_MODE_25GBASER:
 317                         phylink_set(pl->supported, 25000baseCR_Full);
 318                         phylink_set(pl->supported, 25000baseKR_Full);
 319                         phylink_set(pl->supported, 25000baseSR_Full);
 320                         fallthrough;
 321                 case PHY_INTERFACE_MODE_USXGMII:
 322                 case PHY_INTERFACE_MODE_10GKR:
 323                 case PHY_INTERFACE_MODE_10GBASER:
 324                         phylink_set(pl->supported, 10baseT_Half);
 325                         phylink_set(pl->supported, 10baseT_Full);
 326                         phylink_set(pl->supported, 100baseT_Half);
 327                         phylink_set(pl->supported, 100baseT_Full);
 328                         phylink_set(pl->supported, 1000baseT_Half);
 329                         phylink_set(pl->supported, 1000baseT_Full);
 330                         phylink_set(pl->supported, 1000baseX_Full);
 331                         phylink_set(pl->supported, 1000baseKX_Full);
 332                         phylink_set(pl->supported, 2500baseT_Full);
 333                         phylink_set(pl->supported, 2500baseX_Full);
 334                         phylink_set(pl->supported, 5000baseT_Full);
 335                         phylink_set(pl->supported, 10000baseT_Full);
 336                         phylink_set(pl->supported, 10000baseKR_Full);
 337                         phylink_set(pl->supported, 10000baseKX4_Full);
 338                         phylink_set(pl->supported, 10000baseCR_Full);
 339                         phylink_set(pl->supported, 10000baseSR_Full);
 340                         phylink_set(pl->supported, 10000baseLR_Full);
 341                         phylink_set(pl->supported, 10000baseLRM_Full);
 342                         phylink_set(pl->supported, 10000baseER_Full);
 343                         break;
 344
 345                 case PHY_INTERFACE_MODE_XLGMII:
 346                         phylink_set(pl->supported, 25000baseCR_Full);
 347                         phylink_set(pl->supported, 25000baseKR_Full);
 348                         phylink_set(pl->supported, 25000baseSR_Full);
 349                         phylink_set(pl->supported, 40000baseKR4_Full);
 350                         phylink_set(pl->supported, 40000baseCR4_Full);
 351                         phylink_set(pl->supported, 40000baseSR4_Full);
 352                         phylink_set(pl->supported, 40000baseLR4_Full);
 353                         phylink_set(pl->supported, 50000baseCR2_Full);
 354                         phylink_set(pl->supported, 50000baseKR2_Full);
 355                         phylink_set(pl->supported, 50000baseSR2_Full);
 356                         phylink_set(pl->supported, 50000baseKR_Full);
 357                         phylink_set(pl->supported, 50000baseSR_Full);
 358                         phylink_set(pl->supported, 50000baseCR_Full);
 359                         phylink_set(pl->supported, 50000baseLR_ER_FR_Full);
 360                         phylink_set(pl->supported, 50000baseDR_Full);
 361                         phylink_set(pl->supported, 100000baseKR4_Full);
 362                         phylink_set(pl->supported, 100000baseSR4_Full);
 363                         phylink_set(pl->supported, 100000baseCR4_Full);
 364                         phylink_set(pl->supported, 100000baseLR4_ER4_Full);
 365                         phylink_set(pl->supported, 100000baseKR2_Full);
 366                         phylink_set(pl->supported, 100000baseSR2_Full);
 367                         phylink_set(pl->supported, 100000baseCR2_Full);
 368                         phylink_set(pl->supported, 100000baseLR2_ER2_FR2_Full);
 369                         phylink_set(pl->supported, 100000baseDR2_Full);
 370                         break;
 371
 372                 default:
 373                         phylink_err(pl,
 374                                     "incorrect link mode %s for in-band status\n",
 375                                     phy_modes(pl->link_config.interface));
 376                         return -EINVAL;
 377                 }
 378
 379                 linkmode_copy(pl->link_config.advertising, pl->supported);
 380
 381                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 382                         phylink_err(pl,
 383                                     "failed to validate link configuration for in-band status\n");
 384                         return -EINVAL;
 385                 }
 386
 387                 /* Check if MAC/PCS also supports Autoneg. */
 388                 pl->link_config.an_enabled = phylink_test(pl->supported, Autoneg);
 389         }
 390
 391         return 0;
 392 }
 393
 394 static void phylink_apply_manual_flow(struct phylink *pl,
 395                                       struct phylink_link_state *state)
 396 {
 397         /* If autoneg is disabled, pause AN is also disabled */
 398         if (!state->an_enabled)
 399                 state->pause &= ~MLO_PAUSE_AN;
 400
 401         /* Manual configuration of pause modes */
 402         if (!(pl->link_config.pause & MLO_PAUSE_AN))
 403                 state->pause = pl->link_config.pause;
 404 }
 405
 406 static void phylink_resolve_flow(struct phylink_link_state *state)
 407 {
 408         bool tx_pause, rx_pause;
 409
 410         state->pause = MLO_PAUSE_NONE;
 411         if (state->duplex == DUPLEX_FULL) {
 412                 linkmode_resolve_pause(state->advertising,
 413                                        state->lp_advertising,
 414                                        &tx_pause, &rx_pause);
 415                 if (tx_pause)
 416                         state->pause |= MLO_PAUSE_TX;
 417                 if (rx_pause)
 418                         state->pause |= MLO_PAUSE_RX;
 419         }
 420 }
 421
 422 static void phylink_mac_config(struct phylink *pl,
 423                                const struct phylink_link_state *state)
 424 {
 425         phylink_dbg(pl,
 426                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 427                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 428                     phy_modes(state->interface),
 429                     phy_speed_to_str(state->speed),
 430                     phy_duplex_to_str(state->duplex),
 431                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 432                     state->pause, state->link, state->an_enabled);
 433
 434         pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 435 }
 436
 437 static void phylink_mac_pcs_an_restart(struct phylink *pl)
 438 {
 439         if (pl->link_config.an_enabled &&
 440             phy_interface_mode_is_8023z(pl->link_config.interface) &&
 441             phylink_autoneg_inband(pl->cur_link_an_mode)) {
 442                 if (pl->pcs_ops)
 443                         pl->pcs_ops->pcs_an_restart(pl->pcs);
 444                 else
 445                         pl->mac_ops->mac_an_restart(pl->config);
 446         }
 447 }
 448
 449 static void phylink_major_config(struct phylink *pl, bool restart,
 450                                   const struct phylink_link_state *state)
 451 {
 452         int err;
 453
 454         phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
 455
 456         if (pl->mac_ops->mac_prepare) {
 457                 err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
 458                                                state->interface);
 459                 if (err < 0) {
 460                         phylink_err(pl, "mac_prepare failed: %pe\n",
 461                                     ERR_PTR(err));
 462                         return;
 463                 }
 464         }
 465
 466         phylink_mac_config(pl, state);
 467
 468         if (pl->pcs_ops) {
 469                 err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 470                                               state->interface,
 471                                               state->advertising,
 472                                               !!(pl->link_config.pause &
 473                                                  MLO_PAUSE_AN));
 474                 if (err < 0)
 475                         phylink_err(pl, "pcs_config failed: %pe\n",
 476                                     ERR_PTR(err));
 477                 if (err > 0)
 478                         restart = true;
 479         }
 480         if (restart)
 481                 phylink_mac_pcs_an_restart(pl);
 482
 483         if (pl->mac_ops->mac_finish) {
 484                 err = pl->mac_ops->mac_finish(pl->config, pl->cur_link_an_mode,
 485                                               state->interface);
 486                 if (err < 0)
 487                         phylink_err(pl, "mac_finish failed: %pe\n",
 488                                     ERR_PTR(err));
 489         }
 490 }
 491
 492 /*
 493  * Reconfigure for a change of inband advertisement.
 494  * If we have a separate PCS, we only need to call its pcs_config() method,
 495  * and then restart AN if it indicates something changed. Otherwise, we do
 496  * the full MAC reconfiguration.
 497  */
 498 static int phylink_change_inband_advert(struct phylink *pl)
 499 {
 500         int ret;
 501
 502         if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
 503                 return 0;
 504
 505         if (!pl->pcs_ops) {
 506                 /* Legacy method */
 507                 phylink_mac_config(pl, &pl->link_config);
 508                 phylink_mac_pcs_an_restart(pl);
 509                 return 0;
 510         }
 511
 512         phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
 513                     phylink_an_mode_str(pl->cur_link_an_mode),
 514                     phy_modes(pl->link_config.interface),
 515                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->link_config.advertising,
 516                     pl->link_config.pause);
 517
 518         /* Modern PCS-based method; update the advert at the PCS, and
 519          * restart negotiation if the pcs_config() helper indicates that
 520          * the programmed advertisement has changed.
 521          */
 522         ret = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 523                                       pl->link_config.interface,
 524                                       pl->link_config.advertising,
 525                                       !!(pl->link_config.pause & MLO_PAUSE_AN));
 526         if (ret < 0)
 527                 return ret;
 528
 529         if (ret > 0)
 530                 phylink_mac_pcs_an_restart(pl);
 531
 532         return 0;
 533 }
 534
 535 static void phylink_mac_pcs_get_state(struct phylink *pl,
 536                                       struct phylink_link_state *state)
 537 {
 538         linkmode_copy(state->advertising, pl->link_config.advertising);
 539         linkmode_zero(state->lp_advertising);
 540         state->interface = pl->link_config.interface;
 541         state->an_enabled = pl->link_config.an_enabled;
 542         state->speed = SPEED_UNKNOWN;
 543         state->duplex = DUPLEX_UNKNOWN;
 544         state->pause = MLO_PAUSE_NONE;
 545         state->an_complete = 0;
 546         state->link = 1;
 547
 548         if (pl->pcs_ops)
 549                 pl->pcs_ops->pcs_get_state(pl->pcs, state);
 550         else if (pl->mac_ops->mac_pcs_get_state)
 551                 pl->mac_ops->mac_pcs_get_state(pl->config, state);
 552         else
 553                 state->link = 0;
 554 }
 555
 556 /* The fixed state is... fixed except for the link state,
 557  * which may be determined by a GPIO or a callback.
 558  */
 559 static void phylink_get_fixed_state(struct phylink *pl,
 560                                     struct phylink_link_state *state)
 561 {
 562         *state = pl->link_config;
 563         if (pl->config->get_fixed_state)
 564                 pl->config->get_fixed_state(pl->config, state);
 565         else if (pl->link_gpio)
 566                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 567
 568         phylink_resolve_flow(state);
 569 }
 570
 571 static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
 572 {
 573         struct phylink_link_state link_state;
 574
 575         switch (pl->cur_link_an_mode) {
 576         case MLO_AN_PHY:
 577                 link_state = pl->phy_state;
 578                 break;
 579
 580         case MLO_AN_FIXED:
 581                 phylink_get_fixed_state(pl, &link_state);
 582                 break;
 583
 584         case MLO_AN_INBAND:
 585                 link_state = pl->link_config;
 586                 if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
 587                         link_state.pause = MLO_PAUSE_NONE;
 588                 break;
 589
 590         default: /* can't happen */
 591                 return;
 592         }
 593
 594         link_state.link = false;
 595
 596         phylink_apply_manual_flow(pl, &link_state);
 597         phylink_major_config(pl, force_restart, &link_state);
 598 }
 599
 600 static const char *phylink_pause_to_str(int pause)
 601 {
 602         switch (pause & MLO_PAUSE_TXRX_MASK) {
 603         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 604                 return "rx/tx";
 605         case MLO_PAUSE_TX:
 606                 return "tx";
 607         case MLO_PAUSE_RX:
 608                 return "rx";
 609         default:
 610                 return "off";
 611         }
 612 }
 613
 614 static void phylink_link_up(struct phylink *pl,
 615                             struct phylink_link_state link_state)
 616 {
 617         struct net_device *ndev = pl->netdev;
 618
 619         pl->cur_interface = link_state.interface;
 620
 621         if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
 622                 pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
 623                                          pl->cur_interface,
 624                                          link_state.speed, link_state.duplex);
 625
 626         pl->mac_ops->mac_link_up(pl->config, pl->phydev,
 627                                  pl->cur_link_an_mode, pl->cur_interface,
 628                                  link_state.speed, link_state.duplex,
 629                                  !!(link_state.pause & MLO_PAUSE_TX),
 630                                  !!(link_state.pause & MLO_PAUSE_RX));
 631
 632         if (ndev)
 633                 netif_carrier_on(ndev);
 634
 635         phylink_info(pl,
 636                      "Link is Up - %s/%s - flow control %s\n",
 637                      phy_speed_to_str(link_state.speed),
 638                      phy_duplex_to_str(link_state.duplex),
 639                      phylink_pause_to_str(link_state.pause));
 640 }
 641
 642 static void phylink_link_down(struct phylink *pl)
 643 {
 644         struct net_device *ndev = pl->netdev;
 645
 646         if (ndev)
 647                 netif_carrier_off(ndev);
 648         pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 649                                    pl->cur_interface);
 650         phylink_info(pl, "Link is Down\n");
 651 }
 652
 653 static void phylink_resolve(struct work_struct *w)
 654 {
 655         struct phylink *pl = container_of(w, struct phylink, resolve);
 656         struct phylink_link_state link_state;
 657         struct net_device *ndev = pl->netdev;
 658         bool mac_config = false;
 659         bool cur_link_state;
 660
 661         mutex_lock(&pl->state_mutex);
 662         if (pl->netdev)
 663                 cur_link_state = netif_carrier_ok(ndev);
 664         else
 665                 cur_link_state = pl->old_link_state;
 666
 667         if (pl->phylink_disable_state) {
 668                 pl->mac_link_dropped = false;
 669                 link_state.link = false;
 670         } else if (pl->mac_link_dropped) {
 671                 link_state.link = false;
 672         } else {
 673                 switch (pl->cur_link_an_mode) {
 674                 case MLO_AN_PHY:
 675                         link_state = pl->phy_state;
 676                         phylink_apply_manual_flow(pl, &link_state);
 677                         mac_config = link_state.link;
 678                         break;
 679
 680                 case MLO_AN_FIXED:
 681                         phylink_get_fixed_state(pl, &link_state);
 682                         mac_config = link_state.link;
 683                         break;
 684
 685                 case MLO_AN_INBAND:
 686                         phylink_mac_pcs_get_state(pl, &link_state);
 687
 688                         /* If we have a phy, the "up" state is the union of
 689                          * both the PHY and the MAC
 690                          */
 691                         if (pl->phydev)
 692                                 link_state.link &= pl->phy_state.link;
 693
 694                         /* Only update if the PHY link is up */
 695                         if (pl->phydev && pl->phy_state.link) {
 696                                 link_state.interface = pl->phy_state.interface;
 697
 698                                 /* If we have a PHY, we need to update with
 699                                  * the PHY flow control bits.
 700                                  */
 701                                 link_state.pause = pl->phy_state.pause;
 702                                 mac_config = true;
 703                         }
 704                         phylink_apply_manual_flow(pl, &link_state);
 705                         break;
 706                 }
 707         }
 708
 709         if (mac_config) {
 710                 if (link_state.interface != pl->link_config.interface) {
 711                         /* The interface has changed, force the link down and
 712                          * then reconfigure.
 713                          */
 714                         if (cur_link_state) {
 715                                 phylink_link_down(pl);
 716                                 cur_link_state = false;
 717                         }
 718                         phylink_major_config(pl, false, &link_state);
 719                         pl->link_config.interface = link_state.interface;
 720                 } else if (!pl->pcs_ops) {
 721                         /* The interface remains unchanged, only the speed,
 722                          * duplex or pause settings have changed. Call the
 723                          * old mac_config() method to configure the MAC/PCS
 724                          * only if we do not have a PCS installed (an
 725                          * unconverted user.)
 726                          */
 727                         phylink_mac_config(pl, &link_state);
 728                 }
 729         }
 730
 731         if (link_state.link != cur_link_state) {
 732                 pl->old_link_state = link_state.link;
 733                 if (!link_state.link)
 734                         phylink_link_down(pl);
 735                 else
 736                         phylink_link_up(pl, link_state);
 737         }
 738         if (!link_state.link && pl->mac_link_dropped) {
 739                 pl->mac_link_dropped = false;
 740                 queue_work(system_power_efficient_wq, &pl->resolve);
 741         }
 742         mutex_unlock(&pl->state_mutex);
 743 }
 744
 745 static void phylink_run_resolve(struct phylink *pl)
 746 {
 747         if (!pl->phylink_disable_state)
 748                 queue_work(system_power_efficient_wq, &pl->resolve);
 749 }
 750
 751 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 752 {
 753         unsigned long state = pl->phylink_disable_state;
 754
 755         set_bit(bit, &pl->phylink_disable_state);
 756         if (state == 0) {
 757                 queue_work(system_power_efficient_wq, &pl->resolve);
 758                 flush_work(&pl->resolve);
 759         }
 760 }
 761
 762 static void phylink_fixed_poll(struct timer_list *t)
 763 {
 764         struct phylink *pl = container_of(t, struct phylink, link_poll);
 765
 766         mod_timer(t, jiffies + HZ);
 767
 768         phylink_run_resolve(pl);
 769 }
 770
 771 static const struct sfp_upstream_ops sfp_phylink_ops;
 772
 773 static int phylink_register_sfp(struct phylink *pl,
 774                                 struct fwnode_handle *fwnode)
 775 {
 776         struct sfp_bus *bus;
 777         int ret;
 778
 779         if (!fwnode)
 780                 return 0;
 781
 782         bus = sfp_bus_find_fwnode(fwnode);
 783         if (IS_ERR(bus)) {
 784                 ret = PTR_ERR(bus);
 785                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 786                 return ret;
 787         }
 788
 789         pl->sfp_bus = bus;
 790
 791         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 792         sfp_bus_put(bus);
 793
 794         return ret;
 795 }
 796
 797 /**
 798  * phylink_create() - create a phylink instance
 799  * @config: a pointer to the target &struct phylink_config
 800  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 801  *      interface
 802  * @iface: the desired link mode defined by &typedef phy_interface_t
 803  * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
 804  *
 805  * Create a new phylink instance, and parse the link parameters found in @np.
 806  * This will parse in-band modes, fixed-link or SFP configuration.
 807  *
 808  * Note: the rtnl lock must not be held when calling this function.
 809  *
 810  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 811  * must use IS_ERR() to check for errors from this function.
 812  */
 813 struct phylink *phylink_create(struct phylink_config *config,
 814                                struct fwnode_handle *fwnode,
 815                                phy_interface_t iface,
 816                                const struct phylink_mac_ops *mac_ops)
 817 {
 818         struct phylink *pl;
 819         int ret;
 820
 821         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 822         if (!pl)
 823                 return ERR_PTR(-ENOMEM);
 824
 825         mutex_init(&pl->state_mutex);
 826         INIT_WORK(&pl->resolve, phylink_resolve);
 827
 828         pl->config = config;
 829         if (config->type == PHYLINK_NETDEV) {
 830                 pl->netdev = to_net_dev(config->dev);
 831         } else if (config->type == PHYLINK_DEV) {
 832                 pl->dev = config->dev;
 833         } else {
 834                 kfree(pl);
 835                 return ERR_PTR(-EINVAL);
 836         }
 837
 838         pl->phy_state.interface = iface;
 839         pl->link_interface = iface;
 840         if (iface == PHY_INTERFACE_MODE_MOCA)
 841                 pl->link_port = PORT_BNC;
 842         else
 843                 pl->link_port = PORT_MII;
 844         pl->link_config.interface = iface;
 845         pl->link_config.pause = MLO_PAUSE_AN;
 846         pl->link_config.speed = SPEED_UNKNOWN;
 847         pl->link_config.duplex = DUPLEX_UNKNOWN;
 848         pl->link_config.an_enabled = true;
 849         pl->mac_ops = mac_ops;
 850         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 851         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 852
 853         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 854         linkmode_copy(pl->link_config.advertising, pl->supported);
 855         phylink_validate(pl, pl->supported, &pl->link_config);
 856
 857         ret = phylink_parse_mode(pl, fwnode);
 858         if (ret < 0) {
 859                 kfree(pl);
 860                 return ERR_PTR(ret);
 861         }
 862
 863         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 864                 ret = phylink_parse_fixedlink(pl, fwnode);
 865                 if (ret < 0) {
 866                         kfree(pl);
 867                         return ERR_PTR(ret);
 868                 }
 869         }
 870
 871         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 872
 873         ret = phylink_register_sfp(pl, fwnode);
 874         if (ret < 0) {
 875                 kfree(pl);
 876                 return ERR_PTR(ret);
 877         }
 878
 879         return pl;
 880 }
 881 EXPORT_SYMBOL_GPL(phylink_create);
 882
 883 /**
 884  * phylink_set_pcs() - set the current PCS for phylink to use
 885  * @pl: a pointer to a &struct phylink returned from phylink_create()
 886  * @pcs: a pointer to the &struct phylink_pcs
 887  *
 888  * Bind the MAC PCS to phylink.  This may be called after phylink_create(),
 889  * in mac_prepare() or mac_config() methods if it is desired to dynamically
 890  * change the PCS.
 891  *
 892  * Please note that there are behavioural changes with the mac_config()
 893  * callback if a PCS is present (denoting a newer setup) so removing a PCS
 894  * is not supported, and if a PCS is going to be used, it must be registered
 895  * by calling phylink_set_pcs() at the latest in the first mac_config() call.
 896  */
 897 void phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs)
 898 {
 899         pl->pcs = pcs;
 900         pl->pcs_ops = pcs->ops;
 901 }
 902 EXPORT_SYMBOL_GPL(phylink_set_pcs);
 903
 904 /**
 905  * phylink_destroy() - cleanup and destroy the phylink instance
 906  * @pl: a pointer to a &struct phylink returned from phylink_create()
 907  *
 908  * Destroy a phylink instance. Any PHY that has been attached must have been
 909  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 910  *
 911  * Note: the rtnl lock must not be held when calling this function.
 912  */
 913 void phylink_destroy(struct phylink *pl)
 914 {
 915         sfp_bus_del_upstream(pl->sfp_bus);
 916         if (pl->link_gpio)
 917                 gpiod_put(pl->link_gpio);
 918
 919         cancel_work_sync(&pl->resolve);
 920         kfree(pl);
 921 }
 922 EXPORT_SYMBOL_GPL(phylink_destroy);
 923
 924 static void phylink_phy_change(struct phy_device *phydev, bool up)
 925 {
 926         struct phylink *pl = phydev->phylink;
 927         bool tx_pause, rx_pause;
 928
 929         phy_get_pause(phydev, &tx_pause, &rx_pause);
 930
 931         mutex_lock(&pl->state_mutex);
 932         pl->phy_state.speed = phydev->speed;
 933         pl->phy_state.duplex = phydev->duplex;
 934         pl->phy_state.pause = MLO_PAUSE_NONE;
 935         if (tx_pause)
 936                 pl->phy_state.pause |= MLO_PAUSE_TX;
 937         if (rx_pause)
 938                 pl->phy_state.pause |= MLO_PAUSE_RX;
 939         pl->phy_state.interface = phydev->interface;
 940         pl->phy_state.link = up;
 941         mutex_unlock(&pl->state_mutex);
 942
 943         phylink_run_resolve(pl);
 944
 945         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 946                     phy_modes(phydev->interface),
 947                     phy_speed_to_str(phydev->speed),
 948                     phy_duplex_to_str(phydev->duplex));
 949 }
 950
 951 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 952                                phy_interface_t interface)
 953 {
 954         struct phylink_link_state config;
 955         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 956         char *irq_str;
 957         int ret;
 958
 959         /*
 960          * This is the new way of dealing with flow control for PHYs,
 961          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 962          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 963          * using our validate call to the MAC, we rely upon the MAC
 964          * clearing the bits from both supported and advertising fields.
 965          */
 966         phy_support_asym_pause(phy);
 967
 968         memset(&config, 0, sizeof(config));
 969         linkmode_copy(supported, phy->supported);
 970         linkmode_copy(config.advertising, phy->advertising);
 971
 972         /* Clause 45 PHYs switch their Serdes lane between several different
 973          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 974          * speeds. We really need to know which interface modes the PHY and
 975          * MAC supports to properly work out which linkmodes can be supported.
 976          */
 977         if (phy->is_c45 &&
 978             interface != PHY_INTERFACE_MODE_RXAUI &&
 979             interface != PHY_INTERFACE_MODE_XAUI &&
 980             interface != PHY_INTERFACE_MODE_USXGMII)
 981                 config.interface = PHY_INTERFACE_MODE_NA;
 982         else
 983                 config.interface = interface;
 984
 985         ret = phylink_validate(pl, supported, &config);
 986         if (ret) {
 987                 phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
 988                              phy_modes(config.interface),
 989                              __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
 990                              __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
 991                              ret);
 992                 return ret;
 993         }
 994
 995         phy->phylink = pl;
 996         phy->phy_link_change = phylink_phy_change;
 997
 998         irq_str = phy_attached_info_irq(phy);
 999         phylink_info(pl,
1000                      "PHY [%s] driver [%s] (irq=%s)\n",
1001                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
1002         kfree(irq_str);
1003
1004         mutex_lock(&phy->lock);
1005         mutex_lock(&pl->state_mutex);
1006         pl->phydev = phy;
1007         pl->phy_state.interface = interface;
1008         pl->phy_state.pause = MLO_PAUSE_NONE;
1009         pl->phy_state.speed = SPEED_UNKNOWN;
1010         pl->phy_state.duplex = DUPLEX_UNKNOWN;
1011         linkmode_copy(pl->supported, supported);
1012         linkmode_copy(pl->link_config.advertising, config.advertising);
1013
1014         /* Restrict the phy advertisement according to the MAC support. */
1015         linkmode_copy(phy->advertising, config.advertising);
1016         mutex_unlock(&pl->state_mutex);
1017         mutex_unlock(&phy->lock);
1018
1019         phylink_dbg(pl,
1020                     "phy: setting supported %*pb advertising %*pb\n",
1021                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
1022                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
1023
1024         if (phy_interrupt_is_valid(phy))
1025                 phy_request_interrupt(phy);
1026
1027         return 0;
1028 }
1029
1030 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
1031                               phy_interface_t interface)
1032 {
1033         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
1034                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1035                      phy_interface_mode_is_8023z(interface))))
1036                 return -EINVAL;
1037
1038         if (pl->phydev)
1039                 return -EBUSY;
1040
1041         return phy_attach_direct(pl->netdev, phy, 0, interface);
1042 }
1043
1044 /**
1045  * phylink_connect_phy() - connect a PHY to the phylink instance
1046  * @pl: a pointer to a &struct phylink returned from phylink_create()
1047  * @phy: a pointer to a &struct phy_device.
1048  *
1049  * Connect @phy to the phylink instance specified by @pl by calling
1050  * phy_attach_direct(). Configure the @phy according to the MAC driver's
1051  * capabilities, start the PHYLIB state machine and enable any interrupts
1052  * that the PHY supports.
1053  *
1054  * This updates the phylink's ethtool supported and advertising link mode
1055  * masks.
1056  *
1057  * Returns 0 on success or a negative errno.
1058  */
1059 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
1060 {
1061         int ret;
1062
1063         /* Use PHY device/driver interface */
1064         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1065                 pl->link_interface = phy->interface;
1066                 pl->link_config.interface = pl->link_interface;
1067         }
1068
1069         ret = phylink_attach_phy(pl, phy, pl->link_interface);
1070         if (ret < 0)
1071                 return ret;
1072
1073         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
1074         if (ret)
1075                 phy_detach(phy);
1076
1077         return ret;
1078 }
1079 EXPORT_SYMBOL_GPL(phylink_connect_phy);
1080
1081 /**
1082  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
1083  * @pl: a pointer to a &struct phylink returned from phylink_create()
1084  * @dn: a pointer to a &struct device_node.
1085  * @flags: PHY-specific flags to communicate to the PHY device driver
1086  *
1087  * Connect the phy specified in the device node @dn to the phylink instance
1088  * specified by @pl. Actions specified in phylink_connect_phy() will be
1089  * performed.
1090  *
1091  * Returns 0 on success or a negative errno.
1092  */
1093 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
1094                            u32 flags)
1095 {
1096         return phylink_fwnode_phy_connect(pl, of_fwnode_handle(dn), flags);
1097 }
1098 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
1099
1100 /**
1101  * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
1102  * @pl: a pointer to a &struct phylink returned from phylink_create()
1103  * @fwnode: a pointer to a &struct fwnode_handle.
1104  * @flags: PHY-specific flags to communicate to the PHY device driver
1105  *
1106  * Connect the phy specified @fwnode to the phylink instance specified
1107  * by @pl.
1108  *
1109  * Returns 0 on success or a negative errno.
1110  */
1111 int phylink_fwnode_phy_connect(struct phylink *pl,
1112                                struct fwnode_handle *fwnode,
1113                                u32 flags)
1114 {
1115         struct fwnode_handle *phy_fwnode;
1116         struct phy_device *phy_dev;
1117         int ret;
1118
1119         /* Fixed links and 802.3z are handled without needing a PHY */
1120         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
1121             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1122              phy_interface_mode_is_8023z(pl->link_interface)))
1123                 return 0;
1124
1125         phy_fwnode = fwnode_get_phy_node(fwnode);
1126         if (IS_ERR(phy_fwnode)) {
1127                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
1128                         return -ENODEV;
1129                 return 0;
1130         }
1131
1132         phy_dev = fwnode_phy_find_device(phy_fwnode);
1133         /* We're done with the phy_node handle */
1134         fwnode_handle_put(phy_fwnode);
1135         if (!phy_dev)
1136                 return -ENODEV;
1137
1138         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
1139                                 pl->link_interface);
1140         if (ret) {
1141                 phy_device_free(phy_dev);
1142                 return ret;
1143         }
1144
1145         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
1146         if (ret)
1147                 phy_detach(phy_dev);
1148
1149         return ret;
1150 }
1151 EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);
1152
1153 /**
1154  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
1155  *   instance.
1156  * @pl: a pointer to a &struct phylink returned from phylink_create()
1157  *
1158  * Disconnect any current PHY from the phylink instance described by @pl.
1159  */
1160 void phylink_disconnect_phy(struct phylink *pl)
1161 {
1162         struct phy_device *phy;
1163
1164         ASSERT_RTNL();
1165
1166         phy = pl->phydev;
1167         if (phy) {
1168                 mutex_lock(&phy->lock);
1169                 mutex_lock(&pl->state_mutex);
1170                 pl->phydev = NULL;
1171                 mutex_unlock(&pl->state_mutex);
1172                 mutex_unlock(&phy->lock);
1173                 flush_work(&pl->resolve);
1174
1175                 phy_disconnect(phy);
1176         }
1177 }
1178 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
1179
1180 /**
1181  * phylink_mac_change() - notify phylink of a change in MAC state
1182  * @pl: a pointer to a &struct phylink returned from phylink_create()
1183  * @up: indicates whether the link is currently up.
1184  *
1185  * The MAC driver should call this driver when the state of its link
1186  * changes (eg, link failure, new negotiation results, etc.)
1187  */
1188 void phylink_mac_change(struct phylink *pl, bool up)
1189 {
1190         if (!up)
1191                 pl->mac_link_dropped = true;
1192         phylink_run_resolve(pl);
1193         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
1194 }
1195 EXPORT_SYMBOL_GPL(phylink_mac_change);
1196
1197 static irqreturn_t phylink_link_handler(int irq, void *data)
1198 {
1199         struct phylink *pl = data;
1200
1201         phylink_run_resolve(pl);
1202
1203         return IRQ_HANDLED;
1204 }
1205
1206 /**
1207  * phylink_start() - start a phylink instance
1208  * @pl: a pointer to a &struct phylink returned from phylink_create()
1209  *
1210  * Start the phylink instance specified by @pl, configuring the MAC for the
1211  * desired link mode(s) and negotiation style. This should be called from the
1212  * network device driver's &struct net_device_ops ndo_open() method.
1213  */
1214 void phylink_start(struct phylink *pl)
1215 {
1216         bool poll = false;
1217
1218         ASSERT_RTNL();
1219
1220         phylink_info(pl, "configuring for %s/%s link mode\n",
1221                      phylink_an_mode_str(pl->cur_link_an_mode),
1222                      phy_modes(pl->link_config.interface));
1223
1224         /* Always set the carrier off */
1225         if (pl->netdev)
1226                 netif_carrier_off(pl->netdev);
1227
1228         /* Apply the link configuration to the MAC when starting. This allows
1229          * a fixed-link to start with the correct parameters, and also
1230          * ensures that we set the appropriate advertisement for Serdes links.
1231          *
1232          * Restart autonegotiation if using 802.3z to ensure that the link
1233          * parameters are properly negotiated.  This is necessary for DSA
1234          * switches using 802.3z negotiation to ensure they see our modes.
1235          */
1236         phylink_mac_initial_config(pl, true);
1237
1238         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1239         phylink_run_resolve(pl);
1240
1241         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1242                 int irq = gpiod_to_irq(pl->link_gpio);
1243
1244                 if (irq > 0) {
1245                         if (!request_irq(irq, phylink_link_handler,
1246                                          IRQF_TRIGGER_RISING |
1247                                          IRQF_TRIGGER_FALLING,
1248                                          "netdev link", pl))
1249                                 pl->link_irq = irq;
1250                         else
1251                                 irq = 0;
1252                 }
1253                 if (irq <= 0)
1254                         poll = true;
1255         }
1256
1257         switch (pl->cfg_link_an_mode) {
1258         case MLO_AN_FIXED:
1259                 poll |= pl->config->poll_fixed_state;
1260                 break;
1261         case MLO_AN_INBAND:
1262                 poll |= pl->config->pcs_poll;
1263                 if (pl->pcs)
1264                         poll |= pl->pcs->poll;
1265                 break;
1266         }
1267         if (poll)
1268                 mod_timer(&pl->link_poll, jiffies + HZ);
1269         if (pl->phydev)
1270                 phy_start(pl->phydev);
1271         if (pl->sfp_bus)
1272                 sfp_upstream_start(pl->sfp_bus);
1273 }
1274 EXPORT_SYMBOL_GPL(phylink_start);
1275
1276 /**
1277  * phylink_stop() - stop a phylink instance
1278  * @pl: a pointer to a &struct phylink returned from phylink_create()
1279  *
1280  * Stop the phylink instance specified by @pl. This should be called from the
1281  * network device driver's &struct net_device_ops ndo_stop() method.  The
1282  * network device's carrier state should not be changed prior to calling this
1283  * function.
1284  */
1285 void phylink_stop(struct phylink *pl)
1286 {
1287         ASSERT_RTNL();
1288
1289         if (pl->sfp_bus)
1290                 sfp_upstream_stop(pl->sfp_bus);
1291         if (pl->phydev)
1292                 phy_stop(pl->phydev);
1293         del_timer_sync(&pl->link_poll);
1294         if (pl->link_irq) {
1295                 free_irq(pl->link_irq, pl);
1296                 pl->link_irq = 0;
1297         }
1298
1299         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1300 }
1301 EXPORT_SYMBOL_GPL(phylink_stop);
1302
1303 /**
1304  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1305  * @pl: a pointer to a &struct phylink returned from phylink_create()
1306  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1307  *
1308  * Read the wake on lan parameters from the PHY attached to the phylink
1309  * instance specified by @pl. If no PHY is currently attached, report no
1310  * support for wake on lan.
1311  */
1312 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1313 {
1314         ASSERT_RTNL();
1315
1316         wol->supported = 0;
1317         wol->wolopts = 0;
1318
1319         if (pl->phydev)
1320                 phy_ethtool_get_wol(pl->phydev, wol);
1321 }
1322 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1323
1324 /**
1325  * phylink_ethtool_set_wol() - set wake on lan parameters
1326  * @pl: a pointer to a &struct phylink returned from phylink_create()
1327  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1328  *
1329  * Set the wake on lan parameters for the PHY attached to the phylink
1330  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1331  * error.
1332  *
1333  * Returns zero on success or negative errno code.
1334  */
1335 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1336 {
1337         int ret = -EOPNOTSUPP;
1338
1339         ASSERT_RTNL();
1340
1341         if (pl->phydev)
1342                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1343
1344         return ret;
1345 }
1346 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1347
1348 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1349 {
1350         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1351
1352         linkmode_zero(mask);
1353         phylink_set_port_modes(mask);
1354
1355         linkmode_and(dst, dst, mask);
1356         linkmode_or(dst, dst, b);
1357 }
1358
1359 static void phylink_get_ksettings(const struct phylink_link_state *state,
1360                                   struct ethtool_link_ksettings *kset)
1361 {
1362         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1363         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1364         kset->base.speed = state->speed;
1365         kset->base.duplex = state->duplex;
1366         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1367                                 AUTONEG_DISABLE;
1368 }
1369
1370 /**
1371  * phylink_ethtool_ksettings_get() - get the current link settings
1372  * @pl: a pointer to a &struct phylink returned from phylink_create()
1373  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1374  *
1375  * Read the current link settings for the phylink instance specified by @pl.
1376  * This will be the link settings read from the MAC, PHY or fixed link
1377  * settings depending on the current negotiation mode.
1378  */
1379 int phylink_ethtool_ksettings_get(struct phylink *pl,
1380                                   struct ethtool_link_ksettings *kset)
1381 {
1382         struct phylink_link_state link_state;
1383
1384         ASSERT_RTNL();
1385
1386         if (pl->phydev)
1387                 phy_ethtool_ksettings_get(pl->phydev, kset);
1388         else
1389                 kset->base.port = pl->link_port;
1390
1391         linkmode_copy(kset->link_modes.supported, pl->supported);
1392
1393         switch (pl->cur_link_an_mode) {
1394         case MLO_AN_FIXED:
1395                 /* We are using fixed settings. Report these as the
1396                  * current link settings - and note that these also
1397                  * represent the supported speeds/duplex/pause modes.
1398                  */
1399                 phylink_get_fixed_state(pl, &link_state);
1400                 phylink_get_ksettings(&link_state, kset);
1401                 break;
1402
1403         case MLO_AN_INBAND:
1404                 /* If there is a phy attached, then use the reported
1405                  * settings from the phy with no modification.
1406                  */
1407                 if (pl->phydev)
1408                         break;
1409
1410                 phylink_mac_pcs_get_state(pl, &link_state);
1411
1412                 /* The MAC is reporting the link results from its own PCS
1413                  * layer via in-band status. Report these as the current
1414                  * link settings.
1415                  */
1416                 phylink_get_ksettings(&link_state, kset);
1417                 break;
1418         }
1419
1420         return 0;
1421 }
1422 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1423
1424 /**
1425  * phylink_ethtool_ksettings_set() - set the link settings
1426  * @pl: a pointer to a &struct phylink returned from phylink_create()
1427  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1428  */
1429 int phylink_ethtool_ksettings_set(struct phylink *pl,
1430                                   const struct ethtool_link_ksettings *kset)
1431 {
1432         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1433         struct phylink_link_state config;
1434         const struct phy_setting *s;
1435
1436         ASSERT_RTNL();
1437
1438         if (pl->phydev) {
1439                 /* We can rely on phylib for this update; we also do not need
1440                  * to update the pl->link_config settings:
1441                  * - the configuration returned via ksettings_get() will come
1442                  *   from phylib whenever a PHY is present.
1443                  * - link_config.interface will be updated by the PHY calling
1444                  *   back via phylink_phy_change() and a subsequent resolve.
1445                  * - initial link configuration for PHY mode comes from the
1446                  *   last phy state updated via phylink_phy_change().
1447                  * - other configuration changes (e.g. pause modes) are
1448                  *   performed directly via phylib.
1449                  * - if in in-band mode with a PHY, the link configuration
1450                  *   is passed on the link from the PHY, and all of
1451                  *   link_config.{speed,duplex,an_enabled,pause} are not used.
1452                  * - the only possible use would be link_config.advertising
1453                  *   pause modes when in 1000base-X mode with a PHY, but in
1454                  *   the presence of a PHY, this should not be changed as that
1455                  *   should be determined from the media side advertisement.
1456                  */
1457                 return phy_ethtool_ksettings_set(pl->phydev, kset);
1458         }
1459
1460         linkmode_copy(support, pl->supported);
1461         config = pl->link_config;
1462         config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
1463
1464         /* Mask out unsupported advertisements, and force the autoneg bit */
1465         linkmode_and(config.advertising, kset->link_modes.advertising,
1466                      support);
1467         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
1468                          config.an_enabled);
1469
1470         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1471         switch (kset->base.autoneg) {
1472         case AUTONEG_DISABLE:
1473                 /* Autonegotiation disabled, select a suitable speed and
1474                  * duplex.
1475                  */
1476                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1477                                        support, false);
1478                 if (!s)
1479                         return -EINVAL;
1480
1481                 /* If we have a fixed link, refuse to change link parameters.
1482                  * If the link parameters match, accept them but do nothing.
1483                  */
1484                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1485                         if (s->speed != pl->link_config.speed ||
1486                             s->duplex != pl->link_config.duplex)
1487                                 return -EINVAL;
1488                         return 0;
1489                 }
1490
1491                 config.speed = s->speed;
1492                 config.duplex = s->duplex;
1493                 break;
1494
1495         case AUTONEG_ENABLE:
1496                 /* If we have a fixed link, allow autonegotiation (since that
1497                  * is our default case) but do not allow the advertisement to
1498                  * be changed. If the advertisement matches, simply return.
1499                  */
1500                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1501                         if (!linkmode_equal(config.advertising,
1502                                             pl->link_config.advertising))
1503                                 return -EINVAL;
1504                         return 0;
1505                 }
1506
1507                 config.speed = SPEED_UNKNOWN;
1508                 config.duplex = DUPLEX_UNKNOWN;
1509                 break;
1510
1511         default:
1512                 return -EINVAL;
1513         }
1514
1515         /* We have ruled out the case with a PHY attached, and the
1516          * fixed-link cases.  All that is left are in-band links.
1517          */
1518         if (phylink_validate(pl, support, &config))
1519                 return -EINVAL;
1520
1521         /* If autonegotiation is enabled, we must have an advertisement */
1522         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
1523                 return -EINVAL;
1524
1525         mutex_lock(&pl->state_mutex);
1526         pl->link_config.speed = config.speed;
1527         pl->link_config.duplex = config.duplex;
1528         pl->link_config.an_enabled = config.an_enabled;
1529
1530         if (pl->link_config.interface != config.interface) {
1531                 /* The interface changed, e.g. 1000base-X <-> 2500base-X */
1532                 /* We need to force the link down, then change the interface */
1533                 if (pl->old_link_state) {
1534                         phylink_link_down(pl);
1535                         pl->old_link_state = false;
1536                 }
1537                 if (!test_bit(PHYLINK_DISABLE_STOPPED,
1538                               &pl->phylink_disable_state))
1539                         phylink_major_config(pl, false, &config);
1540                 pl->link_config.interface = config.interface;
1541                 linkmode_copy(pl->link_config.advertising, config.advertising);
1542         } else if (!linkmode_equal(pl->link_config.advertising,
1543                                    config.advertising)) {
1544                 linkmode_copy(pl->link_config.advertising, config.advertising);
1545                 phylink_change_inband_advert(pl);
1546         }
1547         mutex_unlock(&pl->state_mutex);
1548
1549         return 0;
1550 }
1551 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1552
1553 /**
1554  * phylink_ethtool_nway_reset() - restart negotiation
1555  * @pl: a pointer to a &struct phylink returned from phylink_create()
1556  *
1557  * Restart negotiation for the phylink instance specified by @pl. This will
1558  * cause any attached phy to restart negotiation with the link partner, and
1559  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1560  * negotiation.
1561  *
1562  * Returns zero on success, or negative error code.
1563  */
1564 int phylink_ethtool_nway_reset(struct phylink *pl)
1565 {
1566         int ret = 0;
1567
1568         ASSERT_RTNL();
1569
1570         if (pl->phydev)
1571                 ret = phy_restart_aneg(pl->phydev);
1572         phylink_mac_pcs_an_restart(pl);
1573
1574         return ret;
1575 }
1576 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1577
1578 /**
1579  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1580  * @pl: a pointer to a &struct phylink returned from phylink_create()
1581  * @pause: a pointer to a &struct ethtool_pauseparam
1582  */
1583 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1584                                     struct ethtool_pauseparam *pause)
1585 {
1586         ASSERT_RTNL();
1587
1588         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1589         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1590         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1591 }
1592 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1593
1594 /**
1595  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1596  * @pl: a pointer to a &struct phylink returned from phylink_create()
1597  * @pause: a pointer to a &struct ethtool_pauseparam
1598  */
1599 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1600                                    struct ethtool_pauseparam *pause)
1601 {
1602         struct phylink_link_state *config = &pl->link_config;
1603         bool manual_changed;
1604         int pause_state;
1605
1606         ASSERT_RTNL();
1607
1608         if (pl->cur_link_an_mode == MLO_AN_FIXED)
1609                 return -EOPNOTSUPP;
1610
1611         if (!phylink_test(pl->supported, Pause) &&
1612             !phylink_test(pl->supported, Asym_Pause))
1613                 return -EOPNOTSUPP;
1614
1615         if (!phylink_test(pl->supported, Asym_Pause) &&
1616             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1617                 return -EINVAL;
1618
1619         pause_state = 0;
1620         if (pause->autoneg)
1621                 pause_state |= MLO_PAUSE_AN;
1622         if (pause->rx_pause)
1623                 pause_state |= MLO_PAUSE_RX;
1624         if (pause->tx_pause)
1625                 pause_state |= MLO_PAUSE_TX;
1626
1627         mutex_lock(&pl->state_mutex);
1628         /*
1629          * See the comments for linkmode_set_pause(), wrt the deficiencies
1630          * with the current implementation.  A solution to this issue would
1631          * be:
1632          * ethtool  Local device
1633          *  rx  tx  Pause AsymDir
1634          *  0   0   0     0
1635          *  1   0   1     1
1636          *  0   1   0     1
1637          *  1   1   1     1
1638          * and then use the ethtool rx/tx enablement status to mask the
1639          * rx/tx pause resolution.
1640          */
1641         linkmode_set_pause(config->advertising, pause->tx_pause,
1642                            pause->rx_pause);
1643
1644         manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
1645                          (!(pause_state & MLO_PAUSE_AN) &&
1646                            (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);
1647
1648         config->pause = pause_state;
1649
1650         /* Update our in-band advertisement, triggering a renegotiation if
1651          * the advertisement changed.
1652          */
1653         if (!pl->phydev)
1654                 phylink_change_inband_advert(pl);
1655
1656         mutex_unlock(&pl->state_mutex);
1657
1658         /* If we have a PHY, a change of the pause frame advertisement will
1659          * cause phylib to renegotiate (if AN is enabled) which will in turn
1660          * call our phylink_phy_change() and trigger a resolve.  Note that
1661          * we can't hold our state mutex while calling phy_set_asym_pause().
1662          */
1663         if (pl->phydev)
1664                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1665                                    pause->tx_pause);
1666
1667         /* If the manual pause settings changed, make sure we trigger a
1668          * resolve to update their state; we can not guarantee that the
1669          * link will cycle.
1670          */
1671         if (manual_changed) {
1672                 pl->mac_link_dropped = true;
1673                 phylink_run_resolve(pl);
1674         }
1675
1676         return 0;
1677 }
1678 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1679
1680 /**
1681  * phylink_get_eee_err() - read the energy efficient ethernet error
1682  *   counter
1683  * @pl: a pointer to a &struct phylink returned from phylink_create().
1684  *
1685  * Read the Energy Efficient Ethernet error counter from the PHY associated
1686  * with the phylink instance specified by @pl.
1687  *
1688  * Returns positive error counter value, or negative error code.
1689  */
1690 int phylink_get_eee_err(struct phylink *pl)
1691 {
1692         int ret = 0;
1693
1694         ASSERT_RTNL();
1695
1696         if (pl->phydev)
1697                 ret = phy_get_eee_err(pl->phydev);
1698
1699         return ret;
1700 }
1701 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1702
1703 /**
1704  * phylink_init_eee() - init and check the EEE features
1705  * @pl: a pointer to a &struct phylink returned from phylink_create()
1706  * @clk_stop_enable: allow PHY to stop receive clock
1707  *
1708  * Must be called either with RTNL held or within mac_link_up()
1709  */
1710 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1711 {
1712         int ret = -EOPNOTSUPP;
1713
1714         if (pl->phydev)
1715                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1716
1717         return ret;
1718 }
1719 EXPORT_SYMBOL_GPL(phylink_init_eee);
1720
1721 /**
1722  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1723  * @pl: a pointer to a &struct phylink returned from phylink_create()
1724  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1725  */
1726 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1727 {
1728         int ret = -EOPNOTSUPP;
1729
1730         ASSERT_RTNL();
1731
1732         if (pl->phydev)
1733                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1734
1735         return ret;
1736 }
1737 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1738
1739 /**
1740  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1741  * @pl: a pointer to a &struct phylink returned from phylink_create()
1742  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1743  */
1744 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1745 {
1746         int ret = -EOPNOTSUPP;
1747
1748         ASSERT_RTNL();
1749
1750         if (pl->phydev)
1751                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1752
1753         return ret;
1754 }
1755 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1756
1757 /* This emulates MII registers for a fixed-mode phy operating as per the
1758  * passed in state. "aneg" defines if we report negotiation is possible.
1759  *
1760  * FIXME: should deal with negotiation state too.
1761  */
1762 static int phylink_mii_emul_read(unsigned int reg,
1763                                  struct phylink_link_state *state)
1764 {
1765         struct fixed_phy_status fs;
1766         unsigned long *lpa = state->lp_advertising;
1767         int val;
1768
1769         fs.link = state->link;
1770         fs.speed = state->speed;
1771         fs.duplex = state->duplex;
1772         fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
1773         fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
1774
1775         val = swphy_read_reg(reg, &fs);
1776         if (reg == MII_BMSR) {
1777                 if (!state->an_complete)
1778                         val &= ~BMSR_ANEGCOMPLETE;
1779         }
1780         return val;
1781 }
1782
1783 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1784                             unsigned int reg)
1785 {
1786         struct phy_device *phydev = pl->phydev;
1787         int prtad, devad;
1788
1789         if (mdio_phy_id_is_c45(phy_id)) {
1790                 prtad = mdio_phy_id_prtad(phy_id);
1791                 devad = mdio_phy_id_devad(phy_id);
1792                 devad = mdiobus_c45_addr(devad, reg);
1793         } else if (phydev->is_c45) {
1794                 switch (reg) {
1795                 case MII_BMCR:
1796                 case MII_BMSR:
1797                 case MII_PHYSID1:
1798                 case MII_PHYSID2:
1799                         devad = __ffs(phydev->c45_ids.mmds_present);
1800                         break;
1801                 case MII_ADVERTISE:
1802                 case MII_LPA:
1803                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1804                                 return -EINVAL;
1805                         devad = MDIO_MMD_AN;
1806                         if (reg == MII_ADVERTISE)
1807                                 reg = MDIO_AN_ADVERTISE;
1808                         else
1809                                 reg = MDIO_AN_LPA;
1810                         break;
1811                 default:
1812                         return -EINVAL;
1813                 }
1814                 prtad = phy_id;
1815                 devad = mdiobus_c45_addr(devad, reg);
1816         } else {
1817                 prtad = phy_id;
1818                 devad = reg;
1819         }
1820         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1821 }
1822
1823 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1824                              unsigned int reg, unsigned int val)
1825 {
1826         struct phy_device *phydev = pl->phydev;
1827         int prtad, devad;
1828
1829         if (mdio_phy_id_is_c45(phy_id)) {
1830                 prtad = mdio_phy_id_prtad(phy_id);
1831                 devad = mdio_phy_id_devad(phy_id);
1832                 devad = mdiobus_c45_addr(devad, reg);
1833         } else if (phydev->is_c45) {
1834                 switch (reg) {
1835                 case MII_BMCR:
1836                 case MII_BMSR:
1837                 case MII_PHYSID1:
1838                 case MII_PHYSID2:
1839                         devad = __ffs(phydev->c45_ids.mmds_present);
1840                         break;
1841                 case MII_ADVERTISE:
1842                 case MII_LPA:
1843                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
1844                                 return -EINVAL;
1845                         devad = MDIO_MMD_AN;
1846                         if (reg == MII_ADVERTISE)
1847                                 reg = MDIO_AN_ADVERTISE;
1848                         else
1849                                 reg = MDIO_AN_LPA;
1850                         break;
1851                 default:
1852                         return -EINVAL;
1853                 }
1854                 prtad = phy_id;
1855                 devad = mdiobus_c45_addr(devad, reg);
1856         } else {
1857                 prtad = phy_id;
1858                 devad = reg;
1859         }
1860
1861         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1862 }
1863
1864 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1865                             unsigned int reg)
1866 {
1867         struct phylink_link_state state;
1868         int val = 0xffff;
1869
1870         switch (pl->cur_link_an_mode) {
1871         case MLO_AN_FIXED:
1872                 if (phy_id == 0) {
1873                         phylink_get_fixed_state(pl, &state);
1874                         val = phylink_mii_emul_read(reg, &state);
1875                 }
1876                 break;
1877
1878         case MLO_AN_PHY:
1879                 return -EOPNOTSUPP;
1880
1881         case MLO_AN_INBAND:
1882                 if (phy_id == 0) {
1883                         phylink_mac_pcs_get_state(pl, &state);
1884                         val = phylink_mii_emul_read(reg, &state);
1885                 }
1886                 break;
1887         }
1888
1889         return val & 0xffff;
1890 }
1891
1892 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1893                              unsigned int reg, unsigned int val)
1894 {
1895         switch (pl->cur_link_an_mode) {
1896         case MLO_AN_FIXED:
1897                 break;
1898
1899         case MLO_AN_PHY:
1900                 return -EOPNOTSUPP;
1901
1902         case MLO_AN_INBAND:
1903                 break;
1904         }
1905
1906         return 0;
1907 }
1908
1909 /**
1910  * phylink_mii_ioctl() - generic mii ioctl interface
1911  * @pl: a pointer to a &struct phylink returned from phylink_create()
1912  * @ifr: a pointer to a &struct ifreq for socket ioctls
1913  * @cmd: ioctl cmd to execute
1914  *
1915  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1916  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1917  *
1918  * Returns: zero on success or negative error code.
1919  *
1920  * %SIOCGMIIPHY:
1921  *  read register from the current PHY.
1922  * %SIOCGMIIREG:
1923  *  read register from the specified PHY.
1924  * %SIOCSMIIREG:
1925  *  set a register on the specified PHY.
1926  */
1927 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1928 {
1929         struct mii_ioctl_data *mii = if_mii(ifr);
1930         int  ret;
1931
1932         ASSERT_RTNL();
1933
1934         if (pl->phydev) {
1935                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1936                 switch (cmd) {
1937                 case SIOCGMIIPHY:
1938                         mii->phy_id = pl->phydev->mdio.addr;
1939                         fallthrough;
1940
1941                 case SIOCGMIIREG:
1942                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1943                         if (ret >= 0) {
1944                                 mii->val_out = ret;
1945                                 ret = 0;
1946                         }
1947                         break;
1948
1949                 case SIOCSMIIREG:
1950                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1951                                                 mii->val_in);
1952                         break;
1953
1954                 default:
1955                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1956                         break;
1957                 }
1958         } else {
1959                 switch (cmd) {
1960                 case SIOCGMIIPHY:
1961                         mii->phy_id = 0;
1962                         fallthrough;
1963
1964                 case SIOCGMIIREG:
1965                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1966                         if (ret >= 0) {
1967                                 mii->val_out = ret;
1968                                 ret = 0;
1969                         }
1970                         break;
1971
1972                 case SIOCSMIIREG:
1973                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1974                                                 mii->val_in);
1975                         break;
1976
1977                 default:
1978                         ret = -EOPNOTSUPP;
1979                         break;
1980                 }
1981         }
1982
1983         return ret;
1984 }
1985 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1986
1987 /**
1988  * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
1989  *   link partners
1990  * @pl: a pointer to a &struct phylink returned from phylink_create()
1991  * @sync: perform action synchronously
1992  *
1993  * If we have a PHY that is not part of a SFP module, then set the speed
1994  * as described in the phy_speed_down() function. Please see this function
1995  * for a description of the @sync parameter.
1996  *
1997  * Returns zero if there is no PHY, otherwise as per phy_speed_down().
1998  */
1999 int phylink_speed_down(struct phylink *pl, bool sync)
2000 {
2001         int ret = 0;
2002
2003         ASSERT_RTNL();
2004
2005         if (!pl->sfp_bus && pl->phydev)
2006                 ret = phy_speed_down(pl->phydev, sync);
2007
2008         return ret;
2009 }
2010 EXPORT_SYMBOL_GPL(phylink_speed_down);
2011
2012 /**
2013  * phylink_speed_up() - restore the advertised speeds prior to the call to
2014  *   phylink_speed_down()
2015  * @pl: a pointer to a &struct phylink returned from phylink_create()
2016  *
2017  * If we have a PHY that is not part of a SFP module, then restore the
2018  * PHY speeds as per phy_speed_up().
2019  *
2020  * Returns zero if there is no PHY, otherwise as per phy_speed_up().
2021  */
2022 int phylink_speed_up(struct phylink *pl)
2023 {
2024         int ret = 0;
2025
2026         ASSERT_RTNL();
2027
2028         if (!pl->sfp_bus && pl->phydev)
2029                 ret = phy_speed_up(pl->phydev);
2030
2031         return ret;
2032 }
2033 EXPORT_SYMBOL_GPL(phylink_speed_up);
2034
2035 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
2036 {
2037         struct phylink *pl = upstream;
2038
2039         pl->netdev->sfp_bus = bus;
2040 }
2041
2042 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
2043 {
2044         struct phylink *pl = upstream;
2045
2046         pl->netdev->sfp_bus = NULL;
2047 }
2048
2049 static int phylink_sfp_config(struct phylink *pl, u8 mode,
2050                               const unsigned long *supported,
2051                               const unsigned long *advertising)
2052 {
2053         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
2054         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
2055         struct phylink_link_state config;
2056         phy_interface_t iface;
2057         bool changed;
2058         int ret;
2059
2060         linkmode_copy(support, supported);
2061
2062         memset(&config, 0, sizeof(config));
2063         linkmode_copy(config.advertising, advertising);
2064         config.interface = PHY_INTERFACE_MODE_NA;
2065         config.speed = SPEED_UNKNOWN;
2066         config.duplex = DUPLEX_UNKNOWN;
2067         config.pause = MLO_PAUSE_AN;
2068         config.an_enabled = pl->link_config.an_enabled;
2069
2070         /* Ignore errors if we're expecting a PHY to attach later */
2071         ret = phylink_validate(pl, support, &config);
2072         if (ret) {
2073                 phylink_err(pl, "validation with support %*pb failed: %d\n",
2074                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2075                 return ret;
2076         }
2077
2078         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
2079         if (iface == PHY_INTERFACE_MODE_NA) {
2080                 phylink_err(pl,
2081                             "selection of interface failed, advertisement %*pb\n",
2082                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
2083                 return -EINVAL;
2084         }
2085
2086         config.interface = iface;
2087         linkmode_copy(support1, support);
2088         ret = phylink_validate(pl, support1, &config);
2089         if (ret) {
2090                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
2091                             phylink_an_mode_str(mode),
2092                             phy_modes(config.interface),
2093                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
2094                 return ret;
2095         }
2096
2097         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
2098                     phylink_an_mode_str(mode), phy_modes(config.interface),
2099                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2100
2101         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
2102                 return -EINVAL;
2103
2104         changed = !linkmode_equal(pl->supported, support);
2105         if (changed) {
2106                 linkmode_copy(pl->supported, support);
2107                 linkmode_copy(pl->link_config.advertising, config.advertising);
2108         }
2109
2110         if (pl->cur_link_an_mode != mode ||
2111             pl->link_config.interface != config.interface) {
2112                 pl->link_config.interface = config.interface;
2113                 pl->cur_link_an_mode = mode;
2114
2115                 changed = true;
2116
2117                 phylink_info(pl, "switched to %s/%s link mode\n",
2118                              phylink_an_mode_str(mode),
2119                              phy_modes(config.interface));
2120         }
2121
2122         pl->link_port = pl->sfp_port;
2123
2124         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
2125                                  &pl->phylink_disable_state))
2126                 phylink_mac_initial_config(pl, false);
2127
2128         return ret;
2129 }
2130
2131 static int phylink_sfp_module_insert(void *upstream,
2132                                      const struct sfp_eeprom_id *id)
2133 {
2134         struct phylink *pl = upstream;
2135         unsigned long *support = pl->sfp_support;
2136
2137         ASSERT_RTNL();
2138
2139         linkmode_zero(support);
2140         sfp_parse_support(pl->sfp_bus, id, support);
2141         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
2142
2143         /* If this module may have a PHY connecting later, defer until later */
2144         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
2145         if (pl->sfp_may_have_phy)
2146                 return 0;
2147
2148         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
2149 }
2150
2151 static int phylink_sfp_module_start(void *upstream)
2152 {
2153         struct phylink *pl = upstream;
2154
2155         /* If this SFP module has a PHY, start the PHY now. */
2156         if (pl->phydev) {
2157                 phy_start(pl->phydev);
2158                 return 0;
2159         }
2160
2161         /* If the module may have a PHY but we didn't detect one we
2162          * need to configure the MAC here.
2163          */
2164         if (!pl->sfp_may_have_phy)
2165                 return 0;
2166
2167         return phylink_sfp_config(pl, MLO_AN_INBAND,
2168                                   pl->sfp_support, pl->sfp_support);
2169 }
2170
2171 static void phylink_sfp_module_stop(void *upstream)
2172 {
2173         struct phylink *pl = upstream;
2174
2175         /* If this SFP module has a PHY, stop it. */
2176         if (pl->phydev)
2177                 phy_stop(pl->phydev);
2178 }
2179
2180 static void phylink_sfp_link_down(void *upstream)
2181 {
2182         struct phylink *pl = upstream;
2183
2184         ASSERT_RTNL();
2185
2186         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
2187 }
2188
2189 static void phylink_sfp_link_up(void *upstream)
2190 {
2191         struct phylink *pl = upstream;
2192
2193         ASSERT_RTNL();
2194
2195         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
2196         phylink_run_resolve(pl);
2197 }
2198
2199 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
2200  * or 802.3z control word, so inband will not work.
2201  */
2202 static bool phylink_phy_no_inband(struct phy_device *phy)
2203 {
2204         return phy->is_c45 &&
2205                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
2206 }
2207
2208 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
2209 {
2210         struct phylink *pl = upstream;
2211         phy_interface_t interface;
2212         u8 mode;
2213         int ret;
2214
2215         /*
2216          * This is the new way of dealing with flow control for PHYs,
2217          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
2218          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
2219          * using our validate call to the MAC, we rely upon the MAC
2220          * clearing the bits from both supported and advertising fields.
2221          */
2222         phy_support_asym_pause(phy);
2223
2224         if (phylink_phy_no_inband(phy))
2225                 mode = MLO_AN_PHY;
2226         else
2227                 mode = MLO_AN_INBAND;
2228
2229         /* Do the initial configuration */
2230         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
2231         if (ret < 0)
2232                 return ret;
2233
2234         interface = pl->link_config.interface;
2235         ret = phylink_attach_phy(pl, phy, interface);
2236         if (ret < 0)
2237                 return ret;
2238
2239         ret = phylink_bringup_phy(pl, phy, interface);
2240         if (ret)
2241                 phy_detach(phy);
2242
2243         return ret;
2244 }
2245
2246 static void phylink_sfp_disconnect_phy(void *upstream)
2247 {
2248         phylink_disconnect_phy(upstream);
2249 }
2250
2251 static const struct sfp_upstream_ops sfp_phylink_ops = {
2252         .attach = phylink_sfp_attach,
2253         .detach = phylink_sfp_detach,
2254         .module_insert = phylink_sfp_module_insert,
2255         .module_start = phylink_sfp_module_start,
2256         .module_stop = phylink_sfp_module_stop,
2257         .link_up = phylink_sfp_link_up,
2258         .link_down = phylink_sfp_link_down,
2259         .connect_phy = phylink_sfp_connect_phy,
2260         .disconnect_phy = phylink_sfp_disconnect_phy,
2261 };
2262
2263 /* Helpers for MAC drivers */
2264
2265 /**
2266  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
2267  * @state: a pointer to a &struct phylink_link_state
2268  *
2269  * Inspect the interface mode, advertising mask or forced speed and
2270  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
2271  * the interface mode to suit.  @state->interface is appropriately
2272  * updated, and the advertising mask has the "other" baseX_Full flag
2273  * cleared.
2274  */
2275 void phylink_helper_basex_speed(struct phylink_link_state *state)
2276 {
2277         if (phy_interface_mode_is_8023z(state->interface)) {
2278                 bool want_2500 = state->an_enabled ?
2279                         phylink_test(state->advertising, 2500baseX_Full) :
2280                         state->speed == SPEED_2500;
2281
2282                 if (want_2500) {
2283                         phylink_clear(state->advertising, 1000baseX_Full);
2284                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
2285                 } else {
2286                         phylink_clear(state->advertising, 2500baseX_Full);
2287                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
2288                 }
2289         }
2290 }
2291 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
2292
2293 static void phylink_decode_c37_word(struct phylink_link_state *state,
2294                                     uint16_t config_reg, int speed)
2295 {
2296         bool tx_pause, rx_pause;
2297         int fd_bit;
2298
2299         if (speed == SPEED_2500)
2300                 fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
2301         else
2302                 fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
2303
2304         mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
2305
2306         if (linkmode_test_bit(fd_bit, state->advertising) &&
2307             linkmode_test_bit(fd_bit, state->lp_advertising)) {
2308                 state->speed = speed;
2309                 state->duplex = DUPLEX_FULL;
2310         } else {
2311                 /* negotiation failure */
2312                 state->link = false;
2313         }
2314
2315         linkmode_resolve_pause(state->advertising, state->lp_advertising,
2316                                &tx_pause, &rx_pause);
2317
2318         if (tx_pause)
2319                 state->pause |= MLO_PAUSE_TX;
2320         if (rx_pause)
2321                 state->pause |= MLO_PAUSE_RX;
2322 }
2323
2324 static void phylink_decode_sgmii_word(struct phylink_link_state *state,
2325                                       uint16_t config_reg)
2326 {
2327         if (!(config_reg & LPA_SGMII_LINK)) {
2328                 state->link = false;
2329                 return;
2330         }
2331
2332         switch (config_reg & LPA_SGMII_SPD_MASK) {
2333         case LPA_SGMII_10:
2334                 state->speed = SPEED_10;
2335                 break;
2336         case LPA_SGMII_100:
2337                 state->speed = SPEED_100;
2338                 break;
2339         case LPA_SGMII_1000:
2340                 state->speed = SPEED_1000;
2341                 break;
2342         default:
2343                 state->link = false;
2344                 return;
2345         }
2346         if (config_reg & LPA_SGMII_FULL_DUPLEX)
2347                 state->duplex = DUPLEX_FULL;
2348         else
2349                 state->duplex = DUPLEX_HALF;
2350 }
2351
2352 /**
2353  * phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
2354  * @state: a pointer to a struct phylink_link_state.
2355  * @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
2356  *
2357  * Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
2358  * code word.  Decode the USXGMII code word and populate the corresponding fields
2359  * (speed, duplex) into the phylink_link_state structure.
2360  */
2361 void phylink_decode_usxgmii_word(struct phylink_link_state *state,
2362                                  uint16_t lpa)
2363 {
2364         switch (lpa & MDIO_USXGMII_SPD_MASK) {
2365         case MDIO_USXGMII_10:
2366                 state->speed = SPEED_10;
2367                 break;
2368         case MDIO_USXGMII_100:
2369                 state->speed = SPEED_100;
2370                 break;
2371         case MDIO_USXGMII_1000:
2372                 state->speed = SPEED_1000;
2373                 break;
2374         case MDIO_USXGMII_2500:
2375                 state->speed = SPEED_2500;
2376                 break;
2377         case MDIO_USXGMII_5000:
2378                 state->speed = SPEED_5000;
2379                 break;
2380         case MDIO_USXGMII_10G:
2381                 state->speed = SPEED_10000;
2382                 break;
2383         default:
2384                 state->link = false;
2385                 return;
2386         }
2387
2388         if (lpa & MDIO_USXGMII_FULL_DUPLEX)
2389                 state->duplex = DUPLEX_FULL;
2390         else
2391                 state->duplex = DUPLEX_HALF;
2392 }
2393 EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
2394
2395 /**
2396  * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
2397  * @pcs: a pointer to a &struct mdio_device.
2398  * @state: a pointer to a &struct phylink_link_state.
2399  *
2400  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2401  * clause 37 negotiation and/or SGMII control.
2402  *
2403  * Read the MAC PCS state from the MII device configured in @config and
2404  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
2405  * the phylink @state structure. This is suitable to be directly plugged
2406  * into the mac_pcs_get_state() member of the struct phylink_mac_ops
2407  * structure.
2408  */
2409 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
2410                                    struct phylink_link_state *state)
2411 {
2412         struct mii_bus *bus = pcs->bus;
2413         int addr = pcs->addr;
2414         int bmsr, lpa;
2415
2416         bmsr = mdiobus_read(bus, addr, MII_BMSR);
2417         lpa = mdiobus_read(bus, addr, MII_LPA);
2418         if (bmsr < 0 || lpa < 0) {
2419                 state->link = false;
2420                 return;
2421         }
2422
2423         state->link = !!(bmsr & BMSR_LSTATUS);
2424         state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
2425         if (!state->link)
2426                 return;
2427
2428         switch (state->interface) {
2429         case PHY_INTERFACE_MODE_1000BASEX:
2430                 phylink_decode_c37_word(state, lpa, SPEED_1000);
2431                 break;
2432
2433         case PHY_INTERFACE_MODE_2500BASEX:
2434                 phylink_decode_c37_word(state, lpa, SPEED_2500);
2435                 break;
2436
2437         case PHY_INTERFACE_MODE_SGMII:
2438         case PHY_INTERFACE_MODE_QSGMII:
2439                 phylink_decode_sgmii_word(state, lpa);
2440                 break;
2441
2442         default:
2443                 state->link = false;
2444                 break;
2445         }
2446 }
2447 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
2448
2449 /**
2450  * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
2451  *      advertisement
2452  * @pcs: a pointer to a &struct mdio_device.
2453  * @interface: the PHY interface mode being configured
2454  * @advertising: the ethtool advertisement mask
2455  *
2456  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2457  * clause 37 negotiation and/or SGMII control.
2458  *
2459  * Configure the clause 37 PCS advertisement as specified by @state. This
2460  * does not trigger a renegotiation; phylink will do that via the
2461  * mac_an_restart() method of the struct phylink_mac_ops structure.
2462  *
2463  * Returns negative error code on failure to configure the advertisement,
2464  * zero if no change has been made, or one if the advertisement has changed.
2465  */
2466 int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
2467                                           phy_interface_t interface,
2468                                           const unsigned long *advertising)
2469 {
2470         struct mii_bus *bus = pcs->bus;
2471         int addr = pcs->addr;
2472         int val, ret;
2473         u16 adv;
2474
2475         switch (interface) {
2476         case PHY_INTERFACE_MODE_1000BASEX:
2477         case PHY_INTERFACE_MODE_2500BASEX:
2478                 adv = ADVERTISE_1000XFULL;
2479                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
2480                                       advertising))
2481                         adv |= ADVERTISE_1000XPAUSE;
2482                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
2483                                       advertising))
2484                         adv |= ADVERTISE_1000XPSE_ASYM;
2485
2486                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2487                 if (val < 0)
2488                         return val;
2489
2490                 if (val == adv)
2491                         return 0;
2492
2493                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
2494                 if (ret < 0)
2495                         return ret;
2496
2497                 return 1;
2498
2499         case PHY_INTERFACE_MODE_SGMII:
2500                 val = mdiobus_read(bus, addr, MII_ADVERTISE);
2501                 if (val < 0)
2502                         return val;
2503
2504                 if (val == 0x0001)
2505                         return 0;
2506
2507                 ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
2508                 if (ret < 0)
2509                         return ret;
2510
2511                 return 1;
2512
2513         default:
2514                 /* Nothing to do for other modes */
2515                 return 0;
2516         }
2517 }
2518 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);
2519
2520 /**
2521  * phylink_mii_c22_pcs_config() - configure clause 22 PCS
2522  * @pcs: a pointer to a &struct mdio_device.
2523  * @mode: link autonegotiation mode
2524  * @interface: the PHY interface mode being configured
2525  * @advertising: the ethtool advertisement mask
2526  *
2527  * Configure a Clause 22 PCS PHY with the appropriate negotiation
2528  * parameters for the @mode, @interface and @advertising parameters.
2529  * Returns negative error number on failure, zero if the advertisement
2530  * has not changed, or positive if there is a change.
2531  */
2532 int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
2533                                phy_interface_t interface,
2534                                const unsigned long *advertising)
2535 {
2536         bool changed;
2537         u16 bmcr;
2538         int ret;
2539
2540         ret = phylink_mii_c22_pcs_set_advertisement(pcs, interface,
2541                                                     advertising);
2542         if (ret < 0)
2543                 return ret;
2544
2545         changed = ret > 0;
2546
2547         /* Ensure ISOLATE bit is disabled */
2548         bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
2549         ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
2550                              BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
2551         if (ret < 0)
2552                 return ret;
2553
2554         return changed ? 1 : 0;
2555 }
2556 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
2557
2558 /**
2559  * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
2560  * @pcs: a pointer to a &struct mdio_device.
2561  *
2562  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2563  * clause 37 negotiation.
2564  *
2565  * Restart the clause 37 negotiation with the link partner. This is
2566  * suitable to be directly plugged into the mac_pcs_get_state() member
2567  * of the struct phylink_mac_ops structure.
2568  */
2569 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
2570 {
2571         struct mii_bus *bus = pcs->bus;
2572         int val, addr = pcs->addr;
2573
2574         val = mdiobus_read(bus, addr, MII_BMCR);
2575         if (val >= 0) {
2576                 val |= BMCR_ANRESTART;
2577
2578                 mdiobus_write(bus, addr, MII_BMCR, val);
2579         }
2580 }
2581 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
2582
2583 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
2584                                    struct phylink_link_state *state)
2585 {
2586         struct mii_bus *bus = pcs->bus;
2587         int addr = pcs->addr;
2588         int stat;
2589
2590         stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
2591         if (stat < 0) {
2592                 state->link = false;
2593                 return;
2594         }
2595
2596         state->link = !!(stat & MDIO_STAT1_LSTATUS);
2597         if (!state->link)
2598                 return;
2599
2600         switch (state->interface) {
2601         case PHY_INTERFACE_MODE_10GBASER:
2602                 state->speed = SPEED_10000;
2603                 state->duplex = DUPLEX_FULL;
2604                 break;
2605
2606         default:
2607                 break;
2608         }
2609 }
2610 EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);
2611
2612 MODULE_LICENSE("GPL v2");