linux/drivers/net/mdio.c
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   1/*
   2 * mdio.c: Generic support for MDIO-compatible transceivers
   3 * Copyright 2006-2009 Solarflare Communications Inc.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of the GNU General Public License version 2 as published
   7 * by the Free Software Foundation, incorporated herein by reference.
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/capability.h>
  12#include <linux/errno.h>
  13#include <linux/ethtool.h>
  14#include <linux/mdio.h>
  15#include <linux/module.h>
  16
  17MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
  18MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
  19MODULE_LICENSE("GPL");
  20
  21/**
  22 * mdio45_probe - probe for an MDIO (clause 45) device
  23 * @mdio: MDIO interface
  24 * @prtad: Expected PHY address
  25 *
  26 * This sets @prtad and @mmds in the MDIO interface if successful.
  27 * Returns 0 on success, negative on error.
  28 */
  29int mdio45_probe(struct mdio_if_info *mdio, int prtad)
  30{
  31        int mmd, stat2, devs1, devs2;
  32
  33        /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
  34         * XS or DTE XS; give up if none is present. */
  35        for (mmd = 1; mmd <= 5; mmd++) {
  36                /* Is this MMD present? */
  37                stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
  38                if (stat2 < 0 ||
  39                    (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
  40                        continue;
  41
  42                /* It should tell us about all the other MMDs */
  43                devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
  44                devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
  45                if (devs1 < 0 || devs2 < 0)
  46                        continue;
  47
  48                mdio->prtad = prtad;
  49                mdio->mmds = devs1 | (devs2 << 16);
  50                return 0;
  51        }
  52
  53        return -ENODEV;
  54}
  55EXPORT_SYMBOL(mdio45_probe);
  56
  57/**
  58 * mdio_set_flag - set or clear flag in an MDIO register
  59 * @mdio: MDIO interface
  60 * @prtad: PHY address
  61 * @devad: MMD address
  62 * @addr: Register address
  63 * @mask: Mask for flag (single bit set)
  64 * @sense: New value of flag
  65 *
  66 * This debounces changes: it does not write the register if the flag
  67 * already has the proper value.  Returns 0 on success, negative on error.
  68 */
  69int mdio_set_flag(const struct mdio_if_info *mdio,
  70                  int prtad, int devad, u16 addr, int mask,
  71                  bool sense)
  72{
  73        int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
  74        int new_val;
  75
  76        if (old_val < 0)
  77                return old_val;
  78        if (sense)
  79                new_val = old_val | mask;
  80        else
  81                new_val = old_val & ~mask;
  82        if (old_val == new_val)
  83                return 0;
  84        return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
  85}
  86EXPORT_SYMBOL(mdio_set_flag);
  87
  88/**
  89 * mdio_link_ok - is link status up/OK
  90 * @mdio: MDIO interface
  91 * @mmd_mask: Mask for MMDs to check
  92 *
  93 * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
  94 * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
  95 * the MMDs being bypassed should be excluded from the mask.
  96 */
  97int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
  98{
  99        int devad, reg;
 100
 101        if (!mmd_mask) {
 102                /* Use absence of XGMII faults in lieu of link state */
 103                reg = mdio->mdio_read(mdio->dev, mdio->prtad,
 104                                      MDIO_MMD_PHYXS, MDIO_STAT2);
 105                return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
 106        }
 107
 108        for (devad = 0; mmd_mask; devad++) {
 109                if (mmd_mask & (1 << devad)) {
 110                        mmd_mask &= ~(1 << devad);
 111
 112                        /* Reset the latched status and fault flags */
 113                        mdio->mdio_read(mdio->dev, mdio->prtad,
 114                                        devad, MDIO_STAT1);
 115                        if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
 116                            devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
 117                                mdio->mdio_read(mdio->dev, mdio->prtad,
 118                                                devad, MDIO_STAT2);
 119
 120                        /* Check the current status and fault flags */
 121                        reg = mdio->mdio_read(mdio->dev, mdio->prtad,
 122                                              devad, MDIO_STAT1);
 123                        if (reg < 0 ||
 124                            (reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
 125                            MDIO_STAT1_LSTATUS)
 126                                return false;
 127                }
 128        }
 129
 130        return true;
 131}
 132EXPORT_SYMBOL(mdio45_links_ok);
 133
 134/**
 135 * mdio45_nway_restart - restart auto-negotiation for this interface
 136 * @mdio: MDIO interface
 137 *
 138 * Returns 0 on success, negative on error.
 139 */
 140int mdio45_nway_restart(const struct mdio_if_info *mdio)
 141{
 142        if (!(mdio->mmds & MDIO_DEVS_AN))
 143                return -EOPNOTSUPP;
 144
 145        mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
 146                      MDIO_AN_CTRL1_RESTART, true);
 147        return 0;
 148}
 149EXPORT_SYMBOL(mdio45_nway_restart);
 150
 151static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
 152{
 153        u32 result = 0;
 154        int reg;
 155
 156        reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
 157        if (reg & ADVERTISE_10HALF)
 158                result |= ADVERTISED_10baseT_Half;
 159        if (reg & ADVERTISE_10FULL)
 160                result |= ADVERTISED_10baseT_Full;
 161        if (reg & ADVERTISE_100HALF)
 162                result |= ADVERTISED_100baseT_Half;
 163        if (reg & ADVERTISE_100FULL)
 164                result |= ADVERTISED_100baseT_Full;
 165        if (reg & ADVERTISE_PAUSE_CAP)
 166                result |= ADVERTISED_Pause;
 167        if (reg & ADVERTISE_PAUSE_ASYM)
 168                result |= ADVERTISED_Asym_Pause;
 169        return result;
 170}
 171
 172/**
 173 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
 174 * @mdio: MDIO interface
 175 * @ecmd: Ethtool request structure
 176 * @npage_adv: Modes currently advertised on next pages
 177 * @npage_lpa: Modes advertised by link partner on next pages
 178 *
 179 * The @ecmd parameter is expected to have been cleared before calling
 180 * mdio45_ethtool_gset_npage().
 181 *
 182 * Since the CSRs for auto-negotiation using next pages are not fully
 183 * standardised, this function does not attempt to decode them.  The
 184 * caller must pass them in.
 185 */
 186void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 187                               struct ethtool_cmd *ecmd,
 188                               u32 npage_adv, u32 npage_lpa)
 189{
 190        int reg;
 191        u32 speed;
 192
 193        BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
 194        BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
 195
 196        ecmd->transceiver = XCVR_INTERNAL;
 197        ecmd->phy_address = mdio->prtad;
 198        ecmd->mdio_support =
 199                mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
 200
 201        reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 202                              MDIO_CTRL2);
 203        switch (reg & MDIO_PMA_CTRL2_TYPE) {
 204        case MDIO_PMA_CTRL2_10GBT:
 205        case MDIO_PMA_CTRL2_1000BT:
 206        case MDIO_PMA_CTRL2_100BTX:
 207        case MDIO_PMA_CTRL2_10BT:
 208                ecmd->port = PORT_TP;
 209                ecmd->supported = SUPPORTED_TP;
 210                reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 211                                      MDIO_SPEED);
 212                if (reg & MDIO_SPEED_10G)
 213                        ecmd->supported |= SUPPORTED_10000baseT_Full;
 214                if (reg & MDIO_PMA_SPEED_1000)
 215                        ecmd->supported |= (SUPPORTED_1000baseT_Full |
 216                                            SUPPORTED_1000baseT_Half);
 217                if (reg & MDIO_PMA_SPEED_100)
 218                        ecmd->supported |= (SUPPORTED_100baseT_Full |
 219                                            SUPPORTED_100baseT_Half);
 220                if (reg & MDIO_PMA_SPEED_10)
 221                        ecmd->supported |= (SUPPORTED_10baseT_Full |
 222                                            SUPPORTED_10baseT_Half);
 223                ecmd->advertising = ADVERTISED_TP;
 224                break;
 225
 226        case MDIO_PMA_CTRL2_10GBCX4:
 227                ecmd->port = PORT_OTHER;
 228                ecmd->supported = 0;
 229                ecmd->advertising = 0;
 230                break;
 231
 232        case MDIO_PMA_CTRL2_10GBKX4:
 233        case MDIO_PMA_CTRL2_10GBKR:
 234        case MDIO_PMA_CTRL2_1000BKX:
 235                ecmd->port = PORT_OTHER;
 236                ecmd->supported = SUPPORTED_Backplane;
 237                reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 238                                      MDIO_PMA_EXTABLE);
 239                if (reg & MDIO_PMA_EXTABLE_10GBKX4)
 240                        ecmd->supported |= SUPPORTED_10000baseKX4_Full;
 241                if (reg & MDIO_PMA_EXTABLE_10GBKR)
 242                        ecmd->supported |= SUPPORTED_10000baseKR_Full;
 243                if (reg & MDIO_PMA_EXTABLE_1000BKX)
 244                        ecmd->supported |= SUPPORTED_1000baseKX_Full;
 245                reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 246                                      MDIO_PMA_10GBR_FECABLE);
 247                if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
 248                        ecmd->supported |= SUPPORTED_10000baseR_FEC;
 249                ecmd->advertising = ADVERTISED_Backplane;
 250                break;
 251
 252        /* All the other defined modes are flavours of optical */
 253        default:
 254                ecmd->port = PORT_FIBRE;
 255                ecmd->supported = SUPPORTED_FIBRE;
 256                ecmd->advertising = ADVERTISED_FIBRE;
 257                break;
 258        }
 259
 260        if (mdio->mmds & MDIO_DEVS_AN) {
 261                ecmd->supported |= SUPPORTED_Autoneg;
 262                reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
 263                                      MDIO_CTRL1);
 264                if (reg & MDIO_AN_CTRL1_ENABLE) {
 265                        ecmd->autoneg = AUTONEG_ENABLE;
 266                        ecmd->advertising |=
 267                                ADVERTISED_Autoneg |
 268                                mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
 269                                npage_adv;
 270                } else {
 271                        ecmd->autoneg = AUTONEG_DISABLE;
 272                }
 273        } else {
 274                ecmd->autoneg = AUTONEG_DISABLE;
 275        }
 276
 277        if (ecmd->autoneg) {
 278                u32 modes = 0;
 279                int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
 280                                              MDIO_MMD_AN, MDIO_STAT1);
 281
 282                /* If AN is complete and successful, report best common
 283                 * mode, otherwise report best advertised mode. */
 284                if (an_stat & MDIO_AN_STAT1_COMPLETE) {
 285                        ecmd->lp_advertising =
 286                                mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
 287                        if (an_stat & MDIO_AN_STAT1_LPABLE)
 288                                ecmd->lp_advertising |= ADVERTISED_Autoneg;
 289                        modes = ecmd->advertising & ecmd->lp_advertising;
 290                }
 291                if ((modes & ~ADVERTISED_Autoneg) == 0)
 292                        modes = ecmd->advertising;
 293
 294                if (modes & (ADVERTISED_10000baseT_Full |
 295                             ADVERTISED_10000baseKX4_Full |
 296                             ADVERTISED_10000baseKR_Full)) {
 297                        speed = SPEED_10000;
 298                        ecmd->duplex = DUPLEX_FULL;
 299                } else if (modes & (ADVERTISED_1000baseT_Full |
 300                                    ADVERTISED_1000baseT_Half |
 301                                    ADVERTISED_1000baseKX_Full)) {
 302                        speed = SPEED_1000;
 303                        ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
 304                } else if (modes & (ADVERTISED_100baseT_Full |
 305                                    ADVERTISED_100baseT_Half)) {
 306                        speed = SPEED_100;
 307                        ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
 308                } else {
 309                        speed = SPEED_10;
 310                        ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
 311                }
 312        } else {
 313                /* Report forced settings */
 314                reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 315                                      MDIO_CTRL1);
 316                speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
 317                         * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
 318                ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
 319                                speed == SPEED_10000);
 320        }
 321
 322        ethtool_cmd_speed_set(ecmd, speed);
 323
 324        /* 10GBASE-T MDI/MDI-X */
 325        if (ecmd->port == PORT_TP
 326            && (ethtool_cmd_speed(ecmd) == SPEED_10000)) {
 327                switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 328                                        MDIO_PMA_10GBT_SWAPPOL)) {
 329                case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
 330                        ecmd->eth_tp_mdix = ETH_TP_MDI;
 331                        break;
 332                case 0:
 333                        ecmd->eth_tp_mdix = ETH_TP_MDI_X;
 334                        break;
 335                default:
 336                        /* It's complicated... */
 337                        ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
 338                        break;
 339                }
 340        }
 341}
 342EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
 343
 344/**
 345 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters
 346 * @mdio: MDIO interface
 347 * @ecmd: Ethtool request structure
 348 *
 349 * This function assumes that the PHY has an auto-negotiation MMD.  It
 350 * will enable and disable advertising of flow control as appropriate.
 351 */
 352void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio,
 353                                   const struct ethtool_pauseparam *ecmd)
 354{
 355        int adv, old_adv;
 356
 357        WARN_ON(!(mdio->mmds & MDIO_DEVS_AN));
 358
 359        old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
 360                                  MDIO_AN_ADVERTISE);
 361        adv = ((old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) |
 362               mii_advertise_flowctrl((ecmd->rx_pause ? FLOW_CTRL_RX : 0) |
 363                                      (ecmd->tx_pause ? FLOW_CTRL_TX : 0)));
 364        if (adv != old_adv) {
 365                mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN,
 366                                 MDIO_AN_ADVERTISE, adv);
 367                mdio45_nway_restart(mdio);
 368        }
 369}
 370EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an);
 371
 372/**
 373 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
 374 * @mdio: MDIO interface
 375 * @mii_data: MII ioctl data structure
 376 * @cmd: MII ioctl command
 377 *
 378 * Returns 0 on success, negative on error.
 379 */
 380int mdio_mii_ioctl(const struct mdio_if_info *mdio,
 381                   struct mii_ioctl_data *mii_data, int cmd)
 382{
 383        int prtad, devad;
 384        u16 addr = mii_data->reg_num;
 385
 386        /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
 387        switch (cmd) {
 388        case SIOCGMIIPHY:
 389                if (mdio->prtad == MDIO_PRTAD_NONE)
 390                        return -EOPNOTSUPP;
 391                mii_data->phy_id = mdio->prtad;
 392                cmd = SIOCGMIIREG;
 393                break;
 394        case SIOCGMIIREG:
 395        case SIOCSMIIREG:
 396                break;
 397        default:
 398                return -EOPNOTSUPP;
 399        }
 400
 401        /* Validate/convert phy_id */
 402        if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
 403            mdio_phy_id_is_c45(mii_data->phy_id)) {
 404                prtad = mdio_phy_id_prtad(mii_data->phy_id);
 405                devad = mdio_phy_id_devad(mii_data->phy_id);
 406        } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
 407                   mii_data->phy_id < 0x20) {
 408                prtad = mii_data->phy_id;
 409                devad = MDIO_DEVAD_NONE;
 410                addr &= 0x1f;
 411        } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
 412                   mdio->prtad != MDIO_PRTAD_NONE &&
 413                   mii_data->phy_id == mdio->prtad) {
 414                /* Remap commonly-used MII registers. */
 415                prtad = mdio->prtad;
 416                switch (addr) {
 417                case MII_BMCR:
 418                case MII_BMSR:
 419                case MII_PHYSID1:
 420                case MII_PHYSID2:
 421                        devad = __ffs(mdio->mmds);
 422                        break;
 423                case MII_ADVERTISE:
 424                case MII_LPA:
 425                        if (!(mdio->mmds & MDIO_DEVS_AN))
 426                                return -EINVAL;
 427                        devad = MDIO_MMD_AN;
 428                        if (addr == MII_ADVERTISE)
 429                                addr = MDIO_AN_ADVERTISE;
 430                        else
 431                                addr = MDIO_AN_LPA;
 432                        break;
 433                default:
 434                        return -EINVAL;
 435                }
 436        } else {
 437                return -EINVAL;
 438        }
 439
 440        if (cmd == SIOCGMIIREG) {
 441                int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
 442                if (rc < 0)
 443                        return rc;
 444                mii_data->val_out = rc;
 445                return 0;
 446        } else {
 447                return mdio->mdio_write(mdio->dev, prtad, devad, addr,
 448                                        mii_data->val_in);
 449        }
 450}
 451EXPORT_SYMBOL(mdio_mii_ioctl);
 452
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