drivers/net/mdio.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * mdio.c: Generic support for MDIO-compatible transceivers
0004  * Copyright 2006-2009 Solarflare Communications Inc.
0005  */
0006
0007 #include <linux/kernel.h>
0008 #include <linux/capability.h>
0009 #include <linux/errno.h>
0010 #include <linux/ethtool.h>
0011 #include <linux/mdio.h>
0012 #include <linux/module.h>
0013
0014 MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
0015 MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
0016 MODULE_LICENSE("GPL");
0017
0018 /**
0019  * mdio45_probe - probe for an MDIO (clause 45) device
0020  * @mdio: MDIO interface
0021  * @prtad: Expected PHY address
0022  *
0023  * This sets @prtad and @mmds in the MDIO interface if successful.
0024  * Returns 0 on success, negative on error.
0025  */
0026 int mdio45_probe(struct mdio_if_info *mdio, int prtad)
0027 {
0028     int mmd, stat2, devs1, devs2;
0029
0030     /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
0031      * XS or DTE XS; give up if none is present. */
0032     for (mmd = 1; mmd <= 5; mmd++) {
0033         /* Is this MMD present? */
0034         stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
0035         if (stat2 < 0 ||
0036             (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
0037             continue;
0038
0039         /* It should tell us about all the other MMDs */
0040         devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
0041         devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
0042         if (devs1 < 0 || devs2 < 0)
0043             continue;
0044
0045         mdio->prtad = prtad;
0046         mdio->mmds = devs1 | (devs2 << 16);
0047         return 0;
0048     }
0049
0050     return -ENODEV;
0051 }
0052 EXPORT_SYMBOL(mdio45_probe);
0053
0054 /**
0055  * mdio_set_flag - set or clear flag in an MDIO register
0056  * @mdio: MDIO interface
0057  * @prtad: PHY address
0058  * @devad: MMD address
0059  * @addr: Register address
0060  * @mask: Mask for flag (single bit set)
0061  * @sense: New value of flag
0062  *
0063  * This debounces changes: it does not write the register if the flag
0064  * already has the proper value.  Returns 0 on success, negative on error.
0065  */
0066 int mdio_set_flag(const struct mdio_if_info *mdio,
0067           int prtad, int devad, u16 addr, int mask,
0068           bool sense)
0069 {
0070     int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
0071     int new_val;
0072
0073     if (old_val < 0)
0074         return old_val;
0075     if (sense)
0076         new_val = old_val | mask;
0077     else
0078         new_val = old_val & ~mask;
0079     if (old_val == new_val)
0080         return 0;
0081     return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
0082 }
0083 EXPORT_SYMBOL(mdio_set_flag);
0084
0085 /**
0086  * mdio45_links_ok - is link status up/OK
0087  * @mdio: MDIO interface
0088  * @mmd_mask: Mask for MMDs to check
0089  *
0090  * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
0091  * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
0092  * the MMDs being bypassed should be excluded from the mask.
0093  */
0094 int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
0095 {
0096     int devad, reg;
0097
0098     if (!mmd_mask) {
0099         /* Use absence of XGMII faults in lieu of link state */
0100         reg = mdio->mdio_read(mdio->dev, mdio->prtad,
0101                       MDIO_MMD_PHYXS, MDIO_STAT2);
0102         return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
0103     }
0104
0105     for (devad = 0; mmd_mask; devad++) {
0106         if (mmd_mask & (1 << devad)) {
0107             mmd_mask &= ~(1 << devad);
0108
0109             /* Reset the latched status and fault flags */
0110             mdio->mdio_read(mdio->dev, mdio->prtad,
0111                     devad, MDIO_STAT1);
0112             if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
0113                 devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
0114                 mdio->mdio_read(mdio->dev, mdio->prtad,
0115                         devad, MDIO_STAT2);
0116
0117             /* Check the current status and fault flags */
0118             reg = mdio->mdio_read(mdio->dev, mdio->prtad,
0119                           devad, MDIO_STAT1);
0120             if (reg < 0 ||
0121                 (reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
0122                 MDIO_STAT1_LSTATUS)
0123                 return false;
0124         }
0125     }
0126
0127     return true;
0128 }
0129 EXPORT_SYMBOL(mdio45_links_ok);
0130
0131 /**
0132  * mdio45_nway_restart - restart auto-negotiation for this interface
0133  * @mdio: MDIO interface
0134  *
0135  * Returns 0 on success, negative on error.
0136  */
0137 int mdio45_nway_restart(const struct mdio_if_info *mdio)
0138 {
0139     if (!(mdio->mmds & MDIO_DEVS_AN))
0140         return -EOPNOTSUPP;
0141
0142     mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
0143               MDIO_AN_CTRL1_RESTART, true);
0144     return 0;
0145 }
0146 EXPORT_SYMBOL(mdio45_nway_restart);
0147
0148 static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
0149 {
0150     u32 result = 0;
0151     int reg;
0152
0153     reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
0154     if (reg & ADVERTISE_10HALF)
0155         result |= ADVERTISED_10baseT_Half;
0156     if (reg & ADVERTISE_10FULL)
0157         result |= ADVERTISED_10baseT_Full;
0158     if (reg & ADVERTISE_100HALF)
0159         result |= ADVERTISED_100baseT_Half;
0160     if (reg & ADVERTISE_100FULL)
0161         result |= ADVERTISED_100baseT_Full;
0162     if (reg & ADVERTISE_PAUSE_CAP)
0163         result |= ADVERTISED_Pause;
0164     if (reg & ADVERTISE_PAUSE_ASYM)
0165         result |= ADVERTISED_Asym_Pause;
0166     return result;
0167 }
0168
0169 /**
0170  * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
0171  * @mdio: MDIO interface
0172  * @ecmd: Ethtool request structure
0173  * @npage_adv: Modes currently advertised on next pages
0174  * @npage_lpa: Modes advertised by link partner on next pages
0175  *
0176  * The @ecmd parameter is expected to have been cleared before calling
0177  * mdio45_ethtool_gset_npage().
0178  *
0179  * Since the CSRs for auto-negotiation using next pages are not fully
0180  * standardised, this function does not attempt to decode them.  The
0181  * caller must pass them in.
0182  */
0183 void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
0184                    struct ethtool_cmd *ecmd,
0185                    u32 npage_adv, u32 npage_lpa)
0186 {
0187     int reg;
0188     u32 speed;
0189
0190     BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
0191     BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
0192
0193     ecmd->transceiver = XCVR_INTERNAL;
0194     ecmd->phy_address = mdio->prtad;
0195     ecmd->mdio_support =
0196         mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
0197
0198     reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0199                   MDIO_CTRL2);
0200     switch (reg & MDIO_PMA_CTRL2_TYPE) {
0201     case MDIO_PMA_CTRL2_10GBT:
0202     case MDIO_PMA_CTRL2_1000BT:
0203     case MDIO_PMA_CTRL2_100BTX:
0204     case MDIO_PMA_CTRL2_10BT:
0205         ecmd->port = PORT_TP;
0206         ecmd->supported = SUPPORTED_TP;
0207         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0208                       MDIO_SPEED);
0209         if (reg & MDIO_SPEED_10G)
0210             ecmd->supported |= SUPPORTED_10000baseT_Full;
0211         if (reg & MDIO_PMA_SPEED_1000)
0212             ecmd->supported |= (SUPPORTED_1000baseT_Full |
0213                         SUPPORTED_1000baseT_Half);
0214         if (reg & MDIO_PMA_SPEED_100)
0215             ecmd->supported |= (SUPPORTED_100baseT_Full |
0216                         SUPPORTED_100baseT_Half);
0217         if (reg & MDIO_PMA_SPEED_10)
0218             ecmd->supported |= (SUPPORTED_10baseT_Full |
0219                         SUPPORTED_10baseT_Half);
0220         ecmd->advertising = ADVERTISED_TP;
0221         break;
0222
0223     case MDIO_PMA_CTRL2_10GBCX4:
0224         ecmd->port = PORT_OTHER;
0225         ecmd->supported = 0;
0226         ecmd->advertising = 0;
0227         break;
0228
0229     case MDIO_PMA_CTRL2_10GBKX4:
0230     case MDIO_PMA_CTRL2_10GBKR:
0231     case MDIO_PMA_CTRL2_1000BKX:
0232         ecmd->port = PORT_OTHER;
0233         ecmd->supported = SUPPORTED_Backplane;
0234         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0235                       MDIO_PMA_EXTABLE);
0236         if (reg & MDIO_PMA_EXTABLE_10GBKX4)
0237             ecmd->supported |= SUPPORTED_10000baseKX4_Full;
0238         if (reg & MDIO_PMA_EXTABLE_10GBKR)
0239             ecmd->supported |= SUPPORTED_10000baseKR_Full;
0240         if (reg & MDIO_PMA_EXTABLE_1000BKX)
0241             ecmd->supported |= SUPPORTED_1000baseKX_Full;
0242         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0243                       MDIO_PMA_10GBR_FECABLE);
0244         if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
0245             ecmd->supported |= SUPPORTED_10000baseR_FEC;
0246         ecmd->advertising = ADVERTISED_Backplane;
0247         break;
0248
0249     /* All the other defined modes are flavours of optical */
0250     default:
0251         ecmd->port = PORT_FIBRE;
0252         ecmd->supported = SUPPORTED_FIBRE;
0253         ecmd->advertising = ADVERTISED_FIBRE;
0254         break;
0255     }
0256
0257     if (mdio->mmds & MDIO_DEVS_AN) {
0258         ecmd->supported |= SUPPORTED_Autoneg;
0259         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
0260                       MDIO_CTRL1);
0261         if (reg & MDIO_AN_CTRL1_ENABLE) {
0262             ecmd->autoneg = AUTONEG_ENABLE;
0263             ecmd->advertising |=
0264                 ADVERTISED_Autoneg |
0265                 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
0266                 npage_adv;
0267         } else {
0268             ecmd->autoneg = AUTONEG_DISABLE;
0269         }
0270     } else {
0271         ecmd->autoneg = AUTONEG_DISABLE;
0272     }
0273
0274     if (ecmd->autoneg) {
0275         u32 modes = 0;
0276         int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
0277                           MDIO_MMD_AN, MDIO_STAT1);
0278
0279         /* If AN is complete and successful, report best common
0280          * mode, otherwise report best advertised mode. */
0281         if (an_stat & MDIO_AN_STAT1_COMPLETE) {
0282             ecmd->lp_advertising =
0283                 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
0284             if (an_stat & MDIO_AN_STAT1_LPABLE)
0285                 ecmd->lp_advertising |= ADVERTISED_Autoneg;
0286             modes = ecmd->advertising & ecmd->lp_advertising;
0287         }
0288         if ((modes & ~ADVERTISED_Autoneg) == 0)
0289             modes = ecmd->advertising;
0290
0291         if (modes & (ADVERTISED_10000baseT_Full |
0292                  ADVERTISED_10000baseKX4_Full |
0293                  ADVERTISED_10000baseKR_Full)) {
0294             speed = SPEED_10000;
0295             ecmd->duplex = DUPLEX_FULL;
0296         } else if (modes & (ADVERTISED_1000baseT_Full |
0297                     ADVERTISED_1000baseT_Half |
0298                     ADVERTISED_1000baseKX_Full)) {
0299             speed = SPEED_1000;
0300             ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
0301         } else if (modes & (ADVERTISED_100baseT_Full |
0302                     ADVERTISED_100baseT_Half)) {
0303             speed = SPEED_100;
0304             ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
0305         } else {
0306             speed = SPEED_10;
0307             ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
0308         }
0309     } else {
0310         /* Report forced settings */
0311         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0312                       MDIO_CTRL1);
0313         speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
0314              * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
0315         ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
0316                 speed == SPEED_10000);
0317     }
0318
0319     ethtool_cmd_speed_set(ecmd, speed);
0320
0321     /* 10GBASE-T MDI/MDI-X */
0322     if (ecmd->port == PORT_TP
0323         && (ethtool_cmd_speed(ecmd) == SPEED_10000)) {
0324         switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0325                     MDIO_PMA_10GBT_SWAPPOL)) {
0326         case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
0327             ecmd->eth_tp_mdix = ETH_TP_MDI;
0328             break;
0329         case 0:
0330             ecmd->eth_tp_mdix = ETH_TP_MDI_X;
0331             break;
0332         default:
0333             /* It's complicated... */
0334             ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
0335             break;
0336         }
0337     }
0338 }
0339 EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
0340
0341 /**
0342  * mdio45_ethtool_ksettings_get_npage - get settings for ETHTOOL_GLINKSETTINGS
0343  * @mdio: MDIO interface
0344  * @cmd: Ethtool request structure
0345  * @npage_adv: Modes currently advertised on next pages
0346  * @npage_lpa: Modes advertised by link partner on next pages
0347  *
0348  * The @cmd parameter is expected to have been cleared before calling
0349  * mdio45_ethtool_ksettings_get_npage().
0350  *
0351  * Since the CSRs for auto-negotiation using next pages are not fully
0352  * standardised, this function does not attempt to decode them.  The
0353  * caller must pass them in.
0354  */
0355 void mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
0356                     struct ethtool_link_ksettings *cmd,
0357                     u32 npage_adv, u32 npage_lpa)
0358 {
0359     int reg;
0360     u32 speed, supported = 0, advertising = 0, lp_advertising = 0;
0361
0362     BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
0363     BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
0364
0365     cmd->base.phy_address = mdio->prtad;
0366     cmd->base.mdio_support =
0367         mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
0368
0369     reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0370                   MDIO_CTRL2);
0371     switch (reg & MDIO_PMA_CTRL2_TYPE) {
0372     case MDIO_PMA_CTRL2_10GBT:
0373     case MDIO_PMA_CTRL2_1000BT:
0374     case MDIO_PMA_CTRL2_100BTX:
0375     case MDIO_PMA_CTRL2_10BT:
0376         cmd->base.port = PORT_TP;
0377         supported = SUPPORTED_TP;
0378         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0379                       MDIO_SPEED);
0380         if (reg & MDIO_SPEED_10G)
0381             supported |= SUPPORTED_10000baseT_Full;
0382         if (reg & MDIO_PMA_SPEED_1000)
0383             supported |= (SUPPORTED_1000baseT_Full |
0384                         SUPPORTED_1000baseT_Half);
0385         if (reg & MDIO_PMA_SPEED_100)
0386             supported |= (SUPPORTED_100baseT_Full |
0387                         SUPPORTED_100baseT_Half);
0388         if (reg & MDIO_PMA_SPEED_10)
0389             supported |= (SUPPORTED_10baseT_Full |
0390                         SUPPORTED_10baseT_Half);
0391         advertising = ADVERTISED_TP;
0392         break;
0393
0394     case MDIO_PMA_CTRL2_10GBCX4:
0395         cmd->base.port = PORT_OTHER;
0396         supported = 0;
0397         advertising = 0;
0398         break;
0399
0400     case MDIO_PMA_CTRL2_10GBKX4:
0401     case MDIO_PMA_CTRL2_10GBKR:
0402     case MDIO_PMA_CTRL2_1000BKX:
0403         cmd->base.port = PORT_OTHER;
0404         supported = SUPPORTED_Backplane;
0405         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0406                       MDIO_PMA_EXTABLE);
0407         if (reg & MDIO_PMA_EXTABLE_10GBKX4)
0408             supported |= SUPPORTED_10000baseKX4_Full;
0409         if (reg & MDIO_PMA_EXTABLE_10GBKR)
0410             supported |= SUPPORTED_10000baseKR_Full;
0411         if (reg & MDIO_PMA_EXTABLE_1000BKX)
0412             supported |= SUPPORTED_1000baseKX_Full;
0413         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0414                       MDIO_PMA_10GBR_FECABLE);
0415         if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
0416             supported |= SUPPORTED_10000baseR_FEC;
0417         advertising = ADVERTISED_Backplane;
0418         break;
0419
0420     /* All the other defined modes are flavours of optical */
0421     default:
0422         cmd->base.port = PORT_FIBRE;
0423         supported = SUPPORTED_FIBRE;
0424         advertising = ADVERTISED_FIBRE;
0425         break;
0426     }
0427
0428     if (mdio->mmds & MDIO_DEVS_AN) {
0429         supported |= SUPPORTED_Autoneg;
0430         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
0431                       MDIO_CTRL1);
0432         if (reg & MDIO_AN_CTRL1_ENABLE) {
0433             cmd->base.autoneg = AUTONEG_ENABLE;
0434             advertising |=
0435                 ADVERTISED_Autoneg |
0436                 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
0437                 npage_adv;
0438         } else {
0439             cmd->base.autoneg = AUTONEG_DISABLE;
0440         }
0441     } else {
0442         cmd->base.autoneg = AUTONEG_DISABLE;
0443     }
0444
0445     if (cmd->base.autoneg) {
0446         u32 modes = 0;
0447         int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
0448                           MDIO_MMD_AN, MDIO_STAT1);
0449
0450         /* If AN is complete and successful, report best common
0451          * mode, otherwise report best advertised mode.
0452          */
0453         if (an_stat & MDIO_AN_STAT1_COMPLETE) {
0454             lp_advertising =
0455                 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
0456             if (an_stat & MDIO_AN_STAT1_LPABLE)
0457                 lp_advertising |= ADVERTISED_Autoneg;
0458             modes = advertising & lp_advertising;
0459         }
0460         if ((modes & ~ADVERTISED_Autoneg) == 0)
0461             modes = advertising;
0462
0463         if (modes & (ADVERTISED_10000baseT_Full |
0464                  ADVERTISED_10000baseKX4_Full |
0465                  ADVERTISED_10000baseKR_Full)) {
0466             speed = SPEED_10000;
0467             cmd->base.duplex = DUPLEX_FULL;
0468         } else if (modes & (ADVERTISED_1000baseT_Full |
0469                     ADVERTISED_1000baseT_Half |
0470                     ADVERTISED_1000baseKX_Full)) {
0471             speed = SPEED_1000;
0472             cmd->base.duplex = !(modes & ADVERTISED_1000baseT_Half);
0473         } else if (modes & (ADVERTISED_100baseT_Full |
0474                     ADVERTISED_100baseT_Half)) {
0475             speed = SPEED_100;
0476             cmd->base.duplex = !!(modes & ADVERTISED_100baseT_Full);
0477         } else {
0478             speed = SPEED_10;
0479             cmd->base.duplex = !!(modes & ADVERTISED_10baseT_Full);
0480         }
0481     } else {
0482         /* Report forced settings */
0483         reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0484                       MDIO_CTRL1);
0485         speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
0486              * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
0487         cmd->base.duplex = (reg & MDIO_CTRL1_FULLDPLX ||
0488                     speed == SPEED_10000);
0489     }
0490
0491     cmd->base.speed = speed;
0492
0493     ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
0494                         supported);
0495     ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
0496                         advertising);
0497     ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
0498                         lp_advertising);
0499
0500     /* 10GBASE-T MDI/MDI-X */
0501     if (cmd->base.port == PORT_TP && (cmd->base.speed == SPEED_10000)) {
0502         switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
0503                     MDIO_PMA_10GBT_SWAPPOL)) {
0504         case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
0505             cmd->base.eth_tp_mdix = ETH_TP_MDI;
0506             break;
0507         case 0:
0508             cmd->base.eth_tp_mdix = ETH_TP_MDI_X;
0509             break;
0510         default:
0511             /* It's complicated... */
0512             cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
0513             break;
0514         }
0515     }
0516 }
0517 EXPORT_SYMBOL(mdio45_ethtool_ksettings_get_npage);
0518
0519 /**
0520  * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
0521  * @mdio: MDIO interface
0522  * @mii_data: MII ioctl data structure
0523  * @cmd: MII ioctl command
0524  *
0525  * Returns 0 on success, negative on error.
0526  */
0527 int mdio_mii_ioctl(const struct mdio_if_info *mdio,
0528            struct mii_ioctl_data *mii_data, int cmd)
0529 {
0530     int prtad, devad;
0531     u16 addr = mii_data->reg_num;
0532
0533     /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
0534     switch (cmd) {
0535     case SIOCGMIIPHY:
0536         if (mdio->prtad == MDIO_PRTAD_NONE)
0537             return -EOPNOTSUPP;
0538         mii_data->phy_id = mdio->prtad;
0539         cmd = SIOCGMIIREG;
0540         break;
0541     case SIOCGMIIREG:
0542     case SIOCSMIIREG:
0543         break;
0544     default:
0545         return -EOPNOTSUPP;
0546     }
0547
0548     /* Validate/convert phy_id */
0549     if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
0550         mdio_phy_id_is_c45(mii_data->phy_id)) {
0551         prtad = mdio_phy_id_prtad(mii_data->phy_id);
0552         devad = mdio_phy_id_devad(mii_data->phy_id);
0553     } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
0554            mii_data->phy_id < 0x20) {
0555         prtad = mii_data->phy_id;
0556         devad = MDIO_DEVAD_NONE;
0557         addr &= 0x1f;
0558     } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
0559            mdio->prtad != MDIO_PRTAD_NONE &&
0560            mii_data->phy_id == mdio->prtad) {
0561         /* Remap commonly-used MII registers. */
0562         prtad = mdio->prtad;
0563         switch (addr) {
0564         case MII_BMCR:
0565         case MII_BMSR:
0566         case MII_PHYSID1:
0567         case MII_PHYSID2:
0568             devad = __ffs(mdio->mmds);
0569             break;
0570         case MII_ADVERTISE:
0571         case MII_LPA:
0572             if (!(mdio->mmds & MDIO_DEVS_AN))
0573                 return -EINVAL;
0574             devad = MDIO_MMD_AN;
0575             if (addr == MII_ADVERTISE)
0576                 addr = MDIO_AN_ADVERTISE;
0577             else
0578                 addr = MDIO_AN_LPA;
0579             break;
0580         default:
0581             return -EINVAL;
0582         }
0583     } else {
0584         return -EINVAL;
0585     }
0586
0587     if (cmd == SIOCGMIIREG) {
0588         int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
0589         if (rc < 0)
0590             return rc;
0591         mii_data->val_out = rc;
0592         return 0;
0593     } else {
0594         return mdio->mdio_write(mdio->dev, prtad, devad, addr,
0595                     mii_data->val_in);
0596     }
0597 }
0598 EXPORT_SYMBOL(mdio_mii_ioctl);