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