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 MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers"); 18 MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc."); 19 MODULE_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 */ 29 int 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 } 55 EXPORT_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 */ 69 int 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 } 86 EXPORT_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 */ 97 int 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 } 132 EXPORT_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 */ 140 int 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 } 149 EXPORT_SYMBOL(mdio45_nway_restart); 150 151 static 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 return result; 166 } 167 168 /** 169 * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET 170 * @mdio: MDIO interface 171 * @ecmd: Ethtool request structure 172 * @npage_adv: Modes currently advertised on next pages 173 * @npage_lpa: Modes advertised by link partner on next pages 174 * 175 * Since the CSRs for auto-negotiation using next pages are not fully 176 * standardised, this function does not attempt to decode them. The 177 * caller must pass them in. 178 */ 179 void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio, 180 struct ethtool_cmd *ecmd, 181 u32 npage_adv, u32 npage_lpa) 182 { 183 int reg; 184 185 ecmd->transceiver = XCVR_INTERNAL; 186 ecmd->phy_address = mdio->prtad; 187 ecmd->mdio_support = 188 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22); 189 190 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 191 MDIO_CTRL2); 192 switch (reg & MDIO_PMA_CTRL2_TYPE) { 193 case MDIO_PMA_CTRL2_10GBT: 194 case MDIO_PMA_CTRL2_1000BT: 195 case MDIO_PMA_CTRL2_100BTX: 196 case MDIO_PMA_CTRL2_10BT: 197 ecmd->port = PORT_TP; 198 ecmd->supported = SUPPORTED_TP; 199 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 200 MDIO_SPEED); 201 if (reg & MDIO_SPEED_10G) 202 ecmd->supported |= SUPPORTED_10000baseT_Full; 203 if (reg & MDIO_PMA_SPEED_1000) 204 ecmd->supported |= (SUPPORTED_1000baseT_Full | 205 SUPPORTED_1000baseT_Half); 206 if (reg & MDIO_PMA_SPEED_100) 207 ecmd->supported |= (SUPPORTED_100baseT_Full | 208 SUPPORTED_100baseT_Half); 209 if (reg & MDIO_PMA_SPEED_10) 210 ecmd->supported |= (SUPPORTED_10baseT_Full | 211 SUPPORTED_10baseT_Half); 212 ecmd->advertising = ADVERTISED_TP; 213 break; 214 215 case MDIO_PMA_CTRL2_10GBCX4: 216 ecmd->port = PORT_OTHER; 217 ecmd->supported = 0; 218 ecmd->advertising = 0; 219 break; 220 221 case MDIO_PMA_CTRL2_10GBKX4: 222 case MDIO_PMA_CTRL2_10GBKR: 223 case MDIO_PMA_CTRL2_1000BKX: 224 ecmd->port = PORT_OTHER; 225 ecmd->supported = SUPPORTED_Backplane; 226 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 227 MDIO_PMA_EXTABLE); 228 if (reg & MDIO_PMA_EXTABLE_10GBKX4) 229 ecmd->supported |= SUPPORTED_10000baseKX4_Full; 230 if (reg & MDIO_PMA_EXTABLE_10GBKR) 231 ecmd->supported |= SUPPORTED_10000baseKR_Full; 232 if (reg & MDIO_PMA_EXTABLE_1000BKX) 233 ecmd->supported |= SUPPORTED_1000baseKX_Full; 234 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 235 MDIO_PMA_10GBR_FECABLE); 236 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE) 237 ecmd->supported |= SUPPORTED_10000baseR_FEC; 238 ecmd->advertising = ADVERTISED_Backplane; 239 break; 240 241 /* All the other defined modes are flavours of optical */ 242 default: 243 ecmd->port = PORT_FIBRE; 244 ecmd->supported = SUPPORTED_FIBRE; 245 ecmd->advertising = ADVERTISED_FIBRE; 246 break; 247 } 248 249 if (mdio->mmds & MDIO_DEVS_AN) { 250 ecmd->supported |= SUPPORTED_Autoneg; 251 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 252 MDIO_CTRL1); 253 if (reg & MDIO_AN_CTRL1_ENABLE) { 254 ecmd->autoneg = AUTONEG_ENABLE; 255 ecmd->advertising |= 256 ADVERTISED_Autoneg | 257 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) | 258 npage_adv; 259 } else { 260 ecmd->autoneg = AUTONEG_DISABLE; 261 } 262 } else { 263 ecmd->autoneg = AUTONEG_DISABLE; 264 } 265 266 if (ecmd->autoneg) { 267 u32 modes = 0; 268 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad, 269 MDIO_MMD_AN, MDIO_STAT1); 270 271 /* If AN is complete and successful, report best common 272 * mode, otherwise report best advertised mode. */ 273 if (an_stat & MDIO_AN_STAT1_COMPLETE) { 274 ecmd->lp_advertising = 275 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa; 276 if (an_stat & MDIO_AN_STAT1_LPABLE) 277 ecmd->lp_advertising |= ADVERTISED_Autoneg; 278 modes = ecmd->advertising & ecmd->lp_advertising; 279 } 280 if ((modes & ~ADVERTISED_Autoneg) == 0) 281 modes = ecmd->advertising; 282 283 if (modes & (ADVERTISED_10000baseT_Full | 284 ADVERTISED_10000baseKX4_Full | 285 ADVERTISED_10000baseKR_Full)) { 286 ecmd->speed = SPEED_10000; 287 ecmd->duplex = DUPLEX_FULL; 288 } else if (modes & (ADVERTISED_1000baseT_Full | 289 ADVERTISED_1000baseT_Half | 290 ADVERTISED_1000baseKX_Full)) { 291 ecmd->speed = SPEED_1000; 292 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half); 293 } else if (modes & (ADVERTISED_100baseT_Full | 294 ADVERTISED_100baseT_Half)) { 295 ecmd->speed = SPEED_100; 296 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full); 297 } else { 298 ecmd->speed = SPEED_10; 299 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full); 300 } 301 } else { 302 /* Report forced settings */ 303 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 304 MDIO_CTRL1); 305 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) * 306 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10)); 307 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX || 308 ecmd->speed == SPEED_10000); 309 } 310 311 /* 10GBASE-T MDI/MDI-X */ 312 if (ecmd->port == PORT_TP && ecmd->speed == SPEED_10000) { 313 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 314 MDIO_PMA_10GBT_SWAPPOL)) { 315 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX: 316 ecmd->eth_tp_mdix = ETH_TP_MDI; 317 break; 318 case 0: 319 ecmd->eth_tp_mdix = ETH_TP_MDI_X; 320 break; 321 default: 322 /* It's complicated... */ 323 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID; 324 break; 325 } 326 } 327 } 328 EXPORT_SYMBOL(mdio45_ethtool_gset_npage); 329 330 /** 331 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters 332 * @mdio: MDIO interface 333 * @ecmd: Ethtool request structure 334 * 335 * This function assumes that the PHY has an auto-negotiation MMD. It 336 * will enable and disable advertising of flow control as appropriate. 337 */ 338 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio, 339 const struct ethtool_pauseparam *ecmd) 340 { 341 int adv, old_adv; 342 343 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN)); 344 345 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 346 MDIO_AN_ADVERTISE); 347 adv = old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM); 348 if (ecmd->autoneg) 349 adv |= mii_advertise_flowctrl( 350 (ecmd->rx_pause ? FLOW_CTRL_RX : 0) | 351 (ecmd->tx_pause ? FLOW_CTRL_TX : 0)); 352 if (adv != old_adv) { 353 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN, 354 MDIO_AN_ADVERTISE, adv); 355 mdio45_nway_restart(mdio); 356 } 357 } 358 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an); 359 360 /** 361 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs 362 * @mdio: MDIO interface 363 * @mii_data: MII ioctl data structure 364 * @cmd: MII ioctl command 365 * 366 * Returns 0 on success, negative on error. 367 */ 368 int mdio_mii_ioctl(const struct mdio_if_info *mdio, 369 struct mii_ioctl_data *mii_data, int cmd) 370 { 371 int prtad, devad; 372 u16 addr = mii_data->reg_num; 373 374 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */ 375 switch (cmd) { 376 case SIOCGMIIPHY: 377 if (mdio->prtad == MDIO_PRTAD_NONE) 378 return -EOPNOTSUPP; 379 mii_data->phy_id = mdio->prtad; 380 cmd = SIOCGMIIREG; 381 break; 382 case SIOCGMIIREG: 383 case SIOCSMIIREG: 384 break; 385 default: 386 return -EOPNOTSUPP; 387 } 388 389 /* Validate/convert phy_id */ 390 if ((mdio->mode_support & MDIO_SUPPORTS_C45) && 391 mdio_phy_id_is_c45(mii_data->phy_id)) { 392 prtad = mdio_phy_id_prtad(mii_data->phy_id); 393 devad = mdio_phy_id_devad(mii_data->phy_id); 394 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) && 395 mii_data->phy_id < 0x20) { 396 prtad = mii_data->phy_id; 397 devad = MDIO_DEVAD_NONE; 398 addr &= 0x1f; 399 } else if ((mdio->mode_support & MDIO_EMULATE_C22) && 400 mdio->prtad != MDIO_PRTAD_NONE && 401 mii_data->phy_id == mdio->prtad) { 402 /* Remap commonly-used MII registers. */ 403 prtad = mdio->prtad; 404 switch (addr) { 405 case MII_BMCR: 406 case MII_BMSR: 407 case MII_PHYSID1: 408 case MII_PHYSID2: 409 devad = __ffs(mdio->mmds); 410 break; 411 case MII_ADVERTISE: 412 case MII_LPA: 413 if (!(mdio->mmds & MDIO_DEVS_AN)) 414 return -EINVAL; 415 devad = MDIO_MMD_AN; 416 if (addr == MII_ADVERTISE) 417 addr = MDIO_AN_ADVERTISE; 418 else 419 addr = MDIO_AN_LPA; 420 break; 421 default: 422 return -EINVAL; 423 } 424 } else { 425 return -EINVAL; 426 } 427 428 if (cmd == SIOCGMIIREG) { 429 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr); 430 if (rc < 0) 431 return rc; 432 mii_data->val_out = rc; 433 return 0; 434 } else { 435 return mdio->mdio_write(mdio->dev, prtad, devad, addr, 436 mii_data->val_in); 437 } 438 } 439 EXPORT_SYMBOL(mdio_mii_ioctl); 440