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 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 */ 186 void 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; 191 192 ecmd->transceiver = XCVR_INTERNAL; 193 ecmd->phy_address = mdio->prtad; 194 ecmd->mdio_support = 195 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22); 196 197 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 198 MDIO_CTRL2); 199 switch (reg & MDIO_PMA_CTRL2_TYPE) { 200 case MDIO_PMA_CTRL2_10GBT: 201 case MDIO_PMA_CTRL2_1000BT: 202 case MDIO_PMA_CTRL2_100BTX: 203 case MDIO_PMA_CTRL2_10BT: 204 ecmd->port = PORT_TP; 205 ecmd->supported = SUPPORTED_TP; 206 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 207 MDIO_SPEED); 208 if (reg & MDIO_SPEED_10G) 209 ecmd->supported |= SUPPORTED_10000baseT_Full; 210 if (reg & MDIO_PMA_SPEED_1000) 211 ecmd->supported |= (SUPPORTED_1000baseT_Full | 212 SUPPORTED_1000baseT_Half); 213 if (reg & MDIO_PMA_SPEED_100) 214 ecmd->supported |= (SUPPORTED_100baseT_Full | 215 SUPPORTED_100baseT_Half); 216 if (reg & MDIO_PMA_SPEED_10) 217 ecmd->supported |= (SUPPORTED_10baseT_Full | 218 SUPPORTED_10baseT_Half); 219 ecmd->advertising = ADVERTISED_TP; 220 break; 221 222 case MDIO_PMA_CTRL2_10GBCX4: 223 ecmd->port = PORT_OTHER; 224 ecmd->supported = 0; 225 ecmd->advertising = 0; 226 break; 227 228 case MDIO_PMA_CTRL2_10GBKX4: 229 case MDIO_PMA_CTRL2_10GBKR: 230 case MDIO_PMA_CTRL2_1000BKX: 231 ecmd->port = PORT_OTHER; 232 ecmd->supported = SUPPORTED_Backplane; 233 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 234 MDIO_PMA_EXTABLE); 235 if (reg & MDIO_PMA_EXTABLE_10GBKX4) 236 ecmd->supported |= SUPPORTED_10000baseKX4_Full; 237 if (reg & MDIO_PMA_EXTABLE_10GBKR) 238 ecmd->supported |= SUPPORTED_10000baseKR_Full; 239 if (reg & MDIO_PMA_EXTABLE_1000BKX) 240 ecmd->supported |= SUPPORTED_1000baseKX_Full; 241 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 242 MDIO_PMA_10GBR_FECABLE); 243 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE) 244 ecmd->supported |= SUPPORTED_10000baseR_FEC; 245 ecmd->advertising = ADVERTISED_Backplane; 246 break; 247 248 /* All the other defined modes are flavours of optical */ 249 default: 250 ecmd->port = PORT_FIBRE; 251 ecmd->supported = SUPPORTED_FIBRE; 252 ecmd->advertising = ADVERTISED_FIBRE; 253 break; 254 } 255 256 if (mdio->mmds & MDIO_DEVS_AN) { 257 ecmd->supported |= SUPPORTED_Autoneg; 258 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 259 MDIO_CTRL1); 260 if (reg & MDIO_AN_CTRL1_ENABLE) { 261 ecmd->autoneg = AUTONEG_ENABLE; 262 ecmd->advertising |= 263 ADVERTISED_Autoneg | 264 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) | 265 npage_adv; 266 } else { 267 ecmd->autoneg = AUTONEG_DISABLE; 268 } 269 } else { 270 ecmd->autoneg = AUTONEG_DISABLE; 271 } 272 273 if (ecmd->autoneg) { 274 u32 modes = 0; 275 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad, 276 MDIO_MMD_AN, MDIO_STAT1); 277 278 /* If AN is complete and successful, report best common 279 * mode, otherwise report best advertised mode. */ 280 if (an_stat & MDIO_AN_STAT1_COMPLETE) { 281 ecmd->lp_advertising = 282 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa; 283 if (an_stat & MDIO_AN_STAT1_LPABLE) 284 ecmd->lp_advertising |= ADVERTISED_Autoneg; 285 modes = ecmd->advertising & ecmd->lp_advertising; 286 } 287 if ((modes & ~ADVERTISED_Autoneg) == 0) 288 modes = ecmd->advertising; 289 290 if (modes & (ADVERTISED_10000baseT_Full | 291 ADVERTISED_10000baseKX4_Full | 292 ADVERTISED_10000baseKR_Full)) { 293 ecmd->speed = SPEED_10000; 294 ecmd->duplex = DUPLEX_FULL; 295 } else if (modes & (ADVERTISED_1000baseT_Full | 296 ADVERTISED_1000baseT_Half | 297 ADVERTISED_1000baseKX_Full)) { 298 ecmd->speed = SPEED_1000; 299 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half); 300 } else if (modes & (ADVERTISED_100baseT_Full | 301 ADVERTISED_100baseT_Half)) { 302 ecmd->speed = SPEED_100; 303 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full); 304 } else { 305 ecmd->speed = SPEED_10; 306 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full); 307 } 308 } else { 309 /* Report forced settings */ 310 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 311 MDIO_CTRL1); 312 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) * 313 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10)); 314 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX || 315 ecmd->speed == SPEED_10000); 316 } 317 318 /* 10GBASE-T MDI/MDI-X */ 319 if (ecmd->port == PORT_TP && ecmd->speed == SPEED_10000) { 320 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 321 MDIO_PMA_10GBT_SWAPPOL)) { 322 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX: 323 ecmd->eth_tp_mdix = ETH_TP_MDI; 324 break; 325 case 0: 326 ecmd->eth_tp_mdix = ETH_TP_MDI_X; 327 break; 328 default: 329 /* It's complicated... */ 330 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID; 331 break; 332 } 333 } 334 } 335 EXPORT_SYMBOL(mdio45_ethtool_gset_npage); 336 337 /** 338 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters 339 * @mdio: MDIO interface 340 * @ecmd: Ethtool request structure 341 * 342 * This function assumes that the PHY has an auto-negotiation MMD. It 343 * will enable and disable advertising of flow control as appropriate. 344 */ 345 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio, 346 const struct ethtool_pauseparam *ecmd) 347 { 348 int adv, old_adv; 349 350 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN)); 351 352 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 353 MDIO_AN_ADVERTISE); 354 adv = ((old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) | 355 mii_advertise_flowctrl((ecmd->rx_pause ? FLOW_CTRL_RX : 0) | 356 (ecmd->tx_pause ? FLOW_CTRL_TX : 0))); 357 if (adv != old_adv) { 358 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN, 359 MDIO_AN_ADVERTISE, adv); 360 mdio45_nway_restart(mdio); 361 } 362 } 363 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an); 364 365 /** 366 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs 367 * @mdio: MDIO interface 368 * @mii_data: MII ioctl data structure 369 * @cmd: MII ioctl command 370 * 371 * Returns 0 on success, negative on error. 372 */ 373 int mdio_mii_ioctl(const struct mdio_if_info *mdio, 374 struct mii_ioctl_data *mii_data, int cmd) 375 { 376 int prtad, devad; 377 u16 addr = mii_data->reg_num; 378 379 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */ 380 switch (cmd) { 381 case SIOCGMIIPHY: 382 if (mdio->prtad == MDIO_PRTAD_NONE) 383 return -EOPNOTSUPP; 384 mii_data->phy_id = mdio->prtad; 385 cmd = SIOCGMIIREG; 386 break; 387 case SIOCGMIIREG: 388 case SIOCSMIIREG: 389 break; 390 default: 391 return -EOPNOTSUPP; 392 } 393 394 /* Validate/convert phy_id */ 395 if ((mdio->mode_support & MDIO_SUPPORTS_C45) && 396 mdio_phy_id_is_c45(mii_data->phy_id)) { 397 prtad = mdio_phy_id_prtad(mii_data->phy_id); 398 devad = mdio_phy_id_devad(mii_data->phy_id); 399 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) && 400 mii_data->phy_id < 0x20) { 401 prtad = mii_data->phy_id; 402 devad = MDIO_DEVAD_NONE; 403 addr &= 0x1f; 404 } else if ((mdio->mode_support & MDIO_EMULATE_C22) && 405 mdio->prtad != MDIO_PRTAD_NONE && 406 mii_data->phy_id == mdio->prtad) { 407 /* Remap commonly-used MII registers. */ 408 prtad = mdio->prtad; 409 switch (addr) { 410 case MII_BMCR: 411 case MII_BMSR: 412 case MII_PHYSID1: 413 case MII_PHYSID2: 414 devad = __ffs(mdio->mmds); 415 break; 416 case MII_ADVERTISE: 417 case MII_LPA: 418 if (!(mdio->mmds & MDIO_DEVS_AN)) 419 return -EINVAL; 420 devad = MDIO_MMD_AN; 421 if (addr == MII_ADVERTISE) 422 addr = MDIO_AN_ADVERTISE; 423 else 424 addr = MDIO_AN_LPA; 425 break; 426 default: 427 return -EINVAL; 428 } 429 } else { 430 return -EINVAL; 431 } 432 433 if (cmd == SIOCGMIIREG) { 434 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr); 435 if (rc < 0) 436 return rc; 437 mii_data->val_out = rc; 438 return 0; 439 } else { 440 return mdio->mdio_write(mdio->dev, prtad, devad, addr, 441 mii_data->val_in); 442 } 443 } 444 EXPORT_SYMBOL(mdio_mii_ioctl); 445