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 u32 speed; 192 193 ecmd->transceiver = XCVR_INTERNAL; 194 ecmd->phy_address = mdio->prtad; 195 ecmd->mdio_support = 196 mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22); 197 198 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 199 MDIO_CTRL2); 200 switch (reg & MDIO_PMA_CTRL2_TYPE) { 201 case MDIO_PMA_CTRL2_10GBT: 202 case MDIO_PMA_CTRL2_1000BT: 203 case MDIO_PMA_CTRL2_100BTX: 204 case MDIO_PMA_CTRL2_10BT: 205 ecmd->port = PORT_TP; 206 ecmd->supported = SUPPORTED_TP; 207 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 208 MDIO_SPEED); 209 if (reg & MDIO_SPEED_10G) 210 ecmd->supported |= SUPPORTED_10000baseT_Full; 211 if (reg & MDIO_PMA_SPEED_1000) 212 ecmd->supported |= (SUPPORTED_1000baseT_Full | 213 SUPPORTED_1000baseT_Half); 214 if (reg & MDIO_PMA_SPEED_100) 215 ecmd->supported |= (SUPPORTED_100baseT_Full | 216 SUPPORTED_100baseT_Half); 217 if (reg & MDIO_PMA_SPEED_10) 218 ecmd->supported |= (SUPPORTED_10baseT_Full | 219 SUPPORTED_10baseT_Half); 220 ecmd->advertising = ADVERTISED_TP; 221 break; 222 223 case MDIO_PMA_CTRL2_10GBCX4: 224 ecmd->port = PORT_OTHER; 225 ecmd->supported = 0; 226 ecmd->advertising = 0; 227 break; 228 229 case MDIO_PMA_CTRL2_10GBKX4: 230 case MDIO_PMA_CTRL2_10GBKR: 231 case MDIO_PMA_CTRL2_1000BKX: 232 ecmd->port = PORT_OTHER; 233 ecmd->supported = SUPPORTED_Backplane; 234 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 235 MDIO_PMA_EXTABLE); 236 if (reg & MDIO_PMA_EXTABLE_10GBKX4) 237 ecmd->supported |= SUPPORTED_10000baseKX4_Full; 238 if (reg & MDIO_PMA_EXTABLE_10GBKR) 239 ecmd->supported |= SUPPORTED_10000baseKR_Full; 240 if (reg & MDIO_PMA_EXTABLE_1000BKX) 241 ecmd->supported |= SUPPORTED_1000baseKX_Full; 242 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 243 MDIO_PMA_10GBR_FECABLE); 244 if (reg & MDIO_PMA_10GBR_FECABLE_ABLE) 245 ecmd->supported |= SUPPORTED_10000baseR_FEC; 246 ecmd->advertising = ADVERTISED_Backplane; 247 break; 248 249 /* All the other defined modes are flavours of optical */ 250 default: 251 ecmd->port = PORT_FIBRE; 252 ecmd->supported = SUPPORTED_FIBRE; 253 ecmd->advertising = ADVERTISED_FIBRE; 254 break; 255 } 256 257 if (mdio->mmds & MDIO_DEVS_AN) { 258 ecmd->supported |= SUPPORTED_Autoneg; 259 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 260 MDIO_CTRL1); 261 if (reg & MDIO_AN_CTRL1_ENABLE) { 262 ecmd->autoneg = AUTONEG_ENABLE; 263 ecmd->advertising |= 264 ADVERTISED_Autoneg | 265 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) | 266 npage_adv; 267 } else { 268 ecmd->autoneg = AUTONEG_DISABLE; 269 } 270 } else { 271 ecmd->autoneg = AUTONEG_DISABLE; 272 } 273 274 if (ecmd->autoneg) { 275 u32 modes = 0; 276 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad, 277 MDIO_MMD_AN, MDIO_STAT1); 278 279 /* If AN is complete and successful, report best common 280 * mode, otherwise report best advertised mode. */ 281 if (an_stat & MDIO_AN_STAT1_COMPLETE) { 282 ecmd->lp_advertising = 283 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa; 284 if (an_stat & MDIO_AN_STAT1_LPABLE) 285 ecmd->lp_advertising |= ADVERTISED_Autoneg; 286 modes = ecmd->advertising & ecmd->lp_advertising; 287 } 288 if ((modes & ~ADVERTISED_Autoneg) == 0) 289 modes = ecmd->advertising; 290 291 if (modes & (ADVERTISED_10000baseT_Full | 292 ADVERTISED_10000baseKX4_Full | 293 ADVERTISED_10000baseKR_Full)) { 294 speed = SPEED_10000; 295 ecmd->duplex = DUPLEX_FULL; 296 } else if (modes & (ADVERTISED_1000baseT_Full | 297 ADVERTISED_1000baseT_Half | 298 ADVERTISED_1000baseKX_Full)) { 299 speed = SPEED_1000; 300 ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half); 301 } else if (modes & (ADVERTISED_100baseT_Full | 302 ADVERTISED_100baseT_Half)) { 303 speed = SPEED_100; 304 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full); 305 } else { 306 speed = SPEED_10; 307 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full); 308 } 309 } else { 310 /* Report forced settings */ 311 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 312 MDIO_CTRL1); 313 speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) 314 * ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10)); 315 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX || 316 speed == SPEED_10000); 317 } 318 319 ethtool_cmd_speed_set(ecmd, speed); 320 321 /* 10GBASE-T MDI/MDI-X */ 322 if (ecmd->port == PORT_TP 323 && (ethtool_cmd_speed(ecmd) == SPEED_10000)) { 324 switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 325 MDIO_PMA_10GBT_SWAPPOL)) { 326 case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX: 327 ecmd->eth_tp_mdix = ETH_TP_MDI; 328 break; 329 case 0: 330 ecmd->eth_tp_mdix = ETH_TP_MDI_X; 331 break; 332 default: 333 /* It's complicated... */ 334 ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID; 335 break; 336 } 337 } 338 } 339 EXPORT_SYMBOL(mdio45_ethtool_gset_npage); 340 341 /** 342 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters 343 * @mdio: MDIO interface 344 * @ecmd: Ethtool request structure 345 * 346 * This function assumes that the PHY has an auto-negotiation MMD. It 347 * will enable and disable advertising of flow control as appropriate. 348 */ 349 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio, 350 const struct ethtool_pauseparam *ecmd) 351 { 352 int adv, old_adv; 353 354 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN)); 355 356 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 357 MDIO_AN_ADVERTISE); 358 adv = ((old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) | 359 mii_advertise_flowctrl((ecmd->rx_pause ? FLOW_CTRL_RX : 0) | 360 (ecmd->tx_pause ? FLOW_CTRL_TX : 0))); 361 if (adv != old_adv) { 362 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN, 363 MDIO_AN_ADVERTISE, adv); 364 mdio45_nway_restart(mdio); 365 } 366 } 367 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an); 368 369 /** 370 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs 371 * @mdio: MDIO interface 372 * @mii_data: MII ioctl data structure 373 * @cmd: MII ioctl command 374 * 375 * Returns 0 on success, negative on error. 376 */ 377 int mdio_mii_ioctl(const struct mdio_if_info *mdio, 378 struct mii_ioctl_data *mii_data, int cmd) 379 { 380 int prtad, devad; 381 u16 addr = mii_data->reg_num; 382 383 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */ 384 switch (cmd) { 385 case SIOCGMIIPHY: 386 if (mdio->prtad == MDIO_PRTAD_NONE) 387 return -EOPNOTSUPP; 388 mii_data->phy_id = mdio->prtad; 389 cmd = SIOCGMIIREG; 390 break; 391 case SIOCGMIIREG: 392 case SIOCSMIIREG: 393 break; 394 default: 395 return -EOPNOTSUPP; 396 } 397 398 /* Validate/convert phy_id */ 399 if ((mdio->mode_support & MDIO_SUPPORTS_C45) && 400 mdio_phy_id_is_c45(mii_data->phy_id)) { 401 prtad = mdio_phy_id_prtad(mii_data->phy_id); 402 devad = mdio_phy_id_devad(mii_data->phy_id); 403 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) && 404 mii_data->phy_id < 0x20) { 405 prtad = mii_data->phy_id; 406 devad = MDIO_DEVAD_NONE; 407 addr &= 0x1f; 408 } else if ((mdio->mode_support & MDIO_EMULATE_C22) && 409 mdio->prtad != MDIO_PRTAD_NONE && 410 mii_data->phy_id == mdio->prtad) { 411 /* Remap commonly-used MII registers. */ 412 prtad = mdio->prtad; 413 switch (addr) { 414 case MII_BMCR: 415 case MII_BMSR: 416 case MII_PHYSID1: 417 case MII_PHYSID2: 418 devad = __ffs(mdio->mmds); 419 break; 420 case MII_ADVERTISE: 421 case MII_LPA: 422 if (!(mdio->mmds & MDIO_DEVS_AN)) 423 return -EINVAL; 424 devad = MDIO_MMD_AN; 425 if (addr == MII_ADVERTISE) 426 addr = MDIO_AN_ADVERTISE; 427 else 428 addr = MDIO_AN_LPA; 429 break; 430 default: 431 return -EINVAL; 432 } 433 } else { 434 return -EINVAL; 435 } 436 437 if (cmd == SIOCGMIIREG) { 438 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr); 439 if (rc < 0) 440 return rc; 441 mii_data->val_out = rc; 442 return 0; 443 } else { 444 return mdio->mdio_write(mdio->dev, prtad, devad, addr, 445 mii_data->val_in); 446 } 447 } 448 EXPORT_SYMBOL(mdio_mii_ioctl); 449