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 case MDIO_PMA_CTRL2_10GBKX4: 206 case MDIO_PMA_CTRL2_10GBKR: 207 case MDIO_PMA_CTRL2_1000BKX: 208 ecmd->port = PORT_OTHER; 209 ecmd->supported = 0; 210 ecmd->advertising = 0; 211 break; 212 213 /* All the other defined modes are flavours of optical */ 214 default: 215 ecmd->port = PORT_FIBRE; 216 ecmd->supported = SUPPORTED_FIBRE; 217 ecmd->advertising = ADVERTISED_FIBRE; 218 break; 219 } 220 221 if (mdio->mmds & MDIO_DEVS_AN) { 222 ecmd->supported |= SUPPORTED_Autoneg; 223 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 224 MDIO_CTRL1); 225 if (reg & MDIO_AN_CTRL1_ENABLE) { 226 ecmd->autoneg = AUTONEG_ENABLE; 227 ecmd->advertising |= 228 ADVERTISED_Autoneg | 229 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) | 230 npage_adv; 231 } else { 232 ecmd->autoneg = AUTONEG_DISABLE; 233 } 234 } else { 235 ecmd->autoneg = AUTONEG_DISABLE; 236 } 237 238 if (ecmd->autoneg) { 239 u32 modes = 0; 240 int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad, 241 MDIO_MMD_AN, MDIO_STAT1); 242 243 /* If AN is complete and successful, report best common 244 * mode, otherwise report best advertised mode. */ 245 if (an_stat & MDIO_AN_STAT1_COMPLETE) { 246 ecmd->lp_advertising = 247 mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa; 248 if (an_stat & MDIO_AN_STAT1_LPABLE) 249 ecmd->lp_advertising |= ADVERTISED_Autoneg; 250 modes = ecmd->advertising & ecmd->lp_advertising; 251 } 252 if ((modes & ~ADVERTISED_Autoneg) == 0) 253 modes = ecmd->advertising; 254 255 if (modes & ADVERTISED_10000baseT_Full) { 256 ecmd->speed = SPEED_10000; 257 ecmd->duplex = DUPLEX_FULL; 258 } else if (modes & (ADVERTISED_1000baseT_Full | 259 ADVERTISED_1000baseT_Half)) { 260 ecmd->speed = SPEED_1000; 261 ecmd->duplex = !!(modes & ADVERTISED_1000baseT_Full); 262 } else if (modes & (ADVERTISED_100baseT_Full | 263 ADVERTISED_100baseT_Half)) { 264 ecmd->speed = SPEED_100; 265 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full); 266 } else { 267 ecmd->speed = SPEED_10; 268 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full); 269 } 270 } else { 271 /* Report forced settings */ 272 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 273 MDIO_CTRL1); 274 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) * 275 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10)); 276 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX || 277 ecmd->speed == SPEED_10000); 278 } 279 } 280 EXPORT_SYMBOL(mdio45_ethtool_gset_npage); 281 282 /** 283 * mdio45_ethtool_spauseparam_an - set auto-negotiated pause parameters 284 * @mdio: MDIO interface 285 * @ecmd: Ethtool request structure 286 * 287 * This function assumes that the PHY has an auto-negotiation MMD. It 288 * will enable and disable advertising of flow control as appropriate. 289 */ 290 void mdio45_ethtool_spauseparam_an(const struct mdio_if_info *mdio, 291 const struct ethtool_pauseparam *ecmd) 292 { 293 int adv, old_adv; 294 295 WARN_ON(!(mdio->mmds & MDIO_DEVS_AN)); 296 297 old_adv = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 298 MDIO_AN_ADVERTISE); 299 adv = old_adv & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM); 300 if (ecmd->autoneg) 301 adv |= mii_advertise_flowctrl( 302 (ecmd->rx_pause ? FLOW_CTRL_RX : 0) | 303 (ecmd->tx_pause ? FLOW_CTRL_TX : 0)); 304 if (adv != old_adv) { 305 mdio->mdio_write(mdio->dev, mdio->prtad, MDIO_MMD_AN, 306 MDIO_AN_ADVERTISE, adv); 307 mdio45_nway_restart(mdio); 308 } 309 } 310 EXPORT_SYMBOL(mdio45_ethtool_spauseparam_an); 311 312 /** 313 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs 314 * @mdio: MDIO interface 315 * @mii_data: MII ioctl data structure 316 * @cmd: MII ioctl command 317 * 318 * Returns 0 on success, negative on error. 319 */ 320 int mdio_mii_ioctl(const struct mdio_if_info *mdio, 321 struct mii_ioctl_data *mii_data, int cmd) 322 { 323 int prtad, devad; 324 u16 addr = mii_data->reg_num; 325 326 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */ 327 switch (cmd) { 328 case SIOCGMIIPHY: 329 if (mdio->prtad == MDIO_PRTAD_NONE) 330 return -EOPNOTSUPP; 331 mii_data->phy_id = mdio->prtad; 332 cmd = SIOCGMIIREG; 333 break; 334 case SIOCGMIIREG: 335 break; 336 case SIOCSMIIREG: 337 if (!capable(CAP_NET_ADMIN)) 338 return -EPERM; 339 break; 340 default: 341 return -EOPNOTSUPP; 342 } 343 344 /* Validate/convert phy_id */ 345 if ((mdio->mode_support & MDIO_SUPPORTS_C45) && 346 mdio_phy_id_is_c45(mii_data->phy_id)) { 347 prtad = mdio_phy_id_prtad(mii_data->phy_id); 348 devad = mdio_phy_id_devad(mii_data->phy_id); 349 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) && 350 mii_data->phy_id < 0x20) { 351 prtad = mii_data->phy_id; 352 devad = MDIO_DEVAD_NONE; 353 addr &= 0x1f; 354 } else if ((mdio->mode_support & MDIO_EMULATE_C22) && 355 mdio->prtad != MDIO_PRTAD_NONE && 356 mii_data->phy_id == mdio->prtad) { 357 /* Remap commonly-used MII registers. */ 358 prtad = mdio->prtad; 359 switch (addr) { 360 case MII_BMCR: 361 case MII_BMSR: 362 case MII_PHYSID1: 363 case MII_PHYSID2: 364 devad = __ffs(mdio->mmds); 365 break; 366 case MII_ADVERTISE: 367 case MII_LPA: 368 if (!(mdio->mmds & MDIO_DEVS_AN)) 369 return -EINVAL; 370 devad = MDIO_MMD_AN; 371 if (addr == MII_ADVERTISE) 372 addr = MDIO_AN_ADVERTISE; 373 else 374 addr = MDIO_AN_LPA; 375 break; 376 default: 377 return -EINVAL; 378 } 379 } else { 380 return -EINVAL; 381 } 382 383 if (cmd == SIOCGMIIREG) { 384 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr); 385 if (rc < 0) 386 return rc; 387 mii_data->val_out = rc; 388 return 0; 389 } else { 390 return mdio->mdio_write(mdio->dev, prtad, devad, addr, 391 mii_data->val_in); 392 } 393 } 394 EXPORT_SYMBOL(mdio_mii_ioctl); 395