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; 176 177 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 178 MDIO_CTRL2); 179 switch (reg & MDIO_PMA_CTRL2_TYPE) { 180 case MDIO_PMA_CTRL2_10GBT: 181 case MDIO_PMA_CTRL2_1000BT: 182 case MDIO_PMA_CTRL2_100BTX: 183 case MDIO_PMA_CTRL2_10BT: 184 ecmd->port = PORT_TP; 185 ecmd->supported = SUPPORTED_TP; 186 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 187 MDIO_SPEED); 188 if (reg & MDIO_SPEED_10G) 189 ecmd->supported |= SUPPORTED_10000baseT_Full; 190 if (reg & MDIO_PMA_SPEED_1000) 191 ecmd->supported |= (SUPPORTED_1000baseT_Full | 192 SUPPORTED_1000baseT_Half); 193 if (reg & MDIO_PMA_SPEED_100) 194 ecmd->supported |= (SUPPORTED_100baseT_Full | 195 SUPPORTED_100baseT_Half); 196 if (reg & MDIO_PMA_SPEED_10) 197 ecmd->supported |= (SUPPORTED_10baseT_Full | 198 SUPPORTED_10baseT_Half); 199 ecmd->advertising = ADVERTISED_TP; 200 break; 201 202 case MDIO_PMA_CTRL2_10GBCX4: 203 case MDIO_PMA_CTRL2_10GBKX4: 204 case MDIO_PMA_CTRL2_10GBKR: 205 case MDIO_PMA_CTRL2_1000BKX: 206 ecmd->port = PORT_OTHER; 207 ecmd->supported = 0; 208 ecmd->advertising = 0; 209 break; 210 211 /* All the other defined modes are flavours of optical */ 212 default: 213 ecmd->port = PORT_FIBRE; 214 ecmd->supported = SUPPORTED_FIBRE; 215 ecmd->advertising = ADVERTISED_FIBRE; 216 break; 217 } 218 219 if (mdio->mmds & MDIO_DEVS_AN) { 220 ecmd->supported |= SUPPORTED_Autoneg; 221 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 222 MDIO_CTRL1); 223 if (reg & MDIO_AN_CTRL1_ENABLE) { 224 ecmd->autoneg = AUTONEG_ENABLE; 225 ecmd->advertising |= 226 ADVERTISED_Autoneg | 227 mdio45_get_an(mdio, MDIO_AN_ADVERTISE) | 228 npage_adv; 229 } else { 230 ecmd->autoneg = AUTONEG_DISABLE; 231 } 232 } else { 233 ecmd->autoneg = AUTONEG_DISABLE; 234 } 235 236 if (ecmd->autoneg) { 237 u32 modes = 0; 238 239 /* If AN is complete and successful, report best common 240 * mode, otherwise report best advertised mode. */ 241 if (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, 242 MDIO_STAT1) & 243 MDIO_AN_STAT1_COMPLETE) 244 modes = (ecmd->advertising & 245 (mdio45_get_an(mdio, MDIO_AN_LPA) | 246 npage_lpa)); 247 if (modes == 0) 248 modes = ecmd->advertising; 249 250 if (modes & ADVERTISED_10000baseT_Full) { 251 ecmd->speed = SPEED_10000; 252 ecmd->duplex = DUPLEX_FULL; 253 } else if (modes & (ADVERTISED_1000baseT_Full | 254 ADVERTISED_1000baseT_Half)) { 255 ecmd->speed = SPEED_1000; 256 ecmd->duplex = !!(modes & ADVERTISED_1000baseT_Full); 257 } else if (modes & (ADVERTISED_100baseT_Full | 258 ADVERTISED_100baseT_Half)) { 259 ecmd->speed = SPEED_100; 260 ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full); 261 } else { 262 ecmd->speed = SPEED_10; 263 ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full); 264 } 265 } else { 266 /* Report forced settings */ 267 reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD, 268 MDIO_CTRL1); 269 ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) * 270 ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10)); 271 ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX || 272 ecmd->speed == SPEED_10000); 273 } 274 } 275 EXPORT_SYMBOL(mdio45_ethtool_gset_npage); 276 277 /** 278 * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs 279 * @mdio: MDIO interface 280 * @mii_data: MII ioctl data structure 281 * @cmd: MII ioctl command 282 * 283 * Returns 0 on success, negative on error. 284 */ 285 int mdio_mii_ioctl(const struct mdio_if_info *mdio, 286 struct mii_ioctl_data *mii_data, int cmd) 287 { 288 int prtad, devad; 289 u16 addr = mii_data->reg_num; 290 291 /* Validate/convert cmd to one of SIOC{G,S}MIIREG */ 292 switch (cmd) { 293 case SIOCGMIIPHY: 294 if (mdio->prtad == MDIO_PRTAD_NONE) 295 return -EOPNOTSUPP; 296 mii_data->phy_id = mdio->prtad; 297 cmd = SIOCGMIIREG; 298 break; 299 case SIOCGMIIREG: 300 break; 301 case SIOCSMIIREG: 302 if (!capable(CAP_NET_ADMIN)) 303 return -EPERM; 304 break; 305 default: 306 return -EOPNOTSUPP; 307 } 308 309 /* Validate/convert phy_id */ 310 if ((mdio->mode_support & MDIO_SUPPORTS_C45) && 311 mdio_phy_id_is_c45(mii_data->phy_id)) { 312 prtad = mdio_phy_id_prtad(mii_data->phy_id); 313 devad = mdio_phy_id_devad(mii_data->phy_id); 314 } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) && 315 mii_data->phy_id < 0x20) { 316 prtad = mii_data->phy_id; 317 devad = MDIO_DEVAD_NONE; 318 addr &= 0x1f; 319 } else if ((mdio->mode_support & MDIO_EMULATE_C22) && 320 mdio->prtad != MDIO_PRTAD_NONE && 321 mii_data->phy_id == mdio->prtad) { 322 /* Remap commonly-used MII registers. */ 323 prtad = mdio->prtad; 324 switch (addr) { 325 case MII_BMCR: 326 case MII_BMSR: 327 case MII_PHYSID1: 328 case MII_PHYSID2: 329 devad = __ffs(mdio->mmds); 330 break; 331 case MII_ADVERTISE: 332 case MII_LPA: 333 if (!(mdio->mmds & MDIO_DEVS_AN)) 334 return -EINVAL; 335 devad = MDIO_MMD_AN; 336 if (addr == MII_ADVERTISE) 337 addr = MDIO_AN_ADVERTISE; 338 else 339 addr = MDIO_AN_LPA; 340 break; 341 default: 342 return -EINVAL; 343 } 344 } else { 345 return -EINVAL; 346 } 347 348 if (cmd == SIOCGMIIREG) { 349 int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr); 350 if (rc < 0) 351 return rc; 352 mii_data->val_out = rc; 353 return 0; 354 } else { 355 return mdio->mdio_write(mdio->dev, prtad, devad, addr, 356 mii_data->val_in); 357 } 358 } 359 EXPORT_SYMBOL(mdio_mii_ioctl); 360