1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Core PHY library, taken from phy.c 4 */ 5 #include <linux/export.h> 6 #include <linux/phy.h> 7 #include <linux/of.h> 8 9 const char *phy_speed_to_str(int speed) 10 { 11 BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 69, 12 "Enum ethtool_link_mode_bit_indices and phylib are out of sync. " 13 "If a speed or mode has been added please update phy_speed_to_str " 14 "and the PHY settings array.\n"); 15 16 switch (speed) { 17 case SPEED_10: 18 return "10Mbps"; 19 case SPEED_100: 20 return "100Mbps"; 21 case SPEED_1000: 22 return "1Gbps"; 23 case SPEED_2500: 24 return "2.5Gbps"; 25 case SPEED_5000: 26 return "5Gbps"; 27 case SPEED_10000: 28 return "10Gbps"; 29 case SPEED_14000: 30 return "14Gbps"; 31 case SPEED_20000: 32 return "20Gbps"; 33 case SPEED_25000: 34 return "25Gbps"; 35 case SPEED_40000: 36 return "40Gbps"; 37 case SPEED_50000: 38 return "50Gbps"; 39 case SPEED_56000: 40 return "56Gbps"; 41 case SPEED_100000: 42 return "100Gbps"; 43 case SPEED_200000: 44 return "200Gbps"; 45 case SPEED_UNKNOWN: 46 return "Unknown"; 47 default: 48 return "Unsupported (update phy-core.c)"; 49 } 50 } 51 EXPORT_SYMBOL_GPL(phy_speed_to_str); 52 53 const char *phy_duplex_to_str(unsigned int duplex) 54 { 55 if (duplex == DUPLEX_HALF) 56 return "Half"; 57 if (duplex == DUPLEX_FULL) 58 return "Full"; 59 if (duplex == DUPLEX_UNKNOWN) 60 return "Unknown"; 61 return "Unsupported (update phy-core.c)"; 62 } 63 EXPORT_SYMBOL_GPL(phy_duplex_to_str); 64 65 /* A mapping of all SUPPORTED settings to speed/duplex. This table 66 * must be grouped by speed and sorted in descending match priority 67 * - iow, descending speed. */ 68 69 #define PHY_SETTING(s, d, b) { .speed = SPEED_ ## s, .duplex = DUPLEX_ ## d, \ 70 .bit = ETHTOOL_LINK_MODE_ ## b ## _BIT} 71 72 static const struct phy_setting settings[] = { 73 /* 200G */ 74 PHY_SETTING( 200000, FULL, 200000baseCR4_Full ), 75 PHY_SETTING( 200000, FULL, 200000baseKR4_Full ), 76 PHY_SETTING( 200000, FULL, 200000baseLR4_ER4_FR4_Full ), 77 PHY_SETTING( 200000, FULL, 200000baseDR4_Full ), 78 PHY_SETTING( 200000, FULL, 200000baseSR4_Full ), 79 /* 100G */ 80 PHY_SETTING( 100000, FULL, 100000baseCR4_Full ), 81 PHY_SETTING( 100000, FULL, 100000baseKR4_Full ), 82 PHY_SETTING( 100000, FULL, 100000baseLR4_ER4_Full ), 83 PHY_SETTING( 100000, FULL, 100000baseSR4_Full ), 84 PHY_SETTING( 100000, FULL, 100000baseCR2_Full ), 85 PHY_SETTING( 100000, FULL, 100000baseKR2_Full ), 86 PHY_SETTING( 100000, FULL, 100000baseLR2_ER2_FR2_Full ), 87 PHY_SETTING( 100000, FULL, 100000baseDR2_Full ), 88 PHY_SETTING( 100000, FULL, 100000baseSR2_Full ), 89 /* 56G */ 90 PHY_SETTING( 56000, FULL, 56000baseCR4_Full ), 91 PHY_SETTING( 56000, FULL, 56000baseKR4_Full ), 92 PHY_SETTING( 56000, FULL, 56000baseLR4_Full ), 93 PHY_SETTING( 56000, FULL, 56000baseSR4_Full ), 94 /* 50G */ 95 PHY_SETTING( 50000, FULL, 50000baseCR2_Full ), 96 PHY_SETTING( 50000, FULL, 50000baseKR2_Full ), 97 PHY_SETTING( 50000, FULL, 50000baseSR2_Full ), 98 PHY_SETTING( 50000, FULL, 50000baseCR_Full ), 99 PHY_SETTING( 50000, FULL, 50000baseKR_Full ), 100 PHY_SETTING( 50000, FULL, 50000baseLR_ER_FR_Full ), 101 PHY_SETTING( 50000, FULL, 50000baseDR_Full ), 102 PHY_SETTING( 50000, FULL, 50000baseSR_Full ), 103 /* 40G */ 104 PHY_SETTING( 40000, FULL, 40000baseCR4_Full ), 105 PHY_SETTING( 40000, FULL, 40000baseKR4_Full ), 106 PHY_SETTING( 40000, FULL, 40000baseLR4_Full ), 107 PHY_SETTING( 40000, FULL, 40000baseSR4_Full ), 108 /* 25G */ 109 PHY_SETTING( 25000, FULL, 25000baseCR_Full ), 110 PHY_SETTING( 25000, FULL, 25000baseKR_Full ), 111 PHY_SETTING( 25000, FULL, 25000baseSR_Full ), 112 /* 20G */ 113 PHY_SETTING( 20000, FULL, 20000baseKR2_Full ), 114 PHY_SETTING( 20000, FULL, 20000baseMLD2_Full ), 115 /* 10G */ 116 PHY_SETTING( 10000, FULL, 10000baseCR_Full ), 117 PHY_SETTING( 10000, FULL, 10000baseER_Full ), 118 PHY_SETTING( 10000, FULL, 10000baseKR_Full ), 119 PHY_SETTING( 10000, FULL, 10000baseKX4_Full ), 120 PHY_SETTING( 10000, FULL, 10000baseLR_Full ), 121 PHY_SETTING( 10000, FULL, 10000baseLRM_Full ), 122 PHY_SETTING( 10000, FULL, 10000baseR_FEC ), 123 PHY_SETTING( 10000, FULL, 10000baseSR_Full ), 124 PHY_SETTING( 10000, FULL, 10000baseT_Full ), 125 /* 5G */ 126 PHY_SETTING( 5000, FULL, 5000baseT_Full ), 127 /* 2.5G */ 128 PHY_SETTING( 2500, FULL, 2500baseT_Full ), 129 PHY_SETTING( 2500, FULL, 2500baseX_Full ), 130 /* 1G */ 131 PHY_SETTING( 1000, FULL, 1000baseKX_Full ), 132 PHY_SETTING( 1000, FULL, 1000baseT_Full ), 133 PHY_SETTING( 1000, HALF, 1000baseT_Half ), 134 PHY_SETTING( 1000, FULL, 1000baseT1_Full ), 135 PHY_SETTING( 1000, FULL, 1000baseX_Full ), 136 /* 100M */ 137 PHY_SETTING( 100, FULL, 100baseT_Full ), 138 PHY_SETTING( 100, FULL, 100baseT1_Full ), 139 PHY_SETTING( 100, HALF, 100baseT_Half ), 140 /* 10M */ 141 PHY_SETTING( 10, FULL, 10baseT_Full ), 142 PHY_SETTING( 10, HALF, 10baseT_Half ), 143 }; 144 #undef PHY_SETTING 145 146 /** 147 * phy_lookup_setting - lookup a PHY setting 148 * @speed: speed to match 149 * @duplex: duplex to match 150 * @mask: allowed link modes 151 * @exact: an exact match is required 152 * 153 * Search the settings array for a setting that matches the speed and 154 * duplex, and which is supported. 155 * 156 * If @exact is unset, either an exact match or %NULL for no match will 157 * be returned. 158 * 159 * If @exact is set, an exact match, the fastest supported setting at 160 * or below the specified speed, the slowest supported setting, or if 161 * they all fail, %NULL will be returned. 162 */ 163 const struct phy_setting * 164 phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact) 165 { 166 const struct phy_setting *p, *match = NULL, *last = NULL; 167 int i; 168 169 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) { 170 if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS && 171 test_bit(p->bit, mask)) { 172 last = p; 173 if (p->speed == speed && p->duplex == duplex) { 174 /* Exact match for speed and duplex */ 175 match = p; 176 break; 177 } else if (!exact) { 178 if (!match && p->speed <= speed) 179 /* Candidate */ 180 match = p; 181 182 if (p->speed < speed) 183 break; 184 } 185 } 186 } 187 188 if (!match && !exact) 189 match = last; 190 191 return match; 192 } 193 EXPORT_SYMBOL_GPL(phy_lookup_setting); 194 195 size_t phy_speeds(unsigned int *speeds, size_t size, 196 unsigned long *mask) 197 { 198 size_t count; 199 int i; 200 201 for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++) 202 if (settings[i].bit < __ETHTOOL_LINK_MODE_MASK_NBITS && 203 test_bit(settings[i].bit, mask) && 204 (count == 0 || speeds[count - 1] != settings[i].speed)) 205 speeds[count++] = settings[i].speed; 206 207 return count; 208 } 209 210 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) 211 { 212 const struct phy_setting *p; 213 int i; 214 215 for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) { 216 if (p->speed > max_speed) 217 linkmode_clear_bit(p->bit, phydev->supported); 218 else 219 break; 220 } 221 222 return 0; 223 } 224 225 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) 226 { 227 int err; 228 229 err = __set_phy_supported(phydev, max_speed); 230 if (err) 231 return err; 232 233 phy_advertise_supported(phydev); 234 235 return 0; 236 } 237 EXPORT_SYMBOL(phy_set_max_speed); 238 239 void of_set_phy_supported(struct phy_device *phydev) 240 { 241 struct device_node *node = phydev->mdio.dev.of_node; 242 u32 max_speed; 243 244 if (!IS_ENABLED(CONFIG_OF_MDIO)) 245 return; 246 247 if (!node) 248 return; 249 250 if (!of_property_read_u32(node, "max-speed", &max_speed)) 251 __set_phy_supported(phydev, max_speed); 252 } 253 254 void of_set_phy_eee_broken(struct phy_device *phydev) 255 { 256 struct device_node *node = phydev->mdio.dev.of_node; 257 u32 broken = 0; 258 259 if (!IS_ENABLED(CONFIG_OF_MDIO)) 260 return; 261 262 if (!node) 263 return; 264 265 if (of_property_read_bool(node, "eee-broken-100tx")) 266 broken |= MDIO_EEE_100TX; 267 if (of_property_read_bool(node, "eee-broken-1000t")) 268 broken |= MDIO_EEE_1000T; 269 if (of_property_read_bool(node, "eee-broken-10gt")) 270 broken |= MDIO_EEE_10GT; 271 if (of_property_read_bool(node, "eee-broken-1000kx")) 272 broken |= MDIO_EEE_1000KX; 273 if (of_property_read_bool(node, "eee-broken-10gkx4")) 274 broken |= MDIO_EEE_10GKX4; 275 if (of_property_read_bool(node, "eee-broken-10gkr")) 276 broken |= MDIO_EEE_10GKR; 277 278 phydev->eee_broken_modes = broken; 279 } 280 281 /** 282 * phy_resolve_aneg_linkmode - resolve the advertisements into phy settings 283 * @phydev: The phy_device struct 284 * 285 * Resolve our and the link partner advertisements into their corresponding 286 * speed and duplex. If full duplex was negotiated, extract the pause mode 287 * from the link partner mask. 288 */ 289 void phy_resolve_aneg_linkmode(struct phy_device *phydev) 290 { 291 __ETHTOOL_DECLARE_LINK_MODE_MASK(common); 292 int i; 293 294 linkmode_and(common, phydev->lp_advertising, phydev->advertising); 295 296 for (i = 0; i < ARRAY_SIZE(settings); i++) 297 if (test_bit(settings[i].bit, common)) { 298 phydev->speed = settings[i].speed; 299 phydev->duplex = settings[i].duplex; 300 break; 301 } 302 303 if (phydev->duplex == DUPLEX_FULL) { 304 phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, 305 phydev->lp_advertising); 306 phydev->asym_pause = linkmode_test_bit( 307 ETHTOOL_LINK_MODE_Asym_Pause_BIT, 308 phydev->lp_advertising); 309 } 310 } 311 EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode); 312 313 static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad, 314 u16 regnum) 315 { 316 /* Write the desired MMD Devad */ 317 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad); 318 319 /* Write the desired MMD register address */ 320 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum); 321 322 /* Select the Function : DATA with no post increment */ 323 __mdiobus_write(bus, phy_addr, MII_MMD_CTRL, 324 devad | MII_MMD_CTRL_NOINCR); 325 } 326 327 /** 328 * __phy_read_mmd - Convenience function for reading a register 329 * from an MMD on a given PHY. 330 * @phydev: The phy_device struct 331 * @devad: The MMD to read from (0..31) 332 * @regnum: The register on the MMD to read (0..65535) 333 * 334 * Same rules as for __phy_read(); 335 */ 336 int __phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum) 337 { 338 int val; 339 340 if (regnum > (u16)~0 || devad > 32) 341 return -EINVAL; 342 343 if (phydev->drv->read_mmd) { 344 val = phydev->drv->read_mmd(phydev, devad, regnum); 345 } else if (phydev->is_c45) { 346 u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff); 347 348 val = __mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, addr); 349 } else { 350 struct mii_bus *bus = phydev->mdio.bus; 351 int phy_addr = phydev->mdio.addr; 352 353 mmd_phy_indirect(bus, phy_addr, devad, regnum); 354 355 /* Read the content of the MMD's selected register */ 356 val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA); 357 } 358 return val; 359 } 360 EXPORT_SYMBOL(__phy_read_mmd); 361 362 /** 363 * phy_read_mmd - Convenience function for reading a register 364 * from an MMD on a given PHY. 365 * @phydev: The phy_device struct 366 * @devad: The MMD to read from 367 * @regnum: The register on the MMD to read 368 * 369 * Same rules as for phy_read(); 370 */ 371 int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum) 372 { 373 int ret; 374 375 mutex_lock(&phydev->mdio.bus->mdio_lock); 376 ret = __phy_read_mmd(phydev, devad, regnum); 377 mutex_unlock(&phydev->mdio.bus->mdio_lock); 378 379 return ret; 380 } 381 EXPORT_SYMBOL(phy_read_mmd); 382 383 /** 384 * __phy_write_mmd - Convenience function for writing a register 385 * on an MMD on a given PHY. 386 * @phydev: The phy_device struct 387 * @devad: The MMD to read from 388 * @regnum: The register on the MMD to read 389 * @val: value to write to @regnum 390 * 391 * Same rules as for __phy_write(); 392 */ 393 int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val) 394 { 395 int ret; 396 397 if (regnum > (u16)~0 || devad > 32) 398 return -EINVAL; 399 400 if (phydev->drv->write_mmd) { 401 ret = phydev->drv->write_mmd(phydev, devad, regnum, val); 402 } else if (phydev->is_c45) { 403 u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff); 404 405 ret = __mdiobus_write(phydev->mdio.bus, phydev->mdio.addr, 406 addr, val); 407 } else { 408 struct mii_bus *bus = phydev->mdio.bus; 409 int phy_addr = phydev->mdio.addr; 410 411 mmd_phy_indirect(bus, phy_addr, devad, regnum); 412 413 /* Write the data into MMD's selected register */ 414 __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val); 415 416 ret = 0; 417 } 418 return ret; 419 } 420 EXPORT_SYMBOL(__phy_write_mmd); 421 422 /** 423 * phy_write_mmd - Convenience function for writing a register 424 * on an MMD on a given PHY. 425 * @phydev: The phy_device struct 426 * @devad: The MMD to read from 427 * @regnum: The register on the MMD to read 428 * @val: value to write to @regnum 429 * 430 * Same rules as for phy_write(); 431 */ 432 int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val) 433 { 434 int ret; 435 436 mutex_lock(&phydev->mdio.bus->mdio_lock); 437 ret = __phy_write_mmd(phydev, devad, regnum, val); 438 mutex_unlock(&phydev->mdio.bus->mdio_lock); 439 440 return ret; 441 } 442 EXPORT_SYMBOL(phy_write_mmd); 443 444 /** 445 * __phy_modify_changed() - Convenience function for modifying a PHY register 446 * @phydev: a pointer to a &struct phy_device 447 * @regnum: register number 448 * @mask: bit mask of bits to clear 449 * @set: bit mask of bits to set 450 * 451 * Unlocked helper function which allows a PHY register to be modified as 452 * new register value = (old register value & ~mask) | set 453 * 454 * Returns negative errno, 0 if there was no change, and 1 in case of change 455 */ 456 int __phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, 457 u16 set) 458 { 459 int new, ret; 460 461 ret = __phy_read(phydev, regnum); 462 if (ret < 0) 463 return ret; 464 465 new = (ret & ~mask) | set; 466 if (new == ret) 467 return 0; 468 469 ret = __phy_write(phydev, regnum, new); 470 471 return ret < 0 ? ret : 1; 472 } 473 EXPORT_SYMBOL_GPL(__phy_modify_changed); 474 475 /** 476 * phy_modify_changed - Function for modifying a PHY register 477 * @phydev: the phy_device struct 478 * @regnum: register number to modify 479 * @mask: bit mask of bits to clear 480 * @set: new value of bits set in mask to write to @regnum 481 * 482 * NOTE: MUST NOT be called from interrupt context, 483 * because the bus read/write functions may wait for an interrupt 484 * to conclude the operation. 485 * 486 * Returns negative errno, 0 if there was no change, and 1 in case of change 487 */ 488 int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set) 489 { 490 int ret; 491 492 mutex_lock(&phydev->mdio.bus->mdio_lock); 493 ret = __phy_modify_changed(phydev, regnum, mask, set); 494 mutex_unlock(&phydev->mdio.bus->mdio_lock); 495 496 return ret; 497 } 498 EXPORT_SYMBOL_GPL(phy_modify_changed); 499 500 /** 501 * __phy_modify - Convenience function for modifying a PHY register 502 * @phydev: the phy_device struct 503 * @regnum: register number to modify 504 * @mask: bit mask of bits to clear 505 * @set: new value of bits set in mask to write to @regnum 506 * 507 * NOTE: MUST NOT be called from interrupt context, 508 * because the bus read/write functions may wait for an interrupt 509 * to conclude the operation. 510 */ 511 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set) 512 { 513 int ret; 514 515 ret = __phy_modify_changed(phydev, regnum, mask, set); 516 517 return ret < 0 ? ret : 0; 518 } 519 EXPORT_SYMBOL_GPL(__phy_modify); 520 521 /** 522 * phy_modify - Convenience function for modifying a given PHY register 523 * @phydev: the phy_device struct 524 * @regnum: register number to write 525 * @mask: bit mask of bits to clear 526 * @set: new value of bits set in mask to write to @regnum 527 * 528 * NOTE: MUST NOT be called from interrupt context, 529 * because the bus read/write functions may wait for an interrupt 530 * to conclude the operation. 531 */ 532 int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set) 533 { 534 int ret; 535 536 mutex_lock(&phydev->mdio.bus->mdio_lock); 537 ret = __phy_modify(phydev, regnum, mask, set); 538 mutex_unlock(&phydev->mdio.bus->mdio_lock); 539 540 return ret; 541 } 542 EXPORT_SYMBOL_GPL(phy_modify); 543 544 /** 545 * __phy_modify_mmd_changed - Function for modifying a register on MMD 546 * @phydev: the phy_device struct 547 * @devad: the MMD containing register to modify 548 * @regnum: register number to modify 549 * @mask: bit mask of bits to clear 550 * @set: new value of bits set in mask to write to @regnum 551 * 552 * Unlocked helper function which allows a MMD register to be modified as 553 * new register value = (old register value & ~mask) | set 554 * 555 * Returns negative errno, 0 if there was no change, and 1 in case of change 556 */ 557 int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum, 558 u16 mask, u16 set) 559 { 560 int new, ret; 561 562 ret = __phy_read_mmd(phydev, devad, regnum); 563 if (ret < 0) 564 return ret; 565 566 new = (ret & ~mask) | set; 567 if (new == ret) 568 return 0; 569 570 ret = __phy_write_mmd(phydev, devad, regnum, new); 571 572 return ret < 0 ? ret : 1; 573 } 574 EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed); 575 576 /** 577 * phy_modify_mmd_changed - Function for modifying a register on MMD 578 * @phydev: the phy_device struct 579 * @devad: the MMD containing register to modify 580 * @regnum: register number to modify 581 * @mask: bit mask of bits to clear 582 * @set: new value of bits set in mask to write to @regnum 583 * 584 * NOTE: MUST NOT be called from interrupt context, 585 * because the bus read/write functions may wait for an interrupt 586 * to conclude the operation. 587 * 588 * Returns negative errno, 0 if there was no change, and 1 in case of change 589 */ 590 int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum, 591 u16 mask, u16 set) 592 { 593 int ret; 594 595 mutex_lock(&phydev->mdio.bus->mdio_lock); 596 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set); 597 mutex_unlock(&phydev->mdio.bus->mdio_lock); 598 599 return ret; 600 } 601 EXPORT_SYMBOL_GPL(phy_modify_mmd_changed); 602 603 /** 604 * __phy_modify_mmd - Convenience function for modifying a register on MMD 605 * @phydev: the phy_device struct 606 * @devad: the MMD containing register to modify 607 * @regnum: register number to modify 608 * @mask: bit mask of bits to clear 609 * @set: new value of bits set in mask to write to @regnum 610 * 611 * NOTE: MUST NOT be called from interrupt context, 612 * because the bus read/write functions may wait for an interrupt 613 * to conclude the operation. 614 */ 615 int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum, 616 u16 mask, u16 set) 617 { 618 int ret; 619 620 ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set); 621 622 return ret < 0 ? ret : 0; 623 } 624 EXPORT_SYMBOL_GPL(__phy_modify_mmd); 625 626 /** 627 * phy_modify_mmd - Convenience function for modifying a register on MMD 628 * @phydev: the phy_device struct 629 * @devad: the MMD containing register to modify 630 * @regnum: register number to modify 631 * @mask: bit mask of bits to clear 632 * @set: new value of bits set in mask to write to @regnum 633 * 634 * NOTE: MUST NOT be called from interrupt context, 635 * because the bus read/write functions may wait for an interrupt 636 * to conclude the operation. 637 */ 638 int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum, 639 u16 mask, u16 set) 640 { 641 int ret; 642 643 mutex_lock(&phydev->mdio.bus->mdio_lock); 644 ret = __phy_modify_mmd(phydev, devad, regnum, mask, set); 645 mutex_unlock(&phydev->mdio.bus->mdio_lock); 646 647 return ret; 648 } 649 EXPORT_SYMBOL_GPL(phy_modify_mmd); 650 651 static int __phy_read_page(struct phy_device *phydev) 652 { 653 return phydev->drv->read_page(phydev); 654 } 655 656 static int __phy_write_page(struct phy_device *phydev, int page) 657 { 658 return phydev->drv->write_page(phydev, page); 659 } 660 661 /** 662 * phy_save_page() - take the bus lock and save the current page 663 * @phydev: a pointer to a &struct phy_device 664 * 665 * Take the MDIO bus lock, and return the current page number. On error, 666 * returns a negative errno. phy_restore_page() must always be called 667 * after this, irrespective of success or failure of this call. 668 */ 669 int phy_save_page(struct phy_device *phydev) 670 { 671 mutex_lock(&phydev->mdio.bus->mdio_lock); 672 return __phy_read_page(phydev); 673 } 674 EXPORT_SYMBOL_GPL(phy_save_page); 675 676 /** 677 * phy_select_page() - take the bus lock, save the current page, and set a page 678 * @phydev: a pointer to a &struct phy_device 679 * @page: desired page 680 * 681 * Take the MDIO bus lock to protect against concurrent access, save the 682 * current PHY page, and set the current page. On error, returns a 683 * negative errno, otherwise returns the previous page number. 684 * phy_restore_page() must always be called after this, irrespective 685 * of success or failure of this call. 686 */ 687 int phy_select_page(struct phy_device *phydev, int page) 688 { 689 int ret, oldpage; 690 691 oldpage = ret = phy_save_page(phydev); 692 if (ret < 0) 693 return ret; 694 695 if (oldpage != page) { 696 ret = __phy_write_page(phydev, page); 697 if (ret < 0) 698 return ret; 699 } 700 701 return oldpage; 702 } 703 EXPORT_SYMBOL_GPL(phy_select_page); 704 705 /** 706 * phy_restore_page() - restore the page register and release the bus lock 707 * @phydev: a pointer to a &struct phy_device 708 * @oldpage: the old page, return value from phy_save_page() or phy_select_page() 709 * @ret: operation's return code 710 * 711 * Release the MDIO bus lock, restoring @oldpage if it is a valid page. 712 * This function propagates the earliest error code from the group of 713 * operations. 714 * 715 * Returns: 716 * @oldpage if it was a negative value, otherwise 717 * @ret if it was a negative errno value, otherwise 718 * phy_write_page()'s negative value if it were in error, otherwise 719 * @ret. 720 */ 721 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret) 722 { 723 int r; 724 725 if (oldpage >= 0) { 726 r = __phy_write_page(phydev, oldpage); 727 728 /* Propagate the operation return code if the page write 729 * was successful. 730 */ 731 if (ret >= 0 && r < 0) 732 ret = r; 733 } else { 734 /* Propagate the phy page selection error code */ 735 ret = oldpage; 736 } 737 738 mutex_unlock(&phydev->mdio.bus->mdio_lock); 739 740 return ret; 741 } 742 EXPORT_SYMBOL_GPL(phy_restore_page); 743 744 /** 745 * phy_read_paged() - Convenience function for reading a paged register 746 * @phydev: a pointer to a &struct phy_device 747 * @page: the page for the phy 748 * @regnum: register number 749 * 750 * Same rules as for phy_read(). 751 */ 752 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum) 753 { 754 int ret = 0, oldpage; 755 756 oldpage = phy_select_page(phydev, page); 757 if (oldpage >= 0) 758 ret = __phy_read(phydev, regnum); 759 760 return phy_restore_page(phydev, oldpage, ret); 761 } 762 EXPORT_SYMBOL(phy_read_paged); 763 764 /** 765 * phy_write_paged() - Convenience function for writing a paged register 766 * @phydev: a pointer to a &struct phy_device 767 * @page: the page for the phy 768 * @regnum: register number 769 * @val: value to write 770 * 771 * Same rules as for phy_write(). 772 */ 773 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val) 774 { 775 int ret = 0, oldpage; 776 777 oldpage = phy_select_page(phydev, page); 778 if (oldpage >= 0) 779 ret = __phy_write(phydev, regnum, val); 780 781 return phy_restore_page(phydev, oldpage, ret); 782 } 783 EXPORT_SYMBOL(phy_write_paged); 784 785 /** 786 * phy_modify_paged() - Convenience function for modifying a paged register 787 * @phydev: a pointer to a &struct phy_device 788 * @page: the page for the phy 789 * @regnum: register number 790 * @mask: bit mask of bits to clear 791 * @set: bit mask of bits to set 792 * 793 * Same rules as for phy_read() and phy_write(). 794 */ 795 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum, 796 u16 mask, u16 set) 797 { 798 int ret = 0, oldpage; 799 800 oldpage = phy_select_page(phydev, page); 801 if (oldpage >= 0) 802 ret = __phy_modify(phydev, regnum, mask, set); 803 804 return phy_restore_page(phydev, oldpage, ret); 805 } 806 EXPORT_SYMBOL(phy_modify_paged); 807