drivers/net/phy/phy.c

   1 /*
   2  * Generic PHY Management code
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  *
   6  * Copyright 2011 Freescale Semiconductor, Inc.
   7  * author Andy Fleming
   8  *
   9  * Based loosely off of Linux's PHY Lib
  10  */
  11
  12 #include <config.h>
  13 #include <common.h>
  14 #include <malloc.h>
  15 #include <net.h>
  16 #include <command.h>
  17 #include <miiphy.h>
  18 #include <phy.h>
  19 #include <errno.h>
  20 #include <linux/err.h>
  21 #include <linux/compiler.h>
  22
  23 /* Generic PHY support and helper functions */
  24
  25 /**
  26  * genphy_config_advert - sanitize and advertise auto-negotation parameters
  27  * @phydev: target phy_device struct
  28  *
  29  * Description: Writes MII_ADVERTISE with the appropriate values,
  30  *   after sanitizing the values to make sure we only advertise
  31  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
  32  *   hasn't changed, and > 0 if it has changed.
  33  */
  34 static int genphy_config_advert(struct phy_device *phydev)
  35 {
  36         u32 advertise;
  37         int oldadv, adv;
  38         int err, changed = 0;
  39
  40         /* Only allow advertising what
  41          * this PHY supports */
  42         phydev->advertising &= phydev->supported;
  43         advertise = phydev->advertising;
  44
  45         /* Setup standard advertisement */
  46         oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
  47         if (adv < 0)
  48                 return adv;
  49
  50         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
  51                  ADVERTISE_PAUSE_ASYM);
  52         if (advertise & ADVERTISED_10baseT_Half)
  53                 adv |= ADVERTISE_10HALF;
  54         if (advertise & ADVERTISED_10baseT_Full)
  55                 adv |= ADVERTISE_10FULL;
  56         if (advertise & ADVERTISED_100baseT_Half)
  57                 adv |= ADVERTISE_100HALF;
  58         if (advertise & ADVERTISED_100baseT_Full)
  59                 adv |= ADVERTISE_100FULL;
  60         if (advertise & ADVERTISED_Pause)
  61                 adv |= ADVERTISE_PAUSE_CAP;
  62         if (advertise & ADVERTISED_Asym_Pause)
  63                 adv |= ADVERTISE_PAUSE_ASYM;
  64         if (advertise & ADVERTISED_1000baseX_Half)
  65                 adv |= ADVERTISE_1000XHALF;
  66         if (advertise & ADVERTISED_1000baseX_Full)
  67                 adv |= ADVERTISE_1000XFULL;
  68
  69         if (adv != oldadv) {
  70                 err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
  71
  72                 if (err < 0)
  73                         return err;
  74                 changed = 1;
  75         }
  76
  77         /* Configure gigabit if it's supported */
  78         if (phydev->supported & (SUPPORTED_1000baseT_Half |
  79                                 SUPPORTED_1000baseT_Full)) {
  80                 oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
  81                 if (adv < 0)
  82                         return adv;
  83
  84                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
  85                 if (advertise & SUPPORTED_1000baseT_Half)
  86                         adv |= ADVERTISE_1000HALF;
  87                 if (advertise & SUPPORTED_1000baseT_Full)
  88                         adv |= ADVERTISE_1000FULL;
  89
  90                 if (adv != oldadv) {
  91                         err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000,
  92                                         adv);
  93
  94                         if (err < 0)
  95                                 return err;
  96                         changed = 1;
  97                 }
  98         }
  99
 100         return changed;
 101 }
 102
 103
 104 /**
 105  * genphy_setup_forced - configures/forces speed/duplex from @phydev
 106  * @phydev: target phy_device struct
 107  *
 108  * Description: Configures MII_BMCR to force speed/duplex
 109  *   to the values in phydev. Assumes that the values are valid.
 110  */
 111 static int genphy_setup_forced(struct phy_device *phydev)
 112 {
 113         int ctl = 0;
 114
 115         phydev->pause = phydev->asym_pause = 0;
 116
 117         if (SPEED_1000 == phydev->speed)
 118                 ctl |= BMCR_SPEED1000;
 119         else if (SPEED_100 == phydev->speed)
 120                 ctl |= BMCR_SPEED100;
 121
 122         if (DUPLEX_FULL == phydev->duplex)
 123                 ctl |= BMCR_FULLDPLX;
 124
 125         return phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
 126 }
 127
 128
 129 /**
 130  * genphy_restart_aneg - Enable and Restart Autonegotiation
 131  * @phydev: target phy_device struct
 132  */
 133 int genphy_restart_aneg(struct phy_device *phydev)
 134 {
 135         int ctl;
 136
 137         ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 138         if (ctl < 0)
 139                 return ctl;
 140
 141         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 142
 143         /* Don't isolate the PHY if we're negotiating */
 144         ctl &= ~(BMCR_ISOLATE);
 145
 146         return phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
 147 }
 148
 149
 150 /**
 151  * genphy_config_aneg - restart auto-negotiation or write BMCR
 152  * @phydev: target phy_device struct
 153  *
 154  * Description: If auto-negotiation is enabled, we configure the
 155  *   advertising, and then restart auto-negotiation.  If it is not
 156  *   enabled, then we write the BMCR.
 157  */
 158 int genphy_config_aneg(struct phy_device *phydev)
 159 {
 160         int result;
 161
 162         if (AUTONEG_ENABLE != phydev->autoneg)
 163                 return genphy_setup_forced(phydev);
 164
 165         result = genphy_config_advert(phydev);
 166
 167         if (result < 0) /* error */
 168                 return result;
 169
 170         if (result == 0) {
 171                 /* Advertisment hasn't changed, but maybe aneg was never on to
 172                  * begin with?  Or maybe phy was isolated? */
 173                 int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 174
 175                 if (ctl < 0)
 176                         return ctl;
 177
 178                 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
 179                         result = 1; /* do restart aneg */
 180         }
 181
 182         /* Only restart aneg if we are advertising something different
 183          * than we were before.  */
 184         if (result > 0)
 185                 result = genphy_restart_aneg(phydev);
 186
 187         return result;
 188 }
 189
 190 /**
 191  * genphy_update_link - update link status in @phydev
 192  * @phydev: target phy_device struct
 193  *
 194  * Description: Update the value in phydev->link to reflect the
 195  *   current link value.  In order to do this, we need to read
 196  *   the status register twice, keeping the second value.
 197  */
 198 int genphy_update_link(struct phy_device *phydev)
 199 {
 200         int mii_reg;
 201         int bmcr;
 202
 203         /*
 204          * Wait if the link is up, and autonegotiation is in progress
 205          * (ie - we're capable and it's not done)
 206          */
 207         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 208         if (mii_reg < 0)
 209                 return mii_reg;
 210
 211         /*
 212          * If we already saw the link up, and it hasn't gone down, then
 213          * we don't need to wait for autoneg again
 214          */
 215         if (phydev->link && mii_reg & BMSR_LSTATUS)
 216                 return 0;
 217
 218         bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 219         if (bmcr < 0)
 220                 return bmcr;
 221
 222         if (!(bmcr & BMCR_ANENABLE))
 223                 return 0;
 224
 225         if ((mii_reg & BMSR_ANEGCAPABLE) && !(mii_reg & BMSR_ANEGCOMPLETE)) {
 226                 int i = 0;
 227
 228                 printf("%s Waiting for PHY auto negotiation to complete",
 229                         phydev->dev->name);
 230                 while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
 231                         /*
 232                          * Timeout reached ?
 233                          */
 234                         if (i > PHY_ANEG_TIMEOUT) {
 235                                 printf(" TIMEOUT !\n");
 236                                 phydev->link = 0;
 237                                 return 0;
 238                         }
 239
 240                         if (ctrlc()) {
 241                                 puts("user interrupt!\n");
 242                                 phydev->link = 0;
 243                                 return -EINTR;
 244                         }
 245
 246                         if ((i++ % 500) == 0)
 247                                 printf(".");
 248
 249                         udelay(1000);   /* 1 ms */
 250                         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 251                         if (mii_reg < 0)
 252                                 return mii_reg;
 253                 }
 254                 printf(" done\n");
 255                 phydev->link = 1;
 256         } else {
 257                 /* Read the link a second time to clear the latched state */
 258                 mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 259                 if (mii_reg < 0)
 260                         return mii_reg;
 261
 262                 if (mii_reg & BMSR_LSTATUS)
 263                         phydev->link = 1;
 264                 else
 265                         phydev->link = 0;
 266         }
 267
 268         return 0;
 269 }
 270
 271 /*
 272  * Generic function which updates the speed and duplex.  If
 273  * autonegotiation is enabled, it uses the AND of the link
 274  * partner's advertised capabilities and our advertised
 275  * capabilities.  If autonegotiation is disabled, we use the
 276  * appropriate bits in the control register.
 277  *
 278  * Stolen from Linux's mii.c and phy_device.c
 279  */
 280 int genphy_parse_link(struct phy_device *phydev)
 281 {
 282         int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 283
 284         if (mii_reg < 0)
 285                 return mii_reg;
 286
 287         /* We're using autonegotiation */
 288         if (phydev->supported & SUPPORTED_Autoneg) {
 289                 int ret;
 290                 u32 lpa = 0;
 291                 u32 gblpa = 0;
 292                 u32 estatus = 0;
 293
 294                 /* Check for gigabit capability */
 295                 if (phydev->supported & (SUPPORTED_1000baseT_Full |
 296                                         SUPPORTED_1000baseT_Half)) {
 297                         /* We want a list of states supported by
 298                          * both PHYs in the link
 299                          */
 300                         ret = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
 301                         if (ret < 0) {
 302                                 debug("Could not read MII_STAT1000. Ignoring gigabit capability\n");
 303                                 ret = 0;
 304                         }
 305                         gblpa = ret;
 306
 307                         ret = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
 308                         if (ret < 0)
 309                                 return ret;
 310                         gblpa &= ret << 2;
 311                 }
 312
 313                 /* Set the baseline so we only have to set them
 314                  * if they're different
 315                  */
 316                 phydev->speed = SPEED_10;
 317                 phydev->duplex = DUPLEX_HALF;
 318
 319                 /* Check the gigabit fields */
 320                 if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
 321                         phydev->speed = SPEED_1000;
 322
 323                         if (gblpa & PHY_1000BTSR_1000FD)
 324                                 phydev->duplex = DUPLEX_FULL;
 325
 326                         /* We're done! */
 327                         return 0;
 328                 }
 329
 330                 ret = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
 331                 if (ret < 0)
 332                         return ret;
 333                 lpa = ret;
 334
 335                 ret = phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
 336                 if (ret < 0)
 337                         return ret;
 338                 lpa &= ret;
 339
 340                 if (lpa & (LPA_100FULL | LPA_100HALF)) {
 341                         phydev->speed = SPEED_100;
 342
 343                         if (lpa & LPA_100FULL)
 344                                 phydev->duplex = DUPLEX_FULL;
 345
 346                 } else if (lpa & LPA_10FULL)
 347                         phydev->duplex = DUPLEX_FULL;
 348
 349                 /*
 350                  * Extended status may indicate that the PHY supports
 351                  * 1000BASE-T/X even though the 1000BASE-T registers
 352                  * are missing. In this case we can't tell whether the
 353                  * peer also supports it, so we only check extended
 354                  * status if the 1000BASE-T registers are actually
 355                  * missing.
 356                  */
 357                 if ((mii_reg & BMSR_ESTATEN) && !(mii_reg & BMSR_ERCAP))
 358                         estatus = phy_read(phydev, MDIO_DEVAD_NONE,
 359                                            MII_ESTATUS);
 360                 if (estatus < 0)
 361                         return estatus;
 362
 363                 if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_XHALF |
 364                                 ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) {
 365                         phydev->speed = SPEED_1000;
 366                         if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_TFULL))
 367                                 phydev->duplex = DUPLEX_FULL;
 368                 }
 369
 370         } else {
 371                 int bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 372
 373                 if (bmcr < 0)
 374                         return bmcr;
 375
 376                 phydev->speed = SPEED_10;
 377                 phydev->duplex = DUPLEX_HALF;
 378
 379                 if (bmcr & BMCR_FULLDPLX)
 380                         phydev->duplex = DUPLEX_FULL;
 381
 382                 if (bmcr & BMCR_SPEED1000)
 383                         phydev->speed = SPEED_1000;
 384                 else if (bmcr & BMCR_SPEED100)
 385                         phydev->speed = SPEED_100;
 386         }
 387
 388         return 0;
 389 }
 390
 391 int genphy_config(struct phy_device *phydev)
 392 {
 393         int val;
 394         u32 features;
 395
 396         /* For now, I'll claim that the generic driver supports
 397          * all possible port types */
 398         features = (SUPPORTED_TP | SUPPORTED_MII
 399                         | SUPPORTED_AUI | SUPPORTED_FIBRE |
 400                         SUPPORTED_BNC);
 401
 402         /* Do we support autonegotiation? */
 403         val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 404         if (val < 0)
 405                 return val;
 406
 407         if (val & BMSR_ANEGCAPABLE)
 408                 features |= SUPPORTED_Autoneg;
 409
 410         if (val & BMSR_100FULL)
 411                 features |= SUPPORTED_100baseT_Full;
 412         if (val & BMSR_100HALF)
 413                 features |= SUPPORTED_100baseT_Half;
 414         if (val & BMSR_10FULL)
 415                 features |= SUPPORTED_10baseT_Full;
 416         if (val & BMSR_10HALF)
 417                 features |= SUPPORTED_10baseT_Half;
 418
 419         if (val & BMSR_ESTATEN) {
 420                 val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
 421
 422                 if (val < 0)
 423                         return val;
 424
 425                 if (val & ESTATUS_1000_TFULL)
 426                         features |= SUPPORTED_1000baseT_Full;
 427                 if (val & ESTATUS_1000_THALF)
 428                         features |= SUPPORTED_1000baseT_Half;
 429                 if (val & ESTATUS_1000_XFULL)
 430                         features |= SUPPORTED_1000baseX_Full;
 431                 if (val & ESTATUS_1000_XHALF)
 432                         features |= SUPPORTED_1000baseX_Half;
 433         }
 434
 435         phydev->supported = features;
 436         phydev->advertising = features;
 437
 438         genphy_config_aneg(phydev);
 439
 440         return 0;
 441 }
 442
 443 int genphy_startup(struct phy_device *phydev)
 444 {
 445         genphy_update_link(phydev);
 446         genphy_parse_link(phydev);
 447
 448         return 0;
 449 }
 450
 451 int genphy_shutdown(struct phy_device *phydev)
 452 {
 453         return 0;
 454 }
 455
 456 static struct phy_driver genphy_driver = {
 457         .uid            = 0xffffffff,
 458         .mask           = 0xffffffff,
 459         .name           = "Generic PHY",
 460         .features       = 0,
 461         .config         = genphy_config,
 462         .startup        = genphy_startup,
 463         .shutdown       = genphy_shutdown,
 464 };
 465
 466 static LIST_HEAD(phy_drivers);
 467
 468 int phy_init(void)
 469 {
 470 #ifdef CONFIG_PHY_ATHEROS
 471         phy_atheros_init();
 472 #endif
 473 #ifdef CONFIG_PHY_BROADCOM
 474         phy_broadcom_init();
 475 #endif
 476 #ifdef CONFIG_PHY_CORTINA
 477         phy_cortina_init();
 478 #endif
 479 #ifdef CONFIG_PHY_DAVICOM
 480         phy_davicom_init();
 481 #endif
 482 #ifdef CONFIG_PHY_ET1011C
 483         phy_et1011c_init();
 484 #endif
 485 #ifdef CONFIG_PHY_LXT
 486         phy_lxt_init();
 487 #endif
 488 #ifdef CONFIG_PHY_MARVELL
 489         phy_marvell_init();
 490 #endif
 491 #ifdef CONFIG_PHY_MICREL
 492         phy_micrel_init();
 493 #endif
 494 #ifdef CONFIG_PHY_NATSEMI
 495         phy_natsemi_init();
 496 #endif
 497 #ifdef CONFIG_PHY_REALTEK
 498         phy_realtek_init();
 499 #endif
 500 #ifdef CONFIG_PHY_SMSC
 501         phy_smsc_init();
 502 #endif
 503 #ifdef CONFIG_PHY_TERANETICS
 504         phy_teranetics_init();
 505 #endif
 506 #ifdef CONFIG_PHY_VITESSE
 507         phy_vitesse_init();
 508 #endif
 509
 510         return 0;
 511 }
 512
 513 int phy_register(struct phy_driver *drv)
 514 {
 515         INIT_LIST_HEAD(&drv->list);
 516         list_add_tail(&drv->list, &phy_drivers);
 517
 518         return 0;
 519 }
 520
 521 static int phy_probe(struct phy_device *phydev)
 522 {
 523         int err = 0;
 524
 525         phydev->advertising = phydev->supported = phydev->drv->features;
 526         phydev->mmds = phydev->drv->mmds;
 527
 528         if (phydev->drv->probe)
 529                 err = phydev->drv->probe(phydev);
 530
 531         return err;
 532 }
 533
 534 static struct phy_driver *generic_for_interface(phy_interface_t interface)
 535 {
 536 #ifdef CONFIG_PHYLIB_10G
 537         if (is_10g_interface(interface))
 538                 return &gen10g_driver;
 539 #endif
 540
 541         return &genphy_driver;
 542 }
 543
 544 static struct phy_driver *get_phy_driver(struct phy_device *phydev,
 545                                 phy_interface_t interface)
 546 {
 547         struct list_head *entry;
 548         int phy_id = phydev->phy_id;
 549         struct phy_driver *drv = NULL;
 550
 551         list_for_each(entry, &phy_drivers) {
 552                 drv = list_entry(entry, struct phy_driver, list);
 553                 if ((drv->uid & drv->mask) == (phy_id & drv->mask))
 554                         return drv;
 555         }
 556
 557         /* If we made it here, there's no driver for this PHY */
 558         return generic_for_interface(interface);
 559 }
 560
 561 static int aneg_enabled(struct phy_device *phydev)
 562 {
 563         static const char *aneg = "_aneg";
 564         char varname[strlen(phydev->bus->name) + strlen(aneg) + 1];
 565
 566         snprintf(varname, sizeof(varname), "%s%s", phydev->bus->name, aneg);
 567         return getenv_yesno(varname);
 568 }
 569
 570 static int phy_get_speed(struct phy_device *phydev)
 571 {
 572         int ret;
 573         static const char *aneg = "_speed";
 574         char varname[strlen(phydev->bus->name) + strlen(aneg) + 1];
 575         ulong val;
 576
 577         snprintf(varname, sizeof(varname), "%s%s", phydev->bus->name, aneg);
 578
 579         val = getenv_ulong(varname, 10, 100);
 580         switch (val) {
 581         case 1000:
 582                 ret = SPEED_1000;
 583                 break;
 584         case 100:
 585                 ret = SPEED_100;
 586                 break;
 587         case 10:
 588                 ret = SPEED_10;
 589                 break;
 590         default:
 591                 printf("Improper setting '%s' for %s; assuming 100\n",
 592                         getenv(varname), varname);
 593                 ret = SPEED_100;
 594         }
 595         return ret;
 596 }
 597
 598 static int phy_get_duplex(struct phy_device *phydev)
 599 {
 600         int ret = DUPLEX_FULL;
 601         static const char *aneg = "_duplex";
 602         char varname[strlen(phydev->bus->name) + strlen(aneg) + 4];
 603         const char *val;
 604
 605         snprintf(varname, sizeof(varname), "%s%d%s",
 606                 phydev->bus->name, phydev->addr, aneg);
 607
 608         val = getenv(varname);
 609         if (val != NULL) {
 610                 if (strcasecmp(val, "full") != 0) {
 611                         if (strcasecmp(val, "half") == 0) {
 612                                 ret = DUPLEX_HALF;
 613                         } else {
 614                                 printf("Improper setting '%s' for %s; assuming 'full'\n",
 615                                         val, varname);
 616                                 printf("Expected one of: 'full', 'half'\n");
 617                         }
 618                 }
 619         }
 620
 621         return ret;
 622 }
 623
 624 static struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
 625                                             int phy_id,
 626                                             phy_interface_t interface)
 627 {
 628         struct phy_device *dev;
 629
 630         /* We allocate the device, and initialize the
 631          * default values */
 632         dev = malloc(sizeof(*dev));
 633         if (!dev) {
 634                 printf("Failed to allocate PHY device for %s:%d\n",
 635                         bus->name, addr);
 636                 return NULL;
 637         }
 638
 639         memset(dev, 0, sizeof(*dev));
 640
 641         dev->duplex = -1;
 642         dev->link = 1;
 643         dev->interface = interface;
 644
 645         dev->addr = addr;
 646         dev->phy_id = phy_id;
 647         dev->bus = bus;
 648
 649         dev->drv = get_phy_driver(dev, interface);
 650
 651         if (aneg_enabled(dev)) {
 652                 dev->autoneg = AUTONEG_ENABLE;
 653         } else {
 654                 dev->autoneg = AUTONEG_DISABLE;
 655                 dev->speed = phy_get_speed(dev);
 656                 dev->duplex = phy_get_duplex(dev);
 657
 658                 switch (dev->speed) {
 659                 case SPEED_1000:
 660                         if (dev->duplex == DUPLEX_FULL)
 661                                 dev->supported &= SUPPORTED_1000baseT_Full;
 662                         else
 663                                 dev->supported &= SUPPORTED_1000baseT_Half;
 664                         break;
 665                 case SPEED_100:
 666                         if (dev->duplex == DUPLEX_FULL)
 667                                 dev->supported &= SUPPORTED_100baseT_Full;
 668                         else
 669                                 dev->supported &= SUPPORTED_100baseT_Half;
 670                         break;
 671                 case SPEED_10:
 672                         if (dev->duplex == DUPLEX_FULL)
 673                                 dev->supported &= SUPPORTED_10baseT_Full;
 674                         else
 675                                 dev->supported &= SUPPORTED_10baseT_Half;
 676                         break;
 677                 default:
 678                         printf("Unsupported speed: %d\n", dev->speed);
 679                 }
 680         }
 681
 682         phy_probe(dev);
 683
 684         bus->phymap[addr] = dev;
 685
 686         return dev;
 687 }
 688
 689 /**
 690  * get_phy_id - reads the specified addr for its ID.
 691  * @bus: the target MII bus
 692  * @addr: PHY address on the MII bus
 693  * @phy_id: where to store the ID retrieved.
 694  *
 695  * Description: Reads the ID registers of the PHY at @addr on the
 696  *   @bus, stores it in @phy_id and returns zero on success.
 697  */
 698 static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
 699 {
 700         int phy_reg;
 701
 702         /* Grab the bits from PHYIR1, and put them
 703          * in the upper half */
 704         phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
 705
 706         if (phy_reg < 0)
 707                 return -EIO;
 708
 709         *phy_id = (phy_reg & 0xffff) << 16;
 710
 711         /* Grab the bits from PHYIR2, and put them in the lower half */
 712         phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
 713
 714         if (phy_reg < 0)
 715                 return -EIO;
 716
 717         *phy_id |= (phy_reg & 0xffff);
 718
 719         return 0;
 720 }
 721
 722 static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
 723                 unsigned phy_mask, int devad, phy_interface_t interface)
 724 {
 725         u32 phy_id = 0xffffffff;
 726         while (phy_mask) {
 727                 int addr = ffs(phy_mask) - 1;
 728                 int r = get_phy_id(bus, addr, devad, &phy_id);
 729                 /* If the PHY ID is mostly f's, we didn't find anything */
 730                 if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff)
 731                         return phy_device_create(bus, addr, phy_id, interface);
 732                 phy_mask &= ~(1 << addr);
 733         }
 734         return NULL;
 735 }
 736
 737 static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
 738                 unsigned phy_mask, phy_interface_t interface)
 739 {
 740         /* If we have one, return the existing device, with new interface */
 741         while (phy_mask) {
 742                 int addr = ffs(phy_mask) - 1;
 743                 if (bus->phymap[addr]) {
 744                         bus->phymap[addr]->interface = interface;
 745                         return bus->phymap[addr];
 746                 }
 747                 phy_mask &= ~(1 << addr);
 748         }
 749         return NULL;
 750 }
 751
 752 static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
 753                 unsigned phy_mask, phy_interface_t interface)
 754 {
 755         int i;
 756         struct phy_device *phydev;
 757
 758         phydev = search_for_existing_phy(bus, phy_mask, interface);
 759         if (phydev)
 760                 return phydev;
 761         /* Try Standard (ie Clause 22) access */
 762         /* Otherwise we have to try Clause 45 */
 763         for (i = 0; i < 5; i++) {
 764                 phydev = create_phy_by_mask(bus, phy_mask,
 765                                 i ? i : MDIO_DEVAD_NONE, interface);
 766                 if (IS_ERR(phydev))
 767                         return NULL;
 768                 if (phydev)
 769                         return phydev;
 770         }
 771         printf("Phy %d not found\n", ffs(phy_mask) - 1);
 772         return phy_device_create(bus, ffs(phy_mask) - 1, 0xffffffff, interface);
 773 }
 774
 775 /**
 776  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
 777  * @bus: the target MII bus
 778  * @addr: PHY address on the MII bus
 779  *
 780  * Description: Reads the ID registers of the PHY at @addr on the
 781  *   @bus, then allocates and returns the phy_device to represent it.
 782  */
 783 static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
 784                                          phy_interface_t interface)
 785 {
 786         return get_phy_device_by_mask(bus, 1 << addr, interface);
 787 }
 788
 789 int phy_reset(struct phy_device *phydev)
 790 {
 791         int err;
 792         int reg;
 793         int timeout = 500;
 794         int devad = MDIO_DEVAD_NONE;
 795
 796 #ifdef CONFIG_PHYLIB_10G
 797         /* If it's 10G, we need to issue reset through one of the MMDs */
 798         if (is_10g_interface(phydev->interface)) {
 799                 if (!phydev->mmds)
 800                         gen10g_discover_mmds(phydev);
 801
 802                 devad = ffs(phydev->mmds) - 1;
 803         }
 804 #endif
 805
 806         reg = phy_read(phydev, devad, MII_BMCR);
 807         if (reg < 0) {
 808                 debug("PHY status read failed\n");
 809                 return -1;
 810         }
 811
 812         reg |= BMCR_RESET;
 813
 814         err = phy_write(phydev, devad, MII_BMCR, reg);
 815         if (err < 0) {
 816                 debug("PHY reset failed\n");
 817                 return err;
 818         }
 819
 820 #ifdef CONFIG_PHY_RESET_DELAY
 821         udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
 822 #endif
 823         /*
 824          * Poll the control register for the reset bit to go to 0 (it is
 825          * auto-clearing).  This should happen within 0.5 seconds per the
 826          * IEEE spec.
 827          */
 828         while ((reg & BMCR_RESET) && timeout-- >= 0) {
 829                 reg = phy_read(phydev, devad, MII_BMCR);
 830
 831                 if (reg < 0) {
 832                         debug("PHY status read failed\n");
 833                         return reg;
 834                 }
 835                 udelay(1000);
 836         }
 837
 838         if (reg & BMCR_RESET) {
 839                 puts("PHY reset timed out\n");
 840                 return -ETIMEDOUT;
 841         }
 842
 843         return 0;
 844 }
 845
 846 int miiphy_reset(const char *devname, unsigned char addr)
 847 {
 848         struct mii_dev *bus = miiphy_get_dev_by_name(devname);
 849         struct phy_device *phydev;
 850
 851         /*
 852          * miiphy_reset was only used on standard PHYs, so we'll fake it here.
 853          * If later code tries to connect with the right interface, this will
 854          * be corrected by get_phy_device in phy_connect()
 855          */
 856         phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
 857
 858         return phy_reset(phydev);
 859 }
 860
 861 struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
 862                 phy_interface_t interface)
 863 {
 864         /* Reset the bus */
 865         if (bus->reset)
 866                 bus->reset(bus);
 867
 868         /* Wait 15ms to make sure the PHY has come out of hard reset */
 869         udelay(15000);
 870         return get_phy_device_by_mask(bus, phy_mask, interface);
 871 }
 872
 873 void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
 874 {
 875         /* Soft Reset the PHY */
 876         phy_reset(phydev);
 877         if (phydev->dev) {
 878                 printf("%s:%d is connected to %s.  Reconnecting to %s\n",
 879                                 phydev->bus->name, phydev->addr,
 880                                 phydev->dev->name, dev->name);
 881         }
 882         phydev->dev = dev;
 883         debug("%s connected to %s\n", dev->name, phydev->drv->name);
 884 }
 885
 886 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 887                 struct eth_device *dev, phy_interface_t interface)
 888 {
 889         struct phy_device *phydev;
 890
 891         phydev = phy_find_by_mask(bus, 1 << addr, interface);
 892         if (phydev)
 893                 phy_connect_dev(phydev, dev);
 894         else
 895                 printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
 896         return phydev;
 897 }
 898
 899 /*
 900  * Start the PHY.  Returns 0 on success, or a negative error code.
 901  */
 902 int phy_startup(struct phy_device *phydev)
 903 {
 904         if (phydev->drv->startup)
 905                 return phydev->drv->startup(phydev);
 906
 907         return 0;
 908 }
 909
 910 __weak int board_phy_config(struct phy_device *phydev)
 911 {
 912         if (phydev->drv->config)
 913                 return phydev->drv->config(phydev);
 914         return 0;
 915 }
 916
 917 int phy_config(struct phy_device *phydev)
 918 {
 919         /* Invoke an optional board-specific helper */
 920         board_phy_config(phydev);
 921
 922         return 0;
 923 }
 924
 925 int phy_shutdown(struct phy_device *phydev)
 926 {
 927         if (phydev->drv->shutdown)
 928                 phydev->drv->shutdown(phydev);
 929
 930         return 0;
 931 }