common/miiphyutil.c

   1 /*
   2  * (C) Copyright 2001
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * This provides a bit-banged interface to the ethernet MII management
  26  * channel.
  27  */
  28
  29 #include <common.h>
  30 #include <miiphy.h>
  31 #include <phy.h>
  32
  33 #include <asm/types.h>
  34 #include <linux/list.h>
  35 #include <malloc.h>
  36 #include <net.h>
  37
  38 /* local debug macro */
  39 #undef MII_DEBUG
  40
  41 #undef debug
  42 #ifdef MII_DEBUG
  43 #define debug(fmt, args...)     printf(fmt, ##args)
  44 #else
  45 #define debug(fmt, args...)
  46 #endif /* MII_DEBUG */
  47
  48 static struct list_head mii_devs;
  49 static struct mii_dev *current_mii;
  50
  51 /*
  52  * Lookup the mii_dev struct by the registered device name.
  53  */
  54 struct mii_dev *miiphy_get_dev_by_name(const char *devname)
  55 {
  56         struct list_head *entry;
  57         struct mii_dev *dev;
  58
  59         if (!devname) {
  60                 printf("NULL device name!\n");
  61                 return NULL;
  62         }
  63
  64         list_for_each(entry, &mii_devs) {
  65                 dev = list_entry(entry, struct mii_dev, link);
  66                 if (strcmp(dev->name, devname) == 0)
  67                         return dev;
  68         }
  69
  70         return NULL;
  71 }
  72
  73 /*****************************************************************************
  74  *
  75  * Initialize global data. Need to be called before any other miiphy routine.
  76  */
  77 void miiphy_init(void)
  78 {
  79         INIT_LIST_HEAD(&mii_devs);
  80         current_mii = NULL;
  81 }
  82
  83 static int legacy_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
  84 {
  85         unsigned short val;
  86         int ret;
  87         struct legacy_mii_dev *ldev = bus->priv;
  88
  89         ret = ldev->read(bus->name, addr, reg, &val);
  90
  91         return ret ? -1 : (int)val;
  92 }
  93
  94 static int legacy_miiphy_write(struct mii_dev *bus, int addr, int devad,
  95                                 int reg, u16 val)
  96 {
  97         struct legacy_mii_dev *ldev = bus->priv;
  98
  99         return ldev->write(bus->name, addr, reg, val);
 100 }
 101
 102 /*****************************************************************************
 103  *
 104  * Register read and write MII access routines for the device <name>.
 105  * This API is now deprecated. Please use mdio_alloc and mdio_register, instead.
 106  */
 107 void miiphy_register(const char *name,
 108                       int (*read)(const char *devname, unsigned char addr,
 109                                    unsigned char reg, unsigned short *value),
 110                       int (*write)(const char *devname, unsigned char addr,
 111                                     unsigned char reg, unsigned short value))
 112 {
 113         struct mii_dev *new_dev;
 114         struct legacy_mii_dev *ldev;
 115
 116         BUG_ON(strlen(name) >= MDIO_NAME_LEN);
 117
 118         /* check if we have unique name */
 119         new_dev = miiphy_get_dev_by_name(name);
 120         if (new_dev) {
 121                 printf("miiphy_register: non unique device name '%s'\n", name);
 122                 return;
 123         }
 124
 125         /* allocate memory */
 126         new_dev = mdio_alloc();
 127         ldev = malloc(sizeof(*ldev));
 128
 129         if (new_dev == NULL || ldev == NULL) {
 130                 printf("miiphy_register: cannot allocate memory for '%s'\n",
 131                         name);
 132                 return;
 133         }
 134
 135         /* initalize mii_dev struct fields */
 136         new_dev->read = legacy_miiphy_read;
 137         new_dev->write = legacy_miiphy_write;
 138         strncpy(new_dev->name, name, MDIO_NAME_LEN);
 139         new_dev->name[MDIO_NAME_LEN - 1] = 0;
 140         ldev->read = read;
 141         ldev->write = write;
 142         new_dev->priv = ldev;
 143
 144         debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
 145                new_dev->name, ldev->read, ldev->write);
 146
 147         /* add it to the list */
 148         list_add_tail(&new_dev->link, &mii_devs);
 149
 150         if (!current_mii)
 151                 current_mii = new_dev;
 152 }
 153
 154 struct mii_dev *mdio_alloc(void)
 155 {
 156         struct mii_dev *bus;
 157
 158         bus = malloc(sizeof(*bus));
 159         if (!bus)
 160                 return bus;
 161
 162         memset(bus, 0, sizeof(*bus));
 163
 164         /* initalize mii_dev struct fields */
 165         INIT_LIST_HEAD(&bus->link);
 166
 167         return bus;
 168 }
 169
 170 int mdio_register(struct mii_dev *bus)
 171 {
 172         if (!bus || !bus->name || !bus->read || !bus->write)
 173                 return -1;
 174
 175         /* check if we have unique name */
 176         if (miiphy_get_dev_by_name(bus->name)) {
 177                 printf("mdio_register: non unique device name '%s'\n",
 178                         bus->name);
 179                 return -1;
 180         }
 181
 182         /* add it to the list */
 183         list_add_tail(&bus->link, &mii_devs);
 184
 185         if (!current_mii)
 186                 current_mii = bus;
 187
 188         return 0;
 189 }
 190
 191 void mdio_list_devices(void)
 192 {
 193         struct list_head *entry;
 194
 195         list_for_each(entry, &mii_devs) {
 196                 int i;
 197                 struct mii_dev *bus = list_entry(entry, struct mii_dev, link);
 198
 199                 printf("%s:\n", bus->name);
 200
 201                 for (i = 0; i < PHY_MAX_ADDR; i++) {
 202                         struct phy_device *phydev = bus->phymap[i];
 203
 204                         if (phydev) {
 205                                 printf("%d - %s", i, phydev->drv->name);
 206
 207                                 if (phydev->dev)
 208                                         printf(" <--> %s\n", phydev->dev->name);
 209                                 else
 210                                         printf("\n");
 211                         }
 212                 }
 213         }
 214 }
 215
 216 int miiphy_set_current_dev(const char *devname)
 217 {
 218         struct mii_dev *dev;
 219
 220         dev = miiphy_get_dev_by_name(devname);
 221         if (dev) {
 222                 current_mii = dev;
 223                 return 0;
 224         }
 225
 226         printf("No such device: %s\n", devname);
 227
 228         return 1;
 229 }
 230
 231 struct mii_dev *mdio_get_current_dev(void)
 232 {
 233         return current_mii;
 234 }
 235
 236 struct phy_device *mdio_phydev_for_ethname(const char *ethname)
 237 {
 238         struct list_head *entry;
 239         struct mii_dev *bus;
 240
 241         list_for_each(entry, &mii_devs) {
 242                 int i;
 243                 bus = list_entry(entry, struct mii_dev, link);
 244
 245                 for (i = 0; i < PHY_MAX_ADDR; i++) {
 246                         if (!bus->phymap[i] || !bus->phymap[i]->dev)
 247                                 continue;
 248
 249                         if (strcmp(bus->phymap[i]->dev->name, ethname) == 0)
 250                                 return bus->phymap[i];
 251                 }
 252         }
 253
 254         printf("%s is not a known ethernet\n", ethname);
 255         return NULL;
 256 }
 257
 258 const char *miiphy_get_current_dev(void)
 259 {
 260         if (current_mii)
 261                 return current_mii->name;
 262
 263         return NULL;
 264 }
 265
 266 static struct mii_dev *miiphy_get_active_dev(const char *devname)
 267 {
 268         /* If the current mii is the one we want, return it */
 269         if (current_mii)
 270                 if (strcmp(current_mii->name, devname) == 0)
 271                         return current_mii;
 272
 273         /* Otherwise, set the active one to the one we want */
 274         if (miiphy_set_current_dev(devname))
 275                 return NULL;
 276         else
 277                 return current_mii;
 278 }
 279
 280 /*****************************************************************************
 281  *
 282  * Read to variable <value> from the PHY attached to device <devname>,
 283  * use PHY address <addr> and register <reg>.
 284  *
 285  * This API is deprecated. Use phy_read on a phy_device found via phy_connect
 286  *
 287  * Returns:
 288  *   0 on success
 289  */
 290 int miiphy_read(const char *devname, unsigned char addr, unsigned char reg,
 291                  unsigned short *value)
 292 {
 293         struct mii_dev *bus;
 294         int ret;
 295
 296         bus = miiphy_get_active_dev(devname);
 297         if (!bus)
 298                 return 1;
 299
 300         ret = bus->read(bus, addr, MDIO_DEVAD_NONE, reg);
 301         if (ret < 0)
 302                 return 1;
 303
 304         *value = (unsigned short)ret;
 305         return 0;
 306 }
 307
 308 /*****************************************************************************
 309  *
 310  * Write <value> to the PHY attached to device <devname>,
 311  * use PHY address <addr> and register <reg>.
 312  *
 313  * This API is deprecated. Use phy_write on a phy_device found by phy_connect
 314  *
 315  * Returns:
 316  *   0 on success
 317  */
 318 int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
 319                   unsigned short value)
 320 {
 321         struct mii_dev *bus;
 322
 323         bus = miiphy_get_active_dev(devname);
 324         if (bus)
 325                 return bus->write(bus, addr, MDIO_DEVAD_NONE, reg, value);
 326
 327         return 1;
 328 }
 329
 330 /*****************************************************************************
 331  *
 332  * Print out list of registered MII capable devices.
 333  */
 334 void miiphy_listdev(void)
 335 {
 336         struct list_head *entry;
 337         struct mii_dev *dev;
 338
 339         puts("MII devices: ");
 340         list_for_each(entry, &mii_devs) {
 341                 dev = list_entry(entry, struct mii_dev, link);
 342                 printf("'%s' ", dev->name);
 343         }
 344         puts("\n");
 345
 346         if (current_mii)
 347                 printf("Current device: '%s'\n", current_mii->name);
 348 }
 349
 350 /*****************************************************************************
 351  *
 352  * Read the OUI, manufacture's model number, and revision number.
 353  *
 354  * OUI:     22 bits (unsigned int)
 355  * Model:    6 bits (unsigned char)
 356  * Revision: 4 bits (unsigned char)
 357  *
 358  * This API is deprecated.
 359  *
 360  * Returns:
 361  *   0 on success
 362  */
 363 int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,
 364                  unsigned char *model, unsigned char *rev)
 365 {
 366         unsigned int reg = 0;
 367         unsigned short tmp;
 368
 369         if (miiphy_read(devname, addr, MII_PHYSID2, &tmp) != 0) {
 370                 debug("PHY ID register 2 read failed\n");
 371                 return -1;
 372         }
 373         reg = tmp;
 374
 375         debug("MII_PHYSID2 @ 0x%x = 0x%04x\n", addr, reg);
 376
 377         if (reg == 0xFFFF) {
 378                 /* No physical device present at this address */
 379                 return -1;
 380         }
 381
 382         if (miiphy_read(devname, addr, MII_PHYSID1, &tmp) != 0) {
 383                 debug("PHY ID register 1 read failed\n");
 384                 return -1;
 385         }
 386         reg |= tmp << 16;
 387         debug("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
 388
 389         *oui = (reg >> 10);
 390         *model = (unsigned char)((reg >> 4) & 0x0000003F);
 391         *rev = (unsigned char)(reg & 0x0000000F);
 392         return 0;
 393 }
 394
 395 #ifndef CONFIG_PHYLIB
 396 /*****************************************************************************
 397  *
 398  * Reset the PHY.
 399  *
 400  * This API is deprecated. Use PHYLIB.
 401  *
 402  * Returns:
 403  *   0 on success
 404  */
 405 int miiphy_reset(const char *devname, unsigned char addr)
 406 {
 407         unsigned short reg;
 408         int timeout = 500;
 409
 410         if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
 411                 debug("PHY status read failed\n");
 412                 return -1;
 413         }
 414         if (miiphy_write(devname, addr, MII_BMCR, reg | BMCR_RESET) != 0) {
 415                 debug("PHY reset failed\n");
 416                 return -1;
 417         }
 418 #ifdef CONFIG_PHY_RESET_DELAY
 419         udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
 420 #endif
 421         /*
 422          * Poll the control register for the reset bit to go to 0 (it is
 423          * auto-clearing).  This should happen within 0.5 seconds per the
 424          * IEEE spec.
 425          */
 426         reg = 0x8000;
 427         while (((reg & 0x8000) != 0) && timeout--) {
 428                 if (miiphy_read(devname, addr, MII_BMCR, &reg) != 0) {
 429                         debug("PHY status read failed\n");
 430                         return -1;
 431                 }
 432                 udelay(1000);
 433         }
 434         if ((reg & 0x8000) == 0) {
 435                 return 0;
 436         } else {
 437                 puts("PHY reset timed out\n");
 438                 return -1;
 439         }
 440         return 0;
 441 }
 442 #endif /* !PHYLIB */
 443
 444 /*****************************************************************************
 445  *
 446  * Determine the ethernet speed (10/100/1000).  Return 10 on error.
 447  */
 448 int miiphy_speed(const char *devname, unsigned char addr)
 449 {
 450         u16 bmcr, anlpar;
 451
 452 #if defined(CONFIG_PHY_GIGE)
 453         u16 btsr;
 454
 455         /*
 456          * Check for 1000BASE-X.  If it is supported, then assume that the speed
 457          * is 1000.
 458          */
 459         if (miiphy_is_1000base_x(devname, addr))
 460                 return _1000BASET;
 461
 462         /*
 463          * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
 464          */
 465         /* Check for 1000BASE-T. */
 466         if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
 467                 printf("PHY 1000BT status");
 468                 goto miiphy_read_failed;
 469         }
 470         if (btsr != 0xFFFF &&
 471                         (btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)))
 472                 return _1000BASET;
 473 #endif /* CONFIG_PHY_GIGE */
 474
 475         /* Check Basic Management Control Register first. */
 476         if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
 477                 printf("PHY speed");
 478                 goto miiphy_read_failed;
 479         }
 480         /* Check if auto-negotiation is on. */
 481         if (bmcr & BMCR_ANENABLE) {
 482                 /* Get auto-negotiation results. */
 483                 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
 484                         printf("PHY AN speed");
 485                         goto miiphy_read_failed;
 486                 }
 487                 return (anlpar & LPA_100) ? _100BASET : _10BASET;
 488         }
 489         /* Get speed from basic control settings. */
 490         return (bmcr & BMCR_SPEED100) ? _100BASET : _10BASET;
 491
 492 miiphy_read_failed:
 493         printf(" read failed, assuming 10BASE-T\n");
 494         return _10BASET;
 495 }
 496
 497 /*****************************************************************************
 498  *
 499  * Determine full/half duplex.  Return half on error.
 500  */
 501 int miiphy_duplex(const char *devname, unsigned char addr)
 502 {
 503         u16 bmcr, anlpar;
 504
 505 #if defined(CONFIG_PHY_GIGE)
 506         u16 btsr;
 507
 508         /* Check for 1000BASE-X. */
 509         if (miiphy_is_1000base_x(devname, addr)) {
 510                 /* 1000BASE-X */
 511                 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
 512                         printf("1000BASE-X PHY AN duplex");
 513                         goto miiphy_read_failed;
 514                 }
 515         }
 516         /*
 517          * No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
 518          */
 519         /* Check for 1000BASE-T. */
 520         if (miiphy_read(devname, addr, MII_STAT1000, &btsr)) {
 521                 printf("PHY 1000BT status");
 522                 goto miiphy_read_failed;
 523         }
 524         if (btsr != 0xFFFF) {
 525                 if (btsr & PHY_1000BTSR_1000FD) {
 526                         return FULL;
 527                 } else if (btsr & PHY_1000BTSR_1000HD) {
 528                         return HALF;
 529                 }
 530         }
 531 #endif /* CONFIG_PHY_GIGE */
 532
 533         /* Check Basic Management Control Register first. */
 534         if (miiphy_read(devname, addr, MII_BMCR, &bmcr)) {
 535                 puts("PHY duplex");
 536                 goto miiphy_read_failed;
 537         }
 538         /* Check if auto-negotiation is on. */
 539         if (bmcr & BMCR_ANENABLE) {
 540                 /* Get auto-negotiation results. */
 541                 if (miiphy_read(devname, addr, MII_LPA, &anlpar)) {
 542                         puts("PHY AN duplex");
 543                         goto miiphy_read_failed;
 544                 }
 545                 return (anlpar & (LPA_10FULL | LPA_100FULL)) ?
 546                     FULL : HALF;
 547         }
 548         /* Get speed from basic control settings. */
 549         return (bmcr & BMCR_FULLDPLX) ? FULL : HALF;
 550
 551 miiphy_read_failed:
 552         printf(" read failed, assuming half duplex\n");
 553         return HALF;
 554 }
 555
 556 /*****************************************************************************
 557  *
 558  * Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
 559  * 1000BASE-T, or on error.
 560  */
 561 int miiphy_is_1000base_x(const char *devname, unsigned char addr)
 562 {
 563 #if defined(CONFIG_PHY_GIGE)
 564         u16 exsr;
 565
 566         if (miiphy_read(devname, addr, MII_ESTATUS, &exsr)) {
 567                 printf("PHY extended status read failed, assuming no "
 568                         "1000BASE-X\n");
 569                 return 0;
 570         }
 571         return 0 != (exsr & (ESTATUS_1000XF | ESTATUS_1000XH));
 572 #else
 573         return 0;
 574 #endif
 575 }
 576
 577 #ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN
 578 /*****************************************************************************
 579  *
 580  * Determine link status
 581  */
 582 int miiphy_link(const char *devname, unsigned char addr)
 583 {
 584         unsigned short reg;
 585
 586         /* dummy read; needed to latch some phys */
 587         (void)miiphy_read(devname, addr, MII_BMSR, &reg);
 588         if (miiphy_read(devname, addr, MII_BMSR, &reg)) {
 589                 puts("MII_BMSR read failed, assuming no link\n");
 590                 return 0;
 591         }
 592
 593         /* Determine if a link is active */
 594         if ((reg & BMSR_LSTATUS) != 0) {
 595                 return 1;
 596         } else {
 597                 return 0;
 598         }
 599 }
 600 #endif