net/eth.c

   1 /*
   2  * (C) Copyright 2001-2015
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  * Joe Hershberger, National Instruments
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <net.h>
  13 #include <miiphy.h>
  14 #include <phy.h>
  15 #include <asm/errno.h>
  16 #include <dm/device-internal.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  21 {
  22         char *end;
  23         int i;
  24
  25         for (i = 0; i < 6; ++i) {
  26                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  27                 if (addr)
  28                         addr = (*end) ? end + 1 : end;
  29         }
  30 }
  31
  32 int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  33 {
  34         eth_parse_enetaddr(getenv(name), enetaddr);
  35         return is_valid_ethaddr(enetaddr);
  36 }
  37
  38 int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  39 {
  40         char buf[20];
  41
  42         sprintf(buf, "%pM", enetaddr);
  43
  44         return setenv(name, buf);
  45 }
  46
  47 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  48                                  uchar *enetaddr)
  49 {
  50         char enetvar[32];
  51         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  52         return eth_getenv_enetaddr(enetvar, enetaddr);
  53 }
  54
  55 static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  56                                  uchar *enetaddr)
  57 {
  58         char enetvar[32];
  59         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  60         return eth_setenv_enetaddr(enetvar, enetaddr);
  61 }
  62
  63 static void eth_env_init(void)
  64 {
  65         const char *s;
  66
  67         s = getenv("bootfile");
  68         if (s != NULL)
  69                 copy_filename(net_boot_file_name, s,
  70                               sizeof(net_boot_file_name));
  71 }
  72
  73 static int eth_mac_skip(int index)
  74 {
  75         char enetvar[15];
  76         char *skip_state;
  77
  78         sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  79         skip_state = getenv(enetvar);
  80         return skip_state != NULL;
  81 }
  82
  83 static void eth_current_changed(void);
  84
  85 /*
  86  * CPU and board-specific Ethernet initializations.  Aliased function
  87  * signals caller to move on
  88  */
  89 static int __def_eth_init(bd_t *bis)
  90 {
  91         return -1;
  92 }
  93 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  94 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  95
  96 static void eth_common_init(void)
  97 {
  98         bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
  99 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
 100         miiphy_init();
 101 #endif
 102
 103 #ifdef CONFIG_PHYLIB
 104         phy_init();
 105 #endif
 106
 107         eth_env_init();
 108
 109         /*
 110          * If board-specific initialization exists, call it.
 111          * If not, call a CPU-specific one
 112          */
 113         if (board_eth_init != __def_eth_init) {
 114                 if (board_eth_init(gd->bd) < 0)
 115                         printf("Board Net Initialization Failed\n");
 116         } else if (cpu_eth_init != __def_eth_init) {
 117                 if (cpu_eth_init(gd->bd) < 0)
 118                         printf("CPU Net Initialization Failed\n");
 119         } else {
 120                 printf("Net Initialization Skipped\n");
 121         }
 122 }
 123
 124 #ifdef CONFIG_DM_ETH
 125 /**
 126  * struct eth_device_priv - private structure for each Ethernet device
 127  *
 128  * @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
 129  */
 130 struct eth_device_priv {
 131         enum eth_state_t state;
 132 };
 133
 134 /**
 135  * struct eth_uclass_priv - The structure attached to the uclass itself
 136  *
 137  * @current: The Ethernet device that the network functions are using
 138  */
 139 struct eth_uclass_priv {
 140         struct udevice *current;
 141 };
 142
 143 /* eth_errno - This stores the most recent failure code from DM functions */
 144 static int eth_errno;
 145
 146 static struct eth_uclass_priv *eth_get_uclass_priv(void)
 147 {
 148         struct uclass *uc;
 149
 150         uclass_get(UCLASS_ETH, &uc);
 151         assert(uc);
 152         return uc->priv;
 153 }
 154
 155 static void eth_set_current_to_next(void)
 156 {
 157         struct eth_uclass_priv *uc_priv;
 158
 159         uc_priv = eth_get_uclass_priv();
 160         if (uc_priv->current)
 161                 uclass_next_device(&uc_priv->current);
 162         if (!uc_priv->current)
 163                 uclass_first_device(UCLASS_ETH, &uc_priv->current);
 164 }
 165
 166 /*
 167  * Typically this will simply return the active device.
 168  * In the case where the most recent active device was unset, this will attempt
 169  * to return the first device. If that device doesn't exist or fails to probe,
 170  * this function will return NULL.
 171  */
 172 struct udevice *eth_get_dev(void)
 173 {
 174         struct eth_uclass_priv *uc_priv;
 175
 176         uc_priv = eth_get_uclass_priv();
 177         if (!uc_priv->current)
 178                 eth_errno = uclass_first_device(UCLASS_ETH,
 179                                     &uc_priv->current);
 180         return uc_priv->current;
 181 }
 182
 183 /*
 184  * Typically this will just store a device pointer.
 185  * In case it was not probed, we will attempt to do so.
 186  * dev may be NULL to unset the active device.
 187  */
 188 static void eth_set_dev(struct udevice *dev)
 189 {
 190         if (dev && !device_active(dev))
 191                 eth_errno = device_probe(dev);
 192         eth_get_uclass_priv()->current = dev;
 193 }
 194
 195 /*
 196  * Find the udevice that either has the name passed in as devname or has an
 197  * alias named devname.
 198  */
 199 struct udevice *eth_get_dev_by_name(const char *devname)
 200 {
 201         int seq = -1;
 202         char *endp = NULL;
 203         const char *startp = NULL;
 204         struct udevice *it;
 205         struct uclass *uc;
 206
 207         /* Must be longer than 3 to be an alias */
 208         if (strlen(devname) > strlen("eth")) {
 209                 startp = devname + strlen("eth");
 210                 seq = simple_strtoul(startp, &endp, 10);
 211         }
 212
 213         uclass_get(UCLASS_ETH, &uc);
 214         uclass_foreach_dev(it, uc) {
 215                 /*
 216                  * We need the seq to be valid, so try to probe it.
 217                  * If the probe fails, the seq will not match since it will be
 218                  * -1 instead of what we are looking for.
 219                  * We don't care about errors from probe here. Either they won't
 220                  * match an alias or it will match a literal name and we'll pick
 221                  * up the error when we try to probe again in eth_set_dev().
 222                  */
 223                 device_probe(it);
 224                 /*
 225                  * Check for the name or the sequence number to match
 226                  */
 227                 if (strcmp(it->name, devname) == 0 ||
 228                     (endp > startp && it->seq == seq))
 229                         return it;
 230         }
 231
 232         return NULL;
 233 }
 234
 235 unsigned char *eth_get_ethaddr(void)
 236 {
 237         struct eth_pdata *pdata;
 238
 239         if (eth_get_dev()) {
 240                 pdata = eth_get_dev()->platdata;
 241                 return pdata->enetaddr;
 242         }
 243
 244         return NULL;
 245 }
 246
 247 /* Set active state without calling start on the driver */
 248 int eth_init_state_only(void)
 249 {
 250         struct udevice *current;
 251         struct eth_device_priv *priv;
 252
 253         current = eth_get_dev();
 254         if (!current || !device_active(current))
 255                 return -EINVAL;
 256
 257         priv = current->uclass_priv;
 258         priv->state = ETH_STATE_ACTIVE;
 259
 260         return 0;
 261 }
 262
 263 /* Set passive state without calling stop on the driver */
 264 void eth_halt_state_only(void)
 265 {
 266         struct udevice *current;
 267         struct eth_device_priv *priv;
 268
 269         current = eth_get_dev();
 270         if (!current || !device_active(current))
 271                 return;
 272
 273         priv = current->uclass_priv;
 274         priv->state = ETH_STATE_PASSIVE;
 275 }
 276
 277 int eth_get_dev_index(void)
 278 {
 279         if (eth_get_dev())
 280                 return eth_get_dev()->seq;
 281         return -1;
 282 }
 283
 284 static int eth_write_hwaddr(struct udevice *dev)
 285 {
 286         struct eth_pdata *pdata = dev->platdata;
 287         int ret = 0;
 288
 289         if (!dev || !device_active(dev))
 290                 return -EINVAL;
 291
 292         /* seq is valid since the device is active */
 293         if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
 294                 if (!is_valid_ethaddr(pdata->enetaddr)) {
 295                         printf("\nError: %s address %pM illegal value\n",
 296                                dev->name, pdata->enetaddr);
 297                         return -EINVAL;
 298                 }
 299
 300                 ret = eth_get_ops(dev)->write_hwaddr(dev);
 301                 if (ret)
 302                         printf("\nWarning: %s failed to set MAC address\n",
 303                                dev->name);
 304         }
 305
 306         return ret;
 307 }
 308
 309 int eth_init(void)
 310 {
 311         struct udevice *current;
 312         struct udevice *old_current;
 313         int ret = -ENODEV;
 314
 315         current = eth_get_dev();
 316         if (!current) {
 317                 printf("No ethernet found.\n");
 318                 return -ENODEV;
 319         }
 320
 321         old_current = current;
 322         do {
 323                 debug("Trying %s\n", current->name);
 324
 325                 if (device_active(current)) {
 326                         uchar env_enetaddr[6];
 327                         struct eth_pdata *pdata = current->platdata;
 328                         int enetaddr_changed = 0;
 329
 330                         /* Sync environment with network device */
 331                         if (eth_getenv_enetaddr_by_index("eth", current->seq,
 332                                                          env_enetaddr)) {
 333                                 enetaddr_changed = memcmp(pdata->enetaddr,
 334                                         env_enetaddr, 6);
 335                                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 336                         } else {
 337                                 memset(env_enetaddr, 0, 6);
 338                                 enetaddr_changed = memcmp(pdata->enetaddr,
 339                                         env_enetaddr, 6);
 340                                 memset(pdata->enetaddr, 0, 6);
 341                         }
 342                         if (enetaddr_changed)
 343                                 eth_write_hwaddr(current);
 344
 345                         ret = eth_get_ops(current)->start(current);
 346                         if (ret >= 0) {
 347                                 struct eth_device_priv *priv =
 348                                         current->uclass_priv;
 349
 350                                 priv->state = ETH_STATE_ACTIVE;
 351                                 return 0;
 352                         }
 353                 } else {
 354                         ret = eth_errno;
 355                 }
 356
 357                 debug("FAIL\n");
 358
 359                 /*
 360                  * If ethrotate is enabled, this will change "current",
 361                  * otherwise we will drop out of this while loop immediately
 362                  */
 363                 eth_try_another(0);
 364                 /* This will ensure the new "current" attempted to probe */
 365                 current = eth_get_dev();
 366         } while (old_current != current);
 367
 368         return ret;
 369 }
 370
 371 void eth_halt(void)
 372 {
 373         struct udevice *current;
 374         struct eth_device_priv *priv;
 375
 376         current = eth_get_dev();
 377         if (!current || !device_active(current))
 378                 return;
 379
 380         eth_get_ops(current)->stop(current);
 381         priv = current->uclass_priv;
 382         priv->state = ETH_STATE_PASSIVE;
 383 }
 384
 385 int eth_send(void *packet, int length)
 386 {
 387         struct udevice *current;
 388         int ret;
 389
 390         current = eth_get_dev();
 391         if (!current)
 392                 return -ENODEV;
 393
 394         if (!device_active(current))
 395                 return -EINVAL;
 396
 397         ret = eth_get_ops(current)->send(current, packet, length);
 398         if (ret < 0) {
 399                 /* We cannot completely return the error at present */
 400                 debug("%s: send() returned error %d\n", __func__, ret);
 401         }
 402         return ret;
 403 }
 404
 405 int eth_rx(void)
 406 {
 407         struct udevice *current;
 408         uchar *packet;
 409         int ret;
 410         int i;
 411
 412         current = eth_get_dev();
 413         if (!current)
 414                 return -ENODEV;
 415
 416         if (!device_active(current))
 417                 return -EINVAL;
 418
 419         /* Process up to 32 packets at one time */
 420         for (i = 0; i < 32; i++) {
 421                 ret = eth_get_ops(current)->recv(current, &packet);
 422                 if (ret > 0)
 423                         net_process_received_packet(packet, ret);
 424                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 425                         eth_get_ops(current)->free_pkt(current, packet, ret);
 426                 if (ret <= 0)
 427                         break;
 428         }
 429         if (ret == -EAGAIN)
 430                 ret = 0;
 431         if (ret < 0) {
 432                 /* We cannot completely return the error at present */
 433                 debug("%s: recv() returned error %d\n", __func__, ret);
 434         }
 435         return ret;
 436 }
 437
 438 int eth_initialize(void)
 439 {
 440         int num_devices = 0;
 441         struct udevice *dev;
 442
 443         eth_common_init();
 444
 445         /*
 446          * Devices need to write the hwaddr even if not started so that Linux
 447          * will have access to the hwaddr that u-boot stored for the device.
 448          * This is accomplished by attempting to probe each device and calling
 449          * their write_hwaddr() operation.
 450          */
 451         uclass_first_device(UCLASS_ETH, &dev);
 452         if (!dev) {
 453                 printf("No ethernet found.\n");
 454                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 455         } else {
 456                 char *ethprime = getenv("ethprime");
 457                 struct udevice *prime_dev = NULL;
 458
 459                 if (ethprime)
 460                         prime_dev = eth_get_dev_by_name(ethprime);
 461                 if (prime_dev) {
 462                         eth_set_dev(prime_dev);
 463                         eth_current_changed();
 464                 } else {
 465                         eth_set_dev(NULL);
 466                 }
 467
 468                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 469                 do {
 470                         if (num_devices)
 471                                 printf(", ");
 472
 473                         printf("eth%d: %s", dev->seq, dev->name);
 474
 475                         if (ethprime && dev == prime_dev)
 476                                 printf(" [PRIME]");
 477
 478                         eth_write_hwaddr(dev);
 479
 480                         uclass_next_device(&dev);
 481                         num_devices++;
 482                 } while (dev);
 483
 484                 putc('\n');
 485         }
 486
 487         return num_devices;
 488 }
 489
 490 static int eth_post_bind(struct udevice *dev)
 491 {
 492         if (strchr(dev->name, ' ')) {
 493                 printf("\nError: eth device name \"%s\" has a space!\n",
 494                        dev->name);
 495                 return -EINVAL;
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int eth_pre_unbind(struct udevice *dev)
 502 {
 503         /* Don't hang onto a pointer that is going away */
 504         if (dev == eth_get_uclass_priv()->current)
 505                 eth_set_dev(NULL);
 506
 507         return 0;
 508 }
 509
 510 static int eth_post_probe(struct udevice *dev)
 511 {
 512         struct eth_device_priv *priv = dev->uclass_priv;
 513         struct eth_pdata *pdata = dev->platdata;
 514         unsigned char env_enetaddr[6];
 515
 516         priv->state = ETH_STATE_INIT;
 517
 518         /* Check if the device has a MAC address in ROM */
 519         if (eth_get_ops(dev)->read_rom_hwaddr)
 520                 eth_get_ops(dev)->read_rom_hwaddr(dev);
 521
 522         eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
 523         if (!is_zero_ethaddr(env_enetaddr)) {
 524                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 525                     memcmp(pdata->enetaddr, env_enetaddr, 6)) {
 526                         printf("\nWarning: %s MAC addresses don't match:\n",
 527                                dev->name);
 528                         printf("Address in SROM is         %pM\n",
 529                                pdata->enetaddr);
 530                         printf("Address in environment is  %pM\n",
 531                                env_enetaddr);
 532                 }
 533
 534                 /* Override the ROM MAC address */
 535                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 536         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 537                 eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 538                 printf("\nWarning: %s using MAC address from ROM\n",
 539                        dev->name);
 540         } else if (is_zero_ethaddr(pdata->enetaddr)) {
 541                 printf("\nError: %s address not set.\n",
 542                        dev->name);
 543                 return -EINVAL;
 544         }
 545
 546         return 0;
 547 }
 548
 549 static int eth_pre_remove(struct udevice *dev)
 550 {
 551         eth_get_ops(dev)->stop(dev);
 552
 553         return 0;
 554 }
 555
 556 UCLASS_DRIVER(eth) = {
 557         .name           = "eth",
 558         .id             = UCLASS_ETH,
 559         .post_bind      = eth_post_bind,
 560         .pre_unbind     = eth_pre_unbind,
 561         .post_probe     = eth_post_probe,
 562         .pre_remove     = eth_pre_remove,
 563         .priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
 564         .per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 565         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 566 };
 567 #endif
 568
 569 #ifndef CONFIG_DM_ETH
 570
 571 #ifdef CONFIG_API
 572 static struct {
 573         uchar data[PKTSIZE];
 574         int length;
 575 } eth_rcv_bufs[PKTBUFSRX];
 576
 577 static unsigned int eth_rcv_current, eth_rcv_last;
 578 #endif
 579
 580 static struct eth_device *eth_devices;
 581 struct eth_device *eth_current;
 582
 583 static void eth_set_current_to_next(void)
 584 {
 585         eth_current = eth_current->next;
 586 }
 587
 588 static void eth_set_dev(struct eth_device *dev)
 589 {
 590         eth_current = dev;
 591 }
 592
 593 struct eth_device *eth_get_dev_by_name(const char *devname)
 594 {
 595         struct eth_device *dev, *target_dev;
 596
 597         BUG_ON(devname == NULL);
 598
 599         if (!eth_devices)
 600                 return NULL;
 601
 602         dev = eth_devices;
 603         target_dev = NULL;
 604         do {
 605                 if (strcmp(devname, dev->name) == 0) {
 606                         target_dev = dev;
 607                         break;
 608                 }
 609                 dev = dev->next;
 610         } while (dev != eth_devices);
 611
 612         return target_dev;
 613 }
 614
 615 struct eth_device *eth_get_dev_by_index(int index)
 616 {
 617         struct eth_device *dev, *target_dev;
 618
 619         if (!eth_devices)
 620                 return NULL;
 621
 622         dev = eth_devices;
 623         target_dev = NULL;
 624         do {
 625                 if (dev->index == index) {
 626                         target_dev = dev;
 627                         break;
 628                 }
 629                 dev = dev->next;
 630         } while (dev != eth_devices);
 631
 632         return target_dev;
 633 }
 634
 635 int eth_get_dev_index(void)
 636 {
 637         if (!eth_current)
 638                 return -1;
 639
 640         return eth_current->index;
 641 }
 642
 643 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 644                    int eth_number)
 645 {
 646         unsigned char env_enetaddr[6];
 647         int ret = 0;
 648
 649         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 650
 651         if (!is_zero_ethaddr(env_enetaddr)) {
 652                 if (!is_zero_ethaddr(dev->enetaddr) &&
 653                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
 654                         printf("\nWarning: %s MAC addresses don't match:\n",
 655                                dev->name);
 656                         printf("Address in SROM is         %pM\n",
 657                                dev->enetaddr);
 658                         printf("Address in environment is  %pM\n",
 659                                env_enetaddr);
 660                 }
 661
 662                 memcpy(dev->enetaddr, env_enetaddr, 6);
 663         } else if (is_valid_ethaddr(dev->enetaddr)) {
 664                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 665                                              dev->enetaddr);
 666                 printf("\nWarning: %s using MAC address from net device\n",
 667                        dev->name);
 668         } else if (is_zero_ethaddr(dev->enetaddr)) {
 669                 printf("\nError: %s address not set.\n",
 670                        dev->name);
 671                 return -EINVAL;
 672         }
 673
 674         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 675                 if (!is_valid_ethaddr(dev->enetaddr)) {
 676                         printf("\nError: %s address %pM illegal value\n",
 677                                dev->name, dev->enetaddr);
 678                         return -EINVAL;
 679                 }
 680
 681                 ret = dev->write_hwaddr(dev);
 682                 if (ret)
 683                         printf("\nWarning: %s failed to set MAC address\n",
 684                                dev->name);
 685         }
 686
 687         return ret;
 688 }
 689
 690 int eth_register(struct eth_device *dev)
 691 {
 692         struct eth_device *d;
 693         static int index;
 694
 695         assert(strlen(dev->name) < sizeof(dev->name));
 696
 697         if (!eth_devices) {
 698                 eth_devices = dev;
 699                 eth_current = dev;
 700                 eth_current_changed();
 701         } else {
 702                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 703                         ;
 704                 d->next = dev;
 705         }
 706
 707         dev->state = ETH_STATE_INIT;
 708         dev->next  = eth_devices;
 709         dev->index = index++;
 710
 711         return 0;
 712 }
 713
 714 int eth_unregister(struct eth_device *dev)
 715 {
 716         struct eth_device *cur;
 717
 718         /* No device */
 719         if (!eth_devices)
 720                 return -ENODEV;
 721
 722         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 723              cur = cur->next)
 724                 ;
 725
 726         /* Device not found */
 727         if (cur->next != dev)
 728                 return -ENODEV;
 729
 730         cur->next = dev->next;
 731
 732         if (eth_devices == dev)
 733                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 734
 735         if (eth_current == dev) {
 736                 eth_current = eth_devices;
 737                 eth_current_changed();
 738         }
 739
 740         return 0;
 741 }
 742
 743 int eth_initialize(void)
 744 {
 745         int num_devices = 0;
 746
 747         eth_devices = NULL;
 748         eth_current = NULL;
 749         eth_common_init();
 750
 751         if (!eth_devices) {
 752                 puts("No ethernet found.\n");
 753                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 754         } else {
 755                 struct eth_device *dev = eth_devices;
 756                 char *ethprime = getenv("ethprime");
 757
 758                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 759                 do {
 760                         if (dev->index)
 761                                 puts(", ");
 762
 763                         printf("%s", dev->name);
 764
 765                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 766                                 eth_current = dev;
 767                                 puts(" [PRIME]");
 768                         }
 769
 770                         if (strchr(dev->name, ' '))
 771                                 puts("\nWarning: eth device name has a space!"
 772                                         "\n");
 773
 774                         eth_write_hwaddr(dev, "eth", dev->index);
 775
 776                         dev = dev->next;
 777                         num_devices++;
 778                 } while (dev != eth_devices);
 779
 780                 eth_current_changed();
 781                 putc('\n');
 782         }
 783
 784         return num_devices;
 785 }
 786
 787 #ifdef CONFIG_MCAST_TFTP
 788 /* Multicast.
 789  * mcast_addr: multicast ipaddr from which multicast Mac is made
 790  * join: 1=join, 0=leave.
 791  */
 792 int eth_mcast_join(struct in_addr mcast_ip, int join)
 793 {
 794         u8 mcast_mac[6];
 795         if (!eth_current || !eth_current->mcast)
 796                 return -1;
 797         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 798         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 799         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 800         mcast_mac[2] = 0x5e;
 801         mcast_mac[1] = 0x0;
 802         mcast_mac[0] = 0x1;
 803         return eth_current->mcast(eth_current, mcast_mac, join);
 804 }
 805
 806 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 807  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 808  * some other adapter -- hash tables
 809  */
 810 #define CRCPOLY_LE 0xedb88320
 811 u32 ether_crc(size_t len, unsigned char const *p)
 812 {
 813         int i;
 814         u32 crc;
 815         crc = ~0;
 816         while (len--) {
 817                 crc ^= *p++;
 818                 for (i = 0; i < 8; i++)
 819                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 820         }
 821         /* an reverse the bits, cuz of way they arrive -- last-first */
 822         crc = (crc >> 16) | (crc << 16);
 823         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 824         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 825         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 826         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 827         return crc;
 828 }
 829
 830 #endif
 831
 832
 833 int eth_init(void)
 834 {
 835         struct eth_device *old_current, *dev;
 836
 837         if (!eth_current) {
 838                 puts("No ethernet found.\n");
 839                 return -ENODEV;
 840         }
 841
 842         /* Sync environment with network devices */
 843         dev = eth_devices;
 844         do {
 845                 uchar env_enetaddr[6];
 846                 int enetaddr_changed = 0;
 847
 848                 if (eth_getenv_enetaddr_by_index("eth", dev->index,
 849                                                  env_enetaddr)) {
 850                         enetaddr_changed = memcmp(dev->enetaddr,
 851                                 env_enetaddr, 6);
 852                         memcpy(dev->enetaddr, env_enetaddr, 6);
 853                 } else {
 854                         memset(env_enetaddr, 0, 6);
 855                         enetaddr_changed = memcmp(dev->enetaddr,
 856                                 env_enetaddr, 6);
 857                         memset(dev->enetaddr, 0, 6);
 858                 }
 859                 if (enetaddr_changed)
 860                         eth_write_hwaddr(dev, "eth", dev->index);
 861
 862                 dev = dev->next;
 863         } while (dev != eth_devices);
 864
 865         old_current = eth_current;
 866         do {
 867                 debug("Trying %s\n", eth_current->name);
 868
 869                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 870                         eth_current->state = ETH_STATE_ACTIVE;
 871
 872                         return 0;
 873                 }
 874                 debug("FAIL\n");
 875
 876                 eth_try_another(0);
 877         } while (old_current != eth_current);
 878
 879         return -ETIMEDOUT;
 880 }
 881
 882 void eth_halt(void)
 883 {
 884         if (!eth_current)
 885                 return;
 886
 887         eth_current->halt(eth_current);
 888
 889         eth_current->state = ETH_STATE_PASSIVE;
 890 }
 891
 892 int eth_send(void *packet, int length)
 893 {
 894         if (!eth_current)
 895                 return -ENODEV;
 896
 897         return eth_current->send(eth_current, packet, length);
 898 }
 899
 900 int eth_rx(void)
 901 {
 902         if (!eth_current)
 903                 return -ENODEV;
 904
 905         return eth_current->recv(eth_current);
 906 }
 907 #endif /* ifndef CONFIG_DM_ETH */
 908
 909 #ifdef CONFIG_API
 910 static void eth_save_packet(void *packet, int length)
 911 {
 912         char *p = packet;
 913         int i;
 914
 915         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 916                 return;
 917
 918         if (PKTSIZE < length)
 919                 return;
 920
 921         for (i = 0; i < length; i++)
 922                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 923
 924         eth_rcv_bufs[eth_rcv_last].length = length;
 925         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 926 }
 927
 928 int eth_receive(void *packet, int length)
 929 {
 930         char *p = packet;
 931         void *pp = push_packet;
 932         int i;
 933
 934         if (eth_rcv_current == eth_rcv_last) {
 935                 push_packet = eth_save_packet;
 936                 eth_rx();
 937                 push_packet = pp;
 938
 939                 if (eth_rcv_current == eth_rcv_last)
 940                         return -1;
 941         }
 942
 943         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 944
 945         for (i = 0; i < length; i++)
 946                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 947
 948         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 949         return length;
 950 }
 951 #endif /* CONFIG_API */
 952
 953 static void eth_current_changed(void)
 954 {
 955         char *act = getenv("ethact");
 956         /* update current ethernet name */
 957         if (eth_get_dev()) {
 958                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
 959                         setenv("ethact", eth_get_name());
 960         }
 961         /*
 962          * remove the variable completely if there is no active
 963          * interface
 964          */
 965         else if (act != NULL)
 966                 setenv("ethact", NULL);
 967 }
 968
 969 void eth_try_another(int first_restart)
 970 {
 971         static void *first_failed;
 972         char *ethrotate;
 973
 974         /*
 975          * Do not rotate between network interfaces when
 976          * 'ethrotate' variable is set to 'no'.
 977          */
 978         ethrotate = getenv("ethrotate");
 979         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
 980                 return;
 981
 982         if (!eth_get_dev())
 983                 return;
 984
 985         if (first_restart)
 986                 first_failed = eth_get_dev();
 987
 988         eth_set_current_to_next();
 989
 990         eth_current_changed();
 991
 992         if (first_failed == eth_get_dev())
 993                 net_restart_wrap = 1;
 994 }
 995
 996 void eth_set_current(void)
 997 {
 998         static char *act;
 999         static int  env_changed_id;
1000         int     env_id;
1001
1002         env_id = get_env_id();
1003         if ((act == NULL) || (env_changed_id != env_id)) {
1004                 act = getenv("ethact");
1005                 env_changed_id = env_id;
1006         }
1007
1008         if (act == NULL) {
1009                 char *ethprime = getenv("ethprime");
1010                 void *dev = NULL;
1011
1012                 if (ethprime)
1013                         dev = eth_get_dev_by_name(ethprime);
1014                 if (dev)
1015                         eth_set_dev(dev);
1016                 else
1017                         eth_set_dev(NULL);
1018         } else {
1019                 eth_set_dev(eth_get_dev_by_name(act));
1020         }
1021
1022         eth_current_changed();
1023 }
1024
1025 const char *eth_get_name(void)
1026 {
1027         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1028 }