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 <environment.h>
  13 #include <net.h>
  14 #include <miiphy.h>
  15 #include <phy.h>
  16 #include <asm/errno.h>
  17 #include <dm/device-internal.h>
  18 #include <dm/uclass-internal.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  23 {
  24         char *end;
  25         int i;
  26
  27         for (i = 0; i < 6; ++i) {
  28                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  29                 if (addr)
  30                         addr = (*end) ? end + 1 : end;
  31         }
  32 }
  33
  34 int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  35 {
  36         eth_parse_enetaddr(getenv(name), enetaddr);
  37         return is_valid_ethaddr(enetaddr);
  38 }
  39
  40 int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  41 {
  42         char buf[20];
  43
  44         sprintf(buf, "%pM", enetaddr);
  45
  46         return setenv(name, buf);
  47 }
  48
  49 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  50                                  uchar *enetaddr)
  51 {
  52         char enetvar[32];
  53         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  54         return eth_getenv_enetaddr(enetvar, enetaddr);
  55 }
  56
  57 static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  58                                  uchar *enetaddr)
  59 {
  60         char enetvar[32];
  61         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  62         return eth_setenv_enetaddr(enetvar, enetaddr);
  63 }
  64
  65 static int eth_mac_skip(int index)
  66 {
  67         char enetvar[15];
  68         char *skip_state;
  69
  70         sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  71         skip_state = getenv(enetvar);
  72         return skip_state != NULL;
  73 }
  74
  75 static void eth_current_changed(void);
  76
  77 /*
  78  * CPU and board-specific Ethernet initializations.  Aliased function
  79  * signals caller to move on
  80  */
  81 static int __def_eth_init(bd_t *bis)
  82 {
  83         return -1;
  84 }
  85 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  86 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  87
  88 static void eth_common_init(void)
  89 {
  90         bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
  91 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
  92         miiphy_init();
  93 #endif
  94
  95 #ifdef CONFIG_PHYLIB
  96         phy_init();
  97 #endif
  98
  99         /*
 100          * If board-specific initialization exists, call it.
 101          * If not, call a CPU-specific one
 102          */
 103         if (board_eth_init != __def_eth_init) {
 104                 if (board_eth_init(gd->bd) < 0)
 105                         printf("Board Net Initialization Failed\n");
 106         } else if (cpu_eth_init != __def_eth_init) {
 107                 if (cpu_eth_init(gd->bd) < 0)
 108                         printf("CPU Net Initialization Failed\n");
 109         } else {
 110 #ifndef CONFIG_DM_ETH
 111                 printf("Net Initialization Skipped\n");
 112 #endif
 113         }
 114 }
 115
 116 #ifdef CONFIG_DM_ETH
 117 /**
 118  * struct eth_device_priv - private structure for each Ethernet device
 119  *
 120  * @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
 121  */
 122 struct eth_device_priv {
 123         enum eth_state_t state;
 124 };
 125
 126 /**
 127  * struct eth_uclass_priv - The structure attached to the uclass itself
 128  *
 129  * @current: The Ethernet device that the network functions are using
 130  */
 131 struct eth_uclass_priv {
 132         struct udevice *current;
 133 };
 134
 135 /* eth_errno - This stores the most recent failure code from DM functions */
 136 static int eth_errno;
 137
 138 static struct eth_uclass_priv *eth_get_uclass_priv(void)
 139 {
 140         struct uclass *uc;
 141
 142         uclass_get(UCLASS_ETH, &uc);
 143         assert(uc);
 144         return uc->priv;
 145 }
 146
 147 static void eth_set_current_to_next(void)
 148 {
 149         struct eth_uclass_priv *uc_priv;
 150
 151         uc_priv = eth_get_uclass_priv();
 152         if (uc_priv->current)
 153                 uclass_next_device(&uc_priv->current);
 154         if (!uc_priv->current)
 155                 uclass_first_device(UCLASS_ETH, &uc_priv->current);
 156 }
 157
 158 /*
 159  * Typically this will simply return the active device.
 160  * In the case where the most recent active device was unset, this will attempt
 161  * to return the first device. If that device doesn't exist or fails to probe,
 162  * this function will return NULL.
 163  */
 164 struct udevice *eth_get_dev(void)
 165 {
 166         struct eth_uclass_priv *uc_priv;
 167
 168         uc_priv = eth_get_uclass_priv();
 169         if (!uc_priv->current)
 170                 eth_errno = uclass_first_device(UCLASS_ETH,
 171                                     &uc_priv->current);
 172         return uc_priv->current;
 173 }
 174
 175 /*
 176  * Typically this will just store a device pointer.
 177  * In case it was not probed, we will attempt to do so.
 178  * dev may be NULL to unset the active device.
 179  */
 180 static void eth_set_dev(struct udevice *dev)
 181 {
 182         if (dev && !device_active(dev))
 183                 eth_errno = device_probe(dev);
 184         eth_get_uclass_priv()->current = dev;
 185 }
 186
 187 /*
 188  * Find the udevice that either has the name passed in as devname or has an
 189  * alias named devname.
 190  */
 191 struct udevice *eth_get_dev_by_name(const char *devname)
 192 {
 193         int seq = -1;
 194         char *endp = NULL;
 195         const char *startp = NULL;
 196         struct udevice *it;
 197         struct uclass *uc;
 198         int len = strlen("eth");
 199
 200         /* Must be longer than 3 to be an alias */
 201         if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
 202                 startp = devname + len;
 203                 seq = simple_strtoul(startp, &endp, 10);
 204         }
 205
 206         uclass_get(UCLASS_ETH, &uc);
 207         uclass_foreach_dev(it, uc) {
 208                 /*
 209                  * We need the seq to be valid, so try to probe it.
 210                  * If the probe fails, the seq will not match since it will be
 211                  * -1 instead of what we are looking for.
 212                  * We don't care about errors from probe here. Either they won't
 213                  * match an alias or it will match a literal name and we'll pick
 214                  * up the error when we try to probe again in eth_set_dev().
 215                  */
 216                 device_probe(it);
 217                 /*
 218                  * Check for the name or the sequence number to match
 219                  */
 220                 if (strcmp(it->name, devname) == 0 ||
 221                     (endp > startp && it->seq == seq))
 222                         return it;
 223         }
 224
 225         return NULL;
 226 }
 227
 228 unsigned char *eth_get_ethaddr(void)
 229 {
 230         struct eth_pdata *pdata;
 231
 232         if (eth_get_dev()) {
 233                 pdata = eth_get_dev()->platdata;
 234                 return pdata->enetaddr;
 235         }
 236
 237         return NULL;
 238 }
 239
 240 /* Set active state without calling start on the driver */
 241 int eth_init_state_only(void)
 242 {
 243         struct udevice *current;
 244         struct eth_device_priv *priv;
 245
 246         current = eth_get_dev();
 247         if (!current || !device_active(current))
 248                 return -EINVAL;
 249
 250         priv = current->uclass_priv;
 251         priv->state = ETH_STATE_ACTIVE;
 252
 253         return 0;
 254 }
 255
 256 /* Set passive state without calling stop on the driver */
 257 void eth_halt_state_only(void)
 258 {
 259         struct udevice *current;
 260         struct eth_device_priv *priv;
 261
 262         current = eth_get_dev();
 263         if (!current || !device_active(current))
 264                 return;
 265
 266         priv = current->uclass_priv;
 267         priv->state = ETH_STATE_PASSIVE;
 268 }
 269
 270 int eth_get_dev_index(void)
 271 {
 272         if (eth_get_dev())
 273                 return eth_get_dev()->seq;
 274         return -1;
 275 }
 276
 277 static int eth_write_hwaddr(struct udevice *dev)
 278 {
 279         struct eth_pdata *pdata = dev->platdata;
 280         int ret = 0;
 281
 282         if (!dev || !device_active(dev))
 283                 return -EINVAL;
 284
 285         /* seq is valid since the device is active */
 286         if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
 287                 if (!is_valid_ethaddr(pdata->enetaddr)) {
 288                         printf("\nError: %s address %pM illegal value\n",
 289                                dev->name, pdata->enetaddr);
 290                         return -EINVAL;
 291                 }
 292
 293                 /*
 294                  * Drivers are allowed to decide not to implement this at
 295                  * run-time. E.g. Some devices may use it and some may not.
 296                  */
 297                 ret = eth_get_ops(dev)->write_hwaddr(dev);
 298                 if (ret == -ENOSYS)
 299                         ret = 0;
 300                 if (ret)
 301                         printf("\nWarning: %s failed to set MAC address\n",
 302                                dev->name);
 303         }
 304
 305         return ret;
 306 }
 307
 308 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 309         int flags)
 310 {
 311         int index;
 312         int retval;
 313         struct udevice *dev;
 314
 315         /* look for an index after "eth" */
 316         index = simple_strtoul(name + 3, NULL, 10);
 317
 318         retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
 319         if (!retval) {
 320                 struct eth_pdata *pdata = dev->platdata;
 321                 switch (op) {
 322                 case env_op_create:
 323                 case env_op_overwrite:
 324                         eth_parse_enetaddr(value, pdata->enetaddr);
 325                         break;
 326                 case env_op_delete:
 327                         memset(pdata->enetaddr, 0, 6);
 328                 }
 329         }
 330
 331         return 0;
 332 }
 333 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 334
 335 int eth_init(void)
 336 {
 337         struct udevice *current;
 338         struct udevice *old_current;
 339         int ret = -ENODEV;
 340
 341         current = eth_get_dev();
 342         if (!current) {
 343                 printf("No ethernet found.\n");
 344                 return -ENODEV;
 345         }
 346
 347         old_current = current;
 348         do {
 349                 debug("Trying %s\n", current->name);
 350
 351                 if (device_active(current)) {
 352                         ret = eth_get_ops(current)->start(current);
 353                         if (ret >= 0) {
 354                                 struct eth_device_priv *priv =
 355                                         current->uclass_priv;
 356
 357                                 priv->state = ETH_STATE_ACTIVE;
 358                                 return 0;
 359                         }
 360                 } else {
 361                         ret = eth_errno;
 362                 }
 363
 364                 debug("FAIL\n");
 365
 366                 /*
 367                  * If ethrotate is enabled, this will change "current",
 368                  * otherwise we will drop out of this while loop immediately
 369                  */
 370                 eth_try_another(0);
 371                 /* This will ensure the new "current" attempted to probe */
 372                 current = eth_get_dev();
 373         } while (old_current != current);
 374
 375         return ret;
 376 }
 377
 378 void eth_halt(void)
 379 {
 380         struct udevice *current;
 381         struct eth_device_priv *priv;
 382
 383         current = eth_get_dev();
 384         if (!current || !device_active(current))
 385                 return;
 386
 387         eth_get_ops(current)->stop(current);
 388         priv = current->uclass_priv;
 389         priv->state = ETH_STATE_PASSIVE;
 390 }
 391
 392 int eth_send(void *packet, int length)
 393 {
 394         struct udevice *current;
 395         int ret;
 396
 397         current = eth_get_dev();
 398         if (!current)
 399                 return -ENODEV;
 400
 401         if (!device_active(current))
 402                 return -EINVAL;
 403
 404         ret = eth_get_ops(current)->send(current, packet, length);
 405         if (ret < 0) {
 406                 /* We cannot completely return the error at present */
 407                 debug("%s: send() returned error %d\n", __func__, ret);
 408         }
 409         return ret;
 410 }
 411
 412 int eth_rx(void)
 413 {
 414         struct udevice *current;
 415         uchar *packet;
 416         int flags;
 417         int ret;
 418         int i;
 419
 420         current = eth_get_dev();
 421         if (!current)
 422                 return -ENODEV;
 423
 424         if (!device_active(current))
 425                 return -EINVAL;
 426
 427         /* Process up to 32 packets at one time */
 428         flags = ETH_RECV_CHECK_DEVICE;
 429         for (i = 0; i < 32; i++) {
 430                 ret = eth_get_ops(current)->recv(current, flags, &packet);
 431                 flags = 0;
 432                 if (ret > 0)
 433                         net_process_received_packet(packet, ret);
 434                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 435                         eth_get_ops(current)->free_pkt(current, packet, ret);
 436                 if (ret <= 0)
 437                         break;
 438         }
 439         if (ret == -EAGAIN)
 440                 ret = 0;
 441         if (ret < 0) {
 442                 /* We cannot completely return the error at present */
 443                 debug("%s: recv() returned error %d\n", __func__, ret);
 444         }
 445         return ret;
 446 }
 447
 448 int eth_initialize(void)
 449 {
 450         int num_devices = 0;
 451         struct udevice *dev;
 452
 453         eth_common_init();
 454
 455         /*
 456          * Devices need to write the hwaddr even if not started so that Linux
 457          * will have access to the hwaddr that u-boot stored for the device.
 458          * This is accomplished by attempting to probe each device and calling
 459          * their write_hwaddr() operation.
 460          */
 461         uclass_first_device(UCLASS_ETH, &dev);
 462         if (!dev) {
 463                 printf("No ethernet found.\n");
 464                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 465         } else {
 466                 char *ethprime = getenv("ethprime");
 467                 struct udevice *prime_dev = NULL;
 468
 469                 if (ethprime)
 470                         prime_dev = eth_get_dev_by_name(ethprime);
 471                 if (prime_dev) {
 472                         eth_set_dev(prime_dev);
 473                         eth_current_changed();
 474                 } else {
 475                         eth_set_dev(NULL);
 476                 }
 477
 478                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 479                 do {
 480                         if (num_devices)
 481                                 printf(", ");
 482
 483                         printf("eth%d: %s", dev->seq, dev->name);
 484
 485                         if (ethprime && dev == prime_dev)
 486                                 printf(" [PRIME]");
 487
 488                         eth_write_hwaddr(dev);
 489
 490                         uclass_next_device(&dev);
 491                         num_devices++;
 492                 } while (dev);
 493
 494                 putc('\n');
 495         }
 496
 497         return num_devices;
 498 }
 499
 500 static int eth_post_bind(struct udevice *dev)
 501 {
 502         if (strchr(dev->name, ' ')) {
 503                 printf("\nError: eth device name \"%s\" has a space!\n",
 504                        dev->name);
 505                 return -EINVAL;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int eth_pre_unbind(struct udevice *dev)
 512 {
 513         /* Don't hang onto a pointer that is going away */
 514         if (dev == eth_get_uclass_priv()->current)
 515                 eth_set_dev(NULL);
 516
 517         return 0;
 518 }
 519
 520 static int eth_post_probe(struct udevice *dev)
 521 {
 522         struct eth_device_priv *priv = dev->uclass_priv;
 523         struct eth_pdata *pdata = dev->platdata;
 524         unsigned char env_enetaddr[6];
 525
 526         priv->state = ETH_STATE_INIT;
 527
 528         /* Check if the device has a MAC address in ROM */
 529         if (eth_get_ops(dev)->read_rom_hwaddr)
 530                 eth_get_ops(dev)->read_rom_hwaddr(dev);
 531
 532         eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
 533         if (!is_zero_ethaddr(env_enetaddr)) {
 534                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 535                     memcmp(pdata->enetaddr, env_enetaddr, 6)) {
 536                         printf("\nWarning: %s MAC addresses don't match:\n",
 537                                dev->name);
 538                         printf("Address in SROM is         %pM\n",
 539                                pdata->enetaddr);
 540                         printf("Address in environment is  %pM\n",
 541                                env_enetaddr);
 542                 }
 543
 544                 /* Override the ROM MAC address */
 545                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 546         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 547                 eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 548                 printf("\nWarning: %s using MAC address from ROM\n",
 549                        dev->name);
 550         } else if (is_zero_ethaddr(pdata->enetaddr)) {
 551 #ifdef CONFIG_NET_RANDOM_ETHADDR
 552                 net_random_ethaddr(pdata->enetaddr);
 553                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 554                        dev->name, dev->seq, pdata->enetaddr);
 555 #else
 556                 printf("\nError: %s address not set.\n",
 557                        dev->name);
 558                 return -EINVAL;
 559 #endif
 560         }
 561
 562         return 0;
 563 }
 564
 565 static int eth_pre_remove(struct udevice *dev)
 566 {
 567         eth_get_ops(dev)->stop(dev);
 568
 569         return 0;
 570 }
 571
 572 UCLASS_DRIVER(eth) = {
 573         .name           = "eth",
 574         .id             = UCLASS_ETH,
 575         .post_bind      = eth_post_bind,
 576         .pre_unbind     = eth_pre_unbind,
 577         .post_probe     = eth_post_probe,
 578         .pre_remove     = eth_pre_remove,
 579         .priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
 580         .per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 581         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 582 };
 583 #endif
 584
 585 #ifndef CONFIG_DM_ETH
 586
 587 #ifdef CONFIG_API
 588 static struct {
 589         uchar data[PKTSIZE];
 590         int length;
 591 } eth_rcv_bufs[PKTBUFSRX];
 592
 593 static unsigned int eth_rcv_current, eth_rcv_last;
 594 #endif
 595
 596 static struct eth_device *eth_devices;
 597 struct eth_device *eth_current;
 598
 599 static void eth_set_current_to_next(void)
 600 {
 601         eth_current = eth_current->next;
 602 }
 603
 604 static void eth_set_dev(struct eth_device *dev)
 605 {
 606         eth_current = dev;
 607 }
 608
 609 struct eth_device *eth_get_dev_by_name(const char *devname)
 610 {
 611         struct eth_device *dev, *target_dev;
 612
 613         BUG_ON(devname == NULL);
 614
 615         if (!eth_devices)
 616                 return NULL;
 617
 618         dev = eth_devices;
 619         target_dev = NULL;
 620         do {
 621                 if (strcmp(devname, dev->name) == 0) {
 622                         target_dev = dev;
 623                         break;
 624                 }
 625                 dev = dev->next;
 626         } while (dev != eth_devices);
 627
 628         return target_dev;
 629 }
 630
 631 struct eth_device *eth_get_dev_by_index(int index)
 632 {
 633         struct eth_device *dev, *target_dev;
 634
 635         if (!eth_devices)
 636                 return NULL;
 637
 638         dev = eth_devices;
 639         target_dev = NULL;
 640         do {
 641                 if (dev->index == index) {
 642                         target_dev = dev;
 643                         break;
 644                 }
 645                 dev = dev->next;
 646         } while (dev != eth_devices);
 647
 648         return target_dev;
 649 }
 650
 651 int eth_get_dev_index(void)
 652 {
 653         if (!eth_current)
 654                 return -1;
 655
 656         return eth_current->index;
 657 }
 658
 659 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 660         int flags)
 661 {
 662         int index;
 663         struct eth_device *dev;
 664
 665         if (!eth_devices)
 666                 return 0;
 667
 668         /* look for an index after "eth" */
 669         index = simple_strtoul(name + 3, NULL, 10);
 670
 671         dev = eth_devices;
 672         do {
 673                 if (dev->index == index) {
 674                         switch (op) {
 675                         case env_op_create:
 676                         case env_op_overwrite:
 677                                 eth_parse_enetaddr(value, dev->enetaddr);
 678                                 break;
 679                         case env_op_delete:
 680                                 memset(dev->enetaddr, 0, 6);
 681                         }
 682                 }
 683         } while (dev != eth_devices);
 684
 685         return 0;
 686 }
 687 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 688
 689 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 690                    int eth_number)
 691 {
 692         unsigned char env_enetaddr[6];
 693         int ret = 0;
 694
 695         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 696
 697         if (!is_zero_ethaddr(env_enetaddr)) {
 698                 if (!is_zero_ethaddr(dev->enetaddr) &&
 699                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
 700                         printf("\nWarning: %s MAC addresses don't match:\n",
 701                                dev->name);
 702                         printf("Address in SROM is         %pM\n",
 703                                dev->enetaddr);
 704                         printf("Address in environment is  %pM\n",
 705                                env_enetaddr);
 706                 }
 707
 708                 memcpy(dev->enetaddr, env_enetaddr, 6);
 709         } else if (is_valid_ethaddr(dev->enetaddr)) {
 710                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 711                                              dev->enetaddr);
 712                 printf("\nWarning: %s using MAC address from net device\n",
 713                        dev->name);
 714         } else if (is_zero_ethaddr(dev->enetaddr)) {
 715 #ifdef CONFIG_NET_RANDOM_ETHADDR
 716                 net_random_ethaddr(dev->enetaddr);
 717                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 718                        dev->name, eth_number, dev->enetaddr);
 719 #else
 720                 printf("\nError: %s address not set.\n",
 721                        dev->name);
 722                 return -EINVAL;
 723 #endif
 724         }
 725
 726         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 727                 if (!is_valid_ethaddr(dev->enetaddr)) {
 728                         printf("\nError: %s address %pM illegal value\n",
 729                                dev->name, dev->enetaddr);
 730                         return -EINVAL;
 731                 }
 732
 733                 ret = dev->write_hwaddr(dev);
 734                 if (ret)
 735                         printf("\nWarning: %s failed to set MAC address\n",
 736                                dev->name);
 737         }
 738
 739         return ret;
 740 }
 741
 742 int eth_register(struct eth_device *dev)
 743 {
 744         struct eth_device *d;
 745         static int index;
 746
 747         assert(strlen(dev->name) < sizeof(dev->name));
 748
 749         if (!eth_devices) {
 750                 eth_devices = dev;
 751                 eth_current = dev;
 752                 eth_current_changed();
 753         } else {
 754                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 755                         ;
 756                 d->next = dev;
 757         }
 758
 759         dev->state = ETH_STATE_INIT;
 760         dev->next  = eth_devices;
 761         dev->index = index++;
 762
 763         return 0;
 764 }
 765
 766 int eth_unregister(struct eth_device *dev)
 767 {
 768         struct eth_device *cur;
 769
 770         /* No device */
 771         if (!eth_devices)
 772                 return -ENODEV;
 773
 774         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 775              cur = cur->next)
 776                 ;
 777
 778         /* Device not found */
 779         if (cur->next != dev)
 780                 return -ENODEV;
 781
 782         cur->next = dev->next;
 783
 784         if (eth_devices == dev)
 785                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 786
 787         if (eth_current == dev) {
 788                 eth_current = eth_devices;
 789                 eth_current_changed();
 790         }
 791
 792         return 0;
 793 }
 794
 795 int eth_initialize(void)
 796 {
 797         int num_devices = 0;
 798
 799         eth_devices = NULL;
 800         eth_current = NULL;
 801         eth_common_init();
 802
 803         if (!eth_devices) {
 804                 puts("No ethernet found.\n");
 805                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 806         } else {
 807                 struct eth_device *dev = eth_devices;
 808                 char *ethprime = getenv("ethprime");
 809
 810                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 811                 do {
 812                         if (dev->index)
 813                                 puts(", ");
 814
 815                         printf("%s", dev->name);
 816
 817                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 818                                 eth_current = dev;
 819                                 puts(" [PRIME]");
 820                         }
 821
 822                         if (strchr(dev->name, ' '))
 823                                 puts("\nWarning: eth device name has a space!"
 824                                         "\n");
 825
 826                         eth_write_hwaddr(dev, "eth", dev->index);
 827
 828                         dev = dev->next;
 829                         num_devices++;
 830                 } while (dev != eth_devices);
 831
 832                 eth_current_changed();
 833                 putc('\n');
 834         }
 835
 836         return num_devices;
 837 }
 838
 839 #ifdef CONFIG_MCAST_TFTP
 840 /* Multicast.
 841  * mcast_addr: multicast ipaddr from which multicast Mac is made
 842  * join: 1=join, 0=leave.
 843  */
 844 int eth_mcast_join(struct in_addr mcast_ip, int join)
 845 {
 846         u8 mcast_mac[6];
 847         if (!eth_current || !eth_current->mcast)
 848                 return -1;
 849         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 850         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 851         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 852         mcast_mac[2] = 0x5e;
 853         mcast_mac[1] = 0x0;
 854         mcast_mac[0] = 0x1;
 855         return eth_current->mcast(eth_current, mcast_mac, join);
 856 }
 857
 858 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 859  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 860  * some other adapter -- hash tables
 861  */
 862 #define CRCPOLY_LE 0xedb88320
 863 u32 ether_crc(size_t len, unsigned char const *p)
 864 {
 865         int i;
 866         u32 crc;
 867         crc = ~0;
 868         while (len--) {
 869                 crc ^= *p++;
 870                 for (i = 0; i < 8; i++)
 871                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 872         }
 873         /* an reverse the bits, cuz of way they arrive -- last-first */
 874         crc = (crc >> 16) | (crc << 16);
 875         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 876         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 877         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 878         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 879         return crc;
 880 }
 881
 882 #endif
 883
 884
 885 int eth_init(void)
 886 {
 887         struct eth_device *old_current;
 888
 889         if (!eth_current) {
 890                 puts("No ethernet found.\n");
 891                 return -ENODEV;
 892         }
 893
 894         old_current = eth_current;
 895         do {
 896                 debug("Trying %s\n", eth_current->name);
 897
 898                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 899                         eth_current->state = ETH_STATE_ACTIVE;
 900
 901                         return 0;
 902                 }
 903                 debug("FAIL\n");
 904
 905                 eth_try_another(0);
 906         } while (old_current != eth_current);
 907
 908         return -ETIMEDOUT;
 909 }
 910
 911 void eth_halt(void)
 912 {
 913         if (!eth_current)
 914                 return;
 915
 916         eth_current->halt(eth_current);
 917
 918         eth_current->state = ETH_STATE_PASSIVE;
 919 }
 920
 921 int eth_send(void *packet, int length)
 922 {
 923         if (!eth_current)
 924                 return -ENODEV;
 925
 926         return eth_current->send(eth_current, packet, length);
 927 }
 928
 929 int eth_rx(void)
 930 {
 931         if (!eth_current)
 932                 return -ENODEV;
 933
 934         return eth_current->recv(eth_current);
 935 }
 936 #endif /* ifndef CONFIG_DM_ETH */
 937
 938 #ifdef CONFIG_API
 939 static void eth_save_packet(void *packet, int length)
 940 {
 941         char *p = packet;
 942         int i;
 943
 944         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 945                 return;
 946
 947         if (PKTSIZE < length)
 948                 return;
 949
 950         for (i = 0; i < length; i++)
 951                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 952
 953         eth_rcv_bufs[eth_rcv_last].length = length;
 954         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 955 }
 956
 957 int eth_receive(void *packet, int length)
 958 {
 959         char *p = packet;
 960         void *pp = push_packet;
 961         int i;
 962
 963         if (eth_rcv_current == eth_rcv_last) {
 964                 push_packet = eth_save_packet;
 965                 eth_rx();
 966                 push_packet = pp;
 967
 968                 if (eth_rcv_current == eth_rcv_last)
 969                         return -1;
 970         }
 971
 972         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 973
 974         for (i = 0; i < length; i++)
 975                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 976
 977         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 978         return length;
 979 }
 980 #endif /* CONFIG_API */
 981
 982 static void eth_current_changed(void)
 983 {
 984         char *act = getenv("ethact");
 985         /* update current ethernet name */
 986         if (eth_get_dev()) {
 987                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
 988                         setenv("ethact", eth_get_name());
 989         }
 990         /*
 991          * remove the variable completely if there is no active
 992          * interface
 993          */
 994         else if (act != NULL)
 995                 setenv("ethact", NULL);
 996 }
 997
 998 void eth_try_another(int first_restart)
 999 {
1000         static void *first_failed;
1001         char *ethrotate;
1002
1003         /*
1004          * Do not rotate between network interfaces when
1005          * 'ethrotate' variable is set to 'no'.
1006          */
1007         ethrotate = getenv("ethrotate");
1008         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
1009                 return;
1010
1011         if (!eth_get_dev())
1012                 return;
1013
1014         if (first_restart)
1015                 first_failed = eth_get_dev();
1016
1017         eth_set_current_to_next();
1018
1019         eth_current_changed();
1020
1021         if (first_failed == eth_get_dev())
1022                 net_restart_wrap = 1;
1023 }
1024
1025 void eth_set_current(void)
1026 {
1027         static char *act;
1028         static int  env_changed_id;
1029         int     env_id;
1030
1031         env_id = get_env_id();
1032         if ((act == NULL) || (env_changed_id != env_id)) {
1033                 act = getenv("ethact");
1034                 env_changed_id = env_id;
1035         }
1036
1037         if (act == NULL) {
1038                 char *ethprime = getenv("ethprime");
1039                 void *dev = NULL;
1040
1041                 if (ethprime)
1042                         dev = eth_get_dev_by_name(ethprime);
1043                 if (dev)
1044                         eth_set_dev(dev);
1045                 else
1046                         eth_set_dev(NULL);
1047         } else {
1048                 eth_set_dev(eth_get_dev_by_name(act));
1049         }
1050
1051         eth_current_changed();
1052 }
1053
1054 const char *eth_get_name(void)
1055 {
1056         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1057 }