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_is_active(struct udevice *dev)
 393 {
 394         struct eth_device_priv *priv;
 395
 396         if (!dev || !device_active(dev))
 397                 return 0;
 398
 399         priv = dev_get_uclass_priv(dev);
 400         return priv->state == ETH_STATE_ACTIVE;
 401 }
 402
 403 int eth_send(void *packet, int length)
 404 {
 405         struct udevice *current;
 406         int ret;
 407
 408         current = eth_get_dev();
 409         if (!current)
 410                 return -ENODEV;
 411
 412         if (!device_active(current))
 413                 return -EINVAL;
 414
 415         ret = eth_get_ops(current)->send(current, packet, length);
 416         if (ret < 0) {
 417                 /* We cannot completely return the error at present */
 418                 debug("%s: send() returned error %d\n", __func__, ret);
 419         }
 420         return ret;
 421 }
 422
 423 int eth_rx(void)
 424 {
 425         struct udevice *current;
 426         uchar *packet;
 427         int flags;
 428         int ret;
 429         int i;
 430
 431         current = eth_get_dev();
 432         if (!current)
 433                 return -ENODEV;
 434
 435         if (!device_active(current))
 436                 return -EINVAL;
 437
 438         /* Process up to 32 packets at one time */
 439         flags = ETH_RECV_CHECK_DEVICE;
 440         for (i = 0; i < 32; i++) {
 441                 ret = eth_get_ops(current)->recv(current, flags, &packet);
 442                 flags = 0;
 443                 if (ret > 0)
 444                         net_process_received_packet(packet, ret);
 445                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 446                         eth_get_ops(current)->free_pkt(current, packet, ret);
 447                 if (ret <= 0)
 448                         break;
 449         }
 450         if (ret == -EAGAIN)
 451                 ret = 0;
 452         if (ret < 0) {
 453                 /* We cannot completely return the error at present */
 454                 debug("%s: recv() returned error %d\n", __func__, ret);
 455         }
 456         return ret;
 457 }
 458
 459 int eth_initialize(void)
 460 {
 461         int num_devices = 0;
 462         struct udevice *dev;
 463
 464         eth_common_init();
 465
 466         /*
 467          * Devices need to write the hwaddr even if not started so that Linux
 468          * will have access to the hwaddr that u-boot stored for the device.
 469          * This is accomplished by attempting to probe each device and calling
 470          * their write_hwaddr() operation.
 471          */
 472         uclass_first_device(UCLASS_ETH, &dev);
 473         if (!dev) {
 474                 printf("No ethernet found.\n");
 475                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 476         } else {
 477                 char *ethprime = getenv("ethprime");
 478                 struct udevice *prime_dev = NULL;
 479
 480                 if (ethprime)
 481                         prime_dev = eth_get_dev_by_name(ethprime);
 482                 if (prime_dev) {
 483                         eth_set_dev(prime_dev);
 484                         eth_current_changed();
 485                 } else {
 486                         eth_set_dev(NULL);
 487                 }
 488
 489                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 490                 do {
 491                         if (num_devices)
 492                                 printf(", ");
 493
 494                         printf("eth%d: %s", dev->seq, dev->name);
 495
 496                         if (ethprime && dev == prime_dev)
 497                                 printf(" [PRIME]");
 498
 499                         eth_write_hwaddr(dev);
 500
 501                         uclass_next_device(&dev);
 502                         num_devices++;
 503                 } while (dev);
 504
 505                 putc('\n');
 506         }
 507
 508         return num_devices;
 509 }
 510
 511 static int eth_post_bind(struct udevice *dev)
 512 {
 513         if (strchr(dev->name, ' ')) {
 514                 printf("\nError: eth device name \"%s\" has a space!\n",
 515                        dev->name);
 516                 return -EINVAL;
 517         }
 518
 519         return 0;
 520 }
 521
 522 static int eth_pre_unbind(struct udevice *dev)
 523 {
 524         /* Don't hang onto a pointer that is going away */
 525         if (dev == eth_get_uclass_priv()->current)
 526                 eth_set_dev(NULL);
 527
 528         return 0;
 529 }
 530
 531 static int eth_post_probe(struct udevice *dev)
 532 {
 533         struct eth_device_priv *priv = dev->uclass_priv;
 534         struct eth_pdata *pdata = dev->platdata;
 535         unsigned char env_enetaddr[6];
 536
 537         priv->state = ETH_STATE_INIT;
 538
 539         /* Check if the device has a MAC address in ROM */
 540         if (eth_get_ops(dev)->read_rom_hwaddr)
 541                 eth_get_ops(dev)->read_rom_hwaddr(dev);
 542
 543         eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
 544         if (!is_zero_ethaddr(env_enetaddr)) {
 545                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 546                     memcmp(pdata->enetaddr, env_enetaddr, 6)) {
 547                         printf("\nWarning: %s MAC addresses don't match:\n",
 548                                dev->name);
 549                         printf("Address in SROM is         %pM\n",
 550                                pdata->enetaddr);
 551                         printf("Address in environment is  %pM\n",
 552                                env_enetaddr);
 553                 }
 554
 555                 /* Override the ROM MAC address */
 556                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 557         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 558                 eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 559                 printf("\nWarning: %s using MAC address from ROM\n",
 560                        dev->name);
 561         } else if (is_zero_ethaddr(pdata->enetaddr)) {
 562 #ifdef CONFIG_NET_RANDOM_ETHADDR
 563                 net_random_ethaddr(pdata->enetaddr);
 564                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 565                        dev->name, dev->seq, pdata->enetaddr);
 566 #else
 567                 printf("\nError: %s address not set.\n",
 568                        dev->name);
 569                 return -EINVAL;
 570 #endif
 571         }
 572
 573         return 0;
 574 }
 575
 576 static int eth_pre_remove(struct udevice *dev)
 577 {
 578         eth_get_ops(dev)->stop(dev);
 579
 580         return 0;
 581 }
 582
 583 UCLASS_DRIVER(eth) = {
 584         .name           = "eth",
 585         .id             = UCLASS_ETH,
 586         .post_bind      = eth_post_bind,
 587         .pre_unbind     = eth_pre_unbind,
 588         .post_probe     = eth_post_probe,
 589         .pre_remove     = eth_pre_remove,
 590         .priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
 591         .per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 592         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 593 };
 594 #endif /* #ifdef CONFIG_DM_ETH */
 595
 596 #ifndef CONFIG_DM_ETH
 597
 598 #ifdef CONFIG_API
 599 static struct {
 600         uchar data[PKTSIZE];
 601         int length;
 602 } eth_rcv_bufs[PKTBUFSRX];
 603
 604 static unsigned int eth_rcv_current, eth_rcv_last;
 605 #endif
 606
 607 static struct eth_device *eth_devices;
 608 struct eth_device *eth_current;
 609
 610 static void eth_set_current_to_next(void)
 611 {
 612         eth_current = eth_current->next;
 613 }
 614
 615 static void eth_set_dev(struct eth_device *dev)
 616 {
 617         eth_current = dev;
 618 }
 619
 620 struct eth_device *eth_get_dev_by_name(const char *devname)
 621 {
 622         struct eth_device *dev, *target_dev;
 623
 624         BUG_ON(devname == NULL);
 625
 626         if (!eth_devices)
 627                 return NULL;
 628
 629         dev = eth_devices;
 630         target_dev = NULL;
 631         do {
 632                 if (strcmp(devname, dev->name) == 0) {
 633                         target_dev = dev;
 634                         break;
 635                 }
 636                 dev = dev->next;
 637         } while (dev != eth_devices);
 638
 639         return target_dev;
 640 }
 641
 642 struct eth_device *eth_get_dev_by_index(int index)
 643 {
 644         struct eth_device *dev, *target_dev;
 645
 646         if (!eth_devices)
 647                 return NULL;
 648
 649         dev = eth_devices;
 650         target_dev = NULL;
 651         do {
 652                 if (dev->index == index) {
 653                         target_dev = dev;
 654                         break;
 655                 }
 656                 dev = dev->next;
 657         } while (dev != eth_devices);
 658
 659         return target_dev;
 660 }
 661
 662 int eth_get_dev_index(void)
 663 {
 664         if (!eth_current)
 665                 return -1;
 666
 667         return eth_current->index;
 668 }
 669
 670 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 671         int flags)
 672 {
 673         int index;
 674         struct eth_device *dev;
 675
 676         if (!eth_devices)
 677                 return 0;
 678
 679         /* look for an index after "eth" */
 680         index = simple_strtoul(name + 3, NULL, 10);
 681
 682         dev = eth_devices;
 683         do {
 684                 if (dev->index == index) {
 685                         switch (op) {
 686                         case env_op_create:
 687                         case env_op_overwrite:
 688                                 eth_parse_enetaddr(value, dev->enetaddr);
 689                                 break;
 690                         case env_op_delete:
 691                                 memset(dev->enetaddr, 0, 6);
 692                         }
 693                 }
 694         } while (dev != eth_devices);
 695
 696         return 0;
 697 }
 698 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 699
 700 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 701                    int eth_number)
 702 {
 703         unsigned char env_enetaddr[6];
 704         int ret = 0;
 705
 706         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 707
 708         if (!is_zero_ethaddr(env_enetaddr)) {
 709                 if (!is_zero_ethaddr(dev->enetaddr) &&
 710                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
 711                         printf("\nWarning: %s MAC addresses don't match:\n",
 712                                dev->name);
 713                         printf("Address in SROM is         %pM\n",
 714                                dev->enetaddr);
 715                         printf("Address in environment is  %pM\n",
 716                                env_enetaddr);
 717                 }
 718
 719                 memcpy(dev->enetaddr, env_enetaddr, 6);
 720         } else if (is_valid_ethaddr(dev->enetaddr)) {
 721                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 722                                              dev->enetaddr);
 723                 printf("\nWarning: %s using MAC address from net device\n",
 724                        dev->name);
 725         } else if (is_zero_ethaddr(dev->enetaddr)) {
 726 #ifdef CONFIG_NET_RANDOM_ETHADDR
 727                 net_random_ethaddr(dev->enetaddr);
 728                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 729                        dev->name, eth_number, dev->enetaddr);
 730 #else
 731                 printf("\nError: %s address not set.\n",
 732                        dev->name);
 733                 return -EINVAL;
 734 #endif
 735         }
 736
 737         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 738                 if (!is_valid_ethaddr(dev->enetaddr)) {
 739                         printf("\nError: %s address %pM illegal value\n",
 740                                dev->name, dev->enetaddr);
 741                         return -EINVAL;
 742                 }
 743
 744                 ret = dev->write_hwaddr(dev);
 745                 if (ret)
 746                         printf("\nWarning: %s failed to set MAC address\n",
 747                                dev->name);
 748         }
 749
 750         return ret;
 751 }
 752
 753 int eth_register(struct eth_device *dev)
 754 {
 755         struct eth_device *d;
 756         static int index;
 757
 758         assert(strlen(dev->name) < sizeof(dev->name));
 759
 760         if (!eth_devices) {
 761                 eth_devices = dev;
 762                 eth_current = dev;
 763                 eth_current_changed();
 764         } else {
 765                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 766                         ;
 767                 d->next = dev;
 768         }
 769
 770         dev->state = ETH_STATE_INIT;
 771         dev->next  = eth_devices;
 772         dev->index = index++;
 773
 774         return 0;
 775 }
 776
 777 int eth_unregister(struct eth_device *dev)
 778 {
 779         struct eth_device *cur;
 780
 781         /* No device */
 782         if (!eth_devices)
 783                 return -ENODEV;
 784
 785         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 786              cur = cur->next)
 787                 ;
 788
 789         /* Device not found */
 790         if (cur->next != dev)
 791                 return -ENODEV;
 792
 793         cur->next = dev->next;
 794
 795         if (eth_devices == dev)
 796                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 797
 798         if (eth_current == dev) {
 799                 eth_current = eth_devices;
 800                 eth_current_changed();
 801         }
 802
 803         return 0;
 804 }
 805
 806 int eth_initialize(void)
 807 {
 808         int num_devices = 0;
 809
 810         eth_devices = NULL;
 811         eth_current = NULL;
 812         eth_common_init();
 813
 814         if (!eth_devices) {
 815                 puts("No ethernet found.\n");
 816                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 817         } else {
 818                 struct eth_device *dev = eth_devices;
 819                 char *ethprime = getenv("ethprime");
 820
 821                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 822                 do {
 823                         if (dev->index)
 824                                 puts(", ");
 825
 826                         printf("%s", dev->name);
 827
 828                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 829                                 eth_current = dev;
 830                                 puts(" [PRIME]");
 831                         }
 832
 833                         if (strchr(dev->name, ' '))
 834                                 puts("\nWarning: eth device name has a space!"
 835                                         "\n");
 836
 837                         eth_write_hwaddr(dev, "eth", dev->index);
 838
 839                         dev = dev->next;
 840                         num_devices++;
 841                 } while (dev != eth_devices);
 842
 843                 eth_current_changed();
 844                 putc('\n');
 845         }
 846
 847         return num_devices;
 848 }
 849
 850 #ifdef CONFIG_MCAST_TFTP
 851 /* Multicast.
 852  * mcast_addr: multicast ipaddr from which multicast Mac is made
 853  * join: 1=join, 0=leave.
 854  */
 855 int eth_mcast_join(struct in_addr mcast_ip, int join)
 856 {
 857         u8 mcast_mac[6];
 858         if (!eth_current || !eth_current->mcast)
 859                 return -1;
 860         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 861         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 862         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 863         mcast_mac[2] = 0x5e;
 864         mcast_mac[1] = 0x0;
 865         mcast_mac[0] = 0x1;
 866         return eth_current->mcast(eth_current, mcast_mac, join);
 867 }
 868
 869 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 870  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 871  * some other adapter -- hash tables
 872  */
 873 #define CRCPOLY_LE 0xedb88320
 874 u32 ether_crc(size_t len, unsigned char const *p)
 875 {
 876         int i;
 877         u32 crc;
 878         crc = ~0;
 879         while (len--) {
 880                 crc ^= *p++;
 881                 for (i = 0; i < 8; i++)
 882                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 883         }
 884         /* an reverse the bits, cuz of way they arrive -- last-first */
 885         crc = (crc >> 16) | (crc << 16);
 886         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 887         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 888         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 889         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 890         return crc;
 891 }
 892
 893 #endif
 894
 895
 896 int eth_init(void)
 897 {
 898         struct eth_device *old_current;
 899
 900         if (!eth_current) {
 901                 puts("No ethernet found.\n");
 902                 return -ENODEV;
 903         }
 904
 905         old_current = eth_current;
 906         do {
 907                 debug("Trying %s\n", eth_current->name);
 908
 909                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 910                         eth_current->state = ETH_STATE_ACTIVE;
 911
 912                         return 0;
 913                 }
 914                 debug("FAIL\n");
 915
 916                 eth_try_another(0);
 917         } while (old_current != eth_current);
 918
 919         return -ETIMEDOUT;
 920 }
 921
 922 void eth_halt(void)
 923 {
 924         if (!eth_current)
 925                 return;
 926
 927         eth_current->halt(eth_current);
 928
 929         eth_current->state = ETH_STATE_PASSIVE;
 930 }
 931
 932 int eth_is_active(struct eth_device *dev)
 933 {
 934         return dev && dev->state == ETH_STATE_ACTIVE;
 935 }
 936
 937 int eth_send(void *packet, int length)
 938 {
 939         if (!eth_current)
 940                 return -ENODEV;
 941
 942         return eth_current->send(eth_current, packet, length);
 943 }
 944
 945 int eth_rx(void)
 946 {
 947         if (!eth_current)
 948                 return -ENODEV;
 949
 950         return eth_current->recv(eth_current);
 951 }
 952 #endif /* ifndef CONFIG_DM_ETH */
 953
 954 #ifdef CONFIG_API
 955 static void eth_save_packet(void *packet, int length)
 956 {
 957         char *p = packet;
 958         int i;
 959
 960         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 961                 return;
 962
 963         if (PKTSIZE < length)
 964                 return;
 965
 966         for (i = 0; i < length; i++)
 967                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 968
 969         eth_rcv_bufs[eth_rcv_last].length = length;
 970         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 971 }
 972
 973 int eth_receive(void *packet, int length)
 974 {
 975         char *p = packet;
 976         void *pp = push_packet;
 977         int i;
 978
 979         if (eth_rcv_current == eth_rcv_last) {
 980                 push_packet = eth_save_packet;
 981                 eth_rx();
 982                 push_packet = pp;
 983
 984                 if (eth_rcv_current == eth_rcv_last)
 985                         return -1;
 986         }
 987
 988         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 989
 990         for (i = 0; i < length; i++)
 991                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 992
 993         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 994         return length;
 995 }
 996 #endif /* CONFIG_API */
 997
 998 static void eth_current_changed(void)
 999 {
1000         char *act = getenv("ethact");
1001         /* update current ethernet name */
1002         if (eth_get_dev()) {
1003                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
1004                         setenv("ethact", eth_get_name());
1005         }
1006         /*
1007          * remove the variable completely if there is no active
1008          * interface
1009          */
1010         else if (act != NULL)
1011                 setenv("ethact", NULL);
1012 }
1013
1014 void eth_try_another(int first_restart)
1015 {
1016         static void *first_failed;
1017         char *ethrotate;
1018
1019         /*
1020          * Do not rotate between network interfaces when
1021          * 'ethrotate' variable is set to 'no'.
1022          */
1023         ethrotate = getenv("ethrotate");
1024         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
1025                 return;
1026
1027         if (!eth_get_dev())
1028                 return;
1029
1030         if (first_restart)
1031                 first_failed = eth_get_dev();
1032
1033         eth_set_current_to_next();
1034
1035         eth_current_changed();
1036
1037         if (first_failed == eth_get_dev())
1038                 net_restart_wrap = 1;
1039 }
1040
1041 void eth_set_current(void)
1042 {
1043         static char *act;
1044         static int  env_changed_id;
1045         int     env_id;
1046
1047         env_id = get_env_id();
1048         if ((act == NULL) || (env_changed_id != env_id)) {
1049                 act = getenv("ethact");
1050                 env_changed_id = env_id;
1051         }
1052
1053         if (act == NULL) {
1054                 char *ethprime = getenv("ethprime");
1055                 void *dev = NULL;
1056
1057                 if (ethprime)
1058                         dev = eth_get_dev_by_name(ethprime);
1059                 if (dev)
1060                         eth_set_dev(dev);
1061                 else
1062                         eth_set_dev(NULL);
1063         } else {
1064                 eth_set_dev(eth_get_dev_by_name(act));
1065         }
1066
1067         eth_current_changed();
1068 }
1069
1070 const char *eth_get_name(void)
1071 {
1072         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1073 }