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(const 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(const 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                 if (eth_errno)
 185                         dev = NULL;
 186         }
 187
 188         eth_get_uclass_priv()->current = dev;
 189 }
 190
 191 /*
 192  * Find the udevice that either has the name passed in as devname or has an
 193  * alias named devname.
 194  */
 195 struct udevice *eth_get_dev_by_name(const char *devname)
 196 {
 197         int seq = -1;
 198         char *endp = NULL;
 199         const char *startp = NULL;
 200         struct udevice *it;
 201         struct uclass *uc;
 202         int len = strlen("eth");
 203
 204         /* Must be longer than 3 to be an alias */
 205         if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
 206                 startp = devname + len;
 207                 seq = simple_strtoul(startp, &endp, 10);
 208         }
 209
 210         uclass_get(UCLASS_ETH, &uc);
 211         uclass_foreach_dev(it, uc) {
 212                 /*
 213                  * We need the seq to be valid, so try to probe it.
 214                  * If the probe fails, the seq will not match since it will be
 215                  * -1 instead of what we are looking for.
 216                  * We don't care about errors from probe here. Either they won't
 217                  * match an alias or it will match a literal name and we'll pick
 218                  * up the error when we try to probe again in eth_set_dev().
 219                  */
 220                 if (device_probe(it))
 221                         continue;
 222                 /* Check for the name or the sequence number to match */
 223                 if (strcmp(it->name, devname) == 0 ||
 224                     (endp > startp && it->seq == seq))
 225                         return it;
 226         }
 227
 228         return NULL;
 229 }
 230
 231 unsigned char *eth_get_ethaddr(void)
 232 {
 233         struct eth_pdata *pdata;
 234
 235         if (eth_get_dev()) {
 236                 pdata = eth_get_dev()->platdata;
 237                 return pdata->enetaddr;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 /* Set active state without calling start on the driver */
 244 int eth_init_state_only(void)
 245 {
 246         struct udevice *current;
 247         struct eth_device_priv *priv;
 248
 249         current = eth_get_dev();
 250         if (!current || !device_active(current))
 251                 return -EINVAL;
 252
 253         priv = current->uclass_priv;
 254         priv->state = ETH_STATE_ACTIVE;
 255
 256         return 0;
 257 }
 258
 259 /* Set passive state without calling stop on the driver */
 260 void eth_halt_state_only(void)
 261 {
 262         struct udevice *current;
 263         struct eth_device_priv *priv;
 264
 265         current = eth_get_dev();
 266         if (!current || !device_active(current))
 267                 return;
 268
 269         priv = current->uclass_priv;
 270         priv->state = ETH_STATE_PASSIVE;
 271 }
 272
 273 int eth_get_dev_index(void)
 274 {
 275         if (eth_get_dev())
 276                 return eth_get_dev()->seq;
 277         return -1;
 278 }
 279
 280 static int eth_write_hwaddr(struct udevice *dev)
 281 {
 282         struct eth_pdata *pdata = dev->platdata;
 283         int ret = 0;
 284
 285         if (!dev || !device_active(dev))
 286                 return -EINVAL;
 287
 288         /* seq is valid since the device is active */
 289         if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
 290                 if (!is_valid_ethaddr(pdata->enetaddr)) {
 291                         printf("\nError: %s address %pM illegal value\n",
 292                                dev->name, pdata->enetaddr);
 293                         return -EINVAL;
 294                 }
 295
 296                 /*
 297                  * Drivers are allowed to decide not to implement this at
 298                  * run-time. E.g. Some devices may use it and some may not.
 299                  */
 300                 ret = eth_get_ops(dev)->write_hwaddr(dev);
 301                 if (ret == -ENOSYS)
 302                         ret = 0;
 303                 if (ret)
 304                         printf("\nWarning: %s failed to set MAC address\n",
 305                                dev->name);
 306         }
 307
 308         return ret;
 309 }
 310
 311 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 312         int flags)
 313 {
 314         int index;
 315         int retval;
 316         struct udevice *dev;
 317
 318         /* look for an index after "eth" */
 319         index = simple_strtoul(name + 3, NULL, 10);
 320
 321         retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
 322         if (!retval) {
 323                 struct eth_pdata *pdata = dev->platdata;
 324                 switch (op) {
 325                 case env_op_create:
 326                 case env_op_overwrite:
 327                         eth_parse_enetaddr(value, pdata->enetaddr);
 328                         break;
 329                 case env_op_delete:
 330                         memset(pdata->enetaddr, 0, 6);
 331                 }
 332         }
 333
 334         return 0;
 335 }
 336 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 337
 338 int eth_init(void)
 339 {
 340         struct udevice *current;
 341         struct udevice *old_current;
 342         int ret = -ENODEV;
 343
 344         current = eth_get_dev();
 345         if (!current) {
 346                 printf("No ethernet found.\n");
 347                 return -ENODEV;
 348         }
 349
 350         old_current = current;
 351         do {
 352                 if (current) {
 353                         debug("Trying %s\n", current->name);
 354
 355                         if (device_active(current)) {
 356                                 ret = eth_get_ops(current)->start(current);
 357                                 if (ret >= 0) {
 358                                         struct eth_device_priv *priv =
 359                                                 current->uclass_priv;
 360
 361                                         priv->state = ETH_STATE_ACTIVE;
 362                                         return 0;
 363                                 }
 364                         } else {
 365                                 ret = eth_errno;
 366                         }
 367
 368                         debug("FAIL\n");
 369                 } else {
 370                         debug("PROBE FAIL\n");
 371                 }
 372
 373                 /*
 374                  * If ethrotate is enabled, this will change "current",
 375                  * otherwise we will drop out of this while loop immediately
 376                  */
 377                 eth_try_another(0);
 378                 /* This will ensure the new "current" attempted to probe */
 379                 current = eth_get_dev();
 380         } while (old_current != current);
 381
 382         return ret;
 383 }
 384
 385 void eth_halt(void)
 386 {
 387         struct udevice *current;
 388         struct eth_device_priv *priv;
 389
 390         current = eth_get_dev();
 391         if (!current || !device_active(current))
 392                 return;
 393
 394         eth_get_ops(current)->stop(current);
 395         priv = current->uclass_priv;
 396         priv->state = ETH_STATE_PASSIVE;
 397 }
 398
 399 int eth_is_active(struct udevice *dev)
 400 {
 401         struct eth_device_priv *priv;
 402
 403         if (!dev || !device_active(dev))
 404                 return 0;
 405
 406         priv = dev_get_uclass_priv(dev);
 407         return priv->state == ETH_STATE_ACTIVE;
 408 }
 409
 410 int eth_send(void *packet, int length)
 411 {
 412         struct udevice *current;
 413         int ret;
 414
 415         current = eth_get_dev();
 416         if (!current)
 417                 return -ENODEV;
 418
 419         if (!device_active(current))
 420                 return -EINVAL;
 421
 422         ret = eth_get_ops(current)->send(current, packet, length);
 423         if (ret < 0) {
 424                 /* We cannot completely return the error at present */
 425                 debug("%s: send() returned error %d\n", __func__, ret);
 426         }
 427         return ret;
 428 }
 429
 430 int eth_rx(void)
 431 {
 432         struct udevice *current;
 433         uchar *packet;
 434         int flags;
 435         int ret;
 436         int i;
 437
 438         current = eth_get_dev();
 439         if (!current)
 440                 return -ENODEV;
 441
 442         if (!device_active(current))
 443                 return -EINVAL;
 444
 445         /* Process up to 32 packets at one time */
 446         flags = ETH_RECV_CHECK_DEVICE;
 447         for (i = 0; i < 32; i++) {
 448                 ret = eth_get_ops(current)->recv(current, flags, &packet);
 449                 flags = 0;
 450                 if (ret > 0)
 451                         net_process_received_packet(packet, ret);
 452                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 453                         eth_get_ops(current)->free_pkt(current, packet, ret);
 454                 if (ret <= 0)
 455                         break;
 456         }
 457         if (ret == -EAGAIN)
 458                 ret = 0;
 459         if (ret < 0) {
 460                 /* We cannot completely return the error at present */
 461                 debug("%s: recv() returned error %d\n", __func__, ret);
 462         }
 463         return ret;
 464 }
 465
 466 int eth_initialize(void)
 467 {
 468         int num_devices = 0;
 469         struct udevice *dev;
 470
 471         eth_common_init();
 472
 473         /*
 474          * Devices need to write the hwaddr even if not started so that Linux
 475          * will have access to the hwaddr that u-boot stored for the device.
 476          * This is accomplished by attempting to probe each device and calling
 477          * their write_hwaddr() operation.
 478          */
 479         uclass_first_device(UCLASS_ETH, &dev);
 480         if (!dev) {
 481                 printf("No ethernet found.\n");
 482                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 483         } else {
 484                 char *ethprime = getenv("ethprime");
 485                 struct udevice *prime_dev = NULL;
 486
 487                 if (ethprime)
 488                         prime_dev = eth_get_dev_by_name(ethprime);
 489                 if (prime_dev) {
 490                         eth_set_dev(prime_dev);
 491                         eth_current_changed();
 492                 } else {
 493                         eth_set_dev(NULL);
 494                 }
 495
 496                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 497                 do {
 498                         if (num_devices)
 499                                 printf(", ");
 500
 501                         printf("eth%d: %s", dev->seq, dev->name);
 502
 503                         if (ethprime && dev == prime_dev)
 504                                 printf(" [PRIME]");
 505
 506                         eth_write_hwaddr(dev);
 507
 508                         uclass_next_device(&dev);
 509                         num_devices++;
 510                 } while (dev);
 511
 512                 putc('\n');
 513         }
 514
 515         return num_devices;
 516 }
 517
 518 static int eth_post_bind(struct udevice *dev)
 519 {
 520         if (strchr(dev->name, ' ')) {
 521                 printf("\nError: eth device name \"%s\" has a space!\n",
 522                        dev->name);
 523                 return -EINVAL;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int eth_pre_unbind(struct udevice *dev)
 530 {
 531         /* Don't hang onto a pointer that is going away */
 532         if (dev == eth_get_uclass_priv()->current)
 533                 eth_set_dev(NULL);
 534
 535         return 0;
 536 }
 537
 538 static int eth_post_probe(struct udevice *dev)
 539 {
 540         struct eth_device_priv *priv = dev->uclass_priv;
 541         struct eth_pdata *pdata = dev->platdata;
 542         unsigned char env_enetaddr[6];
 543
 544         priv->state = ETH_STATE_INIT;
 545
 546         /* Check if the device has a MAC address in ROM */
 547         if (eth_get_ops(dev)->read_rom_hwaddr)
 548                 eth_get_ops(dev)->read_rom_hwaddr(dev);
 549
 550         eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
 551         if (!is_zero_ethaddr(env_enetaddr)) {
 552                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 553                     memcmp(pdata->enetaddr, env_enetaddr, 6)) {
 554                         printf("\nWarning: %s MAC addresses don't match:\n",
 555                                dev->name);
 556                         printf("Address in SROM is         %pM\n",
 557                                pdata->enetaddr);
 558                         printf("Address in environment is  %pM\n",
 559                                env_enetaddr);
 560                 }
 561
 562                 /* Override the ROM MAC address */
 563                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 564         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 565                 eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 566                 printf("\nWarning: %s using MAC address from ROM\n",
 567                        dev->name);
 568         } else if (is_zero_ethaddr(pdata->enetaddr)) {
 569 #ifdef CONFIG_NET_RANDOM_ETHADDR
 570                 net_random_ethaddr(pdata->enetaddr);
 571                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 572                        dev->name, dev->seq, pdata->enetaddr);
 573 #else
 574                 printf("\nError: %s address not set.\n",
 575                        dev->name);
 576                 return -EINVAL;
 577 #endif
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int eth_pre_remove(struct udevice *dev)
 584 {
 585         struct eth_pdata *pdata = dev->platdata;
 586
 587         eth_get_ops(dev)->stop(dev);
 588
 589         /* clear the MAC address */
 590         memset(pdata->enetaddr, 0, 6);
 591
 592         return 0;
 593 }
 594
 595 UCLASS_DRIVER(eth) = {
 596         .name           = "eth",
 597         .id             = UCLASS_ETH,
 598         .post_bind      = eth_post_bind,
 599         .pre_unbind     = eth_pre_unbind,
 600         .post_probe     = eth_post_probe,
 601         .pre_remove     = eth_pre_remove,
 602         .priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
 603         .per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 604         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 605 };
 606 #endif /* #ifdef CONFIG_DM_ETH */
 607
 608 #ifndef CONFIG_DM_ETH
 609
 610 #ifdef CONFIG_API
 611 static struct {
 612         uchar data[PKTSIZE];
 613         int length;
 614 } eth_rcv_bufs[PKTBUFSRX];
 615
 616 static unsigned int eth_rcv_current, eth_rcv_last;
 617 #endif
 618
 619 static struct eth_device *eth_devices;
 620 struct eth_device *eth_current;
 621
 622 static void eth_set_current_to_next(void)
 623 {
 624         eth_current = eth_current->next;
 625 }
 626
 627 static void eth_set_dev(struct eth_device *dev)
 628 {
 629         eth_current = dev;
 630 }
 631
 632 struct eth_device *eth_get_dev_by_name(const char *devname)
 633 {
 634         struct eth_device *dev, *target_dev;
 635
 636         BUG_ON(devname == NULL);
 637
 638         if (!eth_devices)
 639                 return NULL;
 640
 641         dev = eth_devices;
 642         target_dev = NULL;
 643         do {
 644                 if (strcmp(devname, dev->name) == 0) {
 645                         target_dev = dev;
 646                         break;
 647                 }
 648                 dev = dev->next;
 649         } while (dev != eth_devices);
 650
 651         return target_dev;
 652 }
 653
 654 struct eth_device *eth_get_dev_by_index(int index)
 655 {
 656         struct eth_device *dev, *target_dev;
 657
 658         if (!eth_devices)
 659                 return NULL;
 660
 661         dev = eth_devices;
 662         target_dev = NULL;
 663         do {
 664                 if (dev->index == index) {
 665                         target_dev = dev;
 666                         break;
 667                 }
 668                 dev = dev->next;
 669         } while (dev != eth_devices);
 670
 671         return target_dev;
 672 }
 673
 674 int eth_get_dev_index(void)
 675 {
 676         if (!eth_current)
 677                 return -1;
 678
 679         return eth_current->index;
 680 }
 681
 682 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 683         int flags)
 684 {
 685         int index;
 686         struct eth_device *dev;
 687
 688         if (!eth_devices)
 689                 return 0;
 690
 691         /* look for an index after "eth" */
 692         index = simple_strtoul(name + 3, NULL, 10);
 693
 694         dev = eth_devices;
 695         do {
 696                 if (dev->index == index) {
 697                         switch (op) {
 698                         case env_op_create:
 699                         case env_op_overwrite:
 700                                 eth_parse_enetaddr(value, dev->enetaddr);
 701                                 break;
 702                         case env_op_delete:
 703                                 memset(dev->enetaddr, 0, 6);
 704                         }
 705                 }
 706                 dev = dev->next;
 707         } while (dev != eth_devices);
 708
 709         return 0;
 710 }
 711 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 712
 713 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 714                    int eth_number)
 715 {
 716         unsigned char env_enetaddr[6];
 717         int ret = 0;
 718
 719         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 720
 721         if (!is_zero_ethaddr(env_enetaddr)) {
 722                 if (!is_zero_ethaddr(dev->enetaddr) &&
 723                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
 724                         printf("\nWarning: %s MAC addresses don't match:\n",
 725                                dev->name);
 726                         printf("Address in SROM is         %pM\n",
 727                                dev->enetaddr);
 728                         printf("Address in environment is  %pM\n",
 729                                env_enetaddr);
 730                 }
 731
 732                 memcpy(dev->enetaddr, env_enetaddr, 6);
 733         } else if (is_valid_ethaddr(dev->enetaddr)) {
 734                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 735                                              dev->enetaddr);
 736                 printf("\nWarning: %s using MAC address from net device\n",
 737                        dev->name);
 738         } else if (is_zero_ethaddr(dev->enetaddr)) {
 739 #ifdef CONFIG_NET_RANDOM_ETHADDR
 740                 net_random_ethaddr(dev->enetaddr);
 741                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 742                        dev->name, eth_number, dev->enetaddr);
 743 #else
 744                 printf("\nError: %s address not set.\n",
 745                        dev->name);
 746                 return -EINVAL;
 747 #endif
 748         }
 749
 750         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 751                 if (!is_valid_ethaddr(dev->enetaddr)) {
 752                         printf("\nError: %s address %pM illegal value\n",
 753                                dev->name, dev->enetaddr);
 754                         return -EINVAL;
 755                 }
 756
 757                 ret = dev->write_hwaddr(dev);
 758                 if (ret)
 759                         printf("\nWarning: %s failed to set MAC address\n",
 760                                dev->name);
 761         }
 762
 763         return ret;
 764 }
 765
 766 int eth_register(struct eth_device *dev)
 767 {
 768         struct eth_device *d;
 769         static int index;
 770
 771         assert(strlen(dev->name) < sizeof(dev->name));
 772
 773         if (!eth_devices) {
 774                 eth_devices = dev;
 775                 eth_current = dev;
 776                 eth_current_changed();
 777         } else {
 778                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 779                         ;
 780                 d->next = dev;
 781         }
 782
 783         dev->state = ETH_STATE_INIT;
 784         dev->next  = eth_devices;
 785         dev->index = index++;
 786
 787         return 0;
 788 }
 789
 790 int eth_unregister(struct eth_device *dev)
 791 {
 792         struct eth_device *cur;
 793
 794         /* No device */
 795         if (!eth_devices)
 796                 return -ENODEV;
 797
 798         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 799              cur = cur->next)
 800                 ;
 801
 802         /* Device not found */
 803         if (cur->next != dev)
 804                 return -ENODEV;
 805
 806         cur->next = dev->next;
 807
 808         if (eth_devices == dev)
 809                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 810
 811         if (eth_current == dev) {
 812                 eth_current = eth_devices;
 813                 eth_current_changed();
 814         }
 815
 816         return 0;
 817 }
 818
 819 int eth_initialize(void)
 820 {
 821         int num_devices = 0;
 822
 823         eth_devices = NULL;
 824         eth_current = NULL;
 825         eth_common_init();
 826
 827         if (!eth_devices) {
 828                 puts("No ethernet found.\n");
 829                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 830         } else {
 831                 struct eth_device *dev = eth_devices;
 832                 char *ethprime = getenv("ethprime");
 833
 834                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 835                 do {
 836                         if (dev->index)
 837                                 puts(", ");
 838
 839                         printf("%s", dev->name);
 840
 841                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 842                                 eth_current = dev;
 843                                 puts(" [PRIME]");
 844                         }
 845
 846                         if (strchr(dev->name, ' '))
 847                                 puts("\nWarning: eth device name has a space!"
 848                                         "\n");
 849
 850                         eth_write_hwaddr(dev, "eth", dev->index);
 851
 852                         dev = dev->next;
 853                         num_devices++;
 854                 } while (dev != eth_devices);
 855
 856                 eth_current_changed();
 857                 putc('\n');
 858         }
 859
 860         return num_devices;
 861 }
 862
 863 #ifdef CONFIG_MCAST_TFTP
 864 /* Multicast.
 865  * mcast_addr: multicast ipaddr from which multicast Mac is made
 866  * join: 1=join, 0=leave.
 867  */
 868 int eth_mcast_join(struct in_addr mcast_ip, int join)
 869 {
 870         u8 mcast_mac[6];
 871         if (!eth_current || !eth_current->mcast)
 872                 return -1;
 873         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 874         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 875         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 876         mcast_mac[2] = 0x5e;
 877         mcast_mac[1] = 0x0;
 878         mcast_mac[0] = 0x1;
 879         return eth_current->mcast(eth_current, mcast_mac, join);
 880 }
 881
 882 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 883  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 884  * some other adapter -- hash tables
 885  */
 886 #define CRCPOLY_LE 0xedb88320
 887 u32 ether_crc(size_t len, unsigned char const *p)
 888 {
 889         int i;
 890         u32 crc;
 891         crc = ~0;
 892         while (len--) {
 893                 crc ^= *p++;
 894                 for (i = 0; i < 8; i++)
 895                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 896         }
 897         /* an reverse the bits, cuz of way they arrive -- last-first */
 898         crc = (crc >> 16) | (crc << 16);
 899         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 900         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 901         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 902         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 903         return crc;
 904 }
 905
 906 #endif
 907
 908
 909 int eth_init(void)
 910 {
 911         struct eth_device *old_current;
 912
 913         if (!eth_current) {
 914                 puts("No ethernet found.\n");
 915                 return -ENODEV;
 916         }
 917
 918         old_current = eth_current;
 919         do {
 920                 debug("Trying %s\n", eth_current->name);
 921
 922                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 923                         eth_current->state = ETH_STATE_ACTIVE;
 924
 925                         return 0;
 926                 }
 927                 debug("FAIL\n");
 928
 929                 eth_try_another(0);
 930         } while (old_current != eth_current);
 931
 932         return -ETIMEDOUT;
 933 }
 934
 935 void eth_halt(void)
 936 {
 937         if (!eth_current)
 938                 return;
 939
 940         eth_current->halt(eth_current);
 941
 942         eth_current->state = ETH_STATE_PASSIVE;
 943 }
 944
 945 int eth_is_active(struct eth_device *dev)
 946 {
 947         return dev && dev->state == ETH_STATE_ACTIVE;
 948 }
 949
 950 int eth_send(void *packet, int length)
 951 {
 952         if (!eth_current)
 953                 return -ENODEV;
 954
 955         return eth_current->send(eth_current, packet, length);
 956 }
 957
 958 int eth_rx(void)
 959 {
 960         if (!eth_current)
 961                 return -ENODEV;
 962
 963         return eth_current->recv(eth_current);
 964 }
 965 #endif /* ifndef CONFIG_DM_ETH */
 966
 967 #ifdef CONFIG_API
 968 static void eth_save_packet(void *packet, int length)
 969 {
 970         char *p = packet;
 971         int i;
 972
 973         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 974                 return;
 975
 976         if (PKTSIZE < length)
 977                 return;
 978
 979         for (i = 0; i < length; i++)
 980                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 981
 982         eth_rcv_bufs[eth_rcv_last].length = length;
 983         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 984 }
 985
 986 int eth_receive(void *packet, int length)
 987 {
 988         char *p = packet;
 989         void *pp = push_packet;
 990         int i;
 991
 992         if (eth_rcv_current == eth_rcv_last) {
 993                 push_packet = eth_save_packet;
 994                 eth_rx();
 995                 push_packet = pp;
 996
 997                 if (eth_rcv_current == eth_rcv_last)
 998                         return -1;
 999         }
1000
1001         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
1002
1003         for (i = 0; i < length; i++)
1004                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
1005
1006         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
1007         return length;
1008 }
1009 #endif /* CONFIG_API */
1010
1011 static void eth_current_changed(void)
1012 {
1013         char *act = getenv("ethact");
1014         /* update current ethernet name */
1015         if (eth_get_dev()) {
1016                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
1017                         setenv("ethact", eth_get_name());
1018         }
1019         /*
1020          * remove the variable completely if there is no active
1021          * interface
1022          */
1023         else if (act != NULL)
1024                 setenv("ethact", NULL);
1025 }
1026
1027 void eth_try_another(int first_restart)
1028 {
1029         static void *first_failed;
1030         char *ethrotate;
1031
1032         /*
1033          * Do not rotate between network interfaces when
1034          * 'ethrotate' variable is set to 'no'.
1035          */
1036         ethrotate = getenv("ethrotate");
1037         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
1038                 return;
1039
1040         if (!eth_get_dev())
1041                 return;
1042
1043         if (first_restart)
1044                 first_failed = eth_get_dev();
1045
1046         eth_set_current_to_next();
1047
1048         eth_current_changed();
1049
1050         if (first_failed == eth_get_dev())
1051                 net_restart_wrap = 1;
1052 }
1053
1054 void eth_set_current(void)
1055 {
1056         static char *act;
1057         static int  env_changed_id;
1058         int     env_id;
1059
1060         env_id = get_env_id();
1061         if ((act == NULL) || (env_changed_id != env_id)) {
1062                 act = getenv("ethact");
1063                 env_changed_id = env_id;
1064         }
1065
1066         if (act == NULL) {
1067                 char *ethprime = getenv("ethprime");
1068                 void *dev = NULL;
1069
1070                 if (ethprime)
1071                         dev = eth_get_dev_by_name(ethprime);
1072                 if (dev)
1073                         eth_set_dev(dev);
1074                 else
1075                         eth_set_dev(NULL);
1076         } else {
1077                 eth_set_dev(eth_get_dev_by_name(act));
1078         }
1079
1080         eth_current_changed();
1081 }
1082
1083 const char *eth_get_name(void)
1084 {
1085         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1086 }