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