net/eth_legacy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001-2015
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  * Joe Hershberger, National Instruments
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <environment.h>
  11 #include <net.h>
  12 #include <phy.h>
  13 #include <linux/errno.h>
  14 #include "eth_internal.h"
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 /*
  19  * CPU and board-specific Ethernet initializations.  Aliased function
  20  * signals caller to move on
  21  */
  22 static int __def_eth_init(bd_t *bis)
  23 {
  24         return -1;
  25 }
  26 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  27 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  28
  29 #ifdef CONFIG_API
  30 static struct {
  31         uchar data[PKTSIZE];
  32         int length;
  33 } eth_rcv_bufs[PKTBUFSRX];
  34
  35 static unsigned int eth_rcv_current, eth_rcv_last;
  36 #endif
  37
  38 static struct eth_device *eth_devices;
  39 struct eth_device *eth_current;
  40
  41 void eth_set_current_to_next(void)
  42 {
  43         eth_current = eth_current->next;
  44 }
  45
  46 void eth_set_dev(struct eth_device *dev)
  47 {
  48         eth_current = dev;
  49 }
  50
  51 struct eth_device *eth_get_dev_by_name(const char *devname)
  52 {
  53         struct eth_device *dev, *target_dev;
  54
  55         BUG_ON(devname == NULL);
  56
  57         if (!eth_devices)
  58                 return NULL;
  59
  60         dev = eth_devices;
  61         target_dev = NULL;
  62         do {
  63                 if (strcmp(devname, dev->name) == 0) {
  64                         target_dev = dev;
  65                         break;
  66                 }
  67                 dev = dev->next;
  68         } while (dev != eth_devices);
  69
  70         return target_dev;
  71 }
  72
  73 struct eth_device *eth_get_dev_by_index(int index)
  74 {
  75         struct eth_device *dev, *target_dev;
  76
  77         if (!eth_devices)
  78                 return NULL;
  79
  80         dev = eth_devices;
  81         target_dev = NULL;
  82         do {
  83                 if (dev->index == index) {
  84                         target_dev = dev;
  85                         break;
  86                 }
  87                 dev = dev->next;
  88         } while (dev != eth_devices);
  89
  90         return target_dev;
  91 }
  92
  93 int eth_get_dev_index(void)
  94 {
  95         if (!eth_current)
  96                 return -1;
  97
  98         return eth_current->index;
  99 }
 100
 101 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 102         int flags)
 103 {
 104         int index;
 105         struct eth_device *dev;
 106
 107         if (!eth_devices)
 108                 return 0;
 109
 110         /* look for an index after "eth" */
 111         index = simple_strtoul(name + 3, NULL, 10);
 112
 113         dev = eth_devices;
 114         do {
 115                 if (dev->index == index) {
 116                         switch (op) {
 117                         case env_op_create:
 118                         case env_op_overwrite:
 119                                 eth_parse_enetaddr(value, dev->enetaddr);
 120                                 eth_write_hwaddr(dev, "eth", dev->index);
 121                                 break;
 122                         case env_op_delete:
 123                                 memset(dev->enetaddr, 0, ARP_HLEN);
 124                         }
 125                 }
 126                 dev = dev->next;
 127         } while (dev != eth_devices);
 128
 129         return 0;
 130 }
 131 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 132
 133 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 134                    int eth_number)
 135 {
 136         unsigned char env_enetaddr[ARP_HLEN];
 137         int ret = 0;
 138
 139         eth_env_get_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 140
 141         if (!is_zero_ethaddr(env_enetaddr)) {
 142                 if (!is_zero_ethaddr(dev->enetaddr) &&
 143                     memcmp(dev->enetaddr, env_enetaddr, ARP_HLEN)) {
 144                         printf("\nWarning: %s MAC addresses don't match:\n",
 145                                dev->name);
 146                         printf("Address in SROM is         %pM\n",
 147                                dev->enetaddr);
 148                         printf("Address in environment is  %pM\n",
 149                                env_enetaddr);
 150                 }
 151
 152                 memcpy(dev->enetaddr, env_enetaddr, ARP_HLEN);
 153         } else if (is_valid_ethaddr(dev->enetaddr)) {
 154                 eth_env_set_enetaddr_by_index(base_name, eth_number,
 155                                               dev->enetaddr);
 156         } else if (is_zero_ethaddr(dev->enetaddr)) {
 157 #ifdef CONFIG_NET_RANDOM_ETHADDR
 158                 net_random_ethaddr(dev->enetaddr);
 159                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 160                        dev->name, eth_number, dev->enetaddr);
 161 #else
 162                 printf("\nError: %s address not set.\n",
 163                        dev->name);
 164                 return -EINVAL;
 165 #endif
 166         }
 167
 168         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 169                 if (!is_valid_ethaddr(dev->enetaddr)) {
 170                         printf("\nError: %s address %pM illegal value\n",
 171                                dev->name, dev->enetaddr);
 172                         return -EINVAL;
 173                 }
 174
 175                 ret = dev->write_hwaddr(dev);
 176                 if (ret)
 177                         printf("\nWarning: %s failed to set MAC address\n",
 178                                dev->name);
 179         }
 180
 181         return ret;
 182 }
 183
 184 int eth_register(struct eth_device *dev)
 185 {
 186         struct eth_device *d;
 187         static int index;
 188
 189         assert(strlen(dev->name) < sizeof(dev->name));
 190
 191         if (!eth_devices) {
 192                 eth_devices = dev;
 193                 eth_current = dev;
 194                 eth_current_changed();
 195         } else {
 196                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 197                         ;
 198                 d->next = dev;
 199         }
 200
 201         dev->state = ETH_STATE_INIT;
 202         dev->next  = eth_devices;
 203         dev->index = index++;
 204
 205         return 0;
 206 }
 207
 208 int eth_unregister(struct eth_device *dev)
 209 {
 210         struct eth_device *cur;
 211
 212         /* No device */
 213         if (!eth_devices)
 214                 return -ENODEV;
 215
 216         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 217              cur = cur->next)
 218                 ;
 219
 220         /* Device not found */
 221         if (cur->next != dev)
 222                 return -ENODEV;
 223
 224         cur->next = dev->next;
 225
 226         if (eth_devices == dev)
 227                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 228
 229         if (eth_current == dev) {
 230                 eth_current = eth_devices;
 231                 eth_current_changed();
 232         }
 233
 234         return 0;
 235 }
 236
 237 int eth_initialize(void)
 238 {
 239         int num_devices = 0;
 240
 241         eth_devices = NULL;
 242         eth_current = NULL;
 243         eth_common_init();
 244         /*
 245          * If board-specific initialization exists, call it.
 246          * If not, call a CPU-specific one
 247          */
 248         if (board_eth_init != __def_eth_init) {
 249                 if (board_eth_init(gd->bd) < 0)
 250                         printf("Board Net Initialization Failed\n");
 251         } else if (cpu_eth_init != __def_eth_init) {
 252                 if (cpu_eth_init(gd->bd) < 0)
 253                         printf("CPU Net Initialization Failed\n");
 254         } else {
 255                 printf("Net Initialization Skipped\n");
 256         }
 257
 258         if (!eth_devices) {
 259                 puts("No ethernet found.\n");
 260                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 261         } else {
 262                 struct eth_device *dev = eth_devices;
 263                 char *ethprime = env_get("ethprime");
 264
 265                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 266                 do {
 267                         if (dev->index)
 268                                 puts(", ");
 269
 270                         printf("%s", dev->name);
 271
 272                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 273                                 eth_current = dev;
 274                                 puts(" [PRIME]");
 275                         }
 276
 277                         if (strchr(dev->name, ' '))
 278                                 puts("\nWarning: eth device name has a space!"
 279                                         "\n");
 280
 281                         eth_write_hwaddr(dev, "eth", dev->index);
 282
 283                         dev = dev->next;
 284                         num_devices++;
 285                 } while (dev != eth_devices);
 286
 287                 eth_current_changed();
 288                 putc('\n');
 289         }
 290
 291         return num_devices;
 292 }
 293
 294 #ifdef CONFIG_MCAST_TFTP
 295 /* Multicast.
 296  * mcast_addr: multicast ipaddr from which multicast Mac is made
 297  * join: 1=join, 0=leave.
 298  */
 299 int eth_mcast_join(struct in_addr mcast_ip, int join)
 300 {
 301         u8 mcast_mac[ARP_HLEN];
 302         if (!eth_current || !eth_current->mcast)
 303                 return -1;
 304         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 305         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 306         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 307         mcast_mac[2] = 0x5e;
 308         mcast_mac[1] = 0x0;
 309         mcast_mac[0] = 0x1;
 310         return eth_current->mcast(eth_current, mcast_mac, join);
 311 }
 312
 313 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 314  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 315  * some other adapter -- hash tables
 316  */
 317 #define CRCPOLY_LE 0xedb88320
 318 u32 ether_crc(size_t len, unsigned char const *p)
 319 {
 320         int i;
 321         u32 crc;
 322         crc = ~0;
 323         while (len--) {
 324                 crc ^= *p++;
 325                 for (i = 0; i < 8; i++)
 326                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 327         }
 328         /* an reverse the bits, cuz of way they arrive -- last-first */
 329         crc = (crc >> 16) | (crc << 16);
 330         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 331         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 332         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 333         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 334         return crc;
 335 }
 336
 337 #endif
 338
 339
 340 int eth_init(void)
 341 {
 342         struct eth_device *old_current;
 343
 344         if (!eth_current) {
 345                 puts("No ethernet found.\n");
 346                 return -ENODEV;
 347         }
 348
 349         old_current = eth_current;
 350         do {
 351                 debug("Trying %s\n", eth_current->name);
 352
 353                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 354                         eth_current->state = ETH_STATE_ACTIVE;
 355
 356                         return 0;
 357                 }
 358                 debug("FAIL\n");
 359
 360                 eth_try_another(0);
 361         } while (old_current != eth_current);
 362
 363         return -ETIMEDOUT;
 364 }
 365
 366 void eth_halt(void)
 367 {
 368         if (!eth_current)
 369                 return;
 370
 371         eth_current->halt(eth_current);
 372
 373         eth_current->state = ETH_STATE_PASSIVE;
 374 }
 375
 376 int eth_is_active(struct eth_device *dev)
 377 {
 378         return dev && dev->state == ETH_STATE_ACTIVE;
 379 }
 380
 381 int eth_send(void *packet, int length)
 382 {
 383         if (!eth_current)
 384                 return -ENODEV;
 385
 386         return eth_current->send(eth_current, packet, length);
 387 }
 388
 389 int eth_rx(void)
 390 {
 391         if (!eth_current)
 392                 return -ENODEV;
 393
 394         return eth_current->recv(eth_current);
 395 }
 396
 397 #ifdef CONFIG_API
 398 static void eth_save_packet(void *packet, int length)
 399 {
 400         char *p = packet;
 401         int i;
 402
 403         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 404                 return;
 405
 406         if (PKTSIZE < length)
 407                 return;
 408
 409         for (i = 0; i < length; i++)
 410                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 411
 412         eth_rcv_bufs[eth_rcv_last].length = length;
 413         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 414 }
 415
 416 int eth_receive(void *packet, int length)
 417 {
 418         char *p = packet;
 419         void *pp = push_packet;
 420         int i;
 421
 422         if (eth_rcv_current == eth_rcv_last) {
 423                 push_packet = eth_save_packet;
 424                 eth_rx();
 425                 push_packet = pp;
 426
 427                 if (eth_rcv_current == eth_rcv_last)
 428                         return -1;
 429         }
 430
 431         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 432
 433         for (i = 0; i < length; i++)
 434                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 435
 436         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 437         return length;
 438 }
 439 #endif /* CONFIG_API */