net: change the env name to use const
[oweals/u-boot.git] / 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         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                 dev = dev->next;
695         } while (dev != eth_devices);
696
697         return 0;
698 }
699 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
700
701 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
702                    int eth_number)
703 {
704         unsigned char env_enetaddr[6];
705         int ret = 0;
706
707         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
708
709         if (!is_zero_ethaddr(env_enetaddr)) {
710                 if (!is_zero_ethaddr(dev->enetaddr) &&
711                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
712                         printf("\nWarning: %s MAC addresses don't match:\n",
713                                dev->name);
714                         printf("Address in SROM is         %pM\n",
715                                dev->enetaddr);
716                         printf("Address in environment is  %pM\n",
717                                env_enetaddr);
718                 }
719
720                 memcpy(dev->enetaddr, env_enetaddr, 6);
721         } else if (is_valid_ethaddr(dev->enetaddr)) {
722                 eth_setenv_enetaddr_by_index(base_name, eth_number,
723                                              dev->enetaddr);
724                 printf("\nWarning: %s using MAC address from net device\n",
725                        dev->name);
726         } else if (is_zero_ethaddr(dev->enetaddr)) {
727 #ifdef CONFIG_NET_RANDOM_ETHADDR
728                 net_random_ethaddr(dev->enetaddr);
729                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
730                        dev->name, eth_number, dev->enetaddr);
731 #else
732                 printf("\nError: %s address not set.\n",
733                        dev->name);
734                 return -EINVAL;
735 #endif
736         }
737
738         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
739                 if (!is_valid_ethaddr(dev->enetaddr)) {
740                         printf("\nError: %s address %pM illegal value\n",
741                                dev->name, dev->enetaddr);
742                         return -EINVAL;
743                 }
744
745                 ret = dev->write_hwaddr(dev);
746                 if (ret)
747                         printf("\nWarning: %s failed to set MAC address\n",
748                                dev->name);
749         }
750
751         return ret;
752 }
753
754 int eth_register(struct eth_device *dev)
755 {
756         struct eth_device *d;
757         static int index;
758
759         assert(strlen(dev->name) < sizeof(dev->name));
760
761         if (!eth_devices) {
762                 eth_devices = dev;
763                 eth_current = dev;
764                 eth_current_changed();
765         } else {
766                 for (d = eth_devices; d->next != eth_devices; d = d->next)
767                         ;
768                 d->next = dev;
769         }
770
771         dev->state = ETH_STATE_INIT;
772         dev->next  = eth_devices;
773         dev->index = index++;
774
775         return 0;
776 }
777
778 int eth_unregister(struct eth_device *dev)
779 {
780         struct eth_device *cur;
781
782         /* No device */
783         if (!eth_devices)
784                 return -ENODEV;
785
786         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
787              cur = cur->next)
788                 ;
789
790         /* Device not found */
791         if (cur->next != dev)
792                 return -ENODEV;
793
794         cur->next = dev->next;
795
796         if (eth_devices == dev)
797                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
798
799         if (eth_current == dev) {
800                 eth_current = eth_devices;
801                 eth_current_changed();
802         }
803
804         return 0;
805 }
806
807 int eth_initialize(void)
808 {
809         int num_devices = 0;
810
811         eth_devices = NULL;
812         eth_current = NULL;
813         eth_common_init();
814
815         if (!eth_devices) {
816                 puts("No ethernet found.\n");
817                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
818         } else {
819                 struct eth_device *dev = eth_devices;
820                 char *ethprime = getenv("ethprime");
821
822                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
823                 do {
824                         if (dev->index)
825                                 puts(", ");
826
827                         printf("%s", dev->name);
828
829                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
830                                 eth_current = dev;
831                                 puts(" [PRIME]");
832                         }
833
834                         if (strchr(dev->name, ' '))
835                                 puts("\nWarning: eth device name has a space!"
836                                         "\n");
837
838                         eth_write_hwaddr(dev, "eth", dev->index);
839
840                         dev = dev->next;
841                         num_devices++;
842                 } while (dev != eth_devices);
843
844                 eth_current_changed();
845                 putc('\n');
846         }
847
848         return num_devices;
849 }
850
851 #ifdef CONFIG_MCAST_TFTP
852 /* Multicast.
853  * mcast_addr: multicast ipaddr from which multicast Mac is made
854  * join: 1=join, 0=leave.
855  */
856 int eth_mcast_join(struct in_addr mcast_ip, int join)
857 {
858         u8 mcast_mac[6];
859         if (!eth_current || !eth_current->mcast)
860                 return -1;
861         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
862         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
863         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
864         mcast_mac[2] = 0x5e;
865         mcast_mac[1] = 0x0;
866         mcast_mac[0] = 0x1;
867         return eth_current->mcast(eth_current, mcast_mac, join);
868 }
869
870 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
871  * and this is the ethernet-crc method needed for TSEC -- and perhaps
872  * some other adapter -- hash tables
873  */
874 #define CRCPOLY_LE 0xedb88320
875 u32 ether_crc(size_t len, unsigned char const *p)
876 {
877         int i;
878         u32 crc;
879         crc = ~0;
880         while (len--) {
881                 crc ^= *p++;
882                 for (i = 0; i < 8; i++)
883                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
884         }
885         /* an reverse the bits, cuz of way they arrive -- last-first */
886         crc = (crc >> 16) | (crc << 16);
887         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
888         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
889         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
890         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
891         return crc;
892 }
893
894 #endif
895
896
897 int eth_init(void)
898 {
899         struct eth_device *old_current;
900
901         if (!eth_current) {
902                 puts("No ethernet found.\n");
903                 return -ENODEV;
904         }
905
906         old_current = eth_current;
907         do {
908                 debug("Trying %s\n", eth_current->name);
909
910                 if (eth_current->init(eth_current, gd->bd) >= 0) {
911                         eth_current->state = ETH_STATE_ACTIVE;
912
913                         return 0;
914                 }
915                 debug("FAIL\n");
916
917                 eth_try_another(0);
918         } while (old_current != eth_current);
919
920         return -ETIMEDOUT;
921 }
922
923 void eth_halt(void)
924 {
925         if (!eth_current)
926                 return;
927
928         eth_current->halt(eth_current);
929
930         eth_current->state = ETH_STATE_PASSIVE;
931 }
932
933 int eth_is_active(struct eth_device *dev)
934 {
935         return dev && dev->state == ETH_STATE_ACTIVE;
936 }
937
938 int eth_send(void *packet, int length)
939 {
940         if (!eth_current)
941                 return -ENODEV;
942
943         return eth_current->send(eth_current, packet, length);
944 }
945
946 int eth_rx(void)
947 {
948         if (!eth_current)
949                 return -ENODEV;
950
951         return eth_current->recv(eth_current);
952 }
953 #endif /* ifndef CONFIG_DM_ETH */
954
955 #ifdef CONFIG_API
956 static void eth_save_packet(void *packet, int length)
957 {
958         char *p = packet;
959         int i;
960
961         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
962                 return;
963
964         if (PKTSIZE < length)
965                 return;
966
967         for (i = 0; i < length; i++)
968                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
969
970         eth_rcv_bufs[eth_rcv_last].length = length;
971         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
972 }
973
974 int eth_receive(void *packet, int length)
975 {
976         char *p = packet;
977         void *pp = push_packet;
978         int i;
979
980         if (eth_rcv_current == eth_rcv_last) {
981                 push_packet = eth_save_packet;
982                 eth_rx();
983                 push_packet = pp;
984
985                 if (eth_rcv_current == eth_rcv_last)
986                         return -1;
987         }
988
989         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
990
991         for (i = 0; i < length; i++)
992                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
993
994         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
995         return length;
996 }
997 #endif /* CONFIG_API */
998
999 static void eth_current_changed(void)
1000 {
1001         char *act = getenv("ethact");
1002         /* update current ethernet name */
1003         if (eth_get_dev()) {
1004                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
1005                         setenv("ethact", eth_get_name());
1006         }
1007         /*
1008          * remove the variable completely if there is no active
1009          * interface
1010          */
1011         else if (act != NULL)
1012                 setenv("ethact", NULL);
1013 }
1014
1015 void eth_try_another(int first_restart)
1016 {
1017         static void *first_failed;
1018         char *ethrotate;
1019
1020         /*
1021          * Do not rotate between network interfaces when
1022          * 'ethrotate' variable is set to 'no'.
1023          */
1024         ethrotate = getenv("ethrotate");
1025         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
1026                 return;
1027
1028         if (!eth_get_dev())
1029                 return;
1030
1031         if (first_restart)
1032                 first_failed = eth_get_dev();
1033
1034         eth_set_current_to_next();
1035
1036         eth_current_changed();
1037
1038         if (first_failed == eth_get_dev())
1039                 net_restart_wrap = 1;
1040 }
1041
1042 void eth_set_current(void)
1043 {
1044         static char *act;
1045         static int  env_changed_id;
1046         int     env_id;
1047
1048         env_id = get_env_id();
1049         if ((act == NULL) || (env_changed_id != env_id)) {
1050                 act = getenv("ethact");
1051                 env_changed_id = env_id;
1052         }
1053
1054         if (act == NULL) {
1055                 char *ethprime = getenv("ethprime");
1056                 void *dev = NULL;
1057
1058                 if (ethprime)
1059                         dev = eth_get_dev_by_name(ethprime);
1060                 if (dev)
1061                         eth_set_dev(dev);
1062                 else
1063                         eth_set_dev(NULL);
1064         } else {
1065                 eth_set_dev(eth_get_dev_by_name(act));
1066         }
1067
1068         eth_current_changed();
1069 }
1070
1071 const char *eth_get_name(void)
1072 {
1073         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1074 }