forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathlance.c
1303 lines (1114 loc) · 40.3 KB
/
lance.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* lance.c: An AMD LANCE/PCnet ethernet driver for Linux. */
/*
Written/copyright 1993-1998 by Donald Becker.
Copyright 1993 United States Government as represented by the
Director, National Security Agency.
This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
This driver is for the Allied Telesis AT1500 and HP J2405A, and should work
with most other LANCE-based bus-master (NE2100/NE2500) ethercards.
The author may be reached as [email protected], or C/O
Scyld Computing Corporation
410 Severn Ave., Suite 210
Annapolis MD 21403
Andrey V. Savochkin:
- alignment problem with 1.3.* kernel and some minor changes.
Thomas Bogendoerfer ([email protected]):
- added support for Linux/Alpha, but removed most of it, because
it worked only for the PCI chip.
- added hook for the 32bit lance driver
- added PCnetPCI II (79C970A) to chip table
Paul Gortmaker ([email protected]):
- hopefully fix above so Linux/Alpha can use ISA cards too.
8/20/96 Fixed 7990 autoIRQ failure and reversed unneeded alignment -djb
v1.12 10/27/97 Module support -djb
v1.14 2/3/98 Module support modified, made PCI support optional -djb
v1.15 5/27/99 Fixed bug in the cleanup_module(). dev->priv was freed
before unregister_netdev() which caused NULL pointer
reference later in the chain (in rtnetlink_fill_ifinfo())
-- Mika Kuoppala <[email protected]>
Forward ported v1.14 to 2.1.129, merged the PCI and misc changes from
the 2.1 version of the old driver - Alan Cox
Get rid of check_region, check kmalloc return in lance_probe1
Arnaldo Carvalho de Melo <[email protected]> - 11/01/2001
Reworked detection, added support for Racal InterLan EtherBlaster cards
Vesselin Kostadinov <vesok at yahoo dot com > - 22/4/2004
*/
static const char version[] = "lance.c:v1.15ac 1999/11/13 [email protected], [email protected]\n";
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
static unsigned int lance_portlist[] __initdata = { 0x300, 0x320, 0x340, 0x360, 0};
static int lance_probe1(struct net_device *dev, int ioaddr, int irq, int options);
static int __init do_lance_probe(struct net_device *dev);
static struct card {
char id_offset14;
char id_offset15;
} cards[] = {
{ //"normal"
.id_offset14 = 0x57,
.id_offset15 = 0x57,
},
{ //NI6510EB
.id_offset14 = 0x52,
.id_offset15 = 0x44,
},
{ //Racal InterLan EtherBlaster
.id_offset14 = 0x52,
.id_offset15 = 0x49,
},
};
#define NUM_CARDS 3
#ifdef LANCE_DEBUG
static int lance_debug = LANCE_DEBUG;
#else
static int lance_debug = 1;
#endif
/*
Theory of Operation
I. Board Compatibility
This device driver is designed for the AMD 79C960, the "PCnet-ISA
single-chip ethernet controller for ISA". This chip is used in a wide
variety of boards from vendors such as Allied Telesis, HP, Kingston,
and Boca. This driver is also intended to work with older AMD 7990
designs, such as the NE1500 and NE2100, and newer 79C961. For convenience,
I use the name LANCE to refer to all of the AMD chips, even though it properly
refers only to the original 7990.
II. Board-specific settings
The driver is designed to work the boards that use the faster
bus-master mode, rather than in shared memory mode. (Only older designs
have on-board buffer memory needed to support the slower shared memory mode.)
Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
channel. This driver probes the likely base addresses:
{0x300, 0x320, 0x340, 0x360}.
After the board is found it generates a DMA-timeout interrupt and uses
autoIRQ to find the IRQ line. The DMA channel can be set with the low bits
of the otherwise-unused dev->mem_start value (aka PARAM1). If unset it is
probed for by enabling each free DMA channel in turn and checking if
initialization succeeds.
The HP-J2405A board is an exception: with this board it is easy to read the
EEPROM-set values for the base, IRQ, and DMA. (Of course you must already
_know_ the base address -- that field is for writing the EEPROM.)
III. Driver operation
IIIa. Ring buffers
The LANCE uses ring buffers of Tx and Rx descriptors. Each entry describes
the base and length of the data buffer, along with status bits. The length
of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
the buffer length (rather than being directly the buffer length) for
implementation ease. The current values are 2 (Tx) and 4 (Rx), which leads to
ring sizes of 4 (Tx) and 16 (Rx). Increasing the number of ring entries
needlessly uses extra space and reduces the chance that an upper layer will
be able to reorder queued Tx packets based on priority. Decreasing the number
of entries makes it more difficult to achieve back-to-back packet transmission
and increases the chance that Rx ring will overflow. (Consider the worst case
of receiving back-to-back minimum-sized packets.)
The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
avoid the administrative overhead. For the Rx side this avoids dynamically
allocating full-sized buffers "just in case", at the expense of a
memory-to-memory data copy for each packet received. For most systems this
is a good tradeoff: the Rx buffer will always be in low memory, the copy
is inexpensive, and it primes the cache for later packet processing. For Tx
the buffers are only used when needed as low-memory bounce buffers.
IIIB. 16M memory limitations.
For the ISA bus master mode all structures used directly by the LANCE,
the initialization block, Rx and Tx rings, and data buffers, must be
accessible from the ISA bus, i.e. in the lower 16M of real memory.
This is a problem for current Linux kernels on >16M machines. The network
devices are initialized after memory initialization, and the kernel doles out
memory from the top of memory downward. The current solution is to have a
special network initialization routine that's called before memory
initialization; this will eventually be generalized for all network devices.
As mentioned before, low-memory "bounce-buffers" are used when needed.
IIIC. Synchronization
The driver runs as two independent, single-threaded flows of control. One
is the send-packet routine, which enforces single-threaded use by the
dev->tbusy flag. The other thread is the interrupt handler, which is single
threaded by the hardware and other software.
The send packet thread has partial control over the Tx ring and 'dev->tbusy'
flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next
queue slot is empty, it clears the tbusy flag when finished otherwise it sets
the 'lp->tx_full' flag.
The interrupt handler has exclusive control over the Rx ring and records stats
from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so
we can't avoid the interrupt overhead by having the Tx routine reap the Tx
stats.) After reaping the stats, it marks the queue entry as empty by setting
the 'base' to zero. Iff the 'lp->tx_full' flag is set, it clears both the
tx_full and tbusy flags.
*/
/* Set the number of Tx and Rx buffers, using Log_2(# buffers).
Reasonable default values are 16 Tx buffers, and 16 Rx buffers.
That translates to 4 and 4 (16 == 2^^4).
This is a compile-time option for efficiency.
*/
#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 4
#define LANCE_LOG_RX_BUFFERS 4
#endif
#define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
#define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29)
#define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29)
#define PKT_BUF_SZ 1544
/* Offsets from base I/O address. */
#define LANCE_DATA 0x10
#define LANCE_ADDR 0x12
#define LANCE_RESET 0x14
#define LANCE_BUS_IF 0x16
#define LANCE_TOTAL_SIZE 0x18
#define TX_TIMEOUT 20
/* The LANCE Rx and Tx ring descriptors. */
struct lance_rx_head {
s32 base;
s16 buf_length; /* This length is 2s complement (negative)! */
s16 msg_length; /* This length is "normal". */
};
struct lance_tx_head {
s32 base;
s16 length; /* Length is 2s complement (negative)! */
s16 misc;
};
/* The LANCE initialization block, described in databook. */
struct lance_init_block {
u16 mode; /* Pre-set mode (reg. 15) */
u8 phys_addr[6]; /* Physical ethernet address */
u32 filter[2]; /* Multicast filter (unused). */
/* Receive and transmit ring base, along with extra bits. */
u32 rx_ring; /* Tx and Rx ring base pointers */
u32 tx_ring;
};
struct lance_private {
/* The Tx and Rx ring entries must be aligned on 8-byte boundaries. */
struct lance_rx_head rx_ring[RX_RING_SIZE];
struct lance_tx_head tx_ring[TX_RING_SIZE];
struct lance_init_block init_block;
const char *name;
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
struct sk_buff* tx_skbuff[TX_RING_SIZE];
/* The addresses of receive-in-place skbuffs. */
struct sk_buff* rx_skbuff[RX_RING_SIZE];
unsigned long rx_buffs; /* Address of Rx and Tx buffers. */
/* Tx low-memory "bounce buffer" address. */
char (*tx_bounce_buffs)[PKT_BUF_SZ];
int cur_rx, cur_tx; /* The next free ring entry */
int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
int dma;
struct net_device_stats stats;
unsigned char chip_version; /* See lance_chip_type. */
spinlock_t devlock;
};
#define LANCE_MUST_PAD 0x00000001
#define LANCE_ENABLE_AUTOSELECT 0x00000002
#define LANCE_MUST_REINIT_RING 0x00000004
#define LANCE_MUST_UNRESET 0x00000008
#define LANCE_HAS_MISSED_FRAME 0x00000010
/* A mapping from the chip ID number to the part number and features.
These are from the datasheets -- in real life the '970 version
reportedly has the same ID as the '965. */
static struct lance_chip_type {
int id_number;
const char *name;
int flags;
} chip_table[] = {
{0x0000, "LANCE 7990", /* Ancient lance chip. */
LANCE_MUST_PAD + LANCE_MUST_UNRESET},
{0x0003, "PCnet/ISA 79C960", /* 79C960 PCnet/ISA. */
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
{0x2260, "PCnet/ISA+ 79C961", /* 79C961 PCnet/ISA+, Plug-n-Play. */
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
{0x2420, "PCnet/PCI 79C970", /* 79C970 or 79C974 PCnet-SCSI, PCI. */
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
/* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
it the PCnet32. */
{0x2430, "PCnet32", /* 79C965 PCnet for VL bus. */
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
{0x2621, "PCnet/PCI-II 79C970A", /* 79C970A PCInetPCI II. */
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
{0x0, "PCnet (unknown)",
LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
LANCE_HAS_MISSED_FRAME},
};
enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, PCNET_PCI_II=5, LANCE_UNKNOWN=6};
/* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers.
Assume yes until we know the memory size. */
static unsigned char lance_need_isa_bounce_buffers = 1;
static int lance_open(struct net_device *dev);
static void lance_init_ring(struct net_device *dev, gfp_t mode);
static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int lance_rx(struct net_device *dev);
static irqreturn_t lance_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int lance_close(struct net_device *dev);
static struct net_device_stats *lance_get_stats(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
static void lance_tx_timeout (struct net_device *dev);
static void cleanup_card(struct net_device *dev)
{
struct lance_private *lp = dev->priv;
if (dev->dma != 4)
free_dma(dev->dma);
release_region(dev->base_addr, LANCE_TOTAL_SIZE);
kfree(lp->tx_bounce_buffs);
kfree((void*)lp->rx_buffs);
kfree(lp);
}
#ifdef MODULE
#define MAX_CARDS 8 /* Max number of interfaces (cards) per module */
static struct net_device *dev_lance[MAX_CARDS];
static int io[MAX_CARDS];
static int dma[MAX_CARDS];
static int irq[MAX_CARDS];
module_param_array(io, int, NULL, 0);
module_param_array(dma, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param(lance_debug, int, 0);
MODULE_PARM_DESC(io, "LANCE/PCnet I/O base address(es),required");
MODULE_PARM_DESC(dma, "LANCE/PCnet ISA DMA channel (ignored for some devices)");
MODULE_PARM_DESC(irq, "LANCE/PCnet IRQ number (ignored for some devices)");
MODULE_PARM_DESC(lance_debug, "LANCE/PCnet debug level (0-7)");
int init_module(void)
{
struct net_device *dev;
int this_dev, found = 0;
for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
if (io[this_dev] == 0) {
if (this_dev != 0) /* only complain once */
break;
printk(KERN_NOTICE "lance.c: Module autoprobing not allowed. Append \"io=0xNNN\" value(s).\n");
return -EPERM;
}
dev = alloc_etherdev(0);
if (!dev)
break;
dev->irq = irq[this_dev];
dev->base_addr = io[this_dev];
dev->dma = dma[this_dev];
if (do_lance_probe(dev) == 0) {
dev_lance[found++] = dev;
continue;
}
free_netdev(dev);
break;
}
if (found != 0)
return 0;
return -ENXIO;
}
void cleanup_module(void)
{
int this_dev;
for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
struct net_device *dev = dev_lance[this_dev];
if (dev) {
unregister_netdev(dev);
cleanup_card(dev);
free_netdev(dev);
}
}
}
#endif /* MODULE */
MODULE_LICENSE("GPL");
/* Starting in v2.1.*, the LANCE/PCnet probe is now similar to the other
board probes now that kmalloc() can allocate ISA DMA-able regions.
This also allows the LANCE driver to be used as a module.
*/
static int __init do_lance_probe(struct net_device *dev)
{
int *port, result;
if (high_memory <= phys_to_virt(16*1024*1024))
lance_need_isa_bounce_buffers = 0;
for (port = lance_portlist; *port; port++) {
int ioaddr = *port;
struct resource *r = request_region(ioaddr, LANCE_TOTAL_SIZE,
"lance-probe");
if (r) {
/* Detect the card with minimal I/O reads */
char offset14 = inb(ioaddr + 14);
int card;
for (card = 0; card < NUM_CARDS; ++card)
if (cards[card].id_offset14 == offset14)
break;
if (card < NUM_CARDS) {/*yes, the first byte matches*/
char offset15 = inb(ioaddr + 15);
for (card = 0; card < NUM_CARDS; ++card)
if ((cards[card].id_offset14 == offset14) &&
(cards[card].id_offset15 == offset15))
break;
}
if (card < NUM_CARDS) { /*Signature OK*/
result = lance_probe1(dev, ioaddr, 0, 0);
if (!result) {
struct lance_private *lp = dev->priv;
int ver = lp->chip_version;
r->name = chip_table[ver].name;
return 0;
}
}
release_region(ioaddr, LANCE_TOTAL_SIZE);
}
}
return -ENODEV;
}
#ifndef MODULE
struct net_device * __init lance_probe(int unit)
{
struct net_device *dev = alloc_etherdev(0);
int err;
if (!dev)
return ERR_PTR(-ENODEV);
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
err = do_lance_probe(dev);
if (err)
goto out;
return dev;
out:
free_netdev(dev);
return ERR_PTR(err);
}
#endif
static int __init lance_probe1(struct net_device *dev, int ioaddr, int irq, int options)
{
struct lance_private *lp;
long dma_channels; /* Mark spuriously-busy DMA channels */
int i, reset_val, lance_version;
const char *chipname;
/* Flags for specific chips or boards. */
unsigned char hpJ2405A = 0; /* HP ISA adaptor */
int hp_builtin = 0; /* HP on-board ethernet. */
static int did_version; /* Already printed version info. */
unsigned long flags;
int err = -ENOMEM;
/* First we look for special cases.
Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
There are two HP versions, check the BIOS for the configuration port.
This method provided by L. Julliard, [email protected].
*/
if (isa_readw(0x000f0102) == 0x5048) {
static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
int hp_port = (isa_readl(0x000f00f1) & 1) ? 0x499 : 0x99;
/* We can have boards other than the built-in! Verify this is on-board. */
if ((inb(hp_port) & 0xc0) == 0x80
&& ioaddr_table[inb(hp_port) & 3] == ioaddr)
hp_builtin = hp_port;
}
/* We also recognize the HP Vectra on-board here, but check below. */
hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
&& inb(ioaddr+2) == 0x09);
/* Reset the LANCE. */
reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
/* The Un-Reset needed is only needed for the real NE2100, and will
confuse the HP board. */
if (!hpJ2405A)
outw(reset_val, ioaddr+LANCE_RESET);
outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
if (inw(ioaddr+LANCE_DATA) != 0x0004)
return -ENODEV;
/* Get the version of the chip. */
outw(88, ioaddr+LANCE_ADDR);
if (inw(ioaddr+LANCE_ADDR) != 88) {
lance_version = 0;
} else { /* Good, it's a newer chip. */
int chip_version = inw(ioaddr+LANCE_DATA);
outw(89, ioaddr+LANCE_ADDR);
chip_version |= inw(ioaddr+LANCE_DATA) << 16;
if (lance_debug > 2)
printk(" LANCE chip version is %#x.\n", chip_version);
if ((chip_version & 0xfff) != 0x003)
return -ENODEV;
chip_version = (chip_version >> 12) & 0xffff;
for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
if (chip_table[lance_version].id_number == chip_version)
break;
}
}
/* We can't allocate dev->priv from alloc_etherdev() because it must
a ISA DMA-able region. */
SET_MODULE_OWNER(dev);
chipname = chip_table[lance_version].name;
printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
/* There is a 16 byte station address PROM at the base address.
The first six bytes are the station address. */
for (i = 0; i < 6; i++)
printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
dev->base_addr = ioaddr;
/* Make certain the data structures used by the LANCE are aligned and DMAble. */
lp = kmalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
if(lp==NULL)
return -ENODEV;
if (lance_debug > 6) printk(" (#0x%05lx)", (unsigned long)lp);
memset(lp, 0, sizeof(*lp));
dev->priv = lp;
lp->name = chipname;
lp->rx_buffs = (unsigned long)kmalloc(PKT_BUF_SZ*RX_RING_SIZE,
GFP_DMA | GFP_KERNEL);
if (!lp->rx_buffs)
goto out_lp;
if (lance_need_isa_bounce_buffers) {
lp->tx_bounce_buffs = kmalloc(PKT_BUF_SZ*TX_RING_SIZE,
GFP_DMA | GFP_KERNEL);
if (!lp->tx_bounce_buffs)
goto out_rx;
} else
lp->tx_bounce_buffs = NULL;
lp->chip_version = lance_version;
spin_lock_init(&lp->devlock);
lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */
for (i = 0; i < 6; i++)
lp->init_block.phys_addr[i] = dev->dev_addr[i];
lp->init_block.filter[0] = 0x00000000;
lp->init_block.filter[1] = 0x00000000;
lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
outw(0x0001, ioaddr+LANCE_ADDR);
inw(ioaddr+LANCE_ADDR);
outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
outw(0x0002, ioaddr+LANCE_ADDR);
inw(ioaddr+LANCE_ADDR);
outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
outw(0x0000, ioaddr+LANCE_ADDR);
inw(ioaddr+LANCE_ADDR);
if (irq) { /* Set iff PCI card. */
dev->dma = 4; /* Native bus-master, no DMA channel needed. */
dev->irq = irq;
} else if (hp_builtin) {
static const char dma_tbl[4] = {3, 5, 6, 0};
static const char irq_tbl[4] = {3, 4, 5, 9};
unsigned char port_val = inb(hp_builtin);
dev->dma = dma_tbl[(port_val >> 4) & 3];
dev->irq = irq_tbl[(port_val >> 2) & 3];
printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
} else if (hpJ2405A) {
static const char dma_tbl[4] = {3, 5, 6, 7};
static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
short reset_val = inw(ioaddr+LANCE_RESET);
dev->dma = dma_tbl[(reset_val >> 2) & 3];
dev->irq = irq_tbl[(reset_val >> 4) & 7];
printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
} else if (lance_version == PCNET_ISAP) { /* The plug-n-play version. */
short bus_info;
outw(8, ioaddr+LANCE_ADDR);
bus_info = inw(ioaddr+LANCE_BUS_IF);
dev->dma = bus_info & 0x07;
dev->irq = (bus_info >> 4) & 0x0F;
} else {
/* The DMA channel may be passed in PARAM1. */
if (dev->mem_start & 0x07)
dev->dma = dev->mem_start & 0x07;
}
if (dev->dma == 0) {
/* Read the DMA channel status register, so that we can avoid
stuck DMA channels in the DMA detection below. */
dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
(inb(DMA2_STAT_REG) & 0xf0);
}
err = -ENODEV;
if (dev->irq >= 2)
printk(" assigned IRQ %d", dev->irq);
else if (lance_version != 0) { /* 7990 boards need DMA detection first. */
unsigned long irq_mask;
/* To auto-IRQ we enable the initialization-done and DMA error
interrupts. For ISA boards we get a DMA error, but VLB and PCI
boards will work. */
irq_mask = probe_irq_on();
/* Trigger an initialization just for the interrupt. */
outw(0x0041, ioaddr+LANCE_DATA);
mdelay(20);
dev->irq = probe_irq_off(irq_mask);
if (dev->irq)
printk(", probed IRQ %d", dev->irq);
else {
printk(", failed to detect IRQ line.\n");
goto out_tx;
}
/* Check for the initialization done bit, 0x0100, which means
that we don't need a DMA channel. */
if (inw(ioaddr+LANCE_DATA) & 0x0100)
dev->dma = 4;
}
if (dev->dma == 4) {
printk(", no DMA needed.\n");
} else if (dev->dma) {
if (request_dma(dev->dma, chipname)) {
printk("DMA %d allocation failed.\n", dev->dma);
goto out_tx;
} else
printk(", assigned DMA %d.\n", dev->dma);
} else { /* OK, we have to auto-DMA. */
for (i = 0; i < 4; i++) {
static const char dmas[] = { 5, 6, 7, 3 };
int dma = dmas[i];
int boguscnt;
/* Don't enable a permanently busy DMA channel, or the machine
will hang. */
if (test_bit(dma, &dma_channels))
continue;
outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
if (request_dma(dma, chipname))
continue;
flags=claim_dma_lock();
set_dma_mode(dma, DMA_MODE_CASCADE);
enable_dma(dma);
release_dma_lock(flags);
/* Trigger an initialization. */
outw(0x0001, ioaddr+LANCE_DATA);
for (boguscnt = 100; boguscnt > 0; --boguscnt)
if (inw(ioaddr+LANCE_DATA) & 0x0900)
break;
if (inw(ioaddr+LANCE_DATA) & 0x0100) {
dev->dma = dma;
printk(", DMA %d.\n", dev->dma);
break;
} else {
flags=claim_dma_lock();
disable_dma(dma);
release_dma_lock(flags);
free_dma(dma);
}
}
if (i == 4) { /* Failure: bail. */
printk("DMA detection failed.\n");
goto out_tx;
}
}
if (lance_version == 0 && dev->irq == 0) {
/* We may auto-IRQ now that we have a DMA channel. */
/* Trigger an initialization just for the interrupt. */
unsigned long irq_mask;
irq_mask = probe_irq_on();
outw(0x0041, ioaddr+LANCE_DATA);
mdelay(40);
dev->irq = probe_irq_off(irq_mask);
if (dev->irq == 0) {
printk(" Failed to detect the 7990 IRQ line.\n");
goto out_dma;
}
printk(" Auto-IRQ detected IRQ%d.\n", dev->irq);
}
if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
/* Turn on auto-select of media (10baseT or BNC) so that the user
can watch the LEDs even if the board isn't opened. */
outw(0x0002, ioaddr+LANCE_ADDR);
/* Don't touch 10base2 power bit. */
outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
}
if (lance_debug > 0 && did_version++ == 0)
printk(version);
/* The LANCE-specific entries in the device structure. */
dev->open = lance_open;
dev->hard_start_xmit = lance_start_xmit;
dev->stop = lance_close;
dev->get_stats = lance_get_stats;
dev->set_multicast_list = set_multicast_list;
dev->tx_timeout = lance_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
err = register_netdev(dev);
if (err)
goto out_dma;
return 0;
out_dma:
if (dev->dma != 4)
free_dma(dev->dma);
out_tx:
kfree(lp->tx_bounce_buffs);
out_rx:
kfree((void*)lp->rx_buffs);
out_lp:
kfree(lp);
return err;
}
static int
lance_open(struct net_device *dev)
{
struct lance_private *lp = dev->priv;
int ioaddr = dev->base_addr;
int i;
if (dev->irq == 0 ||
request_irq(dev->irq, &lance_interrupt, 0, lp->name, dev)) {
return -EAGAIN;
}
/* We used to allocate DMA here, but that was silly.
DMA lines can't be shared! We now permanently allocate them. */
/* Reset the LANCE */
inw(ioaddr+LANCE_RESET);
/* The DMA controller is used as a no-operation slave, "cascade mode". */
if (dev->dma != 4) {
unsigned long flags=claim_dma_lock();
enable_dma(dev->dma);
set_dma_mode(dev->dma, DMA_MODE_CASCADE);
release_dma_lock(flags);
}
/* Un-Reset the LANCE, needed only for the NE2100. */
if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET)
outw(0, ioaddr+LANCE_RESET);
if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
/* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
outw(0x0002, ioaddr+LANCE_ADDR);
/* Only touch autoselect bit. */
outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
}
if (lance_debug > 1)
printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
dev->name, dev->irq, dev->dma,
(u32) isa_virt_to_bus(lp->tx_ring),
(u32) isa_virt_to_bus(lp->rx_ring),
(u32) isa_virt_to_bus(&lp->init_block));
lance_init_ring(dev, GFP_KERNEL);
/* Re-initialize the LANCE, and start it when done. */
outw(0x0001, ioaddr+LANCE_ADDR);
outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
outw(0x0002, ioaddr+LANCE_ADDR);
outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
outw(0x0004, ioaddr+LANCE_ADDR);
outw(0x0915, ioaddr+LANCE_DATA);
outw(0x0000, ioaddr+LANCE_ADDR);
outw(0x0001, ioaddr+LANCE_DATA);
netif_start_queue (dev);
i = 0;
while (i++ < 100)
if (inw(ioaddr+LANCE_DATA) & 0x0100)
break;
/*
* We used to clear the InitDone bit, 0x0100, here but Mark Stockton
* reports that doing so triggers a bug in the '974.
*/
outw(0x0042, ioaddr+LANCE_DATA);
if (lance_debug > 2)
printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
dev->name, i, (u32) isa_virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA));
return 0; /* Always succeed */
}
/* The LANCE has been halted for one reason or another (busmaster memory
arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
etc.). Modern LANCE variants always reload their ring-buffer
configuration when restarted, so we must reinitialize our ring
context before restarting. As part of this reinitialization,
find all packets still on the Tx ring and pretend that they had been
sent (in effect, drop the packets on the floor) - the higher-level
protocols will time out and retransmit. It'd be better to shuffle
these skbs to a temp list and then actually re-Tx them after
restarting the chip, but I'm too lazy to do so right now. [email protected]
*/
static void
lance_purge_ring(struct net_device *dev)
{
struct lance_private *lp = dev->priv;
int i;
/* Free all the skbuffs in the Rx and Tx queues. */
for (i = 0; i < RX_RING_SIZE; i++) {
struct sk_buff *skb = lp->rx_skbuff[i];
lp->rx_skbuff[i] = NULL;
lp->rx_ring[i].base = 0; /* Not owned by LANCE chip. */
if (skb)
dev_kfree_skb_any(skb);
}
for (i = 0; i < TX_RING_SIZE; i++) {
if (lp->tx_skbuff[i]) {
dev_kfree_skb_any(lp->tx_skbuff[i]);
lp->tx_skbuff[i] = NULL;
}
}
}
/* Initialize the LANCE Rx and Tx rings. */
static void
lance_init_ring(struct net_device *dev, gfp_t gfp)
{
struct lance_private *lp = dev->priv;
int i;
lp->cur_rx = lp->cur_tx = 0;
lp->dirty_rx = lp->dirty_tx = 0;
for (i = 0; i < RX_RING_SIZE; i++) {
struct sk_buff *skb;
void *rx_buff;
skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
lp->rx_skbuff[i] = skb;
if (skb) {
skb->dev = dev;
rx_buff = skb->data;
} else
rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
if (rx_buff == NULL)
lp->rx_ring[i].base = 0;
else
lp->rx_ring[i].base = (u32)isa_virt_to_bus(rx_buff) | 0x80000000;
lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
}
/* The Tx buffer address is filled in as needed, but we do need to clear
the upper ownership bit. */
for (i = 0; i < TX_RING_SIZE; i++) {
lp->tx_skbuff[i] = NULL;
lp->tx_ring[i].base = 0;
}
lp->init_block.mode = 0x0000;
for (i = 0; i < 6; i++)
lp->init_block.phys_addr[i] = dev->dev_addr[i];
lp->init_block.filter[0] = 0x00000000;
lp->init_block.filter[1] = 0x00000000;
lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
}
static void
lance_restart(struct net_device *dev, unsigned int csr0_bits, int must_reinit)
{
struct lance_private *lp = dev->priv;
if (must_reinit ||
(chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) {
lance_purge_ring(dev);
lance_init_ring(dev, GFP_ATOMIC);
}
outw(0x0000, dev->base_addr + LANCE_ADDR);
outw(csr0_bits, dev->base_addr + LANCE_DATA);
}
static void lance_tx_timeout (struct net_device *dev)
{
struct lance_private *lp = (struct lance_private *) dev->priv;
int ioaddr = dev->base_addr;
outw (0, ioaddr + LANCE_ADDR);
printk ("%s: transmit timed out, status %4.4x, resetting.\n",
dev->name, inw (ioaddr + LANCE_DATA));
outw (0x0004, ioaddr + LANCE_DATA);
lp->stats.tx_errors++;
#ifndef final_version
if (lance_debug > 3) {
int i;
printk (" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
lp->dirty_tx, lp->cur_tx, netif_queue_stopped(dev) ? " (full)" : "",
lp->cur_rx);
for (i = 0; i < RX_RING_SIZE; i++)
printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
lp->rx_ring[i].msg_length);
for (i = 0; i < TX_RING_SIZE; i++)
printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
lp->tx_ring[i].base, -lp->tx_ring[i].length,
lp->tx_ring[i].misc);
printk ("\n");
}
#endif
lance_restart (dev, 0x0043, 1);
dev->trans_start = jiffies;
netif_wake_queue (dev);
}
static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct lance_private *lp = dev->priv;
int ioaddr = dev->base_addr;
int entry;
unsigned long flags;
spin_lock_irqsave(&lp->devlock, flags);
if (lance_debug > 3) {
outw(0x0000, ioaddr+LANCE_ADDR);
printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
inw(ioaddr+LANCE_DATA));
outw(0x0000, ioaddr+LANCE_DATA);
}
/* Fill in a Tx ring entry */
/* Mask to ring buffer boundary. */
entry = lp->cur_tx & TX_RING_MOD_MASK;
/* Caution: the write order is important here, set the base address
with the "ownership" bits last. */
/* The old LANCE chips doesn't automatically pad buffers to min. size. */
if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) {
if (skb->len < ETH_ZLEN) {
skb = skb_padto(skb, ETH_ZLEN);
if (skb == NULL)
goto out;
lp->tx_ring[entry].length = -ETH_ZLEN;
}
else
lp->tx_ring[entry].length = -skb->len;
} else
lp->tx_ring[entry].length = -skb->len;
lp->tx_ring[entry].misc = 0x0000;
lp->stats.tx_bytes += skb->len;
/* If any part of this buffer is >16M we must copy it to a low-memory
buffer. */
if ((u32)isa_virt_to_bus(skb->data) + skb->len > 0x01000000) {
if (lance_debug > 5)
printk("%s: bouncing a high-memory packet (%#x).\n",
dev->name, (u32)isa_virt_to_bus(skb->data));
memcpy(&lp->tx_bounce_buffs[entry], skb->data, skb->len);
lp->tx_ring[entry].base =
((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000;
dev_kfree_skb(skb);
} else {
lp->tx_skbuff[entry] = skb;
lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000;
}
lp->cur_tx++;
/* Trigger an immediate send poll. */
outw(0x0000, ioaddr+LANCE_ADDR);
outw(0x0048, ioaddr+LANCE_DATA);
dev->trans_start = jiffies;