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[mascara-docs.git] / i386 / linux-2.3.21 / drivers / net / sun3lance.c
blob4fff08b7fcd25608fd19d301df7966afe6a06af7
1 /* sun3lance.c: Ethernet driver for SUN3 Lance chip */
2 /*
3
4 Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net).
5 This driver is a part of the linux kernel, and is thus distributed
6 under the GNU Public License.
7
8 The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically
9 true for the correct IRQ and address of the lance registers. They
10 have not been widely tested, however. What we probably need is a
11 "proper" way to search for a device in the sun3's prom, but, alas,
12 linux has no such thing.
13
14 This driver is largely based on atarilance.c, by Roman Hodek. Other
15 sources of inspiration were the NetBSD sun3 am7990 driver, and the
16 linux sparc lance driver (sunlance.c).
17
18 There are more assumptions made throughout this driver, it almost
19 certainly still needs work, but it does work at least for RARP/BOOTP and
20 mounting the root NFS filesystem.
21
22 */
23
24 static char *version = "sun3lance.c: v1.0 12/12/96 Sam Creasey (sammy@users.qual.net)\n";
25
26 #include <linux/module.h>
27
28 #include <linux/stddef.h>
29 #include <linux/kernel.h>
30 #include <linux/sched.h>
31 #include <linux/string.h>
32 #include <linux/ptrace.h>
33 #include <linux/errno.h>
34 #include <linux/malloc.h>
35 #include <linux/interrupt.h>
36 #include <linux/init.h>
37
38 #include <asm/setup.h>
39 #include <asm/irq.h>
40
41 #include <asm/bitops.h>
42 #include <asm/io.h>
43 #include <asm/idprom.h>
44 #include <asm/pgtable.h>
45 #include <asm/sun3mmu.h>
46 #include <asm/dvma.h>
47
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51
52 /* sun3/60 addr/irq for the lance chip. If your sun is different,
53 change this. */
54 #define LANCE_OBIO 0x120000
55 #define LANCE_IRQ IRQ3
56
57 /* Debug level:
58 * 0 = silent, print only serious errors
59 * 1 = normal, print error messages
60 * 2 = debug, print debug infos
61 * 3 = debug, print even more debug infos (packet data)
62 */
63
64 #define LANCE_DEBUG 1
65
66 #ifdef LANCE_DEBUG
67 static int lance_debug = LANCE_DEBUG;
68 #else
69 static int lance_debug = 1;
70 #endif
71 MODULE_PARM(lance_debug, "i");
72
73 #define DPRINTK(n,a) \
74 do { \
75 if (lance_debug >= n) \
76 printk a; \
77 } while( 0 )
78
79
80 /* we're only using 32k of memory, so we use 4 TX
81 buffers and 16 RX buffers. These values are expressed as log2. */
82
83 #define TX_LOG_RING_SIZE 3
84 #define RX_LOG_RING_SIZE 5
85
86 /* These are the derived values */
87
88 #define TX_RING_SIZE (1 << TX_LOG_RING_SIZE)
89 #define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5)
90 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
91
92 #define RX_RING_SIZE (1 << RX_LOG_RING_SIZE)
93 #define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5)
94 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
95
96 /* Definitions for packet buffer access: */
97 #define PKT_BUF_SZ 1544
98
99 /* Get the address of a packet buffer corresponding to a given buffer head */
100 #define PKTBUF_ADDR(head) (void *)((unsigned long)(MEM) | (head)->base)
101
102
103 /* The LANCE Rx and Tx ring descriptors. */
104 struct lance_rx_head {
105 unsigned short base; /* Low word of base addr */
106 volatile unsigned char flag;
107 unsigned char base_hi; /* High word of base addr (unused) */
108 short buf_length; /* This length is 2s complement! */
109 volatile short msg_length; /* This length is "normal". */
110 };
111
112 struct lance_tx_head {
113 unsigned short base; /* Low word of base addr */
114 volatile unsigned char flag;
115 unsigned char base_hi; /* High word of base addr (unused) */
116 short length; /* Length is 2s complement! */
117 volatile short misc;
118 };
119
120 /* The LANCE initialization block, described in databook. */
121 struct lance_init_block {
122 unsigned short mode; /* Pre-set mode */
123 unsigned char hwaddr[6]; /* Physical ethernet address */
124 unsigned int filter[2]; /* Multicast filter (unused). */
125 /* Receive and transmit ring base, along with length bits. */
126 unsigned short rdra;
127 unsigned short rlen;
128 unsigned short tdra;
129 unsigned short tlen;
130 unsigned short pad[4]; /* is thie needed? */
131 };
132
133 /* The whole layout of the Lance shared memory */
134 struct lance_memory {
135 struct lance_init_block init;
136 struct lance_tx_head tx_head[TX_RING_SIZE];
137 struct lance_rx_head rx_head[RX_RING_SIZE];
138 char rx_data[RX_RING_SIZE][PKT_BUF_SZ];
139 char tx_data[RX_RING_SIZE][PKT_BUF_SZ];
140 };
141
142 /* The driver's private device structure */
143
144 struct lance_private {
145 volatile unsigned short *iobase;
146 struct lance_memory *mem;
147 int new_rx, new_tx; /* The next free ring entry */
148 int old_tx, old_rx; /* ring entry to be processed */
149 struct net_device_stats stats;
150 /* These two must be ints for set_bit() */
151 int tx_full;
152 int lock;
153 };
154
155 /* I/O register access macros */
156
157 #define MEM lp->mem
158 #define DREG lp->iobase[0]
159 #define AREG lp->iobase[1]
160 #define REGA(a) ( AREG = (a), DREG )
161
162 /* Definitions for the Lance */
163
164 /* tx_head flags */
165 #define TMD1_ENP 0x01 /* end of packet */
166 #define TMD1_STP 0x02 /* start of packet */
167 #define TMD1_DEF 0x04 /* deferred */
168 #define TMD1_ONE 0x08 /* one retry needed */
169 #define TMD1_MORE 0x10 /* more than one retry needed */
170 #define TMD1_ERR 0x40 /* error summary */
171 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */
172
173 #define TMD1_OWN_CHIP TMD1_OWN
174 #define TMD1_OWN_HOST 0
175
176 /* tx_head misc field */
177 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */
178 #define TMD3_RTRY 0x0400 /* failed after 16 retries */
179 #define TMD3_LCAR 0x0800 /* carrier lost */
180 #define TMD3_LCOL 0x1000 /* late collision */
181 #define TMD3_UFLO 0x4000 /* underflow (late memory) */
182 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */
183
184 /* rx_head flags */
185 #define RMD1_ENP 0x01 /* end of packet */
186 #define RMD1_STP 0x02 /* start of packet */
187 #define RMD1_BUFF 0x04 /* buffer error */
188 #define RMD1_CRC 0x08 /* CRC error */
189 #define RMD1_OFLO 0x10 /* overflow */
190 #define RMD1_FRAM 0x20 /* framing error */
191 #define RMD1_ERR 0x40 /* error summary */
192 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */
193
194 #define RMD1_OWN_CHIP RMD1_OWN
195 #define RMD1_OWN_HOST 0
196
197 /* register names */
198 #define CSR0 0 /* mode/status */
199 #define CSR1 1 /* init block addr (low) */
200 #define CSR2 2 /* init block addr (high) */
201 #define CSR3 3 /* misc */
202 #define CSR8 8 /* address filter */
203 #define CSR15 15 /* promiscuous mode */
204
205 /* CSR0 */
206 /* (R=readable, W=writeable, S=set on write, C=clear on write) */
207 #define CSR0_INIT 0x0001 /* initialize (RS) */
208 #define CSR0_STRT 0x0002 /* start (RS) */
209 #define CSR0_STOP 0x0004 /* stop (RS) */
210 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */
211 #define CSR0_TXON 0x0010 /* transmitter on (R) */
212 #define CSR0_RXON 0x0020 /* receiver on (R) */
213 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */
214 #define CSR0_INTR 0x0080 /* interrupt active (R) */
215 #define CSR0_IDON 0x0100 /* initialization done (RC) */
216 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */
217 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */
218 #define CSR0_MERR 0x0800 /* memory error (RC) */
219 #define CSR0_MISS 0x1000 /* missed frame (RC) */
220 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */
221 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */
222 #define CSR0_ERR 0x8000 /* error (RC) */
223
224 /* CSR3 */
225 #define CSR3_BCON 0x0001 /* byte control */
226 #define CSR3_ACON 0x0002 /* ALE control */
227 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */
228
229 /***************************** Prototypes *****************************/
230
231 static int lance_probe( struct net_device *dev);
232 static int lance_open( struct net_device *dev );
233 static void lance_init_ring( struct net_device *dev );
234 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
235 static void lance_interrupt( int irq, void *dev_id, struct pt_regs *fp );
236 static int lance_rx( struct net_device *dev );
237 static int lance_close( struct net_device *dev );
238 static struct net_device_stats *lance_get_stats( struct net_device *dev );
239 static void set_multicast_list( struct net_device *dev );
240
241 /************************* End of Prototypes **************************/
242
243 int __init sun3lance_probe( struct net_device *dev )
244 {
245 static int found = 0;
246
247 if(found)
248 return(ENODEV);
249
250 if (lance_probe(dev)) {
251 found = 1;
252 return( 0 );
253 }
254
255 return( ENODEV );
256 }
257
258 static int __init lance_probe( struct net_device *dev)
259 {
260 unsigned long ioaddr, iopte;
261
262 struct lance_private *lp;
263 int i;
264 static int did_version = 0;
265 int found = 0;
266
267 /* LANCE_OBIO can be found within the IO pmeg with some effort */
268 for(ioaddr = 0xfe00000; ioaddr < (0xfe00000 +
269 SUN3_PMEG_SIZE); ioaddr += SUN3_PTE_SIZE) {
270
271 iopte = sun3_get_pte(ioaddr);
272 if(!(iopte & SUN3_PAGE_TYPE_IO)) /* this an io page? */
273 continue;
274
275 if(((iopte & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT) ==
276 LANCE_OBIO) {
277 found = 1;
278 break;
279 }
280 }
281
282 if(!found)
283 return 0;
284
285 init_etherdev( dev, sizeof(struct lance_private) );
286 if (!dev->priv)
287 dev->priv = kmalloc( sizeof(struct lance_private), GFP_KERNEL );
288 lp = (struct lance_private *)dev->priv;
289 MEM = (struct lance_memory *)sun3_dvma_malloc(sizeof(struct
290 lance_memory));
291 lp->iobase = (volatile unsigned short *)ioaddr;
292 dev->base_addr = (unsigned long)ioaddr; /* informational only */
293
294 REGA(CSR0) = CSR0_STOP;
295
296 request_irq(LANCE_IRQ, lance_interrupt, 0, "SUN3 Lance", dev);
297 dev->irq = (unsigned short)LANCE_IRQ;
298
299
300 printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
301 dev->name,
302 (unsigned long)ioaddr,
303 (unsigned long)MEM,
304 dev->irq);
305
306 /* copy in the ethernet address from the prom */
307 for(i = 0; i < 6 ; i++)
308 dev->dev_addr[i] = idprom->id_ethaddr[i];
309
310 /* tell the card it's ether address, bytes swapped */
311 MEM->init.hwaddr[0] = dev->dev_addr[1];
312 MEM->init.hwaddr[1] = dev->dev_addr[0];
313 MEM->init.hwaddr[2] = dev->dev_addr[3];
314 MEM->init.hwaddr[3] = dev->dev_addr[2];
315 MEM->init.hwaddr[4] = dev->dev_addr[5];
316 MEM->init.hwaddr[5] = dev->dev_addr[4];
317
318 for( i = 0; i < 6; ++i )
319 printk( "%02x%s", dev->dev_addr[i], (i < 5) ? ":" : "\n" );
320
321 MEM->init.mode = 0x0000;
322 MEM->init.filter[0] = 0x00000000;
323 MEM->init.filter[1] = 0x00000000;
324 MEM->init.rdra = sun3_dvma_vtop(MEM->rx_head);
325 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) |
326 (sun3_dvma_vtop(MEM->rx_head) >> 16);
327 MEM->init.tdra = sun3_dvma_vtop(MEM->tx_head);
328 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) |
329 (sun3_dvma_vtop(MEM->tx_head) >> 16);
330
331 DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
332 sun3_dvma_vtop(&(MEM->init)), sun3_dvma_vtop(MEM->rx_head),
333 (sun3_dvma_vtop(MEM->tx_head))));
334
335
336 if (did_version++ == 0)
337 DPRINTK( 1, ( version ));
338
339 /* The LANCE-specific entries in the device structure. */
340 dev->open = &lance_open;
341 dev->hard_start_xmit = &lance_start_xmit;
342 dev->stop = &lance_close;
343 dev->get_stats = &lance_get_stats;
344 dev->set_multicast_list = &set_multicast_list;
345 dev->set_mac_address = 0;
346 dev->start = 0;
347
348 memset( &lp->stats, 0, sizeof(lp->stats) );
349
350 return 1;
351 }
352
353 static int lance_open( struct net_device *dev )
354 {
355 struct lance_private *lp = (struct lance_private *)dev->priv;
356 int i;
357
358 DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
359
360 REGA(CSR0) = CSR0_STOP;
361
362 /* tell the lance the address of its init block */
363 REGA(CSR1) = sun3_dvma_vtop(&(MEM->init));
364 REGA(CSR2) = sun3_dvma_vtop(&(MEM->init)) >> 16;
365
366 lance_init_ring(dev);
367
368 /* Re-initialize the LANCE, and start it when done. */
369
370 REGA(CSR3) = CSR3_BSWP;
371
372 /* From now on, AREG is kept to point to CSR0 */
373 REGA(CSR0) = CSR0_INIT;
374
375 i = 1000000;
376 while (--i > 0)
377 if (DREG & CSR0_IDON)
378 break;
379 if (i < 0 || (DREG & CSR0_ERR)) {
380 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
381 dev->name, i, DREG ));
382 DREG = CSR0_STOP;
383 return( -EIO );
384 }
385
386 DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
387
388 dev->tbusy = 0;
389 dev->interrupt = 0;
390 dev->start = 1;
391
392 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
393 MOD_INC_USE_COUNT;
394
395 return( 0 );
396 }
397
398
399 /* Initialize the LANCE Rx and Tx rings. */
400
401 static void lance_init_ring( struct net_device *dev )
402 {
403 struct lance_private *lp = (struct lance_private *)dev->priv;
404 int i;
405
406 lp->lock = 0;
407 lp->tx_full = 0;
408 lp->new_rx = lp->new_tx = 0;
409 lp->old_rx = lp->old_tx = 0;
410
411 for( i = 0; i < TX_RING_SIZE; i++ ) {
412 MEM->tx_head[i].base = sun3_dvma_vtop(MEM->tx_data[i]);
413 MEM->tx_head[i].flag = 0;
414 MEM->tx_head[i].base_hi =
415 (sun3_dvma_vtop(MEM->tx_data[i])) >>16;
416 MEM->tx_head[i].length = 0;
417 MEM->tx_head[i].misc = 0;
418 }
419
420 for( i = 0; i < RX_RING_SIZE; i++ ) {
421 MEM->rx_head[i].base = sun3_dvma_vtop(MEM->rx_data[i]);
422 MEM->rx_head[i].flag = TMD1_OWN_CHIP;
423 MEM->rx_head[i].base_hi =
424 (sun3_dvma_vtop(MEM->rx_data[i])) >> 16;
425 MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
426 MEM->rx_head[i].msg_length = 0;
427 }
428
429 }
430
431
432 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
433 {
434 struct lance_private *lp = (struct lance_private *)dev->priv;
435 int entry, len;
436 struct lance_tx_head *head;
437 unsigned long flags;
438
439 /* Transmitter timeout, serious problems. */
440 if (dev->tbusy) {
441 int tickssofar = jiffies - dev->trans_start;
442 if (tickssofar < 20)
443 return( 1 );
444
445 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
446 dev->name, DREG ));
447 DREG = CSR0_STOP;
448 /*
449 * Always set BSWP after a STOP as STOP puts it back into
450 * little endian mode.
451 */
452 REGA(CSR3) = CSR3_BSWP;
453 lp->stats.tx_errors++;
454
455 if(lance_debug >= 2) {
456 int i;
457 printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
458 lp->old_tx, lp->new_tx,
459 lp->tx_full ? " (full)" : "",
460 lp->new_rx );
461 for( i = 0 ; i < RX_RING_SIZE; i++ )
462 printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
463 i, MEM->rx_head[i].base,
464 -MEM->rx_head[i].buf_length,
465 MEM->rx_head[i].msg_length);
466 for( i = 0 ; i < TX_RING_SIZE; i++ )
467 printk("tx #%d: base=%04x len=%04x misc=%04x\n",
468 i, MEM->tx_head[i].base,
469 -MEM->tx_head[i].length,
470 MEM->tx_head[i].misc );
471 }
472
473 lance_init_ring(dev);
474 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
475
476 dev->tbusy = 0;
477 dev->trans_start = jiffies;
478
479 return 0;
480 }
481
482 AREG = CSR0;
483 // DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
484 // dev->name, DREG ));
485
486 /* Block a timer-based transmit from overlapping. This could better be
487 done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
488 if (test_and_set_bit( 0, (void*)&dev->tbusy ) != 0) {
489 printk("%s: Transmitter access conflict.\n", dev->name);
490 return 1;
491 }
492
493 if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
494 printk( "%s: tx queue lock!.\n", dev->name);
495 /* don't clear dev->tbusy flag. */
496 return 1;
497 }
498
499 /* Fill in a Tx ring entry */
500 #if 0
501 if (lance_debug >= 3) {
502 u_char *p;
503 int i;
504 printk( "%s: TX pkt %d type 0x%04x from ", dev->name,
505 lp->new_tx, ((u_short *)skb->data)[6]);
506 for( p = &((u_char *)skb->data)[6], i = 0; i < 6; i++ )
507 printk("%02x%s", *p++, i != 5 ? ":" : "" );
508 printk(" to ");
509 for( p = (u_char *)skb->data, i = 0; i < 6; i++ )
510 printk("%02x%s", *p++, i != 5 ? ":" : "" );
511 printk(" data at 0x%08x len %d\n", (int)skb->data,
512 (int)skb->len );
513 }
514 #endif
515 /* We're not prepared for the int until the last flags are set/reset.
516 * And the int may happen already after setting the OWN_CHIP... */
517 save_and_cli(flags);
518
519 /* Mask to ring buffer boundary. */
520 entry = lp->new_tx;
521 head = &(MEM->tx_head[entry]);
522
523 /* Caution: the write order is important here, set the "ownership" bits
524 * last.
525 */
526
527 /* the sun3's lance needs it's buffer padded to the minimum
528 size */
529 len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
530
531 // head->length = -len;
532 head->length = (-len) | 0xf000;
533 head->misc = 0;
534
535 memcpy( PKTBUF_ADDR(head), (void *)skb->data, skb->len );
536 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
537 lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
538 lp->stats.tx_bytes += skb->len;
539
540 /* Trigger an immediate send poll. */
541 REGA(CSR0) = CSR0_INEA | CSR0_TDMD;
542 dev->trans_start = jiffies;
543 dev_kfree_skb( skb );
544
545 lp->lock = 0;
546 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
547 TMD1_OWN_HOST)
548 dev->tbusy = 0;
549
550 restore_flags(flags);
551
552 return 0;
553 }
554
555 /* The LANCE interrupt handler. */
556
557 static void lance_interrupt( int irq, void *dev_id, struct pt_regs *fp)
558 {
559 struct net_device *dev = dev_id;
560 struct lance_private *lp = dev->priv;
561 int csr0;
562
563 if (dev == NULL) {
564 DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" ));
565 return;
566 }
567
568 if (dev->interrupt)
569 DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
570 dev->interrupt = 1;
571
572 still_more:
573
574 AREG = CSR0;
575 csr0 = DREG;
576
577 /* ack interrupts */
578 DREG = csr0 & (CSR0_TINT | CSR0_RINT);
579
580 /* clear errors */
581 if(csr0 & CSR0_ERR)
582 DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
583
584
585 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n",
586 dev->name, csr0, DREG ));
587
588 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */
589 int old_tx = lp->old_tx;
590
591 // if(lance_debug >= 3) {
592 // int i;
593 //
594 // printk("%s: tx int\n", dev->name);
595 //
596 // for(i = 0; i < TX_RING_SIZE; i++)
597 // printk("ring %d flag=%04x\n", i,
598 // MEM->tx_head[i].flag);
599 // }
600
601 while( old_tx != lp->new_tx) {
602 struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
603
604 DPRINTK(3, ("on tx_ring %d\n", old_tx));
605
606 if (head->flag & TMD1_OWN_CHIP)
607 break; /* It still hasn't been Txed */
608
609 if (head->flag & TMD1_ERR) {
610 int status = head->misc;
611 lp->stats.tx_errors++;
612 if (status & TMD3_RTRY) lp->stats.tx_aborted_errors++;
613 if (status & TMD3_LCAR) lp->stats.tx_carrier_errors++;
614 if (status & TMD3_LCOL) lp->stats.tx_window_errors++;
615 if (status & (TMD3_UFLO | TMD3_BUFF)) {
616 lp->stats.tx_fifo_errors++;
617 printk("%s: Tx FIFO error\n",
618 dev->name);
619 REGA(CSR0) = CSR0_STOP;
620 REGA(CSR3) = CSR3_BSWP;
621 lance_init_ring(dev);
622 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
623 return;
624 }
625 } else if(head->flag & (TMD1_ENP | TMD1_STP)) {
626
627 head->flag &= ~(TMD1_ENP | TMD1_STP);
628 if(head->flag & (TMD1_ONE | TMD1_MORE))
629 lp->stats.collisions++;
630
631 lp->stats.tx_packets++;
632 DPRINTK(3, ("cleared tx ring %d\n", old_tx));
633 }
634 old_tx = (old_tx +1) & TX_RING_MOD_MASK;
635 }
636
637 lp->old_tx = old_tx;
638 }
639
640
641 if (dev->tbusy) {
642 /* The ring is no longer full, clear tbusy. */
643 dev->tbusy = 0;
644 mark_bh( NET_BH );
645 }
646
647 if (csr0 & CSR0_RINT) /* Rx interrupt */
648 lance_rx( dev );
649
650 /* Log misc errors. */
651 if (csr0 & CSR0_BABL) lp->stats.tx_errors++; /* Tx babble. */
652 if (csr0 & CSR0_MISS) lp->stats.rx_errors++; /* Missed a Rx frame. */
653 if (csr0 & CSR0_MERR) {
654 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
655 "status %04x.\n", dev->name, csr0 ));
656 /* Restart the chip. */
657 REGA(CSR0) = CSR0_STOP;
658 REGA(CSR3) = CSR3_BSWP;
659 lance_init_ring(dev);
660 REGA(CSR0) = CSR0_STRT | CSR0_INEA;
661 }
662
663
664 /* Clear any other interrupt, and set interrupt enable. */
665 // DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
666 // CSR0_IDON | CSR0_INEA;
667
668 REGA(CSR0) = CSR0_INEA;
669
670 if(DREG & (CSR0_RINT | CSR0_TINT)) {
671 DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
672 goto still_more;
673 }
674
675 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
676 dev->name, DREG ));
677 dev->interrupt = 0;
678 return;
679 }
680
681 /* get packet, toss into skbuff */
682 static int lance_rx( struct net_device *dev )
683 {
684 struct lance_private *lp = (struct lance_private *)dev->priv;
685 int entry = lp->new_rx;
686
687 /* If we own the next entry, it's a new packet. Send it up. */
688 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
689 struct lance_rx_head *head = &(MEM->rx_head[entry]);
690 int status = head->flag;
691
692 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */
693 /* There is a tricky error noted by John Murphy,
694 <murf@perftech.com> to Russ Nelson: Even with
695 full-sized buffers it's possible for a jabber packet to use two
696 buffers, with only the last correctly noting the error. */
697 if (status & RMD1_ENP) /* Only count a general error at the */
698 lp->stats.rx_errors++; /* end of a packet.*/
699 if (status & RMD1_FRAM) lp->stats.rx_frame_errors++;
700 if (status & RMD1_OFLO) lp->stats.rx_over_errors++;
701 if (status & RMD1_CRC) lp->stats.rx_crc_errors++;
702 if (status & RMD1_BUFF) lp->stats.rx_fifo_errors++;
703 head->flag &= (RMD1_ENP|RMD1_STP);
704 } else {
705 /* Malloc up new buffer, compatible with net-3. */
706 // short pkt_len = head->msg_length;// & 0xfff;
707 short pkt_len = (head->msg_length & 0xfff) - 4;
708 struct sk_buff *skb;
709
710 if (pkt_len < 60) {
711 printk( "%s: Runt packet!\n", dev->name );
712 lp->stats.rx_errors++;
713 }
714 else {
715 skb = dev_alloc_skb( pkt_len+2 );
716 if (skb == NULL) {
717 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n",
718 dev->name ));
719
720 lp->stats.rx_dropped++;
721 head->msg_length = 0;
722 head->flag |= RMD1_OWN_CHIP;
723 lp->new_rx = (lp->new_rx+1) &
724 RX_RING_MOD_MASK;
725 }
726
727 #if 0
728 if (lance_debug >= 3) {
729 u_char *data = PKTBUF_ADDR(head), *p;
730 printk( "%s: RX pkt %d type 0x%04x from ", dev->name, entry, ((u_short *)data)[6]);
731 for( p = &data[6], i = 0; i < 6; i++ )
732 printk("%02x%s", *p++, i != 5 ? ":" : "" );
733 printk(" to ");
734 for( p = data, i = 0; i < 6; i++ )
735 printk("%02x%s", *p++, i != 5 ? ":" : "" );
736 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
737 "len %d at %08x\n",
738 data[15], data[16], data[17], data[18],
739 data[19], data[20], data[21], data[22],
740 pkt_len, data);
741 }
742 #endif
743 if (lance_debug >= 3) {
744 u_char *data = PKTBUF_ADDR(head);
745 printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
746 }
747
748
749 skb->dev = dev;
750 skb_reserve( skb, 2 ); /* 16 byte align */
751 skb_put( skb, pkt_len ); /* Make room */
752 // memcpy( skb->data, PKTBUF_ADDR(head), pkt_len );
753 eth_copy_and_sum(skb,
754 PKTBUF_ADDR(head),
755 pkt_len, 0);
756
757 skb->protocol = eth_type_trans( skb, dev );
758 netif_rx( skb );
759 lp->stats.rx_packets++;
760 lp->stats.rx_bytes += skb->len;
761 }
762 }
763
764 // head->buf_length = -PKT_BUF_SZ | 0xf000;
765 head->msg_length = 0;
766 head->flag = RMD1_OWN_CHIP;
767
768 entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
769 }
770
771 /* From lance.c (Donald Becker): */
772 /* We should check that at least two ring entries are free.
773 If not, we should free one and mark stats->rx_dropped++. */
774
775 return 0;
776 }
777
778
779 static int lance_close( struct net_device *dev )
780 {
781 struct lance_private *lp = (struct lance_private *)dev->priv;
782
783 dev->start = 0;
784 dev->tbusy = 1;
785
786 AREG = CSR0;
787
788 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
789 dev->name, DREG ));
790
791 /* We stop the LANCE here -- it occasionally polls
792 memory if we don't. */
793 DREG = CSR0_STOP;
794
795 MOD_DEC_USE_COUNT;
796 return 0;
797 }
798
799
800 static struct net_device_stats *lance_get_stats( struct net_device *dev )
801 {
802 struct lance_private *lp = (struct lance_private *)dev->priv;
803
804 return &lp->stats;
805 }
806
807
808 /* Set or clear the multicast filter for this adaptor.
809 num_addrs == -1 Promiscuous mode, receive all packets
810 num_addrs == 0 Normal mode, clear multicast list
811 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
812 best-effort filtering.
813 */
814
815 /* completely untested on a sun3 */
816 static void set_multicast_list( struct net_device *dev )
817 {
818 struct lance_private *lp = (struct lance_private *)dev->priv;
819
820 if (!dev->start)
821 /* Only possible if board is already started */
822 return;
823
824 /* We take the simple way out and always enable promiscuous mode. */
825 DREG = CSR0_STOP; /* Temporarily stop the lance. */
826
827 if (dev->flags & IFF_PROMISC) {
828 /* Log any net taps. */
829 DPRINTK( 1, ( "%s: Promiscuous mode enabled.\n", dev->name ));
830 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
831 } else {
832 short multicast_table[4];
833 int num_addrs = dev->mc_count;
834 int i;
835 /* We don't use the multicast table, but rely on upper-layer
836 * filtering. */
837 memset( multicast_table, (num_addrs == 0) ? 0 : -1,
838 sizeof(multicast_table) );
839 for( i = 0; i < 4; i++ )
840 REGA( CSR8+i ) = multicast_table[i];
841 REGA( CSR15 ) = 0; /* Unset promiscuous mode */
842 }
843
844 /*
845 * Always set BSWP after a STOP as STOP puts it back into
846 * little endian mode.
847 */
848 REGA( CSR3 ) = CSR3_BSWP;
849
850 /* Resume normal operation and reset AREG to CSR0 */
851 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
852 }
853
854
855 #ifdef MODULE
856 static char devicename[9] = { 0, };
857
858 static struct net_device sun3lance_dev =
859 {
860 devicename, /* filled in by register_netdev() */
861 0, 0, 0, 0, /* memory */
862 0, 0, /* base, irq */
863 0, 0, 0, NULL, sun3lance_probe,
864 };
865
866 int init_module(void)
867 {
868 int err;
869
870 if ((err = register_netdev( &sun3lance_dev ))) {
871 if (err == -EIO) {
872 printk( "SUN3 Lance not detected. Module not loaded.\n");
873 }
874 return( err );
875 }
876 return( 0 );
877 }
878
879 void cleanup_module(void)
880 {
881 unregister_netdev( &sun3lance_dev );
882 }
883
884 #endif /* MODULE */
885