File: /usr/src/linux/drivers/net/ariadne.c
1 /*
2 * Amiga Linux/m68k Ariadne Ethernet Driver
3 *
4 * © Copyright 1995 by Geert Uytterhoeven (geert@linux-m68k.org)
5 * Peter De Schrijver
6 * (Peter.DeSchrijver@linux.cc.kuleuven.ac.be)
7 *
8 * ---------------------------------------------------------------------------
9 *
10 * This program is based on
11 *
12 * lance.c: An AMD LANCE ethernet driver for linux.
13 * Written 1993-94 by Donald Becker.
14 *
15 * Am79C960: PCnet(tm)-ISA Single-Chip Ethernet Controller
16 * Advanced Micro Devices
17 * Publication #16907, Rev. B, Amendment/0, May 1994
18 *
19 * MC68230: Parallel Interface/Timer (PI/T)
20 * Motorola Semiconductors, December, 1983
21 *
22 * ---------------------------------------------------------------------------
23 *
24 * This file is subject to the terms and conditions of the GNU General Public
25 * License. See the file COPYING in the main directory of the Linux
26 * distribution for more details.
27 *
28 * ---------------------------------------------------------------------------
29 *
30 * The Ariadne is a Zorro-II board made by Village Tronic. It contains:
31 *
32 * - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
33 * 10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
34 *
35 * - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
36 */
37
38 #include <linux/module.h>
39 #include <linux/stddef.h>
40 #include <linux/kernel.h>
41 #include <linux/sched.h>
42 #include <linux/string.h>
43 #include <linux/ptrace.h>
44 #include <linux/errno.h>
45 #include <linux/ioport.h>
46 #include <linux/slab.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/interrupt.h>
50 #include <linux/skbuff.h>
51 #include <linux/init.h>
52
53 #include <asm/bitops.h>
54 #include <asm/amigaints.h>
55 #include <asm/amigahw.h>
56 #include <linux/zorro.h>
57 #include <asm/io.h>
58 #include <asm/irq.h>
59
60 #include "ariadne.h"
61
62
63 #ifdef ARIADNE_DEBUG
64 int ariadne_debug = ARIADNE_DEBUG;
65 #else
66 int ariadne_debug = 1;
67 #endif
68
69
70 /*
71 * Macros to Fix Endianness problems
72 */
73
74 /* Swap the Bytes in a WORD */
75 #define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00))
76 /* Get the Low BYTE in a WORD */
77 #define lowb(x) (x&0xff)
78 /* Get the Swapped High WORD in a LONG */
79 #define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
80 /* Get the Swapped Low WORD in a LONG */
81 #define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
82
83
84 /*
85 * Transmit/Receive Ring Definitions
86 */
87
88 #define TX_RING_SIZE 5
89 #define RX_RING_SIZE 16
90
91 #define PKT_BUF_SIZE 1520
92
93
94 /*
95 * Private Device Data
96 */
97
98 struct ariadne_private {
99 volatile struct TDRE *tx_ring[TX_RING_SIZE];
100 volatile struct RDRE *rx_ring[RX_RING_SIZE];
101 volatile u_short *tx_buff[TX_RING_SIZE];
102 volatile u_short *rx_buff[RX_RING_SIZE];
103 int cur_tx, cur_rx; /* The next free ring entry */
104 int dirty_tx; /* The ring entries to be free()ed. */
105 struct net_device_stats stats;
106 char tx_full;
107 struct net_device *dev; /* Backpointer */
108 struct ariadne_private *next_module;
109 };
110
111
112 /*
113 * Structure Created in the Ariadne's RAM Buffer
114 */
115
116 struct lancedata {
117 struct TDRE tx_ring[TX_RING_SIZE];
118 struct RDRE rx_ring[RX_RING_SIZE];
119 u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
120 u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
121 };
122
123 #ifdef MODULE
124 static struct ariadne_private *root_ariadne_dev;
125 #endif
126
127 static int ariadne_open(struct net_device *dev);
128 static void ariadne_init_ring(struct net_device *dev);
129 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
130 static void ariadne_tx_timeout(struct net_device *dev);
131 static int ariadne_rx(struct net_device *dev);
132 static void ariadne_reset(struct net_device *dev);
133 static void ariadne_interrupt(int irq, void *data, struct pt_regs *fp);
134 static int ariadne_close(struct net_device *dev);
135 static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
136 #ifdef HAVE_MULTICAST
137 static void set_multicast_list(struct net_device *dev);
138 #endif
139
140
141 static void memcpyw(volatile u_short *dest, u_short *src, int len)
142 {
143 while (len >= 2) {
144 *(dest++) = *(src++);
145 len -= 2;
146 }
147 if (len == 1)
148 *dest = (*(u_char *)src)<<8;
149 }
150
151
152 static int __init ariadne_probe(void)
153 {
154 struct zorro_dev *z = NULL;
155 struct net_device *dev;
156 struct ariadne_private *priv;
157 int res = -ENODEV;
158
159 while ((z = zorro_find_device(ZORRO_PROD_VILLAGE_TRONIC_ARIADNE, z))) {
160 unsigned long board = z->resource.start;
161 unsigned long base_addr = board+ARIADNE_LANCE;
162 unsigned long mem_start = board+ARIADNE_RAM;
163 struct resource *r1, *r2;
164
165 r1 = request_mem_region(base_addr, sizeof(struct Am79C960),
166 "Am79C960");
167 if (!r1) continue;
168 r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
169 if (!r2) {
170 release_resource(r1);
171 continue;
172 }
173
174 dev = init_etherdev(NULL, sizeof(struct ariadne_private));
175
176 if (dev == NULL) {
177 release_resource(r1);
178 release_resource(r2);
179 return -ENOMEM;
180 }
181 SET_MODULE_OWNER(dev);
182 priv = dev->priv;
183
184 r1->name = dev->name;
185 r2->name = dev->name;
186
187 priv->dev = dev;
188 dev->dev_addr[0] = 0x00;
189 dev->dev_addr[1] = 0x60;
190 dev->dev_addr[2] = 0x30;
191 dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
192 dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
193 dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
194 printk("%s: Ariadne at 0x%08lx, Ethernet Address "
195 "%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
196 dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
197 dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
198
199 dev->base_addr = ZTWO_VADDR(base_addr);
200 dev->mem_start = ZTWO_VADDR(mem_start);
201 dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
202
203 dev->open = &ariadne_open;
204 dev->stop = &ariadne_close;
205 dev->hard_start_xmit = &ariadne_start_xmit;
206 dev->tx_timeout = &ariadne_tx_timeout;
207 dev->watchdog_timeo = 5*HZ;
208 dev->get_stats = &ariadne_get_stats;
209 dev->set_multicast_list = &set_multicast_list;
210
211 #ifdef MODULE
212 priv->next_module = root_ariadne_dev;
213 root_ariadne_dev = priv;
214 #endif
215 res = 0;
216 }
217 return res;
218 }
219
220
221 static int ariadne_open(struct net_device *dev)
222 {
223 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
224 u_short in;
225 u_long version;
226 int i;
227
228 /* Reset the LANCE */
229 in = lance->Reset;
230
231 /* Stop the LANCE */
232 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
233 lance->RDP = STOP;
234
235 /* Check the LANCE version */
236 lance->RAP = CSR88; /* Chip ID */
237 version = swapw(lance->RDP);
238 lance->RAP = CSR89; /* Chip ID */
239 version |= swapw(lance->RDP)<<16;
240 if ((version & 0x00000fff) != 0x00000003) {
241 printk("ariadne_open: Couldn't find AMD Ethernet Chip\n");
242 return -EAGAIN;
243 }
244 if ((version & 0x0ffff000) != 0x00003000) {
245 printk("ariadne_open: Couldn't find Am79C960 (Wrong part number = %ld)\n",
246 (version & 0x0ffff000)>>12);
247 return -EAGAIN;
248 }
249 #if 0
250 printk("ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
251 (version & 0xf0000000)>>28);
252 #endif
253
254 ariadne_init_ring(dev);
255
256 /* Miscellaneous Stuff */
257 lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
258 lance->RDP = 0x0000;
259 lance->RAP = CSR4; /* Test and Features Control */
260 lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
261
262 /* Set the Multicast Table */
263 lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
264 lance->RDP = 0x0000;
265 lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
266 lance->RDP = 0x0000;
267 lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
268 lance->RDP = 0x0000;
269 lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
270 lance->RDP = 0x0000;
271
272 /* Set the Ethernet Hardware Address */
273 lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
274 lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
275 lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
276 lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
277 lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
278 lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
279
280 /* Set the Init Block Mode */
281 lance->RAP = CSR15; /* Mode Register */
282 lance->RDP = 0x0000;
283
284 /* Set the Transmit Descriptor Ring Pointer */
285 lance->RAP = CSR30; /* Base Address of Transmit Ring */
286 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
287 lance->RAP = CSR31; /* Base Address of transmit Ring */
288 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
289
290 /* Set the Receive Descriptor Ring Pointer */
291 lance->RAP = CSR24; /* Base Address of Receive Ring */
292 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
293 lance->RAP = CSR25; /* Base Address of Receive Ring */
294 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
295
296 /* Set the Number of RX and TX Ring Entries */
297 lance->RAP = CSR76; /* Receive Ring Length */
298 lance->RDP = swapw(((u_short)-RX_RING_SIZE));
299 lance->RAP = CSR78; /* Transmit Ring Length */
300 lance->RDP = swapw(((u_short)-TX_RING_SIZE));
301
302 /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
303 lance->RAP = ISACSR2; /* Miscellaneous Configuration */
304 lance->IDP = ASEL;
305
306 /* LED Control */
307 lance->RAP = ISACSR5; /* LED1 Status */
308 lance->IDP = PSE|XMTE;
309 lance->RAP = ISACSR6; /* LED2 Status */
310 lance->IDP = PSE|COLE;
311 lance->RAP = ISACSR7; /* LED3 Status */
312 lance->IDP = PSE|RCVE;
313
314 netif_start_queue(dev);
315
316 i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, SA_SHIRQ,
317 dev->name, dev);
318 if (i) return i;
319
320 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
321 lance->RDP = INEA|STRT;
322
323 return 0;
324 }
325
326
327 static void ariadne_init_ring(struct net_device *dev)
328 {
329 struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
330 volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
331 int i;
332
333 netif_stop_queue(dev);
334
335 priv->tx_full = 0;
336 priv->cur_rx = priv->cur_tx = 0;
337 priv->dirty_tx = 0;
338
339 /* Set up TX Ring */
340 for (i = 0; i < TX_RING_SIZE; i++) {
341 volatile struct TDRE *t = &lancedata->tx_ring[i];
342 t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
343 t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
344 TF_STP | TF_ENP;
345 t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
346 t->TMD3 = 0;
347 priv->tx_ring[i] = &lancedata->tx_ring[i];
348 priv->tx_buff[i] = lancedata->tx_buff[i];
349 #if 0
350 printk("TX Entry %2d at %p, Buf at %p\n", i, &lancedata->tx_ring[i],
351 lancedata->tx_buff[i]);
352 #endif
353 }
354
355 /* Set up RX Ring */
356 for (i = 0; i < RX_RING_SIZE; i++) {
357 volatile struct RDRE *r = &lancedata->rx_ring[i];
358 r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
359 r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
360 RF_OWN;
361 r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
362 r->RMD3 = 0x0000;
363 priv->rx_ring[i] = &lancedata->rx_ring[i];
364 priv->rx_buff[i] = lancedata->rx_buff[i];
365 #if 0
366 printk("RX Entry %2d at %p, Buf at %p\n", i, &lancedata->rx_ring[i],
367 lancedata->rx_buff[i]);
368 #endif
369 }
370 }
371
372
373 static int ariadne_close(struct net_device *dev)
374 {
375 struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
376 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
377
378 netif_stop_queue(dev);
379
380 lance->RAP = CSR112; /* Missed Frame Count */
381 priv->stats.rx_missed_errors = swapw(lance->RDP);
382 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
383
384 if (ariadne_debug > 1) {
385 printk("%s: Shutting down ethercard, status was %2.2x.\n", dev->name,
386 lance->RDP);
387 printk("%s: %lu packets missed\n", dev->name,
388 priv->stats.rx_missed_errors);
389 }
390
391 /* We stop the LANCE here -- it occasionally polls memory if we don't. */
392 lance->RDP = STOP;
393
394 free_irq(IRQ_AMIGA_PORTS, dev);
395
396 return 0;
397 }
398
399
400 static inline void ariadne_reset(struct net_device *dev)
401 {
402 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
403
404 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
405 lance->RDP = STOP;
406 ariadne_init_ring(dev);
407 lance->RDP = INEA|STRT;
408 netif_start_queue(dev);
409 }
410
411
412 static void ariadne_interrupt(int irq, void *data, struct pt_regs *fp)
413 {
414 struct net_device *dev = (struct net_device *)data;
415 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
416 struct ariadne_private *priv;
417 int csr0, boguscnt;
418
419 if (dev == NULL) {
420 printk("ariadne_interrupt(): irq for unknown device.\n");
421 return;
422 }
423
424 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
425
426 if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
427 return; /* generated by the board. */
428
429 priv = (struct ariadne_private *)dev->priv;
430
431 boguscnt = 10;
432 while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
433 /* Acknowledge all of the current interrupt sources ASAP. */
434 lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
435
436 #if 0
437 if (ariadne_debug > 5) {
438 printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.", dev->name,
439 csr0, lance->RDP);
440 printk("[");
441 if (csr0 & INTR)
442 printk(" INTR");
443 if (csr0 & INEA)
444 printk(" INEA");
445 if (csr0 & RXON)
446 printk(" RXON");
447 if (csr0 & TXON)
448 printk(" TXON");
449 if (csr0 & TDMD)
450 printk(" TDMD");
451 if (csr0 & STOP)
452 printk(" STOP");
453 if (csr0 & STRT)
454 printk(" STRT");
455 if (csr0 & INIT)
456 printk(" INIT");
457 if (csr0 & ERR)
458 printk(" ERR");
459 if (csr0 & BABL)
460 printk(" BABL");
461 if (csr0 & CERR)
462 printk(" CERR");
463 if (csr0 & MISS)
464 printk(" MISS");
465 if (csr0 & MERR)
466 printk(" MERR");
467 if (csr0 & RINT)
468 printk(" RINT");
469 if (csr0 & TINT)
470 printk(" TINT");
471 if (csr0 & IDON)
472 printk(" IDON");
473 printk(" ]\n");
474 }
475 #endif
476
477 if (csr0 & RINT) /* Rx interrupt */
478 ariadne_rx(dev);
479
480 if (csr0 & TINT) { /* Tx-done interrupt */
481 int dirty_tx = priv->dirty_tx;
482
483 while (dirty_tx < priv->cur_tx) {
484 int entry = dirty_tx % TX_RING_SIZE;
485 int status = lowb(priv->tx_ring[entry]->TMD1);
486
487 if (status & TF_OWN)
488 break; /* It still hasn't been Txed */
489
490 priv->tx_ring[entry]->TMD1 &= 0xff00;
491
492 if (status & TF_ERR) {
493 /* There was an major error, log it. */
494 int err_status = priv->tx_ring[entry]->TMD3;
495 priv->stats.tx_errors++;
496 if (err_status & EF_RTRY)
497 priv->stats.tx_aborted_errors++;
498 if (err_status & EF_LCAR)
499 priv->stats.tx_carrier_errors++;
500 if (err_status & EF_LCOL)
501 priv->stats.tx_window_errors++;
502 if (err_status & EF_UFLO) {
503 /* Ackk! On FIFO errors the Tx unit is turned off! */
504 priv->stats.tx_fifo_errors++;
505 /* Remove this verbosity later! */
506 printk("%s: Tx FIFO error! Status %4.4x.\n", dev->name,
507 csr0);
508 /* Restart the chip. */
509 lance->RDP = STRT;
510 }
511 } else {
512 if (status & (TF_MORE|TF_ONE))
513 priv->stats.collisions++;
514 priv->stats.tx_packets++;
515 }
516 dirty_tx++;
517 }
518
519 #ifndef final_version
520 if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
521 printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
522 dirty_tx, priv->cur_tx, priv->tx_full);
523 dirty_tx += TX_RING_SIZE;
524 }
525 #endif
526
527 if (priv->tx_full && netif_queue_stopped(dev) &&
528 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
529 /* The ring is no longer full. */
530 priv->tx_full = 0;
531 netif_wake_queue(dev);
532 }
533
534 priv->dirty_tx = dirty_tx;
535 }
536
537 /* Log misc errors. */
538 if (csr0 & BABL)
539 priv->stats.tx_errors++; /* Tx babble. */
540 if (csr0 & MISS)
541 priv->stats.rx_errors++; /* Missed a Rx frame. */
542 if (csr0 & MERR) {
543 printk("%s: Bus master arbitration failure, status %4.4x.\n",
544 dev->name, csr0);
545 /* Restart the chip. */
546 lance->RDP = STRT;
547 }
548 }
549
550 /* Clear any other interrupt, and set interrupt enable. */
551 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
552 lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
553
554 #if 0
555 if (ariadne_debug > 4)
556 printk("%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name, lance->RAP,
557 lance->RDP);
558 #endif
559 return;
560 }
561
562
563 static void ariadne_tx_timeout(struct net_device *dev)
564 {
565 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
566
567 printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
568 dev->name, lance->RDP);
569 ariadne_reset(dev);
570 netif_wake_queue(dev);
571 }
572
573
574 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
575 {
576 struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
577 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
578 int entry;
579 unsigned long flags;
580
581 #if 0
582 if (ariadne_debug > 3) {
583 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
584 printk("%s: ariadne_start_xmit() called, csr0 %4.4x.\n", dev->name,
585 lance->RDP);
586 lance->RDP = 0x0000;
587 }
588 #endif
589
590 /* Fill in a Tx ring entry */
591
592 #if 0
593 printk("TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
594 {
595 int i;
596 u_char *ptr = &((u_char *)skb->data)[6];
597 for (i = 0; i < 6; i++)
598 printk("%02x", ptr[i]);
599 }
600 printk(" to ");
601 {
602 int i;
603 u_char *ptr = (u_char *)skb->data;
604 for (i = 0; i < 6; i++)
605 printk("%02x", ptr[i]);
606 }
607 printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
608 #endif
609
610 save_flags(flags);
611 cli();
612
613 entry = priv->cur_tx % TX_RING_SIZE;
614
615 /* Caution: the write order is important here, set the base address with
616 the "ownership" bits last. */
617
618 priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
619 priv->tx_ring[entry]->TMD3 = 0x0000;
620 memcpyw(priv->tx_buff[entry], (u_short *)skb->data,
621 skb->len <= ETH_ZLEN ? ETH_ZLEN : skb->len);
622
623 #if 0
624 {
625 int i, len;
626
627 len = skb->len > 64 ? 64 : skb->len;
628 len >>= 1;
629 for (i = 0; i < len; i += 8) {
630 int j;
631 printk("%04x:", i);
632 for (j = 0; (j < 8) && ((i+j) < len); j++) {
633 if (!(j & 1))
634 printk(" ");
635 printk("%04x", priv->tx_buff[entry][i+j]);
636 }
637 printk("\n");
638 }
639 }
640 #endif
641
642 priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
643
644 dev_kfree_skb(skb);
645
646 priv->cur_tx++;
647 if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
648
649 #if 0
650 printk("*** Subtracting TX_RING_SIZE from cur_tx (%d) and dirty_tx (%d)\n",
651 priv->cur_tx, priv->dirty_tx);
652 #endif
653
654 priv->cur_tx -= TX_RING_SIZE;
655 priv->dirty_tx -= TX_RING_SIZE;
656 }
657
658 /* Trigger an immediate send poll. */
659 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
660 lance->RDP = INEA|TDMD;
661
662 dev->trans_start = jiffies;
663
664 if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
665 netif_stop_queue(dev);
666 priv->tx_full = 1;
667 }
668 restore_flags(flags);
669
670 return 0;
671 }
672
673
674 static int ariadne_rx(struct net_device *dev)
675 {
676 struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
677 int entry = priv->cur_rx % RX_RING_SIZE;
678 int i;
679
680 /* If we own the next entry, it's a new packet. Send it up. */
681 while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
682 int status = lowb(priv->rx_ring[entry]->RMD1);
683
684 if (status != (RF_STP|RF_ENP)) { /* There was an error. */
685 /* There is a tricky error noted by John Murphy,
686 <murf@perftech.com> to Russ Nelson: Even with full-sized
687 buffers it's possible for a jabber packet to use two
688 buffers, with only the last correctly noting the error. */
689 if (status & RF_ENP)
690 /* Only count a general error at the end of a packet.*/
691 priv->stats.rx_errors++;
692 if (status & RF_FRAM)
693 priv->stats.rx_frame_errors++;
694 if (status & RF_OFLO)
695 priv->stats.rx_over_errors++;
696 if (status & RF_CRC)
697 priv->stats.rx_crc_errors++;
698 if (status & RF_BUFF)
699 priv->stats.rx_fifo_errors++;
700 priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
701 } else {
702 /* Malloc up new buffer, compatible with net-3. */
703 short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
704 struct sk_buff *skb;
705
706 skb = dev_alloc_skb(pkt_len+2);
707 if (skb == NULL) {
708 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
709 for (i = 0; i < RX_RING_SIZE; i++)
710 if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
711 break;
712
713 if (i > RX_RING_SIZE-2) {
714 priv->stats.rx_dropped++;
715 priv->rx_ring[entry]->RMD1 |= RF_OWN;
716 priv->cur_rx++;
717 }
718 break;
719 }
720
721
722 skb->dev = dev;
723 skb_reserve(skb,2); /* 16 byte align */
724 skb_put(skb,pkt_len); /* Make room */
725 eth_copy_and_sum(skb, (char *)priv->rx_buff[entry], pkt_len,0);
726 skb->protocol=eth_type_trans(skb,dev);
727 #if 0
728 printk("RX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
729 {
730 int i;
731 u_char *ptr = &((u_char *)skb->data)[6];
732 for (i = 0; i < 6; i++)
733 printk("%02x", ptr[i]);
734 }
735 printk(" to ");
736 {
737 int i;
738 u_char *ptr = (u_char *)skb->data;
739 for (i = 0; i < 6; i++)
740 printk("%02x", ptr[i]);
741 }
742 printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
743 #endif
744
745 netif_rx(skb);
746 dev->last_rx = jiffies;
747 priv->stats.rx_packets++;
748 priv->stats.rx_bytes += pkt_len;
749 }
750
751 priv->rx_ring[entry]->RMD1 |= RF_OWN;
752 entry = (++priv->cur_rx) % RX_RING_SIZE;
753 }
754
755 priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
756
757 /* We should check that at least two ring entries are free. If not,
758 we should free one and mark stats->rx_dropped++. */
759
760 return 0;
761 }
762
763
764 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
765 {
766 struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
767 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
768 short saved_addr;
769 unsigned long flags;
770
771 save_flags(flags);
772 cli();
773 saved_addr = lance->RAP;
774 lance->RAP = CSR112; /* Missed Frame Count */
775 priv->stats.rx_missed_errors = swapw(lance->RDP);
776 lance->RAP = saved_addr;
777 restore_flags(flags);
778
779 return &priv->stats;
780 }
781
782
783 /* Set or clear the multicast filter for this adaptor.
784 num_addrs == -1 Promiscuous mode, receive all packets
785 num_addrs == 0 Normal mode, clear multicast list
786 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
787 best-effort filtering.
788 */
789 static void set_multicast_list(struct net_device *dev)
790 {
791 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
792
793 if (!netif_running(dev))
794 return;
795
796 netif_stop_queue(dev);
797
798 /* We take the simple way out and always enable promiscuous mode. */
799 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
800 lance->RDP = STOP; /* Temporarily stop the lance. */
801 ariadne_init_ring(dev);
802
803 if (dev->flags & IFF_PROMISC) {
804 /* Log any net taps. */
805 printk("%s: Promiscuous mode enabled.\n", dev->name);
806 lance->RAP = CSR15; /* Mode Register */
807 lance->RDP = PROM; /* Set promiscuous mode */
808 } else {
809 short multicast_table[4];
810 int num_addrs = dev->mc_count;
811 int i;
812 /* We don't use the multicast table, but rely on upper-layer filtering. */
813 memset(multicast_table, (num_addrs == 0) ? 0 : -1,
814 sizeof(multicast_table));
815 for (i = 0; i < 4; i++) {
816 lance->RAP = CSR8+(i<<8); /* Logical Address Filter */
817 lance->RDP = swapw(multicast_table[i]);
818 }
819 lance->RAP = CSR15; /* Mode Register */
820 lance->RDP = 0x0000; /* Unset promiscuous mode */
821 }
822
823 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
824 lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */
825
826 netif_wake_queue(dev);
827 }
828
829
830 static void __exit ariadne_cleanup(void)
831 {
832 #ifdef MODULE
833 struct ariadne_private *next;
834 struct net_device *dev;
835
836 while (root_ariadne_dev) {
837 next = root_ariadne_dev->next_module;
838 dev = root_ariadne_dev->dev;
839 unregister_netdev(dev);
840 release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
841 release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
842 kfree(dev);
843 root_ariadne_dev = next;
844 }
845 #endif
846 }
847
848 module_init(ariadne_probe);
849 module_exit(ariadne_cleanup);
850