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rcv reorder queue bugfix
[cor_2_6_31.git] / drivers / net / ariadne.c
blob58e8d522e5bcadbde4c9dc540298ace5b392ddae
1 /*
2 * Amiga Linux/m68k Ariadne Ethernet Driver
3 *
4 * © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
5 * Peter De Schrijver (p2@mind.be)
6 *
7 * ---------------------------------------------------------------------------
8 *
9 * This program is based on
10 *
11 * lance.c: An AMD LANCE ethernet driver for linux.
12 * Written 1993-94 by Donald Becker.
13 *
14 * Am79C960: PCnet(tm)-ISA Single-Chip Ethernet Controller
15 * Advanced Micro Devices
16 * Publication #16907, Rev. B, Amendment/0, May 1994
17 *
18 * MC68230: Parallel Interface/Timer (PI/T)
19 * Motorola Semiconductors, December, 1983
20 *
21 * ---------------------------------------------------------------------------
22 *
23 * This file is subject to the terms and conditions of the GNU General Public
24 * License. See the file COPYING in the main directory of the Linux
25 * distribution for more details.
26 *
27 * ---------------------------------------------------------------------------
28 *
29 * The Ariadne is a Zorro-II board made by Village Tronic. It contains:
30 *
31 * - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
32 * 10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
33 *
34 * - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
35 */
36
37 #include <linux/module.h>
38 #include <linux/stddef.h>
39 #include <linux/kernel.h>
40 #include <linux/string.h>
41 #include <linux/errno.h>
42 #include <linux/ioport.h>
43 #include <linux/slab.h>
44 #include <linux/netdevice.h>
45 #include <linux/etherdevice.h>
46 #include <linux/interrupt.h>
47 #include <linux/skbuff.h>
48 #include <linux/init.h>
49 #include <linux/zorro.h>
50 #include <linux/bitops.h>
51
52 #include <asm/amigaints.h>
53 #include <asm/amigahw.h>
54 #include <asm/irq.h>
55
56 #include "ariadne.h"
57
58
59 #ifdef ARIADNE_DEBUG
60 int ariadne_debug = ARIADNE_DEBUG;
61 #else
62 int ariadne_debug = 1;
63 #endif
64
65
66 /*
67 * Macros to Fix Endianness problems
68 */
69
70 /* Swap the Bytes in a WORD */
71 #define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00))
72 /* Get the Low BYTE in a WORD */
73 #define lowb(x) (x&0xff)
74 /* Get the Swapped High WORD in a LONG */
75 #define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
76 /* Get the Swapped Low WORD in a LONG */
77 #define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
78
79
80 /*
81 * Transmit/Receive Ring Definitions
82 */
83
84 #define TX_RING_SIZE 5
85 #define RX_RING_SIZE 16
86
87 #define PKT_BUF_SIZE 1520
88
89
90 /*
91 * Private Device Data
92 */
93
94 struct ariadne_private {
95 volatile struct TDRE *tx_ring[TX_RING_SIZE];
96 volatile struct RDRE *rx_ring[RX_RING_SIZE];
97 volatile u_short *tx_buff[TX_RING_SIZE];
98 volatile u_short *rx_buff[RX_RING_SIZE];
99 int cur_tx, cur_rx; /* The next free ring entry */
100 int dirty_tx; /* The ring entries to be free()ed. */
101 char tx_full;
102 };
103
104
105 /*
106 * Structure Created in the Ariadne's RAM Buffer
107 */
108
109 struct lancedata {
110 struct TDRE tx_ring[TX_RING_SIZE];
111 struct RDRE rx_ring[RX_RING_SIZE];
112 u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
113 u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
114 };
115
116 static int ariadne_open(struct net_device *dev);
117 static void ariadne_init_ring(struct net_device *dev);
118 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
119 static void ariadne_tx_timeout(struct net_device *dev);
120 static int ariadne_rx(struct net_device *dev);
121 static void ariadne_reset(struct net_device *dev);
122 static irqreturn_t ariadne_interrupt(int irq, void *data);
123 static int ariadne_close(struct net_device *dev);
124 static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
125 #ifdef HAVE_MULTICAST
126 static void set_multicast_list(struct net_device *dev);
127 #endif
128
129
130 static void memcpyw(volatile u_short *dest, u_short *src, int len)
131 {
132 while (len >= 2) {
133 *(dest++) = *(src++);
134 len -= 2;
135 }
136 if (len == 1)
137 *dest = (*(u_char *)src)<<8;
138 }
139
140
141 static int __devinit ariadne_init_one(struct zorro_dev *z,
142 const struct zorro_device_id *ent);
143 static void __devexit ariadne_remove_one(struct zorro_dev *z);
144
145
146 static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
147 { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
148 { 0 }
149 };
150
151 static struct zorro_driver ariadne_driver = {
152 .name = "ariadne",
153 .id_table = ariadne_zorro_tbl,
154 .probe = ariadne_init_one,
155 .remove = __devexit_p(ariadne_remove_one),
156 };
157
158 static const struct net_device_ops ariadne_netdev_ops = {
159 .ndo_open = ariadne_open,
160 .ndo_stop = ariadne_close,
161 .ndo_start_xmit = ariadne_start_xmit,
162 .ndo_tx_timeout = ariadne_tx_timeout,
163 .ndo_get_stats = ariadne_get_stats,
164 .ndo_set_multicast_list = set_multicast_list,
165 .ndo_validate_addr = eth_validate_addr,
166 .ndo_change_mtu = eth_change_mtu,
167 .ndo_set_mac_address = eth_mac_addr,
168 };
169
170 static int __devinit ariadne_init_one(struct zorro_dev *z,
171 const struct zorro_device_id *ent)
172 {
173 unsigned long board = z->resource.start;
174 unsigned long base_addr = board+ARIADNE_LANCE;
175 unsigned long mem_start = board+ARIADNE_RAM;
176 struct resource *r1, *r2;
177 struct net_device *dev;
178 struct ariadne_private *priv;
179 int err;
180
181 r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
182 if (!r1)
183 return -EBUSY;
184 r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
185 if (!r2) {
186 release_resource(r1);
187 return -EBUSY;
188 }
189
190 dev = alloc_etherdev(sizeof(struct ariadne_private));
191 if (dev == NULL) {
192 release_resource(r1);
193 release_resource(r2);
194 return -ENOMEM;
195 }
196
197 priv = netdev_priv(dev);
198
199 r1->name = dev->name;
200 r2->name = dev->name;
201
202 dev->dev_addr[0] = 0x00;
203 dev->dev_addr[1] = 0x60;
204 dev->dev_addr[2] = 0x30;
205 dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
206 dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
207 dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
208 dev->base_addr = ZTWO_VADDR(base_addr);
209 dev->mem_start = ZTWO_VADDR(mem_start);
210 dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
211
212 dev->netdev_ops = &ariadne_netdev_ops;
213 dev->watchdog_timeo = 5*HZ;
214
215 err = register_netdev(dev);
216 if (err) {
217 release_resource(r1);
218 release_resource(r2);
219 free_netdev(dev);
220 return err;
221 }
222 zorro_set_drvdata(z, dev);
223
224 printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address %pM\n",
225 dev->name, board, dev->dev_addr);
226
227 return 0;
228 }
229
230
231 static int ariadne_open(struct net_device *dev)
232 {
233 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
234 u_short in;
235 u_long version;
236 int i;
237
238 /* Reset the LANCE */
239 in = lance->Reset;
240
241 /* Stop the LANCE */
242 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
243 lance->RDP = STOP;
244
245 /* Check the LANCE version */
246 lance->RAP = CSR88; /* Chip ID */
247 version = swapw(lance->RDP);
248 lance->RAP = CSR89; /* Chip ID */
249 version |= swapw(lance->RDP)<<16;
250 if ((version & 0x00000fff) != 0x00000003) {
251 printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
252 return -EAGAIN;
253 }
254 if ((version & 0x0ffff000) != 0x00003000) {
255 printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
256 "number = %ld)\n", (version & 0x0ffff000)>>12);
257 return -EAGAIN;
258 }
259 #if 0
260 printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
261 (version & 0xf0000000)>>28);
262 #endif
263
264 ariadne_init_ring(dev);
265
266 /* Miscellaneous Stuff */
267 lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
268 lance->RDP = 0x0000;
269 lance->RAP = CSR4; /* Test and Features Control */
270 lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
271
272 /* Set the Multicast Table */
273 lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
274 lance->RDP = 0x0000;
275 lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
276 lance->RDP = 0x0000;
277 lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
278 lance->RDP = 0x0000;
279 lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
280 lance->RDP = 0x0000;
281
282 /* Set the Ethernet Hardware Address */
283 lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
284 lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
285 lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
286 lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
287 lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
288 lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
289
290 /* Set the Init Block Mode */
291 lance->RAP = CSR15; /* Mode Register */
292 lance->RDP = 0x0000;
293
294 /* Set the Transmit Descriptor Ring Pointer */
295 lance->RAP = CSR30; /* Base Address of Transmit Ring */
296 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
297 lance->RAP = CSR31; /* Base Address of transmit Ring */
298 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
299
300 /* Set the Receive Descriptor Ring Pointer */
301 lance->RAP = CSR24; /* Base Address of Receive Ring */
302 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
303 lance->RAP = CSR25; /* Base Address of Receive Ring */
304 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
305
306 /* Set the Number of RX and TX Ring Entries */
307 lance->RAP = CSR76; /* Receive Ring Length */
308 lance->RDP = swapw(((u_short)-RX_RING_SIZE));
309 lance->RAP = CSR78; /* Transmit Ring Length */
310 lance->RDP = swapw(((u_short)-TX_RING_SIZE));
311
312 /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
313 lance->RAP = ISACSR2; /* Miscellaneous Configuration */
314 lance->IDP = ASEL;
315
316 /* LED Control */
317 lance->RAP = ISACSR5; /* LED1 Status */
318 lance->IDP = PSE|XMTE;
319 lance->RAP = ISACSR6; /* LED2 Status */
320 lance->IDP = PSE|COLE;
321 lance->RAP = ISACSR7; /* LED3 Status */
322 lance->IDP = PSE|RCVE;
323
324 netif_start_queue(dev);
325
326 i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
327 dev->name, dev);
328 if (i) return i;
329
330 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
331 lance->RDP = INEA|STRT;
332
333 return 0;
334 }
335
336
337 static void ariadne_init_ring(struct net_device *dev)
338 {
339 struct ariadne_private *priv = netdev_priv(dev);
340 volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
341 int i;
342
343 netif_stop_queue(dev);
344
345 priv->tx_full = 0;
346 priv->cur_rx = priv->cur_tx = 0;
347 priv->dirty_tx = 0;
348
349 /* Set up TX Ring */
350 for (i = 0; i < TX_RING_SIZE; i++) {
351 volatile struct TDRE *t = &lancedata->tx_ring[i];
352 t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
353 t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
354 TF_STP | TF_ENP;
355 t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
356 t->TMD3 = 0;
357 priv->tx_ring[i] = &lancedata->tx_ring[i];
358 priv->tx_buff[i] = lancedata->tx_buff[i];
359 #if 0
360 printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
361 &lancedata->tx_ring[i], lancedata->tx_buff[i]);
362 #endif
363 }
364
365 /* Set up RX Ring */
366 for (i = 0; i < RX_RING_SIZE; i++) {
367 volatile struct RDRE *r = &lancedata->rx_ring[i];
368 r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
369 r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
370 RF_OWN;
371 r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
372 r->RMD3 = 0x0000;
373 priv->rx_ring[i] = &lancedata->rx_ring[i];
374 priv->rx_buff[i] = lancedata->rx_buff[i];
375 #if 0
376 printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
377 &lancedata->rx_ring[i], lancedata->rx_buff[i]);
378 #endif
379 }
380 }
381
382
383 static int ariadne_close(struct net_device *dev)
384 {
385 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
386
387 netif_stop_queue(dev);
388
389 lance->RAP = CSR112; /* Missed Frame Count */
390 dev->stats.rx_missed_errors = swapw(lance->RDP);
391 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
392
393 if (ariadne_debug > 1) {
394 printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
395 dev->name, lance->RDP);
396 printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
397 dev->stats.rx_missed_errors);
398 }
399
400 /* We stop the LANCE here -- it occasionally polls memory if we don't. */
401 lance->RDP = STOP;
402
403 free_irq(IRQ_AMIGA_PORTS, dev);
404
405 return 0;
406 }
407
408
409 static inline void ariadne_reset(struct net_device *dev)
410 {
411 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
412
413 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
414 lance->RDP = STOP;
415 ariadne_init_ring(dev);
416 lance->RDP = INEA|STRT;
417 netif_start_queue(dev);
418 }
419
420
421 static irqreturn_t ariadne_interrupt(int irq, void *data)
422 {
423 struct net_device *dev = (struct net_device *)data;
424 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
425 struct ariadne_private *priv;
426 int csr0, boguscnt;
427 int handled = 0;
428
429 if (dev == NULL) {
430 printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
431 return IRQ_NONE;
432 }
433
434 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
435
436 if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
437 return IRQ_NONE; /* generated by the board. */
438
439 priv = netdev_priv(dev);
440
441 boguscnt = 10;
442 while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
443 /* Acknowledge all of the current interrupt sources ASAP. */
444 lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
445
446 #if 0
447 if (ariadne_debug > 5) {
448 printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.",
449 dev->name, csr0, lance->RDP);
450 printk("[");
451 if (csr0 & INTR)
452 printk(" INTR");
453 if (csr0 & INEA)
454 printk(" INEA");
455 if (csr0 & RXON)
456 printk(" RXON");
457 if (csr0 & TXON)
458 printk(" TXON");
459 if (csr0 & TDMD)
460 printk(" TDMD");
461 if (csr0 & STOP)
462 printk(" STOP");
463 if (csr0 & STRT)
464 printk(" STRT");
465 if (csr0 & INIT)
466 printk(" INIT");
467 if (csr0 & ERR)
468 printk(" ERR");
469 if (csr0 & BABL)
470 printk(" BABL");
471 if (csr0 & CERR)
472 printk(" CERR");
473 if (csr0 & MISS)
474 printk(" MISS");
475 if (csr0 & MERR)
476 printk(" MERR");
477 if (csr0 & RINT)
478 printk(" RINT");
479 if (csr0 & TINT)
480 printk(" TINT");
481 if (csr0 & IDON)
482 printk(" IDON");
483 printk(" ]\n");
484 }
485 #endif
486
487 if (csr0 & RINT) { /* Rx interrupt */
488 handled = 1;
489 ariadne_rx(dev);
490 }
491
492 if (csr0 & TINT) { /* Tx-done interrupt */
493 int dirty_tx = priv->dirty_tx;
494
495 handled = 1;
496 while (dirty_tx < priv->cur_tx) {
497 int entry = dirty_tx % TX_RING_SIZE;
498 int status = lowb(priv->tx_ring[entry]->TMD1);
499
500 if (status & TF_OWN)
501 break; /* It still hasn't been Txed */
502
503 priv->tx_ring[entry]->TMD1 &= 0xff00;
504
505 if (status & TF_ERR) {
506 /* There was an major error, log it. */
507 int err_status = priv->tx_ring[entry]->TMD3;
508 dev->stats.tx_errors++;
509 if (err_status & EF_RTRY)
510 dev->stats.tx_aborted_errors++;
511 if (err_status & EF_LCAR)
512 dev->stats.tx_carrier_errors++;
513 if (err_status & EF_LCOL)
514 dev->stats.tx_window_errors++;
515 if (err_status & EF_UFLO) {
516 /* Ackk! On FIFO errors the Tx unit is turned off! */
517 dev->stats.tx_fifo_errors++;
518 /* Remove this verbosity later! */
519 printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
520 dev->name, csr0);
521 /* Restart the chip. */
522 lance->RDP = STRT;
523 }
524 } else {
525 if (status & (TF_MORE|TF_ONE))
526 dev->stats.collisions++;
527 dev->stats.tx_packets++;
528 }
529 dirty_tx++;
530 }
531
532 #ifndef final_version
533 if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
534 printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
535 "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
536 dirty_tx += TX_RING_SIZE;
537 }
538 #endif
539
540 if (priv->tx_full && netif_queue_stopped(dev) &&
541 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
542 /* The ring is no longer full. */
543 priv->tx_full = 0;
544 netif_wake_queue(dev);
545 }
546
547 priv->dirty_tx = dirty_tx;
548 }
549
550 /* Log misc errors. */
551 if (csr0 & BABL) {
552 handled = 1;
553 dev->stats.tx_errors++; /* Tx babble. */
554 }
555 if (csr0 & MISS) {
556 handled = 1;
557 dev->stats.rx_errors++; /* Missed a Rx frame. */
558 }
559 if (csr0 & MERR) {
560 handled = 1;
561 printk(KERN_ERR "%s: Bus master arbitration failure, status "
562 "%4.4x.\n", dev->name, csr0);
563 /* Restart the chip. */
564 lance->RDP = STRT;
565 }
566 }
567
568 /* Clear any other interrupt, and set interrupt enable. */
569 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
570 lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
571
572 #if 0
573 if (ariadne_debug > 4)
574 printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
575 lance->RAP, lance->RDP);
576 #endif
577 return IRQ_RETVAL(handled);
578 }
579
580
581 static void ariadne_tx_timeout(struct net_device *dev)
582 {
583 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
584
585 printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
586 dev->name, lance->RDP);
587 ariadne_reset(dev);
588 netif_wake_queue(dev);
589 }
590
591
592 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
593 {
594 struct ariadne_private *priv = netdev_priv(dev);
595 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
596 int entry;
597 unsigned long flags;
598 int len = skb->len;
599
600 #if 0
601 if (ariadne_debug > 3) {
602 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
603 printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
604 dev->name, lance->RDP);
605 lance->RDP = 0x0000;
606 }
607 #endif
608
609 /* FIXME: is the 79C960 new enough to do its own padding right ? */
610 if (skb->len < ETH_ZLEN)
611 {
612 if (skb_padto(skb, ETH_ZLEN))
613 return 0;
614 len = ETH_ZLEN;
615 }
616
617 /* Fill in a Tx ring entry */
618
619 #if 0
620 {
621 printk(KERN_DEBUG "TX pkt type 0x%04x from %pM to %pM "
622 " data 0x%08x len %d\n",
623 ((u_short *)skb->data)[6],
624 skb->data + 6, skb->data,
625 (int)skb->data, (int)skb->len);
626 }
627 #endif
628
629 local_irq_save(flags);
630
631 entry = priv->cur_tx % TX_RING_SIZE;
632
633 /* Caution: the write order is important here, set the base address with
634 the "ownership" bits last. */
635
636 priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
637 priv->tx_ring[entry]->TMD3 = 0x0000;
638 memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
639
640 #if 0
641 {
642 int i, len;
643
644 len = skb->len > 64 ? 64 : skb->len;
645 len >>= 1;
646 for (i = 0; i < len; i += 8) {
647 int j;
648 printk(KERN_DEBUG "%04x:", i);
649 for (j = 0; (j < 8) && ((i+j) < len); j++) {
650 if (!(j & 1))
651 printk(" ");
652 printk("%04x", priv->tx_buff[entry][i+j]);
653 }
654 printk("\n");
655 }
656 }
657 #endif
658
659 priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
660
661 dev_kfree_skb(skb);
662
663 priv->cur_tx++;
664 if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
665
666 #if 0
667 printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
668 "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
669 #endif
670
671 priv->cur_tx -= TX_RING_SIZE;
672 priv->dirty_tx -= TX_RING_SIZE;
673 }
674 dev->stats.tx_bytes += len;
675
676 /* Trigger an immediate send poll. */
677 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
678 lance->RDP = INEA|TDMD;
679
680 dev->trans_start = jiffies;
681
682 if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
683 netif_stop_queue(dev);
684 priv->tx_full = 1;
685 }
686 local_irq_restore(flags);
687
688 return 0;
689 }
690
691
692 static int ariadne_rx(struct net_device *dev)
693 {
694 struct ariadne_private *priv = netdev_priv(dev);
695 int entry = priv->cur_rx % RX_RING_SIZE;
696 int i;
697
698 /* If we own the next entry, it's a new packet. Send it up. */
699 while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
700 int status = lowb(priv->rx_ring[entry]->RMD1);
701
702 if (status != (RF_STP|RF_ENP)) { /* There was an error. */
703 /* There is a tricky error noted by John Murphy,
704 <murf@perftech.com> to Russ Nelson: Even with full-sized
705 buffers it's possible for a jabber packet to use two
706 buffers, with only the last correctly noting the error. */
707 if (status & RF_ENP)
708 /* Only count a general error at the end of a packet.*/
709 dev->stats.rx_errors++;
710 if (status & RF_FRAM)
711 dev->stats.rx_frame_errors++;
712 if (status & RF_OFLO)
713 dev->stats.rx_over_errors++;
714 if (status & RF_CRC)
715 dev->stats.rx_crc_errors++;
716 if (status & RF_BUFF)
717 dev->stats.rx_fifo_errors++;
718 priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
719 } else {
720 /* Malloc up new buffer, compatible with net-3. */
721 short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
722 struct sk_buff *skb;
723
724 skb = dev_alloc_skb(pkt_len+2);
725 if (skb == NULL) {
726 printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
727 dev->name);
728 for (i = 0; i < RX_RING_SIZE; i++)
729 if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
730 break;
731
732 if (i > RX_RING_SIZE-2) {
733 dev->stats.rx_dropped++;
734 priv->rx_ring[entry]->RMD1 |= RF_OWN;
735 priv->cur_rx++;
736 }
737 break;
738 }
739
740
741 skb_reserve(skb,2); /* 16 byte align */
742 skb_put(skb,pkt_len); /* Make room */
743 skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
744 skb->protocol=eth_type_trans(skb,dev);
745 #if 0
746 {
747 printk(KERN_DEBUG "RX pkt type 0x%04x from ",
748 ((u_short *)skb->data)[6]);
749 {
750 u_char *ptr = &((u_char *)skb->data)[6];
751 printk("%pM", ptr);
752 }
753 printk(" to ");
754 {
755 u_char *ptr = (u_char *)skb->data;
756 printk("%pM", ptr);
757 }
758 printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
759 }
760 #endif
761
762 netif_rx(skb);
763 dev->stats.rx_packets++;
764 dev->stats.rx_bytes += pkt_len;
765 }
766
767 priv->rx_ring[entry]->RMD1 |= RF_OWN;
768 entry = (++priv->cur_rx) % RX_RING_SIZE;
769 }
770
771 priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
772
773 /* We should check that at least two ring entries are free. If not,
774 we should free one and mark stats->rx_dropped++. */
775
776 return 0;
777 }
778
779
780 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
781 {
782 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
783 short saved_addr;
784 unsigned long flags;
785
786 local_irq_save(flags);
787 saved_addr = lance->RAP;
788 lance->RAP = CSR112; /* Missed Frame Count */
789 dev->stats.rx_missed_errors = swapw(lance->RDP);
790 lance->RAP = saved_addr;
791 local_irq_restore(flags);
792
793 return &dev->stats;
794 }
795
796
797 /* Set or clear the multicast filter for this adaptor.
798 num_addrs == -1 Promiscuous mode, receive all packets
799 num_addrs == 0 Normal mode, clear multicast list
800 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
801 best-effort filtering.
802 */
803 static void set_multicast_list(struct net_device *dev)
804 {
805 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
806
807 if (!netif_running(dev))
808 return;
809
810 netif_stop_queue(dev);
811
812 /* We take the simple way out and always enable promiscuous mode. */
813 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
814 lance->RDP = STOP; /* Temporarily stop the lance. */
815 ariadne_init_ring(dev);
816
817 if (dev->flags & IFF_PROMISC) {
818 lance->RAP = CSR15; /* Mode Register */
819 lance->RDP = PROM; /* Set promiscuous mode */
820 } else {
821 short multicast_table[4];
822 int num_addrs = dev->mc_count;
823 int i;
824 /* We don't use the multicast table, but rely on upper-layer filtering. */
825 memset(multicast_table, (num_addrs == 0) ? 0 : -1,
826 sizeof(multicast_table));
827 for (i = 0; i < 4; i++) {
828 lance->RAP = CSR8+(i<<8); /* Logical Address Filter */
829 lance->RDP = swapw(multicast_table[i]);
830 }
831 lance->RAP = CSR15; /* Mode Register */
832 lance->RDP = 0x0000; /* Unset promiscuous mode */
833 }
834
835 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
836 lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */
837
838 netif_wake_queue(dev);
839 }
840
841
842 static void __devexit ariadne_remove_one(struct zorro_dev *z)
843 {
844 struct net_device *dev = zorro_get_drvdata(z);
845
846 unregister_netdev(dev);
847 release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
848 release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
849 free_netdev(dev);
850 }
851
852 static int __init ariadne_init_module(void)
853 {
854 return zorro_register_driver(&ariadne_driver);
855 }
856
857 static void __exit ariadne_cleanup_module(void)
858 {
859 zorro_unregister_driver(&ariadne_driver);
860 }
861
862 module_init(ariadne_init_module);
863 module_exit(ariadne_cleanup_module);
864
865 MODULE_LICENSE("GPL");
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