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