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/netdevice.h>
44#include <linux/etherdevice.h>
45#include <linux/interrupt.h>
46#include <linux/skbuff.h>
47#include <linux/init.h>
48#include <linux/zorro.h>
49#include <linux/bitops.h>
50
51#include <asm/amigaints.h>
52#include <asm/amigahw.h>
53#include <asm/irq.h>
54
55#include "ariadne.h"
56
57
58#ifdef ARIADNE_DEBUG
59int ariadne_debug = ARIADNE_DEBUG;
60#else
61int ariadne_debug = 1;
62#endif
63
64
65 /*
66 * Macros to Fix Endianness problems
67 */
68
69 /* Swap the Bytes in a WORD */
70#define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00))
71 /* Get the Low BYTE in a WORD */
72#define lowb(x) (x&0xff)
73 /* Get the Swapped High WORD in a LONG */
74#define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
75 /* Get the Swapped Low WORD in a LONG */
76#define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
77
78
79 /*
80 * Transmit/Receive Ring Definitions
81 */
82
83#define TX_RING_SIZE 5
84#define RX_RING_SIZE 16
85
86#define PKT_BUF_SIZE 1520
87
88
89 /*
90 * Private Device Data
91 */
92
93struct ariadne_private {
94 volatile struct TDRE *tx_ring[TX_RING_SIZE];
95 volatile struct RDRE *rx_ring[RX_RING_SIZE];
96 volatile u_short *tx_buff[TX_RING_SIZE];
97 volatile u_short *rx_buff[RX_RING_SIZE];
98 int cur_tx, cur_rx; /* The next free ring entry */
99 int dirty_tx; /* The ring entries to be free()ed. */
100 char tx_full;
101};
102
103
104 /*
105 * Structure Created in the Ariadne's RAM Buffer
106 */
107
108struct lancedata {
109 struct TDRE tx_ring[TX_RING_SIZE];
110 struct RDRE rx_ring[RX_RING_SIZE];
111 u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
112 u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
113};
114
115static int ariadne_open(struct net_device *dev);
116static void ariadne_init_ring(struct net_device *dev);
117static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
118 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);
125static void set_multicast_list(struct net_device *dev);
126
127
128static void memcpyw(volatile u_short *dest, u_short *src, int len)
129{
130 while (len >= 2) {
131 *(dest++) = *(src++);
132 len -= 2;
133 }
134 if (len == 1)
135 *dest = (*(u_char *)src)<<8;
136}
137
138
139static int __devinit ariadne_init_one(struct zorro_dev *z,
140 const struct zorro_device_id *ent);
141static void __devexit ariadne_remove_one(struct zorro_dev *z);
142
143
144static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
145 { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
146 { 0 }
147};
148MODULE_DEVICE_TABLE(zorro, ariadne_zorro_tbl);
149
150static struct zorro_driver ariadne_driver = {
151 .name = "ariadne",
152 .id_table = ariadne_zorro_tbl,
153 .probe = ariadne_init_one,
154 .remove = __devexit_p(ariadne_remove_one),
155};
156
157static const struct net_device_ops ariadne_netdev_ops = {
158 .ndo_open = ariadne_open,
159 .ndo_stop = ariadne_close,
160 .ndo_start_xmit = ariadne_start_xmit,
161 .ndo_tx_timeout = ariadne_tx_timeout,
162 .ndo_get_stats = ariadne_get_stats,
163 .ndo_set_multicast_list = set_multicast_list,
164 .ndo_validate_addr = eth_validate_addr,
165 .ndo_change_mtu = eth_change_mtu,
166 .ndo_set_mac_address = eth_mac_addr,
167};
168
169static int __devinit ariadne_init_one(struct zorro_dev *z,
170 const struct zorro_device_id *ent)
171{
172 unsigned long board = z->resource.start;
173 unsigned long base_addr = board+ARIADNE_LANCE;
174 unsigned long mem_start = board+ARIADNE_RAM;
175 struct resource *r1, *r2;
176 struct net_device *dev;
177 struct ariadne_private *priv;
178 int err;
179
180 r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
181 if (!r1)
182 return -EBUSY;
183 r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
184 if (!r2) {
185 release_mem_region(base_addr, sizeof(struct Am79C960));
186 return -EBUSY;
187 }
188
189 dev = alloc_etherdev(sizeof(struct ariadne_private));
190 if (dev == NULL) {
191 release_mem_region(base_addr, sizeof(struct Am79C960));
192 release_mem_region(mem_start, ARIADNE_RAM_SIZE);
193 return -ENOMEM;
194 }
195
196 priv = netdev_priv(dev);
197
198 r1->name = dev->name;
199 r2->name = dev->name;
200
201 dev->dev_addr[0] = 0x00;
202 dev->dev_addr[1] = 0x60;
203 dev->dev_addr[2] = 0x30;
204 dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
205 dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
206 dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
207 dev->base_addr = ZTWO_VADDR(base_addr);
208 dev->mem_start = ZTWO_VADDR(mem_start);
209 dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
210
211 dev->netdev_ops = &ariadne_netdev_ops;
212 dev->watchdog_timeo = 5*HZ;
213
214 err = register_netdev(dev);
215 if (err) {
216 release_mem_region(base_addr, sizeof(struct Am79C960));
217 release_mem_region(mem_start, ARIADNE_RAM_SIZE);
218 free_netdev(dev);
219 return err;
220 }
221 zorro_set_drvdata(z, dev);
222
223 printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address %pM\n",
224 dev->name, board, dev->dev_addr);
225
226 return 0;
227}
228
229
230static int ariadne_open(struct net_device *dev)
231{
232 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
233 u_short in;
234 u_long version;
235 int i;
236
237 /* Reset the LANCE */
238 in = lance->Reset;
239
240 /* Stop the LANCE */
241 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
242 lance->RDP = STOP;
243
244 /* Check the LANCE version */
245 lance->RAP = CSR88; /* Chip ID */
246 version = swapw(lance->RDP);
247 lance->RAP = CSR89; /* Chip ID */
248 version |= swapw(lance->RDP)<<16;
249 if ((version & 0x00000fff) != 0x00000003) {
250 printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
251 return -EAGAIN;
252 }
253 if ((version & 0x0ffff000) != 0x00003000) {
254 printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
255 "number = %ld)\n", (version & 0x0ffff000)>>12);
256 return -EAGAIN;
257 }
258#if 0
259 printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
260 (version & 0xf0000000)>>28);
261#endif
262
263 ariadne_init_ring(dev);
264
265 /* Miscellaneous Stuff */
266 lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
267 lance->RDP = 0x0000;
268 lance->RAP = CSR4; /* Test and Features Control */
269 lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
270
271 /* Set the Multicast Table */
272 lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
273 lance->RDP = 0x0000;
274 lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
275 lance->RDP = 0x0000;
276 lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
277 lance->RDP = 0x0000;
278 lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
279 lance->RDP = 0x0000;
280
281 /* Set the Ethernet Hardware Address */
282 lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
283 lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
284 lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
285 lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
286 lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
287 lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
288
289 /* Set the Init Block Mode */
290 lance->RAP = CSR15; /* Mode Register */
291 lance->RDP = 0x0000;
292
293 /* Set the Transmit Descriptor Ring Pointer */
294 lance->RAP = CSR30; /* Base Address of Transmit Ring */
295 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
296 lance->RAP = CSR31; /* Base Address of transmit Ring */
297 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
298
299 /* Set the Receive Descriptor Ring Pointer */
300 lance->RAP = CSR24; /* Base Address of Receive Ring */
301 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
302 lance->RAP = CSR25; /* Base Address of Receive Ring */
303 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
304
305 /* Set the Number of RX and TX Ring Entries */
306 lance->RAP = CSR76; /* Receive Ring Length */
307 lance->RDP = swapw(((u_short)-RX_RING_SIZE));
308 lance->RAP = CSR78; /* Transmit Ring Length */
309 lance->RDP = swapw(((u_short)-TX_RING_SIZE));
310
311 /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
312 lance->RAP = ISACSR2; /* Miscellaneous Configuration */
313 lance->IDP = ASEL;
314
315 /* LED Control */
316 lance->RAP = ISACSR5; /* LED1 Status */
317 lance->IDP = PSE|XMTE;
318 lance->RAP = ISACSR6; /* LED2 Status */
319 lance->IDP = PSE|COLE;
320 lance->RAP = ISACSR7; /* LED3 Status */
321 lance->IDP = PSE|RCVE;
322
323 netif_start_queue(dev);
324
325 i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
326 dev->name, dev);
327 if (i) return i;
328
329 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
330 lance->RDP = INEA|STRT;
331
332 return 0;
333}
334
335
336static void ariadne_init_ring(struct net_device *dev)
337{
338 struct ariadne_private *priv = netdev_priv(dev);
339 volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
340 int i;
341
342 netif_stop_queue(dev);
343
344 priv->tx_full = 0;
345 priv->cur_rx = priv->cur_tx = 0;
346 priv->dirty_tx = 0;
347
348 /* Set up TX Ring */
349 for (i = 0; i < TX_RING_SIZE; i++) {
350 volatile struct TDRE *t = &lancedata->tx_ring[i];
351 t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
352 t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
353 TF_STP | TF_ENP;
354 t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
355 t->TMD3 = 0;
356 priv->tx_ring[i] = &lancedata->tx_ring[i];
357 priv->tx_buff[i] = lancedata->tx_buff[i];
358#if 0
359 printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
360 &lancedata->tx_ring[i], lancedata->tx_buff[i]);
361#endif
362 }
363
364 /* Set up RX Ring */
365 for (i = 0; i < RX_RING_SIZE; i++) {
366 volatile struct RDRE *r = &lancedata->rx_ring[i];
367 r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
368 r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
369 RF_OWN;
370 r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
371 r->RMD3 = 0x0000;
372 priv->rx_ring[i] = &lancedata->rx_ring[i];
373 priv->rx_buff[i] = lancedata->rx_buff[i];
374#if 0
375 printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
376 &lancedata->rx_ring[i], lancedata->rx_buff[i]);
377#endif
378 }
379}
380
381
382static int ariadne_close(struct net_device *dev)
383{
384 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
385
386 netif_stop_queue(dev);
387
388 lance->RAP = CSR112; /* Missed Frame Count */
389 dev->stats.rx_missed_errors = swapw(lance->RDP);
390 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
391
392 if (ariadne_debug > 1) {
393 printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
394 dev->name, lance->RDP);
395 printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
396 dev->stats.rx_missed_errors);
397 }
398
399 /* We stop the LANCE here -- it occasionally polls memory if we don't. */
400 lance->RDP = STOP;
401
402 free_irq(IRQ_AMIGA_PORTS, dev);
403
404 return 0;
405}
406
407
408static inline void ariadne_reset(struct net_device *dev)
409{
410 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
411
412 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
413 lance->RDP = STOP;
414 ariadne_init_ring(dev);
415 lance->RDP = INEA|STRT;
416 netif_start_queue(dev);
417}
418
419
420static irqreturn_t ariadne_interrupt(int irq, void *data)
421{
422 struct net_device *dev = (struct net_device *)data;
423 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
424 struct ariadne_private *priv;
425 int csr0, boguscnt;
426 int handled = 0;
427
428 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
429
430 if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
431 return IRQ_NONE; /* generated by the board. */
432
433 priv = netdev_priv(dev);
434
435 boguscnt = 10;
436 while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
437 /* Acknowledge all of the current interrupt sources ASAP. */
438 lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
439
440#if 0
441 if (ariadne_debug > 5) {
442 printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.",
443 dev->name, csr0, lance->RDP);
444 printk("[");
445 if (csr0 & INTR)
446 printk(" INTR");
447 if (csr0 & INEA)
448 printk(" INEA");
449 if (csr0 & RXON)
450 printk(" RXON");
451 if (csr0 & TXON)
452 printk(" TXON");
453 if (csr0 & TDMD)
454 printk(" TDMD");
455 if (csr0 & STOP)
456 printk(" STOP");
457 if (csr0 & STRT)
458 printk(" STRT");
459 if (csr0 & INIT)
460 printk(" INIT");
461 if (csr0 & ERR)
462 printk(" ERR");
463 if (csr0 & BABL)
464 printk(" BABL");
465 if (csr0 & CERR)
466 printk(" CERR");
467 if (csr0 & MISS)
468 printk(" MISS");
469 if (csr0 & MERR)
470 printk(" MERR");
471 if (csr0 & RINT)
472 printk(" RINT");
473 if (csr0 & TINT)
474 printk(" TINT");
475 if (csr0 & IDON)
476 printk(" IDON");
477 printk(" ]\n");
478 }
479#endif
480
481 if (csr0 & RINT) { /* Rx interrupt */
482 handled = 1;
483 ariadne_rx(dev);
484 }
485
486 if (csr0 & TINT) { /* Tx-done interrupt */
487 int dirty_tx = priv->dirty_tx;
488
489 handled = 1;
490 while (dirty_tx < priv->cur_tx) {
491 int entry = dirty_tx % TX_RING_SIZE;
492 int status = lowb(priv->tx_ring[entry]->TMD1);
493
494 if (status & TF_OWN)
495 break; /* It still hasn't been Txed */
496
497 priv->tx_ring[entry]->TMD1 &= 0xff00;
498
499 if (status & TF_ERR) {
500 /* There was an major error, log it. */
501 int err_status = priv->tx_ring[entry]->TMD3;
502 dev->stats.tx_errors++;
503 if (err_status & EF_RTRY)
504 dev->stats.tx_aborted_errors++;
505 if (err_status & EF_LCAR)
506 dev->stats.tx_carrier_errors++;
507 if (err_status & EF_LCOL)
508 dev->stats.tx_window_errors++;
509 if (err_status & EF_UFLO) {
510 /* Ackk! On FIFO errors the Tx unit is turned off! */
511 dev->stats.tx_fifo_errors++;
512 /* Remove this verbosity later! */
513 printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
514 dev->name, csr0);
515 /* Restart the chip. */
516 lance->RDP = STRT;
517 }
518 } else {
519 if (status & (TF_MORE|TF_ONE))
520 dev->stats.collisions++;
521 dev->stats.tx_packets++;
522 }
523 dirty_tx++;
524 }
525
526#ifndef final_version
527 if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
528 printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
529 "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
530 dirty_tx += TX_RING_SIZE;
531 }
532#endif
533
534 if (priv->tx_full && netif_queue_stopped(dev) &&
535 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
536 /* The ring is no longer full. */
537 priv->tx_full = 0;
538 netif_wake_queue(dev);
539 }
540
541 priv->dirty_tx = dirty_tx;
542 }
543
544 /* Log misc errors. */
545 if (csr0 & BABL) {
546 handled = 1;
547 dev->stats.tx_errors++; /* Tx babble. */
548 }
549 if (csr0 & MISS) {
550 handled = 1;
551 dev->stats.rx_errors++; /* Missed a Rx frame. */
552 }
553 if (csr0 & MERR) {
554 handled = 1;
555 printk(KERN_ERR "%s: Bus master arbitration failure, status "
556 "%4.4x.\n", dev->name, csr0);
557 /* Restart the chip. */
558 lance->RDP = STRT;
559 }
560 }
561
562 /* Clear any other interrupt, and set interrupt enable. */
563 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
564 lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
565
566#if 0
567 if (ariadne_debug > 4)
568 printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
569 lance->RAP, lance->RDP);
570#endif
571 return IRQ_RETVAL(handled);
572}
573
574
575static void ariadne_tx_timeout(struct net_device *dev)
576{
577 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
578
579 printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
580 dev->name, lance->RDP);
581 ariadne_reset(dev);
582 netif_wake_queue(dev);
583}
584
585
586static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
587 struct net_device *dev)
588{
589 struct ariadne_private *priv = netdev_priv(dev);
590 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
591 int entry;
592 unsigned long flags;
593 int len = skb->len;
594
595#if 0
596 if (ariadne_debug > 3) {
597 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
598 printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
599 dev->name, lance->RDP);
600 lance->RDP = 0x0000;
601 }
602#endif
603
604 /* FIXME: is the 79C960 new enough to do its own padding right ? */
605 if (skb->len < ETH_ZLEN)
606 {
607 if (skb_padto(skb, ETH_ZLEN))
608 return NETDEV_TX_OK;
609 len = ETH_ZLEN;
610 }
611
612 /* Fill in a Tx ring entry */
613
614#if 0
615{
616 printk(KERN_DEBUG "TX pkt type 0x%04x from %pM to %pM "
617 " data 0x%08x len %d\n",
618 ((u_short *)skb->data)[6],
619 skb->data + 6, skb->data,
620 (int)skb->data, (int)skb->len);
621}
622#endif
623
624 local_irq_save(flags);
625
626 entry = priv->cur_tx % TX_RING_SIZE;
627
628 /* Caution: the write order is important here, set the base address with
629 the "ownership" bits last. */
630
631 priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
632 priv->tx_ring[entry]->TMD3 = 0x0000;
633 memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
634
635#if 0
636 {
637 int i, len;
638
639 len = skb->len > 64 ? 64 : skb->len;
640 len >>= 1;
641 for (i = 0; i < len; i += 8) {
642 int j;
643 printk(KERN_DEBUG "%04x:", i);
644 for (j = 0; (j < 8) && ((i+j) < len); j++) {
645 if (!(j & 1))
646 printk(" ");
647 printk("%04x", priv->tx_buff[entry][i+j]);
648 }
649 printk("\n");
650 }
651 }
652#endif
653
654 priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
655
656 dev_kfree_skb(skb);
657
658 priv->cur_tx++;
659 if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
660
661#if 0
662 printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
663 "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
664#endif
665
666 priv->cur_tx -= TX_RING_SIZE;
667 priv->dirty_tx -= TX_RING_SIZE;
668 }
669 dev->stats.tx_bytes += len;
670
671 /* Trigger an immediate send poll. */
672 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
673 lance->RDP = INEA|TDMD;
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 NETDEV_TX_OK;
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 = netdev_mc_count(dev);
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");