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net: trans_start cleanups
[deliverable/linux.git] / drivers / net / ariadne.c
CommitLineData
1da177e4
LT		 1/*
2 * Amiga Linux/m68k Ariadne Ethernet Driver
3 *
96de0e25 4 * © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
1da177e4
LT		 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>
1da177e4
LT		 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. */
1da177e4
LT		 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);
61357325
SH		 117static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
118 struct net_device *dev);
1da177e4
LT		 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);
7d12e780 122static irqreturn_t ariadne_interrupt(int irq, void *data);
1da177e4
LT		 123static int ariadne_close(struct net_device *dev);
124static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
1da177e4 125static void set_multicast_list(struct net_device *dev);
1da177e4
LT		 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};
148
149static struct zorro_driver ariadne_driver = {
150 .name = "ariadne",
151 .id_table = ariadne_zorro_tbl,
152 .probe = ariadne_init_one,
153 .remove = __devexit_p(ariadne_remove_one),
154};
155
f97b1f2a
AB		 156static const struct net_device_ops ariadne_netdev_ops = {
157 .ndo_open = ariadne_open,
158 .ndo_stop = ariadne_close,
159 .ndo_start_xmit = ariadne_start_xmit,
160 .ndo_tx_timeout = ariadne_tx_timeout,
161 .ndo_get_stats = ariadne_get_stats,
162 .ndo_set_multicast_list = set_multicast_list,
163 .ndo_validate_addr = eth_validate_addr,
164 .ndo_change_mtu = eth_change_mtu,
165 .ndo_set_mac_address = eth_mac_addr,
166};
167
1da177e4
LT		 168static int __devinit ariadne_init_one(struct zorro_dev *z,
169 const struct zorro_device_id *ent)
170{
171 unsigned long board = z->resource.start;
172 unsigned long base_addr = board+ARIADNE_LANCE;
173 unsigned long mem_start = board+ARIADNE_RAM;
174 struct resource *r1, *r2;
175 struct net_device *dev;
176 struct ariadne_private *priv;
177 int err;
178
179 r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
180 if (!r1)
181 return -EBUSY;
182 r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
183 if (!r2) {
184 release_resource(r1);
185 return -EBUSY;
186 }
187
188 dev = alloc_etherdev(sizeof(struct ariadne_private));
189 if (dev == NULL) {
190 release_resource(r1);
191 release_resource(r2);
192 return -ENOMEM;
193 }
194
1da177e4
LT		 195 priv = netdev_priv(dev);
196
197 r1->name = dev->name;
198 r2->name = dev->name;
199
200 dev->dev_addr[0] = 0x00;
201 dev->dev_addr[1] = 0x60;
202 dev->dev_addr[2] = 0x30;
203 dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
204 dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
205 dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
206 dev->base_addr = ZTWO_VADDR(base_addr);
207 dev->mem_start = ZTWO_VADDR(mem_start);
208 dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
209
f97b1f2a 210 dev->netdev_ops = &ariadne_netdev_ops;
1da177e4 211 dev->watchdog_timeo = 5*HZ;
1da177e4
LT		 212
213 err = register_netdev(dev);
214 if (err) {
215 release_resource(r1);
216 release_resource(r2);
217 free_netdev(dev);
218 return err;
219 }
220 zorro_set_drvdata(z, dev);
221
e174961c
JB		 222 printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address %pM\n",
223 dev->name, board, dev->dev_addr);
1da177e4
LT		 224
225 return 0;
226}
227
228
229static int ariadne_open(struct net_device *dev)
230{
231 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
232 u_short in;
233 u_long version;
234 int i;
235
236 /* Reset the LANCE */
237 in = lance->Reset;
238
239 /* Stop the LANCE */
240 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
241 lance->RDP = STOP;
242
243 /* Check the LANCE version */
244 lance->RAP = CSR88; /* Chip ID */
245 version = swapw(lance->RDP);
246 lance->RAP = CSR89; /* Chip ID */
247 version |= swapw(lance->RDP)<<16;
248 if ((version & 0x00000fff) != 0x00000003) {
249 printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
250 return -EAGAIN;
251 }
252 if ((version & 0x0ffff000) != 0x00003000) {
253 printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
254 "number = %ld)\n", (version & 0x0ffff000)>>12);
255 return -EAGAIN;
256 }
257#if 0
258 printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
259 (version & 0xf0000000)>>28);
260#endif
261
262 ariadne_init_ring(dev);
263
264 /* Miscellaneous Stuff */
265 lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
266 lance->RDP = 0x0000;
267 lance->RAP = CSR4; /* Test and Features Control */
268 lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
269
270 /* Set the Multicast Table */
271 lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
272 lance->RDP = 0x0000;
273 lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
274 lance->RDP = 0x0000;
275 lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
276 lance->RDP = 0x0000;
277 lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
278 lance->RDP = 0x0000;
279
280 /* Set the Ethernet Hardware Address */
281 lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
282 lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
283 lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
284 lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
285 lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
286 lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
287
288 /* Set the Init Block Mode */
289 lance->RAP = CSR15; /* Mode Register */
290 lance->RDP = 0x0000;
291
292 /* Set the Transmit Descriptor Ring Pointer */
293 lance->RAP = CSR30; /* Base Address of Transmit Ring */
294 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
295 lance->RAP = CSR31; /* Base Address of transmit Ring */
296 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
297
298 /* Set the Receive Descriptor Ring Pointer */
299 lance->RAP = CSR24; /* Base Address of Receive Ring */
300 lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
301 lance->RAP = CSR25; /* Base Address of Receive Ring */
302 lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
303
304 /* Set the Number of RX and TX Ring Entries */
305 lance->RAP = CSR76; /* Receive Ring Length */
306 lance->RDP = swapw(((u_short)-RX_RING_SIZE));
307 lance->RAP = CSR78; /* Transmit Ring Length */
308 lance->RDP = swapw(((u_short)-TX_RING_SIZE));
309
310 /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
311 lance->RAP = ISACSR2; /* Miscellaneous Configuration */
312 lance->IDP = ASEL;
313
314 /* LED Control */
315 lance->RAP = ISACSR5; /* LED1 Status */
316 lance->IDP = PSE|XMTE;
317 lance->RAP = ISACSR6; /* LED2 Status */
318 lance->IDP = PSE|COLE;
319 lance->RAP = ISACSR7; /* LED3 Status */
320 lance->IDP = PSE|RCVE;
321
322 netif_start_queue(dev);
323
1fb9df5d 324 i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
1da177e4
LT		 325 dev->name, dev);
326 if (i) return i;
327
328 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
329 lance->RDP = INEA|STRT;
330
331 return 0;
332}
333
334
335static void ariadne_init_ring(struct net_device *dev)
336{
337 struct ariadne_private *priv = netdev_priv(dev);
338 volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
339 int i;
340
341 netif_stop_queue(dev);
342
343 priv->tx_full = 0;
344 priv->cur_rx = priv->cur_tx = 0;
345 priv->dirty_tx = 0;
346
347 /* Set up TX Ring */
348 for (i = 0; i < TX_RING_SIZE; i++) {
349 volatile struct TDRE *t = &lancedata->tx_ring[i];
350 t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
351 t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
352 TF_STP | TF_ENP;
353 t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
354 t->TMD3 = 0;
355 priv->tx_ring[i] = &lancedata->tx_ring[i];
356 priv->tx_buff[i] = lancedata->tx_buff[i];
357#if 0
358 printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
359 &lancedata->tx_ring[i], lancedata->tx_buff[i]);
360#endif
361 }
362
363 /* Set up RX Ring */
364 for (i = 0; i < RX_RING_SIZE; i++) {
365 volatile struct RDRE *r = &lancedata->rx_ring[i];
366 r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
367 r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
368 RF_OWN;
369 r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
370 r->RMD3 = 0x0000;
371 priv->rx_ring[i] = &lancedata->rx_ring[i];
372 priv->rx_buff[i] = lancedata->rx_buff[i];
373#if 0
374 printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
375 &lancedata->rx_ring[i], lancedata->rx_buff[i]);
376#endif
377 }
378}
379
380
381static int ariadne_close(struct net_device *dev)
382{
1da177e4
LT		 383 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
384
385 netif_stop_queue(dev);
386
387 lance->RAP = CSR112; /* Missed Frame Count */
038eddd9 388 dev->stats.rx_missed_errors = swapw(lance->RDP);
1da177e4
LT		 389 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
390
391 if (ariadne_debug > 1) {
392 printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
393 dev->name, lance->RDP);
394 printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
038eddd9 395 dev->stats.rx_missed_errors);
1da177e4
LT		 396 }
397
398 /* We stop the LANCE here -- it occasionally polls memory if we don't. */
399 lance->RDP = STOP;
400
401 free_irq(IRQ_AMIGA_PORTS, dev);
402
403 return 0;
404}
405
406
407static inline void ariadne_reset(struct net_device *dev)
408{
409 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
410
411 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
412 lance->RDP = STOP;
413 ariadne_init_ring(dev);
414 lance->RDP = INEA|STRT;
415 netif_start_queue(dev);
416}
417
418
7d12e780 419static irqreturn_t ariadne_interrupt(int irq, void *data)
1da177e4
LT		 420{
421 struct net_device *dev = (struct net_device *)data;
422 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
423 struct ariadne_private *priv;
424 int csr0, boguscnt;
425 int handled = 0;
426
427 if (dev == NULL) {
428 printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
429 return IRQ_NONE;
430 }
431
432 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
433
434 if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
435 return IRQ_NONE; /* generated by the board. */
436
437 priv = netdev_priv(dev);
438
439 boguscnt = 10;
440 while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
441 /* Acknowledge all of the current interrupt sources ASAP. */
442 lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
443
444#if 0
445 if (ariadne_debug > 5) {
446 printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.",
447 dev->name, csr0, lance->RDP);
448 printk("[");
449 if (csr0 & INTR)
450 printk(" INTR");
451 if (csr0 & INEA)
452 printk(" INEA");
453 if (csr0 & RXON)
454 printk(" RXON");
455 if (csr0 & TXON)
456 printk(" TXON");
457 if (csr0 & TDMD)
458 printk(" TDMD");
459 if (csr0 & STOP)
460 printk(" STOP");
461 if (csr0 & STRT)
462 printk(" STRT");
463 if (csr0 & INIT)
464 printk(" INIT");
465 if (csr0 & ERR)
466 printk(" ERR");
467 if (csr0 & BABL)
468 printk(" BABL");
469 if (csr0 & CERR)
470 printk(" CERR");
471 if (csr0 & MISS)
472 printk(" MISS");
473 if (csr0 & MERR)
474 printk(" MERR");
475 if (csr0 & RINT)
476 printk(" RINT");
477 if (csr0 & TINT)
478 printk(" TINT");
479 if (csr0 & IDON)
480 printk(" IDON");
481 printk(" ]\n");
482 }
483#endif
484
485 if (csr0 & RINT) { /* Rx interrupt */
486 handled = 1;
487 ariadne_rx(dev);
488 }
489
490 if (csr0 & TINT) { /* Tx-done interrupt */
491 int dirty_tx = priv->dirty_tx;
492
493 handled = 1;
494 while (dirty_tx < priv->cur_tx) {
495 int entry = dirty_tx % TX_RING_SIZE;
496 int status = lowb(priv->tx_ring[entry]->TMD1);
497
498 if (status & TF_OWN)
499 break; /* It still hasn't been Txed */
500
501 priv->tx_ring[entry]->TMD1 &= 0xff00;
502
503 if (status & TF_ERR) {
504 /* There was an major error, log it. */
505 int err_status = priv->tx_ring[entry]->TMD3;
038eddd9 506 dev->stats.tx_errors++;
1da177e4 507 if (err_status & EF_RTRY)
038eddd9 508 dev->stats.tx_aborted_errors++;
1da177e4 509 if (err_status & EF_LCAR)
038eddd9 510 dev->stats.tx_carrier_errors++;
1da177e4 511 if (err_status & EF_LCOL)
038eddd9 512 dev->stats.tx_window_errors++;
1da177e4
LT		 513 if (err_status & EF_UFLO) {
514 /* Ackk! On FIFO errors the Tx unit is turned off! */
038eddd9 515 dev->stats.tx_fifo_errors++;
1da177e4
LT		 516 /* Remove this verbosity later! */
517 printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
518 dev->name, csr0);
519 /* Restart the chip. */
520 lance->RDP = STRT;
521 }
522 } else {
523 if (status & (TF_MORE|TF_ONE))
038eddd9
PZ		 524 dev->stats.collisions++;
525 dev->stats.tx_packets++;
1da177e4
LT		 526 }
527 dirty_tx++;
528 }
529
530#ifndef final_version
531 if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
532 printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
533 "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
534 dirty_tx += TX_RING_SIZE;
535 }
536#endif
537
538 if (priv->tx_full && netif_queue_stopped(dev) &&
539 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
540 /* The ring is no longer full. */
541 priv->tx_full = 0;
542 netif_wake_queue(dev);
543 }
544
545 priv->dirty_tx = dirty_tx;
546 }
547
548 /* Log misc errors. */
549 if (csr0 & BABL) {
550 handled = 1;
038eddd9 551 dev->stats.tx_errors++; /* Tx babble. */
1da177e4
LT		 552 }
553 if (csr0 & MISS) {
554 handled = 1;
038eddd9 555 dev->stats.rx_errors++; /* Missed a Rx frame. */
1da177e4
LT		 556 }
557 if (csr0 & MERR) {
558 handled = 1;
559 printk(KERN_ERR "%s: Bus master arbitration failure, status "
560 "%4.4x.\n", dev->name, csr0);
561 /* Restart the chip. */
562 lance->RDP = STRT;
563 }
564 }
565
566 /* Clear any other interrupt, and set interrupt enable. */
567 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
568 lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
569
570#if 0
571 if (ariadne_debug > 4)
572 printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
573 lance->RAP, lance->RDP);
574#endif
575 return IRQ_RETVAL(handled);
576}
577
578
579static void ariadne_tx_timeout(struct net_device *dev)
580{
581 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
582
583 printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
584 dev->name, lance->RDP);
585 ariadne_reset(dev);
586 netif_wake_queue(dev);
587}
588
589
61357325
SH		 590static netdev_tx_t ariadne_start_xmit(struct sk_buff *skb,
591 struct net_device *dev)
1da177e4
LT		 592{
593 struct ariadne_private *priv = netdev_priv(dev);
594 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
595 int entry;
596 unsigned long flags;
597 int len = skb->len;
598
599#if 0
600 if (ariadne_debug > 3) {
601 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
602 printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
603 dev->name, lance->RDP);
604 lance->RDP = 0x0000;
605 }
606#endif
607
608 /* FIXME: is the 79C960 new enough to do its own padding right ? */
609 if (skb->len < ETH_ZLEN)
610 {
5b057c6b 611 if (skb_padto(skb, ETH_ZLEN))
6ed10654 612 return NETDEV_TX_OK;
1da177e4
LT		 613 len = ETH_ZLEN;
614 }
615
616 /* Fill in a Tx ring entry */
617
618#if 0
0795af57 619{
e174961c 620 printk(KERN_DEBUG "TX pkt type 0x%04x from %pM to %pM "
0795af57
JP		 621 " data 0x%08x len %d\n",
622 ((u_short *)skb->data)[6],
e174961c 623 skb->data + 6, skb->data,
0795af57
JP		 624 (int)skb->data, (int)skb->len);
625}
1da177e4
LT		 626#endif
627
628 local_irq_save(flags);
629
630 entry = priv->cur_tx % TX_RING_SIZE;
631
632 /* Caution: the write order is important here, set the base address with
633 the "ownership" bits last. */
634
635 priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
636 priv->tx_ring[entry]->TMD3 = 0x0000;
637 memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
638
639#if 0
640 {
641 int i, len;
642
643 len = skb->len > 64 ? 64 : skb->len;
644 len >>= 1;
645 for (i = 0; i < len; i += 8) {
646 int j;
647 printk(KERN_DEBUG "%04x:", i);
648 for (j = 0; (j < 8) && ((i+j) < len); j++) {
649 if (!(j & 1))
650 printk(" ");
651 printk("%04x", priv->tx_buff[entry][i+j]);
652 }
653 printk("\n");
654 }
655 }
656#endif
657
658 priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
659
660 dev_kfree_skb(skb);
661
662 priv->cur_tx++;
663 if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
664
665#if 0
666 printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
667 "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
668#endif
669
670 priv->cur_tx -= TX_RING_SIZE;
671 priv->dirty_tx -= TX_RING_SIZE;
672 }
038eddd9 673 dev->stats.tx_bytes += len;
1da177e4
LT		 674
675 /* Trigger an immediate send poll. */
676 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
677 lance->RDP = INEA|TDMD;
678
1da177e4
LT		 679 if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
680 netif_stop_queue(dev);
681 priv->tx_full = 1;
682 }
683 local_irq_restore(flags);
684
6ed10654 685 return NETDEV_TX_OK;
1da177e4
LT		 686}
687
688
689static int ariadne_rx(struct net_device *dev)
690{
691 struct ariadne_private *priv = netdev_priv(dev);
692 int entry = priv->cur_rx % RX_RING_SIZE;
693 int i;
694
695 /* If we own the next entry, it's a new packet. Send it up. */
696 while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
697 int status = lowb(priv->rx_ring[entry]->RMD1);
698
699 if (status != (RF_STP|RF_ENP)) { /* There was an error. */
700 /* There is a tricky error noted by John Murphy,
701 <murf@perftech.com> to Russ Nelson: Even with full-sized
702 buffers it's possible for a jabber packet to use two
703 buffers, with only the last correctly noting the error. */
704 if (status & RF_ENP)
705 /* Only count a general error at the end of a packet.*/
038eddd9 706 dev->stats.rx_errors++;
1da177e4 707 if (status & RF_FRAM)
038eddd9 708 dev->stats.rx_frame_errors++;
1da177e4 709 if (status & RF_OFLO)
038eddd9 710 dev->stats.rx_over_errors++;
1da177e4 711 if (status & RF_CRC)
038eddd9 712 dev->stats.rx_crc_errors++;
1da177e4 713 if (status & RF_BUFF)
038eddd9 714 dev->stats.rx_fifo_errors++;
1da177e4
LT		 715 priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
716 } else {
717 /* Malloc up new buffer, compatible with net-3. */
718 short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
719 struct sk_buff *skb;
720
721 skb = dev_alloc_skb(pkt_len+2);
722 if (skb == NULL) {
723 printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
724 dev->name);
725 for (i = 0; i < RX_RING_SIZE; i++)
726 if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
727 break;
728
729 if (i > RX_RING_SIZE-2) {
038eddd9 730 dev->stats.rx_dropped++;
1da177e4
LT		 731 priv->rx_ring[entry]->RMD1 |= RF_OWN;
732 priv->cur_rx++;
733 }
734 break;
735 }
736
737
1da177e4
LT		 738 skb_reserve(skb,2); /* 16 byte align */
739 skb_put(skb,pkt_len); /* Make room */
8c7b7faa 740 skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
1da177e4
LT		 741 skb->protocol=eth_type_trans(skb,dev);
742#if 0
0795af57 743{
1da177e4
LT		 744 printk(KERN_DEBUG "RX pkt type 0x%04x from ",
745 ((u_short *)skb->data)[6]);
746 {
1da177e4 747 u_char *ptr = &((u_char *)skb->data)[6];
e174961c 748 printk("%pM", ptr);
1da177e4
LT		 749 }
750 printk(" to ");
751 {
1da177e4 752 u_char *ptr = (u_char *)skb->data;
e174961c 753 printk("%pM", ptr);
1da177e4
LT		 754 }
755 printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
0795af57 756}
1da177e4
LT		 757#endif
758
759 netif_rx(skb);
038eddd9
PZ		 760 dev->stats.rx_packets++;
761 dev->stats.rx_bytes += pkt_len;
1da177e4
LT		 762 }
763
764 priv->rx_ring[entry]->RMD1 |= RF_OWN;
765 entry = (++priv->cur_rx) % RX_RING_SIZE;
766 }
767
768 priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
769
770 /* We should check that at least two ring entries are free. If not,
771 we should free one and mark stats->rx_dropped++. */
772
773 return 0;
774}
775
776
777static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
778{
1da177e4
LT		 779 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
780 short saved_addr;
781 unsigned long flags;
782
783 local_irq_save(flags);
784 saved_addr = lance->RAP;
785 lance->RAP = CSR112; /* Missed Frame Count */
038eddd9 786 dev->stats.rx_missed_errors = swapw(lance->RDP);
1da177e4
LT		 787 lance->RAP = saved_addr;
788 local_irq_restore(flags);
789
038eddd9 790 return &dev->stats;
1da177e4
LT		 791}
792
793
794/* Set or clear the multicast filter for this adaptor.
795 num_addrs == -1 Promiscuous mode, receive all packets
796 num_addrs == 0 Normal mode, clear multicast list
797 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
798 best-effort filtering.
799 */
800static void set_multicast_list(struct net_device *dev)
801{
802 volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
803
804 if (!netif_running(dev))
805 return;
806
807 netif_stop_queue(dev);
808
809 /* We take the simple way out and always enable promiscuous mode. */
810 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
811 lance->RDP = STOP; /* Temporarily stop the lance. */
812 ariadne_init_ring(dev);
813
814 if (dev->flags & IFF_PROMISC) {
1da177e4
LT		 815 lance->RAP = CSR15; /* Mode Register */
816 lance->RDP = PROM; /* Set promiscuous mode */
817 } else {
818 short multicast_table[4];
4cd24eaf 819 int num_addrs = netdev_mc_count(dev);
1da177e4
LT		 820 int i;
821 /* We don't use the multicast table, but rely on upper-layer filtering. */
822 memset(multicast_table, (num_addrs == 0) ? 0 : -1,
823 sizeof(multicast_table));
824 for (i = 0; i < 4; i++) {
825 lance->RAP = CSR8+(i<<8); /* Logical Address Filter */
826 lance->RDP = swapw(multicast_table[i]);
827 }
828 lance->RAP = CSR15; /* Mode Register */
829 lance->RDP = 0x0000; /* Unset promiscuous mode */
830 }
831
832 lance->RAP = CSR0; /* PCnet-ISA Controller Status */
833 lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */
834
835 netif_wake_queue(dev);
836}
837
838
839static void __devexit ariadne_remove_one(struct zorro_dev *z)
840{
841 struct net_device *dev = zorro_get_drvdata(z);
842
843 unregister_netdev(dev);
844 release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
845 release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
846 free_netdev(dev);
847}
848
849static int __init ariadne_init_module(void)
850{
33d8675e 851 return zorro_register_driver(&ariadne_driver);
1da177e4
LT		 852}
853
854static void __exit ariadne_cleanup_module(void)
855{
856 zorro_unregister_driver(&ariadne_driver);
857}
858
859module_init(ariadne_init_module);
860module_exit(ariadne_cleanup_module);
861
862MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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