67e96ae85035638ee009f2aadac0e5a7a538269b
[linux-2.6.git] / drivers / net / arm / ether3.c
1 /*
2  *  linux/drivers/acorn/net/ether3.c
3  *
4  *  Copyright (C) 1995-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
11  *  for Acorn machines
12  *
13  * By Russell King, with some suggestions from borris@ant.co.uk
14  *
15  * Changelog:
16  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
17  *                              address up to the higher levels - they're
18  *                              silently ignored.  I/F can now be put into
19  *                              multicast mode.  Receiver routine optimised.
20  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
21  *                              the kernel rather than when a module.
22  * 1.06 RMK     02/03/1996      Various code cleanups
23  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
24  *                              routines.
25  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
26  *                              prevented the kernel message about dropped
27  *                              packets appearing too many times a second.
28  *                              Now does not disable all IRQs, only the IRQ
29  *                              used by this card.
30  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
31  *                              but we still service the TX queue if we get a
32  *                              RX interrupt.
33  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
34  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
35  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
36  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
37  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
38  *                              Chip seems to have a bug in, whereby if the
39  *                              packet starts two bytes from the end of the
40  *                              buffer, it corrupts the receiver chain, and
41  *                              never updates the transmit status correctly.
42  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
43  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
44  *                              hardware.
45  * 1.16 RMK     10/02/2000      Updated for 2.3.43
46  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
47  */
48
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/fcntl.h>
53 #include <linux/interrupt.h>
54 #include <linux/ioport.h>
55 #include <linux/in.h>
56 #include <linux/slab.h>
57 #include <linux/string.h>
58 #include <linux/errno.h>
59 #include <linux/netdevice.h>
60 #include <linux/etherdevice.h>
61 #include <linux/skbuff.h>
62 #include <linux/device.h>
63 #include <linux/init.h>
64 #include <linux/delay.h>
65 #include <linux/bitops.h>
66
67 #include <asm/system.h>
68 #include <asm/ecard.h>
69 #include <asm/io.h>
70
71 static char version[] __devinitdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
72
73 #include "ether3.h"
74
75 static unsigned int net_debug = NET_DEBUG;
76
77 static void     ether3_setmulticastlist(struct net_device *dev);
78 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
79 static void     ether3_tx(struct net_device *dev);
80 static int      ether3_open (struct net_device *dev);
81 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
82 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
83 static int      ether3_close (struct net_device *dev);
84 static struct net_device_stats *ether3_getstats (struct net_device *dev);
85 static void     ether3_setmulticastlist (struct net_device *dev);
86 static void     ether3_timeout(struct net_device *dev);
87
88 #define BUS_16          2
89 #define BUS_8           1
90 #define BUS_UNKNOWN     0
91
92 /* --------------------------------------------------------------------------- */
93
94 typedef enum {
95         buffer_write,
96         buffer_read
97 } buffer_rw_t;
98
99 /*
100  * ether3 read/write.  Slow things down a bit...
101  * The SEEQ8005 doesn't like us writing to its registers
102  * too quickly.
103  */
104 static inline void ether3_outb(int v, const void __iomem *r)
105 {
106         writeb(v, r);
107         udelay(1);
108 }
109
110 static inline void ether3_outw(int v, const void __iomem *r)
111 {
112         writew(v, r);
113         udelay(1);
114 }
115 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
116 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
117
118 static int
119 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
120 {
121         int timeout = 1000;
122
123         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
124         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
125
126         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
127                 if (!timeout--) {
128                         printk("%s: setbuffer broken\n", dev->name);
129                         priv(dev)->broken = 1;
130                         return 1;
131                 }
132                 udelay(1);
133         }
134
135         if (read == buffer_read) {
136                 ether3_outw(start, REG_DMAADDR);
137                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
138         } else {
139                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
140                 ether3_outw(start, REG_DMAADDR);
141         }
142         return 0;
143 }
144
145 /*
146  * write data to the buffer memory
147  */
148 #define ether3_writebuffer(dev,data,length)                     \
149         writesw(REG_BUFWIN, (data), (length) >> 1)
150
151 #define ether3_writeword(dev,data)                              \
152         writew((data), REG_BUFWIN)
153
154 #define ether3_writelong(dev,data)      {                       \
155         void __iomem *reg_bufwin = REG_BUFWIN;                  \
156         writew((data), reg_bufwin);                             \
157         writew((data) >> 16, reg_bufwin);                       \
158 }
159
160 /*
161  * read data from the buffer memory
162  */
163 #define ether3_readbuffer(dev,data,length)                      \
164         readsw(REG_BUFWIN, (data), (length) >> 1)
165
166 #define ether3_readword(dev)                                    \
167         readw(REG_BUFWIN)
168
169 #define ether3_readlong(dev)                                    \
170         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
171
172 /*
173  * Switch LED off...
174  */
175 static void ether3_ledoff(unsigned long data)
176 {
177         struct net_device *dev = (struct net_device *)data;
178         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
179 }
180
181 /*
182  * switch LED on...
183  */
184 static inline void ether3_ledon(struct net_device *dev)
185 {
186         del_timer(&priv(dev)->timer);
187         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
188         priv(dev)->timer.data = (unsigned long)dev;
189         priv(dev)->timer.function = ether3_ledoff;
190         add_timer(&priv(dev)->timer);
191         if (priv(dev)->regs.config2 & CFG2_CTRLO)
192                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
193 }
194
195 /*
196  * Read the ethernet address string from the on board rom.
197  * This is an ascii string!!!
198  */
199 static int __devinit
200 ether3_addr(char *addr, struct expansion_card *ec)
201 {
202         struct in_chunk_dir cd;
203         char *s;
204         
205         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
206                 int i;
207                 for (i = 0; i<6; i++) {
208                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
209                         if (*s != (i==5?')' : ':' ))
210                                 break;
211                 }
212                 if (i == 6)
213                         return 0;
214         }
215         /* I wonder if we should even let the user continue in this case
216          *   - no, it would be better to disable the device
217          */
218         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
219         return -ENODEV;
220 }
221
222 /* --------------------------------------------------------------------------- */
223
224 static int __devinit
225 ether3_ramtest(struct net_device *dev, unsigned char byte)
226 {
227         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
228         int i,ret = 0;
229         int max_errors = 4;
230         int bad = -1;
231
232         if (!buffer)
233                 return 1;
234
235         memset(buffer, byte, RX_END);
236         ether3_setbuffer(dev, buffer_write, 0);
237         ether3_writebuffer(dev, buffer, TX_END);
238         ether3_setbuffer(dev, buffer_write, RX_START);
239         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
240         memset(buffer, byte ^ 0xff, RX_END);
241         ether3_setbuffer(dev, buffer_read, 0);
242         ether3_readbuffer(dev, buffer, TX_END);
243         ether3_setbuffer(dev, buffer_read, RX_START);
244         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
245
246         for (i = 0; i < RX_END; i++) {
247                 if (buffer[i] != byte) {
248                         if (max_errors > 0 && bad != buffer[i]) {
249                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
250                                        dev->name, buffer[i], byte, i);
251                                 ret = 2;
252                                 max_errors--;
253                                 bad = i;
254                         }
255                 } else {
256                         if (bad != -1) {
257                                 if (bad != i - 1)
258                                         printk(" - 0x%04X\n", i - 1);
259                                 printk("\n");
260                                 bad = -1;
261                         }
262                 }
263         }
264         if (bad != -1)
265                 printk(" - 0xffff\n");
266         kfree(buffer);
267
268         return ret;
269 }
270
271 /* ------------------------------------------------------------------------------- */
272
273 static int __devinit ether3_init_2(struct net_device *dev)
274 {
275         int i;
276
277         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
278         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
279         priv(dev)->regs.command = 0;
280
281         /*
282          * Set up our hardware address
283          */
284         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
285         for (i = 0; i < 6; i++)
286                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
287
288         if (dev->flags & IFF_PROMISC)
289                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
290         else if (dev->flags & IFF_MULTICAST)
291                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
292         else
293                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
294
295         /*
296          * There is a problem with the NQ8005 in that it occasionally loses the
297          * last two bytes.  To get round this problem, we receive the CRC as
298          * well.  That way, if we do lose the last two, then it doesn't matter.
299          */
300         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
301         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
302         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
303         ether3_outw(0, REG_TRANSMITPTR);
304         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
305         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
306         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
307         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
308
309         i = ether3_ramtest(dev, 0x5A);
310         if(i)
311                 return i;
312         i = ether3_ramtest(dev, 0x1E);
313         if(i)
314                 return i;
315
316         ether3_setbuffer(dev, buffer_write, 0);
317         ether3_writelong(dev, 0);
318         return 0;
319 }
320
321 static void
322 ether3_init_for_open(struct net_device *dev)
323 {
324         int i;
325
326         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
327
328         /* Reset the chip */
329         ether3_outw(CFG2_RESET, REG_CONFIG2);
330         udelay(4);
331
332         priv(dev)->regs.command = 0;
333         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
334         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
335                 barrier();
336
337         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
338         for (i = 0; i < 6; i++)
339                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
340
341         priv(dev)->tx_head      = 0;
342         priv(dev)->tx_tail      = 0;
343         priv(dev)->regs.config2 |= CFG2_CTRLO;
344         priv(dev)->rx_head      = RX_START;
345
346         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
347         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
348         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
349         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
350         ether3_outw(0, REG_TRANSMITPTR);
351         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
352         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
353
354         ether3_setbuffer(dev, buffer_write, 0);
355         ether3_writelong(dev, 0);
356
357         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
358         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
359 }
360
361 static inline int
362 ether3_probe_bus_8(struct net_device *dev, int val)
363 {
364         int write_low, write_high, read_low, read_high;
365
366         write_low = val & 255;
367         write_high = val >> 8;
368
369         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
370
371         ether3_outb(write_low, REG_RECVPTR);
372         ether3_outb(write_high, REG_RECVPTR + 4);
373
374         read_low = ether3_inb(REG_RECVPTR);
375         read_high = ether3_inb(REG_RECVPTR + 4);
376
377         printk(", read8 [%02X:%02X]\n", read_high, read_low);
378
379         return read_low == write_low && read_high == write_high;
380 }
381
382 static inline int
383 ether3_probe_bus_16(struct net_device *dev, int val)
384 {
385         int read_val;
386
387         ether3_outw(val, REG_RECVPTR);
388         read_val = ether3_inw(REG_RECVPTR);
389
390         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
391
392         return read_val == val;
393 }
394
395 /*
396  * Open/initialize the board.  This is called (in the current kernel)
397  * sometime after booting when the 'ifconfig' program is run.
398  *
399  * This routine should set everything up anew at each open, even
400  * registers that "should" only need to be set once at boot, so that
401  * there is non-reboot way to recover if something goes wrong.
402  */
403 static int
404 ether3_open(struct net_device *dev)
405 {
406         if (!is_valid_ether_addr(dev->dev_addr)) {
407                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
408                         dev->name);
409                 return -EINVAL;
410         }
411
412         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
413                 return -EAGAIN;
414
415         ether3_init_for_open(dev);
416
417         netif_start_queue(dev);
418
419         return 0;
420 }
421
422 /*
423  * The inverse routine to ether3_open().
424  */
425 static int
426 ether3_close(struct net_device *dev)
427 {
428         netif_stop_queue(dev);
429
430         disable_irq(dev->irq);
431
432         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
433         priv(dev)->regs.command = 0;
434         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
435                 barrier();
436         ether3_outb(0x80, REG_CONFIG2 + 4);
437         ether3_outw(0, REG_COMMAND);
438
439         free_irq(dev->irq, dev);
440
441         return 0;
442 }
443
444 /*
445  * Get the current statistics.  This may be called with the card open or
446  * closed.
447  */
448 static struct net_device_stats *ether3_getstats(struct net_device *dev)
449 {
450         return &priv(dev)->stats;
451 }
452
453 /*
454  * Set or clear promiscuous/multicast mode filter for this adaptor.
455  *
456  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
457  * in which does not have the other ethernet address registers present...
458  */
459 static void ether3_setmulticastlist(struct net_device *dev)
460 {
461         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
462
463         if (dev->flags & IFF_PROMISC) {
464                 /* promiscuous mode */
465                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
466         } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
467                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
468         } else
469                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
470
471         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
472 }
473
474 static void ether3_timeout(struct net_device *dev)
475 {
476         unsigned long flags;
477
478         del_timer(&priv(dev)->timer);
479
480         local_irq_save(flags);
481         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
482         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
483                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
484         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
485                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
486         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
487                 priv(dev)->tx_head, priv(dev)->tx_tail);
488         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
489         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
490         local_irq_restore(flags);
491
492         priv(dev)->regs.config2 |= CFG2_CTRLO;
493         priv(dev)->stats.tx_errors += 1;
494         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
495         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
496
497         netif_wake_queue(dev);
498 }
499
500 /*
501  * Transmit a packet
502  */
503 static int
504 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
505 {
506         unsigned long flags;
507         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
508         unsigned int ptr, next_ptr;
509
510         if (priv(dev)->broken) {
511                 dev_kfree_skb(skb);
512                 priv(dev)->stats.tx_dropped ++;
513                 netif_start_queue(dev);
514                 return 0;
515         }
516
517         length = (length + 1) & ~1;
518         if (length != skb->len) {
519                 if (skb_padto(skb, length))
520                         goto out;
521         }
522
523         next_ptr = (priv(dev)->tx_head + 1) & 15;
524
525         local_irq_save(flags);
526
527         if (priv(dev)->tx_tail == next_ptr) {
528                 local_irq_restore(flags);
529                 return 1;       /* unable to queue */
530         }
531
532         dev->trans_start = jiffies;
533         ptr              = 0x600 * priv(dev)->tx_head;
534         priv(dev)->tx_head = next_ptr;
535         next_ptr        *= 0x600;
536
537 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
538
539         ether3_setbuffer(dev, buffer_write, next_ptr);
540         ether3_writelong(dev, 0);
541         ether3_setbuffer(dev, buffer_write, ptr);
542         ether3_writelong(dev, 0);
543         ether3_writebuffer(dev, skb->data, length);
544         ether3_writeword(dev, htons(next_ptr));
545         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
546         ether3_setbuffer(dev, buffer_write, ptr);
547         ether3_writeword(dev, htons((ptr + length + 4)));
548         ether3_writeword(dev, TXHDR_FLAGS >> 16);
549         ether3_ledon(dev);
550
551         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
552                 ether3_outw(ptr, REG_TRANSMITPTR);
553                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
554         }
555
556         next_ptr = (priv(dev)->tx_head + 1) & 15;
557         local_irq_restore(flags);
558
559         dev_kfree_skb(skb);
560
561         if (priv(dev)->tx_tail == next_ptr)
562                 netif_stop_queue(dev);
563
564  out:
565         return 0;
566 }
567
568 static irqreturn_t
569 ether3_interrupt(int irq, void *dev_id)
570 {
571         struct net_device *dev = (struct net_device *)dev_id;
572         unsigned int status, handled = IRQ_NONE;
573
574 #if NET_DEBUG > 1
575         if(net_debug & DEBUG_INT)
576                 printk("eth3irq: %d ", irq);
577 #endif
578
579         status = ether3_inw(REG_STATUS);
580
581         if (status & STAT_INTRX) {
582                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
583                 ether3_rx(dev, 12);
584                 handled = IRQ_HANDLED;
585         }
586
587         if (status & STAT_INTTX) {
588                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
589                 ether3_tx(dev);
590                 handled = IRQ_HANDLED;
591         }
592
593 #if NET_DEBUG > 1
594         if(net_debug & DEBUG_INT)
595                 printk("done\n");
596 #endif
597         return handled;
598 }
599
600 /*
601  * If we have a good packet(s), get it/them out of the buffers.
602  */
603 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
604 {
605         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
606
607         ether3_ledon(dev);
608
609         do {
610                 unsigned int this_ptr, status;
611                 unsigned char addrs[16];
612
613                 /*
614                  * read the first 16 bytes from the buffer.
615                  * This contains the status bytes etc and ethernet addresses,
616                  * and we also check the source ethernet address to see if
617                  * it originated from us.
618                  */
619                 {
620                         unsigned int temp_ptr;
621                         ether3_setbuffer(dev, buffer_read, next_ptr);
622                         temp_ptr = ether3_readword(dev);
623                         status = ether3_readword(dev);
624                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
625                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
626                                 break;
627
628                         this_ptr = next_ptr + 4;
629                         next_ptr = ntohs(temp_ptr);
630                 }
631                 ether3_setbuffer(dev, buffer_read, this_ptr);
632                 ether3_readbuffer(dev, addrs+2, 12);
633
634 if (next_ptr < RX_START || next_ptr >= RX_END) {
635  int i;
636  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
637  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
638  for (i = 2; i < 14; i++)
639    printk("%02X ", addrs[i]);
640  printk("\n");
641  next_ptr = priv(dev)->rx_head;
642  break;
643 }
644                 /*
645                  * ignore our own packets...
646                  */
647                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
648                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
649                         maxcnt ++; /* compensate for loopedback packet */
650                         ether3_outw(next_ptr >> 8, REG_RECVEND);
651                 } else
652                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
653                         unsigned int length = next_ptr - this_ptr;
654                         struct sk_buff *skb;
655
656                         if (next_ptr <= this_ptr)
657                                 length += RX_END - RX_START;
658
659                         skb = dev_alloc_skb(length + 2);
660                         if (skb) {
661                                 unsigned char *buf;
662
663                                 skb_reserve(skb, 2);
664                                 buf = skb_put(skb, length);
665                                 ether3_readbuffer(dev, buf + 12, length - 12);
666                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
667                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
668                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
669                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
670                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
671                                 skb->protocol = eth_type_trans(skb, dev);
672                                 netif_rx(skb);
673                                 received ++;
674                         } else
675                                 goto dropping;
676                 } else {
677                         struct net_device_stats *stats = &priv(dev)->stats;
678                         ether3_outw(next_ptr >> 8, REG_RECVEND);
679                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
680                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
681                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
682                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
683                         stats->rx_errors++;
684                 }
685         }
686         while (-- maxcnt);
687
688 done:
689         priv(dev)->stats.rx_packets += received;
690         priv(dev)->rx_head = next_ptr;
691         /*
692          * If rx went off line, then that means that the buffer may be full.  We
693          * have dropped at least one packet.
694          */
695         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
696                 priv(dev)->stats.rx_dropped ++;
697                 ether3_outw(next_ptr, REG_RECVPTR);
698                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
699         }
700
701         return maxcnt;
702
703 dropping:{
704         static unsigned long last_warned;
705
706         ether3_outw(next_ptr >> 8, REG_RECVEND);
707         /*
708          * Don't print this message too many times...
709          */
710         if (time_after(jiffies, last_warned + 10 * HZ)) {
711                 last_warned = jiffies;
712                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
713         }
714         priv(dev)->stats.rx_dropped ++;
715         goto done;
716         }
717 }
718
719 /*
720  * Update stats for the transmitted packet(s)
721  */
722 static void ether3_tx(struct net_device *dev)
723 {
724         unsigned int tx_tail = priv(dev)->tx_tail;
725         int max_work = 14;
726
727         do {
728                 unsigned long status;
729
730                 /*
731                  * Read the packet header
732                  */
733                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
734                 status = ether3_readlong(dev);
735
736                 /*
737                  * Check to see if this packet has been transmitted
738                  */
739                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
740                     (TXSTAT_DONE | TXHDR_TRANSMIT))
741                         break;
742
743                 /*
744                  * Update errors
745                  */
746                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
747                         priv(dev)->stats.tx_packets++;
748                 else {
749                         priv(dev)->stats.tx_errors ++;
750                         if (status & TXSTAT_16COLLISIONS)
751                                 priv(dev)->stats.collisions += 16;
752                         if (status & TXSTAT_BABBLED)
753                                 priv(dev)->stats.tx_fifo_errors ++;
754                 }
755
756                 tx_tail = (tx_tail + 1) & 15;
757         } while (--max_work);
758
759         if (priv(dev)->tx_tail != tx_tail) {
760                 priv(dev)->tx_tail = tx_tail;
761                 netif_wake_queue(dev);
762         }
763 }
764
765 static void __devinit ether3_banner(void)
766 {
767         static unsigned version_printed = 0;
768
769         if (net_debug && version_printed++ == 0)
770                 printk(KERN_INFO "%s", version);
771 }
772
773 static int __devinit
774 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
775 {
776         const struct ether3_data *data = id->data;
777         struct net_device *dev;
778         int bus_type, ret;
779         DECLARE_MAC_BUF(mac);
780
781         ether3_banner();
782
783         ret = ecard_request_resources(ec);
784         if (ret)
785                 goto out;
786
787         dev = alloc_etherdev(sizeof(struct dev_priv));
788         if (!dev) {
789                 ret = -ENOMEM;
790                 goto release;
791         }
792
793         SET_NETDEV_DEV(dev, &ec->dev);
794
795         priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
796         if (!priv(dev)->base) {
797                 ret = -ENOMEM;
798                 goto free;
799         }
800
801         ec->irqaddr = priv(dev)->base + data->base_offset;
802         ec->irqmask = 0xf0;
803
804         priv(dev)->seeq = priv(dev)->base + data->base_offset;
805         dev->irq = ec->irq;
806
807         ether3_addr(dev->dev_addr, ec);
808
809         init_timer(&priv(dev)->timer);
810
811         /* Reset card...
812          */
813         ether3_outb(0x80, REG_CONFIG2 + 4);
814         bus_type = BUS_UNKNOWN;
815         udelay(4);
816
817         /* Test using Receive Pointer (16-bit register) to find out
818          * how the ether3 is connected to the bus...
819          */
820         if (ether3_probe_bus_8(dev, 0x100) &&
821             ether3_probe_bus_8(dev, 0x201))
822                 bus_type = BUS_8;
823
824         if (bus_type == BUS_UNKNOWN &&
825             ether3_probe_bus_16(dev, 0x101) &&
826             ether3_probe_bus_16(dev, 0x201))
827                 bus_type = BUS_16;
828
829         switch (bus_type) {
830         case BUS_UNKNOWN:
831                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
832                 ret = -ENODEV;
833                 goto free;
834
835         case BUS_8:
836                 printk(KERN_ERR "%s: %s found, but is an unsupported "
837                         "8-bit card\n", dev->name, data->name);
838                 ret = -ENODEV;
839                 goto free;
840
841         default:
842                 break;
843         }
844
845         if (ether3_init_2(dev)) {
846                 ret = -ENODEV;
847                 goto free;
848         }
849
850         dev->open               = ether3_open;
851         dev->stop               = ether3_close;
852         dev->hard_start_xmit    = ether3_sendpacket;
853         dev->get_stats          = ether3_getstats;
854         dev->set_multicast_list = ether3_setmulticastlist;
855         dev->tx_timeout         = ether3_timeout;
856         dev->watchdog_timeo     = 5 * HZ / 100;
857
858         ret = register_netdev(dev);
859         if (ret)
860                 goto free;
861
862         printk("%s: %s in slot %d, %s\n",
863                dev->name, data->name, ec->slot_no, print_mac(mac, dev->dev_addr));
864
865         ecard_set_drvdata(ec, dev);
866         return 0;
867
868  free:
869         free_netdev(dev);
870  release:
871         ecard_release_resources(ec);
872  out:
873         return ret;
874 }
875
876 static void __devexit ether3_remove(struct expansion_card *ec)
877 {
878         struct net_device *dev = ecard_get_drvdata(ec);
879
880         ecard_set_drvdata(ec, NULL);
881
882         unregister_netdev(dev);
883         free_netdev(dev);
884         ecard_release_resources(ec);
885 }
886
887 static struct ether3_data ether3 = {
888         .name           = "ether3",
889         .base_offset    = 0,
890 };
891
892 static struct ether3_data etherb = {
893         .name           = "etherb",
894         .base_offset    = 0x800,
895 };
896
897 static const struct ecard_id ether3_ids[] = {
898         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
899         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
900         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
901         { 0xffff, 0xffff }
902 };
903
904 static struct ecard_driver ether3_driver = {
905         .probe          = ether3_probe,
906         .remove         = __devexit_p(ether3_remove),
907         .id_table       = ether3_ids,
908         .drv = {
909                 .name   = "ether3",
910         },
911 };
912
913 static int __init ether3_init(void)
914 {
915         return ecard_register_driver(&ether3_driver);
916 }
917
918 static void __exit ether3_exit(void)
919 {
920         ecard_remove_driver(&ether3_driver);
921 }
922
923 module_init(ether3_init);
924 module_exit(ether3_exit);
925
926 MODULE_LICENSE("GPL");