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*/
1 /*
2 * de620.c $Revision: 1.40 $ BETA
3 *
4 *
5 * Linux driver for the D-Link DE-620 Ethernet pocket adapter.
6 *
7 * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se>
8 *
9 * Based on adapter information gathered from DOS packetdriver
10 * sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.)
11 * Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992
12 * Copyright, 1988, Russell Nelson, Crynwr Software
13 *
14 * Adapted to the sample network driver core for linux,
15 * written by: Donald Becker <becker@super.org>
16 * (Now at <becker@cesdis.gsfc.nasa.gov>
17 *
18 * Valuable assistance from:
19 * J. Joshua Kopper <kopper@rtsg.mot.com>
20 * Olav Kvittem <Olav.Kvittem@uninett.no>
21 * Germano Caronni <caronni@nessie.cs.id.ethz.ch>
22 * Jeremy Fitzhardinge <jeremy@suite.sw.oz.au>
23 *
24 *****************************************************************************/
25 /*
26 * This program is free software; you can redistribute it and/or modify
27 * it under the terms of the GNU General Public License as published by
28 * the Free Software Foundation; either version 2, or (at your option)
29 * any later version.
30 *
31 * This program is distributed in the hope that it will be useful,
32 * but WITHOUT ANY WARRANTY; without even the implied warranty of
33 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
34 * GNU General Public License for more details.
35 *
36 * You should have received a copy of the GNU General Public License
37 * along with this program; if not, write to the Free Software
38 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
39 *
40 *****************************************************************************/
41 static const char *version =
42 "de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n";
43
44 /***********************************************************************
45 *
46 * "Tuning" section.
47 *
48 * Compile-time options: (see below for descriptions)
49 * -DDE620_IO=0x378 (lpt1)
50 * -DDE620_IRQ=7 (lpt1)
51 * -DDE602_DEBUG=...
52 * -DSHUTDOWN_WHEN_LOST
53 * -DCOUNT_LOOPS
54 * -DLOWSPEED
55 * -DREAD_DELAY
56 * -DWRITE_DELAY
57 */
58
59 /*
60 * This driver assumes that the printer port is a "normal",
61 * dumb, uni-directional port!
62 * If your port is "fancy" in any way, please try to set it to "normal"
63 * with your BIOS setup. I have no access to machines with bi-directional
64 * ports, so I can't test such a driver :-(
65 * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
66 *
67 * There are some clones of DE620 out there, with different names.
68 * If the current driver does not recognize a clone, try to change
69 * the following #define to:
70 *
71 * #define DE620_CLONE 1
72 */
73 #define DE620_CLONE 0
74
75 /*
76 * If the adapter has problems with high speeds, enable this #define
77 * otherwise full printerport speed will be attempted.
78 *
79 * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
80 *
81 #define LOWSPEED
82 */
83
84 #ifndef READ_DELAY
85 #define READ_DELAY 100 /* adapter internal read delay in 100ns units */
86 #endif
87
88 #ifndef WRITE_DELAY
89 #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */
90 #endif
91
92 /*
93 * Enable this #define if you want the adapter to do a "ifconfig down" on
94 * itself when we have detected that something is possibly wrong with it.
95 * The default behaviour is to retry with "adapter_init()" until success.
96 * This should be used for debugging purposes only.
97 *
98 #define SHUTDOWN_WHEN_LOST
99 */
100
101 /*
102 * Enable debugging by "-DDE620_DEBUG=3" when compiling,
103 * OR in "./CONFIG"
104 * OR by enabling the following #define
105 *
106 * use 0 for production, 1 for verification, >2 for debug
107 *
108 #define DE620_DEBUG 3
109 */
110
111 #ifdef LOWSPEED
112 /*
113 * Enable this #define if you want to see debugging output that show how long
114 * we have to wait before the DE-620 is ready for the next read/write/command.
115 *
116 #define COUNT_LOOPS
117 */
118 #endif
119
120 #include <linux/module.h>
121
122 #include <linux/kernel.h>
123 #include <linux/sched.h>
124 #include <linux/types.h>
125 #include <linux/fcntl.h>
126 #include <linux/string.h>
127 #include <linux/interrupt.h>
128 #include <linux/ioport.h>
129 #include <asm/io.h>
130 #include <linux/in.h>
131 #include <linux/ptrace.h>
132 #include <asm/system.h>
133 #include <linux/errno.h>
134
135 #include <linux/inet.h>
136 #include <linux/netdevice.h>
137 #include <linux/etherdevice.h>
138 #include <linux/skbuff.h>
139
140 /* Constant definitions for the DE-620 registers, commands and bits */
141 #include "de620.h"
142
143 #define netstats enet_statistics
144 typedef unsigned char byte;
145
146 /*******************************************************
147 * *
148 * Definition of D-Link DE-620 Ethernet Pocket adapter *
149 * See also "de620.h" *
150 * *
151 *******************************************************/
152 #ifndef DE620_IO /* Compile-time configurable */
153 #define DE620_IO 0x378
154 #endif
155
156 #ifndef DE620_IRQ /* Compile-time configurable */
157 #define DE620_IRQ 7
158 #endif
159
160 #define DATA_PORT (dev->base_addr)
161 #define STATUS_PORT (dev->base_addr + 1)
162 #define COMMAND_PORT (dev->base_addr + 2)
163
164 #define RUNT 60 /* Too small Ethernet packet */
165 #define GIANT 1514 /* largest legal size packet, no fcs */
166
167 #ifdef DE620_DEBUG /* Compile-time configurable */
168 #define PRINTK(x) if (de620_debug >= 2) printk x
169 #else
170 #define DE620_DEBUG 0
171 #define PRINTK(x) /**/
172 #endif
173
174
175 /*
176 * Force media with insmod:
177 * insmod de620.o bnc=1
178 * or
179 * insmod de620.o utp=1
180 *
181 * Force io and/or irq with insmod:
182 * insmod de620.o io=0x378 irq=7
183 *
184 * Make a clone skip the Ethernet-address range check:
185 * insmod de620.o clone=1
186 */
187 static int bnc = 0;
188 static int utp = 0;
189 static int io = DE620_IO;
190 static int irq = DE620_IRQ;
191 static int clone = DE620_CLONE;
192
193 static unsigned int de620_debug = DE620_DEBUG;
194
195 /***********************************************
196 * *
197 * Index to functions, as function prototypes. *
198 * *
199 ***********************************************/
200
201 /*
202 * Routines used internally. (See also "convenience macros.. below")
203 */
204
205 /* Put in the device structure. */
206 static int de620_open(struct device *);
207 static int de620_close(struct device *);
208 static struct netstats *get_stats(struct device *);
209 static void de620_set_multicast_list(struct device *, int, void *);
210 static int de620_start_xmit(struct sk_buff *, struct device *);
211
212 /* Dispatch from interrupts. */
213 static void de620_interrupt(int, struct pt_regs *);
214 static int de620_rx_intr(struct device *);
215
216 /* Initialization */
217 static int adapter_init(struct device *);
218 int de620_probe(struct device *);
219 static int read_eeprom(struct device *);
220
221
222 /*
223 * D-Link driver variables:
224 */
225 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
226 #define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */
227 #define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */
228 #define DEF_NIC_CMD IRQEN | ICEN | DS1
229
230 static volatile byte NIC_Cmd;
231 static volatile byte next_rx_page;
232 static byte first_rx_page;
233 static byte last_rx_page;
234 static byte EIPRegister;
235
236 static struct nic {
237 byte NodeID[6];
238 byte RAM_Size;
239 byte Model;
240 byte Media;
241 byte SCR;
242 } nic_data;
243
244 /**********************************************************
245 * *
246 * Convenience macros/functions for D-Link DE-620 adapter *
247 * *
248 **********************************************************/
249 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
250 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
251
252 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
253 #ifdef COUNT_LOOPS
254 static int tot_cnt;
255 #endif
256 static inline byte
257 de620_ready(struct device *dev)
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*/
258 {
259 byte value;
260 register short int cnt = 0;
261
262 while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
263 ++cnt;
264
265 #ifdef COUNT_LOOPS
266 tot_cnt += cnt;
267 #endif
268 return value & 0xf0; /* nibble */
269 }
270
271 static inline void
272 de620_send_command(struct device *dev, byte cmd)
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*/
273 {
274 de620_ready(dev);
275 if (cmd == W_DUMMY)
276 outb(NIC_Cmd, COMMAND_PORT);
277
278 outb(cmd, DATA_PORT);
279
280 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
281 de620_ready(dev);
282 outb(NIC_Cmd, COMMAND_PORT);
283 }
284
285 static inline void
286 de620_put_byte(struct device *dev, byte value)
/* */
287 {
288 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
289 de620_ready(dev);
290 outb(value, DATA_PORT);
291 de620_flip_ds(dev);
292 }
293
294 static inline byte
295 de620_read_byte(struct device *dev)
/* */
296 {
297 byte value;
298
299 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
300 value = de620_ready(dev); /* High nibble */
301 de620_flip_ds(dev);
302 value |= de620_ready(dev) >> 4; /* Low nibble */
303 return value;
304 }
305
306 static inline void
307 de620_write_block(struct device *dev, byte *buffer, int count)
/* */
308 {
309 #ifndef LOWSPEED
310 byte uflip = NIC_Cmd ^ (DS0 | DS1);
311 byte dflip = NIC_Cmd;
312 #else /* LOWSPEED */
313 #ifdef COUNT_LOOPS
314 int bytes = count;
315 #endif /* COUNT_LOOPS */
316 #endif /* LOWSPEED */
317
318 #ifdef LOWSPEED
319 #ifdef COUNT_LOOPS
320 tot_cnt = 0;
321 #endif /* COUNT_LOOPS */
322 /* No further optimization useful, the limit is in the adapter. */
323 for ( ; count > 0; --count, ++buffer) {
324 de620_put_byte(dev,*buffer);
325 }
326 de620_send_command(dev,W_DUMMY);
327 #ifdef COUNT_LOOPS
328 /* trial debug output: loops per byte in de620_ready() */
329 printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
330 #endif /* COUNT_LOOPS */
331 #else /* not LOWSPEED */
332 for ( ; count > 0; count -=2) {
333 outb(*buffer++, DATA_PORT);
334 outb(uflip, COMMAND_PORT);
335 outb(*buffer++, DATA_PORT);
336 outb(dflip, COMMAND_PORT);
337 }
338 de620_send_command(dev,W_DUMMY);
339 #endif /* LOWSPEED */
340 }
341
342 static inline void
343 de620_read_block(struct device *dev, byte *data, int count)
/* */
344 {
345 #ifndef LOWSPEED
346 byte value;
347 byte uflip = NIC_Cmd ^ (DS0 | DS1);
348 byte dflip = NIC_Cmd;
349 #else /* LOWSPEED */
350 #ifdef COUNT_LOOPS
351 int bytes = count;
352
353 tot_cnt = 0;
354 #endif /* COUNT_LOOPS */
355 #endif /* LOWSPEED */
356
357 #ifdef LOWSPEED
358 /* No further optimization useful, the limit is in the adapter. */
359 while (count-- > 0) {
360 *data++ = de620_read_byte(dev);
361 de620_flip_ds(dev);
362 }
363 #ifdef COUNT_LOOPS
364 /* trial debug output: loops per byte in de620_ready() */
365 printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
366 #endif /* COUNT_LOOPS */
367 #else /* not LOWSPEED */
368 while (count-- > 0) {
369 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
370 outb(uflip, COMMAND_PORT);
371 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
372 outb(dflip , COMMAND_PORT);
373 }
374 #endif /* LOWSPEED */
375 }
376
377 static inline void
378 de620_set_delay(struct device *dev)
/* */
379 {
380 de620_ready(dev);
381 outb(W_DFR, DATA_PORT);
382 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
383
384 de620_ready(dev);
385 #ifdef LOWSPEED
386 outb(WRITE_DELAY, DATA_PORT);
387 #else
388 outb(0, DATA_PORT);
389 #endif
390 de620_flip_ds(dev);
391
392 de620_ready(dev);
393 #ifdef LOWSPEED
394 outb(READ_DELAY, DATA_PORT);
395 #else
396 outb(0, DATA_PORT);
397 #endif
398 de620_flip_ds(dev);
399 }
400
401 static inline void
402 de620_set_register(struct device *dev, byte reg, byte value)
/* */
403 {
404 de620_ready(dev);
405 outb(reg, DATA_PORT);
406 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
407
408 de620_put_byte(dev, value);
409 }
410
411 static inline byte
412 de620_get_register(struct device *dev, byte reg)
/* */
413 {
414 byte value;
415
416 de620_send_command(dev,reg);
417 value = de620_read_byte(dev);
418 de620_send_command(dev,W_DUMMY);
419
420 return value;
421 }
422
423 /*********************************************************************
424 *
425 * Open/initialize the board.
426 *
427 * This routine should set everything up anew at each open, even
428 * registers that "should" only need to be set once at boot, so that
429 * there is a non-reboot way to recover if something goes wrong.
430 *
431 */
432 static int
433 de620_open(struct device *dev)
/* */
434 {
435 if (request_irq(dev->irq, de620_interrupt, 0, "de620")) {
436 printk ("%s: unable to get IRQ %d\n", dev->name, dev->irq);
437 return 1;
438 }
439 irq2dev_map[dev->irq] = dev;
440
441 MOD_INC_USE_COUNT;
442 if (adapter_init(dev)) {
443 return 1;
444 }
445 dev->start = 1;
446 return 0;
447 }
448
449 /************************************************
450 *
451 * The inverse routine to de620_open().
452 *
453 */
454 static int
455 de620_close(struct device *dev)
/* */
456 {
457 /* disable recv */
458 de620_set_register(dev, W_TCR, RXOFF);
459
460 free_irq(dev->irq);
461 irq2dev_map[dev->irq] = NULL;
462
463 dev->start = 0;
464 MOD_DEC_USE_COUNT;
465 return 0;
466 }
467
468 /*********************************************
469 *
470 * Return current statistics
471 *
472 */
473 static struct netstats *
474 get_stats(struct device *dev)
/* */
475 {
476 return (struct netstats *)(dev->priv);
477 }
478
479 /*********************************************
480 *
481 * Set or clear the multicast filter for this adaptor.
482 * (no real multicast implemented for the DE-620, but she can be promiscuous...)
483 *
484 * num_addrs == -1 Promiscuous mode, receive all packets
485 * num_addrs == 0 Normal mode, clear multicast list
486 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
487 * best-effort filtering.
488 */
489 static void
490 de620_set_multicast_list(struct device *dev, int num_addrs, void *addrs)
/* */
491 {
492 if (num_addrs)
493 { /* Enable promiscuous mode */
494 /*
495 * We must make the kernel realise we had to move
496 * into promisc mode or we start all out war on
497 * the cable. - AC
498 */
499 dev->flags|=IFF_PROMISC;
500
501 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
502 }
503 else { /* Disable promiscuous mode, use normal mode */
504 de620_set_register(dev, W_TCR, TCR_DEF);
505 }
506 }
507
508 /*******************************************************
509 *
510 * Copy a buffer to the adapter transmit page memory.
511 * Start sending.
512 */
513 static int
514 de620_start_xmit(struct sk_buff *skb, struct device *dev)
/* */
515 {
516 unsigned long flags;
517 int len;
518 int tickssofar;
519 byte *buffer = skb->data;
520 byte using_txbuf;
521
522 /*
523 * If some higher layer thinks we've missed a
524 * tx-done interrupt we are passed NULL.
525 * Caution: dev_tint() handles the cli()/sti() itself.
526 */
527
528 if (skb == NULL) {
529 dev_tint(dev);
530 return 0;
531 }
532
533 using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
534 dev->tbusy = (using_txbuf == (TXBF0 | TXBF1)); /* Boolean! */
535
536 if (dev->tbusy) { /* Do timeouts, to avoid hangs. */
537 tickssofar = jiffies - dev->trans_start;
538
539 if (tickssofar < 5)
540 return 1;
541
542 /* else */
543 printk("%s: transmit timed out (%d), %s?\n",
544 dev->name,
545 tickssofar,
546 "network cable problem"
547 );
548 /* Restart the adapter. */
549 if (adapter_init(dev)) /* maybe close it */
550 return 1;
551 }
552
553 if ((len = skb->len) < RUNT)
554 len = RUNT;
555 if (len & 1) /* send an even number of bytes */
556 ++len;
557
558 /* Start real output */
559 save_flags(flags);
560 cli();
561
562 PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
563 (int)skb->len, using_txbuf));
564
565 /* select a free tx buffer. if there is one... */
566 switch (using_txbuf) {
567 default: /* both are free: use TXBF0 */
568 case TXBF1: /* use TXBF0 */
569 de620_send_command(dev,W_CR | RW0);
570 using_txbuf |= TXBF0;
571 break;
572
573 case TXBF0: /* use TXBF1 */
574 de620_send_command(dev,W_CR | RW1);
575 using_txbuf |= TXBF1;
576 break;
577
578 case (TXBF0 | TXBF1): /* NONE!!! */
579 printk("de620: Ouch! No tx-buffer available!\n");
580 restore_flags(flags);
581 return 1;
582 break;
583 }
584 de620_write_block(dev, buffer, len);
585
586 dev->trans_start = jiffies;
587 dev->tbusy = (using_txbuf == (TXBF0 | TXBF1)); /* Boolean! */
588
589 ((struct netstats *)(dev->priv))->tx_packets++;
590
591 restore_flags(flags); /* interrupts maybe back on */
592
593 dev_kfree_skb (skb, FREE_WRITE);
594
595 return 0;
596 }
597
598 /*****************************************************
599 *
600 * Handle the network interface interrupts.
601 *
602 */
603 static void
604 de620_interrupt(int irq_in, struct pt_regs *regs)
/* */
605 {
606 struct device *dev = irq2dev_map[irq_in];
607 byte irq_status;
608 int bogus_count = 0;
609 int again = 0;
610
611 /* This might be deleted now, no crummy drivers present :-) Or..? */
612 if ((dev == NULL) || (irq != irq_in)) {
613 printk("%s: bogus interrupt %d\n", dev?dev->name:"de620", irq_in);
614 return;
615 }
616
617 cli();
618 dev->interrupt = 1;
619
620 /* Read the status register (_not_ the status port) */
621 irq_status = de620_get_register(dev, R_STS);
622
623 PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
624
625 if (irq_status & RXGOOD) {
626 do {
627 again = de620_rx_intr(dev);
628 PRINTK(("again=%d\n", again));
629 }
630 while (again && (++bogus_count < 100));
631 }
632
633 dev->tbusy = (de620_tx_buffs(dev) == (TXBF0 | TXBF1)); /* Boolean! */
634
635 dev->interrupt = 0;
636 sti();
637 return;
638 }
639
640 /**************************************
641 *
642 * Get a packet from the adapter
643 *
644 * Send it "upstairs"
645 *
646 */
647 static int
648 de620_rx_intr(struct device *dev)
/* */
649 {
650 struct header_buf {
651 byte status;
652 byte Rx_NextPage;
653 unsigned short Rx_ByteCount;
654 } header_buf;
655 struct sk_buff *skb;
656 int size;
657 byte *buffer;
658 byte pagelink;
659 byte curr_page;
660
661 PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
662
663 /* Tell the adapter that we are going to read data, and from where */
664 de620_send_command(dev, W_CR | RRN);
665 de620_set_register(dev, W_RSA1, next_rx_page);
666 de620_set_register(dev, W_RSA0, 0);
667
668 /* Deep breath, and away we goooooo */
669 de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
670 PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
671 header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
672
673 /* Plausible page header? */
674 pagelink = header_buf.Rx_NextPage;
675 if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
676 /* Ouch... Forget it! Skip all and start afresh... */
677 printk("%s: Ring overrun? Restoring...\n", dev->name);
678 /* You win some, you loose some. And sometimes plenty... */
679 adapter_init(dev);
680 ((struct netstats *)(dev->priv))->rx_over_errors++;
681 return 0;
682 }
683
684 /* OK, this look good, so far. Let's see if it's consistent... */
685 /* Let's compute the start of the next packet, based on where we are */
686 pagelink = next_rx_page +
687 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
688
689 /* Are we going to wrap around the page counter? */
690 if (pagelink > last_rx_page)
691 pagelink -= (last_rx_page - first_rx_page + 1);
692
693 /* Is the _computed_ next page number equal to what the adapter says? */
694 if (pagelink != header_buf.Rx_NextPage) {
695 /* Naah, we'll skip this packet. Probably bogus data as well */
696 printk("%s: Page link out of sync! Restoring...\n", dev->name);
697 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
698 de620_send_command(dev, W_DUMMY);
699 de620_set_register(dev, W_NPRF, next_rx_page);
700 ((struct netstats *)(dev->priv))->rx_over_errors++;
701 return 0;
702 }
703 next_rx_page = pagelink;
704
705 size = header_buf.Rx_ByteCount - 4;
706 if ((size < RUNT) || (GIANT < size)) {
707 printk("%s: Illegal packet size: %d!\n", dev->name, size);
708 }
709 else { /* Good packet? */
710 skb = dev_alloc_skb(size+2);
711 if (skb == NULL) { /* Yeah, but no place to put it... */
712 printk("%s: Couldn't allocate a sk_buff of size %d.\n",
713 dev->name, size);
714 ((struct netstats *)(dev->priv))->rx_dropped++;
715 }
716 else { /* Yep! Go get it! */
717 skb_reserve(skb,2); /* Align */
718 skb->dev = dev;
719 skb->free = 1;
720 /* skb->data points to the start of sk_buff data area */
721 buffer = skb_put(skb,size);
722 /* copy the packet into the buffer */
723 de620_read_block(dev, buffer, size);
724 PRINTK(("Read %d bytes\n", size));
725 skb->protocol=eth_type_trans(skb,dev);
726 netif_rx(skb); /* deliver it "upstairs" */
727 /* count all receives */
728 ((struct netstats *)(dev->priv))->rx_packets++;
729 }
730 }
731
732 /* Let's peek ahead to see if we have read the last current packet */
733 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
734 curr_page = de620_get_register(dev, R_CPR);
735 de620_set_register(dev, W_NPRF, next_rx_page);
736 PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
737
738 return (next_rx_page != curr_page); /* That was slightly tricky... */
739 }
740
741 /*********************************************
742 *
743 * Reset the adapter to a known state
744 *
745 */
746 static int
747 adapter_init(struct device *dev)
/* */
748 {
749 int i;
750 static int was_down = 0;
751
752 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
753 EIPRegister = NCTL0;
754 if (nic_data.Media != 1)
755 EIPRegister |= NIS0; /* not BNC */
756 }
757 else if (nic_data.Model == 2) { /* UTP */
758 EIPRegister = NCTL0 | NIS0;
759 }
760
761 if (utp)
762 EIPRegister = NCTL0 | NIS0;
763 if (bnc)
764 EIPRegister = NCTL0;
765
766 de620_send_command(dev, W_CR | RNOP | CLEAR);
767 de620_send_command(dev, W_CR | RNOP);
768
769 de620_set_register(dev, W_SCR, SCR_DEF);
770 /* disable recv to wait init */
771 de620_set_register(dev, W_TCR, RXOFF);
772
773 /* Set the node ID in the adapter */
774 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
775 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
776 }
777
778 de620_set_register(dev, W_EIP, EIPRegister);
779
780 next_rx_page = first_rx_page = DE620_RX_START_PAGE;
781 if (nic_data.RAM_Size)
782 last_rx_page = nic_data.RAM_Size - 1;
783 else /* 64k RAM */
784 last_rx_page = 255;
785
786 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
787 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
788 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
789 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
790 de620_send_command(dev, W_DUMMY);
791 de620_set_delay(dev);
792
793 /* Final sanity check: Anybody out there? */
794 /* Let's hope some bits from the statusregister make a good check */
795 #define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
796 #define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
797 /* success: X 0 0 X 0 0 X X */
798 /* ignore: EEDI RXGOOD COLS LNKS*/
799
800 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
801 printk("Something has happened to the DE-620! Please check it"
802 #ifdef SHUTDOWN_WHEN_LOST
803 " and do a new ifconfig"
804 #endif
805 "! (%02x)\n", i);
806 #ifdef SHUTDOWN_WHEN_LOST
807 /* Goodbye, cruel world... */
808 dev->flags &= ~IFF_UP;
809 de620_close(dev);
810 #endif
811 was_down = 1;
812 return 1; /* failed */
813 }
814 if (was_down) {
815 printk("Thanks, I feel much better now!\n");
816 was_down = 0;
817 }
818
819 /* All OK, go ahead... */
820 de620_set_register(dev, W_TCR, TCR_DEF);
821
822 return 0; /* all ok */
823 }
824
825 /******************************************************************************
826 *
827 * Only start-up code below
828 *
829 */
830 /****************************************
831 *
832 * Check if there is a DE-620 connected
833 */
834 int
835 de620_probe(struct device *dev)
/* */
836 {
837 static struct netstats de620_netstats;
838 int i;
839 byte checkbyte = 0xa5;
840
841 /*
842 * This is where the base_addr and irq gets set.
843 * Tunable at compile-time and insmod-time
844 */
845 dev->base_addr = io;
846 dev->irq = irq;
847
848 if (de620_debug)
849 printk(version);
850
851 printk("D-Link DE-620 pocket adapter");
852
853 /* Initially, configure basic nibble mode, so we can read the EEPROM */
854 NIC_Cmd = DEF_NIC_CMD;
855 de620_set_register(dev, W_EIP, EIPRegister);
856
857 /* Anybody out there? */
858 de620_set_register(dev, W_CPR, checkbyte);
859 checkbyte = de620_get_register(dev, R_CPR);
860
861 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
862 printk(" not identified in the printer port\n");
863 return ENODEV;
864 }
865
866 #if 0 /* Not yet */
867 if (check_region(dev->base_addr, 3)) {
868 printk(", port 0x%x busy\n", dev->base_addr);
869 return EBUSY;
870 }
871 #endif
872 request_region(dev->base_addr, 3, "de620");
873
874 /* else, got it! */
875 printk(", Ethernet Address: %2.2X",
876 dev->dev_addr[0] = nic_data.NodeID[0]);
877 for (i = 1; i < ETH_ALEN; i++) {
878 printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
879 dev->broadcast[i] = 0xff;
880 }
881
882 printk(" (%dk RAM,",
883 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
884
885 if (nic_data.Media == 1)
886 printk(" BNC)\n");
887 else
888 printk(" UTP)\n");
889
890 /* Initialize the device structure. */
891 /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
892 dev->priv = &de620_netstats;
893
894 memset(dev->priv, 0, sizeof(struct netstats));
895 dev->get_stats = get_stats;
896 dev->open = de620_open;
897 dev->stop = de620_close;
898 dev->hard_start_xmit = &de620_start_xmit;
899 dev->set_multicast_list = &de620_set_multicast_list;
900 /* base_addr and irq are already set, see above! */
901
902 ether_setup(dev);
903
904 /* dump eeprom */
905 if (de620_debug) {
906 printk("\nEEPROM contents:\n");
907 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
908 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
909 nic_data.NodeID[0], nic_data.NodeID[1],
910 nic_data.NodeID[2], nic_data.NodeID[3],
911 nic_data.NodeID[4], nic_data.NodeID[5]);
912 printk("Model = %d\n", nic_data.Model);
913 printk("Media = %d\n", nic_data.Media);
914 printk("SCR = 0x%02x\n", nic_data.SCR);
915 }
916
917 return 0;
918 }
919
920 /**********************************
921 *
922 * Read info from on-board EEPROM
923 *
924 * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
925 */
926 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
927
928 static unsigned short
929 ReadAWord(struct device *dev, int from)
/* */
930 {
931 unsigned short data;
932 int nbits;
933
934 /* cs [__~~] SET SEND STATE */
935 /* di [____] */
936 /* sck [_~~_] */
937 sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
938
939 /* Send the 9-bit address from where we want to read the 16-bit word */
940 for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
941 if (from & 0x0100) { /* bit set? */
942 /* cs [~~~~] SEND 1 */
943 /* di [~~~~] */
944 /* sck [_~~_] */
945 sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
946 }
947 else {
948 /* cs [~~~~] SEND 0 */
949 /* di [____] */
950 /* sck [_~~_] */
951 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
952 }
953 }
954
955 /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
956 for (data = 0, nbits = 16; nbits > 0; --nbits) {
957 /* cs [~~~~] SEND 0 */
958 /* di [____] */
959 /* sck [_~~_] */
960 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
961 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
962 }
963 /* cs [____] RESET SEND STATE */
964 /* di [____] */
965 /* sck [_~~_] */
966 sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
967
968 return data;
969 }
970
971 static int
972 read_eeprom(struct device *dev)
/* */
973 {
974 unsigned short wrd;
975
976 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
977 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
978 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
979 return -1; /* Nope, not a DE-620 */
980 nic_data.NodeID[0] = wrd & 0xff;
981 nic_data.NodeID[1] = wrd >> 8;
982
983 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
984 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
985 return -1; /* Nope, not a DE-620 */
986 nic_data.NodeID[2] = wrd & 0xff;
987 nic_data.NodeID[3] = wrd >> 8;
988
989 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
990 nic_data.NodeID[4] = wrd & 0xff;
991 nic_data.NodeID[5] = wrd >> 8;
992
993 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
994 nic_data.RAM_Size = (wrd >> 8);
995
996 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
997 nic_data.Model = (wrd & 0xff);
998
999 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
1000 nic_data.Media = (wrd & 0xff);
1001
1002 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
1003 nic_data.SCR = (wrd >> 8);
1004
1005 return 0; /* no errors */
1006 }
1007
1008 /******************************************************************************
1009 *
1010 * Loadable module skeleton
1011 *
1012 */
1013 #ifdef MODULE
1014 static char nullname[8] = "";
1015 static struct device de620_dev = {
1016 nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de620_probe };
1017
1018 int
1019 init_module(void)
/* */
1020 {
1021 if (register_netdev(&de620_dev) != 0)
1022 return -EIO;
1023 return 0;
1024 }
1025
1026 void
1027 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
1028 {
1029 unregister_netdev(&de620_dev);
1030 release_region(de620_dev.base_addr, 3);
1031 }
1032 #endif /* MODULE */
1033
1034 /*
1035 * (add '-DMODULE' when compiling as loadable module)
1036 *
1037 * compile-command:
1038 * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1039 * -fomit-frame-pointer -m486 \
1040 * -I/usr/src/linux/include -I../../net/inet -c de620.c
1041 */
1042 /*
1043 * Local variables:
1044 * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1045 * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1046 * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1047 * End:
1048 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/