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[deliverable/linux.git] / drivers / net / de620.c
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@scyld.com>)
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 * -DSHUTDOWN_WHEN_LOST
52 * -DCOUNT_LOOPS
53 * -DLOWSPEED
54 * -DREAD_DELAY
55 * -DWRITE_DELAY
56 */
57
58 /*
59 * This driver assumes that the printer port is a "normal",
60 * dumb, uni-directional port!
61 * If your port is "fancy" in any way, please try to set it to "normal"
62 * with your BIOS setup. I have no access to machines with bi-directional
63 * ports, so I can't test such a driver :-(
64 * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
65 *
66 * There are some clones of DE620 out there, with different names.
67 * If the current driver does not recognize a clone, try to change
68 * the following #define to:
69 *
70 * #define DE620_CLONE 1
71 */
72 #define DE620_CLONE 0
73
74 /*
75 * If the adapter has problems with high speeds, enable this #define
76 * otherwise full printerport speed will be attempted.
77 *
78 * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
79 *
80 #define LOWSPEED
81 */
82
83 #ifndef READ_DELAY
84 #define READ_DELAY 100 /* adapter internal read delay in 100ns units */
85 #endif
86
87 #ifndef WRITE_DELAY
88 #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */
89 #endif
90
91 /*
92 * Enable this #define if you want the adapter to do a "ifconfig down" on
93 * itself when we have detected that something is possibly wrong with it.
94 * The default behaviour is to retry with "adapter_init()" until success.
95 * This should be used for debugging purposes only.
96 *
97 #define SHUTDOWN_WHEN_LOST
98 */
99
100 #ifdef LOWSPEED
101 /*
102 * Enable this #define if you want to see debugging output that show how long
103 * we have to wait before the DE-620 is ready for the next read/write/command.
104 *
105 #define COUNT_LOOPS
106 */
107 #endif
108
109 #include <linux/module.h>
110 #include <linux/kernel.h>
111 #include <linux/types.h>
112 #include <linux/fcntl.h>
113 #include <linux/string.h>
114 #include <linux/interrupt.h>
115 #include <linux/ioport.h>
116 #include <linux/in.h>
117 #include <linux/errno.h>
118 #include <linux/init.h>
119 #include <linux/inet.h>
120 #include <linux/netdevice.h>
121 #include <linux/etherdevice.h>
122 #include <linux/skbuff.h>
123
124 #include <asm/io.h>
125 #include <asm/system.h>
126
127 /* Constant definitions for the DE-620 registers, commands and bits */
128 #include "de620.h"
129
130 typedef unsigned char byte;
131
132 /*******************************************************
133 * *
134 * Definition of D-Link DE-620 Ethernet Pocket adapter *
135 * See also "de620.h" *
136 * *
137 *******************************************************/
138 #ifndef DE620_IO /* Compile-time configurable */
139 #define DE620_IO 0x378
140 #endif
141
142 #ifndef DE620_IRQ /* Compile-time configurable */
143 #define DE620_IRQ 7
144 #endif
145
146 #define DATA_PORT (dev->base_addr)
147 #define STATUS_PORT (dev->base_addr + 1)
148 #define COMMAND_PORT (dev->base_addr + 2)
149
150 #define RUNT 60 /* Too small Ethernet packet */
151 #define GIANT 1514 /* largest legal size packet, no fcs */
152
153 /*
154 * Force media with insmod:
155 * insmod de620.o bnc=1
156 * or
157 * insmod de620.o utp=1
158 *
159 * Force io and/or irq with insmod:
160 * insmod de620.o io=0x378 irq=7
161 *
162 * Make a clone skip the Ethernet-address range check:
163 * insmod de620.o clone=1
164 */
165 static int bnc;
166 static int utp;
167 static int io = DE620_IO;
168 static int irq = DE620_IRQ;
169 static int clone = DE620_CLONE;
170
171 static spinlock_t de620_lock;
172
173 module_param(bnc, int, 0);
174 module_param(utp, int, 0);
175 module_param(io, int, 0);
176 module_param(irq, int, 0);
177 module_param(clone, int, 0);
178 MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
179 MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
180 MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
181 MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
182 MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
183
184 /***********************************************
185 * *
186 * Index to functions, as function prototypes. *
187 * *
188 ***********************************************/
189
190 /*
191 * Routines used internally. (See also "convenience macros.. below")
192 */
193
194 /* Put in the device structure. */
195 static int de620_open(struct net_device *);
196 static int de620_close(struct net_device *);
197 static void de620_set_multicast_list(struct net_device *);
198 static int de620_start_xmit(struct sk_buff *, struct net_device *);
199
200 /* Dispatch from interrupts. */
201 static irqreturn_t de620_interrupt(int, void *);
202 static int de620_rx_intr(struct net_device *);
203
204 /* Initialization */
205 static int adapter_init(struct net_device *);
206 static int read_eeprom(struct net_device *);
207
208
209 /*
210 * D-Link driver variables:
211 */
212 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
213 #define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */
214 #define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */
215 #define DEF_NIC_CMD IRQEN | ICEN | DS1
216
217 static volatile byte NIC_Cmd;
218 static volatile byte next_rx_page;
219 static byte first_rx_page;
220 static byte last_rx_page;
221 static byte EIPRegister;
222
223 static struct nic {
224 byte NodeID[6];
225 byte RAM_Size;
226 byte Model;
227 byte Media;
228 byte SCR;
229 } nic_data;
230
231 /**********************************************************
232 * *
233 * Convenience macros/functions for D-Link DE-620 adapter *
234 * *
235 **********************************************************/
236 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
237 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
238
239 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
240 #ifdef COUNT_LOOPS
241 static int tot_cnt;
242 #endif
243 static inline byte
244 de620_ready(struct net_device *dev)
245 {
246 byte value;
247 register short int cnt = 0;
248
249 while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
250 ++cnt;
251
252 #ifdef COUNT_LOOPS
253 tot_cnt += cnt;
254 #endif
255 return value & 0xf0; /* nibble */
256 }
257
258 static inline void
259 de620_send_command(struct net_device *dev, byte cmd)
260 {
261 de620_ready(dev);
262 if (cmd == W_DUMMY)
263 outb(NIC_Cmd, COMMAND_PORT);
264
265 outb(cmd, DATA_PORT);
266
267 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
268 de620_ready(dev);
269 outb(NIC_Cmd, COMMAND_PORT);
270 }
271
272 static inline void
273 de620_put_byte(struct net_device *dev, byte value)
274 {
275 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
276 de620_ready(dev);
277 outb(value, DATA_PORT);
278 de620_flip_ds(dev);
279 }
280
281 static inline byte
282 de620_read_byte(struct net_device *dev)
283 {
284 byte value;
285
286 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
287 value = de620_ready(dev); /* High nibble */
288 de620_flip_ds(dev);
289 value |= de620_ready(dev) >> 4; /* Low nibble */
290 return value;
291 }
292
293 static inline void
294 de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
295 {
296 #ifndef LOWSPEED
297 byte uflip = NIC_Cmd ^ (DS0 | DS1);
298 byte dflip = NIC_Cmd;
299 #else /* LOWSPEED */
300 #ifdef COUNT_LOOPS
301 int bytes = count;
302 #endif /* COUNT_LOOPS */
303 #endif /* LOWSPEED */
304
305 #ifdef LOWSPEED
306 #ifdef COUNT_LOOPS
307 tot_cnt = 0;
308 #endif /* COUNT_LOOPS */
309 /* No further optimization useful, the limit is in the adapter. */
310 for ( ; count > 0; --count, ++buffer) {
311 de620_put_byte(dev,*buffer);
312 }
313 for ( count = pad ; count > 0; --count, ++buffer) {
314 de620_put_byte(dev, 0);
315 }
316 de620_send_command(dev,W_DUMMY);
317 #ifdef COUNT_LOOPS
318 /* trial debug output: loops per byte in de620_ready() */
319 printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
320 #endif /* COUNT_LOOPS */
321 #else /* not LOWSPEED */
322 for ( ; count > 0; count -=2) {
323 outb(*buffer++, DATA_PORT);
324 outb(uflip, COMMAND_PORT);
325 outb(*buffer++, DATA_PORT);
326 outb(dflip, COMMAND_PORT);
327 }
328 de620_send_command(dev,W_DUMMY);
329 #endif /* LOWSPEED */
330 }
331
332 static inline void
333 de620_read_block(struct net_device *dev, byte *data, int count)
334 {
335 #ifndef LOWSPEED
336 byte value;
337 byte uflip = NIC_Cmd ^ (DS0 | DS1);
338 byte dflip = NIC_Cmd;
339 #else /* LOWSPEED */
340 #ifdef COUNT_LOOPS
341 int bytes = count;
342
343 tot_cnt = 0;
344 #endif /* COUNT_LOOPS */
345 #endif /* LOWSPEED */
346
347 #ifdef LOWSPEED
348 /* No further optimization useful, the limit is in the adapter. */
349 while (count-- > 0) {
350 *data++ = de620_read_byte(dev);
351 de620_flip_ds(dev);
352 }
353 #ifdef COUNT_LOOPS
354 /* trial debug output: loops per byte in de620_ready() */
355 printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
356 #endif /* COUNT_LOOPS */
357 #else /* not LOWSPEED */
358 while (count-- > 0) {
359 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
360 outb(uflip, COMMAND_PORT);
361 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
362 outb(dflip , COMMAND_PORT);
363 }
364 #endif /* LOWSPEED */
365 }
366
367 static inline void
368 de620_set_delay(struct net_device *dev)
369 {
370 de620_ready(dev);
371 outb(W_DFR, DATA_PORT);
372 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
373
374 de620_ready(dev);
375 #ifdef LOWSPEED
376 outb(WRITE_DELAY, DATA_PORT);
377 #else
378 outb(0, DATA_PORT);
379 #endif
380 de620_flip_ds(dev);
381
382 de620_ready(dev);
383 #ifdef LOWSPEED
384 outb(READ_DELAY, DATA_PORT);
385 #else
386 outb(0, DATA_PORT);
387 #endif
388 de620_flip_ds(dev);
389 }
390
391 static inline void
392 de620_set_register(struct net_device *dev, byte reg, byte value)
393 {
394 de620_ready(dev);
395 outb(reg, DATA_PORT);
396 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
397
398 de620_put_byte(dev, value);
399 }
400
401 static inline byte
402 de620_get_register(struct net_device *dev, byte reg)
403 {
404 byte value;
405
406 de620_send_command(dev,reg);
407 value = de620_read_byte(dev);
408 de620_send_command(dev,W_DUMMY);
409
410 return value;
411 }
412
413 /*********************************************************************
414 *
415 * Open/initialize the board.
416 *
417 * This routine should set everything up anew at each open, even
418 * registers that "should" only need to be set once at boot, so that
419 * there is a non-reboot way to recover if something goes wrong.
420 *
421 */
422 static int de620_open(struct net_device *dev)
423 {
424 int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
425 if (ret) {
426 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
427 return ret;
428 }
429
430 if (adapter_init(dev)) {
431 ret = -EIO;
432 goto out_free_irq;
433 }
434
435 netif_start_queue(dev);
436 return 0;
437
438 out_free_irq:
439 free_irq(dev->irq, dev);
440 return ret;
441 }
442
443 /************************************************
444 *
445 * The inverse routine to de620_open().
446 *
447 */
448
449 static int de620_close(struct net_device *dev)
450 {
451 netif_stop_queue(dev);
452 /* disable recv */
453 de620_set_register(dev, W_TCR, RXOFF);
454 free_irq(dev->irq, dev);
455 return 0;
456 }
457
458 /*********************************************
459 *
460 * Set or clear the multicast filter for this adaptor.
461 * (no real multicast implemented for the DE-620, but she can be promiscuous...)
462 *
463 */
464
465 static void de620_set_multicast_list(struct net_device *dev)
466 {
467 if (!netdev_mc_empty(dev) || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
468 { /* Enable promiscuous mode */
469 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
470 }
471 else
472 { /* Disable promiscuous mode, use normal mode */
473 de620_set_register(dev, W_TCR, TCR_DEF);
474 }
475 }
476
477 /*******************************************************
478 *
479 * Handle timeouts on transmit
480 */
481
482 static void de620_timeout(struct net_device *dev)
483 {
484 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
485 /* Restart the adapter. */
486 if (!adapter_init(dev)) /* maybe close it */
487 netif_wake_queue(dev);
488 }
489
490 /*******************************************************
491 *
492 * Copy a buffer to the adapter transmit page memory.
493 * Start sending.
494 */
495 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
496 {
497 unsigned long flags;
498 int len;
499 byte *buffer = skb->data;
500 byte using_txbuf;
501
502 using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
503
504 netif_stop_queue(dev);
505
506
507 if ((len = skb->len) < RUNT)
508 len = RUNT;
509 if (len & 1) /* send an even number of bytes */
510 ++len;
511
512 /* Start real output */
513
514 spin_lock_irqsave(&de620_lock, flags);
515 pr_debug("de620_start_xmit: len=%d, bufs 0x%02x\n",
516 (int)skb->len, using_txbuf);
517
518 /* select a free tx buffer. if there is one... */
519 switch (using_txbuf) {
520 default: /* both are free: use TXBF0 */
521 case TXBF1: /* use TXBF0 */
522 de620_send_command(dev,W_CR | RW0);
523 using_txbuf |= TXBF0;
524 break;
525
526 case TXBF0: /* use TXBF1 */
527 de620_send_command(dev,W_CR | RW1);
528 using_txbuf |= TXBF1;
529 break;
530
531 case (TXBF0 | TXBF1): /* NONE!!! */
532 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
533 spin_unlock_irqrestore(&de620_lock, flags);
534 return NETDEV_TX_BUSY;
535 }
536 de620_write_block(dev, buffer, skb->len, len-skb->len);
537
538 if(!(using_txbuf == (TXBF0 | TXBF1)))
539 netif_wake_queue(dev);
540
541 dev->stats.tx_packets++;
542 spin_unlock_irqrestore(&de620_lock, flags);
543 dev_kfree_skb (skb);
544 return NETDEV_TX_OK;
545 }
546
547 /*****************************************************
548 *
549 * Handle the network interface interrupts.
550 *
551 */
552 static irqreturn_t
553 de620_interrupt(int irq_in, void *dev_id)
554 {
555 struct net_device *dev = dev_id;
556 byte irq_status;
557 int bogus_count = 0;
558 int again = 0;
559
560 spin_lock(&de620_lock);
561
562 /* Read the status register (_not_ the status port) */
563 irq_status = de620_get_register(dev, R_STS);
564
565 pr_debug("de620_interrupt (%2.2X)\n", irq_status);
566
567 if (irq_status & RXGOOD) {
568 do {
569 again = de620_rx_intr(dev);
570 pr_debug("again=%d\n", again);
571 }
572 while (again && (++bogus_count < 100));
573 }
574
575 if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
576 netif_wake_queue(dev);
577
578 spin_unlock(&de620_lock);
579 return IRQ_HANDLED;
580 }
581
582 /**************************************
583 *
584 * Get a packet from the adapter
585 *
586 * Send it "upstairs"
587 *
588 */
589 static int de620_rx_intr(struct net_device *dev)
590 {
591 struct header_buf {
592 byte status;
593 byte Rx_NextPage;
594 unsigned short Rx_ByteCount;
595 } header_buf;
596 struct sk_buff *skb;
597 int size;
598 byte *buffer;
599 byte pagelink;
600 byte curr_page;
601
602 pr_debug("de620_rx_intr: next_rx_page = %d\n", next_rx_page);
603
604 /* Tell the adapter that we are going to read data, and from where */
605 de620_send_command(dev, W_CR | RRN);
606 de620_set_register(dev, W_RSA1, next_rx_page);
607 de620_set_register(dev, W_RSA0, 0);
608
609 /* Deep breath, and away we goooooo */
610 de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
611 pr_debug("page status=0x%02x, nextpage=%d, packetsize=%d\n",
612 header_buf.status, header_buf.Rx_NextPage,
613 header_buf.Rx_ByteCount);
614
615 /* Plausible page header? */
616 pagelink = header_buf.Rx_NextPage;
617 if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
618 /* Ouch... Forget it! Skip all and start afresh... */
619 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
620 /* You win some, you lose some. And sometimes plenty... */
621 adapter_init(dev);
622 netif_wake_queue(dev);
623 dev->stats.rx_over_errors++;
624 return 0;
625 }
626
627 /* OK, this look good, so far. Let's see if it's consistent... */
628 /* Let's compute the start of the next packet, based on where we are */
629 pagelink = next_rx_page +
630 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
631
632 /* Are we going to wrap around the page counter? */
633 if (pagelink > last_rx_page)
634 pagelink -= (last_rx_page - first_rx_page + 1);
635
636 /* Is the _computed_ next page number equal to what the adapter says? */
637 if (pagelink != header_buf.Rx_NextPage) {
638 /* Naah, we'll skip this packet. Probably bogus data as well */
639 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
640 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
641 de620_send_command(dev, W_DUMMY);
642 de620_set_register(dev, W_NPRF, next_rx_page);
643 dev->stats.rx_over_errors++;
644 return 0;
645 }
646 next_rx_page = pagelink;
647
648 size = header_buf.Rx_ByteCount - 4;
649 if ((size < RUNT) || (GIANT < size)) {
650 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
651 }
652 else { /* Good packet? */
653 skb = dev_alloc_skb(size+2);
654 if (skb == NULL) { /* Yeah, but no place to put it... */
655 printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
656 dev->stats.rx_dropped++;
657 }
658 else { /* Yep! Go get it! */
659 skb_reserve(skb,2); /* Align */
660 /* skb->data points to the start of sk_buff data area */
661 buffer = skb_put(skb,size);
662 /* copy the packet into the buffer */
663 de620_read_block(dev, buffer, size);
664 pr_debug("Read %d bytes\n", size);
665 skb->protocol=eth_type_trans(skb,dev);
666 netif_rx(skb); /* deliver it "upstairs" */
667 /* count all receives */
668 dev->stats.rx_packets++;
669 dev->stats.rx_bytes += size;
670 }
671 }
672
673 /* Let's peek ahead to see if we have read the last current packet */
674 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
675 curr_page = de620_get_register(dev, R_CPR);
676 de620_set_register(dev, W_NPRF, next_rx_page);
677 pr_debug("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page);
678
679 return (next_rx_page != curr_page); /* That was slightly tricky... */
680 }
681
682 /*********************************************
683 *
684 * Reset the adapter to a known state
685 *
686 */
687 static int adapter_init(struct net_device *dev)
688 {
689 int i;
690 static int was_down;
691
692 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
693 EIPRegister = NCTL0;
694 if (nic_data.Media != 1)
695 EIPRegister |= NIS0; /* not BNC */
696 }
697 else if (nic_data.Model == 2) { /* UTP */
698 EIPRegister = NCTL0 | NIS0;
699 }
700
701 if (utp)
702 EIPRegister = NCTL0 | NIS0;
703 if (bnc)
704 EIPRegister = NCTL0;
705
706 de620_send_command(dev, W_CR | RNOP | CLEAR);
707 de620_send_command(dev, W_CR | RNOP);
708
709 de620_set_register(dev, W_SCR, SCR_DEF);
710 /* disable recv to wait init */
711 de620_set_register(dev, W_TCR, RXOFF);
712
713 /* Set the node ID in the adapter */
714 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
715 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
716 }
717
718 de620_set_register(dev, W_EIP, EIPRegister);
719
720 next_rx_page = first_rx_page = DE620_RX_START_PAGE;
721 if (nic_data.RAM_Size)
722 last_rx_page = nic_data.RAM_Size - 1;
723 else /* 64k RAM */
724 last_rx_page = 255;
725
726 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
727 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
728 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
729 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
730 de620_send_command(dev, W_DUMMY);
731 de620_set_delay(dev);
732
733 /* Final sanity check: Anybody out there? */
734 /* Let's hope some bits from the statusregister make a good check */
735 #define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
736 #define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
737 /* success: X 0 0 X 0 0 X X */
738 /* ignore: EEDI RXGOOD COLS LNKS*/
739
740 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
741 printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
742 #ifdef SHUTDOWN_WHEN_LOST
743 " and do a new ifconfig"
744 #endif
745 "! (%02x)\n", dev->name, i);
746 #ifdef SHUTDOWN_WHEN_LOST
747 /* Goodbye, cruel world... */
748 dev->flags &= ~IFF_UP;
749 de620_close(dev);
750 #endif
751 was_down = 1;
752 return 1; /* failed */
753 }
754 if (was_down) {
755 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
756 was_down = 0;
757 }
758
759 /* All OK, go ahead... */
760 de620_set_register(dev, W_TCR, TCR_DEF);
761
762 return 0; /* all ok */
763 }
764
765 static const struct net_device_ops de620_netdev_ops = {
766 .ndo_open = de620_open,
767 .ndo_stop = de620_close,
768 .ndo_start_xmit = de620_start_xmit,
769 .ndo_tx_timeout = de620_timeout,
770 .ndo_set_multicast_list = de620_set_multicast_list,
771 .ndo_change_mtu = eth_change_mtu,
772 .ndo_set_mac_address = eth_mac_addr,
773 .ndo_validate_addr = eth_validate_addr,
774 };
775
776 /******************************************************************************
777 *
778 * Only start-up code below
779 *
780 */
781 /****************************************
782 *
783 * Check if there is a DE-620 connected
784 */
785 struct net_device * __init de620_probe(int unit)
786 {
787 byte checkbyte = 0xa5;
788 struct net_device *dev;
789 int err = -ENOMEM;
790 int i;
791
792 dev = alloc_etherdev(0);
793 if (!dev)
794 goto out;
795
796 spin_lock_init(&de620_lock);
797
798 /*
799 * This is where the base_addr and irq gets set.
800 * Tunable at compile-time and insmod-time
801 */
802 dev->base_addr = io;
803 dev->irq = irq;
804
805 /* allow overriding parameters on command line */
806 if (unit >= 0) {
807 sprintf(dev->name, "eth%d", unit);
808 netdev_boot_setup_check(dev);
809 }
810
811 pr_debug("%s", version);
812
813 printk(KERN_INFO "D-Link DE-620 pocket adapter");
814
815 if (!request_region(dev->base_addr, 3, "de620")) {
816 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
817 err = -EBUSY;
818 goto out1;
819 }
820
821 /* Initially, configure basic nibble mode, so we can read the EEPROM */
822 NIC_Cmd = DEF_NIC_CMD;
823 de620_set_register(dev, W_EIP, EIPRegister);
824
825 /* Anybody out there? */
826 de620_set_register(dev, W_CPR, checkbyte);
827 checkbyte = de620_get_register(dev, R_CPR);
828
829 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
830 printk(" not identified in the printer port\n");
831 err = -ENODEV;
832 goto out2;
833 }
834
835 /* else, got it! */
836 dev->dev_addr[0] = nic_data.NodeID[0];
837 for (i = 1; i < ETH_ALEN; i++) {
838 dev->dev_addr[i] = nic_data.NodeID[i];
839 dev->broadcast[i] = 0xff;
840 }
841
842 printk(", Ethernet Address: %pM", dev->dev_addr);
843
844 printk(" (%dk RAM,",
845 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
846
847 if (nic_data.Media == 1)
848 printk(" BNC)\n");
849 else
850 printk(" UTP)\n");
851
852 dev->netdev_ops = &de620_netdev_ops;
853 dev->watchdog_timeo = HZ*2;
854
855 /* base_addr and irq are already set, see above! */
856
857 /* dump eeprom */
858 pr_debug("\nEEPROM contents:\n"
859 "RAM_Size = 0x%02X\n"
860 "NodeID = %pM\n"
861 "Model = %d\n"
862 "Media = %d\n"
863 "SCR = 0x%02x\n", nic_data.RAM_Size, nic_data.NodeID,
864 nic_data.Model, nic_data.Media, nic_data.SCR);
865
866 err = register_netdev(dev);
867 if (err)
868 goto out2;
869 return dev;
870
871 out2:
872 release_region(dev->base_addr, 3);
873 out1:
874 free_netdev(dev);
875 out:
876 return ERR_PTR(err);
877 }
878
879 /**********************************
880 *
881 * Read info from on-board EEPROM
882 *
883 * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
884 */
885 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
886
887 static unsigned short __init ReadAWord(struct net_device *dev, int from)
888 {
889 unsigned short data;
890 int nbits;
891
892 /* cs [__~~] SET SEND STATE */
893 /* di [____] */
894 /* sck [_~~_] */
895 sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
896
897 /* Send the 9-bit address from where we want to read the 16-bit word */
898 for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
899 if (from & 0x0100) { /* bit set? */
900 /* cs [~~~~] SEND 1 */
901 /* di [~~~~] */
902 /* sck [_~~_] */
903 sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
904 }
905 else {
906 /* cs [~~~~] SEND 0 */
907 /* di [____] */
908 /* sck [_~~_] */
909 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
910 }
911 }
912
913 /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
914 for (data = 0, nbits = 16; nbits > 0; --nbits) {
915 /* cs [~~~~] SEND 0 */
916 /* di [____] */
917 /* sck [_~~_] */
918 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
919 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
920 }
921 /* cs [____] RESET SEND STATE */
922 /* di [____] */
923 /* sck [_~~_] */
924 sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
925
926 return data;
927 }
928
929 static int __init read_eeprom(struct net_device *dev)
930 {
931 unsigned short wrd;
932
933 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
934 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
935 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
936 return -1; /* Nope, not a DE-620 */
937 nic_data.NodeID[0] = wrd & 0xff;
938 nic_data.NodeID[1] = wrd >> 8;
939
940 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
941 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
942 return -1; /* Nope, not a DE-620 */
943 nic_data.NodeID[2] = wrd & 0xff;
944 nic_data.NodeID[3] = wrd >> 8;
945
946 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
947 nic_data.NodeID[4] = wrd & 0xff;
948 nic_data.NodeID[5] = wrd >> 8;
949
950 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
951 nic_data.RAM_Size = (wrd >> 8);
952
953 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
954 nic_data.Model = (wrd & 0xff);
955
956 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
957 nic_data.Media = (wrd & 0xff);
958
959 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
960 nic_data.SCR = (wrd >> 8);
961
962 return 0; /* no errors */
963 }
964
965 /******************************************************************************
966 *
967 * Loadable module skeleton
968 *
969 */
970 #ifdef MODULE
971 static struct net_device *de620_dev;
972
973 int __init init_module(void)
974 {
975 de620_dev = de620_probe(-1);
976 if (IS_ERR(de620_dev))
977 return PTR_ERR(de620_dev);
978 return 0;
979 }
980
981 void cleanup_module(void)
982 {
983 unregister_netdev(de620_dev);
984 release_region(de620_dev->base_addr, 3);
985 free_netdev(de620_dev);
986 }
987 #endif /* MODULE */
988 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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