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[mirror_ubuntu-bionic-kernel.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 \f
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 by enabling the following #define
104 *
105 * use 0 for production, 1 for verification, >2 for debug
106 *
107 #define DE620_DEBUG 3
108 */
109
110 #ifdef LOWSPEED
111 /*
112 * Enable this #define if you want to see debugging output that show how long
113 * we have to wait before the DE-620 is ready for the next read/write/command.
114 *
115 #define COUNT_LOOPS
116 */
117 #endif
118 \f
119 #include <linux/module.h>
120 #include <linux/kernel.h>
121 #include <linux/types.h>
122 #include <linux/fcntl.h>
123 #include <linux/string.h>
124 #include <linux/interrupt.h>
125 #include <linux/ioport.h>
126 #include <linux/in.h>
127 #include <linux/errno.h>
128 #include <linux/init.h>
129 #include <linux/inet.h>
130 #include <linux/netdevice.h>
131 #include <linux/etherdevice.h>
132 #include <linux/skbuff.h>
133
134 #include <asm/io.h>
135 #include <asm/system.h>
136
137 /* Constant definitions for the DE-620 registers, commands and bits */
138 #include "de620.h"
139
140 typedef unsigned char byte;
141
142 /*******************************************************
143 * *
144 * Definition of D-Link DE-620 Ethernet Pocket adapter *
145 * See also "de620.h" *
146 * *
147 *******************************************************/
148 #ifndef DE620_IO /* Compile-time configurable */
149 #define DE620_IO 0x378
150 #endif
151
152 #ifndef DE620_IRQ /* Compile-time configurable */
153 #define DE620_IRQ 7
154 #endif
155
156 #define DATA_PORT (dev->base_addr)
157 #define STATUS_PORT (dev->base_addr + 1)
158 #define COMMAND_PORT (dev->base_addr + 2)
159
160 #define RUNT 60 /* Too small Ethernet packet */
161 #define GIANT 1514 /* largest legal size packet, no fcs */
162
163 #ifdef DE620_DEBUG /* Compile-time configurable */
164 #define PRINTK(x) if (de620_debug >= 2) printk x
165 #else
166 #define DE620_DEBUG 0
167 #define PRINTK(x) /**/
168 #endif
169
170
171 /*
172 * Force media with insmod:
173 * insmod de620.o bnc=1
174 * or
175 * insmod de620.o utp=1
176 *
177 * Force io and/or irq with insmod:
178 * insmod de620.o io=0x378 irq=7
179 *
180 * Make a clone skip the Ethernet-address range check:
181 * insmod de620.o clone=1
182 */
183 static int bnc;
184 static int utp;
185 static int io = DE620_IO;
186 static int irq = DE620_IRQ;
187 static int clone = DE620_CLONE;
188
189 static unsigned int de620_debug = DE620_DEBUG;
190
191 static spinlock_t de620_lock;
192
193 module_param(bnc, int, 0);
194 module_param(utp, int, 0);
195 module_param(io, int, 0);
196 module_param(irq, int, 0);
197 module_param(clone, int, 0);
198 module_param(de620_debug, int, 0);
199 MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
200 MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
201 MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
202 MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
203 MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
204 MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)");
205
206 /***********************************************
207 * *
208 * Index to functions, as function prototypes. *
209 * *
210 ***********************************************/
211
212 /*
213 * Routines used internally. (See also "convenience macros.. below")
214 */
215
216 /* Put in the device structure. */
217 static int de620_open(struct net_device *);
218 static int de620_close(struct net_device *);
219 static struct net_device_stats *get_stats(struct net_device *);
220 static void de620_set_multicast_list(struct net_device *);
221 static int de620_start_xmit(struct sk_buff *, struct net_device *);
222
223 /* Dispatch from interrupts. */
224 static irqreturn_t de620_interrupt(int, void *, struct pt_regs *);
225 static int de620_rx_intr(struct net_device *);
226
227 /* Initialization */
228 static int adapter_init(struct net_device *);
229 static int read_eeprom(struct net_device *);
230
231
232 /*
233 * D-Link driver variables:
234 */
235 #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
236 #define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */
237 #define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */
238 #define DEF_NIC_CMD IRQEN | ICEN | DS1
239
240 static volatile byte NIC_Cmd;
241 static volatile byte next_rx_page;
242 static byte first_rx_page;
243 static byte last_rx_page;
244 static byte EIPRegister;
245
246 static struct nic {
247 byte NodeID[6];
248 byte RAM_Size;
249 byte Model;
250 byte Media;
251 byte SCR;
252 } nic_data;
253 \f
254 /**********************************************************
255 * *
256 * Convenience macros/functions for D-Link DE-620 adapter *
257 * *
258 **********************************************************/
259 #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
260 #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
261
262 /* Check for ready-status, and return a nibble (high 4 bits) for data input */
263 #ifdef COUNT_LOOPS
264 static int tot_cnt;
265 #endif
266 static inline byte
267 de620_ready(struct net_device *dev)
268 {
269 byte value;
270 register short int cnt = 0;
271
272 while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
273 ++cnt;
274
275 #ifdef COUNT_LOOPS
276 tot_cnt += cnt;
277 #endif
278 return value & 0xf0; /* nibble */
279 }
280
281 static inline void
282 de620_send_command(struct net_device *dev, byte cmd)
283 {
284 de620_ready(dev);
285 if (cmd == W_DUMMY)
286 outb(NIC_Cmd, COMMAND_PORT);
287
288 outb(cmd, DATA_PORT);
289
290 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
291 de620_ready(dev);
292 outb(NIC_Cmd, COMMAND_PORT);
293 }
294
295 static inline void
296 de620_put_byte(struct net_device *dev, byte value)
297 {
298 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
299 de620_ready(dev);
300 outb(value, DATA_PORT);
301 de620_flip_ds(dev);
302 }
303
304 static inline byte
305 de620_read_byte(struct net_device *dev)
306 {
307 byte value;
308
309 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
310 value = de620_ready(dev); /* High nibble */
311 de620_flip_ds(dev);
312 value |= de620_ready(dev) >> 4; /* Low nibble */
313 return value;
314 }
315
316 static inline void
317 de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
318 {
319 #ifndef LOWSPEED
320 byte uflip = NIC_Cmd ^ (DS0 | DS1);
321 byte dflip = NIC_Cmd;
322 #else /* LOWSPEED */
323 #ifdef COUNT_LOOPS
324 int bytes = count;
325 #endif /* COUNT_LOOPS */
326 #endif /* LOWSPEED */
327
328 #ifdef LOWSPEED
329 #ifdef COUNT_LOOPS
330 tot_cnt = 0;
331 #endif /* COUNT_LOOPS */
332 /* No further optimization useful, the limit is in the adapter. */
333 for ( ; count > 0; --count, ++buffer) {
334 de620_put_byte(dev,*buffer);
335 }
336 for ( count = pad ; count > 0; --count, ++buffer) {
337 de620_put_byte(dev, 0);
338 }
339 de620_send_command(dev,W_DUMMY);
340 #ifdef COUNT_LOOPS
341 /* trial debug output: loops per byte in de620_ready() */
342 printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
343 #endif /* COUNT_LOOPS */
344 #else /* not LOWSPEED */
345 for ( ; count > 0; count -=2) {
346 outb(*buffer++, DATA_PORT);
347 outb(uflip, COMMAND_PORT);
348 outb(*buffer++, DATA_PORT);
349 outb(dflip, COMMAND_PORT);
350 }
351 de620_send_command(dev,W_DUMMY);
352 #endif /* LOWSPEED */
353 }
354
355 static inline void
356 de620_read_block(struct net_device *dev, byte *data, int count)
357 {
358 #ifndef LOWSPEED
359 byte value;
360 byte uflip = NIC_Cmd ^ (DS0 | DS1);
361 byte dflip = NIC_Cmd;
362 #else /* LOWSPEED */
363 #ifdef COUNT_LOOPS
364 int bytes = count;
365
366 tot_cnt = 0;
367 #endif /* COUNT_LOOPS */
368 #endif /* LOWSPEED */
369
370 #ifdef LOWSPEED
371 /* No further optimization useful, the limit is in the adapter. */
372 while (count-- > 0) {
373 *data++ = de620_read_byte(dev);
374 de620_flip_ds(dev);
375 }
376 #ifdef COUNT_LOOPS
377 /* trial debug output: loops per byte in de620_ready() */
378 printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
379 #endif /* COUNT_LOOPS */
380 #else /* not LOWSPEED */
381 while (count-- > 0) {
382 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
383 outb(uflip, COMMAND_PORT);
384 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
385 outb(dflip , COMMAND_PORT);
386 }
387 #endif /* LOWSPEED */
388 }
389
390 static inline void
391 de620_set_delay(struct net_device *dev)
392 {
393 de620_ready(dev);
394 outb(W_DFR, DATA_PORT);
395 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
396
397 de620_ready(dev);
398 #ifdef LOWSPEED
399 outb(WRITE_DELAY, DATA_PORT);
400 #else
401 outb(0, DATA_PORT);
402 #endif
403 de620_flip_ds(dev);
404
405 de620_ready(dev);
406 #ifdef LOWSPEED
407 outb(READ_DELAY, DATA_PORT);
408 #else
409 outb(0, DATA_PORT);
410 #endif
411 de620_flip_ds(dev);
412 }
413
414 static inline void
415 de620_set_register(struct net_device *dev, byte reg, byte value)
416 {
417 de620_ready(dev);
418 outb(reg, DATA_PORT);
419 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
420
421 de620_put_byte(dev, value);
422 }
423
424 static inline byte
425 de620_get_register(struct net_device *dev, byte reg)
426 {
427 byte value;
428
429 de620_send_command(dev,reg);
430 value = de620_read_byte(dev);
431 de620_send_command(dev,W_DUMMY);
432
433 return value;
434 }
435 \f
436 /*********************************************************************
437 *
438 * Open/initialize the board.
439 *
440 * This routine should set everything up anew at each open, even
441 * registers that "should" only need to be set once at boot, so that
442 * there is a non-reboot way to recover if something goes wrong.
443 *
444 */
445 static int de620_open(struct net_device *dev)
446 {
447 int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
448 if (ret) {
449 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
450 return ret;
451 }
452
453 if (adapter_init(dev)) {
454 ret = -EIO;
455 goto out_free_irq;
456 }
457
458 netif_start_queue(dev);
459 return 0;
460
461 out_free_irq:
462 free_irq(dev->irq, dev);
463 return ret;
464 }
465
466 /************************************************
467 *
468 * The inverse routine to de620_open().
469 *
470 */
471
472 static int de620_close(struct net_device *dev)
473 {
474 netif_stop_queue(dev);
475 /* disable recv */
476 de620_set_register(dev, W_TCR, RXOFF);
477 free_irq(dev->irq, dev);
478 return 0;
479 }
480
481 /*********************************************
482 *
483 * Return current statistics
484 *
485 */
486 static struct net_device_stats *get_stats(struct net_device *dev)
487 {
488 return (struct net_device_stats *)(dev->priv);
489 }
490
491 /*********************************************
492 *
493 * Set or clear the multicast filter for this adaptor.
494 * (no real multicast implemented for the DE-620, but she can be promiscuous...)
495 *
496 */
497
498 static void de620_set_multicast_list(struct net_device *dev)
499 {
500 if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
501 { /* Enable promiscuous mode */
502 /*
503 * We must make the kernel realise we had to move
504 * into promisc mode or we start all out war on
505 * the cable. - AC
506 */
507 dev->flags|=IFF_PROMISC;
508
509 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
510 }
511 else
512 { /* Disable promiscuous mode, use normal mode */
513 de620_set_register(dev, W_TCR, TCR_DEF);
514 }
515 }
516
517 /*******************************************************
518 *
519 * Handle timeouts on transmit
520 */
521
522 static void de620_timeout(struct net_device *dev)
523 {
524 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
525 /* Restart the adapter. */
526 if (!adapter_init(dev)) /* maybe close it */
527 netif_wake_queue(dev);
528 }
529
530 /*******************************************************
531 *
532 * Copy a buffer to the adapter transmit page memory.
533 * Start sending.
534 */
535 static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
536 {
537 unsigned long flags;
538 int len;
539 byte *buffer = skb->data;
540 byte using_txbuf;
541
542 using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
543
544 netif_stop_queue(dev);
545
546
547 if ((len = skb->len) < RUNT)
548 len = RUNT;
549 if (len & 1) /* send an even number of bytes */
550 ++len;
551
552 /* Start real output */
553
554 spin_lock_irqsave(&de620_lock, flags)
555 PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
556 (int)skb->len, using_txbuf));
557
558 /* select a free tx buffer. if there is one... */
559 switch (using_txbuf) {
560 default: /* both are free: use TXBF0 */
561 case TXBF1: /* use TXBF0 */
562 de620_send_command(dev,W_CR | RW0);
563 using_txbuf |= TXBF0;
564 break;
565
566 case TXBF0: /* use TXBF1 */
567 de620_send_command(dev,W_CR | RW1);
568 using_txbuf |= TXBF1;
569 break;
570
571 case (TXBF0 | TXBF1): /* NONE!!! */
572 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
573 spin_unlock_irqrestore(&de620_lock, flags);
574 return 1;
575 }
576 de620_write_block(dev, buffer, skb->len, len-skb->len);
577
578 dev->trans_start = jiffies;
579 if(!(using_txbuf == (TXBF0 | TXBF1)))
580 netif_wake_queue(dev);
581
582 ((struct net_device_stats *)(dev->priv))->tx_packets++;
583 spin_unlock_irqrestore(&de620_lock, flags);
584 dev_kfree_skb (skb);
585 return 0;
586 }
587 \f
588 /*****************************************************
589 *
590 * Handle the network interface interrupts.
591 *
592 */
593 static irqreturn_t
594 de620_interrupt(int irq_in, void *dev_id, struct pt_regs *regs)
595 {
596 struct net_device *dev = dev_id;
597 byte irq_status;
598 int bogus_count = 0;
599 int again = 0;
600
601 spin_lock(&de620_lock);
602
603 /* Read the status register (_not_ the status port) */
604 irq_status = de620_get_register(dev, R_STS);
605
606 PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
607
608 if (irq_status & RXGOOD) {
609 do {
610 again = de620_rx_intr(dev);
611 PRINTK(("again=%d\n", again));
612 }
613 while (again && (++bogus_count < 100));
614 }
615
616 if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
617 netif_wake_queue(dev);
618
619 spin_unlock(&de620_lock);
620 return IRQ_HANDLED;
621 }
622
623 /**************************************
624 *
625 * Get a packet from the adapter
626 *
627 * Send it "upstairs"
628 *
629 */
630 static int de620_rx_intr(struct net_device *dev)
631 {
632 struct header_buf {
633 byte status;
634 byte Rx_NextPage;
635 unsigned short Rx_ByteCount;
636 } header_buf;
637 struct sk_buff *skb;
638 int size;
639 byte *buffer;
640 byte pagelink;
641 byte curr_page;
642
643 PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
644
645 /* Tell the adapter that we are going to read data, and from where */
646 de620_send_command(dev, W_CR | RRN);
647 de620_set_register(dev, W_RSA1, next_rx_page);
648 de620_set_register(dev, W_RSA0, 0);
649
650 /* Deep breath, and away we goooooo */
651 de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
652 PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
653 header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
654
655 /* Plausible page header? */
656 pagelink = header_buf.Rx_NextPage;
657 if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
658 /* Ouch... Forget it! Skip all and start afresh... */
659 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
660 /* You win some, you lose some. And sometimes plenty... */
661 adapter_init(dev);
662 netif_wake_queue(dev);
663 ((struct net_device_stats *)(dev->priv))->rx_over_errors++;
664 return 0;
665 }
666
667 /* OK, this look good, so far. Let's see if it's consistent... */
668 /* Let's compute the start of the next packet, based on where we are */
669 pagelink = next_rx_page +
670 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
671
672 /* Are we going to wrap around the page counter? */
673 if (pagelink > last_rx_page)
674 pagelink -= (last_rx_page - first_rx_page + 1);
675
676 /* Is the _computed_ next page number equal to what the adapter says? */
677 if (pagelink != header_buf.Rx_NextPage) {
678 /* Naah, we'll skip this packet. Probably bogus data as well */
679 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
680 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
681 de620_send_command(dev, W_DUMMY);
682 de620_set_register(dev, W_NPRF, next_rx_page);
683 ((struct net_device_stats *)(dev->priv))->rx_over_errors++;
684 return 0;
685 }
686 next_rx_page = pagelink;
687
688 size = header_buf.Rx_ByteCount - 4;
689 if ((size < RUNT) || (GIANT < size)) {
690 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
691 }
692 else { /* Good packet? */
693 skb = dev_alloc_skb(size+2);
694 if (skb == NULL) { /* Yeah, but no place to put it... */
695 printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
696 ((struct net_device_stats *)(dev->priv))->rx_dropped++;
697 }
698 else { /* Yep! Go get it! */
699 skb_reserve(skb,2); /* Align */
700 skb->dev = dev;
701 /* skb->data points to the start of sk_buff data area */
702 buffer = skb_put(skb,size);
703 /* copy the packet into the buffer */
704 de620_read_block(dev, buffer, size);
705 PRINTK(("Read %d bytes\n", size));
706 skb->protocol=eth_type_trans(skb,dev);
707 netif_rx(skb); /* deliver it "upstairs" */
708 dev->last_rx = jiffies;
709 /* count all receives */
710 ((struct net_device_stats *)(dev->priv))->rx_packets++;
711 ((struct net_device_stats *)(dev->priv))->rx_bytes += size;
712 }
713 }
714
715 /* Let's peek ahead to see if we have read the last current packet */
716 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
717 curr_page = de620_get_register(dev, R_CPR);
718 de620_set_register(dev, W_NPRF, next_rx_page);
719 PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
720
721 return (next_rx_page != curr_page); /* That was slightly tricky... */
722 }
723 \f
724 /*********************************************
725 *
726 * Reset the adapter to a known state
727 *
728 */
729 static int adapter_init(struct net_device *dev)
730 {
731 int i;
732 static int was_down;
733
734 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
735 EIPRegister = NCTL0;
736 if (nic_data.Media != 1)
737 EIPRegister |= NIS0; /* not BNC */
738 }
739 else if (nic_data.Model == 2) { /* UTP */
740 EIPRegister = NCTL0 | NIS0;
741 }
742
743 if (utp)
744 EIPRegister = NCTL0 | NIS0;
745 if (bnc)
746 EIPRegister = NCTL0;
747
748 de620_send_command(dev, W_CR | RNOP | CLEAR);
749 de620_send_command(dev, W_CR | RNOP);
750
751 de620_set_register(dev, W_SCR, SCR_DEF);
752 /* disable recv to wait init */
753 de620_set_register(dev, W_TCR, RXOFF);
754
755 /* Set the node ID in the adapter */
756 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
757 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
758 }
759
760 de620_set_register(dev, W_EIP, EIPRegister);
761
762 next_rx_page = first_rx_page = DE620_RX_START_PAGE;
763 if (nic_data.RAM_Size)
764 last_rx_page = nic_data.RAM_Size - 1;
765 else /* 64k RAM */
766 last_rx_page = 255;
767
768 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
769 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
770 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
771 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
772 de620_send_command(dev, W_DUMMY);
773 de620_set_delay(dev);
774
775 /* Final sanity check: Anybody out there? */
776 /* Let's hope some bits from the statusregister make a good check */
777 #define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
778 #define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
779 /* success: X 0 0 X 0 0 X X */
780 /* ignore: EEDI RXGOOD COLS LNKS*/
781
782 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
783 printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
784 #ifdef SHUTDOWN_WHEN_LOST
785 " and do a new ifconfig"
786 #endif
787 "! (%02x)\n", dev->name, i);
788 #ifdef SHUTDOWN_WHEN_LOST
789 /* Goodbye, cruel world... */
790 dev->flags &= ~IFF_UP;
791 de620_close(dev);
792 #endif
793 was_down = 1;
794 return 1; /* failed */
795 }
796 if (was_down) {
797 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
798 was_down = 0;
799 }
800
801 /* All OK, go ahead... */
802 de620_set_register(dev, W_TCR, TCR_DEF);
803
804 return 0; /* all ok */
805 }
806 \f
807 /******************************************************************************
808 *
809 * Only start-up code below
810 *
811 */
812 /****************************************
813 *
814 * Check if there is a DE-620 connected
815 */
816 struct net_device * __init de620_probe(int unit)
817 {
818 byte checkbyte = 0xa5;
819 struct net_device *dev;
820 int err = -ENOMEM;
821 int i;
822
823 dev = alloc_etherdev(sizeof(struct net_device_stats));
824 if (!dev)
825 goto out;
826
827 SET_MODULE_OWNER(dev);
828
829 spin_lock_init(&de620_lock);
830
831 /*
832 * This is where the base_addr and irq gets set.
833 * Tunable at compile-time and insmod-time
834 */
835 dev->base_addr = io;
836 dev->irq = irq;
837
838 /* allow overriding parameters on command line */
839 if (unit >= 0) {
840 sprintf(dev->name, "eth%d", unit);
841 netdev_boot_setup_check(dev);
842 }
843
844 if (de620_debug)
845 printk(version);
846
847 printk(KERN_INFO "D-Link DE-620 pocket adapter");
848
849 if (!request_region(dev->base_addr, 3, "de620")) {
850 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
851 err = -EBUSY;
852 goto out1;
853 }
854
855 /* Initially, configure basic nibble mode, so we can read the EEPROM */
856 NIC_Cmd = DEF_NIC_CMD;
857 de620_set_register(dev, W_EIP, EIPRegister);
858
859 /* Anybody out there? */
860 de620_set_register(dev, W_CPR, checkbyte);
861 checkbyte = de620_get_register(dev, R_CPR);
862
863 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
864 printk(" not identified in the printer port\n");
865 err = -ENODEV;
866 goto out2;
867 }
868
869 /* else, got it! */
870 printk(", Ethernet Address: %2.2X",
871 dev->dev_addr[0] = nic_data.NodeID[0]);
872 for (i = 1; i < ETH_ALEN; i++) {
873 printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
874 dev->broadcast[i] = 0xff;
875 }
876
877 printk(" (%dk RAM,",
878 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
879
880 if (nic_data.Media == 1)
881 printk(" BNC)\n");
882 else
883 printk(" UTP)\n");
884
885 dev->get_stats = get_stats;
886 dev->open = de620_open;
887 dev->stop = de620_close;
888 dev->hard_start_xmit = de620_start_xmit;
889 dev->tx_timeout = de620_timeout;
890 dev->watchdog_timeo = HZ*2;
891 dev->set_multicast_list = de620_set_multicast_list;
892
893 /* base_addr and irq are already set, see above! */
894
895 /* dump eeprom */
896 if (de620_debug) {
897 printk("\nEEPROM contents:\n");
898 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
899 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
900 nic_data.NodeID[0], nic_data.NodeID[1],
901 nic_data.NodeID[2], nic_data.NodeID[3],
902 nic_data.NodeID[4], nic_data.NodeID[5]);
903 printk("Model = %d\n", nic_data.Model);
904 printk("Media = %d\n", nic_data.Media);
905 printk("SCR = 0x%02x\n", nic_data.SCR);
906 }
907
908 err = register_netdev(dev);
909 if (err)
910 goto out2;
911 return dev;
912
913 out2:
914 release_region(dev->base_addr, 3);
915 out1:
916 free_netdev(dev);
917 out:
918 return ERR_PTR(err);
919 }
920 \f
921 /**********************************
922 *
923 * Read info from on-board EEPROM
924 *
925 * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
926 */
927 #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
928
929 static unsigned short __init ReadAWord(struct net_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 __init read_eeprom(struct net_device *dev)
972 {
973 unsigned short wrd;
974
975 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
976 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
977 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
978 return -1; /* Nope, not a DE-620 */
979 nic_data.NodeID[0] = wrd & 0xff;
980 nic_data.NodeID[1] = wrd >> 8;
981
982 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
983 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
984 return -1; /* Nope, not a DE-620 */
985 nic_data.NodeID[2] = wrd & 0xff;
986 nic_data.NodeID[3] = wrd >> 8;
987
988 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
989 nic_data.NodeID[4] = wrd & 0xff;
990 nic_data.NodeID[5] = wrd >> 8;
991
992 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
993 nic_data.RAM_Size = (wrd >> 8);
994
995 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
996 nic_data.Model = (wrd & 0xff);
997
998 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
999 nic_data.Media = (wrd & 0xff);
1000
1001 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
1002 nic_data.SCR = (wrd >> 8);
1003
1004 return 0; /* no errors */
1005 }
1006 \f
1007 /******************************************************************************
1008 *
1009 * Loadable module skeleton
1010 *
1011 */
1012 #ifdef MODULE
1013 static struct net_device *de620_dev;
1014
1015 int init_module(void)
1016 {
1017 de620_dev = de620_probe(-1);
1018 if (IS_ERR(de620_dev))
1019 return PTR_ERR(de620_dev);
1020 return 0;
1021 }
1022
1023 void cleanup_module(void)
1024 {
1025 unregister_netdev(de620_dev);
1026 release_region(de620_dev->base_addr, 3);
1027 free_netdev(de620_dev);
1028 }
1029 #endif /* MODULE */
1030 MODULE_LICENSE("GPL");
1031
1032 \f
1033 /*
1034 * (add '-DMODULE' when compiling as loadable module)
1035 *
1036 * compile-command:
1037 * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1038 * -fomit-frame-pointer -m486 \
1039 * -I/usr/src/linux/include -I../../net/inet -c de620.c
1040 */
1041 /*
1042 * Local variables:
1043 * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1044 * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1045 * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1046 * End:
1047 */
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