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Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6-block.git] / drivers / net / de620.c
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1da177e4
LT		 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 *****************************************************************************/
41static const char version[] =
42 "de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n";
6aa20a22 43
1da177e4
LT		 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
6aa20a22 118
1da177e4
LT		 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
140typedef 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 */
183static int bnc;
184static int utp;
185static int io = DE620_IO;
186static int irq = DE620_IRQ;
187static int clone = DE620_CLONE;
188
189static unsigned int de620_debug = DE620_DEBUG;
190
191static spinlock_t de620_lock;
192
193module_param(bnc, int, 0);
194module_param(utp, int, 0);
195module_param(io, int, 0);
196module_param(irq, int, 0);
197module_param(clone, int, 0);
198module_param(de620_debug, int, 0);
199MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
200MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
201MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
202MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
203MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
204MODULE_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. */
217static int de620_open(struct net_device *);
218static int de620_close(struct net_device *);
219static struct net_device_stats *get_stats(struct net_device *);
220static void de620_set_multicast_list(struct net_device *);
221static int de620_start_xmit(struct sk_buff *, struct net_device *);
222
223/* Dispatch from interrupts. */
7d12e780 224static irqreturn_t de620_interrupt(int, void *);
1da177e4
LT		 225static int de620_rx_intr(struct net_device *);
226
227/* Initialization */
228static int adapter_init(struct net_device *);
229static 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
240static volatile byte NIC_Cmd;
241static volatile byte next_rx_page;
242static byte first_rx_page;
243static byte last_rx_page;
244static byte EIPRegister;
245
246static struct nic {
247 byte NodeID[6];
248 byte RAM_Size;
249 byte Model;
250 byte Media;
251 byte SCR;
252} nic_data;
6aa20a22 253
1da177e4
LT		 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
264static int tot_cnt;
265#endif
266static inline byte
267de620_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
281static inline void
282de620_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
295static inline void
296de620_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
304static inline byte
305de620_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
316static inline void
317de620_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
355static inline void
356de620_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
390static inline void
391de620_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
414static inline void
415de620_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
424static inline byte
425de620_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}
6aa20a22 435
1da177e4
LT		 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 */
445static 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
461out_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
472static 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 */
486static 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
498static 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/*******************************************************
6aa20a22 518 *
1da177e4
LT		 519 * Handle timeouts on transmit
520 */
6aa20a22 521
1da177e4
LT		 522static 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 */
535static 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 */
6aa20a22 543
1da177e4 544 netif_stop_queue(dev);
6aa20a22 545
1da177e4
LT		 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}
6aa20a22 587
1da177e4
LT		 588/*****************************************************
589 *
590 * Handle the network interface interrupts.
591 *
592 */
593static irqreturn_t
7d12e780 594de620_interrupt(int irq_in, void *dev_id)
1da177e4
LT		 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);
6aa20a22 602
1da177e4
LT		 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);
6aa20a22 618
1da177e4
LT		 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 */
630static 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 */
1da177e4
LT		 700 /* skb->data points to the start of sk_buff data area */
701 buffer = skb_put(skb,size);
702 /* copy the packet into the buffer */
703 de620_read_block(dev, buffer, size);
704 PRINTK(("Read %d bytes\n", size));
705 skb->protocol=eth_type_trans(skb,dev);
706 netif_rx(skb); /* deliver it "upstairs" */
707 dev->last_rx = jiffies;
708 /* count all receives */
709 ((struct net_device_stats *)(dev->priv))->rx_packets++;
710 ((struct net_device_stats *)(dev->priv))->rx_bytes += size;
711 }
712 }
713
714 /* Let's peek ahead to see if we have read the last current packet */
715 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
716 curr_page = de620_get_register(dev, R_CPR);
717 de620_set_register(dev, W_NPRF, next_rx_page);
718 PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
719
720 return (next_rx_page != curr_page); /* That was slightly tricky... */
721}
6aa20a22 722
1da177e4
LT		 723/*********************************************
724 *
725 * Reset the adapter to a known state
726 *
727 */
728static int adapter_init(struct net_device *dev)
729{
730 int i;
731 static int was_down;
732
733 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
734 EIPRegister = NCTL0;
735 if (nic_data.Media != 1)
736 EIPRegister |= NIS0; /* not BNC */
737 }
738 else if (nic_data.Model == 2) { /* UTP */
739 EIPRegister = NCTL0 | NIS0;
740 }
741
742 if (utp)
743 EIPRegister = NCTL0 | NIS0;
744 if (bnc)
745 EIPRegister = NCTL0;
746
747 de620_send_command(dev, W_CR | RNOP | CLEAR);
748 de620_send_command(dev, W_CR | RNOP);
749
750 de620_set_register(dev, W_SCR, SCR_DEF);
751 /* disable recv to wait init */
752 de620_set_register(dev, W_TCR, RXOFF);
753
754 /* Set the node ID in the adapter */
755 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
756 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
757 }
758
759 de620_set_register(dev, W_EIP, EIPRegister);
760
761 next_rx_page = first_rx_page = DE620_RX_START_PAGE;
762 if (nic_data.RAM_Size)
763 last_rx_page = nic_data.RAM_Size - 1;
764 else /* 64k RAM */
765 last_rx_page = 255;
766
767 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
768 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
769 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
770 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
771 de620_send_command(dev, W_DUMMY);
772 de620_set_delay(dev);
773
774 /* Final sanity check: Anybody out there? */
775 /* Let's hope some bits from the statusregister make a good check */
776#define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
777#define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
778 /* success: X 0 0 X 0 0 X X */
779 /* ignore: EEDI RXGOOD COLS LNKS*/
780
781 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
782 printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
783#ifdef SHUTDOWN_WHEN_LOST
784 " and do a new ifconfig"
785#endif
786 "! (%02x)\n", dev->name, i);
787#ifdef SHUTDOWN_WHEN_LOST
788 /* Goodbye, cruel world... */
789 dev->flags &= ~IFF_UP;
790 de620_close(dev);
791#endif
792 was_down = 1;
793 return 1; /* failed */
794 }
795 if (was_down) {
796 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
797 was_down = 0;
798 }
799
800 /* All OK, go ahead... */
801 de620_set_register(dev, W_TCR, TCR_DEF);
802
803 return 0; /* all ok */
804}
6aa20a22 805
1da177e4
LT		 806/******************************************************************************
807 *
808 * Only start-up code below
809 *
810 */
811/****************************************
812 *
813 * Check if there is a DE-620 connected
814 */
815struct net_device * __init de620_probe(int unit)
816{
817 byte checkbyte = 0xa5;
818 struct net_device *dev;
819 int err = -ENOMEM;
820 int i;
821
822 dev = alloc_etherdev(sizeof(struct net_device_stats));
823 if (!dev)
824 goto out;
825
826 SET_MODULE_OWNER(dev);
827
828 spin_lock_init(&de620_lock);
6aa20a22 829
1da177e4
LT		 830 /*
831 * This is where the base_addr and irq gets set.
832 * Tunable at compile-time and insmod-time
833 */
834 dev->base_addr = io;
835 dev->irq = irq;
836
837 /* allow overriding parameters on command line */
838 if (unit >= 0) {
839 sprintf(dev->name, "eth%d", unit);
840 netdev_boot_setup_check(dev);
841 }
6aa20a22 842
1da177e4
LT		 843 if (de620_debug)
844 printk(version);
845
846 printk(KERN_INFO "D-Link DE-620 pocket adapter");
847
848 if (!request_region(dev->base_addr, 3, "de620")) {
849 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
850 err = -EBUSY;
851 goto out1;
852 }
853
854 /* Initially, configure basic nibble mode, so we can read the EEPROM */
855 NIC_Cmd = DEF_NIC_CMD;
856 de620_set_register(dev, W_EIP, EIPRegister);
857
858 /* Anybody out there? */
859 de620_set_register(dev, W_CPR, checkbyte);
860 checkbyte = de620_get_register(dev, R_CPR);
861
862 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
863 printk(" not identified in the printer port\n");
864 err = -ENODEV;
865 goto out2;
866 }
867
868 /* else, got it! */
869 printk(", Ethernet Address: %2.2X",
870 dev->dev_addr[0] = nic_data.NodeID[0]);
871 for (i = 1; i < ETH_ALEN; i++) {
872 printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
873 dev->broadcast[i] = 0xff;
874 }
875
876 printk(" (%dk RAM,",
877 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
878
879 if (nic_data.Media == 1)
880 printk(" BNC)\n");
881 else
882 printk(" UTP)\n");
883
884 dev->get_stats = get_stats;
885 dev->open = de620_open;
886 dev->stop = de620_close;
887 dev->hard_start_xmit = de620_start_xmit;
888 dev->tx_timeout = de620_timeout;
889 dev->watchdog_timeo = HZ*2;
890 dev->set_multicast_list = de620_set_multicast_list;
6aa20a22 891
1da177e4
LT		 892 /* base_addr and irq are already set, see above! */
893
894 /* dump eeprom */
895 if (de620_debug) {
896 printk("\nEEPROM contents:\n");
897 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
898 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
899 nic_data.NodeID[0], nic_data.NodeID[1],
900 nic_data.NodeID[2], nic_data.NodeID[3],
901 nic_data.NodeID[4], nic_data.NodeID[5]);
902 printk("Model = %d\n", nic_data.Model);
903 printk("Media = %d\n", nic_data.Media);
904 printk("SCR = 0x%02x\n", nic_data.SCR);
905 }
906
907 err = register_netdev(dev);
908 if (err)
909 goto out2;
910 return dev;
911
912out2:
913 release_region(dev->base_addr, 3);
914out1:
915 free_netdev(dev);
916out:
917 return ERR_PTR(err);
918}
6aa20a22 919
1da177e4
LT		 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
928static unsigned short __init ReadAWord(struct net_device *dev, int from)
929{
930 unsigned short data;
931 int nbits;
932
933 /* cs [__~~] SET SEND STATE */
934 /* di [____] */
935 /* sck [_~~_] */
936 sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
937
938 /* Send the 9-bit address from where we want to read the 16-bit word */
939 for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
940 if (from & 0x0100) { /* bit set? */
941 /* cs [~~~~] SEND 1 */
942 /* di [~~~~] */
943 /* sck [_~~_] */
944 sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
945 }
946 else {
947 /* cs [~~~~] SEND 0 */
948 /* di [____] */
949 /* sck [_~~_] */
950 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
951 }
952 }
953
954 /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
955 for (data = 0, nbits = 16; nbits > 0; --nbits) {
956 /* cs [~~~~] SEND 0 */
957 /* di [____] */
958 /* sck [_~~_] */
959 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
960 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
961 }
962 /* cs [____] RESET SEND STATE */
963 /* di [____] */
964 /* sck [_~~_] */
965 sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
966
967 return data;
968}
969
970static int __init read_eeprom(struct net_device *dev)
971{
972 unsigned short wrd;
973
974 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
975 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
976 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
977 return -1; /* Nope, not a DE-620 */
978 nic_data.NodeID[0] = wrd & 0xff;
979 nic_data.NodeID[1] = wrd >> 8;
980
981 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
982 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
983 return -1; /* Nope, not a DE-620 */
984 nic_data.NodeID[2] = wrd & 0xff;
985 nic_data.NodeID[3] = wrd >> 8;
986
987 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
988 nic_data.NodeID[4] = wrd & 0xff;
989 nic_data.NodeID[5] = wrd >> 8;
990
991 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
992 nic_data.RAM_Size = (wrd >> 8);
993
994 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
995 nic_data.Model = (wrd & 0xff);
996
997 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
998 nic_data.Media = (wrd & 0xff);
999
1000 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
1001 nic_data.SCR = (wrd >> 8);
1002
1003 return 0; /* no errors */
1004}
6aa20a22 1005
1da177e4
LT		 1006/******************************************************************************
1007 *
1008 * Loadable module skeleton
1009 *
1010 */
1011#ifdef MODULE
1012static struct net_device *de620_dev;
1013
b2cba5b5 1014int __init init_module(void)
1da177e4
LT		 1015{
1016 de620_dev = de620_probe(-1);
1017 if (IS_ERR(de620_dev))
1018 return PTR_ERR(de620_dev);
1019 return 0;
1020}
1021
1022void cleanup_module(void)
1023{
1024 unregister_netdev(de620_dev);
1025 release_region(de620_dev->base_addr, 3);
1026 free_netdev(de620_dev);
1027}
1028#endif /* MODULE */
1029MODULE_LICENSE("GPL");
1030
6aa20a22 1031
1da177e4
LT		 1032/*
1033 * (add '-DMODULE' when compiling as loadable module)
1034 *
1035 * compile-command:
1036 * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1037 * -fomit-frame-pointer -m486 \
1038 * -I/usr/src/linux/include -I../../net/inet -c de620.c
1039*/
1040/*
1041 * Local variables:
1042 * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1043 * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1044 * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1045 * End:
1046 */
Linux 6.x block layer and io_uring tree(s)