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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 *);
1da177e4
LT		 219static void de620_set_multicast_list(struct net_device *);
220static int de620_start_xmit(struct sk_buff *, struct net_device *);
221
222/* Dispatch from interrupts. */
7d12e780 223static irqreturn_t de620_interrupt(int, void *);
1da177e4
LT		 224static int de620_rx_intr(struct net_device *);
225
226/* Initialization */
227static int adapter_init(struct net_device *);
228static int read_eeprom(struct net_device *);
229
230
231/*
232 * D-Link driver variables:
233 */
234#define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
235#define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */
236#define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */
237#define DEF_NIC_CMD IRQEN | ICEN | DS1
238
239static volatile byte NIC_Cmd;
240static volatile byte next_rx_page;
241static byte first_rx_page;
242static byte last_rx_page;
243static byte EIPRegister;
244
245static struct nic {
246 byte NodeID[6];
247 byte RAM_Size;
248 byte Model;
249 byte Media;
250 byte SCR;
251} nic_data;
6aa20a22 252
1da177e4
LT		 253/**********************************************************
254 * *
255 * Convenience macros/functions for D-Link DE-620 adapter *
256 * *
257 **********************************************************/
258#define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
259#define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
260
261/* Check for ready-status, and return a nibble (high 4 bits) for data input */
262#ifdef COUNT_LOOPS
263static int tot_cnt;
264#endif
265static inline byte
266de620_ready(struct net_device *dev)
267{
268 byte value;
269 register short int cnt = 0;
270
271 while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
272 ++cnt;
273
274#ifdef COUNT_LOOPS
275 tot_cnt += cnt;
276#endif
277 return value & 0xf0; /* nibble */
278}
279
280static inline void
281de620_send_command(struct net_device *dev, byte cmd)
282{
283 de620_ready(dev);
284 if (cmd == W_DUMMY)
285 outb(NIC_Cmd, COMMAND_PORT);
286
287 outb(cmd, DATA_PORT);
288
289 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
290 de620_ready(dev);
291 outb(NIC_Cmd, COMMAND_PORT);
292}
293
294static inline void
295de620_put_byte(struct net_device *dev, byte value)
296{
297 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
298 de620_ready(dev);
299 outb(value, DATA_PORT);
300 de620_flip_ds(dev);
301}
302
303static inline byte
304de620_read_byte(struct net_device *dev)
305{
306 byte value;
307
308 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
309 value = de620_ready(dev); /* High nibble */
310 de620_flip_ds(dev);
311 value |= de620_ready(dev) >> 4; /* Low nibble */
312 return value;
313}
314
315static inline void
316de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
317{
318#ifndef LOWSPEED
319 byte uflip = NIC_Cmd ^ (DS0 | DS1);
320 byte dflip = NIC_Cmd;
321#else /* LOWSPEED */
322#ifdef COUNT_LOOPS
323 int bytes = count;
324#endif /* COUNT_LOOPS */
325#endif /* LOWSPEED */
326
327#ifdef LOWSPEED
328#ifdef COUNT_LOOPS
329 tot_cnt = 0;
330#endif /* COUNT_LOOPS */
331 /* No further optimization useful, the limit is in the adapter. */
332 for ( ; count > 0; --count, ++buffer) {
333 de620_put_byte(dev,*buffer);
334 }
335 for ( count = pad ; count > 0; --count, ++buffer) {
336 de620_put_byte(dev, 0);
337 }
338 de620_send_command(dev,W_DUMMY);
339#ifdef COUNT_LOOPS
340 /* trial debug output: loops per byte in de620_ready() */
341 printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
342#endif /* COUNT_LOOPS */
343#else /* not LOWSPEED */
344 for ( ; count > 0; count -=2) {
345 outb(*buffer++, DATA_PORT);
346 outb(uflip, COMMAND_PORT);
347 outb(*buffer++, DATA_PORT);
348 outb(dflip, COMMAND_PORT);
349 }
350 de620_send_command(dev,W_DUMMY);
351#endif /* LOWSPEED */
352}
353
354static inline void
355de620_read_block(struct net_device *dev, byte *data, int count)
356{
357#ifndef LOWSPEED
358 byte value;
359 byte uflip = NIC_Cmd ^ (DS0 | DS1);
360 byte dflip = NIC_Cmd;
361#else /* LOWSPEED */
362#ifdef COUNT_LOOPS
363 int bytes = count;
364
365 tot_cnt = 0;
366#endif /* COUNT_LOOPS */
367#endif /* LOWSPEED */
368
369#ifdef LOWSPEED
370 /* No further optimization useful, the limit is in the adapter. */
371 while (count-- > 0) {
372 *data++ = de620_read_byte(dev);
373 de620_flip_ds(dev);
374 }
375#ifdef COUNT_LOOPS
376 /* trial debug output: loops per byte in de620_ready() */
377 printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
378#endif /* COUNT_LOOPS */
379#else /* not LOWSPEED */
380 while (count-- > 0) {
381 value = inb(STATUS_PORT) & 0xf0; /* High nibble */
382 outb(uflip, COMMAND_PORT);
383 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
384 outb(dflip , COMMAND_PORT);
385 }
386#endif /* LOWSPEED */
387}
388
389static inline void
390de620_set_delay(struct net_device *dev)
391{
392 de620_ready(dev);
393 outb(W_DFR, DATA_PORT);
394 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
395
396 de620_ready(dev);
397#ifdef LOWSPEED
398 outb(WRITE_DELAY, DATA_PORT);
399#else
400 outb(0, DATA_PORT);
401#endif
402 de620_flip_ds(dev);
403
404 de620_ready(dev);
405#ifdef LOWSPEED
406 outb(READ_DELAY, DATA_PORT);
407#else
408 outb(0, DATA_PORT);
409#endif
410 de620_flip_ds(dev);
411}
412
413static inline void
414de620_set_register(struct net_device *dev, byte reg, byte value)
415{
416 de620_ready(dev);
417 outb(reg, DATA_PORT);
418 outb(NIC_Cmd ^ CS0, COMMAND_PORT);
419
420 de620_put_byte(dev, value);
421}
422
423static inline byte
424de620_get_register(struct net_device *dev, byte reg)
425{
426 byte value;
427
428 de620_send_command(dev,reg);
429 value = de620_read_byte(dev);
430 de620_send_command(dev,W_DUMMY);
431
432 return value;
433}
6aa20a22 434
1da177e4
LT		 435/*********************************************************************
436 *
437 * Open/initialize the board.
438 *
439 * This routine should set everything up anew at each open, even
440 * registers that "should" only need to be set once at boot, so that
441 * there is a non-reboot way to recover if something goes wrong.
442 *
443 */
444static int de620_open(struct net_device *dev)
445{
446 int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
447 if (ret) {
448 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
449 return ret;
450 }
451
452 if (adapter_init(dev)) {
453 ret = -EIO;
454 goto out_free_irq;
455 }
456
457 netif_start_queue(dev);
458 return 0;
459
460out_free_irq:
461 free_irq(dev->irq, dev);
462 return ret;
463}
464
465/************************************************
466 *
467 * The inverse routine to de620_open().
468 *
469 */
470
471static int de620_close(struct net_device *dev)
472{
473 netif_stop_queue(dev);
474 /* disable recv */
475 de620_set_register(dev, W_TCR, RXOFF);
476 free_irq(dev->irq, dev);
477 return 0;
478}
479
1da177e4
LT		 480/*********************************************
481 *
482 * Set or clear the multicast filter for this adaptor.
483 * (no real multicast implemented for the DE-620, but she can be promiscuous...)
484 *
485 */
486
487static void de620_set_multicast_list(struct net_device *dev)
488{
489 if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
490 { /* Enable promiscuous mode */
491 /*
492 * We must make the kernel realise we had to move
493 * into promisc mode or we start all out war on
494 * the cable. - AC
495 */
496 dev->flags|=IFF_PROMISC;
497
498 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
499 }
500 else
501 { /* Disable promiscuous mode, use normal mode */
502 de620_set_register(dev, W_TCR, TCR_DEF);
503 }
504}
505
506/*******************************************************
6aa20a22 507 *
1da177e4
LT		 508 * Handle timeouts on transmit
509 */
6aa20a22 510
1da177e4
LT		 511static void de620_timeout(struct net_device *dev)
512{
513 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
514 /* Restart the adapter. */
515 if (!adapter_init(dev)) /* maybe close it */
516 netif_wake_queue(dev);
517}
518
519/*******************************************************
520 *
521 * Copy a buffer to the adapter transmit page memory.
522 * Start sending.
523 */
524static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
525{
526 unsigned long flags;
527 int len;
528 byte *buffer = skb->data;
529 byte using_txbuf;
530
531 using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
6aa20a22 532
1da177e4 533 netif_stop_queue(dev);
6aa20a22 534
1da177e4
LT		 535
536 if ((len = skb->len) < RUNT)
537 len = RUNT;
538 if (len & 1) /* send an even number of bytes */
539 ++len;
540
541 /* Start real output */
542
543 spin_lock_irqsave(&de620_lock, flags)
544 PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
545 (int)skb->len, using_txbuf));
546
547 /* select a free tx buffer. if there is one... */
548 switch (using_txbuf) {
549 default: /* both are free: use TXBF0 */
550 case TXBF1: /* use TXBF0 */
551 de620_send_command(dev,W_CR | RW0);
552 using_txbuf |= TXBF0;
553 break;
554
555 case TXBF0: /* use TXBF1 */
556 de620_send_command(dev,W_CR | RW1);
557 using_txbuf |= TXBF1;
558 break;
559
560 case (TXBF0 | TXBF1): /* NONE!!! */
561 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
562 spin_unlock_irqrestore(&de620_lock, flags);
563 return 1;
564 }
565 de620_write_block(dev, buffer, skb->len, len-skb->len);
566
567 dev->trans_start = jiffies;
568 if(!(using_txbuf == (TXBF0 | TXBF1)))
569 netif_wake_queue(dev);
570
09f75cd7 571 dev->stats.tx_packets++;
1da177e4
LT		 572 spin_unlock_irqrestore(&de620_lock, flags);
573 dev_kfree_skb (skb);
574 return 0;
575}
6aa20a22 576
1da177e4
LT		 577/*****************************************************
578 *
579 * Handle the network interface interrupts.
580 *
581 */
582static irqreturn_t
7d12e780 583de620_interrupt(int irq_in, void *dev_id)
1da177e4
LT		 584{
585 struct net_device *dev = dev_id;
586 byte irq_status;
587 int bogus_count = 0;
588 int again = 0;
589
590 spin_lock(&de620_lock);
6aa20a22 591
1da177e4
LT		 592 /* Read the status register (_not_ the status port) */
593 irq_status = de620_get_register(dev, R_STS);
594
595 PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
596
597 if (irq_status & RXGOOD) {
598 do {
599 again = de620_rx_intr(dev);
600 PRINTK(("again=%d\n", again));
601 }
602 while (again && (++bogus_count < 100));
603 }
604
605 if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
606 netif_wake_queue(dev);
6aa20a22 607
1da177e4
LT		 608 spin_unlock(&de620_lock);
609 return IRQ_HANDLED;
610}
611
612/**************************************
613 *
614 * Get a packet from the adapter
615 *
616 * Send it "upstairs"
617 *
618 */
619static int de620_rx_intr(struct net_device *dev)
620{
621 struct header_buf {
622 byte status;
623 byte Rx_NextPage;
624 unsigned short Rx_ByteCount;
625 } header_buf;
626 struct sk_buff *skb;
627 int size;
628 byte *buffer;
629 byte pagelink;
630 byte curr_page;
631
632 PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
633
634 /* Tell the adapter that we are going to read data, and from where */
635 de620_send_command(dev, W_CR | RRN);
636 de620_set_register(dev, W_RSA1, next_rx_page);
637 de620_set_register(dev, W_RSA0, 0);
638
639 /* Deep breath, and away we goooooo */
640 de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
641 PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
642 header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
643
644 /* Plausible page header? */
645 pagelink = header_buf.Rx_NextPage;
646 if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
647 /* Ouch... Forget it! Skip all and start afresh... */
648 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
649 /* You win some, you lose some. And sometimes plenty... */
650 adapter_init(dev);
651 netif_wake_queue(dev);
09f75cd7 652 dev->stats.rx_over_errors++;
1da177e4
LT		 653 return 0;
654 }
655
656 /* OK, this look good, so far. Let's see if it's consistent... */
657 /* Let's compute the start of the next packet, based on where we are */
658 pagelink = next_rx_page +
659 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
660
661 /* Are we going to wrap around the page counter? */
662 if (pagelink > last_rx_page)
663 pagelink -= (last_rx_page - first_rx_page + 1);
664
665 /* Is the _computed_ next page number equal to what the adapter says? */
666 if (pagelink != header_buf.Rx_NextPage) {
667 /* Naah, we'll skip this packet. Probably bogus data as well */
668 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
669 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
670 de620_send_command(dev, W_DUMMY);
671 de620_set_register(dev, W_NPRF, next_rx_page);
09f75cd7 672 dev->stats.rx_over_errors++;
1da177e4
LT		 673 return 0;
674 }
675 next_rx_page = pagelink;
676
677 size = header_buf.Rx_ByteCount - 4;
678 if ((size < RUNT) || (GIANT < size)) {
679 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
680 }
681 else { /* Good packet? */
682 skb = dev_alloc_skb(size+2);
683 if (skb == NULL) { /* Yeah, but no place to put it... */
684 printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
09f75cd7 685 dev->stats.rx_dropped++;
1da177e4
LT		 686 }
687 else { /* Yep! Go get it! */
688 skb_reserve(skb,2); /* Align */
1da177e4
LT		 689 /* skb->data points to the start of sk_buff data area */
690 buffer = skb_put(skb,size);
691 /* copy the packet into the buffer */
692 de620_read_block(dev, buffer, size);
693 PRINTK(("Read %d bytes\n", size));
694 skb->protocol=eth_type_trans(skb,dev);
695 netif_rx(skb); /* deliver it "upstairs" */
696 dev->last_rx = jiffies;
697 /* count all receives */
09f75cd7
JG		 698 dev->stats.rx_packets++;
699 dev->stats.rx_bytes += size;
1da177e4
LT		 700 }
701 }
702
703 /* Let's peek ahead to see if we have read the last current packet */
704 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
705 curr_page = de620_get_register(dev, R_CPR);
706 de620_set_register(dev, W_NPRF, next_rx_page);
707 PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
708
709 return (next_rx_page != curr_page); /* That was slightly tricky... */
710}
6aa20a22 711
1da177e4
LT		 712/*********************************************
713 *
714 * Reset the adapter to a known state
715 *
716 */
717static int adapter_init(struct net_device *dev)
718{
719 int i;
720 static int was_down;
721
722 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
723 EIPRegister = NCTL0;
724 if (nic_data.Media != 1)
725 EIPRegister |= NIS0; /* not BNC */
726 }
727 else if (nic_data.Model == 2) { /* UTP */
728 EIPRegister = NCTL0 | NIS0;
729 }
730
731 if (utp)
732 EIPRegister = NCTL0 | NIS0;
733 if (bnc)
734 EIPRegister = NCTL0;
735
736 de620_send_command(dev, W_CR | RNOP | CLEAR);
737 de620_send_command(dev, W_CR | RNOP);
738
739 de620_set_register(dev, W_SCR, SCR_DEF);
740 /* disable recv to wait init */
741 de620_set_register(dev, W_TCR, RXOFF);
742
743 /* Set the node ID in the adapter */
744 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
745 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
746 }
747
748 de620_set_register(dev, W_EIP, EIPRegister);
749
750 next_rx_page = first_rx_page = DE620_RX_START_PAGE;
751 if (nic_data.RAM_Size)
752 last_rx_page = nic_data.RAM_Size - 1;
753 else /* 64k RAM */
754 last_rx_page = 255;
755
756 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
757 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
758 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
759 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
760 de620_send_command(dev, W_DUMMY);
761 de620_set_delay(dev);
762
763 /* Final sanity check: Anybody out there? */
764 /* Let's hope some bits from the statusregister make a good check */
765#define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
766#define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
767 /* success: X 0 0 X 0 0 X X */
768 /* ignore: EEDI RXGOOD COLS LNKS*/
769
770 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
771 printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
772#ifdef SHUTDOWN_WHEN_LOST
773 " and do a new ifconfig"
774#endif
775 "! (%02x)\n", dev->name, i);
776#ifdef SHUTDOWN_WHEN_LOST
777 /* Goodbye, cruel world... */
778 dev->flags &= ~IFF_UP;
779 de620_close(dev);
780#endif
781 was_down = 1;
782 return 1; /* failed */
783 }
784 if (was_down) {
785 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
786 was_down = 0;
787 }
788
789 /* All OK, go ahead... */
790 de620_set_register(dev, W_TCR, TCR_DEF);
791
792 return 0; /* all ok */
793}
6aa20a22 794
1da177e4
LT		 795/******************************************************************************
796 *
797 * Only start-up code below
798 *
799 */
800/****************************************
801 *
802 * Check if there is a DE-620 connected
803 */
804struct net_device * __init de620_probe(int unit)
805{
806 byte checkbyte = 0xa5;
807 struct net_device *dev;
808 int err = -ENOMEM;
809 int i;
0795af57 810 DECLARE_MAC_BUF(mac);
1da177e4 811
09f75cd7 812 dev = alloc_etherdev(0);
1da177e4
LT		 813 if (!dev)
814 goto out;
815
1da177e4 816 spin_lock_init(&de620_lock);
6aa20a22 817
1da177e4
LT		 818 /*
819 * This is where the base_addr and irq gets set.
820 * Tunable at compile-time and insmod-time
821 */
822 dev->base_addr = io;
823 dev->irq = irq;
824
825 /* allow overriding parameters on command line */
826 if (unit >= 0) {
827 sprintf(dev->name, "eth%d", unit);
828 netdev_boot_setup_check(dev);
829 }
6aa20a22 830
1da177e4
LT		 831 if (de620_debug)
832 printk(version);
833
834 printk(KERN_INFO "D-Link DE-620 pocket adapter");
835
836 if (!request_region(dev->base_addr, 3, "de620")) {
837 printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
838 err = -EBUSY;
839 goto out1;
840 }
841
842 /* Initially, configure basic nibble mode, so we can read the EEPROM */
843 NIC_Cmd = DEF_NIC_CMD;
844 de620_set_register(dev, W_EIP, EIPRegister);
845
846 /* Anybody out there? */
847 de620_set_register(dev, W_CPR, checkbyte);
848 checkbyte = de620_get_register(dev, R_CPR);
849
850 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
851 printk(" not identified in the printer port\n");
852 err = -ENODEV;
853 goto out2;
854 }
855
856 /* else, got it! */
0795af57 857 dev->dev_addr[0] = nic_data.NodeID[0];
1da177e4 858 for (i = 1; i < ETH_ALEN; i++) {
0795af57 859 dev->dev_addr[i] = nic_data.NodeID[i];
1da177e4
LT		 860 dev->broadcast[i] = 0xff;
861 }
862
0795af57
JP		 863 printk(", Ethernet Address: %s", print_mac(mac, dev->dev_addr));
864
1da177e4
LT		 865 printk(" (%dk RAM,",
866 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
867
868 if (nic_data.Media == 1)
869 printk(" BNC)\n");
870 else
871 printk(" UTP)\n");
872
1da177e4
LT		 873 dev->open = de620_open;
874 dev->stop = de620_close;
875 dev->hard_start_xmit = de620_start_xmit;
876 dev->tx_timeout = de620_timeout;
877 dev->watchdog_timeo = HZ*2;
878 dev->set_multicast_list = de620_set_multicast_list;
6aa20a22 879
1da177e4
LT		 880 /* base_addr and irq are already set, see above! */
881
882 /* dump eeprom */
883 if (de620_debug) {
884 printk("\nEEPROM contents:\n");
885 printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
886 printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
887 nic_data.NodeID[0], nic_data.NodeID[1],
888 nic_data.NodeID[2], nic_data.NodeID[3],
889 nic_data.NodeID[4], nic_data.NodeID[5]);
890 printk("Model = %d\n", nic_data.Model);
891 printk("Media = %d\n", nic_data.Media);
892 printk("SCR = 0x%02x\n", nic_data.SCR);
893 }
894
895 err = register_netdev(dev);
896 if (err)
897 goto out2;
898 return dev;
899
900out2:
901 release_region(dev->base_addr, 3);
902out1:
903 free_netdev(dev);
904out:
905 return ERR_PTR(err);
906}
6aa20a22 907
1da177e4
LT		 908/**********************************
909 *
910 * Read info from on-board EEPROM
911 *
912 * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
913 */
914#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
915
916static unsigned short __init ReadAWord(struct net_device *dev, int from)
917{
918 unsigned short data;
919 int nbits;
920
921 /* cs [__~~] SET SEND STATE */
922 /* di [____] */
923 /* sck [_~~_] */
924 sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
925
926 /* Send the 9-bit address from where we want to read the 16-bit word */
927 for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
928 if (from & 0x0100) { /* bit set? */
929 /* cs [~~~~] SEND 1 */
930 /* di [~~~~] */
931 /* sck [_~~_] */
932 sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
933 }
934 else {
935 /* cs [~~~~] SEND 0 */
936 /* di [____] */
937 /* sck [_~~_] */
938 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
939 }
940 }
941
942 /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
943 for (data = 0, nbits = 16; nbits > 0; --nbits) {
944 /* cs [~~~~] SEND 0 */
945 /* di [____] */
946 /* sck [_~~_] */
947 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
948 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
949 }
950 /* cs [____] RESET SEND STATE */
951 /* di [____] */
952 /* sck [_~~_] */
953 sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
954
955 return data;
956}
957
958static int __init read_eeprom(struct net_device *dev)
959{
960 unsigned short wrd;
961
962 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
963 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
964 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
965 return -1; /* Nope, not a DE-620 */
966 nic_data.NodeID[0] = wrd & 0xff;
967 nic_data.NodeID[1] = wrd >> 8;
968
969 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
970 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
971 return -1; /* Nope, not a DE-620 */
972 nic_data.NodeID[2] = wrd & 0xff;
973 nic_data.NodeID[3] = wrd >> 8;
974
975 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
976 nic_data.NodeID[4] = wrd & 0xff;
977 nic_data.NodeID[5] = wrd >> 8;
978
979 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
980 nic_data.RAM_Size = (wrd >> 8);
981
982 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
983 nic_data.Model = (wrd & 0xff);
984
985 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
986 nic_data.Media = (wrd & 0xff);
987
988 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
989 nic_data.SCR = (wrd >> 8);
990
991 return 0; /* no errors */
992}
6aa20a22 993
1da177e4
LT		 994/******************************************************************************
995 *
996 * Loadable module skeleton
997 *
998 */
999#ifdef MODULE
1000static struct net_device *de620_dev;
1001
b2cba5b5 1002int __init init_module(void)
1da177e4
LT		 1003{
1004 de620_dev = de620_probe(-1);
1005 if (IS_ERR(de620_dev))
1006 return PTR_ERR(de620_dev);
1007 return 0;
1008}
1009
1010void cleanup_module(void)
1011{
1012 unregister_netdev(de620_dev);
1013 release_region(de620_dev->base_addr, 3);
1014 free_netdev(de620_dev);
1015}
1016#endif /* MODULE */
1017MODULE_LICENSE("GPL");
1018
6aa20a22 1019
1da177e4
LT		 1020/*
1021 * (add '-DMODULE' when compiling as loadable module)
1022 *
1023 * compile-command:
1024 * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
1025 * -fomit-frame-pointer -m486 \
1026 * -I/usr/src/linux/include -I../../net/inet -c de620.c
1027*/
1028/*
1029 * Local variables:
1030 * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1031 * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1032 * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
1033 * End:
1034 */
Linux 6.x block layer and io_uring tree(s)