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*/
1 static const char *version =
2 "de600.c: $Revision: 1.40 $, Bjorn Ekwall (bj0rn@blox.se)\n";
3 /*
4 * de600.c
5 *
6 * Linux driver for the D-Link DE-600 Ethernet pocket adapter.
7 *
8 * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
9 * The Author may be reached as bj0rn@blox.se
10 *
11 * Based on adapter information gathered from DE600.ASM by D-Link Inc.,
12 * as included on disk C in the v.2.11 of PC/TCP from FTP Software.
13 * For DE600.asm:
14 * Portions (C) Copyright 1990 D-Link, Inc.
15 * Copyright, 1988-1992, Russell Nelson, Crynwr Software
16 *
17 * Adapted to the sample network driver core for linux,
18 * written by: Donald Becker <becker@super.org>
19 * C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
20 *
21 * compile-command:
22 * "gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer \
23 * -m486 -c de600.c
24 *
25 **************************************************************/
26 /*
27 * This program is free software; you can redistribute it and/or modify
28 * it under the terms of the GNU General Public License as published by
29 * the Free Software Foundation; either version 2, or (at your option)
30 * any later version.
31 *
32 * This program is distributed in the hope that it will be useful,
33 * but WITHOUT ANY WARRANTY; without even the implied warranty of
34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
35 * GNU General Public License for more details.
36 *
37 * You should have received a copy of the GNU General Public License
38 * along with this program; if not, write to the Free Software
39 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
40 *
41 **************************************************************/
42 /* Add another "; SLOW_DOWN_IO" here if your adapter won't work OK: */
43 #define DE600_SLOW_DOWN SLOW_DOWN_IO; SLOW_DOWN_IO; SLOW_DOWN_IO
44
45 /*
46 * If you still have trouble reading/writing to the adapter,
47 * modify the following "#define": (see <asm/io.h> for more info)
48 #define REALLY_SLOW_IO
49 */
50 #define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
51
52 /*
53 * If you want to enable automatic continuous checking for the DE600,
54 * keep this #define enabled.
55 * It doesn't cost much per packet, so I think it is worth it!
56 * If you disagree, comment away the #define, and live with it...
57 *
58 */
59 #define CHECK_LOST_DE600
60
61 /*
62 * Enable this #define if you want the adapter to do a "ifconfig down" on
63 * itself when we have detected that something is possibly wrong with it.
64 * The default behaviour is to retry with "adapter_init()" until success.
65 * This should be used for debugging purposes only.
66 * (Depends on the CHECK_LOST_DE600 above)
67 *
68 */
69 #define SHUTDOWN_WHEN_LOST
70
71 /*
72 * See comment at "de600_rspace()"!
73 * This is an *ugly* hack, but for now it achieves its goal of
74 * faking a TCP flow-control that will not flood the poor DE600.
75 *
76 * Tricks TCP to announce a small max window (max 2 fast packets please :-)
77 *
78 * Comment away at your own risk!
79 *
80 * Update: Use the more general per-device maxwindow parameter instead.
81 */
82 #undef FAKE_SMALL_MAX
83
84 /* use 0 for production, 1 for verification, >2 for debug */
85 #ifdef DE600_DEBUG
86 #define PRINTK(x) if (de600_debug >= 2) printk x
87 #else
88 #define DE600_DEBUG 0
89 #define PRINTK(x) /**/
90 #endif
91 unsigned int de600_debug = DE600_DEBUG;
92
93 #ifdef MODULE
94 #include <linux/module.h>
95 #include <linux/version.h>
96 #endif
97
98 #include <linux/kernel.h>
99 #include <linux/sched.h>
100 #include <linux/types.h>
101 #include <linux/fcntl.h>
102 #include <linux/string.h>
103 #include <linux/interrupt.h>
104 #include <linux/ioport.h>
105 #include <asm/io.h>
106 #include <linux/in.h>
107 #include <linux/ptrace.h>
108 #include <asm/system.h>
109 #include <linux/errno.h>
110
111 #include <linux/inet.h>
112 #include <linux/netdevice.h>
113 #include <linux/etherdevice.h>
114 #include <linux/skbuff.h>
115
116 #ifdef FAKE_SMALL_MAX
117 static unsigned long de600_rspace(struct sock *sk);
118 #include <net/sock.h>
119 #endif
120
121 #define netstats enet_statistics
122 typedef unsigned char byte;
123
124 /**************************************************
125 * *
126 * Definition of D-Link Ethernet Pocket adapter *
127 * *
128 **************************************************/
129 /*
130 * D-Link Ethernet pocket adapter ports
131 */
132 /*
133 * OK, so I'm cheating, but there are an awful lot of
134 * reads and writes in order to get anything in and out
135 * of the DE-600 with 4 bits at a time in the parallel port,
136 * so every saved instruction really helps :-)
137 *
138 * That is, I don't care what the device struct says
139 * but hope that Space.c will keep the rest of the drivers happy.
140 */
141 #ifndef DE600_IO
142 #define DE600_IO 0x378
143 #endif
144
145 #define DATA_PORT (DE600_IO)
146 #define STATUS_PORT (DE600_IO + 1)
147 #define COMMAND_PORT (DE600_IO + 2)
148
149 #ifndef DE600_IRQ
150 #define DE600_IRQ 7
151 #endif
152 /*
153 * It really should look like this, and autoprobing as well...
154 *
155 #define DATA_PORT (dev->base_addr + 0)
156 #define STATUS_PORT (dev->base_addr + 1)
157 #define COMMAND_PORT (dev->base_addr + 2)
158 #define DE600_IRQ dev->irq
159 */
160
161 /*
162 * D-Link COMMAND_PORT commands
163 */
164 #define SELECT_NIC 0x04 /* select Network Interface Card */
165 #define SELECT_PRN 0x1c /* select Printer */
166 #define NML_PRN 0xec /* normal Printer situation */
167 #define IRQEN 0x10 /* enable IRQ line */
168
169 /*
170 * D-Link STATUS_PORT
171 */
172 #define RX_BUSY 0x80
173 #define RX_GOOD 0x40
174 #define TX_FAILED16 0x10
175 #define TX_BUSY 0x08
176
177 /*
178 * D-Link DATA_PORT commands
179 * command in low 4 bits
180 * data in high 4 bits
181 * select current data nibble with HI_NIBBLE bit
182 */
183 #define WRITE_DATA 0x00 /* write memory */
184 #define READ_DATA 0x01 /* read memory */
185 #define STATUS 0x02 /* read status register */
186 #define COMMAND 0x03 /* write command register (see COMMAND below) */
187 #define NULL_COMMAND 0x04 /* null command */
188 #define RX_LEN 0x05 /* read received packet length */
189 #define TX_ADDR 0x06 /* set adapter transmit memory address */
190 #define RW_ADDR 0x07 /* set adapter read/write memory address */
191 #define HI_NIBBLE 0x08 /* read/write the high nibble of data,
192 or-ed with rest of command */
193
194 /*
195 * command register, accessed through DATA_PORT with low bits = COMMAND
196 */
197 #define RX_ALL 0x01 /* PROMISCUOUS */
198 #define RX_BP 0x02 /* default: BROADCAST & PHYSICAL ADDRESS */
199 #define RX_MBP 0x03 /* MULTICAST, BROADCAST & PHYSICAL ADDRESS */
200
201 #define TX_ENABLE 0x04 /* bit 2 */
202 #define RX_ENABLE 0x08 /* bit 3 */
203
204 #define RESET 0x80 /* set bit 7 high */
205 #define STOP_RESET 0x00 /* set bit 7 low */
206
207 /*
208 * data to command register
209 * (high 4 bits in write to DATA_PORT)
210 */
211 #define RX_PAGE2_SELECT 0x10 /* bit 4, only 2 pages to select */
212 #define RX_BASE_PAGE 0x20 /* bit 5, always set when specifying RX_ADDR */
213 #define FLIP_IRQ 0x40 /* bit 6 */
214
215 /*
216 * D-Link adapter internal memory:
217 *
218 * 0-2K 1:st transmit page (send from pointer up to 2K)
219 * 2-4K 2:nd transmit page (send from pointer up to 4K)
220 *
221 * 4-6K 1:st receive page (data from 4K upwards)
222 * 6-8K 2:nd receive page (data from 6K upwards)
223 *
224 * 8K+ Adapter ROM (contains magic code and last 3 bytes of Ethernet address)
225 */
226 #define MEM_2K 0x0800 /* 2048 */
227 #define MEM_4K 0x1000 /* 4096 */
228 #define MEM_6K 0x1800 /* 6144 */
229 #define NODE_ADDRESS 0x2000 /* 8192 */
230
231 #define RUNT 60 /* Too small Ethernet packet */
232
233 /**************************************************
234 * *
235 * End of definition *
236 * *
237 **************************************************/
238
239 /*
240 * Index to functions, as function prototypes.
241 */
242 /* Routines used internally. (See "convenience macros") */
243 static byte de600_read_status(struct device *dev);
244 static byte de600_read_byte(unsigned char type, struct device *dev);
245
246 /* Put in the device structure. */
247 static int de600_open(struct device *dev);
248 static int de600_close(struct device *dev);
249 static struct netstats *get_stats(struct device *dev);
250 static int de600_start_xmit(struct sk_buff *skb, struct device *dev);
251
252 /* Dispatch from interrupts. */
253 static void de600_interrupt(int irq, struct pt_regs *regs);
254 static int de600_tx_intr(struct device *dev, int irq_status);
255 static void de600_rx_intr(struct device *dev);
256
257 /* Initialization */
258 static void trigger_interrupt(struct device *dev);
259 int de600_probe(struct device *dev);
260 static int adapter_init(struct device *dev);
261
262 /*
263 * D-Link driver variables:
264 */
265 static volatile int rx_page = 0;
266
267 #define TX_PAGES 2
268 static volatile int tx_fifo[TX_PAGES];
269 static volatile int tx_fifo_in = 0;
270 static volatile int tx_fifo_out = 0;
271 static volatile int free_tx_pages = TX_PAGES;
272 static int was_down = 0;
273
274 /*
275 * Convenience macros/functions for D-Link adapter
276 */
277
278 #define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN
279 #define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN
280
281 /* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */
282 #define de600_put_byte(data) ( \
283 outb_p(((data) << 4) | WRITE_DATA , DATA_PORT), \
284 outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))
285
286 /*
287 * The first two outb_p()'s below could perhaps be deleted if there
288 * would be more delay in the last two. Not certain about it yet...
289 */
290 #define de600_put_command(cmd) ( \
291 outb_p(( rx_page << 4) | COMMAND , DATA_PORT), \
292 outb_p(( rx_page & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \
293 outb_p(((rx_page | cmd) << 4) | COMMAND , DATA_PORT), \
294 outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))
295
296 #define de600_setup_address(addr,type) ( \
297 outb_p((((addr) << 4) & 0xf0) | type , DATA_PORT), \
298 outb_p(( (addr) & 0xf0) | type | HI_NIBBLE, DATA_PORT), \
299 outb_p((((addr) >> 4) & 0xf0) | type , DATA_PORT), \
300 outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))
301
302 #define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))
303
304 /* Flip bit, only 2 pages */
305 #define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)
306
307 #define tx_page_adr(a) (((a) + 1) * MEM_2K)
308
309 static inline byte
310 de600_read_status(struct device *dev)
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*/
311 {
312 byte status;
313
314 outb_p(STATUS, DATA_PORT);
315 status = inb(STATUS_PORT);
316 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
317
318 return status;
319 }
320
321 static inline byte
322 de600_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */
/* ![[previous]](../icons/left.png)
*/
323 byte lo;
324
325 (void)outb_p((type), DATA_PORT);
326 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
327 (void)outb_p((type) | HI_NIBBLE, DATA_PORT);
328 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
329 }
330
331 /*
332 * Open/initialize the board. This is called (in the current kernel)
333 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
334 *
335 * This routine should set everything up anew at each open, even
336 * registers that "should" only need to be set once at boot, so that
337 * there is a non-reboot way to recover if something goes wrong.
338 */
339 static int
340 de600_open(struct device *dev)
/* */
341 {
342 if (request_irq(DE600_IRQ, de600_interrupt, 0, "de600")) {
343 printk ("%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
344 return 1;
345 }
346 irq2dev_map[DE600_IRQ] = dev;
347
348 #ifdef MODULE
349 MOD_INC_USE_COUNT;
350 #endif
351 dev->start = 1;
352 if (adapter_init(dev)) {
353 return 1;
354 }
355
356 return 0;
357 }
358
359 /*
360 * The inverse routine to de600_open().
361 */
362 static int
363 de600_close(struct device *dev)
/* */
364 {
365 select_nic();
366 rx_page = 0;
367 de600_put_command(RESET);
368 de600_put_command(STOP_RESET);
369 de600_put_command(0);
370 select_prn();
371
372 if (dev->start) {
373 free_irq(DE600_IRQ);
374 irq2dev_map[DE600_IRQ] = NULL;
375 dev->start = 0;
376 #ifdef MODULE
377 MOD_DEC_USE_COUNT;
378 #endif
379 }
380 return 0;
381 }
382
383 static struct netstats *
384 get_stats(struct device *dev)
/* */
385 {
386 return (struct netstats *)(dev->priv);
387 }
388
389 static inline void
390 trigger_interrupt(struct device *dev)
/* */
391 {
392 de600_put_command(FLIP_IRQ);
393 select_prn();
394 DE600_SLOW_DOWN;
395 select_nic();
396 de600_put_command(0);
397 }
398
399 /*
400 * Copy a buffer to the adapter transmit page memory.
401 * Start sending.
402 */
403 static int
404 de600_start_xmit(struct sk_buff *skb, struct device *dev)
/* */
405 {
406 int transmit_from;
407 int len;
408 int tickssofar;
409 byte *buffer = skb->data;
410
411 /*
412 * If some higher layer thinks we've missed a
413 * tx-done interrupt we are passed NULL.
414 * Caution: dev_tint() handles the cli()/sti() itself.
415 */
416
417 if (skb == NULL) {
418 dev_tint(dev);
419 return 0;
420 }
421
422 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
423 tickssofar = jiffies - dev->trans_start;
424
425 if (tickssofar < 5)
426 return 1;
427
428 /* else */
429 printk("%s: transmit timed out (%d), %s?\n",
430 dev->name,
431 tickssofar,
432 "network cable problem"
433 );
434 /* Restart the adapter. */
435 if (adapter_init(dev)) {
436 return 1;
437 }
438 }
439
440 /* Start real output */
441 PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
442
443 if ((len = skb->len) < RUNT)
444 len = RUNT;
445
446 cli();
447 select_nic();
448 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
449 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
450
451 #ifdef CHECK_LOST_DE600
452 /* This costs about 40 instructions per packet... */
453 de600_setup_address(NODE_ADDRESS, RW_ADDR);
454 de600_read_byte(READ_DATA, dev);
455 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
456 if (adapter_init(dev)) {
457 sti();
458 return 1;
459 }
460 }
461 #endif
462
463 de600_setup_address(transmit_from, RW_ADDR);
464 for ( ; len > 0; --len, ++buffer)
465 de600_put_byte(*buffer);
466
467 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
468 dev->trans_start = jiffies;
469 dev->tbusy = 0; /* allow more packets into adapter */
470 /* Send page and generate a faked interrupt */
471 de600_setup_address(transmit_from, TX_ADDR);
472 de600_put_command(TX_ENABLE);
473 }
474 else {
475 dev->tbusy = !free_tx_pages;
476 select_prn();
477 }
478
479 sti(); /* interrupts back on */
480
481 #ifdef FAKE_SMALL_MAX
482 /* This will "patch" the socket TCP proto at an early moment */
483 if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) &&
484 (skb->sk->prot->rspace != &de600_rspace))
485 skb->sk->prot->rspace = de600_rspace; /* Ugh! */
486 #endif
487
488 dev_kfree_skb (skb, FREE_WRITE);
489
490 return 0;
491 }
492
493 /*
494 * The typical workload of the driver:
495 * Handle the network interface interrupts.
496 */
497 static void
498 de600_interrupt(int irq, struct pt_regs * regs)
/* */
499 {
500 struct device *dev = irq2dev_map[irq];
501 byte irq_status;
502 int retrig = 0;
503 int boguscount = 0;
504
505 /* This might just as well be deleted now, no crummy drivers present :-) */
506 if ((dev == NULL) || (dev->start == 0) || (DE600_IRQ != irq)) {
507 printk("%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
508 return;
509 }
510
511 dev->interrupt = 1;
512 select_nic();
513 irq_status = de600_read_status(dev);
514
515 do {
516 PRINTK(("de600_interrupt (%02X)\n", irq_status));
517
518 if (irq_status & RX_GOOD)
519 de600_rx_intr(dev);
520 else if (!(irq_status & RX_BUSY))
521 de600_put_command(RX_ENABLE);
522
523 /* Any transmission in progress? */
524 if (free_tx_pages < TX_PAGES)
525 retrig = de600_tx_intr(dev, irq_status);
526 else
527 retrig = 0;
528
529 irq_status = de600_read_status(dev);
530 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
531 /*
532 * Yeah, it _looks_ like busy waiting, smells like busy waiting
533 * and I know it's not PC, but please, it will only occur once
534 * in a while and then only for a loop or so (< 1ms for sure!)
535 */
536
537 /* Enable adapter interrupts */
538 dev->interrupt = 0;
539 select_prn();
540
541 if (retrig)
542 trigger_interrupt(dev);
543
544 sti();
545 return;
546 }
547
548 static int
549 de600_tx_intr(struct device *dev, int irq_status)
/* */
550 {
551 /*
552 * Returns 1 if tx still not done
553 */
554
555 mark_bh(NET_BH);
556 /* Check if current transmission is done yet */
557 if (irq_status & TX_BUSY)
558 return 1; /* tx not done, try again */
559
560 /* else */
561 /* If last transmission OK then bump fifo index */
562 if (!(irq_status & TX_FAILED16)) {
563 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
564 ++free_tx_pages;
565 ((struct netstats *)(dev->priv))->tx_packets++;
566 dev->tbusy = 0;
567 }
568
569 /* More to send, or resend last packet? */
570 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
571 dev->trans_start = jiffies;
572 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
573 de600_put_command(TX_ENABLE);
574 return 1;
575 }
576 /* else */
577
578 return 0;
579 }
580
581 /*
582 * We have a good packet, get it out of the adapter.
583 */
584 static void
585 de600_rx_intr(struct device *dev)
/* */
586 {
587 struct sk_buff *skb;
588 int i;
589 int read_from;
590 int size;
591 register unsigned char *buffer;
592
593 cli();
594 /* Get size of received packet */
595 size = de600_read_byte(RX_LEN, dev); /* low byte */
596 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
597 size -= 4; /* Ignore trailing 4 CRC-bytes */
598
599 /* Tell adapter where to store next incoming packet, enable receiver */
600 read_from = rx_page_adr();
601 next_rx_page();
602 de600_put_command(RX_ENABLE);
603 sti();
604
605 if ((size < 32) || (size > 1535)) {
606 printk("%s: Bogus packet size %d.\n", dev->name, size);
607 if (size > 10000)
608 adapter_init(dev);
609 return;
610 }
611
612 skb = dev_alloc_skb(size+2);
613 sti();
614 if (skb == NULL) {
615 printk("%s: Couldn't allocate a sk_buff of size %d.\n",
616 dev->name, size);
617 return;
618 }
619 /* else */
620
621 skb->dev = dev;
622 skb_reserve(skb,2); /* Align */
623
624 /* 'skb->data' points to the start of sk_buff data area. */
625 buffer = skb_put(skb,size);
626
627 /* copy the packet into the buffer */
628 de600_setup_address(read_from, RW_ADDR);
629 for (i = size; i > 0; --i, ++buffer)
630 *buffer = de600_read_byte(READ_DATA, dev);
631
632 ((struct netstats *)(dev->priv))->rx_packets++; /* count all receives */
633
634 skb->protocol=eth_type_trans(skb,dev);
635
636 netif_rx(skb);
637 /*
638 * If any worth-while packets have been received, netif_rx()
639 * has done a mark_bh(INET_BH) for us and will work on them
640 * when we get to the bottom-half routine.
641 */
642 }
643
644 int
645 de600_probe(struct device *dev)
/* */
646 {
647 int i;
648 static struct netstats de600_netstats;
649 /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
650
651 printk("%s: D-Link DE-600 pocket adapter", dev->name);
652 /* Alpha testers must have the version number to report bugs. */
653 if (de600_debug > 1)
654 printk(version);
655
656 /* probe for adapter */
657 rx_page = 0;
658 select_nic();
659 (void)de600_read_status(dev);
660 de600_put_command(RESET);
661 de600_put_command(STOP_RESET);
662 if (de600_read_status(dev) & 0xf0) {
663 printk(": not at I/O %#3x.\n", DATA_PORT);
664 return ENODEV;
665 }
666
667 /*
668 * Maybe we found one,
669 * have to check if it is a D-Link DE-600 adapter...
670 */
671
672 /* Get the adapter ethernet address from the ROM */
673 de600_setup_address(NODE_ADDRESS, RW_ADDR);
674 for (i = 0; i < ETH_ALEN; i++) {
675 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
676 dev->broadcast[i] = 0xff;
677 }
678
679 /* Check magic code */
680 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
681 /* OK, install real address */
682 dev->dev_addr[0] = 0x00;
683 dev->dev_addr[1] = 0x80;
684 dev->dev_addr[2] = 0xc8;
685 dev->dev_addr[3] &= 0x0f;
686 dev->dev_addr[3] |= 0x70;
687 } else {
688 printk(" not identified in the printer port\n");
689 return ENODEV;
690 }
691
692 #if 0 /* Not yet */
693 if (check_region(DE600_IO, 3)) {
694 printk(", port 0x%x busy\n", DE600_IO);
695 return EBUSY;
696 }
697 #endif
698 request_region(DE600_IO, 3, "de600");
699
700 printk(", Ethernet Address: %02X", dev->dev_addr[0]);
701 for (i = 1; i < ETH_ALEN; i++)
702 printk(":%02X",dev->dev_addr[i]);
703 printk("\n");
704
705 /* Initialize the device structure. */
706 /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
707 dev->priv = &de600_netstats;
708
709 memset(dev->priv, 0, sizeof(struct netstats));
710 dev->get_stats = get_stats;
711
712 dev->open = de600_open;
713 dev->stop = de600_close;
714 dev->hard_start_xmit = &de600_start_xmit;
715
716 ether_setup(dev);
717
718 select_prn();
719 return 0;
720 }
721
722 static int
723 adapter_init(struct device *dev)
/* */
724 {
725 int i;
726 long flags;
727
728 save_flags(flags);
729 cli();
730
731 select_nic();
732 rx_page = 0; /* used by RESET */
733 de600_put_command(RESET);
734 de600_put_command(STOP_RESET);
735 #ifdef CHECK_LOST_DE600
736 /* Check if it is still there... */
737 /* Get the some bytes of the adapter ethernet address from the ROM */
738 de600_setup_address(NODE_ADDRESS, RW_ADDR);
739 de600_read_byte(READ_DATA, dev);
740 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
741 (de600_read_byte(READ_DATA, dev) != 0x15)) {
742 /* was: if (de600_read_status(dev) & 0xf0) { */
743 printk("Something has happened to the DE-600! Please check it"
744 #ifdef SHUTDOWN_WHEN_LOST
745 " and do a new ifconfig"
746 #endif /* SHUTDOWN_WHEN_LOST */
747 "!\n");
748 #ifdef SHUTDOWN_WHEN_LOST
749 /* Goodbye, cruel world... */
750 dev->flags &= ~IFF_UP;
751 de600_close(dev);
752 #endif /* SHUTDOWN_WHEN_LOST */
753 was_down = 1;
754 dev->tbusy = 1; /* Transmit busy... */
755 restore_flags(flags);
756 return 1; /* failed */
757 }
758 #endif /* CHECK_LOST_DE600 */
759 if (was_down) {
760 printk("Thanks, I feel much better now!\n");
761 was_down = 0;
762 }
763
764 dev->tbusy = 0; /* Transmit busy... */
765 dev->interrupt = 0;
766 tx_fifo_in = 0;
767 tx_fifo_out = 0;
768 free_tx_pages = TX_PAGES;
769
770 /* set the ether address. */
771 de600_setup_address(NODE_ADDRESS, RW_ADDR);
772 for (i = 0; i < ETH_ALEN; i++)
773 de600_put_byte(dev->dev_addr[i]);
774
775 /* where to start saving incoming packets */
776 rx_page = RX_BP | RX_BASE_PAGE;
777 de600_setup_address(MEM_4K, RW_ADDR);
778 /* Enable receiver */
779 de600_put_command(RX_ENABLE);
780 select_prn();
781 restore_flags(flags);
782
783 return 0; /* OK */
784 }
785
786 #ifdef FAKE_SMALL_MAX
787 /*
788 * The new router code (coming soon 8-) ) will fix this properly.
789 */
790 #define DE600_MIN_WINDOW 1024
791 #define DE600_MAX_WINDOW 2048
792 #define DE600_TCP_WINDOW_DIFF 1024
793 /*
794 * Copied from "net/inet/sock.c"
795 *
796 * Sets a lower max receive window in order to achieve <= 2
797 * packets arriving at the adapter in fast succession.
798 * (No way that a DE-600 can keep up with a net saturated
799 * with packets homing in on it :-( )
800 *
801 * Since there are only 2 receive buffers in the DE-600
802 * and it takes some time to copy from the adapter,
803 * this is absolutely necessary for any TCP performance whatsoever!
804 *
805 * Note that the returned window info will never be smaller than
806 * DE600_MIN_WINDOW, i.e. 1024
807 * This differs from the standard function, that can return an
808 * arbitrarily small window!
809 */
810 #define min(a,b) ((a)<(b)?(a):(b))
811 static unsigned long
812 de600_rspace(struct sock *sk)
/* */
813 {
814 int amt;
815
816 if (sk != NULL) {
817 /*
818 * Hack! You might want to play with commenting away the following line,
819 * if you know what you do!
820 sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF;
821 */
822
823 if (sk->rmem_alloc >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0);
824 amt = min((sk->rcvbuf-sk->rmem_alloc)/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW);
825 if (amt < 0) return(0);
826 return(amt);
827 }
828 return(0);
829 }
830 #endif
831
832 #ifdef MODULE
833 char kernel_version[] = UTS_RELEASE;
834 static char nullname[8];
835 static struct device de600_dev = {
836 nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de600_probe };
837
838 int
839 init_module(void)
/* */
840 {
841 if (register_netdev(&de600_dev) != 0)
842 return -EIO;
843 return 0;
844 }
845
846 void
847 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
848 {
849 unregister_netdev(&de600_dev);
850 release_region(DE600_IO, 3);
851 }
852 #endif /* MODULE */
853 /*
854 * Local variables:
855 * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
856 * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
857 * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
858 * End:
859 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/