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*/
1 static 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 #include <linux/config.h>
94 #include <linux/kernel.h>
95 #include <linux/sched.h>
96 #include <linux/types.h>
97 #include <linux/fcntl.h>
98 #include <linux/string.h>
99 #include <linux/interrupt.h>
100 #include <asm/io.h>
101 #include <netinet/in.h>
102 #include <linux/ptrace.h>
103 #include <asm/system.h>
104 #include <errno.h>
105
106 #include <linux/inet.h>
107 #include <linux/netdevice.h>
108 #include <linux/etherdevice.h>
109 #include <linux/skbuff.h>
110
111 #ifdef MODULE
112 #include <linux/module.h>
113 #include "../../tools/version.h"
114 #endif
115
116 #ifdef FAKE_SMALL_MAX
117 static unsigned long de600_rspace(struct sock *sk);
118 #include "../../net/inet/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 reg_ptr);
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 extern struct device *irq2dev_map[16];
266 static volatile int rx_page = 0;
267
268 #define TX_PAGES 2
269 static volatile int tx_fifo[TX_PAGES];
270 static volatile int tx_fifo_in = 0;
271 static volatile int tx_fifo_out = 0;
272 static volatile int free_tx_pages = TX_PAGES;
273 static int was_down = 0;
274
275 /*
276 * Convenience macros/functions for D-Link adapter
277 */
278
279 #define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN
280 #define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN
281
282 /* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */
283 #define de600_put_byte(data) ( \
284 outb_p(((data) << 4) | WRITE_DATA , DATA_PORT), \
285 outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))
286
287 /*
288 * The first two outb_p()'s below could perhaps be deleted if there
289 * would be more delay in the last two. Not certain about it yet...
290 */
291 #define de600_put_command(cmd) ( \
292 outb_p(( rx_page << 4) | COMMAND , DATA_PORT), \
293 outb_p(( rx_page & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \
294 outb_p(((rx_page | cmd) << 4) | COMMAND , DATA_PORT), \
295 outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))
296
297 #define de600_setup_address(addr,type) ( \
298 outb_p((((addr) << 4) & 0xf0) | type , DATA_PORT), \
299 outb_p(( (addr) & 0xf0) | type | HI_NIBBLE, DATA_PORT), \
300 outb_p((((addr) >> 4) & 0xf0) | type , DATA_PORT), \
301 outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))
302
303 #define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))
304
305 /* Flip bit, only 2 pages */
306 #define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)
307
308 #define tx_page_adr(a) (((a) + 1) * MEM_2K)
309
310 static inline byte
311 de600_read_status(struct device *dev)
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*/
312 {
313 byte status;
314
315 outb_p(STATUS, DATA_PORT);
316 status = inb(STATUS_PORT);
317 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
318
319 return status;
320 }
321
322 static inline byte
323 de600_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */
/* ![[previous]](../icons/left.png)
*/
324 byte lo;
325
326 (void)outb_p((type), DATA_PORT);
327 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
328 (void)outb_p((type) | HI_NIBBLE, DATA_PORT);
329 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
330 }
331
332 /*
333 * Open/initialize the board. This is called (in the current kernel)
334 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
335 *
336 * This routine should set everything up anew at each open, even
337 * registers that "should" only need to be set once at boot, so that
338 * there is a non-reboot way to recover if something goes wrong.
339 */
340 static int
341 de600_open(struct device *dev)
/* */
342 {
343 if (request_irq(DE600_IRQ, de600_interrupt, 0, "de600")) {
344 printk ("%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
345 return 1;
346 }
347 irq2dev_map[DE600_IRQ] = dev;
348
349 #ifdef MODULE
350 MOD_INC_USE_COUNT;
351 #endif
352 dev->start = 1;
353 if (adapter_init(dev)) {
354 return 1;
355 }
356
357 return 0;
358 }
359
360 /*
361 * The inverse routine to de600_open().
362 */
363 static int
364 de600_close(struct device *dev)
/* */
365 {
366 select_nic();
367 rx_page = 0;
368 de600_put_command(RESET);
369 de600_put_command(STOP_RESET);
370 de600_put_command(0);
371 select_prn();
372
373 if (dev->start) {
374 free_irq(DE600_IRQ);
375 irq2dev_map[DE600_IRQ] = NULL;
376 dev->start = 0;
377 #ifdef MODULE
378 MOD_DEC_USE_COUNT;
379 #endif
380 }
381 return 0;
382 }
383
384 static struct netstats *
385 get_stats(struct device *dev)
/* */
386 {
387 return (struct netstats *)(dev->priv);
388 }
389
390 static inline void
391 trigger_interrupt(struct device *dev)
/* */
392 {
393 de600_put_command(FLIP_IRQ);
394 select_prn();
395 DE600_SLOW_DOWN;
396 select_nic();
397 de600_put_command(0);
398 }
399
400 /*
401 * Copy a buffer to the adapter transmit page memory.
402 * Start sending.
403 */
404 static int
405 de600_start_xmit(struct sk_buff *skb, struct device *dev)
/* */
406 {
407 int transmit_from;
408 int len;
409 int tickssofar;
410 byte *buffer = skb->data;
411
412 /*
413 * If some higher layer thinks we've missed a
414 * tx-done interrupt we are passed NULL.
415 * Caution: dev_tint() handles the cli()/sti() itself.
416 */
417
418 if (skb == NULL) {
419 dev_tint(dev);
420 return 0;
421 }
422
423 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
424 tickssofar = jiffies - dev->trans_start;
425
426 if (tickssofar < 5)
427 return 1;
428
429 /* else */
430 printk("%s: transmit timed out (%d), %s?\n",
431 dev->name,
432 tickssofar,
433 "network cable problem"
434 );
435 /* Restart the adapter. */
436 if (adapter_init(dev)) {
437 return 1;
438 }
439 }
440
441 /* Start real output */
442 PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
443
444 if ((len = skb->len) < RUNT)
445 len = RUNT;
446
447 cli();
448 select_nic();
449 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
450 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
451
452 #ifdef CHECK_LOST_DE600
453 /* This costs about 40 instructions per packet... */
454 de600_setup_address(NODE_ADDRESS, RW_ADDR);
455 de600_read_byte(READ_DATA, dev);
456 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
457 if (adapter_init(dev)) {
458 sti();
459 return 1;
460 }
461 }
462 #endif
463
464 de600_setup_address(transmit_from, RW_ADDR);
465 for ( ; len > 0; --len, ++buffer)
466 de600_put_byte(*buffer);
467
468 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
469 dev->trans_start = jiffies;
470 dev->tbusy = 0; /* allow more packets into adapter */
471 /* Send page and generate a faked interrupt */
472 de600_setup_address(transmit_from, TX_ADDR);
473 de600_put_command(TX_ENABLE);
474 }
475 else {
476 dev->tbusy = !free_tx_pages;
477 select_prn();
478 }
479
480 sti(); /* interrupts back on */
481
482 #ifdef FAKE_SMALL_MAX
483 /* This will "patch" the socket TCP proto at an early moment */
484 if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) &&
485 (skb->sk->prot->rspace != &de600_rspace))
486 skb->sk->prot->rspace = de600_rspace; /* Ugh! */
487 #endif
488
489 dev_kfree_skb (skb, FREE_WRITE);
490
491 return 0;
492 }
493
494 /*
495 * The typical workload of the driver:
496 * Handle the network interface interrupts.
497 */
498 static void
499 de600_interrupt(int reg_ptr)
/* */
500 {
501 int irq = -(((struct pt_regs *)reg_ptr)->orig_eax+2);
502 struct device *dev = irq2dev_map[irq];
503 byte irq_status;
504 int retrig = 0;
505 int boguscount = 0;
506
507 /* This might just as well be deleted now, no crummy drivers present :-) */
508 if ((dev == NULL) || (dev->start == 0) || (DE600_IRQ != irq)) {
509 printk("%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
510 return;
511 }
512
513 dev->interrupt = 1;
514 select_nic();
515 irq_status = de600_read_status(dev);
516
517 do {
518 PRINTK(("de600_interrupt (%02X)\n", irq_status));
519
520 if (irq_status & RX_GOOD)
521 de600_rx_intr(dev);
522 else if (!(irq_status & RX_BUSY))
523 de600_put_command(RX_ENABLE);
524
525 /* Any transmission in progress? */
526 if (free_tx_pages < TX_PAGES)
527 retrig = de600_tx_intr(dev, irq_status);
528 else
529 retrig = 0;
530
531 irq_status = de600_read_status(dev);
532 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
533 /*
534 * Yeah, it _looks_ like busy waiting, smells like busy waiting
535 * and I know it's not PC, but please, it will only occur once
536 * in a while and then only for a loop or so (< 1ms for sure!)
537 */
538
539 /* Enable adapter interrupts */
540 dev->interrupt = 0;
541 select_prn();
542
543 if (retrig)
544 trigger_interrupt(dev);
545
546 sti();
547 return;
548 }
549
550 static int
551 de600_tx_intr(struct device *dev, int irq_status)
/* */
552 {
553 /*
554 * Returns 1 if tx still not done
555 */
556
557 mark_bh(NET_BH);
558 /* Check if current transmission is done yet */
559 if (irq_status & TX_BUSY)
560 return 1; /* tx not done, try again */
561
562 /* else */
563 /* If last transmission OK then bump fifo index */
564 if (!(irq_status & TX_FAILED16)) {
565 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
566 ++free_tx_pages;
567 ((struct netstats *)(dev->priv))->tx_packets++;
568 dev->tbusy = 0;
569 }
570
571 /* More to send, or resend last packet? */
572 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
573 dev->trans_start = jiffies;
574 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
575 de600_put_command(TX_ENABLE);
576 return 1;
577 }
578 /* else */
579
580 return 0;
581 }
582
583 /*
584 * We have a good packet, get it out of the adapter.
585 */
586 static void
587 de600_rx_intr(struct device *dev)
/* */
588 {
589 struct sk_buff *skb;
590 int i;
591 int read_from;
592 int size;
593 register unsigned char *buffer;
594
595 cli();
596 /* Get size of received packet */
597 size = de600_read_byte(RX_LEN, dev); /* low byte */
598 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
599 size -= 4; /* Ignore trailing 4 CRC-bytes */
600
601 /* Tell adapter where to store next incoming packet, enable receiver */
602 read_from = rx_page_adr();
603 next_rx_page();
604 de600_put_command(RX_ENABLE);
605 sti();
606
607 if ((size < 32) || (size > 1535)) {
608 printk("%s: Bogus packet size %d.\n", dev->name, size);
609 if (size > 10000)
610 adapter_init(dev);
611 return;
612 }
613
614 skb = alloc_skb(size, GFP_ATOMIC);
615 sti();
616 if (skb == NULL) {
617 printk("%s: Couldn't allocate a sk_buff of size %d.\n",
618 dev->name, size);
619 return;
620 }
621 /* else */
622
623 skb->lock = 0;
624 /* 'skb->data' points to the start of sk_buff data area. */
625 buffer = skb->data;
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 if (dev_rint((unsigned char *)skb, size, IN_SKBUFF, dev))
635 printk("%s: receive buffers full.\n", dev->name);
636 /*
637 * If any worth-while packets have been received, dev_rint()
638 * has done a mark_bh(INET_BH) for us and will work on them
639 * when we get to the bottom-half routine.
640 */
641 }
642
643 int
644 de600_probe(struct device *dev)
/* */
645 {
646 int i;
647 static struct netstats de600_netstats;
648 /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
649
650 printk("%s: D-Link DE-600 pocket adapter", dev->name);
651 /* Alpha testers must have the version number to report bugs. */
652 if (de600_debug > 1)
653 printk(version);
654
655 /* probe for adapter */
656 rx_page = 0;
657 select_nic();
658 (void)de600_read_status(dev);
659 de600_put_command(RESET);
660 de600_put_command(STOP_RESET);
661 if (de600_read_status(dev) & 0xf0) {
662 printk(": not at I/O %#3x.\n", DATA_PORT);
663 return ENODEV;
664 }
665
666 /*
667 * Maybe we found one,
668 * have to check if it is a D-Link DE-600 adapter...
669 */
670
671 /* Get the adapter ethernet address from the ROM */
672 de600_setup_address(NODE_ADDRESS, RW_ADDR);
673 for (i = 0; i < ETH_ALEN; i++) {
674 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
675 dev->broadcast[i] = 0xff;
676 }
677
678 /* Check magic code */
679 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
680 /* OK, install real address */
681 dev->dev_addr[0] = 0x00;
682 dev->dev_addr[1] = 0x80;
683 dev->dev_addr[2] = 0xc8;
684 dev->dev_addr[3] &= 0x0f;
685 dev->dev_addr[3] |= 0x70;
686 } else {
687 printk(" not identified in the printer port\n");
688 return ENODEV;
689 }
690
691 printk(", Ethernet Address: %02X", dev->dev_addr[0]);
692 for (i = 1; i < ETH_ALEN; i++)
693 printk(":%02X",dev->dev_addr[i]);
694 printk("\n");
695
696 /* Initialize the device structure. */
697 /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
698 dev->priv = &de600_netstats;
699
700 memset(dev->priv, 0, sizeof(struct netstats));
701 dev->get_stats = get_stats;
702
703 dev->open = de600_open;
704 dev->stop = de600_close;
705 dev->hard_start_xmit = &de600_start_xmit;
706
707 ether_setup(dev);
708
709 select_prn();
710 return 0;
711 }
712
713 static int
714 adapter_init(struct device *dev)
/* */
715 {
716 int i;
717 long flags;
718
719 save_flags(flags);
720 cli();
721
722 select_nic();
723 rx_page = 0; /* used by RESET */
724 de600_put_command(RESET);
725 de600_put_command(STOP_RESET);
726 #ifdef CHECK_LOST_DE600
727 /* Check if it is still there... */
728 /* Get the some bytes of the adapter ethernet address from the ROM */
729 de600_setup_address(NODE_ADDRESS, RW_ADDR);
730 de600_read_byte(READ_DATA, dev);
731 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
732 (de600_read_byte(READ_DATA, dev) != 0x15)) {
733 /* was: if (de600_read_status(dev) & 0xf0) { */
734 printk("Something has happened to the DE-600! Please check it"
735 #ifdef SHUTDOWN_WHEN_LOST
736 " and do a new ifconfig"
737 #endif /* SHUTDOWN_WHEN_LOST */
738 "!\n");
739 #ifdef SHUTDOWN_WHEN_LOST
740 /* Goodbye, cruel world... */
741 dev->flags &= ~IFF_UP;
742 de600_close(dev);
743 #endif /* SHUTDOWN_WHEN_LOST */
744 was_down = 1;
745 dev->tbusy = 1; /* Transmit busy... */
746 return 1; /* failed */
747 }
748 #endif /* CHECK_LOST_DE600 */
749 if (was_down) {
750 printk("Thanks, I feel much better now!\n");
751 was_down = 0;
752 }
753
754 dev->tbusy = 0; /* Transmit busy... */
755 dev->interrupt = 0;
756 tx_fifo_in = 0;
757 tx_fifo_out = 0;
758 free_tx_pages = TX_PAGES;
759
760 /* set the ether address. */
761 de600_setup_address(NODE_ADDRESS, RW_ADDR);
762 for (i = 0; i < ETH_ALEN; i++)
763 de600_put_byte(dev->dev_addr[i]);
764
765 /* where to start saving incoming packets */
766 rx_page = RX_BP | RX_BASE_PAGE;
767 de600_setup_address(MEM_4K, RW_ADDR);
768 /* Enable receiver */
769 de600_put_command(RX_ENABLE);
770 select_prn();
771 restore_flags(flags);
772
773 return 0; /* OK */
774 }
775
776 #ifdef FAKE_SMALL_MAX
777 /*
778 * The new router code (coming soon 8-) ) will fix this properly.
779 */
780 #define DE600_MIN_WINDOW 1024
781 #define DE600_MAX_WINDOW 2048
782 #define DE600_TCP_WINDOW_DIFF 1024
783 /*
784 * Copied from "net/inet/sock.c"
785 *
786 * Sets a lower max receive window in order to achieve <= 2
787 * packets arriving at the adapter in fast succession.
788 * (No way that a DE-600 can keep up with a net saturated
789 * with packets homing in on it :-( )
790 *
791 * Since there are only 2 receive buffers in the DE-600
792 * and it takes some time to copy from the adapter,
793 * this is absolutely necessary for any TCP performance whatsoever!
794 *
795 * Note that the returned window info will never be smaller than
796 * DE600_MIN_WINDOW, i.e. 1024
797 * This differs from the standard function, that can return an
798 * arbitrarily small window!
799 */
800 #define min(a,b) ((a)<(b)?(a):(b))
801 static unsigned long
802 de600_rspace(struct sock *sk)
/* */
803 {
804 int amt;
805
806 if (sk != NULL) {
807 /*
808 * Hack! You might want to play with commenting away the following line,
809 * if you know what you do!
810 sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF;
811 */
812
813 if (sk->rmem_alloc >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0);
814 amt = min((sk->rcvbuf-sk->rmem_alloc)/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW);
815 if (amt < 0) return(0);
816 return(amt);
817 }
818 return(0);
819 }
820 #endif
821
822 #ifdef MODULE
823 char kernel_version[] = UTS_RELEASE;
824 static char nullname[8];
825 static struct device de600_dev = {
826 nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de600_probe };
827
828 int
829 init_module(void)
/* */
830 {
831 if (register_netdev(&de600_dev) != 0)
832 return -EIO;
833 return 0;
834 }
835
836 void
837 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
838 {
839 if (MOD_IN_USE)
840 printk("de600: device busy, remove delayed\n");
841 else
842 unregister_netdev(&de600_dev);
843 }
844 #endif /* MODULE */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/