1 static const char version[] = "de600.c: $Revision: 1.41-2.5 $, Bjorn Ekwall (bj0rn@blox.se)\n";
2 /*
3 * de600.c
4 *
5 * Linux driver for the D-Link DE-600 Ethernet pocket adapter.
6 *
7 * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
8 * The Author may be reached as bj0rn@blox.se
9 *
10 * Based on adapter information gathered from DE600.ASM by D-Link Inc.,
11 * as included on disk C in the v.2.11 of PC/TCP from FTP Software.
12 * For DE600.asm:
13 * Portions (C) Copyright 1990 D-Link, Inc.
14 * Copyright, 1988-1992, Russell Nelson, Crynwr Software
15 *
16 * Adapted to the sample network driver core for linux,
17 * written by: Donald Becker <becker@super.org>
18 * (Now at <becker@scyld.com>)
19 *
20 **************************************************************/
21 /*
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2, or (at your option)
25 * any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 *
36 **************************************************************/
37
38 /* Add more time here if your adapter won't work OK: */
39 #define DE600_SLOW_DOWN udelay(delay_time)
40
41 /* use 0 for production, 1 for verification, >2 for debug */
42 #ifdef DE600_DEBUG
43 #define PRINTK(x) if (de600_debug >= 2) printk x
44 #else
45 #define DE600_DEBUG 0
46 #define PRINTK(x) /**/
47 #endif
48
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/fcntl.h>
53 #include <linux/string.h>
54 #include <linux/interrupt.h>
55 #include <linux/ioport.h>
56 #include <linux/in.h>
57 #include <asm/system.h>
58 #include <linux/errno.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65
66 #include <asm/io.h>
67
68 #include "de600.h"
69
70 static unsigned int de600_debug = DE600_DEBUG;
71 module_param(de600_debug, int, 0);
72 MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
73
74 static unsigned int check_lost = 1;
75 module_param(check_lost, bool, 0);
76 MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
77
78 static unsigned int delay_time = 10;
79 module_param(delay_time, int, 0);
80 MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
81
82
83 /*
84 * D-Link driver variables:
85 */
86
87 static volatile int rx_page;
88
89 #define TX_PAGES 2
90 static volatile int tx_fifo[TX_PAGES];
91 static volatile int tx_fifo_in;
92 static volatile int tx_fifo_out;
93 static volatile int free_tx_pages = TX_PAGES;
94 static int was_down;
95 static DEFINE_SPINLOCK(de600_lock);
96
97 static inline u8 de600_read_status(struct net_device *dev)
98 {
99 u8 status;
100
101 outb_p(STATUS, DATA_PORT);
102 status = inb(STATUS_PORT);
103 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
104
105 return status;
106 }
107
108 static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
109 {
110 /* dev used by macros */
111 u8 lo;
112 outb_p((type), DATA_PORT);
113 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
114 outb_p((type) | HI_NIBBLE, DATA_PORT);
115 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
116 }
117
118 /*
119 * Open/initialize the board. This is called (in the current kernel)
120 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
121 *
122 * This routine should set everything up anew at each open, even
123 * registers that "should" only need to be set once at boot, so that
124 * there is a non-reboot way to recover if something goes wrong.
125 */
126
127 static int de600_open(struct net_device *dev)
128 {
129 unsigned long flags;
130 int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
131 if (ret) {
132 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
133 return ret;
134 }
135 spin_lock_irqsave(&de600_lock, flags);
136 ret = adapter_init(dev);
137 spin_unlock_irqrestore(&de600_lock, flags);
138 return ret;
139 }
140
141 /*
142 * The inverse routine to de600_open().
143 */
144
145 static int de600_close(struct net_device *dev)
146 {
147 select_nic();
148 rx_page = 0;
149 de600_put_command(RESET);
150 de600_put_command(STOP_RESET);
151 de600_put_command(0);
152 select_prn();
153 free_irq(DE600_IRQ, dev);
154 return 0;
155 }
156
157 static inline void trigger_interrupt(struct net_device *dev)
158 {
159 de600_put_command(FLIP_IRQ);
160 select_prn();
161 DE600_SLOW_DOWN;
162 select_nic();
163 de600_put_command(0);
164 }
165
166 /*
167 * Copy a buffer to the adapter transmit page memory.
168 * Start sending.
169 */
170
171 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
172 {
173 unsigned long flags;
174 int transmit_from;
175 int len;
176 int tickssofar;
177 u8 *buffer = skb->data;
178 int i;
179
180 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
181 tickssofar = jiffies - dev->trans_start;
182 if (tickssofar < 5)
183 return 1;
184 /* else */
185 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
186 /* Restart the adapter. */
187 spin_lock_irqsave(&de600_lock, flags);
188 if (adapter_init(dev)) {
189 spin_unlock_irqrestore(&de600_lock, flags);
190 return 1;
191 }
192 spin_unlock_irqrestore(&de600_lock, flags);
193 }
194
195 /* Start real output */
196 PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
197
198 if ((len = skb->len) < RUNT)
199 len = RUNT;
200
201 spin_lock_irqsave(&de600_lock, flags);
202 select_nic();
203 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
204 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
205
206 if(check_lost)
207 {
208 /* This costs about 40 instructions per packet... */
209 de600_setup_address(NODE_ADDRESS, RW_ADDR);
210 de600_read_byte(READ_DATA, dev);
211 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
212 if (adapter_init(dev)) {
213 spin_unlock_irqrestore(&de600_lock, flags);
214 return 1;
215 }
216 }
217 }
218
219 de600_setup_address(transmit_from, RW_ADDR);
220 for (i = 0; i < skb->len ; ++i, ++buffer)
221 de600_put_byte(*buffer);
222 for (; i < len; ++i)
223 de600_put_byte(0);
224
225 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
226 dev->trans_start = jiffies;
227 netif_start_queue(dev); /* allow more packets into adapter */
228 /* Send page and generate a faked interrupt */
229 de600_setup_address(transmit_from, TX_ADDR);
230 de600_put_command(TX_ENABLE);
231 }
232 else {
233 if (free_tx_pages)
234 netif_start_queue(dev);
235 else
236 netif_stop_queue(dev);
237 select_prn();
238 }
239 spin_unlock_irqrestore(&de600_lock, flags);
240 dev_kfree_skb(skb);
241 return 0;
242 }
243
244 /*
245 * The typical workload of the driver:
246 * Handle the network interface interrupts.
247 */
248
249 static irqreturn_t de600_interrupt(int irq, void *dev_id)
250 {
251 struct net_device *dev = dev_id;
252 u8 irq_status;
253 int retrig = 0;
254 int boguscount = 0;
255
256 spin_lock(&de600_lock);
257
258 select_nic();
259 irq_status = de600_read_status(dev);
260
261 do {
262 PRINTK(("de600_interrupt (%02X)\n", irq_status));
263
264 if (irq_status & RX_GOOD)
265 de600_rx_intr(dev);
266 else if (!(irq_status & RX_BUSY))
267 de600_put_command(RX_ENABLE);
268
269 /* Any transmission in progress? */
270 if (free_tx_pages < TX_PAGES)
271 retrig = de600_tx_intr(dev, irq_status);
272 else
273 retrig = 0;
274
275 irq_status = de600_read_status(dev);
276 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
277 /*
278 * Yeah, it _looks_ like busy waiting, smells like busy waiting
279 * and I know it's not PC, but please, it will only occur once
280 * in a while and then only for a loop or so (< 1ms for sure!)
281 */
282
283 /* Enable adapter interrupts */
284 select_prn();
285 if (retrig)
286 trigger_interrupt(dev);
287 spin_unlock(&de600_lock);
288 return IRQ_HANDLED;
289 }
290
291 static int de600_tx_intr(struct net_device *dev, int irq_status)
292 {
293 /*
294 * Returns 1 if tx still not done
295 */
296
297 /* Check if current transmission is done yet */
298 if (irq_status & TX_BUSY)
299 return 1; /* tx not done, try again */
300
301 /* else */
302 /* If last transmission OK then bump fifo index */
303 if (!(irq_status & TX_FAILED16)) {
304 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
305 ++free_tx_pages;
306 dev->stats.tx_packets++;
307 netif_wake_queue(dev);
308 }
309
310 /* More to send, or resend last packet? */
311 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
312 dev->trans_start = jiffies;
313 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
314 de600_put_command(TX_ENABLE);
315 return 1;
316 }
317 /* else */
318
319 return 0;
320 }
321
322 /*
323 * We have a good packet, get it out of the adapter.
324 */
325 static void de600_rx_intr(struct net_device *dev)
326 {
327 struct sk_buff *skb;
328 int i;
329 int read_from;
330 int size;
331 unsigned char *buffer;
332
333 /* Get size of received packet */
334 size = de600_read_byte(RX_LEN, dev); /* low byte */
335 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
336 size -= 4; /* Ignore trailing 4 CRC-bytes */
337
338 /* Tell adapter where to store next incoming packet, enable receiver */
339 read_from = rx_page_adr();
340 next_rx_page();
341 de600_put_command(RX_ENABLE);
342
343 if ((size < 32) || (size > 1535)) {
344 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
345 if (size > 10000)
346 adapter_init(dev);
347 return;
348 }
349
350 skb = dev_alloc_skb(size+2);
351 if (skb == NULL) {
352 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
353 return;
354 }
355 /* else */
356
357 skb_reserve(skb,2); /* Align */
358
359 /* 'skb->data' points to the start of sk_buff data area. */
360 buffer = skb_put(skb,size);
361
362 /* copy the packet into the buffer */
363 de600_setup_address(read_from, RW_ADDR);
364 for (i = size; i > 0; --i, ++buffer)
365 *buffer = de600_read_byte(READ_DATA, dev);
366
367 skb->protocol=eth_type_trans(skb,dev);
368
369 netif_rx(skb);
370
371 /* update stats */
372 dev->last_rx = jiffies;
373 dev->stats.rx_packets++; /* count all receives */
374 dev->stats.rx_bytes += size; /* count all received bytes */
375
376 /*
377 * If any worth-while packets have been received, netif_rx()
378 * will work on them when we get to the tasklets.
379 */
380 }
381
382 static struct net_device * __init de600_probe(void)
383 {
384 int i;
385 struct net_device *dev;
386 int err;
387 DECLARE_MAC_BUF(mac);
388
389 dev = alloc_etherdev(0);
390 if (!dev)
391 return ERR_PTR(-ENOMEM);
392
393
394 if (!request_region(DE600_IO, 3, "de600")) {
395 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
396 err = -EBUSY;
397 goto out;
398 }
399
400 printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
401 /* Alpha testers must have the version number to report bugs. */
402 if (de600_debug > 1)
403 printk(version);
404
405 /* probe for adapter */
406 err = -ENODEV;
407 rx_page = 0;
408 select_nic();
409 (void)de600_read_status(dev);
410 de600_put_command(RESET);
411 de600_put_command(STOP_RESET);
412 if (de600_read_status(dev) & 0xf0) {
413 printk(": not at I/O %#3x.\n", DATA_PORT);
414 goto out1;
415 }
416
417 /*
418 * Maybe we found one,
419 * have to check if it is a D-Link DE-600 adapter...
420 */
421
422 /* Get the adapter ethernet address from the ROM */
423 de600_setup_address(NODE_ADDRESS, RW_ADDR);
424 for (i = 0; i < ETH_ALEN; i++) {
425 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
426 dev->broadcast[i] = 0xff;
427 }
428
429 /* Check magic code */
430 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
431 /* OK, install real address */
432 dev->dev_addr[0] = 0x00;
433 dev->dev_addr[1] = 0x80;
434 dev->dev_addr[2] = 0xc8;
435 dev->dev_addr[3] &= 0x0f;
436 dev->dev_addr[3] |= 0x70;
437 } else {
438 printk(" not identified in the printer port\n");
439 goto out1;
440 }
441
442 printk(", Ethernet Address: %s\n", print_mac(mac, dev->dev_addr));
443
444 dev->open = de600_open;
445 dev->stop = de600_close;
446 dev->hard_start_xmit = &de600_start_xmit;
447
448 dev->flags&=~IFF_MULTICAST;
449
450 select_prn();
451
452 err = register_netdev(dev);
453 if (err)
454 goto out1;
455
456 return dev;
457
458 out1:
459 release_region(DE600_IO, 3);
460 out:
461 free_netdev(dev);
462 return ERR_PTR(err);
463 }
464
465 static int adapter_init(struct net_device *dev)
466 {
467 int i;
468
469 select_nic();
470 rx_page = 0; /* used by RESET */
471 de600_put_command(RESET);
472 de600_put_command(STOP_RESET);
473
474 /* Check if it is still there... */
475 /* Get the some bytes of the adapter ethernet address from the ROM */
476 de600_setup_address(NODE_ADDRESS, RW_ADDR);
477 de600_read_byte(READ_DATA, dev);
478 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
479 (de600_read_byte(READ_DATA, dev) != 0x15)) {
480 /* was: if (de600_read_status(dev) & 0xf0) { */
481 printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
482 /* Goodbye, cruel world... */
483 dev->flags &= ~IFF_UP;
484 de600_close(dev);
485 was_down = 1;
486 netif_stop_queue(dev); /* Transmit busy... */
487 return 1; /* failed */
488 }
489
490 if (was_down) {
491 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
492 was_down = 0;
493 }
494
495 tx_fifo_in = 0;
496 tx_fifo_out = 0;
497 free_tx_pages = TX_PAGES;
498
499
500 /* set the ether address. */
501 de600_setup_address(NODE_ADDRESS, RW_ADDR);
502 for (i = 0; i < ETH_ALEN; i++)
503 de600_put_byte(dev->dev_addr[i]);
504
505 /* where to start saving incoming packets */
506 rx_page = RX_BP | RX_BASE_PAGE;
507 de600_setup_address(MEM_4K, RW_ADDR);
508 /* Enable receiver */
509 de600_put_command(RX_ENABLE);
510 select_prn();
511
512 netif_start_queue(dev);
513
514 return 0; /* OK */
515 }
516
517 static struct net_device *de600_dev;
518
519 static int __init de600_init(void)
520 {
521 de600_dev = de600_probe();
522 if (IS_ERR(de600_dev))
523 return PTR_ERR(de600_dev);
524 return 0;
525 }
526
527 static void __exit de600_exit(void)
528 {
529 unregister_netdev(de600_dev);
530 release_region(DE600_IO, 3);
531 free_netdev(de600_dev);
532 }
533
534 module_init(de600_init);
535 module_exit(de600_exit);
536
537 MODULE_LICENSE("GPL");
538
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