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1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | */ | |
6aa20a22 | 170 | |
1da177e4 LT |
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 | ||
7d12e780 | 249 | static irqreturn_t de600_interrupt(int irq, void *dev_id) |
1da177e4 LT |
250 | { |
251 | struct net_device *dev = dev_id; | |
252 | u8 irq_status; | |
253 | int retrig = 0; | |
254 | int boguscount = 0; | |
255 | ||
1da177e4 | 256 | spin_lock(&de600_lock); |
6aa20a22 | 257 | |
1da177e4 LT |
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; | |
09f75cd7 | 306 | dev->stats.tx_packets++; |
1da177e4 LT |
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 | ||
1da177e4 LT |
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; | |
09f75cd7 JG |
373 | dev->stats.rx_packets++; /* count all receives */ |
374 | dev->stats.rx_bytes += size; /* count all received bytes */ | |
1da177e4 LT |
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; | |
0795af57 | 387 | DECLARE_MAC_BUF(mac); |
1da177e4 | 388 | |
09f75cd7 | 389 | dev = alloc_etherdev(0); |
1da177e4 LT |
390 | if (!dev) |
391 | return ERR_PTR(-ENOMEM); | |
392 | ||
1da177e4 LT |
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 | ||
0795af57 | 442 | printk(", Ethernet Address: %s\n", print_mac(mac, dev->dev_addr)); |
1da177e4 | 443 | |
1da177e4 LT |
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"); |