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Linus Torvalds1da177e2005-04-16 15:20:36 -07001static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/module.h>
42#include <linux/kernel.h>
43#include <linux/types.h>
44#include <linux/fcntl.h>
45#include <linux/string.h>
46#include <linux/interrupt.h>
47#include <linux/ioport.h>
48#include <linux/in.h>
49#include <asm/system.h>
50#include <linux/errno.h>
51#include <linux/init.h>
52#include <linux/delay.h>
53#include <linux/inet.h>
54#include <linux/netdevice.h>
55#include <linux/etherdevice.h>
56#include <linux/skbuff.h>
57
58#include <asm/io.h>
59
60#include "de600.h"
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static unsigned int check_lost = 1;
63module_param(check_lost, bool, 0);
64MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
65
66static unsigned int delay_time = 10;
67module_param(delay_time, int, 0);
68MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
69
70
71/*
72 * D-Link driver variables:
73 */
74
75static volatile int rx_page;
76
77#define TX_PAGES 2
78static volatile int tx_fifo[TX_PAGES];
79static volatile int tx_fifo_in;
80static volatile int tx_fifo_out;
81static volatile int free_tx_pages = TX_PAGES;
82static int was_down;
83static DEFINE_SPINLOCK(de600_lock);
84
85static inline u8 de600_read_status(struct net_device *dev)
86{
87 u8 status;
88
89 outb_p(STATUS, DATA_PORT);
90 status = inb(STATUS_PORT);
91 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
92
93 return status;
94}
95
96static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
97{
98 /* dev used by macros */
99 u8 lo;
100 outb_p((type), DATA_PORT);
101 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
102 outb_p((type) | HI_NIBBLE, DATA_PORT);
103 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
104}
105
106/*
107 * Open/initialize the board. This is called (in the current kernel)
108 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
109 *
110 * This routine should set everything up anew at each open, even
111 * registers that "should" only need to be set once at boot, so that
112 * there is a non-reboot way to recover if something goes wrong.
113 */
114
115static int de600_open(struct net_device *dev)
116{
117 unsigned long flags;
118 int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
119 if (ret) {
120 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
121 return ret;
122 }
123 spin_lock_irqsave(&de600_lock, flags);
124 ret = adapter_init(dev);
125 spin_unlock_irqrestore(&de600_lock, flags);
126 return ret;
127}
128
129/*
130 * The inverse routine to de600_open().
131 */
132
133static int de600_close(struct net_device *dev)
134{
135 select_nic();
136 rx_page = 0;
137 de600_put_command(RESET);
138 de600_put_command(STOP_RESET);
139 de600_put_command(0);
140 select_prn();
141 free_irq(DE600_IRQ, dev);
142 return 0;
143}
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145static inline void trigger_interrupt(struct net_device *dev)
146{
147 de600_put_command(FLIP_IRQ);
148 select_prn();
149 DE600_SLOW_DOWN;
150 select_nic();
151 de600_put_command(0);
152}
153
154/*
155 * Copy a buffer to the adapter transmit page memory.
156 * Start sending.
157 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
160{
161 unsigned long flags;
162 int transmit_from;
163 int len;
164 int tickssofar;
165 u8 *buffer = skb->data;
166 int i;
167
168 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
Eric Dumazet1ae5dc32010-05-10 05:01:31 -0700169 tickssofar = jiffies - dev_trans_start(dev);
170 if (tickssofar < HZ/20)
Patrick McHardy5b548142009-06-12 06:22:29 +0000171 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 /* else */
173 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
174 /* Restart the adapter. */
175 spin_lock_irqsave(&de600_lock, flags);
176 if (adapter_init(dev)) {
177 spin_unlock_irqrestore(&de600_lock, flags);
Patrick McHardy5b548142009-06-12 06:22:29 +0000178 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 spin_unlock_irqrestore(&de600_lock, flags);
181 }
182
183 /* Start real output */
Alexander Beregalov64303252009-05-15 10:22:39 +0000184 pr_debug("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 if ((len = skb->len) < RUNT)
187 len = RUNT;
188
189 spin_lock_irqsave(&de600_lock, flags);
190 select_nic();
191 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
192 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
193
194 if(check_lost)
195 {
196 /* This costs about 40 instructions per packet... */
197 de600_setup_address(NODE_ADDRESS, RW_ADDR);
198 de600_read_byte(READ_DATA, dev);
199 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
200 if (adapter_init(dev)) {
201 spin_unlock_irqrestore(&de600_lock, flags);
Patrick McHardy5b548142009-06-12 06:22:29 +0000202 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
204 }
205 }
206
207 de600_setup_address(transmit_from, RW_ADDR);
208 for (i = 0; i < skb->len ; ++i, ++buffer)
209 de600_put_byte(*buffer);
210 for (; i < len; ++i)
211 de600_put_byte(0);
212
213 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
214 dev->trans_start = jiffies;
215 netif_start_queue(dev); /* allow more packets into adapter */
216 /* Send page and generate a faked interrupt */
217 de600_setup_address(transmit_from, TX_ADDR);
218 de600_put_command(TX_ENABLE);
219 }
220 else {
221 if (free_tx_pages)
222 netif_start_queue(dev);
223 else
224 netif_stop_queue(dev);
225 select_prn();
226 }
227 spin_unlock_irqrestore(&de600_lock, flags);
228 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000229 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/*
233 * The typical workload of the driver:
234 * Handle the network interface interrupts.
235 */
236
David Howells7d12e782006-10-05 14:55:46 +0100237static irqreturn_t de600_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
239 struct net_device *dev = dev_id;
240 u8 irq_status;
241 int retrig = 0;
242 int boguscount = 0;
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 spin_lock(&de600_lock);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 select_nic();
247 irq_status = de600_read_status(dev);
248
249 do {
Alexander Beregalov64303252009-05-15 10:22:39 +0000250 pr_debug("de600_interrupt (%02X)\n", irq_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 if (irq_status & RX_GOOD)
253 de600_rx_intr(dev);
254 else if (!(irq_status & RX_BUSY))
255 de600_put_command(RX_ENABLE);
256
257 /* Any transmission in progress? */
258 if (free_tx_pages < TX_PAGES)
259 retrig = de600_tx_intr(dev, irq_status);
260 else
261 retrig = 0;
262
263 irq_status = de600_read_status(dev);
264 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
265 /*
266 * Yeah, it _looks_ like busy waiting, smells like busy waiting
267 * and I know it's not PC, but please, it will only occur once
268 * in a while and then only for a loop or so (< 1ms for sure!)
269 */
270
271 /* Enable adapter interrupts */
272 select_prn();
273 if (retrig)
274 trigger_interrupt(dev);
275 spin_unlock(&de600_lock);
276 return IRQ_HANDLED;
277}
278
279static int de600_tx_intr(struct net_device *dev, int irq_status)
280{
281 /*
282 * Returns 1 if tx still not done
283 */
284
285 /* Check if current transmission is done yet */
286 if (irq_status & TX_BUSY)
287 return 1; /* tx not done, try again */
288
289 /* else */
290 /* If last transmission OK then bump fifo index */
291 if (!(irq_status & TX_FAILED16)) {
292 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
293 ++free_tx_pages;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700294 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 netif_wake_queue(dev);
296 }
297
298 /* More to send, or resend last packet? */
299 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
300 dev->trans_start = jiffies;
301 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
302 de600_put_command(TX_ENABLE);
303 return 1;
304 }
305 /* else */
306
307 return 0;
308}
309
310/*
311 * We have a good packet, get it out of the adapter.
312 */
313static void de600_rx_intr(struct net_device *dev)
314{
315 struct sk_buff *skb;
316 int i;
317 int read_from;
318 int size;
319 unsigned char *buffer;
320
321 /* Get size of received packet */
322 size = de600_read_byte(RX_LEN, dev); /* low byte */
323 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
324 size -= 4; /* Ignore trailing 4 CRC-bytes */
325
326 /* Tell adapter where to store next incoming packet, enable receiver */
327 read_from = rx_page_adr();
328 next_rx_page();
329 de600_put_command(RX_ENABLE);
330
331 if ((size < 32) || (size > 1535)) {
332 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
333 if (size > 10000)
334 adapter_init(dev);
335 return;
336 }
337
338 skb = dev_alloc_skb(size+2);
339 if (skb == NULL) {
340 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
341 return;
342 }
343 /* else */
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 skb_reserve(skb,2); /* Align */
346
347 /* 'skb->data' points to the start of sk_buff data area. */
348 buffer = skb_put(skb,size);
349
350 /* copy the packet into the buffer */
351 de600_setup_address(read_from, RW_ADDR);
352 for (i = size; i > 0; --i, ++buffer)
353 *buffer = de600_read_byte(READ_DATA, dev);
354
355 skb->protocol=eth_type_trans(skb,dev);
356
357 netif_rx(skb);
358
359 /* update stats */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700360 dev->stats.rx_packets++; /* count all receives */
361 dev->stats.rx_bytes += size; /* count all received bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 /*
364 * If any worth-while packets have been received, netif_rx()
365 * will work on them when we get to the tasklets.
366 */
367}
368
Stephen Hemmingerb8aa76a2009-01-07 17:34:36 -0800369static const struct net_device_ops de600_netdev_ops = {
370 .ndo_open = de600_open,
371 .ndo_stop = de600_close,
372 .ndo_start_xmit = de600_start_xmit,
373 .ndo_change_mtu = eth_change_mtu,
374 .ndo_set_mac_address = eth_mac_addr,
375 .ndo_validate_addr = eth_validate_addr,
376};
377
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379static struct net_device * __init de600_probe(void)
380{
381 int i;
382 struct net_device *dev;
383 int err;
384
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700385 dev = alloc_etherdev(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (!dev)
387 return ERR_PTR(-ENOMEM);
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 if (!request_region(DE600_IO, 3, "de600")) {
391 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
392 err = -EBUSY;
393 goto out;
394 }
395
396 printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
397 /* Alpha testers must have the version number to report bugs. */
Alexander Beregalov64303252009-05-15 10:22:39 +0000398 pr_debug("%s", version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 /* probe for adapter */
401 err = -ENODEV;
402 rx_page = 0;
403 select_nic();
404 (void)de600_read_status(dev);
405 de600_put_command(RESET);
406 de600_put_command(STOP_RESET);
407 if (de600_read_status(dev) & 0xf0) {
408 printk(": not at I/O %#3x.\n", DATA_PORT);
409 goto out1;
410 }
411
412 /*
413 * Maybe we found one,
414 * have to check if it is a D-Link DE-600 adapter...
415 */
416
417 /* Get the adapter ethernet address from the ROM */
418 de600_setup_address(NODE_ADDRESS, RW_ADDR);
419 for (i = 0; i < ETH_ALEN; i++) {
420 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
421 dev->broadcast[i] = 0xff;
422 }
423
424 /* Check magic code */
425 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
426 /* OK, install real address */
427 dev->dev_addr[0] = 0x00;
428 dev->dev_addr[1] = 0x80;
429 dev->dev_addr[2] = 0xc8;
430 dev->dev_addr[3] &= 0x0f;
431 dev->dev_addr[3] |= 0x70;
432 } else {
433 printk(" not identified in the printer port\n");
434 goto out1;
435 }
436
Johannes Berge1749612008-10-27 15:59:26 -0700437 printk(", Ethernet Address: %pM\n", dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Stephen Hemmingerb8aa76a2009-01-07 17:34:36 -0800439 dev->netdev_ops = &de600_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 dev->flags&=~IFF_MULTICAST;
442
443 select_prn();
444
445 err = register_netdev(dev);
446 if (err)
447 goto out1;
448
449 return dev;
450
451out1:
452 release_region(DE600_IO, 3);
453out:
454 free_netdev(dev);
455 return ERR_PTR(err);
456}
457
458static int adapter_init(struct net_device *dev)
459{
460 int i;
461
462 select_nic();
463 rx_page = 0; /* used by RESET */
464 de600_put_command(RESET);
465 de600_put_command(STOP_RESET);
466
467 /* Check if it is still there... */
468 /* Get the some bytes of the adapter ethernet address from the ROM */
469 de600_setup_address(NODE_ADDRESS, RW_ADDR);
470 de600_read_byte(READ_DATA, dev);
471 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
472 (de600_read_byte(READ_DATA, dev) != 0x15)) {
473 /* was: if (de600_read_status(dev) & 0xf0) { */
474 printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
475 /* Goodbye, cruel world... */
476 dev->flags &= ~IFF_UP;
477 de600_close(dev);
478 was_down = 1;
479 netif_stop_queue(dev); /* Transmit busy... */
480 return 1; /* failed */
481 }
482
483 if (was_down) {
484 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
485 was_down = 0;
486 }
487
488 tx_fifo_in = 0;
489 tx_fifo_out = 0;
490 free_tx_pages = TX_PAGES;
491
492
493 /* set the ether address. */
494 de600_setup_address(NODE_ADDRESS, RW_ADDR);
495 for (i = 0; i < ETH_ALEN; i++)
496 de600_put_byte(dev->dev_addr[i]);
497
498 /* where to start saving incoming packets */
499 rx_page = RX_BP | RX_BASE_PAGE;
500 de600_setup_address(MEM_4K, RW_ADDR);
501 /* Enable receiver */
502 de600_put_command(RX_ENABLE);
503 select_prn();
504
505 netif_start_queue(dev);
506
507 return 0; /* OK */
508}
509
510static struct net_device *de600_dev;
511
512static int __init de600_init(void)
513{
514 de600_dev = de600_probe();
515 if (IS_ERR(de600_dev))
516 return PTR_ERR(de600_dev);
517 return 0;
518}
519
520static void __exit de600_exit(void)
521{
522 unregister_netdev(de600_dev);
523 release_region(DE600_IO, 3);
524 free_netdev(de600_dev);
525}
526
527module_init(de600_init);
528module_exit(de600_exit);
529
530MODULE_LICENSE("GPL");