aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/de600.c
blob: c866ca99a068932ecb61c6d85f97a61e5f217bd8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
static const char version[] = "de600.c: $Revision: 1.41-2.5 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
/*
 *	de600.c
 *
 *	Linux driver for the D-Link DE-600 Ethernet pocket adapter.
 *
 *	Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
 *	The Author may be reached as bj0rn@blox.se
 *
 *	Based on adapter information gathered from DE600.ASM by D-Link Inc.,
 *	as included on disk C in the v.2.11 of PC/TCP from FTP Software.
 *	For DE600.asm:
 *		Portions (C) Copyright 1990 D-Link, Inc.
 *		Copyright, 1988-1992, Russell Nelson, Crynwr Software
 *
 *	Adapted to the sample network driver core for linux,
 *	written by: Donald Becker <becker@super.org>
 *		(Now at <becker@scyld.com>)
 *
 **************************************************************/
/*
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2, or (at your option)
 *	any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 **************************************************************/

/* Add more time here if your adapter won't work OK: */
#define DE600_SLOW_DOWN	udelay(delay_time)

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <asm/io.h>

#include "de600.h"

static unsigned int check_lost = 1;
module_param(check_lost, bool, 0);
MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");

static unsigned int delay_time = 10;
module_param(delay_time, int, 0);
MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");


/*
 * D-Link driver variables:
 */

static volatile int		rx_page;

#define TX_PAGES 2
static volatile int		tx_fifo[TX_PAGES];
static volatile int		tx_fifo_in;
static volatile int		tx_fifo_out;
static volatile int		free_tx_pages = TX_PAGES;
static int			was_down;
static DEFINE_SPINLOCK(de600_lock);

static inline u8 de600_read_status(struct net_device *dev)
{
	u8 status;

	outb_p(STATUS, DATA_PORT);
	status = inb(STATUS_PORT);
	outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);

	return status;
}

static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
{
	/* dev used by macros */
	u8 lo;
	outb_p((type), DATA_PORT);
	lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
	outb_p((type) | HI_NIBBLE, DATA_PORT);
	return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
}

/*
 * Open/initialize the board.  This is called (in the current kernel)
 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is a non-reboot way to recover if something goes wrong.
 */

static int de600_open(struct net_device *dev)
{
	unsigned long flags;
	int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
	if (ret) {
		printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
		return ret;
	}
	spin_lock_irqsave(&de600_lock, flags);
	ret = adapter_init(dev);
	spin_unlock_irqrestore(&de600_lock, flags);
	return ret;
}

/*
 * The inverse routine to de600_open().
 */

static int de600_close(struct net_device *dev)
{
	select_nic();
	rx_page = 0;
	de600_put_command(RESET);
	de600_put_command(STOP_RESET);
	de600_put_command(0);
	select_prn();
	free_irq(DE600_IRQ, dev);
	return 0;
}

static inline void trigger_interrupt(struct net_device *dev)
{
	de600_put_command(FLIP_IRQ);
	select_prn();
	DE600_SLOW_DOWN;
	select_nic();
	de600_put_command(0);
}

/*
 * Copy a buffer to the adapter transmit page memory.
 * Start sending.
 */

static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	unsigned long flags;
	int	transmit_from;
	int	len;
	int	tickssofar;
	u8	*buffer = skb->data;
	int	i;

	if (free_tx_pages <= 0) {	/* Do timeouts, to avoid hangs. */
		tickssofar = jiffies - dev->trans_start;
		if (tickssofar < 5)
			return 1;
		/* else */
		printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
		/* Restart the adapter. */
		spin_lock_irqsave(&de600_lock, flags);
		if (adapter_init(dev)) {
			spin_unlock_irqrestore(&de600_lock, flags);
			return 1;
		}
		spin_unlock_irqrestore(&de600_lock, flags);
	}

	/* Start real output */
	pr_debug("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages);

	if ((len = skb->len) < RUNT)
		len = RUNT;

	spin_lock_irqsave(&de600_lock, flags);
	select_nic();
	tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
	tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */

	if(check_lost)
	{
		/* This costs about 40 instructions per packet... */
		de600_setup_address(NODE_ADDRESS, RW_ADDR);
		de600_read_byte(READ_DATA, dev);
		if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
			if (adapter_init(dev)) {
				spin_unlock_irqrestore(&de600_lock, flags);
				return 1;
			}
		}
	}

	de600_setup_address(transmit_from, RW_ADDR);
	for (i = 0;  i < skb->len ; ++i, ++buffer)
		de600_put_byte(*buffer);
	for (; i < len; ++i)
		de600_put_byte(0);

	if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
		dev->trans_start = jiffies;
		netif_start_queue(dev); /* allow more packets into adapter */
		/* Send page and generate a faked interrupt */
		de600_setup_address(transmit_from, TX_ADDR);
		de600_put_command(TX_ENABLE);
	}
	else {
		if (free_tx_pages)
			netif_start_queue(dev);
		else
			netif_stop_queue(dev);
		select_prn();
	}
	spin_unlock_irqrestore(&de600_lock, flags);
	dev_kfree_skb(skb);
	return 0;
}

/*
 * The typical workload of the driver:
 * Handle the network interface interrupts.
 */

static irqreturn_t de600_interrupt(int irq, void *dev_id)
{
	struct net_device	*dev = dev_id;
	u8		irq_status;
	int		retrig = 0;
	int		boguscount = 0;

	spin_lock(&de600_lock);

	select_nic();
	irq_status = de600_read_status(dev);

	do {
		pr_debug("de600_interrupt (%02X)\n", irq_status);

		if (irq_status & RX_GOOD)
			de600_rx_intr(dev);
		else if (!(irq_status & RX_BUSY))
			de600_put_command(RX_ENABLE);

		/* Any transmission in progress? */
		if (free_tx_pages < TX_PAGES)
			retrig = de600_tx_intr(dev, irq_status);
		else
			retrig = 0;

		irq_status = de600_read_status(dev);
	} while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
	/*
	 * Yeah, it _looks_ like busy waiting, smells like busy waiting
	 * and I know it's not PC, but please, it will only occur once
	 * in a while and then only for a loop or so (< 1ms for sure!)
	 */

	/* Enable adapter interrupts */
	select_prn();
	if (retrig)
		trigger_interrupt(dev);
	spin_unlock(&de600_lock);
	return IRQ_HANDLED;
}

static int de600_tx_intr(struct net_device *dev, int irq_status)
{
	/*
	 * Returns 1 if tx still not done
	 */

	/* Check if current transmission is done yet */
	if (irq_status & TX_BUSY)
		return 1; /* tx not done, try again */

	/* else */
	/* If last transmission OK then bump fifo index */
	if (!(irq_status & TX_FAILED16)) {
		tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
		++free_tx_pages;
		dev->stats.tx_packets++;
		netif_wake_queue(dev);
	}

	/* More to send, or resend last packet? */
	if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
		dev->trans_start = jiffies;
		de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
		de600_put_command(TX_ENABLE);
		return 1;
	}
	/* else */

	return 0;
}

/*
 * We have a good packet, get it out of the adapter.
 */
static void de600_rx_intr(struct net_device *dev)
{
	struct sk_buff	*skb;
	int		i;
	int		read_from;
	int		size;
	unsigned char	*buffer;

	/* Get size of received packet */
	size = de600_read_byte(RX_LEN, dev);	/* low byte */
	size += (de600_read_byte(RX_LEN, dev) << 8);	/* high byte */
	size -= 4;	/* Ignore trailing 4 CRC-bytes */

	/* Tell adapter where to store next incoming packet, enable receiver */
	read_from = rx_page_adr();
	next_rx_page();
	de600_put_command(RX_ENABLE);

	if ((size < 32)  ||  (size > 1535)) {
		printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
		if (size > 10000)
			adapter_init(dev);
		return;
	}

	skb = dev_alloc_skb(size+2);
	if (skb == NULL) {
		printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
		return;
	}
	/* else */

	skb_reserve(skb,2);	/* Align */

	/* 'skb->data' points to the start of sk_buff data area. */
	buffer = skb_put(skb,size);

	/* copy the packet into the buffer */
	de600_setup_address(read_from, RW_ADDR);
	for (i = size; i > 0; --i, ++buffer)
		*buffer = de600_read_byte(READ_DATA, dev);

	skb->protocol=eth_type_trans(skb,dev);

	netif_rx(skb);

	/* update stats */
	dev->stats.rx_packets++; /* count all receives */
	dev->stats.rx_bytes += size; /* count all received bytes */

	/*
	 * If any worth-while packets have been received, netif_rx()
	 * will work on them when we get to the tasklets.
	 */
}

static const struct net_device_ops de600_netdev_ops = {
	.ndo_open		= de600_open,
	.ndo_stop		= de600_close,
	.ndo_start_xmit		= de600_start_xmit,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};


static struct net_device * __init de600_probe(void)
{
	int	i;
	struct net_device *dev;
	int err;

	dev = alloc_etherdev(0);
	if (!dev)
		return ERR_PTR(-ENOMEM);


	if (!request_region(DE600_IO, 3, "de600")) {
		printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
		err = -EBUSY;
		goto out;
	}

	printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
	/* Alpha testers must have the version number to report bugs. */
	pr_debug("%s", version);

	/* probe for adapter */
	err = -ENODEV;
	rx_page = 0;
	select_nic();
	(void)de600_read_status(dev);
	de600_put_command(RESET);
	de600_put_command(STOP_RESET);
	if (de600_read_status(dev) & 0xf0) {
		printk(": not at I/O %#3x.\n", DATA_PORT);
		goto out1;
	}

	/*
	 * Maybe we found one,
	 * have to check if it is a D-Link DE-600 adapter...
	 */

	/* Get the adapter ethernet address from the ROM */
	de600_setup_address(NODE_ADDRESS, RW_ADDR);
	for (i = 0; i < ETH_ALEN; i++) {
		dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
		dev->broadcast[i] = 0xff;
	}

	/* Check magic code */
	if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
		/* OK, install real address */
		dev->dev_addr[0] = 0x00;
		dev->dev_addr[1] = 0x80;
		dev->dev_addr[2] = 0xc8;
		dev->dev_addr[3] &= 0x0f;
		dev->dev_addr[3] |= 0x70;
	} else {
		printk(" not identified in the printer port\n");
		goto out1;
	}

	printk(", Ethernet Address: %pM\n", dev->dev_addr);

	dev->netdev_ops = &de600_netdev_ops;

	dev->flags&=~IFF_MULTICAST;

	select_prn();

	err = register_netdev(dev);
	if (err)
		goto out1;

	return dev;

out1:
	release_region(DE600_IO, 3);
out:
	free_netdev(dev);
	return ERR_PTR(err);
}

static int adapter_init(struct net_device *dev)
{
	int	i;

	select_nic();
	rx_page = 0; /* used by RESET */
	de600_put_command(RESET);
	de600_put_command(STOP_RESET);

	/* Check if it is still there... */
	/* Get the some bytes of the adapter ethernet address from the ROM */
	de600_setup_address(NODE_ADDRESS, RW_ADDR);
	de600_read_byte(READ_DATA, dev);
	if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
	    (de600_read_byte(READ_DATA, dev) != 0x15)) {
	/* was: if (de600_read_status(dev) & 0xf0) { */
		printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
		/* Goodbye, cruel world... */
		dev->flags &= ~IFF_UP;
		de600_close(dev);
		was_down = 1;
		netif_stop_queue(dev); /* Transmit busy...  */
		return 1; /* failed */
	}

	if (was_down) {
		printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
		was_down = 0;
	}

	tx_fifo_in = 0;
	tx_fifo_out = 0;
	free_tx_pages = TX_PAGES;


	/* set the ether address. */
	de600_setup_address(NODE_ADDRESS, RW_ADDR);
	for (i = 0; i < ETH_ALEN; i++)
		de600_put_byte(dev->dev_addr[i]);

	/* where to start saving incoming packets */
	rx_page = RX_BP | RX_BASE_PAGE;
	de600_setup_address(MEM_4K, RW_ADDR);
	/* Enable receiver */
	de600_put_command(RX_ENABLE);
	select_prn();

	netif_start_queue(dev);

	return 0; /* OK */
}

static struct net_device *de600_dev;

static int __init de600_init(void)
{
	de600_dev = de600_probe();
	if (IS_ERR(de600_dev))
		return PTR_ERR(de600_dev);
	return 0;
}

static void __exit de600_exit(void)
{
	unregister_netdev(de600_dev);
	release_region(DE600_IO, 3);
	free_netdev(de600_dev);
}

module_init(de600_init);
module_exit(de600_exit);

MODULE_LICENSE("GPL");