summaryrefslogtreecommitdiffstats
path: root/drivers/net/ni5010.c
blob: 1dc74a78afa6985951ed1820c78916736a2b477a (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
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
/*	ni5010.c: A network driver for the MiCom-Interlan NI5010 ethercard.
 *
 *	Copyright 1996,1997,2006 Jan-Pascal van Best and Andreas Mohr.
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU General Public License, incorporated herein by reference.
 *
 * 	The authors may be reached as:
 *		janpascal@vanbest.org		andi@lisas.de
 *
 *	Sources:
 * 	 	Donald Becker's "skeleton.c"
 *  		Crynwr ni5010 packet driver
 *
 *	Changes:
 *		v0.0: First test version
 *		v0.1: First working version
 *		v0.2:
 *		v0.3->v0.90: Now demand setting io and irq when loading as module
 *	970430	v0.91: modified for Linux 2.1.14
 *		v0.92: Implemented Andreas' (better) NI5010 probe
 *	970503	v0.93: Fixed auto-irq failure on warm reboot (JB)
 *	970623	v1.00: First kernel version (AM)
 *	970814	v1.01: Added detection of onboard receive buffer size (AM)
 *	060611	v1.02: slight cleanup: email addresses, driver modernization.
 *	Bugs:
 *		- not SMP-safe (no locking of I/O accesses)
 *		- Note that you have to patch ifconfig for the new /proc/net/dev
 *		format. It gives incorrect stats otherwise.
 *
 *	To do:
 *		Fix all bugs :-)
 *		Move some stuff to chipset_init()
 *		Handle xmt errors other than collisions
 *		Complete merge with Andreas' driver
 *		Implement ring buffers (Is this useful? You can't squeeze
 *			too many packet in a 2k buffer!)
 *		Implement DMA (Again, is this useful? Some docs say DMA is
 *			slower than programmed I/O)
 *
 *	Compile with:
 *		gcc -O2 -fomit-frame-pointer -m486 -D__KERNEL__ \
 *			-DMODULE -c ni5010.c
 *
 *	Insert with e.g.:
 *		insmod ni5010.ko io=0x300 irq=5
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include "ni5010.h"

static const char boardname[] = "NI5010";
static char version[] __initdata =
	"ni5010.c: v1.02 20060611 Jan-Pascal van Best and Andreas Mohr\n";

/* bufsize_rcv == 0 means autoprobing */
static unsigned int bufsize_rcv;

#define JUMPERED_INTERRUPTS	/* IRQ line jumpered on board */
#undef JUMPERED_DMA		/* No DMA used */
#undef FULL_IODETECT		/* Only detect in portlist */

#ifndef FULL_IODETECT
/* A zero-terminated list of I/O addresses to be probed. */
static unsigned int ports[] __initdata =
	{ 0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0 };
#endif

/* Use 0 for production, 1 for verification, >2 for debug */
#ifndef NI5010_DEBUG
#define NI5010_DEBUG 0
#endif

/* Information that needs to be kept for each board. */
struct ni5010_local {
	int o_pkt_size;
	spinlock_t lock;
};

/* Index to functions, as function prototypes. */

static int	ni5010_probe1(struct net_device *dev, int ioaddr);
static int	ni5010_open(struct net_device *dev);
static int	ni5010_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ni5010_interrupt(int irq, void *dev_id);
static void	ni5010_rx(struct net_device *dev);
static void	ni5010_timeout(struct net_device *dev);
static int	ni5010_close(struct net_device *dev);
static void 	ni5010_set_multicast_list(struct net_device *dev);
static void	reset_receiver(struct net_device *dev);

static int	process_xmt_interrupt(struct net_device *dev);
#define tx_done(dev) 1
static void	hardware_send_packet(struct net_device *dev, char *buf, int length, int pad);
static void 	chipset_init(struct net_device *dev, int startp);
static void	dump_packet(void *buf, int len);
static void 	ni5010_show_registers(struct net_device *dev);

static int io;
static int irq;

struct net_device * __init ni5010_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct ni5010_local));
	int *port;
	int err = 0;

	if (!dev)
		return ERR_PTR(-ENOMEM);

	if (unit >= 0) {
		sprintf(dev->name, "eth%d", unit);
		netdev_boot_setup_check(dev);
		io = dev->base_addr;
		irq = dev->irq;
	}

	PRINTK2((KERN_DEBUG "%s: Entering ni5010_probe\n", dev->name));

	if (io > 0x1ff)	{	/* Check a single specified location. */
		err = ni5010_probe1(dev, io);
	} else if (io != 0) {	/* Don't probe at all. */
		err = -ENXIO;
	} else {
#ifdef FULL_IODETECT
		for (io=0x200; io<0x400 && ni5010_probe1(dev, io) ; io+=0x20)
			;
		if (io == 0x400)
			err = -ENODEV;

#else
		for (port = ports; *port && ni5010_probe1(dev, *port); port++)
			;
		if (!*port)
			err = -ENODEV;
#endif	/* FULL_IODETECT */
	}
	if (err)
		goto out;
	err = register_netdev(dev);
	if (err)
		goto out1;
	return dev;
out1:
	release_region(dev->base_addr, NI5010_IO_EXTENT);
out:
	free_netdev(dev);
	return ERR_PTR(err);
}

static inline int rd_port(int ioaddr)
{
	inb(IE_RBUF);
	return inb(IE_SAPROM);
}

static void __init trigger_irq(int ioaddr)
{
		outb(0x00, EDLC_RESET);	/* Clear EDLC hold RESET state */
		outb(0x00, IE_RESET);	/* Board reset */
		outb(0x00, EDLC_XMASK);	/* Disable all Xmt interrupts */
		outb(0x00, EDLC_RMASK); /* Disable all Rcv interrupt */
		outb(0xff, EDLC_XCLR);	/* Clear all pending Xmt interrupts */
		outb(0xff, EDLC_RCLR);	/* Clear all pending Rcv interrupts */
		/*
		 * Transmit packet mode: Ignore parity, Power xcvr,
		 * 	Enable loopback
		 */
		outb(XMD_IG_PAR | XMD_T_MODE | XMD_LBC, EDLC_XMODE);
		outb(RMD_BROADCAST, EDLC_RMODE); /* Receive normal&broadcast */
		outb(XM_ALL, EDLC_XMASK);	/* Enable all Xmt interrupts */
		udelay(50);			/* FIXME: Necessary? */
		outb(MM_EN_XMT|MM_MUX, IE_MMODE); /* Start transmission */
}

/*
 *      This is the real probe routine.  Linux has a history of friendly device
 *      probes on the ISA bus.  A good device probes avoids doing writes, and
 *      verifies that the correct device exists and functions.
 */

static int __init ni5010_probe1(struct net_device *dev, int ioaddr)
{
	static unsigned version_printed;
	struct ni5010_local *lp;
	int i;
	unsigned int data = 0;
	int boguscount = 40;
	int err = -ENODEV;

	dev->base_addr = ioaddr;
	dev->irq = irq;

	if (!request_region(ioaddr, NI5010_IO_EXTENT, boardname))
		return -EBUSY;

	/*
	 * This is no "official" probe method, I've rather tested which
	 * probe works best with my seven NI5010 cards
	 * (they have very different serial numbers)
	 * Suggestions or failure reports are very, very welcome !
	 * But I think it is a relatively good probe method
	 * since it doesn't use any "outb"
	 * It should be nearly 100% reliable !
	 * well-known WARNING: this probe method (like many others)
	 * will hang the system if a NE2000 card region is probed !
	 *
	 *   - Andreas
	 */

 	PRINTK2((KERN_DEBUG "%s: entering ni5010_probe1(%#3x)\n",
 		dev->name, ioaddr));

	if (inb(ioaddr+0) == 0xff)
		goto out;

	while ( (rd_port(ioaddr) & rd_port(ioaddr) & rd_port(ioaddr) &
		 rd_port(ioaddr) & rd_port(ioaddr) & rd_port(ioaddr)) != 0xff)
	{
		if (boguscount-- == 0)
			goto out;
	}

	PRINTK2((KERN_DEBUG "%s: I/O #1 passed!\n", dev->name));

	for (i=0; i<32; i++)
		if ( (data = rd_port(ioaddr)) != 0xff) break;
	if (data==0xff)
		goto out;

	PRINTK2((KERN_DEBUG "%s: I/O #2 passed!\n", dev->name));

	if ((data != SA_ADDR0) || (rd_port(ioaddr) != SA_ADDR1) ||
	    (rd_port(ioaddr) != SA_ADDR2))
		goto out;

	for (i=0; i<4; i++)
		rd_port(ioaddr);

	if ( (rd_port(ioaddr) != NI5010_MAGICVAL1) ||
	     (rd_port(ioaddr) != NI5010_MAGICVAL2) )
		goto out;

	PRINTK2((KERN_DEBUG "%s: I/O #3 passed!\n", dev->name));

	if (NI5010_DEBUG && version_printed++ == 0)
		printk(KERN_INFO "%s", version);

	printk("NI5010 ethercard probe at 0x%x: ", ioaddr);

	dev->base_addr = ioaddr;

	for (i=0; i<6; i++) {
		outw(i, IE_GP);
		printk("%2.2x ", dev->dev_addr[i] = inb(IE_SAPROM));
	}

	PRINTK2((KERN_DEBUG "%s: I/O #4 passed!\n", dev->name));

#ifdef JUMPERED_INTERRUPTS
	if (dev->irq == 0xff)
		;
	else if (dev->irq < 2) {
		unsigned long irq_mask;

		PRINTK2((KERN_DEBUG "%s: I/O #5 passed!\n", dev->name));

		irq_mask = probe_irq_on();
		trigger_irq(ioaddr);
		mdelay(20);
		dev->irq = probe_irq_off(irq_mask);

		PRINTK2((KERN_DEBUG "%s: I/O #6 passed!\n", dev->name));

		if (dev->irq == 0) {
			err = -EAGAIN;
			printk(KERN_WARNING "%s: no IRQ found!\n", dev->name);
			goto out;
		}
		PRINTK2((KERN_DEBUG "%s: I/O #7 passed!\n", dev->name));
	} else if (dev->irq == 2) {
		dev->irq = 9;
	}
#endif	/* JUMPERED_INTERRUPTS */
	PRINTK2((KERN_DEBUG "%s: I/O #9 passed!\n", dev->name));

	/* DMA is not supported (yet?), so no use detecting it */
	lp = netdev_priv(dev);

	spin_lock_init(&lp->lock);

	PRINTK2((KERN_DEBUG "%s: I/O #10 passed!\n", dev->name));

/* get the size of the onboard receive buffer
 * higher addresses than bufsize are wrapped into real buffer
 * i.e. data for offs. 0x801 is written to 0x1 with a 2K onboard buffer
 */
	if (!bufsize_rcv) {
        	outb(1, IE_MMODE);      /* Put Rcv buffer on system bus */
        	outw(0, IE_GP);		/* Point GP at start of packet */
        	outb(0, IE_RBUF);	/* set buffer byte 0 to 0 */
        	for (i = 1; i < 0xff; i++) {
                	outw(i << 8, IE_GP); /* Point GP at packet size to be tested */
                	outb(i, IE_RBUF);
                	outw(0x0, IE_GP); /* Point GP at start of packet */
                	data = inb(IE_RBUF);
                	if (data == i) break;
        	}
		bufsize_rcv = i << 8;
        	outw(0, IE_GP);		/* Point GP at start of packet */
        	outb(0, IE_RBUF);	/* set buffer byte 0 to 0 again */
	}
        printk("-> bufsize rcv/xmt=%d/%d\n", bufsize_rcv, NI5010_BUFSIZE);
	memset(dev->priv, 0, sizeof(struct ni5010_local));

	dev->open		= ni5010_open;
	dev->stop		= ni5010_close;
	dev->hard_start_xmit	= ni5010_send_packet;
	dev->set_multicast_list = ni5010_set_multicast_list;
	dev->tx_timeout		= ni5010_timeout;
	dev->watchdog_timeo	= HZ/20;

	dev->flags &= ~IFF_MULTICAST;	/* Multicast doesn't work */

	/* Shut up the ni5010 */
	outb(0, EDLC_RMASK);	/* Mask all receive interrupts */
	outb(0, EDLC_XMASK);	/* Mask all xmit interrupts */
	outb(0xff, EDLC_RCLR);	/* Kill all pending rcv interrupts */
	outb(0xff, EDLC_XCLR); 	/* Kill all pending xmt interrupts */

	printk(KERN_INFO "%s: NI5010 found at 0x%x, using IRQ %d", dev->name, ioaddr, dev->irq);
	if (dev->dma)
		printk(" & DMA %d", dev->dma);
	printk(".\n");
	return 0;
out:
	release_region(dev->base_addr, NI5010_IO_EXTENT);
	return err;
}

/*
 * Open/initialize the board.  This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * 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 ni5010_open(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	int i;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_open()\n", dev->name));

	if (request_irq(dev->irq, &ni5010_interrupt, 0, boardname, dev)) {
		printk(KERN_WARNING "%s: Cannot get irq %#2x\n", dev->name, dev->irq);
		return -EAGAIN;
	}
	PRINTK3((KERN_DEBUG "%s: passed open() #1\n", dev->name));
        /*
         * Always allocate the DMA channel after the IRQ,
         * and clean up on failure.
         */
#ifdef JUMPERED_DMA
        if (request_dma(dev->dma, cardname)) {
		printk(KERN_WARNING "%s: Cannot get dma %#2x\n", dev->name, dev->dma);
                free_irq(dev->irq, NULL);
                return -EAGAIN;
        }
#endif	/* JUMPERED_DMA */

	PRINTK3((KERN_DEBUG "%s: passed open() #2\n", dev->name));
	/* Reset the hardware here.  Don't forget to set the station address. */

	outb(RS_RESET, EDLC_RESET);	/* Hold up EDLC_RESET while configing board */
	outb(0, IE_RESET);		/* Hardware reset of ni5010 board */
	outb(XMD_LBC, EDLC_XMODE);	/* Only loopback xmits */

	PRINTK3((KERN_DEBUG "%s: passed open() #3\n", dev->name));
	/* Set the station address */
	for(i = 0;i < 6; i++) {
		outb(dev->dev_addr[i], EDLC_ADDR + i);
	}

	PRINTK3((KERN_DEBUG "%s: Initialising ni5010\n", dev->name));
	outb(0, EDLC_XMASK);	/* No xmit interrupts for now */
	outb(XMD_IG_PAR | XMD_T_MODE | XMD_LBC, EDLC_XMODE);
				/* Normal packet xmit mode */
	outb(0xff, EDLC_XCLR);	/* Clear all pending xmit interrupts */
	outb(RMD_BROADCAST, EDLC_RMODE);
				/* Receive broadcast and normal packets */
	reset_receiver(dev);	/* Ready ni5010 for receiving packets */

	outb(0, EDLC_RESET);	/* Un-reset the ni5010 */

	netif_start_queue(dev);

	if (NI5010_DEBUG) ni5010_show_registers(dev);

	PRINTK((KERN_DEBUG "%s: open successful\n", dev->name));
     	return 0;
}

static void reset_receiver(struct net_device *dev)
{
	int ioaddr = dev->base_addr;

	PRINTK3((KERN_DEBUG "%s: resetting receiver\n", dev->name));
	outw(0, IE_GP);		/* Receive packet at start of buffer */
	outb(0xff, EDLC_RCLR);	/* Clear all pending rcv interrupts */
	outb(0, IE_MMODE);	/* Put EDLC to rcv buffer */
	outb(MM_EN_RCV, IE_MMODE); /* Enable rcv */
	outb(0xff, EDLC_RMASK);	/* Enable all rcv interrupts */
}

static void ni5010_timeout(struct net_device *dev)
{
	printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
		   tx_done(dev) ? "IRQ conflict" : "network cable problem");
	/* Try to restart the adaptor. */
	/* FIXME: Give it a real kick here */
	chipset_init(dev, 1);
	dev->trans_start = jiffies;
	netif_wake_queue(dev);
}

static int ni5010_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_send_packet\n", dev->name));

	/*
         * Block sending
	 */

	netif_stop_queue(dev);
	hardware_send_packet(dev, (unsigned char *)skb->data, skb->len, length-skb->len);
	dev->trans_start = jiffies;
	dev_kfree_skb (skb);
	return 0;
}

/*
 * The typical workload of the driver:
 * Handle the network interface interrupts.
 */
static irqreturn_t ni5010_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct ni5010_local *lp;
	int ioaddr, status;
	int xmit_was_error = 0;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_interrupt\n", dev->name));

	ioaddr = dev->base_addr;
	lp = netdev_priv(dev);

	spin_lock(&lp->lock);
	status = inb(IE_ISTAT);
	PRINTK3((KERN_DEBUG "%s: IE_ISTAT = %#02x\n", dev->name, status));

        if ((status & IS_R_INT) == 0) ni5010_rx(dev);

        if ((status & IS_X_INT) == 0) {
                xmit_was_error = process_xmt_interrupt(dev);
        }

        if ((status & IS_DMA_INT) == 0) {
                PRINTK((KERN_DEBUG "%s: DMA complete (?)\n", dev->name));
                outb(0, IE_DMA_RST); /* Reset DMA int */
        }

	if (!xmit_was_error)
		reset_receiver(dev);
	spin_unlock(&lp->lock);
	return IRQ_HANDLED;
}


static void dump_packet(void *buf, int len)
{
	int i;

	printk(KERN_DEBUG "Packet length = %#4x\n", len);
	for (i = 0; i < len; i++){
		if (i % 16 == 0) printk(KERN_DEBUG "%#4.4x", i);
		if (i % 2 == 0) printk(" ");
		printk("%2.2x", ((unsigned char *)buf)[i]);
		if (i % 16 == 15) printk("\n");
	}
	printk("\n");

	return;
}

/* We have a good packet, get it out of the buffer. */
static void ni5010_rx(struct net_device *dev)
{
	struct ni5010_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	unsigned char rcv_stat;
	struct sk_buff *skb;
	int i_pkt_size;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_rx()\n", dev->name));

	rcv_stat = inb(EDLC_RSTAT);
	PRINTK3((KERN_DEBUG "%s: EDLC_RSTAT = %#2x\n", dev->name, rcv_stat));

	if ( (rcv_stat & RS_VALID_BITS) != RS_PKT_OK) {
		PRINTK((KERN_INFO "%s: receive error.\n", dev->name));
		dev->stats.rx_errors++;
		if (rcv_stat & RS_RUNT) dev->stats.rx_length_errors++;
		if (rcv_stat & RS_ALIGN) dev->stats.rx_frame_errors++;
		if (rcv_stat & RS_CRC_ERR) dev->stats.rx_crc_errors++;
		if (rcv_stat & RS_OFLW) dev->stats.rx_fifo_errors++;
        	outb(0xff, EDLC_RCLR); /* Clear the interrupt */
		return;
	}

        outb(0xff, EDLC_RCLR);  /* Clear the interrupt */

	i_pkt_size = inw(IE_RCNT);
	if (i_pkt_size > ETH_FRAME_LEN || i_pkt_size < 10 ) {
		PRINTK((KERN_DEBUG "%s: Packet size error, packet size = %#4.4x\n",
			dev->name, i_pkt_size));
		dev->stats.rx_errors++;
		dev->stats.rx_length_errors++;
		return;
	}

	/* Malloc up new buffer. */
	skb = dev_alloc_skb(i_pkt_size + 3);
	if (skb == NULL) {
		printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
		dev->stats.rx_dropped++;
		return;
	}

	skb_reserve(skb, 2);

	/* Read packet into buffer */
        outb(MM_MUX, IE_MMODE); /* Rcv buffer to system bus */
	outw(0, IE_GP);	/* Seek to beginning of packet */
	insb(IE_RBUF, skb_put(skb, i_pkt_size), i_pkt_size);

	if (NI5010_DEBUG >= 4)
		dump_packet(skb->data, skb->len);

	skb->protocol = eth_type_trans(skb,dev);
	netif_rx(skb);
	dev->last_rx = jiffies;
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += i_pkt_size;

	PRINTK2((KERN_DEBUG "%s: Received packet, size=%#4.4x\n",
		dev->name, i_pkt_size));

}

static int process_xmt_interrupt(struct net_device *dev)
{
	struct ni5010_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	int xmit_stat;

	PRINTK2((KERN_DEBUG "%s: entering process_xmt_interrupt\n", dev->name));

	xmit_stat = inb(EDLC_XSTAT);
	PRINTK3((KERN_DEBUG "%s: EDLC_XSTAT = %2.2x\n", dev->name, xmit_stat));

	outb(0, EDLC_XMASK);	/* Disable xmit IRQ's */
	outb(0xff, EDLC_XCLR);	/* Clear all pending xmit IRQ's */

	if (xmit_stat & XS_COLL){
		PRINTK((KERN_DEBUG "%s: collision detected, retransmitting\n",
			dev->name));
		outw(NI5010_BUFSIZE - lp->o_pkt_size, IE_GP);
		/* outb(0, IE_MMODE); */ /* xmt buf on sysbus FIXME: needed ? */
		outb(MM_EN_XMT | MM_MUX, IE_MMODE);
		outb(XM_ALL, EDLC_XMASK); /* Enable xmt IRQ's */
		dev->stats.collisions++;
		return 1;
	}

	/* FIXME: handle other xmt error conditions */

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += lp->o_pkt_size;
	netif_wake_queue(dev);

	PRINTK2((KERN_DEBUG "%s: sent packet, size=%#4.4x\n",
		dev->name, lp->o_pkt_size));

	return 0;
}

/* The inverse routine to ni5010_open(). */
static int ni5010_close(struct net_device *dev)
{
	int ioaddr = dev->base_addr;

	PRINTK2((KERN_DEBUG "%s: entering ni5010_close\n", dev->name));
#ifdef JUMPERED_INTERRUPTS
	free_irq(dev->irq, NULL);
#endif
	/* Put card in held-RESET state */
	outb(0, IE_MMODE);
	outb(RS_RESET, EDLC_RESET);

	netif_stop_queue(dev);

	PRINTK((KERN_DEBUG "%s: %s closed down\n", dev->name, boardname));
	return 0;

}

/* Set or clear the multicast filter for this adaptor.
   num_addrs == -1      Promiscuous mode, receive all packets
   num_addrs == 0       Normal mode, clear multicast list
   num_addrs > 0        Multicast mode, receive normal and MC packets, and do
                        best-effort filtering.
*/
static void ni5010_set_multicast_list(struct net_device *dev)
{
	short ioaddr = dev->base_addr;

	PRINTK2((KERN_DEBUG "%s: entering set_multicast_list\n", dev->name));

	if (dev->flags&IFF_PROMISC || dev->flags&IFF_ALLMULTI || dev->mc_list) {
		dev->flags |= IFF_PROMISC;
		outb(RMD_PROMISC, EDLC_RMODE); /* Enable promiscuous mode */
		PRINTK((KERN_DEBUG "%s: Entering promiscuous mode\n", dev->name));
	} else {
		PRINTK((KERN_DEBUG "%s: Entering broadcast mode\n", dev->name));
		outb(RMD_BROADCAST, EDLC_RMODE);  /* Disable promiscuous mode, use normal mode */
	}
}

static void hardware_send_packet(struct net_device *dev, char *buf, int length, int pad)
{
	struct ni5010_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	unsigned long flags;
	unsigned int buf_offs;

	PRINTK2((KERN_DEBUG "%s: entering hardware_send_packet\n", dev->name));

        if (length > ETH_FRAME_LEN) {
                PRINTK((KERN_WARNING "%s: packet too large, not possible\n",
                        dev->name));
                return;
        }

	if (NI5010_DEBUG) ni5010_show_registers(dev);

	if (inb(IE_ISTAT) & IS_EN_XMT) {
		PRINTK((KERN_WARNING "%s: sending packet while already transmitting, not possible\n",
			dev->name));
		return;
	}

	if (NI5010_DEBUG > 3) dump_packet(buf, length);

	buf_offs = NI5010_BUFSIZE - length - pad;

	spin_lock_irqsave(&lp->lock, flags);
	lp->o_pkt_size = length + pad;

	outb(0, EDLC_RMASK);	/* Mask all receive interrupts */
	outb(0, IE_MMODE);	/* Put Xmit buffer on system bus */
	outb(0xff, EDLC_RCLR);	/* Clear out pending rcv interrupts */

	outw(buf_offs, IE_GP); /* Point GP at start of packet */
	outsb(IE_XBUF, buf, length); /* Put data in buffer */
	while(pad--)
		outb(0, IE_XBUF);

	outw(buf_offs, IE_GP); /* Rewrite where packet starts */

	/* should work without that outb() (Crynwr used it) */
	/*outb(MM_MUX, IE_MMODE);*/ /* Xmt buffer to EDLC bus */
	outb(MM_EN_XMT | MM_MUX, IE_MMODE); /* Begin transmission */
	outb(XM_ALL, EDLC_XMASK); /* Cause interrupt after completion or fail */

	spin_unlock_irqrestore(&lp->lock, flags);

	netif_wake_queue(dev);

	if (NI5010_DEBUG) ni5010_show_registers(dev);
}

static void chipset_init(struct net_device *dev, int startp)
{
	/* FIXME: Move some stuff here */
	PRINTK3((KERN_DEBUG "%s: doing NOTHING in chipset_init\n", dev->name));
}

static void ni5010_show_registers(struct net_device *dev)
{
	int ioaddr = dev->base_addr;

	PRINTK3((KERN_DEBUG "%s: XSTAT %#2.2x\n", dev->name, inb(EDLC_XSTAT)));
	PRINTK3((KERN_DEBUG "%s: XMASK %#2.2x\n", dev->name, inb(EDLC_XMASK)));
	PRINTK3((KERN_DEBUG "%s: RSTAT %#2.2x\n", dev->name, inb(EDLC_RSTAT)));
	PRINTK3((KERN_DEBUG "%s: RMASK %#2.2x\n", dev->name, inb(EDLC_RMASK)));
	PRINTK3((KERN_DEBUG "%s: RMODE %#2.2x\n", dev->name, inb(EDLC_RMODE)));
	PRINTK3((KERN_DEBUG "%s: XMODE %#2.2x\n", dev->name, inb(EDLC_XMODE)));
	PRINTK3((KERN_DEBUG "%s: ISTAT %#2.2x\n", dev->name, inb(IE_ISTAT)));
}

#ifdef MODULE
static struct net_device *dev_ni5010;

module_param(io, int, 0);
module_param(irq, int, 0);
MODULE_PARM_DESC(io, "ni5010 I/O base address");
MODULE_PARM_DESC(irq, "ni5010 IRQ number");

static int __init ni5010_init_module(void)
{
	PRINTK2((KERN_DEBUG "%s: entering init_module\n", boardname));
	/*
	if(io <= 0 || irq == 0){
	   	printk(KERN_WARNING "%s: Autoprobing not allowed for modules.\n", boardname);
		printk(KERN_WARNING "%s: Set symbols 'io' and 'irq'\n", boardname);
	   	return -EINVAL;
	}
	*/
	if (io <= 0){
		printk(KERN_WARNING "%s: Autoprobing for modules is hazardous, trying anyway..\n", boardname);
	}

	PRINTK2((KERN_DEBUG "%s: init_module irq=%#2x, io=%#3x\n", boardname, irq, io));
	dev_ni5010 = ni5010_probe(-1);
	if (IS_ERR(dev_ni5010))
		return PTR_ERR(dev_ni5010);
        return 0;
}

static void __exit ni5010_cleanup_module(void)
{
	PRINTK2((KERN_DEBUG "%s: entering cleanup_module\n", boardname));
	unregister_netdev(dev_ni5010);
	release_region(dev_ni5010->base_addr, NI5010_IO_EXTENT);
	free_netdev(dev_ni5010);
}
module_init(ni5010_init_module);
module_exit(ni5010_cleanup_module);
#endif /* MODULE */
MODULE_LICENSE("GPL");

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c ni5010.c"
 *  version-control: t
 *  kept-new-versions: 5
 *  tab-width: 4
 * End:
 */
OpenPOWER on IntegriCloud