Free Electrons

Embedded Linux Experts

  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
/*
 *	Sealevel Systems 4021 driver.
 *
 *	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 of the License, or (at your option) any later version.
 *
 *	(c) Copyright 1999, 2001 Alan Cox
 *	(c) Copyright 2001 Red Hat Inc.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <net/arp.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <net/syncppp.h>
#include "z85230.h"


struct slvl_device
{
	void *if_ptr;	/* General purpose pointer (used by SPPP) */
	struct z8530_channel *chan;
	struct ppp_device pppdev;
	int channel;
};


struct slvl_board
{
	struct slvl_device *dev[2];
	struct z8530_dev board;
	int iobase;
};

/*
 *	Network driver support routines
 */

/*
 *	Frame receive. Simple for our card as we do sync ppp and there
 *	is no funny garbage involved
 */
 
static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
{
	/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
	skb_trim(skb, skb->len-2);
	skb->protocol=htons(ETH_P_WAN_PPP);
	skb->mac.raw=skb->data;
	skb->dev=c->netdevice;
	/*
	 *	Send it to the PPP layer. We don't have time to process
	 *	it right now.
	 */
	netif_rx(skb);
	c->netdevice->last_rx = jiffies;
}
 
/*
 *	We've been placed in the UP state
 */ 
 
static int sealevel_open(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	int err = -1;
	int unit = slvl->channel;
	
	/*
	 *	Link layer up. 
	 */

	switch(unit)
	{
		case 0:
			err=z8530_sync_dma_open(d, slvl->chan);
			break;
		case 1:
			err=z8530_sync_open(d, slvl->chan);
			break;
	}
	
	if(err)
		return err;
	/*
	 *	Begin PPP
	 */
	err=sppp_open(d);
	if(err)
	{
		switch(unit)
		{
			case 0:
				z8530_sync_dma_close(d, slvl->chan);
				break;
			case 1:
				z8530_sync_close(d, slvl->chan);
				break;
		}				
		return err;
	}
	
	slvl->chan->rx_function=sealevel_input;
	
	/*
	 *	Go go go
	 */
	netif_start_queue(d);
	return 0;
}

static int sealevel_close(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	int unit = slvl->channel;
	
	/*
	 *	Discard new frames
	 */
	
	slvl->chan->rx_function=z8530_null_rx;
		
	/*
	 *	PPP off
	 */
	sppp_close(d);
	/*
	 *	Link layer down
	 */

	netif_stop_queue(d);
		
	switch(unit)
	{
		case 0:
			z8530_sync_dma_close(d, slvl->chan);
			break;
		case 1:
			z8530_sync_close(d, slvl->chan);
			break;
	}
	return 0;
}

static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
{
	/* struct slvl_device *slvl=d->priv;
	   z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
	return sppp_do_ioctl(d, ifr,cmd);
}

static struct net_device_stats *sealevel_get_stats(struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	if(slvl)
		return z8530_get_stats(slvl->chan);
	else
		return NULL;
}

/*
 *	Passed PPP frames, fire them downwind.
 */
 
static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
{
	struct slvl_device *slvl=d->priv;
	return z8530_queue_xmit(slvl->chan, skb);
}

static int sealevel_neigh_setup(struct neighbour *n)
{
	if (n->nud_state == NUD_NONE) {
		n->ops = &arp_broken_ops;
		n->output = n->ops->output;
	}
	return 0;
}

static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
{
	if (p->tbl->family == AF_INET) {
		p->neigh_setup = sealevel_neigh_setup;
		p->ucast_probes = 0;
		p->mcast_probes = 0;
	}
	return 0;
}

static int sealevel_attach(struct net_device *dev)
{
	struct slvl_device *sv = dev->priv;
	sppp_attach(&sv->pppdev);
	return 0;
}

static void sealevel_detach(struct net_device *dev)
{
	sppp_detach(dev);
}
		
static void slvl_setup(struct net_device *d)
{
	d->open = sealevel_open;
	d->stop = sealevel_close;
	d->init = sealevel_attach;
	d->uninit = sealevel_detach;
	d->hard_start_xmit = sealevel_queue_xmit;
	d->get_stats = sealevel_get_stats;
	d->set_multicast_list = NULL;
	d->do_ioctl = sealevel_ioctl;
	d->neigh_setup = sealevel_neigh_setup_dev;
	d->set_mac_address = NULL;

}

static inline struct slvl_device *slvl_alloc(int iobase, int irq)
{
	struct net_device *d;
	struct slvl_device *sv;

	d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d",
			 slvl_setup);

	if (!d) 
		return NULL;

	sv = d->priv;
	sv->if_ptr = &sv->pppdev;
	sv->pppdev.dev = d;
	d->base_addr = iobase;
	d->irq = irq;
		
	return sv;
}


/*
 *	Allocate and setup Sealevel board.
 */
 
static __init struct slvl_board *slvl_init(int iobase, int irq, 
					   int txdma, int rxdma, int slow)
{
	struct z8530_dev *dev;
	struct slvl_board *b;
	
	/*
	 *	Get the needed I/O space
	 */

	if(!request_region(iobase, 8, "Sealevel 4021")) 
	{	
		printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
		return NULL;
	}
	
	b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
	if(!b)
		goto fail3;

	memset(b, 0, sizeof(*b));
	if (!(b->dev[0]= slvl_alloc(iobase, irq)))
		goto fail2;

	b->dev[0]->chan = &b->board.chanA;	
	b->dev[0]->channel = 0;
	
	if (!(b->dev[1] = slvl_alloc(iobase, irq)))
		goto fail1_0;

	b->dev[1]->chan = &b->board.chanB;
	b->dev[1]->channel = 1;

	dev = &b->board;
	
	/*
	 *	Stuff in the I/O addressing
	 */
	 
	dev->active = 0;

	b->iobase = iobase;
	
	/*
	 *	Select 8530 delays for the old board
	 */
	 
	if(slow)
		iobase |= Z8530_PORT_SLEEP;
		
	dev->chanA.ctrlio=iobase+1;
	dev->chanA.dataio=iobase;
	dev->chanB.ctrlio=iobase+3;
	dev->chanB.dataio=iobase+2;
	
	dev->chanA.irqs=&z8530_nop;
	dev->chanB.irqs=&z8530_nop;
	
	/*
	 *	Assert DTR enable DMA
	 */
	 
	outb(3|(1<<7), b->iobase+4);	
	

	/* We want a fast IRQ for this device. Actually we'd like an even faster
	   IRQ ;) - This is one driver RtLinux is made for */
   
	if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
	{
		printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
		goto fail1_1;
	}
	
	dev->irq=irq;
	dev->chanA.private=&b->dev[0];
	dev->chanB.private=&b->dev[1];
	dev->chanA.netdevice=b->dev[0]->pppdev.dev;
	dev->chanB.netdevice=b->dev[1]->pppdev.dev;
	dev->chanA.dev=dev;
	dev->chanB.dev=dev;

	dev->chanA.txdma=3;
	dev->chanA.rxdma=1;
	if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
		goto fail;
		
	if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
		goto dmafail;
	
	disable_irq(irq);
		
	/*
	 *	Begin normal initialise
	 */
	 
	if(z8530_init(dev)!=0)
	{
		printk(KERN_ERR "Z8530 series device not found.\n");
		enable_irq(irq);
		goto dmafail2;
	}
	if(dev->type==Z85C30)
	{
		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
		z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
	}
	else
	{
		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
		z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
	}

	/*
	 *	Now we can take the IRQ
	 */
	
	enable_irq(irq);

	if (register_netdev(b->dev[0]->pppdev.dev)) 
		goto dmafail2;
		
	if (register_netdev(b->dev[1]->pppdev.dev)) 
		goto fail_unit;

	z8530_describe(dev, "I/O", iobase);
	dev->active=1;
	return b;

fail_unit:
	unregister_netdev(b->dev[0]->pppdev.dev);
	
dmafail2:
	free_dma(dev->chanA.rxdma);
dmafail:
	free_dma(dev->chanA.txdma);
fail:
	free_irq(irq, dev);
fail1_1:
	free_netdev(b->dev[1]->pppdev.dev);
fail1_0:
	free_netdev(b->dev[0]->pppdev.dev);
fail2:
	kfree(b);
fail3:
	release_region(iobase,8);
	return NULL;
}

static void __exit slvl_shutdown(struct slvl_board *b)
{
	int u;

	z8530_shutdown(&b->board);
	
	for(u=0; u<2; u++)
	{
		struct net_device *d = b->dev[u]->pppdev.dev;
		unregister_netdev(d);
		free_netdev(d);
	}
	
	free_irq(b->board.irq, &b->board);
	free_dma(b->board.chanA.rxdma);
	free_dma(b->board.chanA.txdma);
	/* DMA off on the card, drop DTR */
	outb(0, b->iobase);
	release_region(b->iobase, 8);
	kfree(b);
}


static int io=0x238;
static int txdma=1;
static int rxdma=3;
static int irq=5;
static int slow=0;

module_param(io, int, 0);
MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
module_param(txdma, int, 0);
MODULE_PARM_DESC(txdma, "Transmit DMA channel");
module_param(rxdma, int, 0);
MODULE_PARM_DESC(rxdma, "Receive DMA channel");
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
module_param(slow, bool, 0);
MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");

MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");

static struct slvl_board *slvl_unit;

static int __init slvl_init_module(void)
{
#ifdef MODULE
	printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n");
	printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
#endif
	slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);

	return slvl_unit ? 0 : -ENODEV;
}

static void __exit slvl_cleanup_module(void)
{
	if(slvl_unit)
		slvl_shutdown(slvl_unit);
}

module_init(slvl_init_module);
module_exit(slvl_cleanup_module);