aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wan/hostess_sv11.c
blob: f3065d3473fdc711abc928ef13841c5e754e9ca4 (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
/*
 *	Comtrol SV11 card driver
 *
 *	This is a slightly odd Z85230 synchronous driver. All you need to
 *	know basically is
 *
 *	Its a genuine Z85230
 *
 *	It supports DMA using two DMA channels in SYNC mode. The driver doesn't
 *	use these facilities
 *	
 *	The control port is at io+1, the data at io+3 and turning off the DMA
 *	is done by writing 0 to io+4
 *
 *	The hardware does the bus handling to avoid the need for delays between
 *	touching control registers.
 *
 *	Port B isnt wired (why - beats me)
 */

#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 <net/arp.h>

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

static int dma;

struct sv11_device
{
	void *if_ptr;	/* General purpose pointer (used by SPPP) */
	struct z8530_dev sync;
	struct ppp_device netdev;
};

/*
 *	Network driver support routines
 */

/*
 *	Frame receive. Simple for our card as we do sync ppp and there
 *	is no funny garbage involved
 */
 
static void hostess_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=__constant_htons(ETH_P_WAN_PPP);
	skb_reset_mac_header(skb);
	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 hostess_open(struct net_device *d)
{
	struct sv11_device *sv11=d->ml_priv;
	int err = -1;
	
	/*
	 *	Link layer up
	 */
	switch(dma)
	{
		case 0:
			err=z8530_sync_open(d, &sv11->sync.chanA);
			break;
		case 1:
			err=z8530_sync_dma_open(d, &sv11->sync.chanA);
			break;
		case 2:
			err=z8530_sync_txdma_open(d, &sv11->sync.chanA);
			break;
	}
	
	if(err)
		return err;
	/*
	 *	Begin PPP
	 */
	err=sppp_open(d);
	if(err)
	{
		switch(dma)
		{
			case 0:
				z8530_sync_close(d, &sv11->sync.chanA);
				break;
			case 1:
				z8530_sync_dma_close(d, &sv11->sync.chanA);
				break;
			case 2:
				z8530_sync_txdma_close(d, &sv11->sync.chanA);
				break;
		}				
		return err;
	}
	sv11->sync.chanA.rx_function=hostess_input;
	
	/*
	 *	Go go go
	 */

	netif_start_queue(d);
	return 0;
}

static int hostess_close(struct net_device *d)
{
	struct sv11_device *sv11=d->ml_priv;
	/*
	 *	Discard new frames
	 */
	sv11->sync.chanA.rx_function=z8530_null_rx;
	/*
	 *	PPP off
	 */
	sppp_close(d);
	/*
	 *	Link layer down
	 */
	netif_stop_queue(d);
		
	switch(dma)
	{
		case 0:
			z8530_sync_close(d, &sv11->sync.chanA);
			break;
		case 1:
			z8530_sync_dma_close(d, &sv11->sync.chanA);
			break;
		case 2:
			z8530_sync_txdma_close(d, &sv11->sync.chanA);
			break;
	}
	return 0;
}

static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
{
	/* struct sv11_device *sv11=d->ml_priv;
	   z8530_ioctl(d,&sv11->sync.chanA,ifr,cmd) */
	return sppp_do_ioctl(d, ifr,cmd);
}

static struct net_device_stats *hostess_get_stats(struct net_device *d)
{
	struct sv11_device *sv11=d->ml_priv;
	if(sv11)
		return z8530_get_stats(&sv11->sync.chanA);
	else
		return NULL;
}

/*
 *	Passed PPP frames, fire them downwind.
 */
 
static int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
{
	struct sv11_device *sv11=d->ml_priv;
	return z8530_queue_xmit(&sv11->sync.chanA, skb);
}

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

static void sv11_setup(struct net_device *dev)
{	
	dev->open = hostess_open;
	dev->stop = hostess_close;
	dev->hard_start_xmit = hostess_queue_xmit;
	dev->get_stats = hostess_get_stats;
	dev->do_ioctl = hostess_ioctl;
	dev->neigh_setup = hostess_neigh_setup_dev;
}

/*
 *	Description block for a Comtrol Hostess SV11 card
 */
 
static struct sv11_device *sv11_init(int iobase, int irq)
{
	struct z8530_dev *dev;
	struct sv11_device *sv;
	
	/*
	 *	Get the needed I/O space
	 */
	 
	if(!request_region(iobase, 8, "Comtrol SV11"))
	{	
		printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n", iobase);
		return NULL;
	}
	
	sv = kzalloc(sizeof(struct sv11_device), GFP_KERNEL);
	if(!sv)
		goto fail3;
			
	sv->if_ptr=&sv->netdev;
	
	sv->netdev.dev = alloc_netdev(0, "hdlc%d", sv11_setup);
	if(!sv->netdev.dev)
		goto fail2;

	dev=&sv->sync;
	
	/*
	 *	Stuff in the I/O addressing
	 */
	 
	dev->active = 0;
	
	dev->chanA.ctrlio=iobase+1;
	dev->chanA.dataio=iobase+3;
	dev->chanB.ctrlio=-1;
	dev->chanB.dataio=-1;
	dev->chanA.irqs=&z8530_nop;
	dev->chanB.irqs=&z8530_nop;
	
	outb(0, iobase+4);		/* DMA off */
	
	/* 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, IRQF_DISABLED, "Hostess SV11", dev)<0)
	{
		printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
		goto fail1;
	}
	
	dev->irq=irq;
	dev->chanA.private=sv;
	dev->chanA.netdevice=sv->netdev.dev;
	dev->chanA.dev=dev;
	dev->chanB.dev=dev;
	
	if(dma)
	{
		/*
		 *	You can have DMA off or 1 and 3 thats the lot
		 *	on the Comtrol.
		 */
		dev->chanA.txdma=3;
		dev->chanA.rxdma=1;
		outb(0x03|0x08, iobase+4);		/* DMA on */
		if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
			goto fail;
			
		if(dma==1)
		{
			if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
				goto dmafail;
		}
	}

	/* Kill our private IRQ line the hostess can end up chattering
	   until the configuration is set */
	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;
	}
	z8530_channel_load(&dev->chanB, z8530_dead_port);
	if(dev->type==Z85C30)
		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
	else
		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
	
	enable_irq(irq);
	

	/*
	 *	Now we can take the IRQ
	 */
	if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
	{
		struct net_device *d=dev->chanA.netdevice;

		/* 
		 *	Initialise the PPP components
		 */
		d->ml_priv = sv;
		sppp_attach(&sv->netdev);
		
		/*
		 *	Local fields
		 */	
		
		d->base_addr = iobase;
		d->irq = irq;
		
		if(register_netdev(d))
		{
			printk(KERN_ERR "%s: unable to register device.\n",
				d->name);
			sppp_detach(d);
			goto dmafail2;
		}

		z8530_describe(dev, "I/O", iobase);
		dev->active=1;
		return sv;	
	}
dmafail2:
	if(dma==1)
		free_dma(dev->chanA.rxdma);
dmafail:
	if(dma)
		free_dma(dev->chanA.txdma);
fail:
	free_irq(irq, dev);
fail1:
	free_netdev(sv->netdev.dev);
fail2:
	kfree(sv);
fail3:
	release_region(iobase,8);
	return NULL;
}

static void sv11_shutdown(struct sv11_device *dev)
{
	sppp_detach(dev->netdev.dev);
	unregister_netdev(dev->netdev.dev);
	z8530_shutdown(&dev->sync);
	free_irq(dev->sync.irq, dev);
	if(dma)
	{
		if(dma==1)
			free_dma(dev->sync.chanA.rxdma);
		free_dma(dev->sync.chanA.txdma);
	}
	release_region(dev->sync.chanA.ctrlio-1, 8);
	free_netdev(dev->netdev.dev);
	kfree(dev);
}

#ifdef MODULE

static int io=0x200;
static int irq=9;

module_param(io, int, 0);
MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
module_param(dma, int, 0);
MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");

MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");

static struct sv11_device *sv11_unit;

int init_module(void)
{
	printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.03.\n");
	printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n");	
	if((sv11_unit=sv11_init(io,irq))==NULL)
		return -ENODEV;
	return 0;
}

void cleanup_module(void)
{
	if(sv11_unit)
		sv11_shutdown(sv11_unit);
}

#endif