File: /usr/src/linux/drivers/net/wan/sealevel.c
1 #define LINUX_21
2
3 /*
4 * Sealevel Systems 4021 driver.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * (c) Copyright 1999 Building Number Three Ltd
12 * (c) Copyright 2001 Alan Cox.
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/net.h>
20 #include <linux/skbuff.h>
21 #include <linux/netdevice.h>
22 #include <linux/if_arp.h>
23 #include <linux/delay.h>
24 #include <linux/ioport.h>
25 #include <net/arp.h>
26
27 #include <asm/io.h>
28 #include <asm/dma.h>
29 #include <asm/byteorder.h>
30 #include <net/syncppp.h>
31 #include "z85230.h"
32
33
34 struct slvl_device
35 {
36 void *if_ptr; /* General purpose pointer (used by SPPP) */
37 struct z8530_channel *chan;
38 struct ppp_device netdev;
39 int channel;
40 };
41
42
43 struct slvl_board
44 {
45 struct slvl_device dev[2];
46 struct z8530_dev board;
47 int iobase;
48 };
49
50 /*
51 * Network driver support routines
52 */
53
54 /*
55 * Frame receive. Simple for our card as we do sync ppp and there
56 * is no funny garbage involved
57 */
58
59 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
60 {
61 /* Drop the CRC - its not a good idea to try and negotiate it ;) */
62 skb_trim(skb, skb->len-2);
63 skb->protocol=htons(ETH_P_WAN_PPP);
64 skb->mac.raw=skb->data;
65 skb->dev=c->netdevice;
66 /*
67 * Send it to the PPP layer. We dont have time to process
68 * it right now.
69 */
70 netif_rx(skb);
71 c->netdevice->last_rx = jiffies;
72 }
73
74 /*
75 * We've been placed in the UP state
76 */
77
78 static int sealevel_open(struct net_device *d)
79 {
80 struct slvl_device *slvl=d->priv;
81 int err = -1;
82 int unit = slvl->channel;
83
84 /*
85 * Link layer up.
86 */
87
88 switch(unit)
89 {
90 case 0:
91 err=z8530_sync_dma_open(d, slvl->chan);
92 break;
93 case 1:
94 err=z8530_sync_open(d, slvl->chan);
95 break;
96 }
97
98 if(err)
99 return err;
100 /*
101 * Begin PPP
102 */
103 err=sppp_open(d);
104 if(err)
105 {
106 switch(unit)
107 {
108 case 0:
109 z8530_sync_dma_close(d, slvl->chan);
110 break;
111 case 1:
112 z8530_sync_close(d, slvl->chan);
113 break;
114 }
115 return err;
116 }
117
118 slvl->chan->rx_function=sealevel_input;
119
120 /*
121 * Go go go
122 */
123 netif_start_queue(d);
124 MOD_INC_USE_COUNT;
125 return 0;
126 }
127
128 static int sealevel_close(struct net_device *d)
129 {
130 struct slvl_device *slvl=d->priv;
131 int unit = slvl->channel;
132
133 /*
134 * Discard new frames
135 */
136
137 slvl->chan->rx_function=z8530_null_rx;
138
139 /*
140 * PPP off
141 */
142 sppp_close(d);
143 /*
144 * Link layer down
145 */
146
147 netif_stop_queue(d);
148
149 switch(unit)
150 {
151 case 0:
152 z8530_sync_dma_close(d, slvl->chan);
153 break;
154 case 1:
155 z8530_sync_close(d, slvl->chan);
156 break;
157 }
158 MOD_DEC_USE_COUNT;
159 return 0;
160 }
161
162 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
163 {
164 /* struct slvl_device *slvl=d->priv;
165 z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
166 return sppp_do_ioctl(d, ifr,cmd);
167 }
168
169 static struct net_device_stats *sealevel_get_stats(struct net_device *d)
170 {
171 struct slvl_device *slvl=d->priv;
172 if(slvl)
173 return z8530_get_stats(slvl->chan);
174 else
175 return NULL;
176 }
177
178 /*
179 * Passed PPP frames, fire them downwind.
180 */
181
182 static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
183 {
184 struct slvl_device *slvl=d->priv;
185 return z8530_queue_xmit(slvl->chan, skb);
186 }
187
188 #ifdef LINUX_21
189 static int sealevel_neigh_setup(struct neighbour *n)
190 {
191 if (n->nud_state == NUD_NONE) {
192 n->ops = &arp_broken_ops;
193 n->output = n->ops->output;
194 }
195 return 0;
196 }
197
198 static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
199 {
200 if (p->tbl->family == AF_INET) {
201 p->neigh_setup = sealevel_neigh_setup;
202 p->ucast_probes = 0;
203 p->mcast_probes = 0;
204 }
205 return 0;
206 }
207
208 #else
209
210 static int return_0(struct net_device *d)
211 {
212 return 0;
213 }
214
215 #endif
216
217 /*
218 * Description block for a Comtrol Hostess SV11 card
219 */
220
221 static struct slvl_board *slvl_init(int iobase, int irq, int txdma, int rxdma, int slow)
222 {
223 struct z8530_dev *dev;
224 struct slvl_device *sv;
225 struct slvl_board *b;
226
227 unsigned long flags;
228 int u;
229
230 /*
231 * Get the needed I/O space
232 */
233
234 if(check_region(iobase, 8))
235 {
236 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
237 return NULL;
238 }
239 request_region(iobase, 8, "Sealevel 4021");
240
241 b=(struct slvl_board *)kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
242 if(!b)
243 goto fail3;
244
245 memset(b, 0, sizeof(*sv));
246
247 b->dev[0].chan = &b->board.chanA;
248 b->dev[0].if_ptr = &b->dev[0].netdev;
249 b->dev[0].netdev.dev=(struct net_device *)
250 kmalloc(sizeof(struct net_device), GFP_KERNEL);
251 if(!b->dev[0].netdev.dev)
252 goto fail2;
253
254 b->dev[1].chan = &b->board.chanB;
255 b->dev[1].if_ptr = &b->dev[1].netdev;
256 b->dev[1].netdev.dev=(struct net_device *)
257 kmalloc(sizeof(struct net_device), GFP_KERNEL);
258 if(!b->dev[1].netdev.dev)
259 goto fail1_0;
260
261 dev=&b->board;
262
263 /*
264 * Stuff in the I/O addressing
265 */
266
267 dev->active = 0;
268
269 b->iobase = iobase;
270
271 /*
272 * Select 8530 delays for the old board
273 */
274
275 if(slow)
276 iobase |= Z8530_PORT_SLEEP;
277
278 dev->chanA.ctrlio=iobase+1;
279 dev->chanA.dataio=iobase;
280 dev->chanB.ctrlio=iobase+3;
281 dev->chanB.dataio=iobase+2;
282
283 dev->chanA.irqs=&z8530_nop;
284 dev->chanB.irqs=&z8530_nop;
285
286 /*
287 * Assert DTR enable DMA
288 */
289
290 outb(3|(1<<7), b->iobase+4);
291
292
293 /* We want a fast IRQ for this device. Actually we'd like an even faster
294 IRQ ;) - This is one driver RtLinux is made for */
295
296 if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "SeaLevel", dev)<0)
297 {
298 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
299 goto fail1_1;
300 }
301
302 dev->irq=irq;
303 dev->chanA.private=&b->dev[0];
304 dev->chanB.private=&b->dev[1];
305 dev->chanA.netdevice=b->dev[0].netdev.dev;
306 dev->chanB.netdevice=b->dev[1].netdev.dev;
307 dev->chanA.dev=dev;
308 dev->chanB.dev=dev;
309
310 dev->chanA.txdma=3;
311 dev->chanA.rxdma=1;
312 if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
313 goto fail;
314
315 if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
316 goto dmafail;
317
318 save_flags(flags);
319 cli();
320
321 /*
322 * Begin normal initialise
323 */
324
325 if(z8530_init(dev)!=0)
326 {
327 printk(KERN_ERR "Z8530 series device not found.\n");
328 restore_flags(flags);
329 goto dmafail2;
330 }
331 if(dev->type==Z85C30)
332 {
333 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
334 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
335 }
336 else
337 {
338 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
339 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
340 }
341
342 /*
343 * Now we can take the IRQ
344 */
345
346 restore_flags(flags);
347
348 for(u=0; u<2; u++)
349 {
350 sv=&b->dev[u];
351 sv->channel = u;
352
353 if(dev_alloc_name(sv->chan->netdevice,"hdlc%d")>=0)
354 {
355 struct net_device *d=sv->chan->netdevice;
356
357 /*
358 * Initialise the PPP components
359 */
360 sppp_attach(&sv->netdev);
361
362 /*
363 * Local fields
364 */
365
366 d->base_addr = iobase;
367 d->irq = irq;
368 d->priv = sv;
369 d->init = NULL;
370
371 d->open = sealevel_open;
372 d->stop = sealevel_close;
373 d->hard_start_xmit = sealevel_queue_xmit;
374 d->get_stats = sealevel_get_stats;
375 d->set_multicast_list = NULL;
376 d->do_ioctl = sealevel_ioctl;
377 #ifdef LINUX_21
378 d->neigh_setup = sealevel_neigh_setup_dev;
379 #else
380 d->init = return_0;
381 #endif
382 d->set_mac_address = NULL;
383
384 if(register_netdev(d)==-1)
385 {
386 printk(KERN_ERR "%s: unable to register device.\n",
387 d->name);
388 goto fail_unit;
389 }
390
391 break;
392 }
393 }
394 z8530_describe(dev, "I/O", iobase);
395 dev->active=1;
396 return b;
397
398 fail_unit:
399 if(u==1)
400 unregister_netdev(b->dev[0].chan->netdevice);
401
402 dmafail2:
403 free_dma(dev->chanA.rxdma);
404 dmafail:
405 free_dma(dev->chanA.txdma);
406 fail:
407 free_irq(irq, dev);
408 fail1_1:
409 kfree(b->dev[1].netdev.dev);
410 fail1_0:
411 kfree(b->dev[0].netdev.dev);
412 fail2:
413 kfree(b);
414 fail3:
415 release_region(iobase,8);
416 return NULL;
417 }
418
419 static void slvl_shutdown(struct slvl_board *b)
420 {
421 int u;
422
423 z8530_shutdown(&b->board);
424
425 for(u=0; u<2; u++)
426 {
427 sppp_detach(b->dev[u].netdev.dev);
428 unregister_netdev(b->dev[u].netdev.dev);
429 }
430
431 free_irq(b->board.irq, &b->board);
432 free_dma(b->board.chanA.rxdma);
433 free_dma(b->board.chanA.txdma);
434 /* DMA off on the card, drop DTR */
435 outb(0, b->iobase);
436 release_region(b->iobase, 8);
437 }
438
439 #ifdef MODULE
440
441 static int io=0x238;
442 static int txdma=1;
443 static int rxdma=3;
444 static int irq=5;
445 static int slow=0;
446
447 #ifdef LINUX_21
448 MODULE_PARM(io,"i");
449 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
450 MODULE_PARM(txdma,"i");
451 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
452 MODULE_PARM(rxdma,"i");
453 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
454 MODULE_PARM(irq,"i");
455 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
456 MODULE_PARM(slow,"i");
457 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
458
459 MODULE_AUTHOR("Alan Cox");
460 MODULE_LICENSE("GPL");
461 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
462 #endif
463
464 static struct slvl_board *slvl_unit;
465
466 int init_module(void)
467 {
468 printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.01.\n");
469 printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
470 if((slvl_unit=slvl_init(io,irq, txdma, rxdma, slow))==NULL)
471 return -ENODEV;
472 return 0;
473 }
474
475 void cleanup_module(void)
476 {
477 if(slvl_unit)
478 slvl_shutdown(slvl_unit);
479 }
480
481 #endif
482
483