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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Sealevel Systems 4021 driver.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * (c) Copyright 1999, 2001 Alan Cox
10 * (c) Copyright 2001 Red Hat Inc.
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/mm.h>
17#include <linux/net.h>
18#include <linux/skbuff.h>
19#include <linux/netdevice.h>
20#include <linux/if_arp.h>
21#include <linux/delay.h>
22#include <linux/ioport.h>
23#include <linux/init.h>
24#include <net/arp.h>
25
Al Viro82729972005-12-06 05:53:04 -050026#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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
34struct slvl_device
35{
36 void *if_ptr; /* General purpose pointer (used by SPPP) */
37 struct z8530_channel *chan;
38 struct ppp_device pppdev;
39 int channel;
40};
41
42
43struct 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
59static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
60{
61 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
62 skb_trim(skb, skb->len-2);
63 skb->protocol=htons(ETH_P_WAN_PPP);
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -070064 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 skb->dev=c->netdevice;
66 /*
67 * Send it to the PPP layer. We don't 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
78static 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 return 0;
125}
126
127static int sealevel_close(struct net_device *d)
128{
129 struct slvl_device *slvl=d->priv;
130 int unit = slvl->channel;
131
132 /*
133 * Discard new frames
134 */
135
136 slvl->chan->rx_function=z8530_null_rx;
137
138 /*
139 * PPP off
140 */
141 sppp_close(d);
142 /*
143 * Link layer down
144 */
145
146 netif_stop_queue(d);
147
148 switch(unit)
149 {
150 case 0:
151 z8530_sync_dma_close(d, slvl->chan);
152 break;
153 case 1:
154 z8530_sync_close(d, slvl->chan);
155 break;
156 }
157 return 0;
158}
159
160static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
161{
162 /* struct slvl_device *slvl=d->priv;
163 z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
164 return sppp_do_ioctl(d, ifr,cmd);
165}
166
167static struct net_device_stats *sealevel_get_stats(struct net_device *d)
168{
169 struct slvl_device *slvl=d->priv;
170 if(slvl)
171 return z8530_get_stats(slvl->chan);
172 else
173 return NULL;
174}
175
176/*
177 * Passed PPP frames, fire them downwind.
178 */
179
180static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d)
181{
182 struct slvl_device *slvl=d->priv;
183 return z8530_queue_xmit(slvl->chan, skb);
184}
185
186static int sealevel_neigh_setup(struct neighbour *n)
187{
188 if (n->nud_state == NUD_NONE) {
189 n->ops = &arp_broken_ops;
190 n->output = n->ops->output;
191 }
192 return 0;
193}
194
195static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
196{
197 if (p->tbl->family == AF_INET) {
198 p->neigh_setup = sealevel_neigh_setup;
199 p->ucast_probes = 0;
200 p->mcast_probes = 0;
201 }
202 return 0;
203}
204
205static int sealevel_attach(struct net_device *dev)
206{
207 struct slvl_device *sv = dev->priv;
208 sppp_attach(&sv->pppdev);
209 return 0;
210}
211
212static void sealevel_detach(struct net_device *dev)
213{
214 sppp_detach(dev);
215}
216
217static void slvl_setup(struct net_device *d)
218{
219 d->open = sealevel_open;
220 d->stop = sealevel_close;
221 d->init = sealevel_attach;
222 d->uninit = sealevel_detach;
223 d->hard_start_xmit = sealevel_queue_xmit;
224 d->get_stats = sealevel_get_stats;
225 d->set_multicast_list = NULL;
226 d->do_ioctl = sealevel_ioctl;
227 d->neigh_setup = sealevel_neigh_setup_dev;
228 d->set_mac_address = NULL;
229
230}
231
232static inline struct slvl_device *slvl_alloc(int iobase, int irq)
233{
234 struct net_device *d;
235 struct slvl_device *sv;
236
237 d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d",
238 slvl_setup);
239
240 if (!d)
241 return NULL;
242
243 sv = d->priv;
244 sv->if_ptr = &sv->pppdev;
245 sv->pppdev.dev = d;
246 d->base_addr = iobase;
247 d->irq = irq;
248
249 return sv;
250}
251
252
253/*
254 * Allocate and setup Sealevel board.
255 */
256
257static __init struct slvl_board *slvl_init(int iobase, int irq,
258 int txdma, int rxdma, int slow)
259{
260 struct z8530_dev *dev;
261 struct slvl_board *b;
262
263 /*
264 * Get the needed I/O space
265 */
266
267 if(!request_region(iobase, 8, "Sealevel 4021"))
268 {
269 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase);
270 return NULL;
271 }
272
273 b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL);
274 if(!b)
275 goto fail3;
276
277 memset(b, 0, sizeof(*b));
278 if (!(b->dev[0]= slvl_alloc(iobase, irq)))
279 goto fail2;
280
281 b->dev[0]->chan = &b->board.chanA;
282 b->dev[0]->channel = 0;
283
284 if (!(b->dev[1] = slvl_alloc(iobase, irq)))
285 goto fail1_0;
286
287 b->dev[1]->chan = &b->board.chanB;
288 b->dev[1]->channel = 1;
289
290 dev = &b->board;
291
292 /*
293 * Stuff in the I/O addressing
294 */
295
296 dev->active = 0;
297
298 b->iobase = iobase;
299
300 /*
301 * Select 8530 delays for the old board
302 */
303
304 if(slow)
305 iobase |= Z8530_PORT_SLEEP;
306
307 dev->chanA.ctrlio=iobase+1;
308 dev->chanA.dataio=iobase;
309 dev->chanB.ctrlio=iobase+3;
310 dev->chanB.dataio=iobase+2;
311
312 dev->chanA.irqs=&z8530_nop;
313 dev->chanB.irqs=&z8530_nop;
314
315 /*
316 * Assert DTR enable DMA
317 */
318
319 outb(3|(1<<7), b->iobase+4);
320
321
322 /* We want a fast IRQ for this device. Actually we'd like an even faster
323 IRQ ;) - This is one driver RtLinux is made for */
324
Thomas Gleixner1fb9df52006-07-01 19:29:39 -0700325 if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "SeaLevel", dev)<0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 {
327 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
328 goto fail1_1;
329 }
330
331 dev->irq=irq;
332 dev->chanA.private=&b->dev[0];
333 dev->chanB.private=&b->dev[1];
334 dev->chanA.netdevice=b->dev[0]->pppdev.dev;
335 dev->chanB.netdevice=b->dev[1]->pppdev.dev;
336 dev->chanA.dev=dev;
337 dev->chanB.dev=dev;
338
339 dev->chanA.txdma=3;
340 dev->chanA.rxdma=1;
341 if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0)
342 goto fail;
343
344 if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0)
345 goto dmafail;
346
347 disable_irq(irq);
348
349 /*
350 * Begin normal initialise
351 */
352
353 if(z8530_init(dev)!=0)
354 {
355 printk(KERN_ERR "Z8530 series device not found.\n");
356 enable_irq(irq);
357 goto dmafail2;
358 }
359 if(dev->type==Z85C30)
360 {
361 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
362 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
363 }
364 else
365 {
366 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
367 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
368 }
369
370 /*
371 * Now we can take the IRQ
372 */
373
374 enable_irq(irq);
375
376 if (register_netdev(b->dev[0]->pppdev.dev))
377 goto dmafail2;
378
379 if (register_netdev(b->dev[1]->pppdev.dev))
380 goto fail_unit;
381
382 z8530_describe(dev, "I/O", iobase);
383 dev->active=1;
384 return b;
385
386fail_unit:
387 unregister_netdev(b->dev[0]->pppdev.dev);
388
389dmafail2:
390 free_dma(dev->chanA.rxdma);
391dmafail:
392 free_dma(dev->chanA.txdma);
393fail:
394 free_irq(irq, dev);
395fail1_1:
396 free_netdev(b->dev[1]->pppdev.dev);
397fail1_0:
398 free_netdev(b->dev[0]->pppdev.dev);
399fail2:
400 kfree(b);
401fail3:
402 release_region(iobase,8);
403 return NULL;
404}
405
406static void __exit slvl_shutdown(struct slvl_board *b)
407{
408 int u;
409
410 z8530_shutdown(&b->board);
411
412 for(u=0; u<2; u++)
413 {
414 struct net_device *d = b->dev[u]->pppdev.dev;
415 unregister_netdev(d);
416 free_netdev(d);
417 }
418
419 free_irq(b->board.irq, &b->board);
420 free_dma(b->board.chanA.rxdma);
421 free_dma(b->board.chanA.txdma);
422 /* DMA off on the card, drop DTR */
423 outb(0, b->iobase);
424 release_region(b->iobase, 8);
425 kfree(b);
426}
427
428
429static int io=0x238;
430static int txdma=1;
431static int rxdma=3;
432static int irq=5;
433static int slow=0;
434
435module_param(io, int, 0);
436MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
437module_param(txdma, int, 0);
438MODULE_PARM_DESC(txdma, "Transmit DMA channel");
439module_param(rxdma, int, 0);
440MODULE_PARM_DESC(rxdma, "Receive DMA channel");
441module_param(irq, int, 0);
442MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
443module_param(slow, bool, 0);
444MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
445
446MODULE_AUTHOR("Alan Cox");
447MODULE_LICENSE("GPL");
448MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
449
450static struct slvl_board *slvl_unit;
451
452static int __init slvl_init_module(void)
453{
454#ifdef MODULE
455 printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n");
456 printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n");
457#endif
458 slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
459
460 return slvl_unit ? 0 : -ENODEV;
461}
462
463static void __exit slvl_cleanup_module(void)
464{
465 if(slvl_unit)
466 slvl_shutdown(slvl_unit);
467}
468
469module_init(slvl_init_module);
470module_exit(slvl_cleanup_module);