Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / drivers / net / wan / sealevel.c
1 /*
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
26 #include <asm/irq.h>
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 pppdev;
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 - 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);
64         skb_reset_mac_header(skb);
65         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  
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         return 0;
125 }
126
127 static 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
160 static 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
167 static 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  
180 static 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
186 static 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
195 static 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
205 static 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
212 static void sealevel_detach(struct net_device *dev)
213 {
214         sppp_detach(dev);
215 }
216                 
217 static 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
232 static 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  
257 static __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    
325         if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "SeaLevel", dev)<0)
326         {
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
386 fail_unit:
387         unregister_netdev(b->dev[0]->pppdev.dev);
388         
389 dmafail2:
390         free_dma(dev->chanA.rxdma);
391 dmafail:
392         free_dma(dev->chanA.txdma);
393 fail:
394         free_irq(irq, dev);
395 fail1_1:
396         free_netdev(b->dev[1]->pppdev.dev);
397 fail1_0:
398         free_netdev(b->dev[0]->pppdev.dev);
399 fail2:
400         kfree(b);
401 fail3:
402         release_region(iobase,8);
403         return NULL;
404 }
405
406 static 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
429 static int io=0x238;
430 static int txdma=1;
431 static int rxdma=3;
432 static int irq=5;
433 static int slow=0;
434
435 module_param(io, int, 0);
436 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
437 module_param(txdma, int, 0);
438 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
439 module_param(rxdma, int, 0);
440 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
441 module_param(irq, int, 0);
442 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
443 module_param(slow, bool, 0);
444 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
445
446 MODULE_AUTHOR("Alan Cox");
447 MODULE_LICENSE("GPL");
448 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
449
450 static struct slvl_board *slvl_unit;
451
452 static 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
463 static void __exit slvl_cleanup_module(void)
464 {
465         if(slvl_unit)
466                 slvl_shutdown(slvl_unit);
467 }
468
469 module_init(slvl_init_module);
470 module_exit(slvl_cleanup_module);