Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-mmc
[linux-2.6] / drivers / net / wan / hostess_sv11.c
1 /*
2  *      Comtrol SV11 card driver
3  *
4  *      This is a slightly odd Z85230 synchronous driver. All you need to
5  *      know basically is
6  *
7  *      Its a genuine Z85230
8  *
9  *      It supports DMA using two DMA channels in SYNC mode. The driver doesn't
10  *      use these facilities
11  *      
12  *      The control port is at io+1, the data at io+3 and turning off the DMA
13  *      is done by writing 0 to io+4
14  *
15  *      The hardware does the bus handling to avoid the need for delays between
16  *      touching control registers.
17  *
18  *      Port B isnt wired (why - beats me)
19  */
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/net.h>
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/if_arp.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <net/arp.h>
31
32 #include <asm/irq.h>
33 #include <asm/io.h>
34 #include <asm/dma.h>
35 #include <asm/byteorder.h>
36 #include <net/syncppp.h>
37 #include "z85230.h"
38
39 static int dma;
40
41 struct sv11_device
42 {
43         void *if_ptr;   /* General purpose pointer (used by SPPP) */
44         struct z8530_dev sync;
45         struct ppp_device netdev;
46 };
47
48 /*
49  *      Network driver support routines
50  */
51
52 /*
53  *      Frame receive. Simple for our card as we do sync ppp and there
54  *      is no funny garbage involved
55  */
56  
57 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
58 {
59         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
60         skb_trim(skb, skb->len-2);
61         skb->protocol=__constant_htons(ETH_P_WAN_PPP);
62         skb->mac.raw=skb->data;
63         skb->dev=c->netdevice;
64         /*
65          *      Send it to the PPP layer. We don't have time to process
66          *      it right now.
67          */
68         netif_rx(skb);
69         c->netdevice->last_rx = jiffies;
70 }
71  
72 /*
73  *      We've been placed in the UP state
74  */ 
75  
76 static int hostess_open(struct net_device *d)
77 {
78         struct sv11_device *sv11=d->priv;
79         int err = -1;
80         
81         /*
82          *      Link layer up
83          */
84         switch(dma)
85         {
86                 case 0:
87                         err=z8530_sync_open(d, &sv11->sync.chanA);
88                         break;
89                 case 1:
90                         err=z8530_sync_dma_open(d, &sv11->sync.chanA);
91                         break;
92                 case 2:
93                         err=z8530_sync_txdma_open(d, &sv11->sync.chanA);
94                         break;
95         }
96         
97         if(err)
98                 return err;
99         /*
100          *      Begin PPP
101          */
102         err=sppp_open(d);
103         if(err)
104         {
105                 switch(dma)
106                 {
107                         case 0:
108                                 z8530_sync_close(d, &sv11->sync.chanA);
109                                 break;
110                         case 1:
111                                 z8530_sync_dma_close(d, &sv11->sync.chanA);
112                                 break;
113                         case 2:
114                                 z8530_sync_txdma_close(d, &sv11->sync.chanA);
115                                 break;
116                 }                               
117                 return err;
118         }
119         sv11->sync.chanA.rx_function=hostess_input;
120         
121         /*
122          *      Go go go
123          */
124
125         netif_start_queue(d);
126         return 0;
127 }
128
129 static int hostess_close(struct net_device *d)
130 {
131         struct sv11_device *sv11=d->priv;
132         /*
133          *      Discard new frames
134          */
135         sv11->sync.chanA.rx_function=z8530_null_rx;
136         /*
137          *      PPP off
138          */
139         sppp_close(d);
140         /*
141          *      Link layer down
142          */
143         netif_stop_queue(d);
144                 
145         switch(dma)
146         {
147                 case 0:
148                         z8530_sync_close(d, &sv11->sync.chanA);
149                         break;
150                 case 1:
151                         z8530_sync_dma_close(d, &sv11->sync.chanA);
152                         break;
153                 case 2:
154                         z8530_sync_txdma_close(d, &sv11->sync.chanA);
155                         break;
156         }
157         return 0;
158 }
159
160 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
161 {
162         /* struct sv11_device *sv11=d->priv;
163            z8530_ioctl(d,&sv11->sync.chanA,ifr,cmd) */
164         return sppp_do_ioctl(d, ifr,cmd);
165 }
166
167 static struct net_device_stats *hostess_get_stats(struct net_device *d)
168 {
169         struct sv11_device *sv11=d->priv;
170         if(sv11)
171                 return z8530_get_stats(&sv11->sync.chanA);
172         else
173                 return NULL;
174 }
175
176 /*
177  *      Passed PPP frames, fire them downwind.
178  */
179  
180 static int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
181 {
182         struct sv11_device *sv11=d->priv;
183         return z8530_queue_xmit(&sv11->sync.chanA, skb);
184 }
185
186 static int hostess_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 hostess_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
196 {
197         if (p->tbl->family == AF_INET) {
198                 p->neigh_setup = hostess_neigh_setup;
199                 p->ucast_probes = 0;
200                 p->mcast_probes = 0;
201         }
202         return 0;
203 }
204
205 static void sv11_setup(struct net_device *dev)
206 {       
207         dev->open = hostess_open;
208         dev->stop = hostess_close;
209         dev->hard_start_xmit = hostess_queue_xmit;
210         dev->get_stats = hostess_get_stats;
211         dev->do_ioctl = hostess_ioctl;
212         dev->neigh_setup = hostess_neigh_setup_dev;
213 }
214
215 /*
216  *      Description block for a Comtrol Hostess SV11 card
217  */
218  
219 static struct sv11_device *sv11_init(int iobase, int irq)
220 {
221         struct z8530_dev *dev;
222         struct sv11_device *sv;
223         
224         /*
225          *      Get the needed I/O space
226          */
227          
228         if(!request_region(iobase, 8, "Comtrol SV11"))
229         {       
230                 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n", iobase);
231                 return NULL;
232         }
233         
234         sv=(struct sv11_device *)kmalloc(sizeof(struct sv11_device), GFP_KERNEL);
235         if(!sv)
236                 goto fail3;
237                         
238         memset(sv, 0, sizeof(*sv));
239         sv->if_ptr=&sv->netdev;
240         
241         sv->netdev.dev = alloc_netdev(0, "hdlc%d", sv11_setup);
242         if(!sv->netdev.dev)
243                 goto fail2;
244
245         SET_MODULE_OWNER(sv->netdev.dev);
246
247         dev=&sv->sync;
248         
249         /*
250          *      Stuff in the I/O addressing
251          */
252          
253         dev->active = 0;
254         
255         dev->chanA.ctrlio=iobase+1;
256         dev->chanA.dataio=iobase+3;
257         dev->chanB.ctrlio=-1;
258         dev->chanB.dataio=-1;
259         dev->chanA.irqs=&z8530_nop;
260         dev->chanB.irqs=&z8530_nop;
261         
262         outb(0, iobase+4);              /* DMA off */
263         
264         /* We want a fast IRQ for this device. Actually we'd like an even faster
265            IRQ ;) - This is one driver RtLinux is made for */
266            
267         if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "Hostess SV11", dev)<0)
268         {
269                 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
270                 goto fail1;
271         }
272         
273         dev->irq=irq;
274         dev->chanA.private=sv;
275         dev->chanA.netdevice=sv->netdev.dev;
276         dev->chanA.dev=dev;
277         dev->chanB.dev=dev;
278         
279         if(dma)
280         {
281                 /*
282                  *      You can have DMA off or 1 and 3 thats the lot
283                  *      on the Comtrol.
284                  */
285                 dev->chanA.txdma=3;
286                 dev->chanA.rxdma=1;
287                 outb(0x03|0x08, iobase+4);              /* DMA on */
288                 if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
289                         goto fail;
290                         
291                 if(dma==1)
292                 {
293                         if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
294                                 goto dmafail;
295                 }
296         }
297
298         /* Kill our private IRQ line the hostess can end up chattering
299            until the configuration is set */
300         disable_irq(irq);
301                 
302         /*
303          *      Begin normal initialise
304          */
305          
306         if(z8530_init(dev)!=0)
307         {
308                 printk(KERN_ERR "Z8530 series device not found.\n");
309                 enable_irq(irq);
310                 goto dmafail2;
311         }
312         z8530_channel_load(&dev->chanB, z8530_dead_port);
313         if(dev->type==Z85C30)
314                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
315         else
316                 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
317         
318         enable_irq(irq);
319         
320
321         /*
322          *      Now we can take the IRQ
323          */
324         if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
325         {
326                 struct net_device *d=dev->chanA.netdevice;
327
328                 /* 
329                  *      Initialise the PPP components
330                  */
331                 sppp_attach(&sv->netdev);
332                 
333                 /*
334                  *      Local fields
335                  */     
336                 
337                 d->base_addr = iobase;
338                 d->irq = irq;
339                 d->priv = sv;
340                 
341                 if(register_netdev(d))
342                 {
343                         printk(KERN_ERR "%s: unable to register device.\n",
344                                 d->name);
345                         sppp_detach(d);
346                         goto dmafail2;
347                 }
348
349                 z8530_describe(dev, "I/O", iobase);
350                 dev->active=1;
351                 return sv;      
352         }
353 dmafail2:
354         if(dma==1)
355                 free_dma(dev->chanA.rxdma);
356 dmafail:
357         if(dma)
358                 free_dma(dev->chanA.txdma);
359 fail:
360         free_irq(irq, dev);
361 fail1:
362         free_netdev(sv->netdev.dev);
363 fail2:
364         kfree(sv);
365 fail3:
366         release_region(iobase,8);
367         return NULL;
368 }
369
370 static void sv11_shutdown(struct sv11_device *dev)
371 {
372         sppp_detach(dev->netdev.dev);
373         unregister_netdev(dev->netdev.dev);
374         z8530_shutdown(&dev->sync);
375         free_irq(dev->sync.irq, dev);
376         if(dma)
377         {
378                 if(dma==1)
379                         free_dma(dev->sync.chanA.rxdma);
380                 free_dma(dev->sync.chanA.txdma);
381         }
382         release_region(dev->sync.chanA.ctrlio-1, 8);
383         free_netdev(dev->netdev.dev);
384         kfree(dev);
385 }
386
387 #ifdef MODULE
388
389 static int io=0x200;
390 static int irq=9;
391
392 module_param(io, int, 0);
393 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
394 module_param(dma, int, 0);
395 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
396 module_param(irq, int, 0);
397 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
398
399 MODULE_AUTHOR("Alan Cox");
400 MODULE_LICENSE("GPL");
401 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
402
403 static struct sv11_device *sv11_unit;
404
405 int init_module(void)
406 {
407         printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.03.\n");
408         printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n"); 
409         if((sv11_unit=sv11_init(io,irq))==NULL)
410                 return -ENODEV;
411         return 0;
412 }
413
414 void cleanup_module(void)
415 {
416         if(sv11_unit)
417                 sv11_shutdown(sv11_unit);
418 }
419
420 #endif
421