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/io.h>
33 #include <asm/dma.h>
34 #include <asm/byteorder.h>
35 #include <net/syncppp.h>
36 #include "z85230.h"
37
38 static int dma;
39
40 struct sv11_device
41 {
42 void *if_ptr; /* General purpose pointer (used by SPPP) */
43 struct z8530_dev sync;
44 struct ppp_device netdev;
45 };
46
47 /*
48 * Network driver support routines
49 */
50
51 /*
52 * Frame receive. Simple for our card as we do sync ppp and there
53 * is no funny garbage involved
54 */
55
hostess_input(struct z8530_channel * c,struct sk_buff * skb)56 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
57 {
58 /* Drop the CRC - its not a good idea to try and negotiate it ;) */
59 skb_trim(skb, skb->len-2);
60 skb->protocol=__constant_htons(ETH_P_WAN_PPP);
61 skb->mac.raw=skb->data;
62 skb->dev=c->netdevice;
63 /*
64 * Send it to the PPP layer. We dont have time to process
65 * it right now.
66 */
67 netif_rx(skb);
68 c->netdevice->last_rx = jiffies;
69 }
70
71 /*
72 * We've been placed in the UP state
73 */
74
hostess_open(struct net_device * d)75 static int hostess_open(struct net_device *d)
76 {
77 struct sv11_device *sv11=d->priv;
78 int err = -1;
79
80 /*
81 * Link layer up
82 */
83 switch(dma)
84 {
85 case 0:
86 err=z8530_sync_open(d, &sv11->sync.chanA);
87 break;
88 case 1:
89 err=z8530_sync_dma_open(d, &sv11->sync.chanA);
90 break;
91 case 2:
92 err=z8530_sync_txdma_open(d, &sv11->sync.chanA);
93 break;
94 }
95
96 if(err)
97 return err;
98 /*
99 * Begin PPP
100 */
101 err=sppp_open(d);
102 if(err)
103 {
104 switch(dma)
105 {
106 case 0:
107 z8530_sync_close(d, &sv11->sync.chanA);
108 break;
109 case 1:
110 z8530_sync_dma_close(d, &sv11->sync.chanA);
111 break;
112 case 2:
113 z8530_sync_txdma_close(d, &sv11->sync.chanA);
114 break;
115 }
116 return err;
117 }
118 sv11->sync.chanA.rx_function=hostess_input;
119
120 /*
121 * Go go go
122 */
123
124 netif_start_queue(d);
125 MOD_INC_USE_COUNT;
126 return 0;
127 }
128
hostess_close(struct net_device * d)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 MOD_DEC_USE_COUNT;
158 return 0;
159 }
160
hostess_ioctl(struct net_device * d,struct ifreq * ifr,int cmd)161 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
162 {
163 /* struct sv11_device *sv11=d->priv;
164 z8530_ioctl(d,&sv11->sync.chanA,ifr,cmd) */
165 return sppp_do_ioctl(d, ifr,cmd);
166 }
167
hostess_get_stats(struct net_device * d)168 static struct net_device_stats *hostess_get_stats(struct net_device *d)
169 {
170 struct sv11_device *sv11=d->priv;
171 if(sv11)
172 return z8530_get_stats(&sv11->sync.chanA);
173 else
174 return NULL;
175 }
176
177 /*
178 * Passed PPP frames, fire them downwind.
179 */
180
hostess_queue_xmit(struct sk_buff * skb,struct net_device * d)181 static int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
182 {
183 struct sv11_device *sv11=d->priv;
184 return z8530_queue_xmit(&sv11->sync.chanA, skb);
185 }
186
hostess_neigh_setup(struct neighbour * n)187 static int hostess_neigh_setup(struct neighbour *n)
188 {
189 if (n->nud_state == NUD_NONE) {
190 n->ops = &arp_broken_ops;
191 n->output = n->ops->output;
192 }
193 return 0;
194 }
195
hostess_neigh_setup_dev(struct net_device * dev,struct neigh_parms * p)196 static int hostess_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
197 {
198 if (p->tbl->family == AF_INET) {
199 p->neigh_setup = hostess_neigh_setup;
200 p->ucast_probes = 0;
201 p->mcast_probes = 0;
202 }
203 return 0;
204 }
205
206 /*
207 * Description block for a Comtrol Hostess SV11 card
208 */
209
sv11_init(int iobase,int irq)210 static struct sv11_device *sv11_init(int iobase, int irq)
211 {
212 struct z8530_dev *dev;
213 struct sv11_device *sv;
214 unsigned long flags;
215
216 /*
217 * Get the needed I/O space
218 */
219
220 if(!request_region(iobase, 8, "Comtrol SV11"))
221 {
222 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n", iobase);
223 return NULL;
224 }
225
226 sv=(struct sv11_device *)kmalloc(sizeof(struct sv11_device), GFP_KERNEL);
227 if(!sv)
228 goto fail3;
229
230 memset(sv, 0, sizeof(*sv));
231 sv->if_ptr=&sv->netdev;
232
233 sv->netdev.dev=(struct net_device *)kmalloc(sizeof(struct net_device), GFP_KERNEL);
234 if(!sv->netdev.dev)
235 goto fail2;
236
237 dev=&sv->sync;
238
239 /*
240 * Stuff in the I/O addressing
241 */
242
243 dev->active = 0;
244
245 dev->chanA.ctrlio=iobase+1;
246 dev->chanA.dataio=iobase+3;
247 dev->chanB.ctrlio=-1;
248 dev->chanB.dataio=-1;
249 dev->chanA.irqs=&z8530_nop;
250 dev->chanB.irqs=&z8530_nop;
251
252 outb(0, iobase+4); /* DMA off */
253
254 /* We want a fast IRQ for this device. Actually we'd like an even faster
255 IRQ ;) - This is one driver RtLinux is made for */
256
257 if(request_irq(irq, &z8530_interrupt, SA_INTERRUPT, "Hostess SV/11", dev)<0)
258 {
259 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
260 goto fail1;
261 }
262
263 dev->irq=irq;
264 dev->chanA.private=sv;
265 dev->chanA.netdevice=sv->netdev.dev;
266 dev->chanA.dev=dev;
267 dev->chanB.dev=dev;
268
269 if(dma)
270 {
271 /*
272 * You can have DMA off or 1 and 3 thats the lot
273 * on the Comtrol.
274 */
275 dev->chanA.txdma=3;
276 dev->chanA.rxdma=1;
277 outb(0x03|0x08, iobase+4); /* DMA on */
278 if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
279 goto fail;
280
281 if(dma==1)
282 {
283 if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
284 goto dmafail;
285 }
286 }
287 save_flags(flags);
288 cli();
289
290 /*
291 * Begin normal initialise
292 */
293
294 if(z8530_init(dev)!=0)
295 {
296 printk(KERN_ERR "Z8530 series device not found.\n");
297 restore_flags(flags);
298 goto dmafail2;
299 }
300 z8530_channel_load(&dev->chanB, z8530_dead_port);
301 if(dev->type==Z85C30)
302 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
303 else
304 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
305
306 restore_flags(flags);
307
308
309 /*
310 * Now we can take the IRQ
311 */
312 if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
313 {
314 struct net_device *d=dev->chanA.netdevice;
315
316 /*
317 * Initialise the PPP components
318 */
319 sppp_attach(&sv->netdev);
320
321 /*
322 * Local fields
323 */
324
325 d->base_addr = iobase;
326 d->irq = irq;
327 d->priv = sv;
328 d->init = NULL;
329
330 d->open = hostess_open;
331 d->stop = hostess_close;
332 d->hard_start_xmit = hostess_queue_xmit;
333 d->get_stats = hostess_get_stats;
334 d->set_multicast_list = NULL;
335 d->do_ioctl = hostess_ioctl;
336 d->neigh_setup = hostess_neigh_setup_dev;
337 d->set_mac_address = NULL;
338
339 if(register_netdev(d)==-1)
340 {
341 printk(KERN_ERR "%s: unable to register device.\n",
342 d->name);
343 goto fail;
344 }
345
346 z8530_describe(dev, "I/O", iobase);
347 dev->active=1;
348 return sv;
349 }
350 dmafail2:
351 if(dma==1)
352 free_dma(dev->chanA.rxdma);
353 dmafail:
354 if(dma)
355 free_dma(dev->chanA.txdma);
356 fail:
357 free_irq(irq, dev);
358 fail1:
359 kfree(sv->netdev.dev);
360 fail2:
361 kfree(sv);
362 fail3:
363 release_region(iobase,8);
364 return NULL;
365 }
366
sv11_shutdown(struct sv11_device * dev)367 static void sv11_shutdown(struct sv11_device *dev)
368 {
369 sppp_detach(dev->netdev.dev);
370 z8530_shutdown(&dev->sync);
371 unregister_netdev(dev->netdev.dev);
372 free_irq(dev->sync.irq, dev);
373 if(dma)
374 {
375 if(dma==1)
376 free_dma(dev->sync.chanA.rxdma);
377 free_dma(dev->sync.chanA.txdma);
378 }
379 release_region(dev->sync.chanA.ctrlio-1, 8);
380 }
381
382 #ifdef MODULE
383
384 static int io=0x200;
385 static int irq=9;
386
387 MODULE_PARM(io,"i");
388 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
389 MODULE_PARM(dma,"i");
390 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
391 MODULE_PARM(irq,"i");
392 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
393
394 MODULE_AUTHOR("Alan Cox");
395 MODULE_LICENSE("GPL");
396 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
397
398 static struct sv11_device *sv11_unit;
399
init_module(void)400 int init_module(void)
401 {
402 printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.02.\n");
403 printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n");
404 if((sv11_unit=sv11_init(io,irq))==NULL)
405 return -ENODEV;
406 return 0;
407 }
408
cleanup_module(void)409 void cleanup_module(void)
410 {
411 if(sv11_unit)
412 sv11_shutdown(sv11_unit);
413 }
414
415 #endif
416
417