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_reset_mac_header(skb);
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 = kzalloc(sizeof(struct sv11_device), GFP_KERNEL);
235 if(!sv)
236 goto fail3;
237
238 sv->if_ptr=&sv->netdev;
239
240 sv->netdev.dev = alloc_netdev(0, "hdlc%d", sv11_setup);
241 if(!sv->netdev.dev)
242 goto fail2;
243
244 dev=&sv->sync;
245
246 /*
247 * Stuff in the I/O addressing
248 */
249
250 dev->active = 0;
251
252 dev->chanA.ctrlio=iobase+1;
253 dev->chanA.dataio=iobase+3;
254 dev->chanB.ctrlio=-1;
255 dev->chanB.dataio=-1;
256 dev->chanA.irqs=&z8530_nop;
257 dev->chanB.irqs=&z8530_nop;
258
259 outb(0, iobase+4); /* DMA off */
260
261 /* We want a fast IRQ for this device. Actually we'd like an even faster
262 IRQ ;) - This is one driver RtLinux is made for */
263
264 if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "Hostess SV11", dev)<0)
265 {
266 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
267 goto fail1;
268 }
269
270 dev->irq=irq;
271 dev->chanA.private=sv;
272 dev->chanA.netdevice=sv->netdev.dev;
273 dev->chanA.dev=dev;
274 dev->chanB.dev=dev;
275
276 if(dma)
277 {
278 /*
279 * You can have DMA off or 1 and 3 thats the lot
280 * on the Comtrol.
281 */
282 dev->chanA.txdma=3;
283 dev->chanA.rxdma=1;
284 outb(0x03|0x08, iobase+4); /* DMA on */
285 if(request_dma(dev->chanA.txdma, "Hostess SV/11 (TX)")!=0)
286 goto fail;
287
288 if(dma==1)
289 {
290 if(request_dma(dev->chanA.rxdma, "Hostess SV/11 (RX)")!=0)
291 goto dmafail;
292 }
293 }
294
295 /* Kill our private IRQ line the hostess can end up chattering
296 until the configuration is set */
297 disable_irq(irq);
298
299 /*
300 * Begin normal initialise
301 */
302
303 if(z8530_init(dev)!=0)
304 {
305 printk(KERN_ERR "Z8530 series device not found.\n");
306 enable_irq(irq);
307 goto dmafail2;
308 }
309 z8530_channel_load(&dev->chanB, z8530_dead_port);
310 if(dev->type==Z85C30)
311 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
312 else
313 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
314
315 enable_irq(irq);
316
317
318 /*
319 * Now we can take the IRQ
320 */
321 if(dev_alloc_name(dev->chanA.netdevice,"hdlc%d")>=0)
322 {
323 struct net_device *d=dev->chanA.netdevice;
324
325 /*
326 * Initialise the PPP components
327 */
328 sppp_attach(&sv->netdev);
329
330 /*
331 * Local fields
332 */
333
334 d->base_addr = iobase;
335 d->irq = irq;
336 d->priv = sv;
337
338 if(register_netdev(d))
339 {
340 printk(KERN_ERR "%s: unable to register device.\n",
341 d->name);
342 sppp_detach(d);
343 goto dmafail2;
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 free_netdev(sv->netdev.dev);
360 fail2:
361 kfree(sv);
362 fail3:
363 release_region(iobase,8);
364 return NULL;
365 }
366
367 static void sv11_shutdown(struct sv11_device *dev)
368 {
369 sppp_detach(dev->netdev.dev);
370 unregister_netdev(dev->netdev.dev);
371 z8530_shutdown(&dev->sync);
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 free_netdev(dev->netdev.dev);
381 kfree(dev);
382 }
383
384 #ifdef MODULE
385
386 static int io=0x200;
387 static int irq=9;
388
389 module_param(io, int, 0);
390 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
391 module_param(dma, int, 0);
392 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
393 module_param(irq, int, 0);
394 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
395
396 MODULE_AUTHOR("Alan Cox");
397 MODULE_LICENSE("GPL");
398 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
399
400 static struct sv11_device *sv11_unit;
401
402 int init_module(void)
403 {
404 printk(KERN_INFO "SV-11 Z85230 Synchronous Driver v 0.03.\n");
405 printk(KERN_INFO "(c) Copyright 2001, Red Hat Inc.\n");
406 if((sv11_unit=sv11_init(io,irq))==NULL)
407 return -ENODEV;
408 return 0;
409 }
410
411 void cleanup_module(void)
412 {
413 if(sv11_unit)
414 sv11_shutdown(sv11_unit);
415 }
416
417 #endif
418
419
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