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 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
21 */
22
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/net.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/delay.h>
31 #include <linux/hdlc.h>
32 #include <linux/ioport.h>
33 #include <net/arp.h>
34
35 #include <asm/irq.h>
36 #include <asm/io.h>
37 #include <asm/dma.h>
38 #include <asm/byteorder.h>
39 #include "z85230.h"
40
41 static int dma;
42
43 /*
44 * Network driver support routines
45 */
46
47 static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
48 {
49 return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
50 }
51
52 /*
53 * Frame receive. Simple for our card as we do HDLC 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 = hdlc_type_trans(skb, c->netdevice);
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 }
70
71 /*
72 * We've been placed in the UP state
73 */
74
75 static int hostess_open(struct net_device *d)
76 {
77 struct z8530_dev *sv11 = dev_to_sv(d);
78 int err = -1;
79
80 /*
81 * Link layer up
82 */
83 switch (dma) {
84 case 0:
85 err = z8530_sync_open(d, &sv11->chanA);
86 break;
87 case 1:
88 err = z8530_sync_dma_open(d, &sv11->chanA);
89 break;
90 case 2:
91 err = z8530_sync_txdma_open(d, &sv11->chanA);
92 break;
93 }
94
95 if (err)
96 return err;
97
98 err = hdlc_open(d);
99 if (err) {
100 switch (dma) {
101 case 0:
102 z8530_sync_close(d, &sv11->chanA);
103 break;
104 case 1:
105 z8530_sync_dma_close(d, &sv11->chanA);
106 break;
107 case 2:
108 z8530_sync_txdma_close(d, &sv11->chanA);
109 break;
110 }
111 return err;
112 }
113 sv11->chanA.rx_function = hostess_input;
114
115 /*
116 * Go go go
117 */
118
119 netif_start_queue(d);
120 return 0;
121 }
122
123 static int hostess_close(struct net_device *d)
124 {
125 struct z8530_dev *sv11 = dev_to_sv(d);
126 /*
127 * Discard new frames
128 */
129 sv11->chanA.rx_function = z8530_null_rx;
130
131 hdlc_close(d);
132 netif_stop_queue(d);
133
134 switch (dma) {
135 case 0:
136 z8530_sync_close(d, &sv11->chanA);
137 break;
138 case 1:
139 z8530_sync_dma_close(d, &sv11->chanA);
140 break;
141 case 2:
142 z8530_sync_txdma_close(d, &sv11->chanA);
143 break;
144 }
145 return 0;
146 }
147
148 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
149 {
150 /* struct z8530_dev *sv11=dev_to_sv(d);
151 z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
152 return hdlc_ioctl(d, ifr, cmd);
153 }
154
155 /*
156 * Passed network frames, fire them downwind.
157 */
158
159 static int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
160 {
161 return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
162 }
163
164 static int hostess_attach(struct net_device *dev, unsigned short encoding,
165 unsigned short parity)
166 {
167 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
168 return 0;
169 return -EINVAL;
170 }
171
172 /*
173 * Description block for a Comtrol Hostess SV11 card
174 */
175
176 static const struct net_device_ops hostess_ops = {
177 .ndo_open = hostess_open,
178 .ndo_stop = hostess_close,
179 .ndo_change_mtu = hdlc_change_mtu,
180 .ndo_start_xmit = hdlc_start_xmit,
181 .ndo_do_ioctl = hostess_ioctl,
182 };
183
184 static struct z8530_dev *sv11_init(int iobase, int irq)
185 {
186 struct z8530_dev *sv;
187 struct net_device *netdev;
188 /*
189 * Get the needed I/O space
190 */
191
192 if (!request_region(iobase, 8, "Comtrol SV11")) {
193 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n",
194 iobase);
195 return NULL;
196 }
197
198 sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
199 if (!sv)
200 goto err_kzalloc;
201
202 /*
203 * Stuff in the I/O addressing
204 */
205
206 sv->active = 0;
207
208 sv->chanA.ctrlio = iobase + 1;
209 sv->chanA.dataio = iobase + 3;
210 sv->chanB.ctrlio = -1;
211 sv->chanB.dataio = -1;
212 sv->chanA.irqs = &z8530_nop;
213 sv->chanB.irqs = &z8530_nop;
214
215 outb(0, iobase + 4); /* DMA off */
216
217 /* We want a fast IRQ for this device. Actually we'd like an even faster
218 IRQ ;) - This is one driver RtLinux is made for */
219
220 if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
221 "Hostess SV11", sv) < 0) {
222 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
223 goto err_irq;
224 }
225
226 sv->irq = irq;
227 sv->chanA.private = sv;
228 sv->chanA.dev = sv;
229 sv->chanB.dev = sv;
230
231 if (dma) {
232 /*
233 * You can have DMA off or 1 and 3 thats the lot
234 * on the Comtrol.
235 */
236 sv->chanA.txdma = 3;
237 sv->chanA.rxdma = 1;
238 outb(0x03 | 0x08, iobase + 4); /* DMA on */
239 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
240 goto err_txdma;
241
242 if (dma == 1)
243 if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
244 goto err_rxdma;
245 }
246
247 /* Kill our private IRQ line the hostess can end up chattering
248 until the configuration is set */
249 disable_irq(irq);
250
251 /*
252 * Begin normal initialise
253 */
254
255 if (z8530_init(sv)) {
256 printk(KERN_ERR "Z8530 series device not found.\n");
257 enable_irq(irq);
258 goto free_dma;
259 }
260 z8530_channel_load(&sv->chanB, z8530_dead_port);
261 if (sv->type == Z85C30)
262 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
263 else
264 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
265
266 enable_irq(irq);
267
268 /*
269 * Now we can take the IRQ
270 */
271
272 sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
273 if (!netdev)
274 goto free_dma;
275
276 dev_to_hdlc(netdev)->attach = hostess_attach;
277 dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
278 netdev->netdev_ops = &hostess_ops;
279 netdev->base_addr = iobase;
280 netdev->irq = irq;
281
282 if (register_hdlc_device(netdev)) {
283 printk(KERN_ERR "hostess: unable to register HDLC device.\n");
284 free_netdev(netdev);
285 goto free_dma;
286 }
287
288 z8530_describe(sv, "I/O", iobase);
289 sv->active = 1;
290 return sv;
291
292 free_dma:
293 if (dma == 1)
294 free_dma(sv->chanA.rxdma);
295 err_rxdma:
296 if (dma)
297 free_dma(sv->chanA.txdma);
298 err_txdma:
299 free_irq(irq, sv);
300 err_irq:
301 kfree(sv);
302 err_kzalloc:
303 release_region(iobase, 8);
304 return NULL;
305 }
306
307 static void sv11_shutdown(struct z8530_dev *dev)
308 {
309 unregister_hdlc_device(dev->chanA.netdevice);
310 z8530_shutdown(dev);
311 free_irq(dev->irq, dev);
312 if (dma) {
313 if (dma == 1)
314 free_dma(dev->chanA.rxdma);
315 free_dma(dev->chanA.txdma);
316 }
317 release_region(dev->chanA.ctrlio - 1, 8);
318 free_netdev(dev->chanA.netdevice);
319 kfree(dev);
320 }
321
322 static int io = 0x200;
323 static int irq = 9;
324
325 module_param(io, int, 0);
326 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
327 module_param(dma, int, 0);
328 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
329 module_param(irq, int, 0);
330 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
331
332 MODULE_AUTHOR("Alan Cox");
333 MODULE_LICENSE("GPL");
334 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
335
336 static struct z8530_dev *sv11_unit;
337
338 int init_module(void)
339 {
340 if ((sv11_unit = sv11_init(io, irq)) == NULL)
341 return -ENODEV;
342 return 0;
343 }
344
345 void cleanup_module(void)
346 {
347 if (sv11_unit)
348 sv11_shutdown(sv11_unit);
349 }
350
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