tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
41static int dma;
42
43/*
44 * Network driver support routines
45 */
46
47static 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
57static 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
75static 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
123static 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
148static 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
159static 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
164static 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
176static struct z8530_dev *sv11_init(int iobase, int irq)
177{
178 struct z8530_dev *sv;
179 struct net_device *netdev;
180 /*
181 * Get the needed I/O space
182 */
183
184 if (!request_region(iobase, 8, "Comtrol SV11")) {
185 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n",
186 iobase);
187 return NULL;
188 }
189
190 sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
191 if (!sv)
192 goto err_kzalloc;
193
194 /*
195 * Stuff in the I/O addressing
196 */
197
198 sv->active = 0;
199
200 sv->chanA.ctrlio = iobase + 1;
201 sv->chanA.dataio = iobase + 3;
202 sv->chanB.ctrlio = -1;
203 sv->chanB.dataio = -1;
204 sv->chanA.irqs = &z8530_nop;
205 sv->chanB.irqs = &z8530_nop;
206
207 outb(0, iobase + 4); /* DMA off */
208
209 /* We want a fast IRQ for this device. Actually we'd like an even faster
210 IRQ ;) - This is one driver RtLinux is made for */
211
212 if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
213 "Hostess SV11", sv) < 0) {
214 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
215 goto err_irq;
216 }
217
218 sv->irq = irq;
219 sv->chanA.private = sv;
220 sv->chanA.dev = sv;
221 sv->chanB.dev = sv;
222
223 if (dma) {
224 /*
225 * You can have DMA off or 1 and 3 thats the lot
226 * on the Comtrol.
227 */
228 sv->chanA.txdma = 3;
229 sv->chanA.rxdma = 1;
230 outb(0x03 | 0x08, iobase + 4); /* DMA on */
231 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
232 goto err_txdma;
233
234 if (dma == 1)
235 if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
236 goto err_rxdma;
237 }
238
239 /* Kill our private IRQ line the hostess can end up chattering
240 until the configuration is set */
241 disable_irq(irq);
242
243 /*
244 * Begin normal initialise
245 */
246
247 if (z8530_init(sv)) {
248 printk(KERN_ERR "Z8530 series device not found.\n");
249 enable_irq(irq);
250 goto free_dma;
251 }
252 z8530_channel_load(&sv->chanB, z8530_dead_port);
253 if (sv->type == Z85C30)
254 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
255 else
256 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
257
258 enable_irq(irq);
259
260 /*
261 * Now we can take the IRQ
262 */
263
264 sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
265 if (!netdev)
266 goto free_dma;
267
268 dev_to_hdlc(netdev)->attach = hostess_attach;
269 dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
270 netdev->open = hostess_open;
271 netdev->stop = hostess_close;
272 netdev->do_ioctl = hostess_ioctl;
273 netdev->base_addr = iobase;
274 netdev->irq = irq;
275
276 if (register_hdlc_device(netdev)) {
277 printk(KERN_ERR "hostess: unable to register HDLC device.\n");
278 free_netdev(netdev);
279 goto free_dma;
280 }
281
282 z8530_describe(sv, "I/O", iobase);
283 sv->active = 1;
284 return sv;
285
286free_dma:
287 if (dma == 1)
288 free_dma(sv->chanA.rxdma);
289err_rxdma:
290 if (dma)
291 free_dma(sv->chanA.txdma);
292err_txdma:
293 free_irq(irq, sv);
294err_irq:
295 kfree(sv);
296err_kzalloc:
297 release_region(iobase, 8);
298 return NULL;
299}
300
301static void sv11_shutdown(struct z8530_dev *dev)
302{
303 unregister_hdlc_device(dev->chanA.netdevice);
304 z8530_shutdown(dev);
305 free_irq(dev->irq, dev);
306 if (dma) {
307 if (dma == 1)
308 free_dma(dev->chanA.rxdma);
309 free_dma(dev->chanA.txdma);
310 }
311 release_region(dev->chanA.ctrlio - 1, 8);
312 free_netdev(dev->chanA.netdevice);
313 kfree(dev);
314}
315
316static int io = 0x200;
317static int irq = 9;
318
319module_param(io, int, 0);
320MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
321module_param(dma, int, 0);
322MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
323module_param(irq, int, 0);
324MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
325
326MODULE_AUTHOR("Alan Cox");
327MODULE_LICENSE("GPL");
328MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
329
330static struct z8530_dev *sv11_unit;
331
332int init_module(void)
333{
334 if ((sv11_unit = sv11_init(io, irq)) == NULL)
335 return -ENODEV;
336 return 0;
337}
338
339void cleanup_module(void)
340{
341 if (sv11_unit)
342 sv11_shutdown(sv11_unit);
343}