tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
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 isn't wired (why - beats me)
19 *
20 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/mm.h>
28#include <linux/net.h>
29#include <linux/skbuff.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/delay.h>
33#include <linux/hdlc.h>
34#include <linux/ioport.h>
35#include <linux/slab.h>
36#include <net/arp.h>
37
38#include <asm/irq.h>
39#include <asm/io.h>
40#include <asm/dma.h>
41#include <asm/byteorder.h>
42#include "z85230.h"
43
44static int dma;
45
46/* Network driver support routines
47 */
48
49static inline struct z8530_dev *dev_to_sv(struct net_device *dev)
50{
51 return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
52}
53
54/* Frame receive. Simple for our card as we do HDLC and there
55 * is no funny garbage involved
56 */
57
58static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
59{
60 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
61 skb_trim(skb, skb->len - 2);
62 skb->protocol = hdlc_type_trans(skb, c->netdevice);
63 skb_reset_mac_header(skb);
64 skb->dev = c->netdevice;
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/* We've been placed in the UP state
72 */
73
74static int hostess_open(struct net_device *d)
75{
76 struct z8530_dev *sv11 = dev_to_sv(d);
77 int err = -1;
78
79 /* Link layer up
80 */
81 switch (dma) {
82 case 0:
83 err = z8530_sync_open(d, &sv11->chanA);
84 break;
85 case 1:
86 err = z8530_sync_dma_open(d, &sv11->chanA);
87 break;
88 case 2:
89 err = z8530_sync_txdma_open(d, &sv11->chanA);
90 break;
91 }
92
93 if (err)
94 return err;
95
96 err = hdlc_open(d);
97 if (err) {
98 switch (dma) {
99 case 0:
100 z8530_sync_close(d, &sv11->chanA);
101 break;
102 case 1:
103 z8530_sync_dma_close(d, &sv11->chanA);
104 break;
105 case 2:
106 z8530_sync_txdma_close(d, &sv11->chanA);
107 break;
108 }
109 return err;
110 }
111 sv11->chanA.rx_function = hostess_input;
112
113 /*
114 * Go go go
115 */
116
117 netif_start_queue(d);
118 return 0;
119}
120
121static int hostess_close(struct net_device *d)
122{
123 struct z8530_dev *sv11 = dev_to_sv(d);
124 /* Discard new frames
125 */
126 sv11->chanA.rx_function = z8530_null_rx;
127
128 hdlc_close(d);
129 netif_stop_queue(d);
130
131 switch (dma) {
132 case 0:
133 z8530_sync_close(d, &sv11->chanA);
134 break;
135 case 1:
136 z8530_sync_dma_close(d, &sv11->chanA);
137 break;
138 case 2:
139 z8530_sync_txdma_close(d, &sv11->chanA);
140 break;
141 }
142 return 0;
143}
144
145static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
146{
147 return hdlc_ioctl(d, ifr, cmd);
148}
149
150/* Passed network frames, fire them downwind.
151 */
152
153static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
154 struct net_device *d)
155{
156 return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
157}
158
159static int hostess_attach(struct net_device *dev, unsigned short encoding,
160 unsigned short parity)
161{
162 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
163 return 0;
164 return -EINVAL;
165}
166
167/* Description block for a Comtrol Hostess SV11 card
168 */
169
170static const struct net_device_ops hostess_ops = {
171 .ndo_open = hostess_open,
172 .ndo_stop = hostess_close,
173 .ndo_start_xmit = hdlc_start_xmit,
174 .ndo_do_ioctl = hostess_ioctl,
175};
176
177static struct z8530_dev *sv11_init(int iobase, int irq)
178{
179 struct z8530_dev *sv;
180 struct net_device *netdev;
181 /* Get the needed I/O space
182 */
183
184 if (!request_region(iobase, 8, "Comtrol SV11")) {
185 pr_warn("I/O 0x%X already in use\n", iobase);
186 return NULL;
187 }
188
189 sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
190 if (!sv)
191 goto err_kzalloc;
192
193 /* Stuff in the I/O addressing
194 */
195
196 sv->active = 0;
197
198 sv->chanA.ctrlio = iobase + 1;
199 sv->chanA.dataio = iobase + 3;
200 sv->chanB.ctrlio = -1;
201 sv->chanB.dataio = -1;
202 sv->chanA.irqs = &z8530_nop;
203 sv->chanB.irqs = &z8530_nop;
204
205 outb(0, iobase + 4); /* DMA off */
206
207 /* We want a fast IRQ for this device. Actually we'd like an even faster
208 * IRQ ;) - This is one driver RtLinux is made for
209 */
210
211 if (request_irq(irq, z8530_interrupt, 0,
212 "Hostess SV11", sv) < 0) {
213 pr_warn("IRQ %d already in use\n", irq);
214 goto err_irq;
215 }
216
217 sv->irq = irq;
218 sv->chanA.private = sv;
219 sv->chanA.dev = sv;
220 sv->chanB.dev = sv;
221
222 if (dma) {
223 /* You can have DMA off or 1 and 3 thats the lot
224 * on the Comtrol.
225 */
226 sv->chanA.txdma = 3;
227 sv->chanA.rxdma = 1;
228 outb(0x03 | 0x08, iobase + 4); /* DMA on */
229 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
230 goto err_txdma;
231
232 if (dma == 1)
233 if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
234 goto err_rxdma;
235 }
236
237 /* Kill our private IRQ line the hostess can end up chattering
238 * until the configuration is set
239 */
240 disable_irq(irq);
241
242 /* Begin normal initialise
243 */
244
245 if (z8530_init(sv)) {
246 pr_err("Z8530 series device not found\n");
247 enable_irq(irq);
248 goto free_dma;
249 }
250 z8530_channel_load(&sv->chanB, z8530_dead_port);
251 if (sv->type == Z85C30)
252 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
253 else
254 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
255
256 enable_irq(irq);
257
258 /* Now we can take the IRQ
259 */
260
261 sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
262 if (!netdev)
263 goto free_dma;
264
265 dev_to_hdlc(netdev)->attach = hostess_attach;
266 dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
267 netdev->netdev_ops = &hostess_ops;
268 netdev->base_addr = iobase;
269 netdev->irq = irq;
270
271 if (register_hdlc_device(netdev)) {
272 pr_err("unable to register HDLC device\n");
273 free_netdev(netdev);
274 goto free_dma;
275 }
276
277 z8530_describe(sv, "I/O", iobase);
278 sv->active = 1;
279 return sv;
280
281free_dma:
282 if (dma == 1)
283 free_dma(sv->chanA.rxdma);
284err_rxdma:
285 if (dma)
286 free_dma(sv->chanA.txdma);
287err_txdma:
288 free_irq(irq, sv);
289err_irq:
290 kfree(sv);
291err_kzalloc:
292 release_region(iobase, 8);
293 return NULL;
294}
295
296static void sv11_shutdown(struct z8530_dev *dev)
297{
298 unregister_hdlc_device(dev->chanA.netdevice);
299 z8530_shutdown(dev);
300 free_irq(dev->irq, dev);
301 if (dma) {
302 if (dma == 1)
303 free_dma(dev->chanA.rxdma);
304 free_dma(dev->chanA.txdma);
305 }
306 release_region(dev->chanA.ctrlio - 1, 8);
307 free_netdev(dev->chanA.netdevice);
308 kfree(dev);
309}
310
311static int io = 0x200;
312static int irq = 9;
313
314module_param_hw(io, int, ioport, 0);
315MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
316module_param_hw(dma, int, dma, 0);
317MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
318module_param_hw(irq, int, irq, 0);
319MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
320
321MODULE_AUTHOR("Alan Cox");
322MODULE_LICENSE("GPL");
323MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
324
325static struct z8530_dev *sv11_unit;
326
327int init_module(void)
328{
329 sv11_unit = sv11_init(io, irq);
330 if (!sv11_unit)
331 return -ENODEV;
332 return 0;
333}
334
335void cleanup_module(void)
336{
337 if (sv11_unit)
338 sv11_shutdown(sv11_unit);
339}