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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Sealevel Systems 4021 driver.
4 *
5 * (c) Copyright 1999, 2001 Alan Cox
6 * (c) Copyright 2001 Red Hat Inc.
7 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/if_arp.h>
19#include <linux/delay.h>
20#include <linux/hdlc.h>
21#include <linux/ioport.h>
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <net/arp.h>
25
26#include <asm/irq.h>
27#include <asm/io.h>
28#include <asm/dma.h>
29#include <asm/byteorder.h>
30#include "z85230.h"
31
32
33struct slvl_device
34{
35 struct z8530_channel *chan;
36 int channel;
37};
38
39
40struct slvl_board
41{
42 struct slvl_device dev[2];
43 struct z8530_dev board;
44 int iobase;
45};
46
47/*
48 * Network driver support routines
49 */
50
51static inline struct slvl_device* dev_to_chan(struct net_device *dev)
52{
53 return (struct slvl_device *)dev_to_hdlc(dev)->priv;
54}
55
56/*
57 * Frame receive. Simple for our card as we do HDLC and there
58 * is no funny garbage involved
59 */
60
61static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
62{
63 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
64 skb_trim(skb, skb->len - 2);
65 skb->protocol = hdlc_type_trans(skb, c->netdevice);
66 skb_reset_mac_header(skb);
67 skb->dev = c->netdevice;
68 netif_rx(skb);
69}
70
71/*
72 * We've been placed in the UP state
73 */
74
75static int sealevel_open(struct net_device *d)
76{
77 struct slvl_device *slvl = dev_to_chan(d);
78 int err = -1;
79 int unit = slvl->channel;
80
81 /*
82 * Link layer up.
83 */
84
85 switch (unit) {
86 case 0:
87 err = z8530_sync_dma_open(d, slvl->chan);
88 break;
89 case 1:
90 err = z8530_sync_open(d, slvl->chan);
91 break;
92 }
93
94 if (err)
95 return err;
96
97 err = hdlc_open(d);
98 if (err) {
99 switch (unit) {
100 case 0:
101 z8530_sync_dma_close(d, slvl->chan);
102 break;
103 case 1:
104 z8530_sync_close(d, slvl->chan);
105 break;
106 }
107 return err;
108 }
109
110 slvl->chan->rx_function = sealevel_input;
111
112 /*
113 * Go go go
114 */
115 netif_start_queue(d);
116 return 0;
117}
118
119static int sealevel_close(struct net_device *d)
120{
121 struct slvl_device *slvl = dev_to_chan(d);
122 int unit = slvl->channel;
123
124 /*
125 * Discard new frames
126 */
127
128 slvl->chan->rx_function = z8530_null_rx;
129
130 hdlc_close(d);
131 netif_stop_queue(d);
132
133 switch (unit) {
134 case 0:
135 z8530_sync_dma_close(d, slvl->chan);
136 break;
137 case 1:
138 z8530_sync_close(d, slvl->chan);
139 break;
140 }
141 return 0;
142}
143
144static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
145{
146 /* struct slvl_device *slvl=dev_to_chan(d);
147 z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
148 return hdlc_ioctl(d, ifr, cmd);
149}
150
151/*
152 * Passed network frames, fire them downwind.
153 */
154
155static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
156 struct net_device *d)
157{
158 return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
159}
160
161static int sealevel_attach(struct net_device *dev, unsigned short encoding,
162 unsigned short parity)
163{
164 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
165 return 0;
166 return -EINVAL;
167}
168
169static const struct net_device_ops sealevel_ops = {
170 .ndo_open = sealevel_open,
171 .ndo_stop = sealevel_close,
172 .ndo_start_xmit = hdlc_start_xmit,
173 .ndo_do_ioctl = sealevel_ioctl,
174};
175
176static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
177{
178 struct net_device *dev = alloc_hdlcdev(sv);
179 if (!dev)
180 return -1;
181
182 dev_to_hdlc(dev)->attach = sealevel_attach;
183 dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
184 dev->netdev_ops = &sealevel_ops;
185 dev->base_addr = iobase;
186 dev->irq = irq;
187
188 if (register_hdlc_device(dev)) {
189 pr_err("unable to register HDLC device\n");
190 free_netdev(dev);
191 return -1;
192 }
193
194 sv->chan->netdevice = dev;
195 return 0;
196}
197
198
199/*
200 * Allocate and setup Sealevel board.
201 */
202
203static __init struct slvl_board *slvl_init(int iobase, int irq,
204 int txdma, int rxdma, int slow)
205{
206 struct z8530_dev *dev;
207 struct slvl_board *b;
208
209 /*
210 * Get the needed I/O space
211 */
212
213 if (!request_region(iobase, 8, "Sealevel 4021")) {
214 pr_warn("I/O 0x%X already in use\n", iobase);
215 return NULL;
216 }
217
218 b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
219 if (!b)
220 goto err_kzalloc;
221
222 b->dev[0].chan = &b->board.chanA;
223 b->dev[0].channel = 0;
224
225 b->dev[1].chan = &b->board.chanB;
226 b->dev[1].channel = 1;
227
228 dev = &b->board;
229
230 /*
231 * Stuff in the I/O addressing
232 */
233
234 dev->active = 0;
235
236 b->iobase = iobase;
237
238 /*
239 * Select 8530 delays for the old board
240 */
241
242 if (slow)
243 iobase |= Z8530_PORT_SLEEP;
244
245 dev->chanA.ctrlio = iobase + 1;
246 dev->chanA.dataio = iobase;
247 dev->chanB.ctrlio = iobase + 3;
248 dev->chanB.dataio = iobase + 2;
249
250 dev->chanA.irqs = &z8530_nop;
251 dev->chanB.irqs = &z8530_nop;
252
253 /*
254 * Assert DTR enable DMA
255 */
256
257 outb(3 | (1 << 7), b->iobase + 4);
258
259
260 /* We want a fast IRQ for this device. Actually we'd like an even faster
261 IRQ ;) - This is one driver RtLinux is made for */
262
263 if (request_irq(irq, z8530_interrupt, 0,
264 "SeaLevel", dev) < 0) {
265 pr_warn("IRQ %d already in use\n", irq);
266 goto err_request_irq;
267 }
268
269 dev->irq = irq;
270 dev->chanA.private = &b->dev[0];
271 dev->chanB.private = &b->dev[1];
272 dev->chanA.dev = dev;
273 dev->chanB.dev = dev;
274
275 dev->chanA.txdma = 3;
276 dev->chanA.rxdma = 1;
277 if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
278 goto err_dma_tx;
279
280 if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
281 goto err_dma_rx;
282
283 disable_irq(irq);
284
285 /*
286 * Begin normal initialise
287 */
288
289 if (z8530_init(dev) != 0) {
290 pr_err("Z8530 series device not found\n");
291 enable_irq(irq);
292 goto free_hw;
293 }
294 if (dev->type == Z85C30) {
295 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
296 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
297 } else {
298 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
299 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
300 }
301
302 /*
303 * Now we can take the IRQ
304 */
305
306 enable_irq(irq);
307
308 if (slvl_setup(&b->dev[0], iobase, irq))
309 goto free_hw;
310 if (slvl_setup(&b->dev[1], iobase, irq))
311 goto free_netdev0;
312
313 z8530_describe(dev, "I/O", iobase);
314 dev->active = 1;
315 return b;
316
317free_netdev0:
318 unregister_hdlc_device(b->dev[0].chan->netdevice);
319 free_netdev(b->dev[0].chan->netdevice);
320free_hw:
321 free_dma(dev->chanA.rxdma);
322err_dma_rx:
323 free_dma(dev->chanA.txdma);
324err_dma_tx:
325 free_irq(irq, dev);
326err_request_irq:
327 kfree(b);
328err_kzalloc:
329 release_region(iobase, 8);
330 return NULL;
331}
332
333static void __exit slvl_shutdown(struct slvl_board *b)
334{
335 int u;
336
337 z8530_shutdown(&b->board);
338
339 for (u = 0; u < 2; u++) {
340 struct net_device *d = b->dev[u].chan->netdevice;
341 unregister_hdlc_device(d);
342 free_netdev(d);
343 }
344
345 free_irq(b->board.irq, &b->board);
346 free_dma(b->board.chanA.rxdma);
347 free_dma(b->board.chanA.txdma);
348 /* DMA off on the card, drop DTR */
349 outb(0, b->iobase);
350 release_region(b->iobase, 8);
351 kfree(b);
352}
353
354
355static int io=0x238;
356static int txdma=1;
357static int rxdma=3;
358static int irq=5;
359static bool slow=false;
360
361module_param_hw(io, int, ioport, 0);
362MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
363module_param_hw(txdma, int, dma, 0);
364MODULE_PARM_DESC(txdma, "Transmit DMA channel");
365module_param_hw(rxdma, int, dma, 0);
366MODULE_PARM_DESC(rxdma, "Receive DMA channel");
367module_param_hw(irq, int, irq, 0);
368MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
369module_param(slow, bool, 0);
370MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
371
372MODULE_AUTHOR("Alan Cox");
373MODULE_LICENSE("GPL");
374MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
375
376static struct slvl_board *slvl_unit;
377
378static int __init slvl_init_module(void)
379{
380 slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
381
382 return slvl_unit ? 0 : -ENODEV;
383}
384
385static void __exit slvl_cleanup_module(void)
386{
387 if (slvl_unit)
388 slvl_shutdown(slvl_unit);
389}
390
391module_init(slvl_init_module);
392module_exit(slvl_cleanup_module);