1 /*
2 * sja1000.c - Philips SJA1000 network device driver
3 *
4 * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
5 * 38106 Braunschweig, GERMANY
6 *
7 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of Volkswagen nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * Alternatively, provided that this notice is retained in full, this
23 * software may be distributed under the terms of the GNU General
24 * Public License ("GPL") version 2, in which case the provisions of the
25 * GPL apply INSTEAD OF those given above.
26 *
27 * The provided data structures and external interfaces from this code
28 * are not restricted to be used by modules with a GPL compatible license.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
41 * DAMAGE.
42 *
43 */
44
45 #include <linux/module.h>
46 #include <linux/init.h>
47 #include <linux/kernel.h>
48 #include <linux/sched.h>
49 #include <linux/types.h>
50 #include <linux/fcntl.h>
51 #include <linux/interrupt.h>
52 #include <linux/ptrace.h>
53 #include <linux/string.h>
54 #include <linux/errno.h>
55 #include <linux/netdevice.h>
56 #include <linux/if_arp.h>
57 #include <linux/if_ether.h>
58 #include <linux/skbuff.h>
59 #include <linux/delay.h>
60
61 #include <linux/can/dev.h>
62 #include <linux/can/error.h>
63
64 #include "sja1000.h"
65
66 #define DRV_NAME "sja1000"
67
68 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
69 MODULE_LICENSE("Dual BSD/GPL");
70 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
71
72 static const struct can_bittiming_const sja1000_bittiming_const = {
73 .name = DRV_NAME,
74 .tseg1_min = 1,
75 .tseg1_max = 16,
76 .tseg2_min = 1,
77 .tseg2_max = 8,
78 .sjw_max = 4,
79 .brp_min = 1,
80 .brp_max = 64,
81 .brp_inc = 1,
82 };
83
sja1000_write_cmdreg(struct sja1000_priv * priv,u8 val)84 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
85 {
86 unsigned long flags;
87
88 /*
89 * The command register needs some locking and time to settle
90 * the write_reg() operation - especially on SMP systems.
91 */
92 spin_lock_irqsave(&priv->cmdreg_lock, flags);
93 priv->write_reg(priv, SJA1000_CMR, val);
94 priv->read_reg(priv, SJA1000_SR);
95 spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
96 }
97
sja1000_is_absent(struct sja1000_priv * priv)98 static int sja1000_is_absent(struct sja1000_priv *priv)
99 {
100 return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
101 }
102
sja1000_probe_chip(struct net_device * dev)103 static int sja1000_probe_chip(struct net_device *dev)
104 {
105 struct sja1000_priv *priv = netdev_priv(dev);
106
107 if (priv->reg_base && sja1000_is_absent(priv)) {
108 netdev_err(dev, "probing failed\n");
109 return 0;
110 }
111 return -1;
112 }
113
set_reset_mode(struct net_device * dev)114 static void set_reset_mode(struct net_device *dev)
115 {
116 struct sja1000_priv *priv = netdev_priv(dev);
117 unsigned char status = priv->read_reg(priv, SJA1000_MOD);
118 int i;
119
120 /* disable interrupts */
121 priv->write_reg(priv, SJA1000_IER, IRQ_OFF);
122
123 for (i = 0; i < 100; i++) {
124 /* check reset bit */
125 if (status & MOD_RM) {
126 priv->can.state = CAN_STATE_STOPPED;
127 return;
128 }
129
130 /* reset chip */
131 priv->write_reg(priv, SJA1000_MOD, MOD_RM);
132 udelay(10);
133 status = priv->read_reg(priv, SJA1000_MOD);
134 }
135
136 netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
137 }
138
set_normal_mode(struct net_device * dev)139 static void set_normal_mode(struct net_device *dev)
140 {
141 struct sja1000_priv *priv = netdev_priv(dev);
142 unsigned char status = priv->read_reg(priv, SJA1000_MOD);
143 u8 mod_reg_val = 0x00;
144 int i;
145
146 for (i = 0; i < 100; i++) {
147 /* check reset bit */
148 if ((status & MOD_RM) == 0) {
149 priv->can.state = CAN_STATE_ERROR_ACTIVE;
150 /* enable interrupts */
151 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
152 priv->write_reg(priv, SJA1000_IER, IRQ_ALL);
153 else
154 priv->write_reg(priv, SJA1000_IER,
155 IRQ_ALL & ~IRQ_BEI);
156 return;
157 }
158
159 /* set chip to normal mode */
160 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
161 mod_reg_val |= MOD_LOM;
162 if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
163 mod_reg_val |= MOD_STM;
164 priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
165
166 udelay(10);
167
168 status = priv->read_reg(priv, SJA1000_MOD);
169 }
170
171 netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
172 }
173
174 /*
175 * initialize SJA1000 chip:
176 * - reset chip
177 * - set output mode
178 * - set baudrate
179 * - enable interrupts
180 * - start operating mode
181 */
chipset_init(struct net_device * dev)182 static void chipset_init(struct net_device *dev)
183 {
184 struct sja1000_priv *priv = netdev_priv(dev);
185
186 /* set clock divider and output control register */
187 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
188
189 /* set acceptance filter (accept all) */
190 priv->write_reg(priv, SJA1000_ACCC0, 0x00);
191 priv->write_reg(priv, SJA1000_ACCC1, 0x00);
192 priv->write_reg(priv, SJA1000_ACCC2, 0x00);
193 priv->write_reg(priv, SJA1000_ACCC3, 0x00);
194
195 priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
196 priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
197 priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
198 priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
199
200 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
201 }
202
sja1000_start(struct net_device * dev)203 static void sja1000_start(struct net_device *dev)
204 {
205 struct sja1000_priv *priv = netdev_priv(dev);
206
207 /* leave reset mode */
208 if (priv->can.state != CAN_STATE_STOPPED)
209 set_reset_mode(dev);
210
211 /* Initialize chip if uninitialized at this stage */
212 if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
213 chipset_init(dev);
214
215 /* Clear error counters and error code capture */
216 priv->write_reg(priv, SJA1000_TXERR, 0x0);
217 priv->write_reg(priv, SJA1000_RXERR, 0x0);
218 priv->read_reg(priv, SJA1000_ECC);
219
220 /* clear interrupt flags */
221 priv->read_reg(priv, SJA1000_IR);
222
223 /* leave reset mode */
224 set_normal_mode(dev);
225 }
226
sja1000_set_mode(struct net_device * dev,enum can_mode mode)227 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
228 {
229 switch (mode) {
230 case CAN_MODE_START:
231 sja1000_start(dev);
232 if (netif_queue_stopped(dev))
233 netif_wake_queue(dev);
234 break;
235
236 default:
237 return -EOPNOTSUPP;
238 }
239
240 return 0;
241 }
242
sja1000_set_bittiming(struct net_device * dev)243 static int sja1000_set_bittiming(struct net_device *dev)
244 {
245 struct sja1000_priv *priv = netdev_priv(dev);
246 struct can_bittiming *bt = &priv->can.bittiming;
247 u8 btr0, btr1;
248
249 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
250 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
251 (((bt->phase_seg2 - 1) & 0x7) << 4);
252 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
253 btr1 |= 0x80;
254
255 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
256
257 priv->write_reg(priv, SJA1000_BTR0, btr0);
258 priv->write_reg(priv, SJA1000_BTR1, btr1);
259
260 return 0;
261 }
262
sja1000_get_berr_counter(const struct net_device * dev,struct can_berr_counter * bec)263 static int sja1000_get_berr_counter(const struct net_device *dev,
264 struct can_berr_counter *bec)
265 {
266 struct sja1000_priv *priv = netdev_priv(dev);
267
268 bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
269 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
270
271 return 0;
272 }
273
274 /*
275 * transmit a CAN message
276 * message layout in the sk_buff should be like this:
277 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77
278 * [ can-id ] [flags] [len] [can data (up to 8 bytes]
279 */
sja1000_start_xmit(struct sk_buff * skb,struct net_device * dev)280 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
281 struct net_device *dev)
282 {
283 struct sja1000_priv *priv = netdev_priv(dev);
284 struct can_frame *cf = (struct can_frame *)skb->data;
285 uint8_t fi;
286 canid_t id;
287 uint8_t dreg;
288 u8 cmd_reg_val = 0x00;
289 int i;
290
291 if (can_dropped_invalid_skb(dev, skb))
292 return NETDEV_TX_OK;
293
294 netif_stop_queue(dev);
295
296 fi = can_get_cc_dlc(cf, priv->can.ctrlmode);
297 id = cf->can_id;
298
299 if (id & CAN_RTR_FLAG)
300 fi |= SJA1000_FI_RTR;
301
302 if (id & CAN_EFF_FLAG) {
303 fi |= SJA1000_FI_FF;
304 dreg = SJA1000_EFF_BUF;
305 priv->write_reg(priv, SJA1000_FI, fi);
306 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
307 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
308 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
309 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
310 } else {
311 dreg = SJA1000_SFF_BUF;
312 priv->write_reg(priv, SJA1000_FI, fi);
313 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
314 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
315 }
316
317 for (i = 0; i < cf->len; i++)
318 priv->write_reg(priv, dreg++, cf->data[i]);
319
320 can_put_echo_skb(skb, dev, 0, 0);
321
322 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
323 cmd_reg_val |= CMD_AT;
324
325 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
326 cmd_reg_val |= CMD_SRR;
327 else
328 cmd_reg_val |= CMD_TR;
329
330 sja1000_write_cmdreg(priv, cmd_reg_val);
331
332 return NETDEV_TX_OK;
333 }
334
sja1000_rx(struct net_device * dev)335 static void sja1000_rx(struct net_device *dev)
336 {
337 struct sja1000_priv *priv = netdev_priv(dev);
338 struct net_device_stats *stats = &dev->stats;
339 struct can_frame *cf;
340 struct sk_buff *skb;
341 uint8_t fi;
342 uint8_t dreg;
343 canid_t id;
344 int i;
345
346 /* create zero'ed CAN frame buffer */
347 skb = alloc_can_skb(dev, &cf);
348 if (skb == NULL)
349 return;
350
351 fi = priv->read_reg(priv, SJA1000_FI);
352
353 if (fi & SJA1000_FI_FF) {
354 /* extended frame format (EFF) */
355 dreg = SJA1000_EFF_BUF;
356 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
357 | (priv->read_reg(priv, SJA1000_ID2) << 13)
358 | (priv->read_reg(priv, SJA1000_ID3) << 5)
359 | (priv->read_reg(priv, SJA1000_ID4) >> 3);
360 id |= CAN_EFF_FLAG;
361 } else {
362 /* standard frame format (SFF) */
363 dreg = SJA1000_SFF_BUF;
364 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
365 | (priv->read_reg(priv, SJA1000_ID2) >> 5);
366 }
367
368 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode);
369 if (fi & SJA1000_FI_RTR) {
370 id |= CAN_RTR_FLAG;
371 } else {
372 for (i = 0; i < cf->len; i++)
373 cf->data[i] = priv->read_reg(priv, dreg++);
374
375 stats->rx_bytes += cf->len;
376 }
377 stats->rx_packets++;
378
379 cf->can_id = id;
380
381 /* release receive buffer */
382 sja1000_write_cmdreg(priv, CMD_RRB);
383
384 netif_rx(skb);
385 }
386
sja1000_err(struct net_device * dev,uint8_t isrc,uint8_t status)387 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
388 {
389 struct sja1000_priv *priv = netdev_priv(dev);
390 struct net_device_stats *stats = &dev->stats;
391 struct can_frame *cf;
392 struct sk_buff *skb;
393 enum can_state state = priv->can.state;
394 enum can_state rx_state, tx_state;
395 unsigned int rxerr, txerr;
396 uint8_t ecc, alc;
397
398 skb = alloc_can_err_skb(dev, &cf);
399 if (skb == NULL)
400 return -ENOMEM;
401
402 txerr = priv->read_reg(priv, SJA1000_TXERR);
403 rxerr = priv->read_reg(priv, SJA1000_RXERR);
404
405 if (isrc & IRQ_DOI) {
406 /* data overrun interrupt */
407 netdev_dbg(dev, "data overrun interrupt\n");
408 cf->can_id |= CAN_ERR_CRTL;
409 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
410 stats->rx_over_errors++;
411 stats->rx_errors++;
412 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
413 }
414
415 if (isrc & IRQ_EI) {
416 /* error warning interrupt */
417 netdev_dbg(dev, "error warning interrupt\n");
418
419 if (status & SR_BS)
420 state = CAN_STATE_BUS_OFF;
421 else if (status & SR_ES)
422 state = CAN_STATE_ERROR_WARNING;
423 else
424 state = CAN_STATE_ERROR_ACTIVE;
425 }
426 if (state != CAN_STATE_BUS_OFF) {
427 cf->data[6] = txerr;
428 cf->data[7] = rxerr;
429 }
430 if (isrc & IRQ_BEI) {
431 /* bus error interrupt */
432 priv->can.can_stats.bus_error++;
433 stats->rx_errors++;
434
435 ecc = priv->read_reg(priv, SJA1000_ECC);
436
437 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
438
439 /* set error type */
440 switch (ecc & ECC_MASK) {
441 case ECC_BIT:
442 cf->data[2] |= CAN_ERR_PROT_BIT;
443 break;
444 case ECC_FORM:
445 cf->data[2] |= CAN_ERR_PROT_FORM;
446 break;
447 case ECC_STUFF:
448 cf->data[2] |= CAN_ERR_PROT_STUFF;
449 break;
450 default:
451 break;
452 }
453
454 /* set error location */
455 cf->data[3] = ecc & ECC_SEG;
456
457 /* Error occurred during transmission? */
458 if ((ecc & ECC_DIR) == 0)
459 cf->data[2] |= CAN_ERR_PROT_TX;
460 }
461 if (isrc & IRQ_EPI) {
462 /* error passive interrupt */
463 netdev_dbg(dev, "error passive interrupt\n");
464
465 if (state == CAN_STATE_ERROR_PASSIVE)
466 state = CAN_STATE_ERROR_WARNING;
467 else
468 state = CAN_STATE_ERROR_PASSIVE;
469 }
470 if (isrc & IRQ_ALI) {
471 /* arbitration lost interrupt */
472 netdev_dbg(dev, "arbitration lost interrupt\n");
473 alc = priv->read_reg(priv, SJA1000_ALC);
474 priv->can.can_stats.arbitration_lost++;
475 cf->can_id |= CAN_ERR_LOSTARB;
476 cf->data[0] = alc & 0x1f;
477 }
478
479 if (state != priv->can.state) {
480 tx_state = txerr >= rxerr ? state : 0;
481 rx_state = txerr <= rxerr ? state : 0;
482
483 can_change_state(dev, cf, tx_state, rx_state);
484
485 if(state == CAN_STATE_BUS_OFF)
486 can_bus_off(dev);
487 }
488
489 netif_rx(skb);
490
491 return 0;
492 }
493
sja1000_interrupt(int irq,void * dev_id)494 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
495 {
496 struct net_device *dev = (struct net_device *)dev_id;
497 struct sja1000_priv *priv = netdev_priv(dev);
498 struct net_device_stats *stats = &dev->stats;
499 uint8_t isrc, status;
500 int n = 0;
501
502 if (priv->pre_irq)
503 priv->pre_irq(priv);
504
505 /* Shared interrupts and IRQ off? */
506 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
507 goto out;
508
509 while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
510 (n < SJA1000_MAX_IRQ)) {
511
512 status = priv->read_reg(priv, SJA1000_SR);
513 /* check for absent controller due to hw unplug */
514 if (status == 0xFF && sja1000_is_absent(priv))
515 goto out;
516
517 if (isrc & IRQ_WUI)
518 netdev_warn(dev, "wakeup interrupt\n");
519
520 if (isrc & IRQ_TI) {
521 /* transmission buffer released */
522 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
523 !(status & SR_TCS)) {
524 stats->tx_errors++;
525 can_free_echo_skb(dev, 0, NULL);
526 } else {
527 /* transmission complete */
528 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
529 stats->tx_packets++;
530 }
531 netif_wake_queue(dev);
532 }
533 if (isrc & IRQ_RI) {
534 /* receive interrupt */
535 while (status & SR_RBS) {
536 sja1000_rx(dev);
537 status = priv->read_reg(priv, SJA1000_SR);
538 /* check for absent controller */
539 if (status == 0xFF && sja1000_is_absent(priv))
540 goto out;
541 }
542 }
543 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
544 /* error interrupt */
545 if (sja1000_err(dev, isrc, status))
546 break;
547 }
548 n++;
549 }
550 out:
551 if (priv->post_irq)
552 priv->post_irq(priv);
553
554 if (n >= SJA1000_MAX_IRQ)
555 netdev_dbg(dev, "%d messages handled in ISR", n);
556
557 return (n) ? IRQ_HANDLED : IRQ_NONE;
558 }
559 EXPORT_SYMBOL_GPL(sja1000_interrupt);
560
sja1000_open(struct net_device * dev)561 static int sja1000_open(struct net_device *dev)
562 {
563 struct sja1000_priv *priv = netdev_priv(dev);
564 int err;
565
566 /* set chip into reset mode */
567 set_reset_mode(dev);
568
569 /* common open */
570 err = open_candev(dev);
571 if (err)
572 return err;
573
574 /* register interrupt handler, if not done by the device driver */
575 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
576 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
577 dev->name, (void *)dev);
578 if (err) {
579 close_candev(dev);
580 return -EAGAIN;
581 }
582 }
583
584 /* init and start chi */
585 sja1000_start(dev);
586
587 netif_start_queue(dev);
588
589 return 0;
590 }
591
sja1000_close(struct net_device * dev)592 static int sja1000_close(struct net_device *dev)
593 {
594 struct sja1000_priv *priv = netdev_priv(dev);
595
596 netif_stop_queue(dev);
597 set_reset_mode(dev);
598
599 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
600 free_irq(dev->irq, (void *)dev);
601
602 close_candev(dev);
603
604 return 0;
605 }
606
alloc_sja1000dev(int sizeof_priv)607 struct net_device *alloc_sja1000dev(int sizeof_priv)
608 {
609 struct net_device *dev;
610 struct sja1000_priv *priv;
611
612 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
613 SJA1000_ECHO_SKB_MAX);
614 if (!dev)
615 return NULL;
616
617 priv = netdev_priv(dev);
618
619 priv->dev = dev;
620 priv->can.bittiming_const = &sja1000_bittiming_const;
621 priv->can.do_set_bittiming = sja1000_set_bittiming;
622 priv->can.do_set_mode = sja1000_set_mode;
623 priv->can.do_get_berr_counter = sja1000_get_berr_counter;
624 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
625 CAN_CTRLMODE_LISTENONLY |
626 CAN_CTRLMODE_3_SAMPLES |
627 CAN_CTRLMODE_ONE_SHOT |
628 CAN_CTRLMODE_BERR_REPORTING |
629 CAN_CTRLMODE_PRESUME_ACK |
630 CAN_CTRLMODE_CC_LEN8_DLC;
631
632 spin_lock_init(&priv->cmdreg_lock);
633
634 if (sizeof_priv)
635 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
636
637 return dev;
638 }
639 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
640
free_sja1000dev(struct net_device * dev)641 void free_sja1000dev(struct net_device *dev)
642 {
643 free_candev(dev);
644 }
645 EXPORT_SYMBOL_GPL(free_sja1000dev);
646
647 static const struct net_device_ops sja1000_netdev_ops = {
648 .ndo_open = sja1000_open,
649 .ndo_stop = sja1000_close,
650 .ndo_start_xmit = sja1000_start_xmit,
651 .ndo_change_mtu = can_change_mtu,
652 };
653
register_sja1000dev(struct net_device * dev)654 int register_sja1000dev(struct net_device *dev)
655 {
656 int ret;
657
658 if (!sja1000_probe_chip(dev))
659 return -ENODEV;
660
661 dev->flags |= IFF_ECHO; /* we support local echo */
662 dev->netdev_ops = &sja1000_netdev_ops;
663
664 set_reset_mode(dev);
665 chipset_init(dev);
666
667 ret = register_candev(dev);
668
669 return ret;
670 }
671 EXPORT_SYMBOL_GPL(register_sja1000dev);
672
unregister_sja1000dev(struct net_device * dev)673 void unregister_sja1000dev(struct net_device *dev)
674 {
675 set_reset_mode(dev);
676 unregister_candev(dev);
677 }
678 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
679
sja1000_init(void)680 static __init int sja1000_init(void)
681 {
682 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
683
684 return 0;
685 }
686
687 module_init(sja1000_init);
688
sja1000_exit(void)689 static __exit void sja1000_exit(void)
690 {
691 printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
692 }
693
694 module_exit(sja1000_exit);
695