Loading...
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#include <linux/can/led.h>
64
65#include "sja1000.h"
66
67#define DRV_NAME "sja1000"
68
69MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
70MODULE_LICENSE("Dual BSD/GPL");
71MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
72
73static const struct can_bittiming_const sja1000_bittiming_const = {
74 .name = DRV_NAME,
75 .tseg1_min = 1,
76 .tseg1_max = 16,
77 .tseg2_min = 1,
78 .tseg2_max = 8,
79 .sjw_max = 4,
80 .brp_min = 1,
81 .brp_max = 64,
82 .brp_inc = 1,
83};
84
85static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
86{
87 unsigned long flags;
88
89 /*
90 * The command register needs some locking and time to settle
91 * the write_reg() operation - especially on SMP systems.
92 */
93 spin_lock_irqsave(&priv->cmdreg_lock, flags);
94 priv->write_reg(priv, SJA1000_CMR, val);
95 priv->read_reg(priv, SJA1000_SR);
96 spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
97}
98
99static int sja1000_is_absent(struct sja1000_priv *priv)
100{
101 return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
102}
103
104static int sja1000_probe_chip(struct net_device *dev)
105{
106 struct sja1000_priv *priv = netdev_priv(dev);
107
108 if (priv->reg_base && sja1000_is_absent(priv)) {
109 netdev_err(dev, "probing failed\n");
110 return 0;
111 }
112 return -1;
113}
114
115static void set_reset_mode(struct net_device *dev)
116{
117 struct sja1000_priv *priv = netdev_priv(dev);
118 unsigned char status = priv->read_reg(priv, SJA1000_MOD);
119 int i;
120
121 /* disable interrupts */
122 priv->write_reg(priv, SJA1000_IER, IRQ_OFF);
123
124 for (i = 0; i < 100; i++) {
125 /* check reset bit */
126 if (status & MOD_RM) {
127 priv->can.state = CAN_STATE_STOPPED;
128 return;
129 }
130
131 /* reset chip */
132 priv->write_reg(priv, SJA1000_MOD, MOD_RM);
133 udelay(10);
134 status = priv->read_reg(priv, SJA1000_MOD);
135 }
136
137 netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
138}
139
140static void set_normal_mode(struct net_device *dev)
141{
142 struct sja1000_priv *priv = netdev_priv(dev);
143 unsigned char status = priv->read_reg(priv, SJA1000_MOD);
144 u8 mod_reg_val = 0x00;
145 int i;
146
147 for (i = 0; i < 100; i++) {
148 /* check reset bit */
149 if ((status & MOD_RM) == 0) {
150 priv->can.state = CAN_STATE_ERROR_ACTIVE;
151 /* enable interrupts */
152 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
153 priv->write_reg(priv, SJA1000_IER, IRQ_ALL);
154 else
155 priv->write_reg(priv, SJA1000_IER,
156 IRQ_ALL & ~IRQ_BEI);
157 return;
158 }
159
160 /* set chip to normal mode */
161 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
162 mod_reg_val |= MOD_LOM;
163 if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
164 mod_reg_val |= MOD_STM;
165 priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
166
167 udelay(10);
168
169 status = priv->read_reg(priv, SJA1000_MOD);
170 }
171
172 netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
173}
174
175/*
176 * initialize SJA1000 chip:
177 * - reset chip
178 * - set output mode
179 * - set baudrate
180 * - enable interrupts
181 * - start operating mode
182 */
183static void chipset_init(struct net_device *dev)
184{
185 struct sja1000_priv *priv = netdev_priv(dev);
186
187 /* set clock divider and output control register */
188 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
189
190 /* set acceptance filter (accept all) */
191 priv->write_reg(priv, SJA1000_ACCC0, 0x00);
192 priv->write_reg(priv, SJA1000_ACCC1, 0x00);
193 priv->write_reg(priv, SJA1000_ACCC2, 0x00);
194 priv->write_reg(priv, SJA1000_ACCC3, 0x00);
195
196 priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
197 priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
198 priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
199 priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
200
201 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
202}
203
204static void sja1000_start(struct net_device *dev)
205{
206 struct sja1000_priv *priv = netdev_priv(dev);
207
208 /* leave reset mode */
209 if (priv->can.state != CAN_STATE_STOPPED)
210 set_reset_mode(dev);
211
212 /* Initialize chip if uninitialized at this stage */
213 if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
214 chipset_init(dev);
215
216 /* Clear error counters and error code capture */
217 priv->write_reg(priv, SJA1000_TXERR, 0x0);
218 priv->write_reg(priv, SJA1000_RXERR, 0x0);
219 priv->read_reg(priv, SJA1000_ECC);
220
221 /* clear interrupt flags */
222 priv->read_reg(priv, SJA1000_IR);
223
224 /* leave reset mode */
225 set_normal_mode(dev);
226}
227
228static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
229{
230 switch (mode) {
231 case CAN_MODE_START:
232 sja1000_start(dev);
233 if (netif_queue_stopped(dev))
234 netif_wake_queue(dev);
235 break;
236
237 default:
238 return -EOPNOTSUPP;
239 }
240
241 return 0;
242}
243
244static int sja1000_set_bittiming(struct net_device *dev)
245{
246 struct sja1000_priv *priv = netdev_priv(dev);
247 struct can_bittiming *bt = &priv->can.bittiming;
248 u8 btr0, btr1;
249
250 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
251 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
252 (((bt->phase_seg2 - 1) & 0x7) << 4);
253 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
254 btr1 |= 0x80;
255
256 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
257
258 priv->write_reg(priv, SJA1000_BTR0, btr0);
259 priv->write_reg(priv, SJA1000_BTR1, btr1);
260
261 return 0;
262}
263
264static int sja1000_get_berr_counter(const struct net_device *dev,
265 struct can_berr_counter *bec)
266{
267 struct sja1000_priv *priv = netdev_priv(dev);
268
269 bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
270 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
271
272 return 0;
273}
274
275/*
276 * transmit a CAN message
277 * message layout in the sk_buff should be like this:
278 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77
279 * [ can-id ] [flags] [len] [can data (up to 8 bytes]
280 */
281static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
282 struct net_device *dev)
283{
284 struct sja1000_priv *priv = netdev_priv(dev);
285 struct can_frame *cf = (struct can_frame *)skb->data;
286 uint8_t fi;
287 uint8_t dlc;
288 canid_t id;
289 uint8_t dreg;
290 u8 cmd_reg_val = 0x00;
291 int i;
292
293 if (can_dropped_invalid_skb(dev, skb))
294 return NETDEV_TX_OK;
295
296 netif_stop_queue(dev);
297
298 fi = dlc = cf->can_dlc;
299 id = cf->can_id;
300
301 if (id & CAN_RTR_FLAG)
302 fi |= SJA1000_FI_RTR;
303
304 if (id & CAN_EFF_FLAG) {
305 fi |= SJA1000_FI_FF;
306 dreg = SJA1000_EFF_BUF;
307 priv->write_reg(priv, SJA1000_FI, fi);
308 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
309 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
310 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
311 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
312 } else {
313 dreg = SJA1000_SFF_BUF;
314 priv->write_reg(priv, SJA1000_FI, fi);
315 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
316 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
317 }
318
319 for (i = 0; i < dlc; i++)
320 priv->write_reg(priv, dreg++, cf->data[i]);
321
322 can_put_echo_skb(skb, dev, 0);
323
324 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
325 cmd_reg_val |= CMD_AT;
326
327 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
328 cmd_reg_val |= CMD_SRR;
329 else
330 cmd_reg_val |= CMD_TR;
331
332 sja1000_write_cmdreg(priv, cmd_reg_val);
333
334 return NETDEV_TX_OK;
335}
336
337static void sja1000_rx(struct net_device *dev)
338{
339 struct sja1000_priv *priv = netdev_priv(dev);
340 struct net_device_stats *stats = &dev->stats;
341 struct can_frame *cf;
342 struct sk_buff *skb;
343 uint8_t fi;
344 uint8_t dreg;
345 canid_t id;
346 int i;
347
348 /* create zero'ed CAN frame buffer */
349 skb = alloc_can_skb(dev, &cf);
350 if (skb == NULL)
351 return;
352
353 fi = priv->read_reg(priv, SJA1000_FI);
354
355 if (fi & SJA1000_FI_FF) {
356 /* extended frame format (EFF) */
357 dreg = SJA1000_EFF_BUF;
358 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
359 | (priv->read_reg(priv, SJA1000_ID2) << 13)
360 | (priv->read_reg(priv, SJA1000_ID3) << 5)
361 | (priv->read_reg(priv, SJA1000_ID4) >> 3);
362 id |= CAN_EFF_FLAG;
363 } else {
364 /* standard frame format (SFF) */
365 dreg = SJA1000_SFF_BUF;
366 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
367 | (priv->read_reg(priv, SJA1000_ID2) >> 5);
368 }
369
370 cf->can_dlc = get_can_dlc(fi & 0x0F);
371 if (fi & SJA1000_FI_RTR) {
372 id |= CAN_RTR_FLAG;
373 } else {
374 for (i = 0; i < cf->can_dlc; i++)
375 cf->data[i] = priv->read_reg(priv, dreg++);
376 }
377
378 cf->can_id = id;
379
380 /* release receive buffer */
381 sja1000_write_cmdreg(priv, CMD_RRB);
382
383 stats->rx_packets++;
384 stats->rx_bytes += cf->can_dlc;
385 netif_rx(skb);
386
387 can_led_event(dev, CAN_LED_EVENT_RX);
388}
389
390static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
391{
392 struct sja1000_priv *priv = netdev_priv(dev);
393 struct net_device_stats *stats = &dev->stats;
394 struct can_frame *cf;
395 struct sk_buff *skb;
396 enum can_state state = priv->can.state;
397 enum can_state rx_state, tx_state;
398 unsigned int rxerr, txerr;
399 uint8_t ecc, alc;
400
401 skb = alloc_can_err_skb(dev, &cf);
402 if (skb == NULL)
403 return -ENOMEM;
404
405 txerr = priv->read_reg(priv, SJA1000_TXERR);
406 rxerr = priv->read_reg(priv, SJA1000_RXERR);
407
408 cf->data[6] = txerr;
409 cf->data[7] = rxerr;
410
411 if (isrc & IRQ_DOI) {
412 /* data overrun interrupt */
413 netdev_dbg(dev, "data overrun interrupt\n");
414 cf->can_id |= CAN_ERR_CRTL;
415 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
416 stats->rx_over_errors++;
417 stats->rx_errors++;
418 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
419 }
420
421 if (isrc & IRQ_EI) {
422 /* error warning interrupt */
423 netdev_dbg(dev, "error warning interrupt\n");
424
425 if (status & SR_BS)
426 state = CAN_STATE_BUS_OFF;
427 else if (status & SR_ES)
428 state = CAN_STATE_ERROR_WARNING;
429 else
430 state = CAN_STATE_ERROR_ACTIVE;
431 }
432 if (isrc & IRQ_BEI) {
433 /* bus error interrupt */
434 priv->can.can_stats.bus_error++;
435 stats->rx_errors++;
436
437 ecc = priv->read_reg(priv, SJA1000_ECC);
438
439 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
440
441 /* set error type */
442 switch (ecc & ECC_MASK) {
443 case ECC_BIT:
444 cf->data[2] |= CAN_ERR_PROT_BIT;
445 break;
446 case ECC_FORM:
447 cf->data[2] |= CAN_ERR_PROT_FORM;
448 break;
449 case ECC_STUFF:
450 cf->data[2] |= CAN_ERR_PROT_STUFF;
451 break;
452 default:
453 break;
454 }
455
456 /* set error location */
457 cf->data[3] = ecc & ECC_SEG;
458
459 /* Error occurred during transmission? */
460 if ((ecc & ECC_DIR) == 0)
461 cf->data[2] |= CAN_ERR_PROT_TX;
462 }
463 if (isrc & IRQ_EPI) {
464 /* error passive interrupt */
465 netdev_dbg(dev, "error passive interrupt\n");
466
467 if (state == CAN_STATE_ERROR_PASSIVE)
468 state = CAN_STATE_ERROR_WARNING;
469 else
470 state = CAN_STATE_ERROR_PASSIVE;
471 }
472 if (isrc & IRQ_ALI) {
473 /* arbitration lost interrupt */
474 netdev_dbg(dev, "arbitration lost interrupt\n");
475 alc = priv->read_reg(priv, SJA1000_ALC);
476 priv->can.can_stats.arbitration_lost++;
477 stats->tx_errors++;
478 cf->can_id |= CAN_ERR_LOSTARB;
479 cf->data[0] = alc & 0x1f;
480 }
481
482 if (state != priv->can.state) {
483 tx_state = txerr >= rxerr ? state : 0;
484 rx_state = txerr <= rxerr ? state : 0;
485
486 can_change_state(dev, cf, tx_state, rx_state);
487
488 if(state == CAN_STATE_BUS_OFF)
489 can_bus_off(dev);
490 }
491
492 stats->rx_packets++;
493 stats->rx_bytes += cf->can_dlc;
494 netif_rx(skb);
495
496 return 0;
497}
498
499irqreturn_t sja1000_interrupt(int irq, void *dev_id)
500{
501 struct net_device *dev = (struct net_device *)dev_id;
502 struct sja1000_priv *priv = netdev_priv(dev);
503 struct net_device_stats *stats = &dev->stats;
504 uint8_t isrc, status;
505 int n = 0;
506
507 if (priv->pre_irq)
508 priv->pre_irq(priv);
509
510 /* Shared interrupts and IRQ off? */
511 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
512 goto out;
513
514 while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
515 (n < SJA1000_MAX_IRQ)) {
516
517 status = priv->read_reg(priv, SJA1000_SR);
518 /* check for absent controller due to hw unplug */
519 if (status == 0xFF && sja1000_is_absent(priv))
520 goto out;
521
522 if (isrc & IRQ_WUI)
523 netdev_warn(dev, "wakeup interrupt\n");
524
525 if (isrc & IRQ_TI) {
526 /* transmission buffer released */
527 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
528 !(status & SR_TCS)) {
529 stats->tx_errors++;
530 can_free_echo_skb(dev, 0);
531 } else {
532 /* transmission complete */
533 stats->tx_bytes +=
534 priv->read_reg(priv, SJA1000_FI) & 0xf;
535 stats->tx_packets++;
536 can_get_echo_skb(dev, 0);
537 }
538 netif_wake_queue(dev);
539 can_led_event(dev, CAN_LED_EVENT_TX);
540 }
541 if (isrc & IRQ_RI) {
542 /* receive interrupt */
543 while (status & SR_RBS) {
544 sja1000_rx(dev);
545 status = priv->read_reg(priv, SJA1000_SR);
546 /* check for absent controller */
547 if (status == 0xFF && sja1000_is_absent(priv))
548 goto out;
549 }
550 }
551 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
552 /* error interrupt */
553 if (sja1000_err(dev, isrc, status))
554 break;
555 }
556 n++;
557 }
558out:
559 if (priv->post_irq)
560 priv->post_irq(priv);
561
562 if (n >= SJA1000_MAX_IRQ)
563 netdev_dbg(dev, "%d messages handled in ISR", n);
564
565 return (n) ? IRQ_HANDLED : IRQ_NONE;
566}
567EXPORT_SYMBOL_GPL(sja1000_interrupt);
568
569static int sja1000_open(struct net_device *dev)
570{
571 struct sja1000_priv *priv = netdev_priv(dev);
572 int err;
573
574 /* set chip into reset mode */
575 set_reset_mode(dev);
576
577 /* common open */
578 err = open_candev(dev);
579 if (err)
580 return err;
581
582 /* register interrupt handler, if not done by the device driver */
583 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
584 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
585 dev->name, (void *)dev);
586 if (err) {
587 close_candev(dev);
588 return -EAGAIN;
589 }
590 }
591
592 /* init and start chi */
593 sja1000_start(dev);
594
595 can_led_event(dev, CAN_LED_EVENT_OPEN);
596
597 netif_start_queue(dev);
598
599 return 0;
600}
601
602static int sja1000_close(struct net_device *dev)
603{
604 struct sja1000_priv *priv = netdev_priv(dev);
605
606 netif_stop_queue(dev);
607 set_reset_mode(dev);
608
609 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
610 free_irq(dev->irq, (void *)dev);
611
612 close_candev(dev);
613
614 can_led_event(dev, CAN_LED_EVENT_STOP);
615
616 return 0;
617}
618
619struct net_device *alloc_sja1000dev(int sizeof_priv)
620{
621 struct net_device *dev;
622 struct sja1000_priv *priv;
623
624 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
625 SJA1000_ECHO_SKB_MAX);
626 if (!dev)
627 return NULL;
628
629 priv = netdev_priv(dev);
630
631 priv->dev = dev;
632 priv->can.bittiming_const = &sja1000_bittiming_const;
633 priv->can.do_set_bittiming = sja1000_set_bittiming;
634 priv->can.do_set_mode = sja1000_set_mode;
635 priv->can.do_get_berr_counter = sja1000_get_berr_counter;
636 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
637 CAN_CTRLMODE_LISTENONLY |
638 CAN_CTRLMODE_3_SAMPLES |
639 CAN_CTRLMODE_ONE_SHOT |
640 CAN_CTRLMODE_BERR_REPORTING |
641 CAN_CTRLMODE_PRESUME_ACK;
642
643 spin_lock_init(&priv->cmdreg_lock);
644
645 if (sizeof_priv)
646 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
647
648 return dev;
649}
650EXPORT_SYMBOL_GPL(alloc_sja1000dev);
651
652void free_sja1000dev(struct net_device *dev)
653{
654 free_candev(dev);
655}
656EXPORT_SYMBOL_GPL(free_sja1000dev);
657
658static const struct net_device_ops sja1000_netdev_ops = {
659 .ndo_open = sja1000_open,
660 .ndo_stop = sja1000_close,
661 .ndo_start_xmit = sja1000_start_xmit,
662 .ndo_change_mtu = can_change_mtu,
663};
664
665int register_sja1000dev(struct net_device *dev)
666{
667 int ret;
668
669 if (!sja1000_probe_chip(dev))
670 return -ENODEV;
671
672 dev->flags |= IFF_ECHO; /* we support local echo */
673 dev->netdev_ops = &sja1000_netdev_ops;
674
675 set_reset_mode(dev);
676 chipset_init(dev);
677
678 ret = register_candev(dev);
679
680 if (!ret)
681 devm_can_led_init(dev);
682
683 return ret;
684}
685EXPORT_SYMBOL_GPL(register_sja1000dev);
686
687void unregister_sja1000dev(struct net_device *dev)
688{
689 set_reset_mode(dev);
690 unregister_candev(dev);
691}
692EXPORT_SYMBOL_GPL(unregister_sja1000dev);
693
694static __init int sja1000_init(void)
695{
696 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
697
698 return 0;
699}
700
701module_init(sja1000_init);
702
703static __exit void sja1000_exit(void)
704{
705 printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
706}
707
708module_exit(sja1000_exit);
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 * Send feedback to <socketcan-users@lists.berlios.de>
44 *
45 */
46
47#include <linux/module.h>
48#include <linux/init.h>
49#include <linux/kernel.h>
50#include <linux/sched.h>
51#include <linux/types.h>
52#include <linux/fcntl.h>
53#include <linux/interrupt.h>
54#include <linux/ptrace.h>
55#include <linux/string.h>
56#include <linux/errno.h>
57#include <linux/netdevice.h>
58#include <linux/if_arp.h>
59#include <linux/if_ether.h>
60#include <linux/skbuff.h>
61#include <linux/delay.h>
62
63#include <linux/can/dev.h>
64#include <linux/can/error.h>
65
66#include "sja1000.h"
67
68#define DRV_NAME "sja1000"
69
70MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
71MODULE_LICENSE("Dual BSD/GPL");
72MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
73
74static struct can_bittiming_const sja1000_bittiming_const = {
75 .name = DRV_NAME,
76 .tseg1_min = 1,
77 .tseg1_max = 16,
78 .tseg2_min = 1,
79 .tseg2_max = 8,
80 .sjw_max = 4,
81 .brp_min = 1,
82 .brp_max = 64,
83 .brp_inc = 1,
84};
85
86static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
87{
88 unsigned long flags;
89
90 /*
91 * The command register needs some locking and time to settle
92 * the write_reg() operation - especially on SMP systems.
93 */
94 spin_lock_irqsave(&priv->cmdreg_lock, flags);
95 priv->write_reg(priv, REG_CMR, val);
96 priv->read_reg(priv, REG_SR);
97 spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
98}
99
100static int sja1000_probe_chip(struct net_device *dev)
101{
102 struct sja1000_priv *priv = netdev_priv(dev);
103
104 if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
105 printk(KERN_INFO "%s: probing @0x%lX failed\n",
106 DRV_NAME, dev->base_addr);
107 return 0;
108 }
109 return -1;
110}
111
112static void set_reset_mode(struct net_device *dev)
113{
114 struct sja1000_priv *priv = netdev_priv(dev);
115 unsigned char status = priv->read_reg(priv, REG_MOD);
116 int i;
117
118 /* disable interrupts */
119 priv->write_reg(priv, REG_IER, IRQ_OFF);
120
121 for (i = 0; i < 100; i++) {
122 /* check reset bit */
123 if (status & MOD_RM) {
124 priv->can.state = CAN_STATE_STOPPED;
125 return;
126 }
127
128 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
129 udelay(10);
130 status = priv->read_reg(priv, REG_MOD);
131 }
132
133 dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
134}
135
136static void set_normal_mode(struct net_device *dev)
137{
138 struct sja1000_priv *priv = netdev_priv(dev);
139 unsigned char status = priv->read_reg(priv, REG_MOD);
140 int i;
141
142 for (i = 0; i < 100; i++) {
143 /* check reset bit */
144 if ((status & MOD_RM) == 0) {
145 priv->can.state = CAN_STATE_ERROR_ACTIVE;
146 /* enable interrupts */
147 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
148 priv->write_reg(priv, REG_IER, IRQ_ALL);
149 else
150 priv->write_reg(priv, REG_IER,
151 IRQ_ALL & ~IRQ_BEI);
152 return;
153 }
154
155 /* set chip to normal mode */
156 priv->write_reg(priv, REG_MOD, 0x00);
157 udelay(10);
158 status = priv->read_reg(priv, REG_MOD);
159 }
160
161 dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
162}
163
164static void sja1000_start(struct net_device *dev)
165{
166 struct sja1000_priv *priv = netdev_priv(dev);
167
168 /* leave reset mode */
169 if (priv->can.state != CAN_STATE_STOPPED)
170 set_reset_mode(dev);
171
172 /* Clear error counters and error code capture */
173 priv->write_reg(priv, REG_TXERR, 0x0);
174 priv->write_reg(priv, REG_RXERR, 0x0);
175 priv->read_reg(priv, REG_ECC);
176
177 /* leave reset mode */
178 set_normal_mode(dev);
179}
180
181static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
182{
183 struct sja1000_priv *priv = netdev_priv(dev);
184
185 if (!priv->open_time)
186 return -EINVAL;
187
188 switch (mode) {
189 case CAN_MODE_START:
190 sja1000_start(dev);
191 if (netif_queue_stopped(dev))
192 netif_wake_queue(dev);
193 break;
194
195 default:
196 return -EOPNOTSUPP;
197 }
198
199 return 0;
200}
201
202static int sja1000_set_bittiming(struct net_device *dev)
203{
204 struct sja1000_priv *priv = netdev_priv(dev);
205 struct can_bittiming *bt = &priv->can.bittiming;
206 u8 btr0, btr1;
207
208 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
209 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
210 (((bt->phase_seg2 - 1) & 0x7) << 4);
211 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
212 btr1 |= 0x80;
213
214 dev_info(dev->dev.parent,
215 "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
216
217 priv->write_reg(priv, REG_BTR0, btr0);
218 priv->write_reg(priv, REG_BTR1, btr1);
219
220 return 0;
221}
222
223static int sja1000_get_berr_counter(const struct net_device *dev,
224 struct can_berr_counter *bec)
225{
226 struct sja1000_priv *priv = netdev_priv(dev);
227
228 bec->txerr = priv->read_reg(priv, REG_TXERR);
229 bec->rxerr = priv->read_reg(priv, REG_RXERR);
230
231 return 0;
232}
233
234/*
235 * initialize SJA1000 chip:
236 * - reset chip
237 * - set output mode
238 * - set baudrate
239 * - enable interrupts
240 * - start operating mode
241 */
242static void chipset_init(struct net_device *dev)
243{
244 struct sja1000_priv *priv = netdev_priv(dev);
245
246 /* set clock divider and output control register */
247 priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
248
249 /* set acceptance filter (accept all) */
250 priv->write_reg(priv, REG_ACCC0, 0x00);
251 priv->write_reg(priv, REG_ACCC1, 0x00);
252 priv->write_reg(priv, REG_ACCC2, 0x00);
253 priv->write_reg(priv, REG_ACCC3, 0x00);
254
255 priv->write_reg(priv, REG_ACCM0, 0xFF);
256 priv->write_reg(priv, REG_ACCM1, 0xFF);
257 priv->write_reg(priv, REG_ACCM2, 0xFF);
258 priv->write_reg(priv, REG_ACCM3, 0xFF);
259
260 priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
261}
262
263/*
264 * transmit a CAN message
265 * message layout in the sk_buff should be like this:
266 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77
267 * [ can-id ] [flags] [len] [can data (up to 8 bytes]
268 */
269static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
270 struct net_device *dev)
271{
272 struct sja1000_priv *priv = netdev_priv(dev);
273 struct can_frame *cf = (struct can_frame *)skb->data;
274 uint8_t fi;
275 uint8_t dlc;
276 canid_t id;
277 uint8_t dreg;
278 int i;
279
280 if (can_dropped_invalid_skb(dev, skb))
281 return NETDEV_TX_OK;
282
283 netif_stop_queue(dev);
284
285 fi = dlc = cf->can_dlc;
286 id = cf->can_id;
287
288 if (id & CAN_RTR_FLAG)
289 fi |= FI_RTR;
290
291 if (id & CAN_EFF_FLAG) {
292 fi |= FI_FF;
293 dreg = EFF_BUF;
294 priv->write_reg(priv, REG_FI, fi);
295 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
296 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
297 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
298 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
299 } else {
300 dreg = SFF_BUF;
301 priv->write_reg(priv, REG_FI, fi);
302 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
303 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
304 }
305
306 for (i = 0; i < dlc; i++)
307 priv->write_reg(priv, dreg++, cf->data[i]);
308
309 can_put_echo_skb(skb, dev, 0);
310
311 sja1000_write_cmdreg(priv, CMD_TR);
312
313 return NETDEV_TX_OK;
314}
315
316static void sja1000_rx(struct net_device *dev)
317{
318 struct sja1000_priv *priv = netdev_priv(dev);
319 struct net_device_stats *stats = &dev->stats;
320 struct can_frame *cf;
321 struct sk_buff *skb;
322 uint8_t fi;
323 uint8_t dreg;
324 canid_t id;
325 int i;
326
327 /* create zero'ed CAN frame buffer */
328 skb = alloc_can_skb(dev, &cf);
329 if (skb == NULL)
330 return;
331
332 fi = priv->read_reg(priv, REG_FI);
333
334 if (fi & FI_FF) {
335 /* extended frame format (EFF) */
336 dreg = EFF_BUF;
337 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
338 | (priv->read_reg(priv, REG_ID2) << (5 + 8))
339 | (priv->read_reg(priv, REG_ID3) << 5)
340 | (priv->read_reg(priv, REG_ID4) >> 3);
341 id |= CAN_EFF_FLAG;
342 } else {
343 /* standard frame format (SFF) */
344 dreg = SFF_BUF;
345 id = (priv->read_reg(priv, REG_ID1) << 3)
346 | (priv->read_reg(priv, REG_ID2) >> 5);
347 }
348
349 cf->can_dlc = get_can_dlc(fi & 0x0F);
350 if (fi & FI_RTR) {
351 id |= CAN_RTR_FLAG;
352 } else {
353 for (i = 0; i < cf->can_dlc; i++)
354 cf->data[i] = priv->read_reg(priv, dreg++);
355 }
356
357 cf->can_id = id;
358
359 /* release receive buffer */
360 sja1000_write_cmdreg(priv, CMD_RRB);
361
362 netif_rx(skb);
363
364 stats->rx_packets++;
365 stats->rx_bytes += cf->can_dlc;
366}
367
368static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
369{
370 struct sja1000_priv *priv = netdev_priv(dev);
371 struct net_device_stats *stats = &dev->stats;
372 struct can_frame *cf;
373 struct sk_buff *skb;
374 enum can_state state = priv->can.state;
375 uint8_t ecc, alc;
376
377 skb = alloc_can_err_skb(dev, &cf);
378 if (skb == NULL)
379 return -ENOMEM;
380
381 if (isrc & IRQ_DOI) {
382 /* data overrun interrupt */
383 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
384 cf->can_id |= CAN_ERR_CRTL;
385 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
386 stats->rx_over_errors++;
387 stats->rx_errors++;
388 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
389 }
390
391 if (isrc & IRQ_EI) {
392 /* error warning interrupt */
393 dev_dbg(dev->dev.parent, "error warning interrupt\n");
394
395 if (status & SR_BS) {
396 state = CAN_STATE_BUS_OFF;
397 cf->can_id |= CAN_ERR_BUSOFF;
398 can_bus_off(dev);
399 } else if (status & SR_ES) {
400 state = CAN_STATE_ERROR_WARNING;
401 } else
402 state = CAN_STATE_ERROR_ACTIVE;
403 }
404 if (isrc & IRQ_BEI) {
405 /* bus error interrupt */
406 priv->can.can_stats.bus_error++;
407 stats->rx_errors++;
408
409 ecc = priv->read_reg(priv, REG_ECC);
410
411 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
412
413 switch (ecc & ECC_MASK) {
414 case ECC_BIT:
415 cf->data[2] |= CAN_ERR_PROT_BIT;
416 break;
417 case ECC_FORM:
418 cf->data[2] |= CAN_ERR_PROT_FORM;
419 break;
420 case ECC_STUFF:
421 cf->data[2] |= CAN_ERR_PROT_STUFF;
422 break;
423 default:
424 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
425 cf->data[3] = ecc & ECC_SEG;
426 break;
427 }
428 /* Error occurred during transmission? */
429 if ((ecc & ECC_DIR) == 0)
430 cf->data[2] |= CAN_ERR_PROT_TX;
431 }
432 if (isrc & IRQ_EPI) {
433 /* error passive interrupt */
434 dev_dbg(dev->dev.parent, "error passive interrupt\n");
435 if (status & SR_ES)
436 state = CAN_STATE_ERROR_PASSIVE;
437 else
438 state = CAN_STATE_ERROR_ACTIVE;
439 }
440 if (isrc & IRQ_ALI) {
441 /* arbitration lost interrupt */
442 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
443 alc = priv->read_reg(priv, REG_ALC);
444 priv->can.can_stats.arbitration_lost++;
445 stats->tx_errors++;
446 cf->can_id |= CAN_ERR_LOSTARB;
447 cf->data[0] = alc & 0x1f;
448 }
449
450 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
451 state == CAN_STATE_ERROR_PASSIVE)) {
452 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
453 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
454 cf->can_id |= CAN_ERR_CRTL;
455 if (state == CAN_STATE_ERROR_WARNING) {
456 priv->can.can_stats.error_warning++;
457 cf->data[1] = (txerr > rxerr) ?
458 CAN_ERR_CRTL_TX_WARNING :
459 CAN_ERR_CRTL_RX_WARNING;
460 } else {
461 priv->can.can_stats.error_passive++;
462 cf->data[1] = (txerr > rxerr) ?
463 CAN_ERR_CRTL_TX_PASSIVE :
464 CAN_ERR_CRTL_RX_PASSIVE;
465 }
466 cf->data[6] = txerr;
467 cf->data[7] = rxerr;
468 }
469
470 priv->can.state = state;
471
472 netif_rx(skb);
473
474 stats->rx_packets++;
475 stats->rx_bytes += cf->can_dlc;
476
477 return 0;
478}
479
480irqreturn_t sja1000_interrupt(int irq, void *dev_id)
481{
482 struct net_device *dev = (struct net_device *)dev_id;
483 struct sja1000_priv *priv = netdev_priv(dev);
484 struct net_device_stats *stats = &dev->stats;
485 uint8_t isrc, status;
486 int n = 0;
487
488 /* Shared interrupts and IRQ off? */
489 if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
490 return IRQ_NONE;
491
492 if (priv->pre_irq)
493 priv->pre_irq(priv);
494
495 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
496 n++;
497 status = priv->read_reg(priv, REG_SR);
498
499 if (isrc & IRQ_WUI)
500 dev_warn(dev->dev.parent, "wakeup interrupt\n");
501
502 if (isrc & IRQ_TI) {
503 /* transmission complete interrupt */
504 stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
505 stats->tx_packets++;
506 can_get_echo_skb(dev, 0);
507 netif_wake_queue(dev);
508 }
509 if (isrc & IRQ_RI) {
510 /* receive interrupt */
511 while (status & SR_RBS) {
512 sja1000_rx(dev);
513 status = priv->read_reg(priv, REG_SR);
514 }
515 }
516 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
517 /* error interrupt */
518 if (sja1000_err(dev, isrc, status))
519 break;
520 }
521 }
522
523 if (priv->post_irq)
524 priv->post_irq(priv);
525
526 if (n >= SJA1000_MAX_IRQ)
527 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
528
529 return (n) ? IRQ_HANDLED : IRQ_NONE;
530}
531EXPORT_SYMBOL_GPL(sja1000_interrupt);
532
533static int sja1000_open(struct net_device *dev)
534{
535 struct sja1000_priv *priv = netdev_priv(dev);
536 int err;
537
538 /* set chip into reset mode */
539 set_reset_mode(dev);
540
541 /* common open */
542 err = open_candev(dev);
543 if (err)
544 return err;
545
546 /* register interrupt handler, if not done by the device driver */
547 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
548 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
549 dev->name, (void *)dev);
550 if (err) {
551 close_candev(dev);
552 return -EAGAIN;
553 }
554 }
555
556 /* init and start chi */
557 sja1000_start(dev);
558 priv->open_time = jiffies;
559
560 netif_start_queue(dev);
561
562 return 0;
563}
564
565static int sja1000_close(struct net_device *dev)
566{
567 struct sja1000_priv *priv = netdev_priv(dev);
568
569 netif_stop_queue(dev);
570 set_reset_mode(dev);
571
572 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
573 free_irq(dev->irq, (void *)dev);
574
575 close_candev(dev);
576
577 priv->open_time = 0;
578
579 return 0;
580}
581
582struct net_device *alloc_sja1000dev(int sizeof_priv)
583{
584 struct net_device *dev;
585 struct sja1000_priv *priv;
586
587 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
588 SJA1000_ECHO_SKB_MAX);
589 if (!dev)
590 return NULL;
591
592 priv = netdev_priv(dev);
593
594 priv->dev = dev;
595 priv->can.bittiming_const = &sja1000_bittiming_const;
596 priv->can.do_set_bittiming = sja1000_set_bittiming;
597 priv->can.do_set_mode = sja1000_set_mode;
598 priv->can.do_get_berr_counter = sja1000_get_berr_counter;
599 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
600 CAN_CTRLMODE_BERR_REPORTING;
601
602 spin_lock_init(&priv->cmdreg_lock);
603
604 if (sizeof_priv)
605 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
606
607 return dev;
608}
609EXPORT_SYMBOL_GPL(alloc_sja1000dev);
610
611void free_sja1000dev(struct net_device *dev)
612{
613 free_candev(dev);
614}
615EXPORT_SYMBOL_GPL(free_sja1000dev);
616
617static const struct net_device_ops sja1000_netdev_ops = {
618 .ndo_open = sja1000_open,
619 .ndo_stop = sja1000_close,
620 .ndo_start_xmit = sja1000_start_xmit,
621};
622
623int register_sja1000dev(struct net_device *dev)
624{
625 if (!sja1000_probe_chip(dev))
626 return -ENODEV;
627
628 dev->flags |= IFF_ECHO; /* we support local echo */
629 dev->netdev_ops = &sja1000_netdev_ops;
630
631 set_reset_mode(dev);
632 chipset_init(dev);
633
634 return register_candev(dev);
635}
636EXPORT_SYMBOL_GPL(register_sja1000dev);
637
638void unregister_sja1000dev(struct net_device *dev)
639{
640 set_reset_mode(dev);
641 unregister_candev(dev);
642}
643EXPORT_SYMBOL_GPL(unregister_sja1000dev);
644
645static __init int sja1000_init(void)
646{
647 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
648
649 return 0;
650}
651
652module_init(sja1000_init);
653
654static __exit void sja1000_exit(void)
655{
656 printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
657}
658
659module_exit(sja1000_exit);