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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/ethtool.h>
56#include <linux/netdevice.h>
57#include <linux/if_arp.h>
58#include <linux/if_ether.h>
59#include <linux/skbuff.h>
60#include <linux/delay.h>
61
62#include <linux/can/dev.h>
63#include <linux/can/error.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 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG))
188 /* set clock divider and output control register */
189 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
190
191 /* set acceptance filter (accept all) */
192 priv->write_reg(priv, SJA1000_ACCC0, 0x00);
193 priv->write_reg(priv, SJA1000_ACCC1, 0x00);
194 priv->write_reg(priv, SJA1000_ACCC2, 0x00);
195 priv->write_reg(priv, SJA1000_ACCC3, 0x00);
196
197 priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
198 priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
199 priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
200 priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
201
202 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
203}
204
205static void sja1000_start(struct net_device *dev)
206{
207 struct sja1000_priv *priv = netdev_priv(dev);
208
209 /* enter reset mode */
210 if (priv->can.state != CAN_STATE_STOPPED)
211 set_reset_mode(dev);
212
213 /* Initialize chip if uninitialized at this stage */
214 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG ||
215 priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
216 chipset_init(dev);
217
218 /* Clear error counters and error code capture */
219 priv->write_reg(priv, SJA1000_TXERR, 0x0);
220 priv->write_reg(priv, SJA1000_RXERR, 0x0);
221 priv->read_reg(priv, SJA1000_ECC);
222
223 /* clear interrupt flags */
224 priv->read_reg(priv, SJA1000_IR);
225
226 /* leave reset mode */
227 set_normal_mode(dev);
228}
229
230static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
231{
232 switch (mode) {
233 case CAN_MODE_START:
234 sja1000_start(dev);
235 if (netif_queue_stopped(dev))
236 netif_wake_queue(dev);
237 break;
238
239 default:
240 return -EOPNOTSUPP;
241 }
242
243 return 0;
244}
245
246static int sja1000_set_bittiming(struct net_device *dev)
247{
248 struct sja1000_priv *priv = netdev_priv(dev);
249 struct can_bittiming *bt = &priv->can.bittiming;
250 u8 btr0, btr1;
251
252 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
253 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
254 (((bt->phase_seg2 - 1) & 0x7) << 4);
255 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
256 btr1 |= 0x80;
257
258 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
259
260 priv->write_reg(priv, SJA1000_BTR0, btr0);
261 priv->write_reg(priv, SJA1000_BTR1, btr1);
262
263 return 0;
264}
265
266static int sja1000_get_berr_counter(const struct net_device *dev,
267 struct can_berr_counter *bec)
268{
269 struct sja1000_priv *priv = netdev_priv(dev);
270
271 bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
272 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
273
274 return 0;
275}
276
277/*
278 * transmit a CAN message
279 * message layout in the sk_buff should be like this:
280 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77
281 * [ can-id ] [flags] [len] [can data (up to 8 bytes]
282 */
283static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
284 struct net_device *dev)
285{
286 struct sja1000_priv *priv = netdev_priv(dev);
287 struct can_frame *cf = (struct can_frame *)skb->data;
288 uint8_t fi;
289 canid_t id;
290 uint8_t dreg;
291 u8 cmd_reg_val = 0x00;
292 int i;
293
294 if (can_dev_dropped_skb(dev, skb))
295 return NETDEV_TX_OK;
296
297 netif_stop_queue(dev);
298
299 fi = can_get_cc_dlc(cf, priv->can.ctrlmode);
300 id = cf->can_id;
301
302 if (id & CAN_RTR_FLAG)
303 fi |= SJA1000_FI_RTR;
304
305 if (id & CAN_EFF_FLAG) {
306 fi |= SJA1000_FI_FF;
307 dreg = SJA1000_EFF_BUF;
308 priv->write_reg(priv, SJA1000_FI, fi);
309 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
310 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
311 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
312 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
313 } else {
314 dreg = SJA1000_SFF_BUF;
315 priv->write_reg(priv, SJA1000_FI, fi);
316 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
317 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
318 }
319
320 for (i = 0; i < cf->len; i++)
321 priv->write_reg(priv, dreg++, cf->data[i]);
322
323 can_put_echo_skb(skb, dev, 0, 0);
324
325 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
326 cmd_reg_val |= CMD_AT;
327
328 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
329 cmd_reg_val |= CMD_SRR;
330 else
331 cmd_reg_val |= CMD_TR;
332
333 sja1000_write_cmdreg(priv, cmd_reg_val);
334
335 return NETDEV_TX_OK;
336}
337
338static void sja1000_rx(struct net_device *dev)
339{
340 struct sja1000_priv *priv = netdev_priv(dev);
341 struct net_device_stats *stats = &dev->stats;
342 struct can_frame *cf;
343 struct sk_buff *skb;
344 uint8_t fi;
345 uint8_t dreg;
346 canid_t id;
347 int i;
348
349 /* create zero'ed CAN frame buffer */
350 skb = alloc_can_skb(dev, &cf);
351 if (skb == NULL)
352 return;
353
354 fi = priv->read_reg(priv, SJA1000_FI);
355
356 if (fi & SJA1000_FI_FF) {
357 /* extended frame format (EFF) */
358 dreg = SJA1000_EFF_BUF;
359 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
360 | (priv->read_reg(priv, SJA1000_ID2) << 13)
361 | (priv->read_reg(priv, SJA1000_ID3) << 5)
362 | (priv->read_reg(priv, SJA1000_ID4) >> 3);
363 id |= CAN_EFF_FLAG;
364 } else {
365 /* standard frame format (SFF) */
366 dreg = SJA1000_SFF_BUF;
367 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
368 | (priv->read_reg(priv, SJA1000_ID2) >> 5);
369 }
370
371 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode);
372 if (fi & SJA1000_FI_RTR) {
373 id |= CAN_RTR_FLAG;
374 } else {
375 for (i = 0; i < cf->len; i++)
376 cf->data[i] = priv->read_reg(priv, dreg++);
377
378 stats->rx_bytes += cf->len;
379 }
380 stats->rx_packets++;
381
382 cf->can_id = id;
383
384 /* release receive buffer */
385 sja1000_write_cmdreg(priv, CMD_RRB);
386
387 netif_rx(skb);
388}
389
390static irqreturn_t sja1000_reset_interrupt(int irq, void *dev_id)
391{
392 struct net_device *dev = (struct net_device *)dev_id;
393
394 netdev_dbg(dev, "performing a soft reset upon overrun\n");
395
396 netif_tx_lock(dev);
397
398 can_free_echo_skb(dev, 0, NULL);
399 sja1000_set_mode(dev, CAN_MODE_START);
400
401 netif_tx_unlock(dev);
402
403 return IRQ_HANDLED;
404}
405
406static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
407{
408 struct sja1000_priv *priv = netdev_priv(dev);
409 struct net_device_stats *stats = &dev->stats;
410 struct can_frame *cf;
411 struct sk_buff *skb;
412 enum can_state state = priv->can.state;
413 enum can_state rx_state, tx_state;
414 unsigned int rxerr, txerr;
415 uint8_t ecc, alc;
416 int ret = 0;
417
418 skb = alloc_can_err_skb(dev, &cf);
419 if (skb == NULL)
420 return -ENOMEM;
421
422 txerr = priv->read_reg(priv, SJA1000_TXERR);
423 rxerr = priv->read_reg(priv, SJA1000_RXERR);
424
425 if (isrc & IRQ_DOI) {
426 /* data overrun interrupt */
427 netdev_dbg(dev, "data overrun interrupt\n");
428 cf->can_id |= CAN_ERR_CRTL;
429 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
430 stats->rx_over_errors++;
431 stats->rx_errors++;
432 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
433
434 /* Some controllers needs additional handling upon overrun
435 * condition: the controller may sometimes be totally confused
436 * and refuse any new frame while its buffer is empty. The only
437 * way to re-sync the read vs. write buffer offsets is to
438 * stop any current handling and perform a reset.
439 */
440 if (priv->flags & SJA1000_QUIRK_RESET_ON_OVERRUN)
441 ret = IRQ_WAKE_THREAD;
442 }
443
444 if (isrc & IRQ_EI) {
445 /* error warning interrupt */
446 netdev_dbg(dev, "error warning interrupt\n");
447
448 if (status & SR_BS)
449 state = CAN_STATE_BUS_OFF;
450 else if (status & SR_ES)
451 state = CAN_STATE_ERROR_WARNING;
452 else
453 state = CAN_STATE_ERROR_ACTIVE;
454 }
455 if (state != CAN_STATE_BUS_OFF) {
456 cf->can_id |= CAN_ERR_CNT;
457 cf->data[6] = txerr;
458 cf->data[7] = rxerr;
459 }
460 if (isrc & IRQ_BEI) {
461 /* bus error interrupt */
462 priv->can.can_stats.bus_error++;
463 stats->rx_errors++;
464
465 ecc = priv->read_reg(priv, SJA1000_ECC);
466
467 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
468
469 /* set error type */
470 switch (ecc & ECC_MASK) {
471 case ECC_BIT:
472 cf->data[2] |= CAN_ERR_PROT_BIT;
473 break;
474 case ECC_FORM:
475 cf->data[2] |= CAN_ERR_PROT_FORM;
476 break;
477 case ECC_STUFF:
478 cf->data[2] |= CAN_ERR_PROT_STUFF;
479 break;
480 default:
481 break;
482 }
483
484 /* set error location */
485 cf->data[3] = ecc & ECC_SEG;
486
487 /* Error occurred during transmission? */
488 if ((ecc & ECC_DIR) == 0)
489 cf->data[2] |= CAN_ERR_PROT_TX;
490 }
491 if (isrc & IRQ_EPI) {
492 /* error passive interrupt */
493 netdev_dbg(dev, "error passive interrupt\n");
494
495 if (state == CAN_STATE_ERROR_PASSIVE)
496 state = CAN_STATE_ERROR_WARNING;
497 else
498 state = CAN_STATE_ERROR_PASSIVE;
499 }
500 if (isrc & IRQ_ALI) {
501 /* arbitration lost interrupt */
502 netdev_dbg(dev, "arbitration lost interrupt\n");
503 alc = priv->read_reg(priv, SJA1000_ALC);
504 priv->can.can_stats.arbitration_lost++;
505 cf->can_id |= CAN_ERR_LOSTARB;
506 cf->data[0] = alc & 0x1f;
507 }
508
509 if (state != priv->can.state) {
510 tx_state = txerr >= rxerr ? state : 0;
511 rx_state = txerr <= rxerr ? state : 0;
512
513 can_change_state(dev, cf, tx_state, rx_state);
514
515 if(state == CAN_STATE_BUS_OFF)
516 can_bus_off(dev);
517 }
518
519 netif_rx(skb);
520
521 return ret;
522}
523
524irqreturn_t sja1000_interrupt(int irq, void *dev_id)
525{
526 struct net_device *dev = (struct net_device *)dev_id;
527 struct sja1000_priv *priv = netdev_priv(dev);
528 struct net_device_stats *stats = &dev->stats;
529 uint8_t isrc, status;
530 irqreturn_t ret = 0;
531 int n = 0, err;
532
533 if (priv->pre_irq)
534 priv->pre_irq(priv);
535
536 /* Shared interrupts and IRQ off? */
537 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
538 goto out;
539
540 while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
541 (n < SJA1000_MAX_IRQ)) {
542
543 status = priv->read_reg(priv, SJA1000_SR);
544 /* check for absent controller due to hw unplug */
545 if (status == 0xFF && sja1000_is_absent(priv))
546 goto out;
547
548 if (isrc & IRQ_WUI)
549 netdev_warn(dev, "wakeup interrupt\n");
550
551 if (isrc & IRQ_TI) {
552 /* transmission buffer released */
553 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
554 !(status & SR_TCS)) {
555 stats->tx_errors++;
556 can_free_echo_skb(dev, 0, NULL);
557 } else {
558 /* transmission complete */
559 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
560 stats->tx_packets++;
561 }
562 netif_wake_queue(dev);
563 }
564 if (isrc & IRQ_RI) {
565 /* receive interrupt */
566 while (status & SR_RBS) {
567 sja1000_rx(dev);
568 status = priv->read_reg(priv, SJA1000_SR);
569 /* check for absent controller */
570 if (status == 0xFF && sja1000_is_absent(priv))
571 goto out;
572 }
573 }
574 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
575 /* error interrupt */
576 err = sja1000_err(dev, isrc, status);
577 if (err == IRQ_WAKE_THREAD)
578 ret = err;
579 if (err)
580 break;
581 }
582 n++;
583 }
584out:
585 if (!ret)
586 ret = (n) ? IRQ_HANDLED : IRQ_NONE;
587
588 if (priv->post_irq)
589 priv->post_irq(priv);
590
591 if (n >= SJA1000_MAX_IRQ)
592 netdev_dbg(dev, "%d messages handled in ISR", n);
593
594 return ret;
595}
596EXPORT_SYMBOL_GPL(sja1000_interrupt);
597
598static int sja1000_open(struct net_device *dev)
599{
600 struct sja1000_priv *priv = netdev_priv(dev);
601 int err;
602
603 /* set chip into reset mode */
604 set_reset_mode(dev);
605
606 /* common open */
607 err = open_candev(dev);
608 if (err)
609 return err;
610
611 /* register interrupt handler, if not done by the device driver */
612 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
613 err = request_threaded_irq(dev->irq, sja1000_interrupt,
614 sja1000_reset_interrupt,
615 priv->irq_flags, dev->name, (void *)dev);
616 if (err) {
617 close_candev(dev);
618 return -EAGAIN;
619 }
620 }
621
622 /* init and start chi */
623 sja1000_start(dev);
624
625 netif_start_queue(dev);
626
627 return 0;
628}
629
630static int sja1000_close(struct net_device *dev)
631{
632 struct sja1000_priv *priv = netdev_priv(dev);
633
634 netif_stop_queue(dev);
635 set_reset_mode(dev);
636
637 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
638 free_irq(dev->irq, (void *)dev);
639
640 close_candev(dev);
641
642 return 0;
643}
644
645struct net_device *alloc_sja1000dev(int sizeof_priv)
646{
647 struct net_device *dev;
648 struct sja1000_priv *priv;
649
650 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
651 SJA1000_ECHO_SKB_MAX);
652 if (!dev)
653 return NULL;
654
655 priv = netdev_priv(dev);
656
657 priv->dev = dev;
658 priv->can.bittiming_const = &sja1000_bittiming_const;
659 priv->can.do_set_bittiming = sja1000_set_bittiming;
660 priv->can.do_set_mode = sja1000_set_mode;
661 priv->can.do_get_berr_counter = sja1000_get_berr_counter;
662 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
663 CAN_CTRLMODE_LISTENONLY |
664 CAN_CTRLMODE_3_SAMPLES |
665 CAN_CTRLMODE_ONE_SHOT |
666 CAN_CTRLMODE_BERR_REPORTING |
667 CAN_CTRLMODE_PRESUME_ACK |
668 CAN_CTRLMODE_CC_LEN8_DLC;
669
670 spin_lock_init(&priv->cmdreg_lock);
671
672 if (sizeof_priv)
673 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
674
675 return dev;
676}
677EXPORT_SYMBOL_GPL(alloc_sja1000dev);
678
679void free_sja1000dev(struct net_device *dev)
680{
681 free_candev(dev);
682}
683EXPORT_SYMBOL_GPL(free_sja1000dev);
684
685static const struct net_device_ops sja1000_netdev_ops = {
686 .ndo_open = sja1000_open,
687 .ndo_stop = sja1000_close,
688 .ndo_start_xmit = sja1000_start_xmit,
689 .ndo_change_mtu = can_change_mtu,
690};
691
692static const struct ethtool_ops sja1000_ethtool_ops = {
693 .get_ts_info = ethtool_op_get_ts_info,
694};
695
696int register_sja1000dev(struct net_device *dev)
697{
698 if (!sja1000_probe_chip(dev))
699 return -ENODEV;
700
701 dev->flags |= IFF_ECHO; /* we support local echo */
702 dev->netdev_ops = &sja1000_netdev_ops;
703 dev->ethtool_ops = &sja1000_ethtool_ops;
704
705 set_reset_mode(dev);
706 chipset_init(dev);
707
708 return register_candev(dev);
709}
710EXPORT_SYMBOL_GPL(register_sja1000dev);
711
712void unregister_sja1000dev(struct net_device *dev)
713{
714 set_reset_mode(dev);
715 unregister_candev(dev);
716}
717EXPORT_SYMBOL_GPL(unregister_sja1000dev);
718
719static __init int sja1000_init(void)
720{
721 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
722
723 return 0;
724}
725
726module_init(sja1000_init);
727
728static __exit void sja1000_exit(void)
729{
730 printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
731}
732
733module_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 */
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
68MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
69MODULE_LICENSE("Dual BSD/GPL");
70MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
71
72static 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
84static 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, REG_CMR, val);
94 priv->read_reg(priv, REG_SR);
95 spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
96}
97
98static int sja1000_is_absent(struct sja1000_priv *priv)
99{
100 return (priv->read_reg(priv, REG_MOD) == 0xFF);
101}
102
103static 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 printk(KERN_INFO "%s: probing @0x%lX failed\n",
109 DRV_NAME, dev->base_addr);
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, REG_MOD);
119 int i;
120
121 /* disable interrupts */
122 priv->write_reg(priv, REG_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 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
132 udelay(10);
133 status = priv->read_reg(priv, REG_MOD);
134 }
135
136 netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
137}
138
139static 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, REG_MOD);
143 int i;
144
145 for (i = 0; i < 100; i++) {
146 /* check reset bit */
147 if ((status & MOD_RM) == 0) {
148 priv->can.state = CAN_STATE_ERROR_ACTIVE;
149 /* enable interrupts */
150 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
151 priv->write_reg(priv, REG_IER, IRQ_ALL);
152 else
153 priv->write_reg(priv, REG_IER,
154 IRQ_ALL & ~IRQ_BEI);
155 return;
156 }
157
158 /* set chip to normal mode */
159 priv->write_reg(priv, REG_MOD, 0x00);
160 udelay(10);
161 status = priv->read_reg(priv, REG_MOD);
162 }
163
164 netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
165}
166
167static void sja1000_start(struct net_device *dev)
168{
169 struct sja1000_priv *priv = netdev_priv(dev);
170
171 /* leave reset mode */
172 if (priv->can.state != CAN_STATE_STOPPED)
173 set_reset_mode(dev);
174
175 /* Clear error counters and error code capture */
176 priv->write_reg(priv, REG_TXERR, 0x0);
177 priv->write_reg(priv, REG_RXERR, 0x0);
178 priv->read_reg(priv, REG_ECC);
179
180 /* leave reset mode */
181 set_normal_mode(dev);
182}
183
184static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
185{
186 struct sja1000_priv *priv = netdev_priv(dev);
187
188 if (!priv->open_time)
189 return -EINVAL;
190
191 switch (mode) {
192 case CAN_MODE_START:
193 sja1000_start(dev);
194 if (netif_queue_stopped(dev))
195 netif_wake_queue(dev);
196 break;
197
198 default:
199 return -EOPNOTSUPP;
200 }
201
202 return 0;
203}
204
205static int sja1000_set_bittiming(struct net_device *dev)
206{
207 struct sja1000_priv *priv = netdev_priv(dev);
208 struct can_bittiming *bt = &priv->can.bittiming;
209 u8 btr0, btr1;
210
211 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
212 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
213 (((bt->phase_seg2 - 1) & 0x7) << 4);
214 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
215 btr1 |= 0x80;
216
217 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
218
219 priv->write_reg(priv, REG_BTR0, btr0);
220 priv->write_reg(priv, REG_BTR1, btr1);
221
222 return 0;
223}
224
225static int sja1000_get_berr_counter(const struct net_device *dev,
226 struct can_berr_counter *bec)
227{
228 struct sja1000_priv *priv = netdev_priv(dev);
229
230 bec->txerr = priv->read_reg(priv, REG_TXERR);
231 bec->rxerr = priv->read_reg(priv, REG_RXERR);
232
233 return 0;
234}
235
236/*
237 * initialize SJA1000 chip:
238 * - reset chip
239 * - set output mode
240 * - set baudrate
241 * - enable interrupts
242 * - start operating mode
243 */
244static void chipset_init(struct net_device *dev)
245{
246 struct sja1000_priv *priv = netdev_priv(dev);
247
248 /* set clock divider and output control register */
249 priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
250
251 /* set acceptance filter (accept all) */
252 priv->write_reg(priv, REG_ACCC0, 0x00);
253 priv->write_reg(priv, REG_ACCC1, 0x00);
254 priv->write_reg(priv, REG_ACCC2, 0x00);
255 priv->write_reg(priv, REG_ACCC3, 0x00);
256
257 priv->write_reg(priv, REG_ACCM0, 0xFF);
258 priv->write_reg(priv, REG_ACCM1, 0xFF);
259 priv->write_reg(priv, REG_ACCM2, 0xFF);
260 priv->write_reg(priv, REG_ACCM3, 0xFF);
261
262 priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
263}
264
265/*
266 * transmit a CAN message
267 * message layout in the sk_buff should be like this:
268 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77
269 * [ can-id ] [flags] [len] [can data (up to 8 bytes]
270 */
271static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
272 struct net_device *dev)
273{
274 struct sja1000_priv *priv = netdev_priv(dev);
275 struct can_frame *cf = (struct can_frame *)skb->data;
276 uint8_t fi;
277 uint8_t dlc;
278 canid_t id;
279 uint8_t dreg;
280 int i;
281
282 if (can_dropped_invalid_skb(dev, skb))
283 return NETDEV_TX_OK;
284
285 netif_stop_queue(dev);
286
287 fi = dlc = cf->can_dlc;
288 id = cf->can_id;
289
290 if (id & CAN_RTR_FLAG)
291 fi |= FI_RTR;
292
293 if (id & CAN_EFF_FLAG) {
294 fi |= FI_FF;
295 dreg = EFF_BUF;
296 priv->write_reg(priv, REG_FI, fi);
297 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
298 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
299 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
300 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
301 } else {
302 dreg = SFF_BUF;
303 priv->write_reg(priv, REG_FI, fi);
304 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
305 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
306 }
307
308 for (i = 0; i < dlc; i++)
309 priv->write_reg(priv, dreg++, cf->data[i]);
310
311 can_put_echo_skb(skb, dev, 0);
312
313 sja1000_write_cmdreg(priv, CMD_TR);
314
315 return NETDEV_TX_OK;
316}
317
318static void sja1000_rx(struct net_device *dev)
319{
320 struct sja1000_priv *priv = netdev_priv(dev);
321 struct net_device_stats *stats = &dev->stats;
322 struct can_frame *cf;
323 struct sk_buff *skb;
324 uint8_t fi;
325 uint8_t dreg;
326 canid_t id;
327 int i;
328
329 /* create zero'ed CAN frame buffer */
330 skb = alloc_can_skb(dev, &cf);
331 if (skb == NULL)
332 return;
333
334 fi = priv->read_reg(priv, REG_FI);
335
336 if (fi & FI_FF) {
337 /* extended frame format (EFF) */
338 dreg = EFF_BUF;
339 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
340 | (priv->read_reg(priv, REG_ID2) << (5 + 8))
341 | (priv->read_reg(priv, REG_ID3) << 5)
342 | (priv->read_reg(priv, REG_ID4) >> 3);
343 id |= CAN_EFF_FLAG;
344 } else {
345 /* standard frame format (SFF) */
346 dreg = SFF_BUF;
347 id = (priv->read_reg(priv, REG_ID1) << 3)
348 | (priv->read_reg(priv, REG_ID2) >> 5);
349 }
350
351 cf->can_dlc = get_can_dlc(fi & 0x0F);
352 if (fi & FI_RTR) {
353 id |= CAN_RTR_FLAG;
354 } else {
355 for (i = 0; i < cf->can_dlc; i++)
356 cf->data[i] = priv->read_reg(priv, dreg++);
357 }
358
359 cf->can_id = id;
360
361 /* release receive buffer */
362 sja1000_write_cmdreg(priv, CMD_RRB);
363
364 netif_rx(skb);
365
366 stats->rx_packets++;
367 stats->rx_bytes += cf->can_dlc;
368}
369
370static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
371{
372 struct sja1000_priv *priv = netdev_priv(dev);
373 struct net_device_stats *stats = &dev->stats;
374 struct can_frame *cf;
375 struct sk_buff *skb;
376 enum can_state state = priv->can.state;
377 uint8_t ecc, alc;
378
379 skb = alloc_can_err_skb(dev, &cf);
380 if (skb == NULL)
381 return -ENOMEM;
382
383 if (isrc & IRQ_DOI) {
384 /* data overrun interrupt */
385 netdev_dbg(dev, "data overrun interrupt\n");
386 cf->can_id |= CAN_ERR_CRTL;
387 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
388 stats->rx_over_errors++;
389 stats->rx_errors++;
390 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */
391 }
392
393 if (isrc & IRQ_EI) {
394 /* error warning interrupt */
395 netdev_dbg(dev, "error warning interrupt\n");
396
397 if (status & SR_BS) {
398 state = CAN_STATE_BUS_OFF;
399 cf->can_id |= CAN_ERR_BUSOFF;
400 can_bus_off(dev);
401 } else if (status & SR_ES) {
402 state = CAN_STATE_ERROR_WARNING;
403 } else
404 state = CAN_STATE_ERROR_ACTIVE;
405 }
406 if (isrc & IRQ_BEI) {
407 /* bus error interrupt */
408 priv->can.can_stats.bus_error++;
409 stats->rx_errors++;
410
411 ecc = priv->read_reg(priv, REG_ECC);
412
413 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
414
415 switch (ecc & ECC_MASK) {
416 case ECC_BIT:
417 cf->data[2] |= CAN_ERR_PROT_BIT;
418 break;
419 case ECC_FORM:
420 cf->data[2] |= CAN_ERR_PROT_FORM;
421 break;
422 case ECC_STUFF:
423 cf->data[2] |= CAN_ERR_PROT_STUFF;
424 break;
425 default:
426 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
427 cf->data[3] = ecc & ECC_SEG;
428 break;
429 }
430 /* Error occurred during transmission? */
431 if ((ecc & ECC_DIR) == 0)
432 cf->data[2] |= CAN_ERR_PROT_TX;
433 }
434 if (isrc & IRQ_EPI) {
435 /* error passive interrupt */
436 netdev_dbg(dev, "error passive interrupt\n");
437 if (status & SR_ES)
438 state = CAN_STATE_ERROR_PASSIVE;
439 else
440 state = CAN_STATE_ERROR_ACTIVE;
441 }
442 if (isrc & IRQ_ALI) {
443 /* arbitration lost interrupt */
444 netdev_dbg(dev, "arbitration lost interrupt\n");
445 alc = priv->read_reg(priv, REG_ALC);
446 priv->can.can_stats.arbitration_lost++;
447 stats->tx_errors++;
448 cf->can_id |= CAN_ERR_LOSTARB;
449 cf->data[0] = alc & 0x1f;
450 }
451
452 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
453 state == CAN_STATE_ERROR_PASSIVE)) {
454 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
455 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
456 cf->can_id |= CAN_ERR_CRTL;
457 if (state == CAN_STATE_ERROR_WARNING) {
458 priv->can.can_stats.error_warning++;
459 cf->data[1] = (txerr > rxerr) ?
460 CAN_ERR_CRTL_TX_WARNING :
461 CAN_ERR_CRTL_RX_WARNING;
462 } else {
463 priv->can.can_stats.error_passive++;
464 cf->data[1] = (txerr > rxerr) ?
465 CAN_ERR_CRTL_TX_PASSIVE :
466 CAN_ERR_CRTL_RX_PASSIVE;
467 }
468 cf->data[6] = txerr;
469 cf->data[7] = rxerr;
470 }
471
472 priv->can.state = state;
473
474 netif_rx(skb);
475
476 stats->rx_packets++;
477 stats->rx_bytes += cf->can_dlc;
478
479 return 0;
480}
481
482irqreturn_t sja1000_interrupt(int irq, void *dev_id)
483{
484 struct net_device *dev = (struct net_device *)dev_id;
485 struct sja1000_priv *priv = netdev_priv(dev);
486 struct net_device_stats *stats = &dev->stats;
487 uint8_t isrc, status;
488 int n = 0;
489
490 /* Shared interrupts and IRQ off? */
491 if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
492 return IRQ_NONE;
493
494 if (priv->pre_irq)
495 priv->pre_irq(priv);
496
497 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
498 n++;
499 status = priv->read_reg(priv, REG_SR);
500 /* check for absent controller due to hw unplug */
501 if (status == 0xFF && sja1000_is_absent(priv))
502 return IRQ_NONE;
503
504 if (isrc & IRQ_WUI)
505 netdev_warn(dev, "wakeup interrupt\n");
506
507 if (isrc & IRQ_TI) {
508 /* transmission complete interrupt */
509 stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
510 stats->tx_packets++;
511 can_get_echo_skb(dev, 0);
512 netif_wake_queue(dev);
513 }
514 if (isrc & IRQ_RI) {
515 /* receive interrupt */
516 while (status & SR_RBS) {
517 sja1000_rx(dev);
518 status = priv->read_reg(priv, REG_SR);
519 /* check for absent controller */
520 if (status == 0xFF && sja1000_is_absent(priv))
521 return IRQ_NONE;
522 }
523 }
524 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
525 /* error interrupt */
526 if (sja1000_err(dev, isrc, status))
527 break;
528 }
529 }
530
531 if (priv->post_irq)
532 priv->post_irq(priv);
533
534 if (n >= SJA1000_MAX_IRQ)
535 netdev_dbg(dev, "%d messages handled in ISR", n);
536
537 return (n) ? IRQ_HANDLED : IRQ_NONE;
538}
539EXPORT_SYMBOL_GPL(sja1000_interrupt);
540
541static int sja1000_open(struct net_device *dev)
542{
543 struct sja1000_priv *priv = netdev_priv(dev);
544 int err;
545
546 /* set chip into reset mode */
547 set_reset_mode(dev);
548
549 /* common open */
550 err = open_candev(dev);
551 if (err)
552 return err;
553
554 /* register interrupt handler, if not done by the device driver */
555 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
556 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
557 dev->name, (void *)dev);
558 if (err) {
559 close_candev(dev);
560 return -EAGAIN;
561 }
562 }
563
564 /* init and start chi */
565 sja1000_start(dev);
566 priv->open_time = jiffies;
567
568 netif_start_queue(dev);
569
570 return 0;
571}
572
573static int sja1000_close(struct net_device *dev)
574{
575 struct sja1000_priv *priv = netdev_priv(dev);
576
577 netif_stop_queue(dev);
578 set_reset_mode(dev);
579
580 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
581 free_irq(dev->irq, (void *)dev);
582
583 close_candev(dev);
584
585 priv->open_time = 0;
586
587 return 0;
588}
589
590struct net_device *alloc_sja1000dev(int sizeof_priv)
591{
592 struct net_device *dev;
593 struct sja1000_priv *priv;
594
595 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
596 SJA1000_ECHO_SKB_MAX);
597 if (!dev)
598 return NULL;
599
600 priv = netdev_priv(dev);
601
602 priv->dev = dev;
603 priv->can.bittiming_const = &sja1000_bittiming_const;
604 priv->can.do_set_bittiming = sja1000_set_bittiming;
605 priv->can.do_set_mode = sja1000_set_mode;
606 priv->can.do_get_berr_counter = sja1000_get_berr_counter;
607 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
608 CAN_CTRLMODE_BERR_REPORTING;
609
610 spin_lock_init(&priv->cmdreg_lock);
611
612 if (sizeof_priv)
613 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
614
615 return dev;
616}
617EXPORT_SYMBOL_GPL(alloc_sja1000dev);
618
619void free_sja1000dev(struct net_device *dev)
620{
621 free_candev(dev);
622}
623EXPORT_SYMBOL_GPL(free_sja1000dev);
624
625static const struct net_device_ops sja1000_netdev_ops = {
626 .ndo_open = sja1000_open,
627 .ndo_stop = sja1000_close,
628 .ndo_start_xmit = sja1000_start_xmit,
629};
630
631int register_sja1000dev(struct net_device *dev)
632{
633 if (!sja1000_probe_chip(dev))
634 return -ENODEV;
635
636 dev->flags |= IFF_ECHO; /* we support local echo */
637 dev->netdev_ops = &sja1000_netdev_ops;
638
639 set_reset_mode(dev);
640 chipset_init(dev);
641
642 return register_candev(dev);
643}
644EXPORT_SYMBOL_GPL(register_sja1000dev);
645
646void unregister_sja1000dev(struct net_device *dev)
647{
648 set_reset_mode(dev);
649 unregister_candev(dev);
650}
651EXPORT_SYMBOL_GPL(unregister_sja1000dev);
652
653static __init int sja1000_init(void)
654{
655 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
656
657 return 0;
658}
659
660module_init(sja1000_init);
661
662static __exit void sja1000_exit(void)
663{
664 printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
665}
666
667module_exit(sja1000_exit);