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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#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);