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 | |
69 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>" ); |
70 | MODULE_LICENSE("Dual BSD/GPL" ); |
71 | MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver" ); |
72 | |
73 | static 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 | |
85 | static 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(lock: &priv->cmdreg_lock, flags); |
97 | } |
98 | |
99 | static int sja1000_is_absent(struct sja1000_priv *priv) |
100 | { |
101 | return (priv->read_reg(priv, SJA1000_MOD) == 0xFF); |
102 | } |
103 | |
104 | static 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, format: "probing failed\n" ); |
110 | return 0; |
111 | } |
112 | return -1; |
113 | } |
114 | |
115 | static 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, format: "setting SJA1000 into reset mode failed!\n" ); |
138 | } |
139 | |
140 | static 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, format: "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 | */ |
183 | static 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 | |
205 | static 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 | |
230 | static 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 | |
246 | static 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, format: "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 | |
266 | static 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 | */ |
283 | static 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, ctrlmode: 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, idx: 0, frame_len: 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, val: cmd_reg_val); |
334 | |
335 | return NETDEV_TX_OK; |
336 | } |
337 | |
338 | static 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: &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, dlc: fi & 0x0F, ctrlmode: 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 | |
390 | static 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, idx: 0, NULL); |
399 | sja1000_set_mode(dev, mode: CAN_MODE_START); |
400 | |
401 | netif_tx_unlock(dev); |
402 | |
403 | return IRQ_HANDLED; |
404 | } |
405 | |
406 | static 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: &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 | |
524 | irqreturn_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, format: "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, idx: 0, NULL); |
557 | } else { |
558 | /* transmission complete */ |
559 | stats->tx_bytes += can_get_echo_skb(dev, idx: 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 | } |
584 | out: |
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 | } |
596 | EXPORT_SYMBOL_GPL(sja1000_interrupt); |
597 | |
598 | static 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(irq: dev->irq, handler: sja1000_interrupt, |
614 | thread_fn: sja1000_reset_interrupt, |
615 | flags: priv->irq_flags, name: dev->name, dev: (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 | |
630 | static 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 | |
645 | struct 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 | } |
677 | EXPORT_SYMBOL_GPL(alloc_sja1000dev); |
678 | |
679 | void free_sja1000dev(struct net_device *dev) |
680 | { |
681 | free_candev(dev); |
682 | } |
683 | EXPORT_SYMBOL_GPL(free_sja1000dev); |
684 | |
685 | static 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 | |
692 | static const struct ethtool_ops sja1000_ethtool_ops = { |
693 | .get_ts_info = ethtool_op_get_ts_info, |
694 | }; |
695 | |
696 | int 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 | } |
710 | EXPORT_SYMBOL_GPL(register_sja1000dev); |
711 | |
712 | void unregister_sja1000dev(struct net_device *dev) |
713 | { |
714 | set_reset_mode(dev); |
715 | unregister_candev(dev); |
716 | } |
717 | EXPORT_SYMBOL_GPL(unregister_sja1000dev); |
718 | |
719 | static __init int sja1000_init(void) |
720 | { |
721 | printk(KERN_INFO "%s CAN netdevice driver\n" , DRV_NAME); |
722 | |
723 | return 0; |
724 | } |
725 | |
726 | module_init(sja1000_init); |
727 | |
728 | static __exit void sja1000_exit(void) |
729 | { |
730 | printk(KERN_INFO "%s: driver removed\n" , DRV_NAME); |
731 | } |
732 | |
733 | module_exit(sja1000_exit); |
734 | |