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WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / can / peak_canfd / peak_canfd.c
blobc5334b0c3038f937e8cc70726af55dd49ebaec26
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
3 * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
4 *
5 * Copyright (C) 2016 PEAK System-Technik GmbH
6 */
7
8 #include <linux/can.h>
9 #include <linux/can/dev.h>
10
11 #include "peak_canfd_user.h"
12
13 /* internal IP core cache size (used as default echo skbs max number) */
14 #define PCANFD_ECHO_SKB_MAX 24
15
16 /* bittiming ranges of the PEAK-System PC CAN-FD interfaces */
17 static const struct can_bittiming_const peak_canfd_nominal_const = {
18 .name = "peak_canfd",
19 .tseg1_min = 1,
20 .tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS),
21 .tseg2_min = 1,
22 .tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS),
23 .sjw_max = (1 << PUCAN_TSLOW_SJW_BITS),
24 .brp_min = 1,
25 .brp_max = (1 << PUCAN_TSLOW_BRP_BITS),
26 .brp_inc = 1,
27 };
28
29 static const struct can_bittiming_const peak_canfd_data_const = {
30 .name = "peak_canfd",
31 .tseg1_min = 1,
32 .tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS),
33 .tseg2_min = 1,
34 .tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS),
35 .sjw_max = (1 << PUCAN_TFAST_SJW_BITS),
36 .brp_min = 1,
37 .brp_max = (1 << PUCAN_TFAST_BRP_BITS),
38 .brp_inc = 1,
39 };
40
41 static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
42 {
43 priv->cmd_len = 0;
44 return priv;
45 }
46
47 static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op)
48 {
49 struct pucan_command *cmd;
50
51 if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen)
52 return NULL;
53
54 cmd = priv->cmd_buffer + priv->cmd_len;
55
56 /* reset all unused bit to default */
57 memset(cmd, 0, sizeof(*cmd));
58
59 cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op);
60 priv->cmd_len += sizeof(*cmd);
61
62 return cmd;
63 }
64
65 static int pucan_write_cmd(struct peak_canfd_priv *priv)
66 {
67 int err;
68
69 if (priv->pre_cmd) {
70 err = priv->pre_cmd(priv);
71 if (err)
72 return err;
73 }
74
75 err = priv->write_cmd(priv);
76 if (err)
77 return err;
78
79 if (priv->post_cmd)
80 err = priv->post_cmd(priv);
81
82 return err;
83 }
84
85 /* uCAN commands interface functions */
86 static int pucan_set_reset_mode(struct peak_canfd_priv *priv)
87 {
88 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE);
89 return pucan_write_cmd(priv);
90 }
91
92 static int pucan_set_normal_mode(struct peak_canfd_priv *priv)
93 {
94 int err;
95
96 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE);
97 err = pucan_write_cmd(priv);
98 if (!err)
99 priv->can.state = CAN_STATE_ERROR_ACTIVE;
100
101 return err;
102 }
103
104 static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv)
105 {
106 int err;
107
108 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE);
109 err = pucan_write_cmd(priv);
110 if (!err)
111 priv->can.state = CAN_STATE_ERROR_ACTIVE;
112
113 return err;
114 }
115
116 static int pucan_set_timing_slow(struct peak_canfd_priv *priv,
117 const struct can_bittiming *pbt)
118 {
119 struct pucan_timing_slow *cmd;
120
121 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW);
122
123 cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1,
124 priv->can.ctrlmode &
125 CAN_CTRLMODE_3_SAMPLES);
126 cmd->tseg1 = PUCAN_TSLOW_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
127 cmd->tseg2 = PUCAN_TSLOW_TSEG2(pbt->phase_seg2 - 1);
128 cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(pbt->brp - 1));
129
130 cmd->ewl = 96; /* default */
131
132 netdev_dbg(priv->ndev,
133 "nominal: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
134 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw_t);
135
136 return pucan_write_cmd(priv);
137 }
138
139 static int pucan_set_timing_fast(struct peak_canfd_priv *priv,
140 const struct can_bittiming *pbt)
141 {
142 struct pucan_timing_fast *cmd;
143
144 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST);
145
146 cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1);
147 cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
148 cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1);
149 cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1));
150
151 netdev_dbg(priv->ndev,
152 "data: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
153 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw);
154
155 return pucan_write_cmd(priv);
156 }
157
158 static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask)
159 {
160 struct pucan_std_filter *cmd;
161
162 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER);
163
164 /* all the 11-bits CAN ID values are represented by one bit in a
165 * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the
166 * row while the lowest 5 bits select the bit in that row.
167 *
168 * bit filter
169 * 1 passed
170 * 0 discarded
171 */
172
173 /* select the row */
174 cmd->idx = row;
175
176 /* set/unset bits in the row */
177 cmd->mask = cpu_to_le32(mask);
178
179 return pucan_write_cmd(priv);
180 }
181
182 static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags)
183 {
184 struct pucan_tx_abort *cmd;
185
186 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT);
187
188 cmd->flags = cpu_to_le16(flags);
189
190 return pucan_write_cmd(priv);
191 }
192
193 static int pucan_clr_err_counters(struct peak_canfd_priv *priv)
194 {
195 struct pucan_wr_err_cnt *cmd;
196
197 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT);
198
199 cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE);
200 cmd->tx_counter = 0;
201 cmd->rx_counter = 0;
202
203 return pucan_write_cmd(priv);
204 }
205
206 static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask)
207 {
208 struct pucan_options *cmd;
209
210 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION);
211
212 cmd->options = cpu_to_le16(opt_mask);
213
214 return pucan_write_cmd(priv);
215 }
216
217 static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask)
218 {
219 struct pucan_options *cmd;
220
221 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION);
222
223 cmd->options = cpu_to_le16(opt_mask);
224
225 return pucan_write_cmd(priv);
226 }
227
228 static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv)
229 {
230 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER);
231
232 return pucan_write_cmd(priv);
233 }
234
235 static int pucan_netif_rx(struct sk_buff *skb, __le32 ts_low, __le32 ts_high)
236 {
237 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
238 u64 ts_us;
239
240 ts_us = (u64)le32_to_cpu(ts_high) << 32;
241 ts_us |= le32_to_cpu(ts_low);
242
243 /* IP core timestamps are µs. */
244 hwts->hwtstamp = ns_to_ktime(ts_us * NSEC_PER_USEC);
245
246 return netif_rx(skb);
247 }
248
249 /* handle the reception of one CAN frame */
250 static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
251 struct pucan_rx_msg *msg)
252 {
253 struct net_device_stats *stats = &priv->ndev->stats;
254 struct canfd_frame *cf;
255 struct sk_buff *skb;
256 const u16 rx_msg_flags = le16_to_cpu(msg->flags);
257 u8 cf_len;
258
259 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
260 cf_len = can_fd_dlc2len(pucan_msg_get_dlc(msg));
261 else
262 cf_len = can_cc_dlc2len(pucan_msg_get_dlc(msg));
263
264 /* if this frame is an echo, */
265 if (rx_msg_flags & PUCAN_MSG_LOOPED_BACK) {
266 unsigned long flags;
267
268 spin_lock_irqsave(&priv->echo_lock, flags);
269 can_get_echo_skb(priv->ndev, msg->client);
270
271 /* count bytes of the echo instead of skb */
272 stats->tx_bytes += cf_len;
273 stats->tx_packets++;
274
275 /* restart tx queue (a slot is free) */
276 netif_wake_queue(priv->ndev);
277
278 spin_unlock_irqrestore(&priv->echo_lock, flags);
279
280 /* if this frame is only an echo, stop here. Otherwise,
281 * continue to push this application self-received frame into
282 * its own rx queue.
283 */
284 if (!(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE))
285 return 0;
286 }
287
288 /* otherwise, it should be pushed into rx fifo */
289 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
290 /* CANFD frame case */
291 skb = alloc_canfd_skb(priv->ndev, &cf);
292 if (!skb)
293 return -ENOMEM;
294
295 if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
296 cf->flags |= CANFD_BRS;
297
298 if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
299 cf->flags |= CANFD_ESI;
300 } else {
301 /* CAN 2.0 frame case */
302 skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
303 if (!skb)
304 return -ENOMEM;
305 }
306
307 cf->can_id = le32_to_cpu(msg->can_id);
308 cf->len = cf_len;
309
310 if (rx_msg_flags & PUCAN_MSG_EXT_ID)
311 cf->can_id |= CAN_EFF_FLAG;
312
313 if (rx_msg_flags & PUCAN_MSG_RTR)
314 cf->can_id |= CAN_RTR_FLAG;
315 else
316 memcpy(cf->data, msg->d, cf->len);
317
318 stats->rx_bytes += cf->len;
319 stats->rx_packets++;
320
321 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
322
323 return 0;
324 }
325
326 /* handle rx/tx error counters notification */
327 static int pucan_handle_error(struct peak_canfd_priv *priv,
328 struct pucan_error_msg *msg)
329 {
330 priv->bec.txerr = msg->tx_err_cnt;
331 priv->bec.rxerr = msg->rx_err_cnt;
332
333 return 0;
334 }
335
336 /* handle status notification */
337 static int pucan_handle_status(struct peak_canfd_priv *priv,
338 struct pucan_status_msg *msg)
339 {
340 struct net_device *ndev = priv->ndev;
341 struct net_device_stats *stats = &ndev->stats;
342 struct can_frame *cf;
343 struct sk_buff *skb;
344
345 /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
346 if (pucan_status_is_rx_barrier(msg)) {
347 if (priv->enable_tx_path) {
348 int err = priv->enable_tx_path(priv);
349
350 if (err)
351 return err;
352 }
353
354 /* start network queue (echo_skb array is empty) */
355 netif_start_queue(ndev);
356
357 return 0;
358 }
359
360 skb = alloc_can_err_skb(ndev, &cf);
361
362 /* test state error bits according to their priority */
363 if (pucan_status_is_busoff(msg)) {
364 netdev_dbg(ndev, "Bus-off entry status\n");
365 priv->can.state = CAN_STATE_BUS_OFF;
366 priv->can.can_stats.bus_off++;
367 can_bus_off(ndev);
368 if (skb)
369 cf->can_id |= CAN_ERR_BUSOFF;
370
371 } else if (pucan_status_is_passive(msg)) {
372 netdev_dbg(ndev, "Error passive status\n");
373 priv->can.state = CAN_STATE_ERROR_PASSIVE;
374 priv->can.can_stats.error_passive++;
375 if (skb) {
376 cf->can_id |= CAN_ERR_CRTL;
377 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
378 CAN_ERR_CRTL_TX_PASSIVE :
379 CAN_ERR_CRTL_RX_PASSIVE;
380 cf->data[6] = priv->bec.txerr;
381 cf->data[7] = priv->bec.rxerr;
382 }
383
384 } else if (pucan_status_is_warning(msg)) {
385 netdev_dbg(ndev, "Error warning status\n");
386 priv->can.state = CAN_STATE_ERROR_WARNING;
387 priv->can.can_stats.error_warning++;
388 if (skb) {
389 cf->can_id |= CAN_ERR_CRTL;
390 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
391 CAN_ERR_CRTL_TX_WARNING :
392 CAN_ERR_CRTL_RX_WARNING;
393 cf->data[6] = priv->bec.txerr;
394 cf->data[7] = priv->bec.rxerr;
395 }
396
397 } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
398 /* back to ERROR_ACTIVE */
399 netdev_dbg(ndev, "Error active status\n");
400 can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
401 CAN_STATE_ERROR_ACTIVE);
402 } else {
403 dev_kfree_skb(skb);
404 return 0;
405 }
406
407 if (!skb) {
408 stats->rx_dropped++;
409 return -ENOMEM;
410 }
411
412 stats->rx_packets++;
413 stats->rx_bytes += cf->len;
414 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
415
416 return 0;
417 }
418
419 /* handle uCAN Rx overflow notification */
420 static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
421 {
422 struct net_device_stats *stats = &priv->ndev->stats;
423 struct can_frame *cf;
424 struct sk_buff *skb;
425
426 stats->rx_over_errors++;
427 stats->rx_errors++;
428
429 skb = alloc_can_err_skb(priv->ndev, &cf);
430 if (!skb) {
431 stats->rx_dropped++;
432 return -ENOMEM;
433 }
434
435 cf->can_id |= CAN_ERR_CRTL;
436 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
437
438 cf->data[6] = priv->bec.txerr;
439 cf->data[7] = priv->bec.rxerr;
440
441 stats->rx_bytes += cf->len;
442 stats->rx_packets++;
443 netif_rx(skb);
444
445 return 0;
446 }
447
448 /* handle a single uCAN message */
449 int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
450 struct pucan_rx_msg *msg)
451 {
452 u16 msg_type = le16_to_cpu(msg->type);
453 int msg_size = le16_to_cpu(msg->size);
454 int err;
455
456 if (!msg_size || !msg_type) {
457 /* null packet found: end of list */
458 goto exit;
459 }
460
461 switch (msg_type) {
462 case PUCAN_MSG_CAN_RX:
463 err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
464 break;
465 case PUCAN_MSG_ERROR:
466 err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
467 break;
468 case PUCAN_MSG_STATUS:
469 err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
470 break;
471 case PUCAN_MSG_CACHE_CRITICAL:
472 err = pucan_handle_cache_critical(priv);
473 break;
474 default:
475 err = 0;
476 }
477
478 if (err < 0)
479 return err;
480
481 exit:
482 return msg_size;
483 }
484
485 /* handle a list of rx_count messages from rx_msg memory address */
486 int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
487 struct pucan_rx_msg *msg_list, int msg_count)
488 {
489 void *msg_ptr = msg_list;
490 int i, msg_size = 0;
491
492 for (i = 0; i < msg_count; i++) {
493 msg_size = peak_canfd_handle_msg(priv, msg_ptr);
494
495 /* a null packet can be found at the end of a list */
496 if (msg_size <= 0)
497 break;
498
499 msg_ptr += ALIGN(msg_size, 4);
500 }
501
502 if (msg_size < 0)
503 return msg_size;
504
505 return i;
506 }
507
508 static int peak_canfd_start(struct peak_canfd_priv *priv)
509 {
510 int err;
511
512 err = pucan_clr_err_counters(priv);
513 if (err)
514 goto err_exit;
515
516 priv->echo_idx = 0;
517
518 priv->bec.txerr = 0;
519 priv->bec.rxerr = 0;
520
521 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
522 err = pucan_set_listen_only_mode(priv);
523 else
524 err = pucan_set_normal_mode(priv);
525
526 err_exit:
527 return err;
528 }
529
530 static void peak_canfd_stop(struct peak_canfd_priv *priv)
531 {
532 int err;
533
534 /* go back to RESET mode */
535 err = pucan_set_reset_mode(priv);
536 if (err) {
537 netdev_err(priv->ndev, "channel %u reset failed\n",
538 priv->index);
539 } else {
540 /* abort last Tx (MUST be done in RESET mode only!) */
541 pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH);
542 }
543 }
544
545 static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
546 {
547 struct peak_canfd_priv *priv = netdev_priv(ndev);
548
549 switch (mode) {
550 case CAN_MODE_START:
551 peak_canfd_start(priv);
552 netif_wake_queue(ndev);
553 break;
554 default:
555 return -EOPNOTSUPP;
556 }
557
558 return 0;
559 }
560
561 static int peak_canfd_get_berr_counter(const struct net_device *ndev,
562 struct can_berr_counter *bec)
563 {
564 struct peak_canfd_priv *priv = netdev_priv(ndev);
565
566 *bec = priv->bec;
567 return 0;
568 }
569
570 static int peak_canfd_open(struct net_device *ndev)
571 {
572 struct peak_canfd_priv *priv = netdev_priv(ndev);
573 int i, err = 0;
574
575 err = open_candev(ndev);
576 if (err) {
577 netdev_err(ndev, "open_candev() failed, error %d\n", err);
578 goto err_exit;
579 }
580
581 err = pucan_set_reset_mode(priv);
582 if (err)
583 goto err_close;
584
585 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
586 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
587 err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO);
588 else
589 err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO);
590
591 if (err)
592 goto err_close;
593 }
594
595 /* set option: get rx/tx error counters */
596 err = pucan_set_options(priv, PUCAN_OPTION_ERROR);
597 if (err)
598 goto err_close;
599
600 /* accept all standard CAN ID */
601 for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++)
602 pucan_set_std_filter(priv, i, 0xffffffff);
603
604 err = peak_canfd_start(priv);
605 if (err)
606 goto err_close;
607
608 /* receiving the RB status says when Tx path is ready */
609 err = pucan_setup_rx_barrier(priv);
610 if (!err)
611 goto err_exit;
612
613 err_close:
614 close_candev(ndev);
615 err_exit:
616 return err;
617 }
618
619 static int peak_canfd_set_bittiming(struct net_device *ndev)
620 {
621 struct peak_canfd_priv *priv = netdev_priv(ndev);
622
623 return pucan_set_timing_slow(priv, &priv->can.bittiming);
624 }
625
626 static int peak_canfd_set_data_bittiming(struct net_device *ndev)
627 {
628 struct peak_canfd_priv *priv = netdev_priv(ndev);
629
630 return pucan_set_timing_fast(priv, &priv->can.data_bittiming);
631 }
632
633 static int peak_canfd_close(struct net_device *ndev)
634 {
635 struct peak_canfd_priv *priv = netdev_priv(ndev);
636
637 netif_stop_queue(ndev);
638 peak_canfd_stop(priv);
639 close_candev(ndev);
640
641 return 0;
642 }
643
644 static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
645 struct net_device *ndev)
646 {
647 struct peak_canfd_priv *priv = netdev_priv(ndev);
648 struct net_device_stats *stats = &ndev->stats;
649 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
650 struct pucan_tx_msg *msg;
651 u16 msg_size, msg_flags;
652 unsigned long flags;
653 bool should_stop_tx_queue;
654 int room_left;
655 u8 len;
656
657 if (can_dropped_invalid_skb(ndev, skb))
658 return NETDEV_TX_OK;
659
660 msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
661 msg = priv->alloc_tx_msg(priv, msg_size, &room_left);
662
663 /* should never happen except under bus-off condition and (auto-)restart
664 * mechanism
665 */
666 if (!msg) {
667 stats->tx_dropped++;
668 netif_stop_queue(ndev);
669 return NETDEV_TX_BUSY;
670 }
671
672 msg->size = cpu_to_le16(msg_size);
673 msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
674 msg_flags = 0;
675
676 if (cf->can_id & CAN_EFF_FLAG) {
677 msg_flags |= PUCAN_MSG_EXT_ID;
678 msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK);
679 } else {
680 msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
681 }
682
683 if (can_is_canfd_skb(skb)) {
684 /* CAN FD frame format */
685 len = can_fd_len2dlc(cf->len);
686
687 msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
688
689 if (cf->flags & CANFD_BRS)
690 msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
691
692 if (cf->flags & CANFD_ESI)
693 msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
694 } else {
695 /* CAN 2.0 frame format */
696 len = cf->len;
697
698 if (cf->can_id & CAN_RTR_FLAG)
699 msg_flags |= PUCAN_MSG_RTR;
700 }
701
702 /* always ask loopback for echo management */
703 msg_flags |= PUCAN_MSG_LOOPED_BACK;
704
705 /* set driver specific bit to differentiate with application loopback */
706 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
707 msg_flags |= PUCAN_MSG_SELF_RECEIVE;
708
709 msg->flags = cpu_to_le16(msg_flags);
710 msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, len);
711 memcpy(msg->d, cf->data, cf->len);
712
713 /* struct msg client field is used as an index in the echo skbs ring */
714 msg->client = priv->echo_idx;
715
716 spin_lock_irqsave(&priv->echo_lock, flags);
717
718 /* prepare and save echo skb in internal slot */
719 can_put_echo_skb(skb, ndev, priv->echo_idx);
720
721 /* move echo index to the next slot */
722 priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max;
723
724 /* if next slot is not free, stop network queue (no slot free in echo
725 * skb ring means that the controller did not write these frames on
726 * the bus: no need to continue).
727 */
728 should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]);
729
730 /* stop network tx queue if not enough room to save one more msg too */
731 if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
732 should_stop_tx_queue |= (room_left <
733 (sizeof(*msg) + CANFD_MAX_DLEN));
734 else
735 should_stop_tx_queue |= (room_left <
736 (sizeof(*msg) + CAN_MAX_DLEN));
737
738 if (should_stop_tx_queue)
739 netif_stop_queue(ndev);
740
741 spin_unlock_irqrestore(&priv->echo_lock, flags);
742
743 /* write the skb on the interface */
744 priv->write_tx_msg(priv, msg);
745
746 return NETDEV_TX_OK;
747 }
748
749 static const struct net_device_ops peak_canfd_netdev_ops = {
750 .ndo_open = peak_canfd_open,
751 .ndo_stop = peak_canfd_close,
752 .ndo_start_xmit = peak_canfd_start_xmit,
753 .ndo_change_mtu = can_change_mtu,
754 };
755
756 struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
757 int echo_skb_max)
758 {
759 struct net_device *ndev;
760 struct peak_canfd_priv *priv;
761
762 /* we DO support local echo */
763 if (echo_skb_max < 0)
764 echo_skb_max = PCANFD_ECHO_SKB_MAX;
765
766 /* allocate the candev object */
767 ndev = alloc_candev(sizeof_priv, echo_skb_max);
768 if (!ndev)
769 return NULL;
770
771 priv = netdev_priv(ndev);
772
773 /* complete now socket-can initialization side */
774 priv->can.state = CAN_STATE_STOPPED;
775 priv->can.bittiming_const = &peak_canfd_nominal_const;
776 priv->can.data_bittiming_const = &peak_canfd_data_const;
777
778 priv->can.do_set_mode = peak_canfd_set_mode;
779 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;
780 priv->can.do_set_bittiming = peak_canfd_set_bittiming;
781 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;
782 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
783 CAN_CTRLMODE_LISTENONLY |
784 CAN_CTRLMODE_3_SAMPLES |
785 CAN_CTRLMODE_FD |
786 CAN_CTRLMODE_FD_NON_ISO |
787 CAN_CTRLMODE_BERR_REPORTING;
788
789 priv->ndev = ndev;
790 priv->index = index;
791 priv->cmd_len = 0;
792 spin_lock_init(&priv->echo_lock);
793
794 ndev->flags |= IFF_ECHO;
795 ndev->netdev_ops = &peak_canfd_netdev_ops;
796 ndev->dev_id = index;
797
798 return ndev;
799 }
Linux with added FPC-III support