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[linux-block.git] / drivers / net / can / peak_canfd / peak_canfd.c
CommitLineData
8ac8321e
SG		 1/*
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 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the version 2 of the GNU General Public License
9 * as published by the Free Software Foundation
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/can.h>
18#include <linux/can/dev.h>
19
20#include "peak_canfd_user.h"
21
22/* internal IP core cache size (used as default echo skbs max number) */
23#define PCANFD_ECHO_SKB_MAX 24
24
25/* bittiming ranges of the PEAK-System PC CAN-FD interfaces */
26static const struct can_bittiming_const peak_canfd_nominal_const = {
27 .name = "peak_canfd",
28 .tseg1_min = 1,
29 .tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS),
30 .tseg2_min = 1,
31 .tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS),
32 .sjw_max = (1 << PUCAN_TSLOW_SJW_BITS),
33 .brp_min = 1,
34 .brp_max = (1 << PUCAN_TSLOW_BRP_BITS),
35 .brp_inc = 1,
36};
37
38static const struct can_bittiming_const peak_canfd_data_const = {
39 .name = "peak_canfd",
40 .tseg1_min = 1,
41 .tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS),
42 .tseg2_min = 1,
43 .tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS),
44 .sjw_max = (1 << PUCAN_TFAST_SJW_BITS),
45 .brp_min = 1,
46 .brp_max = (1 << PUCAN_TFAST_BRP_BITS),
47 .brp_inc = 1,
48};
49
50static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
51{
52 priv->cmd_len = 0;
53 return priv;
54}
55
56static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op)
57{
58 struct pucan_command *cmd;
59
60 if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen)
61 return NULL;
62
63 cmd = priv->cmd_buffer + priv->cmd_len;
64
65 /* reset all unused bit to default */
66 memset(cmd, 0, sizeof(*cmd));
67
68 cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op);
69 priv->cmd_len += sizeof(*cmd);
70
71 return cmd;
72}
73
74static int pucan_write_cmd(struct peak_canfd_priv *priv)
75{
76 int err;
77
78 if (priv->pre_cmd) {
79 err = priv->pre_cmd(priv);
80 if (err)
81 return err;
82 }
83
84 err = priv->write_cmd(priv);
85 if (err)
86 return err;
87
88 if (priv->post_cmd)
89 err = priv->post_cmd(priv);
90
91 return err;
92}
93
94/* uCAN commands interface functions */
95static int pucan_set_reset_mode(struct peak_canfd_priv *priv)
96{
97 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE);
98 return pucan_write_cmd(priv);
99}
100
101static int pucan_set_normal_mode(struct peak_canfd_priv *priv)
102{
103 int err;
104
105 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE);
106 err = pucan_write_cmd(priv);
107 if (!err)
108 priv->can.state = CAN_STATE_ERROR_ACTIVE;
109
110 return err;
111}
112
113static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv)
114{
115 int err;
116
117 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE);
118 err = pucan_write_cmd(priv);
119 if (!err)
120 priv->can.state = CAN_STATE_ERROR_ACTIVE;
121
122 return err;
123}
124
125static int pucan_set_timing_slow(struct peak_canfd_priv *priv,
126 const struct can_bittiming *pbt)
127{
128 struct pucan_timing_slow *cmd;
129
130 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW);
131
132 cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1,
133 priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES);
134 cmd->tseg1 = PUCAN_TSLOW_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
135 cmd->tseg2 = PUCAN_TSLOW_TSEG2(pbt->phase_seg2 - 1);
136 cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(pbt->brp - 1));
137
138 cmd->ewl = 96; /* default */
139
140 netdev_dbg(priv->ndev,
141 "nominal: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
142 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw_t);
143
144 return pucan_write_cmd(priv);
145}
146
147static int pucan_set_timing_fast(struct peak_canfd_priv *priv,
148 const struct can_bittiming *pbt)
149{
150 struct pucan_timing_fast *cmd;
151
152 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST);
153
154 cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1);
155 cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
156 cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1);
157 cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1));
158
159 netdev_dbg(priv->ndev,
160 "data: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
161 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw);
162
163 return pucan_write_cmd(priv);
164}
165
166static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask)
167{
168 struct pucan_std_filter *cmd;
169
170 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER);
171
172 /* all the 11-bits CAN ID values are represented by one bit in a
173 * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the
174 * row while the lowest 5 bits select the bit in that row.
175 *
176 * bit filter
177 * 1 passed
178 * 0 discarded
179 */
180
181 /* select the row */
182 cmd->idx = row;
183
184 /* set/unset bits in the row */
185 cmd->mask = cpu_to_le32(mask);
186
187 return pucan_write_cmd(priv);
188}
189
190static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags)
191{
192 struct pucan_tx_abort *cmd;
193
194 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT);
195
196 cmd->flags = cpu_to_le16(flags);
197
198 return pucan_write_cmd(priv);
199}
200
201static int pucan_clr_err_counters(struct peak_canfd_priv *priv)
202{
203 struct pucan_wr_err_cnt *cmd;
204
205 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT);
206
207 cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE);
208 cmd->tx_counter = 0;
209 cmd->rx_counter = 0;
210
211 return pucan_write_cmd(priv);
212}
213
214static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask)
215{
216 struct pucan_options *cmd;
217
218 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION);
219
220 cmd->options = cpu_to_le16(opt_mask);
221
222 return pucan_write_cmd(priv);
223}
224
225static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask)
226{
227 struct pucan_options *cmd;
228
229 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION);
230
231 cmd->options = cpu_to_le16(opt_mask);
232
233 return pucan_write_cmd(priv);
234}
235
236static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv)
237{
238 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER);
239
240 return pucan_write_cmd(priv);
241}
242
243/* handle the reception of one CAN frame */
244static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
245 struct pucan_rx_msg *msg)
246{
247 struct net_device_stats *stats = &priv->ndev->stats;
248 struct canfd_frame *cf;
249 struct sk_buff *skb;
250 const u16 rx_msg_flags = le16_to_cpu(msg->flags);
251 u8 cf_len;
252
253 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
254 cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
255 else
256 cf_len = get_can_dlc(pucan_msg_get_dlc(msg));
257
258 /* if this frame is an echo, */
259 if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) &&
260 !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) {
8ac8321e
SG		 261 unsigned long flags;
262
263 spin_lock_irqsave(&priv->echo_lock, flags);
91785de6 264 can_get_echo_skb(priv->ndev, msg->client);
8ac8321e
SG		 265
266 /* count bytes of the echo instead of skb */
267 stats->tx_bytes += cf_len;
268 stats->tx_packets++;
269
91785de6
SG		 270 /* restart tx queue (a slot is free) */
271 netif_wake_queue(priv->ndev);
8ac8321e 272
e6048a00 273 spin_unlock_irqrestore(&priv->echo_lock, flags);
8ac8321e
SG		 274 return 0;
275 }
276
277 /* otherwise, it should be pushed into rx fifo */
278 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
279 /* CANFD frame case */
280 skb = alloc_canfd_skb(priv->ndev, &cf);
281 if (!skb)
282 return -ENOMEM;
283
284 if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
285 cf->flags |= CANFD_BRS;
286
287 if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
288 cf->flags |= CANFD_ESI;
289 } else {
290 /* CAN 2.0 frame case */
291 skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
292 if (!skb)
293 return -ENOMEM;
294 }
295
296 cf->can_id = le32_to_cpu(msg->can_id);
297 cf->len = cf_len;
298
299 if (rx_msg_flags & PUCAN_MSG_EXT_ID)
300 cf->can_id |= CAN_EFF_FLAG;
301
302 if (rx_msg_flags & PUCAN_MSG_RTR)
303 cf->can_id |= CAN_RTR_FLAG;
304 else
305 memcpy(cf->data, msg->d, cf->len);
306
307 stats->rx_bytes += cf->len;
308 stats->rx_packets++;
309
310 netif_rx(skb);
311
312 return 0;
313}
314
315/* handle rx/tx error counters notification */
316static int pucan_handle_error(struct peak_canfd_priv *priv,
317 struct pucan_error_msg *msg)
318{
319 priv->bec.txerr = msg->tx_err_cnt;
320 priv->bec.rxerr = msg->rx_err_cnt;
321
322 return 0;
323}
324
325/* handle status notification */
326static int pucan_handle_status(struct peak_canfd_priv *priv,
327 struct pucan_status_msg *msg)
328{
329 struct net_device *ndev = priv->ndev;
330 struct net_device_stats *stats = &ndev->stats;
331 struct can_frame *cf;
332 struct sk_buff *skb;
333
334 /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
335 if (pucan_status_is_rx_barrier(msg)) {
8ac8321e
SG		 336
337 if (priv->enable_tx_path) {
338 int err = priv->enable_tx_path(priv);
339
340 if (err)
341 return err;
342 }
343
ffd137f7
SG		 344 /* start network queue (echo_skb array is empty) */
345 netif_start_queue(ndev);
8ac8321e
SG		 346
347 return 0;
348 }
349
350 skb = alloc_can_err_skb(ndev, &cf);
351
352 /* test state error bits according to their priority */
353 if (pucan_status_is_busoff(msg)) {
354 netdev_dbg(ndev, "Bus-off entry status\n");
355 priv->can.state = CAN_STATE_BUS_OFF;
356 priv->can.can_stats.bus_off++;
357 can_bus_off(ndev);
358 if (skb)
359 cf->can_id |= CAN_ERR_BUSOFF;
360
361 } else if (pucan_status_is_passive(msg)) {
362 netdev_dbg(ndev, "Error passive status\n");
363 priv->can.state = CAN_STATE_ERROR_PASSIVE;
364 priv->can.can_stats.error_passive++;
365 if (skb) {
366 cf->can_id |= CAN_ERR_CRTL;
367 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
368 CAN_ERR_CRTL_TX_PASSIVE :
369 CAN_ERR_CRTL_RX_PASSIVE;
370 cf->data[6] = priv->bec.txerr;
371 cf->data[7] = priv->bec.rxerr;
372 }
373
374 } else if (pucan_status_is_warning(msg)) {
375 netdev_dbg(ndev, "Error warning status\n");
376 priv->can.state = CAN_STATE_ERROR_WARNING;
377 priv->can.can_stats.error_warning++;
378 if (skb) {
379 cf->can_id |= CAN_ERR_CRTL;
380 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
381 CAN_ERR_CRTL_TX_WARNING :
382 CAN_ERR_CRTL_RX_WARNING;
383 cf->data[6] = priv->bec.txerr;
384 cf->data[7] = priv->bec.rxerr;
385 }
386
387 } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
388 /* back to ERROR_ACTIVE */
389 netdev_dbg(ndev, "Error active status\n");
390 can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
391 CAN_STATE_ERROR_ACTIVE);
392 } else {
393 dev_kfree_skb(skb);
394 return 0;
395 }
396
397 if (!skb) {
398 stats->rx_dropped++;
399 return -ENOMEM;
400 }
401
402 stats->rx_packets++;
403 stats->rx_bytes += cf->can_dlc;
404 netif_rx(skb);
405
406 return 0;
407}
408
409/* handle uCAN Rx overflow notification */
410static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
411{
412 struct net_device_stats *stats = &priv->ndev->stats;
413 struct can_frame *cf;
414 struct sk_buff *skb;
415
416 stats->rx_over_errors++;
417 stats->rx_errors++;
418
419 skb = alloc_can_err_skb(priv->ndev, &cf);
420 if (!skb) {
421 stats->rx_dropped++;
422 return -ENOMEM;
423 }
424
425 cf->can_id |= CAN_ERR_CRTL;
426 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
427
428 cf->data[6] = priv->bec.txerr;
429 cf->data[7] = priv->bec.rxerr;
430
431 stats->rx_bytes += cf->can_dlc;
432 stats->rx_packets++;
433 netif_rx(skb);
434
435 return 0;
436}
437
438/* handle a single uCAN message */
439int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
440 struct pucan_rx_msg *msg)
441{
442 u16 msg_type = le16_to_cpu(msg->type);
443 int msg_size = le16_to_cpu(msg->size);
444 int err;
445
446 if (!msg_size || !msg_type) {
447 /* null packet found: end of list */
448 goto exit;
449 }
450
451 switch (msg_type) {
452 case PUCAN_MSG_CAN_RX:
453 err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
454 break;
455 case PUCAN_MSG_ERROR:
456 err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
457 break;
458 case PUCAN_MSG_STATUS:
459 err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
460 break;
461 case PUCAN_MSG_CACHE_CRITICAL:
462 err = pucan_handle_cache_critical(priv);
463 break;
464 default:
465 err = 0;
466 }
467
468 if (err < 0)
469 return err;
470
471exit:
472 return msg_size;
473}
474
475/* handle a list of rx_count messages from rx_msg memory address */
476int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
477 struct pucan_rx_msg *msg_list, int msg_count)
478{
479 void *msg_ptr = msg_list;
f2a918b4 480 int i, msg_size = 0;
8ac8321e
SG		 481
482 for (i = 0; i < msg_count; i++) {
483 msg_size = peak_canfd_handle_msg(priv, msg_ptr);
484
485 /* a null packet can be found at the end of a list */
486 if (msg_size <= 0)
487 break;
488
489 msg_ptr += msg_size;
490 }
491
492 if (msg_size < 0)
493 return msg_size;
494
495 return i;
496}
497
498static int peak_canfd_start(struct peak_canfd_priv *priv)
499{
500 int err;
501
502 err = pucan_clr_err_counters(priv);
503 if (err)
504 goto err_exit;
505
506 priv->echo_idx = 0;
507
508 priv->bec.txerr = 0;
509 priv->bec.rxerr = 0;
510
511 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
512 err = pucan_set_listen_only_mode(priv);
513 else
514 err = pucan_set_normal_mode(priv);
515
516err_exit:
517 return err;
518}
519
520static void peak_canfd_stop(struct peak_canfd_priv *priv)
521{
522 int err;
523
524 /* go back to RESET mode */
525 err = pucan_set_reset_mode(priv);
526 if (err) {
527 netdev_err(priv->ndev, "channel %u reset failed\n",
528 priv->index);
529 } else {
530 /* abort last Tx (MUST be done in RESET mode only!) */
531 pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH);
532 }
533}
534
535static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
536{
537 struct peak_canfd_priv *priv = netdev_priv(ndev);
538
539 switch (mode) {
540 case CAN_MODE_START:
541 peak_canfd_start(priv);
542 netif_wake_queue(ndev);
543 break;
544 default:
545 return -EOPNOTSUPP;
546 }
547
548 return 0;
549}
550
551static int peak_canfd_get_berr_counter(const struct net_device *ndev,
552 struct can_berr_counter *bec)
553{
554 struct peak_canfd_priv *priv = netdev_priv(ndev);
555
556 *bec = priv->bec;
557 return 0;
558}
559
560static int peak_canfd_open(struct net_device *ndev)
561{
562 struct peak_canfd_priv *priv = netdev_priv(ndev);
563 int i, err = 0;
564
565 err = open_candev(ndev);
566 if (err) {
567 netdev_err(ndev, "open_candev() failed, error %d\n", err);
568 goto err_exit;
569 }
570
571 err = pucan_set_reset_mode(priv);
572 if (err)
573 goto err_close;
574
575 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
576 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
577 err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO);
578 else
579 err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO);
580
581 if (err)
582 goto err_close;
583 }
584
585 /* set option: get rx/tx error counters */
586 err = pucan_set_options(priv, PUCAN_OPTION_ERROR);
587 if (err)
588 goto err_close;
589
590 /* accept all standard CAN ID */
591 for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++)
592 pucan_set_std_filter(priv, i, 0xffffffff);
593
594 err = peak_canfd_start(priv);
595 if (err)
596 goto err_close;
597
598 /* receiving the RB status says when Tx path is ready */
599 err = pucan_setup_rx_barrier(priv);
600 if (!err)
601 goto err_exit;
602
603err_close:
604 close_candev(ndev);
605err_exit:
606 return err;
607}
608
609static int peak_canfd_set_bittiming(struct net_device *ndev)
610{
611 struct peak_canfd_priv *priv = netdev_priv(ndev);
612
613 return pucan_set_timing_slow(priv, &priv->can.bittiming);
614}
615
616static int peak_canfd_set_data_bittiming(struct net_device *ndev)
617{
618 struct peak_canfd_priv *priv = netdev_priv(ndev);
619
620 return pucan_set_timing_fast(priv, &priv->can.data_bittiming);
621}
622
623static int peak_canfd_close(struct net_device *ndev)
624{
625 struct peak_canfd_priv *priv = netdev_priv(ndev);
626
627 netif_stop_queue(ndev);
628 peak_canfd_stop(priv);
629 close_candev(ndev);
630
631 return 0;
632}
633
634static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
635 struct net_device *ndev)
636{
637 struct peak_canfd_priv *priv = netdev_priv(ndev);
638 struct net_device_stats *stats = &ndev->stats;
639 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
640 struct pucan_tx_msg *msg;
641 u16 msg_size, msg_flags;
642 unsigned long flags;
643 bool should_stop_tx_queue;
644 int room_left;
645 u8 can_dlc;
646
647 if (can_dropped_invalid_skb(ndev, skb))
648 return NETDEV_TX_OK;
649
650 msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
651 msg = priv->alloc_tx_msg(priv, msg_size, &room_left);
652
653 /* should never happen except under bus-off condition and (auto-)restart
654 * mechanism
655 */
656 if (!msg) {
657 stats->tx_dropped++;
658 netif_stop_queue(ndev);
659 return NETDEV_TX_BUSY;
660 }
661
662 msg->size = cpu_to_le16(msg_size);
663 msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
664 msg_flags = 0;
665
666 if (cf->can_id & CAN_EFF_FLAG) {
667 msg_flags |= PUCAN_MSG_EXT_ID;
668 msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK);
669 } else {
670 msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
671 }
672
673 if (can_is_canfd_skb(skb)) {
674 /* CAN FD frame format */
675 can_dlc = can_len2dlc(cf->len);
676
677 msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
678
679 if (cf->flags & CANFD_BRS)
680 msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
681
682 if (cf->flags & CANFD_ESI)
683 msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
684 } else {
685 /* CAN 2.0 frame format */
686 can_dlc = cf->len;
687
688 if (cf->can_id & CAN_RTR_FLAG)
689 msg_flags |= PUCAN_MSG_RTR;
690 }
691
692 /* always ask loopback for echo management */
693 msg_flags |= PUCAN_MSG_LOOPED_BACK;
694
695 /* set driver specific bit to differentiate with application loopback */
696 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
697 msg_flags |= PUCAN_MSG_SELF_RECEIVE;
698
699 msg->flags = cpu_to_le16(msg_flags);
700 msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, can_dlc);
701 memcpy(msg->d, cf->data, cf->len);
702
703 /* struct msg client field is used as an index in the echo skbs ring */
704 msg->client = priv->echo_idx;
705
706 spin_lock_irqsave(&priv->echo_lock, flags);
707
708 /* prepare and save echo skb in internal slot */
709 can_put_echo_skb(skb, ndev, priv->echo_idx);
710
711 /* move echo index to the next slot */
712 priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max;
713
714 /* if next slot is not free, stop network queue (no slot free in echo
715 * skb ring means that the controller did not write these frames on
716 * the bus: no need to continue).
717 */
718 should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]);
719
8ac8321e
SG		 720 /* stop network tx queue if not enough room to save one more msg too */
721 if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
722 should_stop_tx_queue |= (room_left <
723 (sizeof(*msg) + CANFD_MAX_DLEN));
724 else
725 should_stop_tx_queue |= (room_left <
726 (sizeof(*msg) + CAN_MAX_DLEN));
727
728 if (should_stop_tx_queue)
729 netif_stop_queue(ndev);
730
e6048a00
SG		 731 spin_unlock_irqrestore(&priv->echo_lock, flags);
732
733 /* write the skb on the interface */
734 priv->write_tx_msg(priv, msg);
735
8ac8321e
SG		 736 return NETDEV_TX_OK;
737}
738
739static const struct net_device_ops peak_canfd_netdev_ops = {
740 .ndo_open = peak_canfd_open,
741 .ndo_stop = peak_canfd_close,
742 .ndo_start_xmit = peak_canfd_start_xmit,
743 .ndo_change_mtu = can_change_mtu,
744};
745
746struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
747 int echo_skb_max)
748{
749 struct net_device *ndev;
750 struct peak_canfd_priv *priv;
751
752 /* we DO support local echo */
753 if (echo_skb_max < 0)
754 echo_skb_max = PCANFD_ECHO_SKB_MAX;
755
756 /* allocate the candev object */
757 ndev = alloc_candev(sizeof_priv, echo_skb_max);
758 if (!ndev)
759 return NULL;
760
761 priv = netdev_priv(ndev);
762
763 /* complete now socket-can initialization side */
764 priv->can.state = CAN_STATE_STOPPED;
765 priv->can.bittiming_const = &peak_canfd_nominal_const;
766 priv->can.data_bittiming_const = &peak_canfd_data_const;
767
768 priv->can.do_set_mode = peak_canfd_set_mode;
769 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;
770 priv->can.do_set_bittiming = peak_canfd_set_bittiming;
771 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;
772 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
773 CAN_CTRLMODE_LISTENONLY |
774 CAN_CTRLMODE_3_SAMPLES |
775 CAN_CTRLMODE_FD |
776 CAN_CTRLMODE_FD_NON_ISO |
777 CAN_CTRLMODE_BERR_REPORTING;
778
779 priv->ndev = ndev;
780 priv->index = index;
781 priv->cmd_len = 0;
782 spin_lock_init(&priv->echo_lock);
783
784 ndev->flags |= IFF_ECHO;
785 ndev->netdev_ops = &peak_canfd_netdev_ops;
786 ndev->dev_id = index;
787
788 return ndev;
789}
Linux 6.x block layer and io_uring tree(s)