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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#include <linux/ethtool.h>
11
12#include "peak_canfd_user.h"
13
14/* internal IP core cache size (used as default echo skbs max number) */
15#define PCANFD_ECHO_SKB_MAX 24
16
17/* bittiming ranges of the PEAK-System PC CAN-FD interfaces */
18static const struct can_bittiming_const peak_canfd_nominal_const = {
19 .name = "peak_canfd",
20 .tseg1_min = 1,
21 .tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS),
22 .tseg2_min = 1,
23 .tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS),
24 .sjw_max = (1 << PUCAN_TSLOW_SJW_BITS),
25 .brp_min = 1,
26 .brp_max = (1 << PUCAN_TSLOW_BRP_BITS),
27 .brp_inc = 1,
28};
29
30static const struct can_bittiming_const peak_canfd_data_const = {
31 .name = "peak_canfd",
32 .tseg1_min = 1,
33 .tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS),
34 .tseg2_min = 1,
35 .tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS),
36 .sjw_max = (1 << PUCAN_TFAST_SJW_BITS),
37 .brp_min = 1,
38 .brp_max = (1 << PUCAN_TFAST_BRP_BITS),
39 .brp_inc = 1,
40};
41
42static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
43{
44 priv->cmd_len = 0;
45 return priv;
46}
47
48static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op)
49{
50 struct pucan_command *cmd;
51
52 if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen)
53 return NULL;
54
55 cmd = priv->cmd_buffer + priv->cmd_len;
56
57 /* reset all unused bit to default */
58 memset(cmd, 0, sizeof(*cmd));
59
60 cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op);
61 priv->cmd_len += sizeof(*cmd);
62
63 return cmd;
64}
65
66static int pucan_write_cmd(struct peak_canfd_priv *priv)
67{
68 int err;
69
70 if (priv->pre_cmd) {
71 err = priv->pre_cmd(priv);
72 if (err)
73 return err;
74 }
75
76 err = priv->write_cmd(priv);
77 if (err)
78 return err;
79
80 if (priv->post_cmd)
81 err = priv->post_cmd(priv);
82
83 return err;
84}
85
86/* uCAN commands interface functions */
87static int pucan_set_reset_mode(struct peak_canfd_priv *priv)
88{
89 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE);
90 return pucan_write_cmd(priv);
91}
92
93static int pucan_set_normal_mode(struct peak_canfd_priv *priv)
94{
95 int err;
96
97 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE);
98 err = pucan_write_cmd(priv);
99 if (!err)
100 priv->can.state = CAN_STATE_ERROR_ACTIVE;
101
102 return err;
103}
104
105static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv)
106{
107 int err;
108
109 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE);
110 err = pucan_write_cmd(priv);
111 if (!err)
112 priv->can.state = CAN_STATE_ERROR_ACTIVE;
113
114 return err;
115}
116
117static int pucan_set_timing_slow(struct peak_canfd_priv *priv,
118 const struct can_bittiming *pbt)
119{
120 struct pucan_timing_slow *cmd;
121
122 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW);
123
124 cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1,
125 priv->can.ctrlmode &
126 CAN_CTRLMODE_3_SAMPLES);
127 cmd->tseg1 = PUCAN_TSLOW_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
128 cmd->tseg2 = PUCAN_TSLOW_TSEG2(pbt->phase_seg2 - 1);
129 cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(pbt->brp - 1));
130
131 cmd->ewl = 96; /* default */
132
133 netdev_dbg(priv->ndev,
134 "nominal: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
135 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw_t);
136
137 return pucan_write_cmd(priv);
138}
139
140static int pucan_set_timing_fast(struct peak_canfd_priv *priv,
141 const struct can_bittiming *pbt)
142{
143 struct pucan_timing_fast *cmd;
144
145 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST);
146
147 cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1);
148 cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
149 cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1);
150 cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1));
151
152 netdev_dbg(priv->ndev,
153 "data: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
154 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw);
155
156 return pucan_write_cmd(priv);
157}
158
159static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask)
160{
161 struct pucan_std_filter *cmd;
162
163 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER);
164
165 /* all the 11-bits CAN ID values are represented by one bit in a
166 * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the
167 * row while the lowest 5 bits select the bit in that row.
168 *
169 * bit filter
170 * 1 passed
171 * 0 discarded
172 */
173
174 /* select the row */
175 cmd->idx = row;
176
177 /* set/unset bits in the row */
178 cmd->mask = cpu_to_le32(mask);
179
180 return pucan_write_cmd(priv);
181}
182
183static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags)
184{
185 struct pucan_tx_abort *cmd;
186
187 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT);
188
189 cmd->flags = cpu_to_le16(flags);
190
191 return pucan_write_cmd(priv);
192}
193
194static int pucan_clr_err_counters(struct peak_canfd_priv *priv)
195{
196 struct pucan_wr_err_cnt *cmd;
197
198 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT);
199
200 cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE);
201 cmd->tx_counter = 0;
202 cmd->rx_counter = 0;
203
204 return pucan_write_cmd(priv);
205}
206
207static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask)
208{
209 struct pucan_options *cmd;
210
211 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION);
212
213 cmd->options = cpu_to_le16(opt_mask);
214
215 return pucan_write_cmd(priv);
216}
217
218static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask)
219{
220 struct pucan_options *cmd;
221
222 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION);
223
224 cmd->options = cpu_to_le16(opt_mask);
225
226 return pucan_write_cmd(priv);
227}
228
229static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv)
230{
231 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER);
232
233 return pucan_write_cmd(priv);
234}
235
236static int pucan_netif_rx(struct sk_buff *skb, __le32 ts_low, __le32 ts_high)
237{
238 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
239 u64 ts_us;
240
241 ts_us = (u64)le32_to_cpu(ts_high) << 32;
242 ts_us |= le32_to_cpu(ts_low);
243
244 /* IP core timestamps are µs. */
245 hwts->hwtstamp = ns_to_ktime(ts_us * NSEC_PER_USEC);
246
247 return netif_rx(skb);
248}
249
250/* handle the reception of one CAN frame */
251static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
252 struct pucan_rx_msg *msg)
253{
254 struct net_device_stats *stats = &priv->ndev->stats;
255 struct canfd_frame *cf;
256 struct sk_buff *skb;
257 const u16 rx_msg_flags = le16_to_cpu(msg->flags);
258 u8 cf_len;
259
260 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
261 cf_len = can_fd_dlc2len(pucan_msg_get_dlc(msg));
262 else
263 cf_len = can_cc_dlc2len(pucan_msg_get_dlc(msg));
264
265 /* if this frame is an echo, */
266 if (rx_msg_flags & PUCAN_MSG_LOOPED_BACK) {
267 unsigned long flags;
268
269 spin_lock_irqsave(&priv->echo_lock, flags);
270
271 /* count bytes of the echo instead of skb */
272 stats->tx_bytes += can_get_echo_skb(priv->ndev, msg->client, NULL);
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 }
320 stats->rx_packets++;
321
322 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
323
324 return 0;
325}
326
327/* handle rx/tx error counters notification */
328static int pucan_handle_error(struct peak_canfd_priv *priv,
329 struct pucan_error_msg *msg)
330{
331 priv->bec.txerr = msg->tx_err_cnt;
332 priv->bec.rxerr = msg->rx_err_cnt;
333
334 return 0;
335}
336
337/* handle status notification */
338static int pucan_handle_status(struct peak_canfd_priv *priv,
339 struct pucan_status_msg *msg)
340{
341 struct net_device *ndev = priv->ndev;
342 struct net_device_stats *stats = &ndev->stats;
343 struct can_frame *cf;
344 struct sk_buff *skb;
345
346 /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
347 if (pucan_status_is_rx_barrier(msg)) {
348 if (priv->enable_tx_path) {
349 int err = priv->enable_tx_path(priv);
350
351 if (err)
352 return err;
353 }
354
355 /* wake network queue up (echo_skb array is empty) */
356 netif_wake_queue(ndev);
357
358 return 0;
359 }
360
361 skb = alloc_can_err_skb(ndev, &cf);
362
363 /* test state error bits according to their priority */
364 if (pucan_status_is_busoff(msg)) {
365 netdev_dbg(ndev, "Bus-off entry status\n");
366 priv->can.state = CAN_STATE_BUS_OFF;
367 priv->can.can_stats.bus_off++;
368 can_bus_off(ndev);
369 if (skb)
370 cf->can_id |= CAN_ERR_BUSOFF;
371
372 } else if (pucan_status_is_passive(msg)) {
373 netdev_dbg(ndev, "Error passive status\n");
374 priv->can.state = CAN_STATE_ERROR_PASSIVE;
375 priv->can.can_stats.error_passive++;
376 if (skb) {
377 cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
378 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
379 CAN_ERR_CRTL_TX_PASSIVE :
380 CAN_ERR_CRTL_RX_PASSIVE;
381 cf->data[6] = priv->bec.txerr;
382 cf->data[7] = priv->bec.rxerr;
383 }
384
385 } else if (pucan_status_is_warning(msg)) {
386 netdev_dbg(ndev, "Error warning status\n");
387 priv->can.state = CAN_STATE_ERROR_WARNING;
388 priv->can.can_stats.error_warning++;
389 if (skb) {
390 cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
391 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
392 CAN_ERR_CRTL_TX_WARNING :
393 CAN_ERR_CRTL_RX_WARNING;
394 cf->data[6] = priv->bec.txerr;
395 cf->data[7] = priv->bec.rxerr;
396 }
397
398 } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
399 /* back to ERROR_ACTIVE */
400 netdev_dbg(ndev, "Error active status\n");
401 can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
402 CAN_STATE_ERROR_ACTIVE);
403 } else {
404 dev_kfree_skb(skb);
405 return 0;
406 }
407
408 if (!skb) {
409 stats->rx_dropped++;
410 return -ENOMEM;
411 }
412
413 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
414
415 return 0;
416}
417
418/* handle uCAN Rx overflow notification */
419static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
420{
421 struct net_device_stats *stats = &priv->ndev->stats;
422 struct can_frame *cf;
423 struct sk_buff *skb;
424
425 stats->rx_over_errors++;
426 stats->rx_errors++;
427
428 skb = alloc_can_err_skb(priv->ndev, &cf);
429 if (!skb) {
430 stats->rx_dropped++;
431 return -ENOMEM;
432 }
433
434 cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
435 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
436
437 cf->data[6] = priv->bec.txerr;
438 cf->data[7] = priv->bec.rxerr;
439
440 netif_rx(skb);
441
442 return 0;
443}
444
445/* handle a single uCAN message */
446int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
447 struct pucan_rx_msg *msg)
448{
449 u16 msg_type = le16_to_cpu(msg->type);
450 int msg_size = le16_to_cpu(msg->size);
451 int err;
452
453 if (!msg_size || !msg_type) {
454 /* null packet found: end of list */
455 goto exit;
456 }
457
458 switch (msg_type) {
459 case PUCAN_MSG_CAN_RX:
460 err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
461 break;
462 case PUCAN_MSG_ERROR:
463 err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
464 break;
465 case PUCAN_MSG_STATUS:
466 err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
467 break;
468 case PUCAN_MSG_CACHE_CRITICAL:
469 err = pucan_handle_cache_critical(priv);
470 break;
471 default:
472 err = 0;
473 }
474
475 if (err < 0)
476 return err;
477
478exit:
479 return msg_size;
480}
481
482/* handle a list of rx_count messages from rx_msg memory address */
483int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
484 struct pucan_rx_msg *msg_list, int msg_count)
485{
486 void *msg_ptr = msg_list;
487 int i, msg_size = 0;
488
489 for (i = 0; i < msg_count; i++) {
490 msg_size = peak_canfd_handle_msg(priv, msg_ptr);
491
492 /* a null packet can be found at the end of a list */
493 if (msg_size <= 0)
494 break;
495
496 msg_ptr += ALIGN(msg_size, 4);
497 }
498
499 if (msg_size < 0)
500 return msg_size;
501
502 return i;
503}
504
505static int peak_canfd_start(struct peak_canfd_priv *priv)
506{
507 int err;
508
509 err = pucan_clr_err_counters(priv);
510 if (err)
511 goto err_exit;
512
513 priv->echo_idx = 0;
514
515 priv->bec.txerr = 0;
516 priv->bec.rxerr = 0;
517
518 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
519 err = pucan_set_listen_only_mode(priv);
520 else
521 err = pucan_set_normal_mode(priv);
522
523err_exit:
524 return err;
525}
526
527static void peak_canfd_stop(struct peak_canfd_priv *priv)
528{
529 int err;
530
531 /* go back to RESET mode */
532 err = pucan_set_reset_mode(priv);
533 if (err) {
534 netdev_err(priv->ndev, "channel %u reset failed\n",
535 priv->index);
536 } else {
537 /* abort last Tx (MUST be done in RESET mode only!) */
538 pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH);
539 }
540}
541
542static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
543{
544 struct peak_canfd_priv *priv = netdev_priv(ndev);
545
546 switch (mode) {
547 case CAN_MODE_START:
548 peak_canfd_start(priv);
549 netif_wake_queue(ndev);
550 break;
551 default:
552 return -EOPNOTSUPP;
553 }
554
555 return 0;
556}
557
558static int peak_canfd_get_berr_counter(const struct net_device *ndev,
559 struct can_berr_counter *bec)
560{
561 struct peak_canfd_priv *priv = netdev_priv(ndev);
562
563 *bec = priv->bec;
564 return 0;
565}
566
567static int peak_canfd_open(struct net_device *ndev)
568{
569 struct peak_canfd_priv *priv = netdev_priv(ndev);
570 int i, err = 0;
571
572 err = open_candev(ndev);
573 if (err) {
574 netdev_err(ndev, "open_candev() failed, error %d\n", err);
575 goto err_exit;
576 }
577
578 err = pucan_set_reset_mode(priv);
579 if (err)
580 goto err_close;
581
582 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
583 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
584 err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO);
585 else
586 err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO);
587
588 if (err)
589 goto err_close;
590 }
591
592 /* set option: get rx/tx error counters */
593 err = pucan_set_options(priv, PUCAN_OPTION_ERROR);
594 if (err)
595 goto err_close;
596
597 /* accept all standard CAN ID */
598 for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++)
599 pucan_set_std_filter(priv, i, 0xffffffff);
600
601 err = peak_canfd_start(priv);
602 if (err)
603 goto err_close;
604
605 /* receiving the RB status says when Tx path is ready */
606 err = pucan_setup_rx_barrier(priv);
607 if (!err)
608 goto err_exit;
609
610err_close:
611 close_candev(ndev);
612err_exit:
613 return err;
614}
615
616static int peak_canfd_set_bittiming(struct net_device *ndev)
617{
618 struct peak_canfd_priv *priv = netdev_priv(ndev);
619
620 return pucan_set_timing_slow(priv, &priv->can.bittiming);
621}
622
623static int peak_canfd_set_data_bittiming(struct net_device *ndev)
624{
625 struct peak_canfd_priv *priv = netdev_priv(ndev);
626
627 return pucan_set_timing_fast(priv, &priv->can.data_bittiming);
628}
629
630static int peak_canfd_close(struct net_device *ndev)
631{
632 struct peak_canfd_priv *priv = netdev_priv(ndev);
633
634 netif_stop_queue(ndev);
635 peak_canfd_stop(priv);
636 close_candev(ndev);
637
638 return 0;
639}
640
641static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
642 struct net_device *ndev)
643{
644 struct peak_canfd_priv *priv = netdev_priv(ndev);
645 struct net_device_stats *stats = &ndev->stats;
646 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
647 struct pucan_tx_msg *msg;
648 u16 msg_size, msg_flags;
649 unsigned long flags;
650 bool should_stop_tx_queue;
651 int room_left;
652 u8 len;
653
654 if (can_dev_dropped_skb(ndev, skb))
655 return NETDEV_TX_OK;
656
657 msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
658 msg = priv->alloc_tx_msg(priv, msg_size, &room_left);
659
660 /* should never happen except under bus-off condition and (auto-)restart
661 * mechanism
662 */
663 if (!msg) {
664 stats->tx_dropped++;
665 netif_stop_queue(ndev);
666 return NETDEV_TX_BUSY;
667 }
668
669 msg->size = cpu_to_le16(msg_size);
670 msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
671 msg_flags = 0;
672
673 if (cf->can_id & CAN_EFF_FLAG) {
674 msg_flags |= PUCAN_MSG_EXT_ID;
675 msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK);
676 } else {
677 msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
678 }
679
680 if (can_is_canfd_skb(skb)) {
681 /* CAN FD frame format */
682 len = can_fd_len2dlc(cf->len);
683
684 msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
685
686 if (cf->flags & CANFD_BRS)
687 msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
688
689 if (cf->flags & CANFD_ESI)
690 msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
691 } else {
692 /* CAN 2.0 frame format */
693 len = cf->len;
694
695 if (cf->can_id & CAN_RTR_FLAG)
696 msg_flags |= PUCAN_MSG_RTR;
697 }
698
699 /* always ask loopback for echo management */
700 msg_flags |= PUCAN_MSG_LOOPED_BACK;
701
702 /* set driver specific bit to differentiate with application loopback */
703 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
704 msg_flags |= PUCAN_MSG_SELF_RECEIVE;
705
706 msg->flags = cpu_to_le16(msg_flags);
707 msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, len);
708 memcpy(msg->d, cf->data, cf->len);
709
710 /* struct msg client field is used as an index in the echo skbs ring */
711 msg->client = priv->echo_idx;
712
713 spin_lock_irqsave(&priv->echo_lock, flags);
714
715 /* prepare and save echo skb in internal slot */
716 can_put_echo_skb(skb, ndev, priv->echo_idx, 0);
717
718 /* move echo index to the next slot */
719 priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max;
720
721 /* if next slot is not free, stop network queue (no slot free in echo
722 * skb ring means that the controller did not write these frames on
723 * the bus: no need to continue).
724 */
725 should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]);
726
727 /* stop network tx queue if not enough room to save one more msg too */
728 if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
729 should_stop_tx_queue |= (room_left <
730 (sizeof(*msg) + CANFD_MAX_DLEN));
731 else
732 should_stop_tx_queue |= (room_left <
733 (sizeof(*msg) + CAN_MAX_DLEN));
734
735 if (should_stop_tx_queue)
736 netif_stop_queue(ndev);
737
738 spin_unlock_irqrestore(&priv->echo_lock, flags);
739
740 /* write the skb on the interface */
741 priv->write_tx_msg(priv, msg);
742
743 return NETDEV_TX_OK;
744}
745
746static int peak_eth_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
747{
748 struct hwtstamp_config hwts_cfg = { 0 };
749
750 switch (cmd) {
751 case SIOCSHWTSTAMP: /* set */
752 if (copy_from_user(&hwts_cfg, ifr->ifr_data, sizeof(hwts_cfg)))
753 return -EFAULT;
754 if (hwts_cfg.tx_type == HWTSTAMP_TX_OFF &&
755 hwts_cfg.rx_filter == HWTSTAMP_FILTER_ALL)
756 return 0;
757 return -ERANGE;
758
759 case SIOCGHWTSTAMP: /* get */
760 hwts_cfg.tx_type = HWTSTAMP_TX_OFF;
761 hwts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
762 if (copy_to_user(ifr->ifr_data, &hwts_cfg, sizeof(hwts_cfg)))
763 return -EFAULT;
764 return 0;
765
766 default:
767 return -EOPNOTSUPP;
768 }
769}
770
771static const struct net_device_ops peak_canfd_netdev_ops = {
772 .ndo_open = peak_canfd_open,
773 .ndo_stop = peak_canfd_close,
774 .ndo_eth_ioctl = peak_eth_ioctl,
775 .ndo_start_xmit = peak_canfd_start_xmit,
776 .ndo_change_mtu = can_change_mtu,
777};
778
779static int peak_get_ts_info(struct net_device *dev,
780 struct ethtool_ts_info *info)
781{
782 info->so_timestamping =
783 SOF_TIMESTAMPING_TX_SOFTWARE |
784 SOF_TIMESTAMPING_RX_SOFTWARE |
785 SOF_TIMESTAMPING_SOFTWARE |
786 SOF_TIMESTAMPING_RX_HARDWARE |
787 SOF_TIMESTAMPING_RAW_HARDWARE;
788 info->phc_index = -1;
789 info->tx_types = BIT(HWTSTAMP_TX_OFF);
790 info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
791
792 return 0;
793}
794
795static const struct ethtool_ops peak_canfd_ethtool_ops = {
796 .get_ts_info = peak_get_ts_info,
797};
798
799struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
800 int echo_skb_max)
801{
802 struct net_device *ndev;
803 struct peak_canfd_priv *priv;
804
805 /* we DO support local echo */
806 if (echo_skb_max < 0)
807 echo_skb_max = PCANFD_ECHO_SKB_MAX;
808
809 /* allocate the candev object */
810 ndev = alloc_candev(sizeof_priv, echo_skb_max);
811 if (!ndev)
812 return NULL;
813
814 priv = netdev_priv(ndev);
815
816 /* complete now socket-can initialization side */
817 priv->can.state = CAN_STATE_STOPPED;
818 priv->can.bittiming_const = &peak_canfd_nominal_const;
819 priv->can.data_bittiming_const = &peak_canfd_data_const;
820
821 priv->can.do_set_mode = peak_canfd_set_mode;
822 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;
823 priv->can.do_set_bittiming = peak_canfd_set_bittiming;
824 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;
825 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
826 CAN_CTRLMODE_LISTENONLY |
827 CAN_CTRLMODE_3_SAMPLES |
828 CAN_CTRLMODE_FD |
829 CAN_CTRLMODE_FD_NON_ISO |
830 CAN_CTRLMODE_BERR_REPORTING;
831
832 priv->ndev = ndev;
833 priv->index = index;
834 priv->cmd_len = 0;
835 spin_lock_init(&priv->echo_lock);
836
837 ndev->flags |= IFF_ECHO;
838 ndev->netdev_ops = &peak_canfd_netdev_ops;
839 ndev->ethtool_ops = &peak_canfd_ethtool_ops;
840 ndev->dev_id = index;
841
842 return ndev;
843}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
4 * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
5 *
6 * Copyright (C) 2016 PEAK System-Technik GmbH
7 */
8
9#include <linux/can.h>
10#include <linux/can/dev.h>
11
12#include "peak_canfd_user.h"
13
14/* internal IP core cache size (used as default echo skbs max number) */
15#define PCANFD_ECHO_SKB_MAX 24
16
17/* bittiming ranges of the PEAK-System PC CAN-FD interfaces */
18static const struct can_bittiming_const peak_canfd_nominal_const = {
19 .name = "peak_canfd",
20 .tseg1_min = 1,
21 .tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS),
22 .tseg2_min = 1,
23 .tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS),
24 .sjw_max = (1 << PUCAN_TSLOW_SJW_BITS),
25 .brp_min = 1,
26 .brp_max = (1 << PUCAN_TSLOW_BRP_BITS),
27 .brp_inc = 1,
28};
29
30static const struct can_bittiming_const peak_canfd_data_const = {
31 .name = "peak_canfd",
32 .tseg1_min = 1,
33 .tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS),
34 .tseg2_min = 1,
35 .tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS),
36 .sjw_max = (1 << PUCAN_TFAST_SJW_BITS),
37 .brp_min = 1,
38 .brp_max = (1 << PUCAN_TFAST_BRP_BITS),
39 .brp_inc = 1,
40};
41
42static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
43{
44 priv->cmd_len = 0;
45 return priv;
46}
47
48static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op)
49{
50 struct pucan_command *cmd;
51
52 if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen)
53 return NULL;
54
55 cmd = priv->cmd_buffer + priv->cmd_len;
56
57 /* reset all unused bit to default */
58 memset(cmd, 0, sizeof(*cmd));
59
60 cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op);
61 priv->cmd_len += sizeof(*cmd);
62
63 return cmd;
64}
65
66static int pucan_write_cmd(struct peak_canfd_priv *priv)
67{
68 int err;
69
70 if (priv->pre_cmd) {
71 err = priv->pre_cmd(priv);
72 if (err)
73 return err;
74 }
75
76 err = priv->write_cmd(priv);
77 if (err)
78 return err;
79
80 if (priv->post_cmd)
81 err = priv->post_cmd(priv);
82
83 return err;
84}
85
86/* uCAN commands interface functions */
87static int pucan_set_reset_mode(struct peak_canfd_priv *priv)
88{
89 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE);
90 return pucan_write_cmd(priv);
91}
92
93static int pucan_set_normal_mode(struct peak_canfd_priv *priv)
94{
95 int err;
96
97 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE);
98 err = pucan_write_cmd(priv);
99 if (!err)
100 priv->can.state = CAN_STATE_ERROR_ACTIVE;
101
102 return err;
103}
104
105static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv)
106{
107 int err;
108
109 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE);
110 err = pucan_write_cmd(priv);
111 if (!err)
112 priv->can.state = CAN_STATE_ERROR_ACTIVE;
113
114 return err;
115}
116
117static int pucan_set_timing_slow(struct peak_canfd_priv *priv,
118 const struct can_bittiming *pbt)
119{
120 struct pucan_timing_slow *cmd;
121
122 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW);
123
124 cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1,
125 priv->can.ctrlmode & 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
139static 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
158static 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
182static 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
193static 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
206static 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
217static 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
228static 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/* handle the reception of one CAN frame */
236static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
237 struct pucan_rx_msg *msg)
238{
239 struct net_device_stats *stats = &priv->ndev->stats;
240 struct canfd_frame *cf;
241 struct sk_buff *skb;
242 const u16 rx_msg_flags = le16_to_cpu(msg->flags);
243 u8 cf_len;
244
245 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
246 cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
247 else
248 cf_len = get_can_dlc(pucan_msg_get_dlc(msg));
249
250 /* if this frame is an echo, */
251 if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) &&
252 !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) {
253 unsigned long flags;
254
255 spin_lock_irqsave(&priv->echo_lock, flags);
256 can_get_echo_skb(priv->ndev, msg->client);
257
258 /* count bytes of the echo instead of skb */
259 stats->tx_bytes += cf_len;
260 stats->tx_packets++;
261
262 /* restart tx queue (a slot is free) */
263 netif_wake_queue(priv->ndev);
264
265 spin_unlock_irqrestore(&priv->echo_lock, flags);
266 return 0;
267 }
268
269 /* otherwise, it should be pushed into rx fifo */
270 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
271 /* CANFD frame case */
272 skb = alloc_canfd_skb(priv->ndev, &cf);
273 if (!skb)
274 return -ENOMEM;
275
276 if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
277 cf->flags |= CANFD_BRS;
278
279 if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
280 cf->flags |= CANFD_ESI;
281 } else {
282 /* CAN 2.0 frame case */
283 skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
284 if (!skb)
285 return -ENOMEM;
286 }
287
288 cf->can_id = le32_to_cpu(msg->can_id);
289 cf->len = cf_len;
290
291 if (rx_msg_flags & PUCAN_MSG_EXT_ID)
292 cf->can_id |= CAN_EFF_FLAG;
293
294 if (rx_msg_flags & PUCAN_MSG_RTR)
295 cf->can_id |= CAN_RTR_FLAG;
296 else
297 memcpy(cf->data, msg->d, cf->len);
298
299 stats->rx_bytes += cf->len;
300 stats->rx_packets++;
301
302 netif_rx(skb);
303
304 return 0;
305}
306
307/* handle rx/tx error counters notification */
308static int pucan_handle_error(struct peak_canfd_priv *priv,
309 struct pucan_error_msg *msg)
310{
311 priv->bec.txerr = msg->tx_err_cnt;
312 priv->bec.rxerr = msg->rx_err_cnt;
313
314 return 0;
315}
316
317/* handle status notification */
318static int pucan_handle_status(struct peak_canfd_priv *priv,
319 struct pucan_status_msg *msg)
320{
321 struct net_device *ndev = priv->ndev;
322 struct net_device_stats *stats = &ndev->stats;
323 struct can_frame *cf;
324 struct sk_buff *skb;
325
326 /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
327 if (pucan_status_is_rx_barrier(msg)) {
328
329 if (priv->enable_tx_path) {
330 int err = priv->enable_tx_path(priv);
331
332 if (err)
333 return err;
334 }
335
336 /* start network queue (echo_skb array is empty) */
337 netif_start_queue(ndev);
338
339 return 0;
340 }
341
342 skb = alloc_can_err_skb(ndev, &cf);
343
344 /* test state error bits according to their priority */
345 if (pucan_status_is_busoff(msg)) {
346 netdev_dbg(ndev, "Bus-off entry status\n");
347 priv->can.state = CAN_STATE_BUS_OFF;
348 priv->can.can_stats.bus_off++;
349 can_bus_off(ndev);
350 if (skb)
351 cf->can_id |= CAN_ERR_BUSOFF;
352
353 } else if (pucan_status_is_passive(msg)) {
354 netdev_dbg(ndev, "Error passive status\n");
355 priv->can.state = CAN_STATE_ERROR_PASSIVE;
356 priv->can.can_stats.error_passive++;
357 if (skb) {
358 cf->can_id |= CAN_ERR_CRTL;
359 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
360 CAN_ERR_CRTL_TX_PASSIVE :
361 CAN_ERR_CRTL_RX_PASSIVE;
362 cf->data[6] = priv->bec.txerr;
363 cf->data[7] = priv->bec.rxerr;
364 }
365
366 } else if (pucan_status_is_warning(msg)) {
367 netdev_dbg(ndev, "Error warning status\n");
368 priv->can.state = CAN_STATE_ERROR_WARNING;
369 priv->can.can_stats.error_warning++;
370 if (skb) {
371 cf->can_id |= CAN_ERR_CRTL;
372 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
373 CAN_ERR_CRTL_TX_WARNING :
374 CAN_ERR_CRTL_RX_WARNING;
375 cf->data[6] = priv->bec.txerr;
376 cf->data[7] = priv->bec.rxerr;
377 }
378
379 } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
380 /* back to ERROR_ACTIVE */
381 netdev_dbg(ndev, "Error active status\n");
382 can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
383 CAN_STATE_ERROR_ACTIVE);
384 } else {
385 dev_kfree_skb(skb);
386 return 0;
387 }
388
389 if (!skb) {
390 stats->rx_dropped++;
391 return -ENOMEM;
392 }
393
394 stats->rx_packets++;
395 stats->rx_bytes += cf->can_dlc;
396 netif_rx(skb);
397
398 return 0;
399}
400
401/* handle uCAN Rx overflow notification */
402static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
403{
404 struct net_device_stats *stats = &priv->ndev->stats;
405 struct can_frame *cf;
406 struct sk_buff *skb;
407
408 stats->rx_over_errors++;
409 stats->rx_errors++;
410
411 skb = alloc_can_err_skb(priv->ndev, &cf);
412 if (!skb) {
413 stats->rx_dropped++;
414 return -ENOMEM;
415 }
416
417 cf->can_id |= CAN_ERR_CRTL;
418 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
419
420 cf->data[6] = priv->bec.txerr;
421 cf->data[7] = priv->bec.rxerr;
422
423 stats->rx_bytes += cf->can_dlc;
424 stats->rx_packets++;
425 netif_rx(skb);
426
427 return 0;
428}
429
430/* handle a single uCAN message */
431int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
432 struct pucan_rx_msg *msg)
433{
434 u16 msg_type = le16_to_cpu(msg->type);
435 int msg_size = le16_to_cpu(msg->size);
436 int err;
437
438 if (!msg_size || !msg_type) {
439 /* null packet found: end of list */
440 goto exit;
441 }
442
443 switch (msg_type) {
444 case PUCAN_MSG_CAN_RX:
445 err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
446 break;
447 case PUCAN_MSG_ERROR:
448 err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
449 break;
450 case PUCAN_MSG_STATUS:
451 err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
452 break;
453 case PUCAN_MSG_CACHE_CRITICAL:
454 err = pucan_handle_cache_critical(priv);
455 break;
456 default:
457 err = 0;
458 }
459
460 if (err < 0)
461 return err;
462
463exit:
464 return msg_size;
465}
466
467/* handle a list of rx_count messages from rx_msg memory address */
468int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
469 struct pucan_rx_msg *msg_list, int msg_count)
470{
471 void *msg_ptr = msg_list;
472 int i, msg_size = 0;
473
474 for (i = 0; i < msg_count; i++) {
475 msg_size = peak_canfd_handle_msg(priv, msg_ptr);
476
477 /* a null packet can be found at the end of a list */
478 if (msg_size <= 0)
479 break;
480
481 msg_ptr += ALIGN(msg_size, 4);
482 }
483
484 if (msg_size < 0)
485 return msg_size;
486
487 return i;
488}
489
490static int peak_canfd_start(struct peak_canfd_priv *priv)
491{
492 int err;
493
494 err = pucan_clr_err_counters(priv);
495 if (err)
496 goto err_exit;
497
498 priv->echo_idx = 0;
499
500 priv->bec.txerr = 0;
501 priv->bec.rxerr = 0;
502
503 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
504 err = pucan_set_listen_only_mode(priv);
505 else
506 err = pucan_set_normal_mode(priv);
507
508err_exit:
509 return err;
510}
511
512static void peak_canfd_stop(struct peak_canfd_priv *priv)
513{
514 int err;
515
516 /* go back to RESET mode */
517 err = pucan_set_reset_mode(priv);
518 if (err) {
519 netdev_err(priv->ndev, "channel %u reset failed\n",
520 priv->index);
521 } else {
522 /* abort last Tx (MUST be done in RESET mode only!) */
523 pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH);
524 }
525}
526
527static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
528{
529 struct peak_canfd_priv *priv = netdev_priv(ndev);
530
531 switch (mode) {
532 case CAN_MODE_START:
533 peak_canfd_start(priv);
534 netif_wake_queue(ndev);
535 break;
536 default:
537 return -EOPNOTSUPP;
538 }
539
540 return 0;
541}
542
543static int peak_canfd_get_berr_counter(const struct net_device *ndev,
544 struct can_berr_counter *bec)
545{
546 struct peak_canfd_priv *priv = netdev_priv(ndev);
547
548 *bec = priv->bec;
549 return 0;
550}
551
552static int peak_canfd_open(struct net_device *ndev)
553{
554 struct peak_canfd_priv *priv = netdev_priv(ndev);
555 int i, err = 0;
556
557 err = open_candev(ndev);
558 if (err) {
559 netdev_err(ndev, "open_candev() failed, error %d\n", err);
560 goto err_exit;
561 }
562
563 err = pucan_set_reset_mode(priv);
564 if (err)
565 goto err_close;
566
567 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
568 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
569 err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO);
570 else
571 err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO);
572
573 if (err)
574 goto err_close;
575 }
576
577 /* set option: get rx/tx error counters */
578 err = pucan_set_options(priv, PUCAN_OPTION_ERROR);
579 if (err)
580 goto err_close;
581
582 /* accept all standard CAN ID */
583 for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++)
584 pucan_set_std_filter(priv, i, 0xffffffff);
585
586 err = peak_canfd_start(priv);
587 if (err)
588 goto err_close;
589
590 /* receiving the RB status says when Tx path is ready */
591 err = pucan_setup_rx_barrier(priv);
592 if (!err)
593 goto err_exit;
594
595err_close:
596 close_candev(ndev);
597err_exit:
598 return err;
599}
600
601static int peak_canfd_set_bittiming(struct net_device *ndev)
602{
603 struct peak_canfd_priv *priv = netdev_priv(ndev);
604
605 return pucan_set_timing_slow(priv, &priv->can.bittiming);
606}
607
608static int peak_canfd_set_data_bittiming(struct net_device *ndev)
609{
610 struct peak_canfd_priv *priv = netdev_priv(ndev);
611
612 return pucan_set_timing_fast(priv, &priv->can.data_bittiming);
613}
614
615static int peak_canfd_close(struct net_device *ndev)
616{
617 struct peak_canfd_priv *priv = netdev_priv(ndev);
618
619 netif_stop_queue(ndev);
620 peak_canfd_stop(priv);
621 close_candev(ndev);
622
623 return 0;
624}
625
626static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
627 struct net_device *ndev)
628{
629 struct peak_canfd_priv *priv = netdev_priv(ndev);
630 struct net_device_stats *stats = &ndev->stats;
631 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
632 struct pucan_tx_msg *msg;
633 u16 msg_size, msg_flags;
634 unsigned long flags;
635 bool should_stop_tx_queue;
636 int room_left;
637 u8 can_dlc;
638
639 if (can_dropped_invalid_skb(ndev, skb))
640 return NETDEV_TX_OK;
641
642 msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
643 msg = priv->alloc_tx_msg(priv, msg_size, &room_left);
644
645 /* should never happen except under bus-off condition and (auto-)restart
646 * mechanism
647 */
648 if (!msg) {
649 stats->tx_dropped++;
650 netif_stop_queue(ndev);
651 return NETDEV_TX_BUSY;
652 }
653
654 msg->size = cpu_to_le16(msg_size);
655 msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
656 msg_flags = 0;
657
658 if (cf->can_id & CAN_EFF_FLAG) {
659 msg_flags |= PUCAN_MSG_EXT_ID;
660 msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK);
661 } else {
662 msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
663 }
664
665 if (can_is_canfd_skb(skb)) {
666 /* CAN FD frame format */
667 can_dlc = can_len2dlc(cf->len);
668
669 msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
670
671 if (cf->flags & CANFD_BRS)
672 msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
673
674 if (cf->flags & CANFD_ESI)
675 msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
676 } else {
677 /* CAN 2.0 frame format */
678 can_dlc = cf->len;
679
680 if (cf->can_id & CAN_RTR_FLAG)
681 msg_flags |= PUCAN_MSG_RTR;
682 }
683
684 /* always ask loopback for echo management */
685 msg_flags |= PUCAN_MSG_LOOPED_BACK;
686
687 /* set driver specific bit to differentiate with application loopback */
688 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
689 msg_flags |= PUCAN_MSG_SELF_RECEIVE;
690
691 msg->flags = cpu_to_le16(msg_flags);
692 msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, can_dlc);
693 memcpy(msg->d, cf->data, cf->len);
694
695 /* struct msg client field is used as an index in the echo skbs ring */
696 msg->client = priv->echo_idx;
697
698 spin_lock_irqsave(&priv->echo_lock, flags);
699
700 /* prepare and save echo skb in internal slot */
701 can_put_echo_skb(skb, ndev, priv->echo_idx);
702
703 /* move echo index to the next slot */
704 priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max;
705
706 /* if next slot is not free, stop network queue (no slot free in echo
707 * skb ring means that the controller did not write these frames on
708 * the bus: no need to continue).
709 */
710 should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]);
711
712 /* stop network tx queue if not enough room to save one more msg too */
713 if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
714 should_stop_tx_queue |= (room_left <
715 (sizeof(*msg) + CANFD_MAX_DLEN));
716 else
717 should_stop_tx_queue |= (room_left <
718 (sizeof(*msg) + CAN_MAX_DLEN));
719
720 if (should_stop_tx_queue)
721 netif_stop_queue(ndev);
722
723 spin_unlock_irqrestore(&priv->echo_lock, flags);
724
725 /* write the skb on the interface */
726 priv->write_tx_msg(priv, msg);
727
728 return NETDEV_TX_OK;
729}
730
731static const struct net_device_ops peak_canfd_netdev_ops = {
732 .ndo_open = peak_canfd_open,
733 .ndo_stop = peak_canfd_close,
734 .ndo_start_xmit = peak_canfd_start_xmit,
735 .ndo_change_mtu = can_change_mtu,
736};
737
738struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
739 int echo_skb_max)
740{
741 struct net_device *ndev;
742 struct peak_canfd_priv *priv;
743
744 /* we DO support local echo */
745 if (echo_skb_max < 0)
746 echo_skb_max = PCANFD_ECHO_SKB_MAX;
747
748 /* allocate the candev object */
749 ndev = alloc_candev(sizeof_priv, echo_skb_max);
750 if (!ndev)
751 return NULL;
752
753 priv = netdev_priv(ndev);
754
755 /* complete now socket-can initialization side */
756 priv->can.state = CAN_STATE_STOPPED;
757 priv->can.bittiming_const = &peak_canfd_nominal_const;
758 priv->can.data_bittiming_const = &peak_canfd_data_const;
759
760 priv->can.do_set_mode = peak_canfd_set_mode;
761 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;
762 priv->can.do_set_bittiming = peak_canfd_set_bittiming;
763 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;
764 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
765 CAN_CTRLMODE_LISTENONLY |
766 CAN_CTRLMODE_3_SAMPLES |
767 CAN_CTRLMODE_FD |
768 CAN_CTRLMODE_FD_NON_ISO |
769 CAN_CTRLMODE_BERR_REPORTING;
770
771 priv->ndev = ndev;
772 priv->index = index;
773 priv->cmd_len = 0;
774 spin_lock_init(&priv->echo_lock);
775
776 ndev->flags |= IFF_ECHO;
777 ndev->netdev_ops = &peak_canfd_netdev_ops;
778 ndev->dev_id = index;
779
780 return ndev;
781}