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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/* 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 */
17static 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
29static 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
41static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
42{
43 priv->cmd_len = 0;
44 return priv;
45}
46
47static 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
65static 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 */
86static 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
92static 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
104static 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
116static 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
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
235static 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 */
250static 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_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
261 else
262 cf_len = get_can_dlc(pucan_msg_get_dlc(msg));
263
264 /* if this frame is an echo, */
265 if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) &&
266 !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) {
267 unsigned long flags;
268
269 spin_lock_irqsave(&priv->echo_lock, flags);
270 can_get_echo_skb(priv->ndev, msg->client);
271
272 /* count bytes of the echo instead of skb */
273 stats->tx_bytes += cf_len;
274 stats->tx_packets++;
275
276 /* restart tx queue (a slot is free) */
277 netif_wake_queue(priv->ndev);
278
279 spin_unlock_irqrestore(&priv->echo_lock, flags);
280 return 0;
281 }
282
283 /* otherwise, it should be pushed into rx fifo */
284 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
285 /* CANFD frame case */
286 skb = alloc_canfd_skb(priv->ndev, &cf);
287 if (!skb)
288 return -ENOMEM;
289
290 if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
291 cf->flags |= CANFD_BRS;
292
293 if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
294 cf->flags |= CANFD_ESI;
295 } else {
296 /* CAN 2.0 frame case */
297 skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
298 if (!skb)
299 return -ENOMEM;
300 }
301
302 cf->can_id = le32_to_cpu(msg->can_id);
303 cf->len = cf_len;
304
305 if (rx_msg_flags & PUCAN_MSG_EXT_ID)
306 cf->can_id |= CAN_EFF_FLAG;
307
308 if (rx_msg_flags & PUCAN_MSG_RTR)
309 cf->can_id |= CAN_RTR_FLAG;
310 else
311 memcpy(cf->data, msg->d, cf->len);
312
313 stats->rx_bytes += cf->len;
314 stats->rx_packets++;
315
316 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
317
318 return 0;
319}
320
321/* handle rx/tx error counters notification */
322static int pucan_handle_error(struct peak_canfd_priv *priv,
323 struct pucan_error_msg *msg)
324{
325 priv->bec.txerr = msg->tx_err_cnt;
326 priv->bec.rxerr = msg->rx_err_cnt;
327
328 return 0;
329}
330
331/* handle status notification */
332static int pucan_handle_status(struct peak_canfd_priv *priv,
333 struct pucan_status_msg *msg)
334{
335 struct net_device *ndev = priv->ndev;
336 struct net_device_stats *stats = &ndev->stats;
337 struct can_frame *cf;
338 struct sk_buff *skb;
339
340 /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
341 if (pucan_status_is_rx_barrier(msg)) {
342 if (priv->enable_tx_path) {
343 int err = priv->enable_tx_path(priv);
344
345 if (err)
346 return err;
347 }
348
349 /* start network queue (echo_skb array is empty) */
350 netif_start_queue(ndev);
351
352 return 0;
353 }
354
355 skb = alloc_can_err_skb(ndev, &cf);
356
357 /* test state error bits according to their priority */
358 if (pucan_status_is_busoff(msg)) {
359 netdev_dbg(ndev, "Bus-off entry status\n");
360 priv->can.state = CAN_STATE_BUS_OFF;
361 priv->can.can_stats.bus_off++;
362 can_bus_off(ndev);
363 if (skb)
364 cf->can_id |= CAN_ERR_BUSOFF;
365
366 } else if (pucan_status_is_passive(msg)) {
367 netdev_dbg(ndev, "Error passive status\n");
368 priv->can.state = CAN_STATE_ERROR_PASSIVE;
369 priv->can.can_stats.error_passive++;
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_PASSIVE :
374 CAN_ERR_CRTL_RX_PASSIVE;
375 cf->data[6] = priv->bec.txerr;
376 cf->data[7] = priv->bec.rxerr;
377 }
378
379 } else if (pucan_status_is_warning(msg)) {
380 netdev_dbg(ndev, "Error warning status\n");
381 priv->can.state = CAN_STATE_ERROR_WARNING;
382 priv->can.can_stats.error_warning++;
383 if (skb) {
384 cf->can_id |= CAN_ERR_CRTL;
385 cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
386 CAN_ERR_CRTL_TX_WARNING :
387 CAN_ERR_CRTL_RX_WARNING;
388 cf->data[6] = priv->bec.txerr;
389 cf->data[7] = priv->bec.rxerr;
390 }
391
392 } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
393 /* back to ERROR_ACTIVE */
394 netdev_dbg(ndev, "Error active status\n");
395 can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
396 CAN_STATE_ERROR_ACTIVE);
397 } else {
398 dev_kfree_skb(skb);
399 return 0;
400 }
401
402 if (!skb) {
403 stats->rx_dropped++;
404 return -ENOMEM;
405 }
406
407 stats->rx_packets++;
408 stats->rx_bytes += cf->can_dlc;
409 pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
410
411 return 0;
412}
413
414/* handle uCAN Rx overflow notification */
415static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
416{
417 struct net_device_stats *stats = &priv->ndev->stats;
418 struct can_frame *cf;
419 struct sk_buff *skb;
420
421 stats->rx_over_errors++;
422 stats->rx_errors++;
423
424 skb = alloc_can_err_skb(priv->ndev, &cf);
425 if (!skb) {
426 stats->rx_dropped++;
427 return -ENOMEM;
428 }
429
430 cf->can_id |= CAN_ERR_CRTL;
431 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
432
433 cf->data[6] = priv->bec.txerr;
434 cf->data[7] = priv->bec.rxerr;
435
436 stats->rx_bytes += cf->can_dlc;
437 stats->rx_packets++;
438 netif_rx(skb);
439
440 return 0;
441}
442
443/* handle a single uCAN message */
444int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
445 struct pucan_rx_msg *msg)
446{
447 u16 msg_type = le16_to_cpu(msg->type);
448 int msg_size = le16_to_cpu(msg->size);
449 int err;
450
451 if (!msg_size || !msg_type) {
452 /* null packet found: end of list */
453 goto exit;
454 }
455
456 switch (msg_type) {
457 case PUCAN_MSG_CAN_RX:
458 err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
459 break;
460 case PUCAN_MSG_ERROR:
461 err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
462 break;
463 case PUCAN_MSG_STATUS:
464 err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
465 break;
466 case PUCAN_MSG_CACHE_CRITICAL:
467 err = pucan_handle_cache_critical(priv);
468 break;
469 default:
470 err = 0;
471 }
472
473 if (err < 0)
474 return err;
475
476exit:
477 return msg_size;
478}
479
480/* handle a list of rx_count messages from rx_msg memory address */
481int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
482 struct pucan_rx_msg *msg_list, int msg_count)
483{
484 void *msg_ptr = msg_list;
485 int i, msg_size = 0;
486
487 for (i = 0; i < msg_count; i++) {
488 msg_size = peak_canfd_handle_msg(priv, msg_ptr);
489
490 /* a null packet can be found at the end of a list */
491 if (msg_size <= 0)
492 break;
493
494 msg_ptr += ALIGN(msg_size, 4);
495 }
496
497 if (msg_size < 0)
498 return msg_size;
499
500 return i;
501}
502
503static int peak_canfd_start(struct peak_canfd_priv *priv)
504{
505 int err;
506
507 err = pucan_clr_err_counters(priv);
508 if (err)
509 goto err_exit;
510
511 priv->echo_idx = 0;
512
513 priv->bec.txerr = 0;
514 priv->bec.rxerr = 0;
515
516 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
517 err = pucan_set_listen_only_mode(priv);
518 else
519 err = pucan_set_normal_mode(priv);
520
521err_exit:
522 return err;
523}
524
525static void peak_canfd_stop(struct peak_canfd_priv *priv)
526{
527 int err;
528
529 /* go back to RESET mode */
530 err = pucan_set_reset_mode(priv);
531 if (err) {
532 netdev_err(priv->ndev, "channel %u reset failed\n",
533 priv->index);
534 } else {
535 /* abort last Tx (MUST be done in RESET mode only!) */
536 pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH);
537 }
538}
539
540static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
541{
542 struct peak_canfd_priv *priv = netdev_priv(ndev);
543
544 switch (mode) {
545 case CAN_MODE_START:
546 peak_canfd_start(priv);
547 netif_wake_queue(ndev);
548 break;
549 default:
550 return -EOPNOTSUPP;
551 }
552
553 return 0;
554}
555
556static int peak_canfd_get_berr_counter(const struct net_device *ndev,
557 struct can_berr_counter *bec)
558{
559 struct peak_canfd_priv *priv = netdev_priv(ndev);
560
561 *bec = priv->bec;
562 return 0;
563}
564
565static int peak_canfd_open(struct net_device *ndev)
566{
567 struct peak_canfd_priv *priv = netdev_priv(ndev);
568 int i, err = 0;
569
570 err = open_candev(ndev);
571 if (err) {
572 netdev_err(ndev, "open_candev() failed, error %d\n", err);
573 goto err_exit;
574 }
575
576 err = pucan_set_reset_mode(priv);
577 if (err)
578 goto err_close;
579
580 if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
581 if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
582 err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO);
583 else
584 err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO);
585
586 if (err)
587 goto err_close;
588 }
589
590 /* set option: get rx/tx error counters */
591 err = pucan_set_options(priv, PUCAN_OPTION_ERROR);
592 if (err)
593 goto err_close;
594
595 /* accept all standard CAN ID */
596 for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++)
597 pucan_set_std_filter(priv, i, 0xffffffff);
598
599 err = peak_canfd_start(priv);
600 if (err)
601 goto err_close;
602
603 /* receiving the RB status says when Tx path is ready */
604 err = pucan_setup_rx_barrier(priv);
605 if (!err)
606 goto err_exit;
607
608err_close:
609 close_candev(ndev);
610err_exit:
611 return err;
612}
613
614static int peak_canfd_set_bittiming(struct net_device *ndev)
615{
616 struct peak_canfd_priv *priv = netdev_priv(ndev);
617
618 return pucan_set_timing_slow(priv, &priv->can.bittiming);
619}
620
621static int peak_canfd_set_data_bittiming(struct net_device *ndev)
622{
623 struct peak_canfd_priv *priv = netdev_priv(ndev);
624
625 return pucan_set_timing_fast(priv, &priv->can.data_bittiming);
626}
627
628static int peak_canfd_close(struct net_device *ndev)
629{
630 struct peak_canfd_priv *priv = netdev_priv(ndev);
631
632 netif_stop_queue(ndev);
633 peak_canfd_stop(priv);
634 close_candev(ndev);
635
636 return 0;
637}
638
639static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb,
640 struct net_device *ndev)
641{
642 struct peak_canfd_priv *priv = netdev_priv(ndev);
643 struct net_device_stats *stats = &ndev->stats;
644 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
645 struct pucan_tx_msg *msg;
646 u16 msg_size, msg_flags;
647 unsigned long flags;
648 bool should_stop_tx_queue;
649 int room_left;
650 u8 can_dlc;
651
652 if (can_dropped_invalid_skb(ndev, skb))
653 return NETDEV_TX_OK;
654
655 msg_size = ALIGN(sizeof(*msg) + cf->len, 4);
656 msg = priv->alloc_tx_msg(priv, msg_size, &room_left);
657
658 /* should never happen except under bus-off condition and (auto-)restart
659 * mechanism
660 */
661 if (!msg) {
662 stats->tx_dropped++;
663 netif_stop_queue(ndev);
664 return NETDEV_TX_BUSY;
665 }
666
667 msg->size = cpu_to_le16(msg_size);
668 msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
669 msg_flags = 0;
670
671 if (cf->can_id & CAN_EFF_FLAG) {
672 msg_flags |= PUCAN_MSG_EXT_ID;
673 msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK);
674 } else {
675 msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK);
676 }
677
678 if (can_is_canfd_skb(skb)) {
679 /* CAN FD frame format */
680 can_dlc = can_len2dlc(cf->len);
681
682 msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
683
684 if (cf->flags & CANFD_BRS)
685 msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
686
687 if (cf->flags & CANFD_ESI)
688 msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
689 } else {
690 /* CAN 2.0 frame format */
691 can_dlc = cf->len;
692
693 if (cf->can_id & CAN_RTR_FLAG)
694 msg_flags |= PUCAN_MSG_RTR;
695 }
696
697 /* always ask loopback for echo management */
698 msg_flags |= PUCAN_MSG_LOOPED_BACK;
699
700 /* set driver specific bit to differentiate with application loopback */
701 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
702 msg_flags |= PUCAN_MSG_SELF_RECEIVE;
703
704 msg->flags = cpu_to_le16(msg_flags);
705 msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, can_dlc);
706 memcpy(msg->d, cf->data, cf->len);
707
708 /* struct msg client field is used as an index in the echo skbs ring */
709 msg->client = priv->echo_idx;
710
711 spin_lock_irqsave(&priv->echo_lock, flags);
712
713 /* prepare and save echo skb in internal slot */
714 can_put_echo_skb(skb, ndev, priv->echo_idx);
715
716 /* move echo index to the next slot */
717 priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max;
718
719 /* if next slot is not free, stop network queue (no slot free in echo
720 * skb ring means that the controller did not write these frames on
721 * the bus: no need to continue).
722 */
723 should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]);
724
725 /* stop network tx queue if not enough room to save one more msg too */
726 if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
727 should_stop_tx_queue |= (room_left <
728 (sizeof(*msg) + CANFD_MAX_DLEN));
729 else
730 should_stop_tx_queue |= (room_left <
731 (sizeof(*msg) + CAN_MAX_DLEN));
732
733 if (should_stop_tx_queue)
734 netif_stop_queue(ndev);
735
736 spin_unlock_irqrestore(&priv->echo_lock, flags);
737
738 /* write the skb on the interface */
739 priv->write_tx_msg(priv, msg);
740
741 return NETDEV_TX_OK;
742}
743
744static const struct net_device_ops peak_canfd_netdev_ops = {
745 .ndo_open = peak_canfd_open,
746 .ndo_stop = peak_canfd_close,
747 .ndo_start_xmit = peak_canfd_start_xmit,
748 .ndo_change_mtu = can_change_mtu,
749};
750
751struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,
752 int echo_skb_max)
753{
754 struct net_device *ndev;
755 struct peak_canfd_priv *priv;
756
757 /* we DO support local echo */
758 if (echo_skb_max < 0)
759 echo_skb_max = PCANFD_ECHO_SKB_MAX;
760
761 /* allocate the candev object */
762 ndev = alloc_candev(sizeof_priv, echo_skb_max);
763 if (!ndev)
764 return NULL;
765
766 priv = netdev_priv(ndev);
767
768 /* complete now socket-can initialization side */
769 priv->can.state = CAN_STATE_STOPPED;
770 priv->can.bittiming_const = &peak_canfd_nominal_const;
771 priv->can.data_bittiming_const = &peak_canfd_data_const;
772
773 priv->can.do_set_mode = peak_canfd_set_mode;
774 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;
775 priv->can.do_set_bittiming = peak_canfd_set_bittiming;
776 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;
777 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
778 CAN_CTRLMODE_LISTENONLY |
779 CAN_CTRLMODE_3_SAMPLES |
780 CAN_CTRLMODE_FD |
781 CAN_CTRLMODE_FD_NON_ISO |
782 CAN_CTRLMODE_BERR_REPORTING;
783
784 priv->ndev = ndev;
785 priv->index = index;
786 priv->cmd_len = 0;
787 spin_lock_init(&priv->echo_lock);
788
789 ndev->flags |= IFF_ECHO;
790 ndev->netdev_ops = &peak_canfd_netdev_ops;
791 ndev->dev_id = index;
792
793 return ndev;
794}