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 */ |
18 | static 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 | |
30 | static 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 | |
42 | static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv) |
43 | { |
44 | priv->cmd_len = 0; |
45 | return priv; |
46 | } |
47 | |
48 | static 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(index: priv->index, opcode: cmd_op); |
61 | priv->cmd_len += sizeof(*cmd); |
62 | |
63 | return cmd; |
64 | } |
65 | |
66 | static 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 */ |
87 | static int pucan_set_reset_mode(struct peak_canfd_priv *priv) |
88 | { |
89 | pucan_add_cmd(priv: pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE); |
90 | return pucan_write_cmd(priv); |
91 | } |
92 | |
93 | static int pucan_set_normal_mode(struct peak_canfd_priv *priv) |
94 | { |
95 | int err; |
96 | |
97 | pucan_add_cmd(priv: 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 | |
105 | static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv) |
106 | { |
107 | int err; |
108 | |
109 | pucan_add_cmd(priv: 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 | |
117 | static 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(priv: 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 | |
140 | static 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(priv: 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 | |
159 | static 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(priv: 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 | |
183 | static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags) |
184 | { |
185 | struct pucan_tx_abort *cmd; |
186 | |
187 | cmd = pucan_add_cmd(priv: 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 | |
194 | static int pucan_clr_err_counters(struct peak_canfd_priv *priv) |
195 | { |
196 | struct pucan_wr_err_cnt *cmd; |
197 | |
198 | cmd = pucan_add_cmd(priv: 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 | |
207 | static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask) |
208 | { |
209 | struct pucan_options *cmd; |
210 | |
211 | cmd = pucan_add_cmd(priv: 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 | |
218 | static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask) |
219 | { |
220 | struct pucan_options *cmd; |
221 | |
222 | cmd = pucan_add_cmd(priv: 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 | |
229 | static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv) |
230 | { |
231 | pucan_add_cmd(priv: pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER); |
232 | |
233 | return pucan_write_cmd(priv); |
234 | } |
235 | |
236 | static 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(ns: ts_us * NSEC_PER_USEC); |
246 | |
247 | return netif_rx(skb); |
248 | } |
249 | |
250 | /* handle the reception of one CAN frame */ |
251 | static 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(dlc: 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(dev: priv->ndev, idx: msg->client, NULL); |
273 | stats->tx_packets++; |
274 | |
275 | /* restart tx queue (a slot is free) */ |
276 | netif_wake_queue(dev: priv->ndev); |
277 | |
278 | spin_unlock_irqrestore(lock: &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(dev: priv->ndev, cfd: &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(dev: priv->ndev, cf: (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, ts_low: msg->ts_low, ts_high: msg->ts_high); |
323 | |
324 | return 0; |
325 | } |
326 | |
327 | /* handle rx/tx error counters notification */ |
328 | static 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 */ |
338 | static 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(dev: ndev); |
357 | |
358 | return 0; |
359 | } |
360 | |
361 | skb = alloc_can_err_skb(dev: ndev, cf: &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(dev: 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(dev: ndev, cf, tx_state: CAN_STATE_ERROR_ACTIVE, |
402 | rx_state: 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, ts_low: msg->ts_low, ts_high: msg->ts_high); |
414 | |
415 | return 0; |
416 | } |
417 | |
418 | /* handle uCAN Rx overflow notification */ |
419 | static 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(dev: priv->ndev, cf: &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 */ |
446 | int 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, msg: (struct pucan_rx_msg *)msg); |
461 | break; |
462 | case PUCAN_MSG_ERROR: |
463 | err = pucan_handle_error(priv, msg: (struct pucan_error_msg *)msg); |
464 | break; |
465 | case PUCAN_MSG_STATUS: |
466 | err = pucan_handle_status(priv, msg: (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 | |
478 | exit: |
479 | return msg_size; |
480 | } |
481 | |
482 | /* handle a list of rx_count messages from rx_msg memory address */ |
483 | int 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: 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 | |
505 | static 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 | |
523 | err_exit: |
524 | return err; |
525 | } |
526 | |
527 | static 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(dev: priv->ndev, format: "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 | |
542 | static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode) |
543 | { |
544 | struct peak_canfd_priv *priv = netdev_priv(dev: ndev); |
545 | |
546 | switch (mode) { |
547 | case CAN_MODE_START: |
548 | peak_canfd_start(priv); |
549 | netif_wake_queue(dev: ndev); |
550 | break; |
551 | default: |
552 | return -EOPNOTSUPP; |
553 | } |
554 | |
555 | return 0; |
556 | } |
557 | |
558 | static 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(dev: ndev); |
562 | |
563 | *bec = priv->bec; |
564 | return 0; |
565 | } |
566 | |
567 | static int peak_canfd_open(struct net_device *ndev) |
568 | { |
569 | struct peak_canfd_priv *priv = netdev_priv(dev: ndev); |
570 | int i, err = 0; |
571 | |
572 | err = open_candev(dev: ndev); |
573 | if (err) { |
574 | netdev_err(dev: ndev, format: "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, row: i, mask: 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 | |
610 | err_close: |
611 | close_candev(dev: ndev); |
612 | err_exit: |
613 | return err; |
614 | } |
615 | |
616 | static int peak_canfd_set_bittiming(struct net_device *ndev) |
617 | { |
618 | struct peak_canfd_priv *priv = netdev_priv(dev: ndev); |
619 | |
620 | return pucan_set_timing_slow(priv, pbt: &priv->can.bittiming); |
621 | } |
622 | |
623 | static int peak_canfd_set_data_bittiming(struct net_device *ndev) |
624 | { |
625 | struct peak_canfd_priv *priv = netdev_priv(dev: ndev); |
626 | |
627 | return pucan_set_timing_fast(priv, pbt: &priv->can.data_bittiming); |
628 | } |
629 | |
630 | static int peak_canfd_close(struct net_device *ndev) |
631 | { |
632 | struct peak_canfd_priv *priv = netdev_priv(dev: ndev); |
633 | |
634 | netif_stop_queue(dev: ndev); |
635 | peak_canfd_stop(priv); |
636 | close_candev(dev: ndev); |
637 | |
638 | return 0; |
639 | } |
640 | |
641 | static 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(dev: 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(dev: 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(dev: 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(len: 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, dev: ndev, idx: priv->echo_idx, frame_len: 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(dev: ndev); |
737 | |
738 | spin_unlock_irqrestore(lock: &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 | |
746 | static 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(to: &hwts_cfg, from: ifr->ifr_data, n: 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(to: ifr->ifr_data, from: &hwts_cfg, n: sizeof(hwts_cfg))) |
763 | return -EFAULT; |
764 | return 0; |
765 | |
766 | default: |
767 | return -EOPNOTSUPP; |
768 | } |
769 | } |
770 | |
771 | static 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 | |
779 | static 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 | |
795 | static const struct ethtool_ops peak_canfd_ethtool_ops = { |
796 | .get_ts_info = peak_get_ts_info, |
797 | }; |
798 | |
799 | struct 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(dev: 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 | } |
844 | |