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 */ 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(priv->index, 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(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(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(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(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 } 138 139 static int pucan_set_timing_fast(struct peak_canfd_priv *priv, 140 const struct can_bittiming *pbt) 141 { 142 struct pucan_timing_fast *cmd; 143 144 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST); 145 146 cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1); 147 cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1); 148 cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1); 149 cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1)); 150 151 netdev_dbg(priv->ndev, 152 "data: brp=%u tseg1=%u tseg2=%u sjw=%u\n", 153 le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw); 154 155 return pucan_write_cmd(priv); 156 } 157 158 static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask) 159 { 160 struct pucan_std_filter *cmd; 161 162 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER); 163 164 /* all the 11-bits CAN ID values are represented by one bit in a 165 * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the 166 * row while the lowest 5 bits select the bit in that row. 167 * 168 * bit filter 169 * 1 passed 170 * 0 discarded 171 */ 172 173 /* select the row */ 174 cmd->idx = row; 175 176 /* set/unset bits in the row */ 177 cmd->mask = cpu_to_le32(mask); 178 179 return pucan_write_cmd(priv); 180 } 181 182 static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags) 183 { 184 struct pucan_tx_abort *cmd; 185 186 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT); 187 188 cmd->flags = cpu_to_le16(flags); 189 190 return pucan_write_cmd(priv); 191 } 192 193 static int pucan_clr_err_counters(struct peak_canfd_priv *priv) 194 { 195 struct pucan_wr_err_cnt *cmd; 196 197 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT); 198 199 cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE); 200 cmd->tx_counter = 0; 201 cmd->rx_counter = 0; 202 203 return pucan_write_cmd(priv); 204 } 205 206 static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask) 207 { 208 struct pucan_options *cmd; 209 210 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION); 211 212 cmd->options = cpu_to_le16(opt_mask); 213 214 return pucan_write_cmd(priv); 215 } 216 217 static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask) 218 { 219 struct pucan_options *cmd; 220 221 cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION); 222 223 cmd->options = cpu_to_le16(opt_mask); 224 225 return pucan_write_cmd(priv); 226 } 227 228 static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv) 229 { 230 pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER); 231 232 return pucan_write_cmd(priv); 233 } 234 235 /* handle the reception of one CAN frame */ 236 static 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 */ 308 static 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 */ 318 static 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 */ 402 static 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 */ 431 int 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; 462 463 exit: 464 return msg_size; 465 } 466 467 /* handle a list of rx_count messages from rx_msg memory address */ 468 int 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 } 489 490 static 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); 507 508 err_exit: 509 return err; 510 } 511 512 static 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 } 526 527 static 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 } 542 543 static 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 } 551 552 static 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; 594 595 err_close: 596 close_candev(ndev); 597 err_exit: 598 return err; 599 } 600 601 static 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 } 607 608 static 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 } 614 615 static 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 } 625 626 static 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 } 730 731 static 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 }; 737 738 struct 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 } 782