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 */ 17 static 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 29 static 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 41 static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv) 42 { 43 priv->cmd_len = 0; 44 return priv; 45 } 46 47 static 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 65 static 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 */ 86 static 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 92 static 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 } 103 104 static 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 } 115 116 static 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 } 138 139 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 static 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 */ 250 static 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 */ 322 static 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 */ 332 static 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 */ 415 static 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 */ 444 int 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; 475 476 exit: 477 return msg_size; 478 } 479 480 /* handle a list of rx_count messages from rx_msg memory address */ 481 int 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 } 502 503 static 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); 520 521 err_exit: 522 return err; 523 } 524 525 static 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 } 539 540 static 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 } 555 556 static 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 } 564 565 static 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; 607 608 err_close: 609 close_candev(ndev); 610 err_exit: 611 return err; 612 } 613 614 static 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 } 620 621 static 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 } 627 628 static 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 } 638 639 static 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 } 743 744 static 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 }; 750 751 struct 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 } 795