841 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* 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 GmbH6 */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 2416 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 a166 * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the167 * row while the lowest 5 bits select the bit in that row.168 *169 * bit filter170 * 1 passed171 * 0 discarded172 */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 else263 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 into282 * 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 else521 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 else586 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-)restart661 * mechanism662 */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 echo722 * skb ring means that the controller did not write these frames on723 * 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 else732 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 kernel_ethtool_ts_info *info)781{782 info->so_timestamping =783 SOF_TIMESTAMPING_TX_SOFTWARE |784 SOF_TIMESTAMPING_RX_HARDWARE |785 SOF_TIMESTAMPING_RAW_HARDWARE;786 info->tx_types = BIT(HWTSTAMP_TX_OFF);787 info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);788 789 return 0;790}791 792static const struct ethtool_ops peak_canfd_ethtool_ops = {793 .get_ts_info = peak_get_ts_info,794};795 796struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index,797 int echo_skb_max)798{799 struct net_device *ndev;800 struct peak_canfd_priv *priv;801 802 /* we DO support local echo */803 if (echo_skb_max < 0)804 echo_skb_max = PCANFD_ECHO_SKB_MAX;805 806 /* allocate the candev object */807 ndev = alloc_candev(sizeof_priv, echo_skb_max);808 if (!ndev)809 return NULL;810 811 priv = netdev_priv(ndev);812 813 /* complete now socket-can initialization side */814 priv->can.state = CAN_STATE_STOPPED;815 priv->can.bittiming_const = &peak_canfd_nominal_const;816 priv->can.data_bittiming_const = &peak_canfd_data_const;817 818 priv->can.do_set_mode = peak_canfd_set_mode;819 priv->can.do_get_berr_counter = peak_canfd_get_berr_counter;820 priv->can.do_set_bittiming = peak_canfd_set_bittiming;821 priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming;822 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |823 CAN_CTRLMODE_LISTENONLY |824 CAN_CTRLMODE_3_SAMPLES |825 CAN_CTRLMODE_FD |826 CAN_CTRLMODE_FD_NON_ISO |827 CAN_CTRLMODE_BERR_REPORTING;828 829 priv->ndev = ndev;830 priv->index = index;831 priv->cmd_len = 0;832 spin_lock_init(&priv->echo_lock);833 834 ndev->flags |= IFF_ECHO;835 ndev->netdev_ops = &peak_canfd_netdev_ops;836 ndev->ethtool_ops = &peak_canfd_ethtool_ops;837 ndev->dev_id = index;838 839 return ndev;840}841