diff options
Diffstat (limited to 'drivers/net/can/peak_canfd/peak_canfd.c')
-rw-r--r-- | drivers/net/can/peak_canfd/peak_canfd.c | 801 |
1 files changed, 801 insertions, 0 deletions
diff --git a/drivers/net/can/peak_canfd/peak_canfd.c b/drivers/net/can/peak_canfd/peak_canfd.c new file mode 100644 index 0000000..0d57be5 --- /dev/null +++ b/drivers/net/can/peak_canfd/peak_canfd.c @@ -0,0 +1,801 @@ +/* + * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com> + * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com> + * + * Copyright (C) 2016 PEAK System-Technik GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the version 2 of the GNU General Public License + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/can.h> +#include <linux/can/dev.h> + +#include "peak_canfd_user.h" + +/* internal IP core cache size (used as default echo skbs max number) */ +#define PCANFD_ECHO_SKB_MAX 24 + +/* bittiming ranges of the PEAK-System PC CAN-FD interfaces */ +static const struct can_bittiming_const peak_canfd_nominal_const = { + .name = "peak_canfd", + .tseg1_min = 1, + .tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS), + .tseg2_min = 1, + .tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS), + .sjw_max = (1 << PUCAN_TSLOW_SJW_BITS), + .brp_min = 1, + .brp_max = (1 << PUCAN_TSLOW_BRP_BITS), + .brp_inc = 1, +}; + +static const struct can_bittiming_const peak_canfd_data_const = { + .name = "peak_canfd", + .tseg1_min = 1, + .tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS), + .tseg2_min = 1, + .tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS), + .sjw_max = (1 << PUCAN_TFAST_SJW_BITS), + .brp_min = 1, + .brp_max = (1 << PUCAN_TFAST_BRP_BITS), + .brp_inc = 1, +}; + +static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv) +{ + priv->cmd_len = 0; + return priv; +} + +static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op) +{ + struct pucan_command *cmd; + + if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen) + return NULL; + + cmd = priv->cmd_buffer + priv->cmd_len; + + /* reset all unused bit to default */ + memset(cmd, 0, sizeof(*cmd)); + + cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op); + priv->cmd_len += sizeof(*cmd); + + return cmd; +} + +static int pucan_write_cmd(struct peak_canfd_priv *priv) +{ + int err; + + if (priv->pre_cmd) { + err = priv->pre_cmd(priv); + if (err) + return err; + } + + err = priv->write_cmd(priv); + if (err) + return err; + + if (priv->post_cmd) + err = priv->post_cmd(priv); + + return err; +} + +/* uCAN commands interface functions */ +static int pucan_set_reset_mode(struct peak_canfd_priv *priv) +{ + pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE); + return pucan_write_cmd(priv); +} + +static int pucan_set_normal_mode(struct peak_canfd_priv *priv) +{ + int err; + + pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE); + err = pucan_write_cmd(priv); + if (!err) + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + return err; +} + +static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv) +{ + int err; + + pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE); + err = pucan_write_cmd(priv); + if (!err) + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + return err; +} + +static int pucan_set_timing_slow(struct peak_canfd_priv *priv, + const struct can_bittiming *pbt) +{ + struct pucan_timing_slow *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW); + + cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1, + priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES); + cmd->tseg1 = PUCAN_TSLOW_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1); + cmd->tseg2 = PUCAN_TSLOW_TSEG2(pbt->phase_seg2 - 1); + cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(pbt->brp - 1)); + + cmd->ewl = 96; /* default */ + + netdev_dbg(priv->ndev, + "nominal: brp=%u tseg1=%u tseg2=%u sjw=%u\n", + le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw_t); + + return pucan_write_cmd(priv); +} + +static int pucan_set_timing_fast(struct peak_canfd_priv *priv, + const struct can_bittiming *pbt) +{ + struct pucan_timing_fast *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST); + + cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1); + cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1); + cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1); + cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1)); + + netdev_dbg(priv->ndev, + "data: brp=%u tseg1=%u tseg2=%u sjw=%u\n", + le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw); + + return pucan_write_cmd(priv); +} + +static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask) +{ + struct pucan_std_filter *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER); + + /* all the 11-bits CAN ID values are represented by one bit in a + * 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the + * row while the lowest 5 bits select the bit in that row. + * + * bit filter + * 1 passed + * 0 discarded + */ + + /* select the row */ + cmd->idx = row; + + /* set/unset bits in the row */ + cmd->mask = cpu_to_le32(mask); + + return pucan_write_cmd(priv); +} + +static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags) +{ + struct pucan_tx_abort *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT); + + cmd->flags = cpu_to_le16(flags); + + return pucan_write_cmd(priv); +} + +static int pucan_clr_err_counters(struct peak_canfd_priv *priv) +{ + struct pucan_wr_err_cnt *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT); + + cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE); + cmd->tx_counter = 0; + cmd->rx_counter = 0; + + return pucan_write_cmd(priv); +} + +static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask) +{ + struct pucan_options *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION); + + cmd->options = cpu_to_le16(opt_mask); + + return pucan_write_cmd(priv); +} + +static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask) +{ + struct pucan_options *cmd; + + cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION); + + cmd->options = cpu_to_le16(opt_mask); + + return pucan_write_cmd(priv); +} + +static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv) +{ + pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER); + + return pucan_write_cmd(priv); +} + +/* handle the reception of one CAN frame */ +static int pucan_handle_can_rx(struct peak_canfd_priv *priv, + struct pucan_rx_msg *msg) +{ + struct net_device_stats *stats = &priv->ndev->stats; + struct canfd_frame *cf; + struct sk_buff *skb; + const u16 rx_msg_flags = le16_to_cpu(msg->flags); + u8 cf_len; + + if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) + cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg))); + else + cf_len = get_can_dlc(pucan_msg_get_dlc(msg)); + + /* if this frame is an echo, */ + if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) && + !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) { + int n; + unsigned long flags; + + spin_lock_irqsave(&priv->echo_lock, flags); + n = can_get_echo_skb(priv->ndev, msg->client); + spin_unlock_irqrestore(&priv->echo_lock, flags); + + /* count bytes of the echo instead of skb */ + stats->tx_bytes += cf_len; + stats->tx_packets++; + + if (n) { + /* restart tx queue only if a slot is free */ + netif_wake_queue(priv->ndev); + } + + return 0; + } + + /* otherwise, it should be pushed into rx fifo */ + if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) { + /* CANFD frame case */ + skb = alloc_canfd_skb(priv->ndev, &cf); + if (!skb) + return -ENOMEM; + + if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH) + cf->flags |= CANFD_BRS; + + if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND) + cf->flags |= CANFD_ESI; + } else { + /* CAN 2.0 frame case */ + skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf); + if (!skb) + return -ENOMEM; + } + + cf->can_id = le32_to_cpu(msg->can_id); + cf->len = cf_len; + + if (rx_msg_flags & PUCAN_MSG_EXT_ID) + cf->can_id |= CAN_EFF_FLAG; + + if (rx_msg_flags & PUCAN_MSG_RTR) + cf->can_id |= CAN_RTR_FLAG; + else + memcpy(cf->data, msg->d, cf->len); + + stats->rx_bytes += cf->len; + stats->rx_packets++; + + netif_rx(skb); + + return 0; +} + +/* handle rx/tx error counters notification */ +static int pucan_handle_error(struct peak_canfd_priv *priv, + struct pucan_error_msg *msg) +{ + priv->bec.txerr = msg->tx_err_cnt; + priv->bec.rxerr = msg->rx_err_cnt; + + return 0; +} + +/* handle status notification */ +static int pucan_handle_status(struct peak_canfd_priv *priv, + struct pucan_status_msg *msg) +{ + struct net_device *ndev = priv->ndev; + struct net_device_stats *stats = &ndev->stats; + struct can_frame *cf; + struct sk_buff *skb; + + /* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */ + if (pucan_status_is_rx_barrier(msg)) { + unsigned long flags; + + if (priv->enable_tx_path) { + int err = priv->enable_tx_path(priv); + + if (err) + return err; + } + + /* restart network queue only if echo skb array is free */ + spin_lock_irqsave(&priv->echo_lock, flags); + + if (!priv->can.echo_skb[priv->echo_idx]) { + spin_unlock_irqrestore(&priv->echo_lock, flags); + + netif_wake_queue(ndev); + } else { + spin_unlock_irqrestore(&priv->echo_lock, flags); + } + + return 0; + } + + skb = alloc_can_err_skb(ndev, &cf); + + /* test state error bits according to their priority */ + if (pucan_status_is_busoff(msg)) { + netdev_dbg(ndev, "Bus-off entry status\n"); + priv->can.state = CAN_STATE_BUS_OFF; + priv->can.can_stats.bus_off++; + can_bus_off(ndev); + if (skb) + cf->can_id |= CAN_ERR_BUSOFF; + + } else if (pucan_status_is_passive(msg)) { + netdev_dbg(ndev, "Error passive status\n"); + priv->can.state = CAN_STATE_ERROR_PASSIVE; + priv->can.can_stats.error_passive++; + if (skb) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ? + CAN_ERR_CRTL_TX_PASSIVE : + CAN_ERR_CRTL_RX_PASSIVE; + cf->data[6] = priv->bec.txerr; + cf->data[7] = priv->bec.rxerr; + } + + } else if (pucan_status_is_warning(msg)) { + netdev_dbg(ndev, "Error warning status\n"); + priv->can.state = CAN_STATE_ERROR_WARNING; + priv->can.can_stats.error_warning++; + if (skb) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ? + CAN_ERR_CRTL_TX_WARNING : + CAN_ERR_CRTL_RX_WARNING; + cf->data[6] = priv->bec.txerr; + cf->data[7] = priv->bec.rxerr; + } + + } else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) { + /* back to ERROR_ACTIVE */ + netdev_dbg(ndev, "Error active status\n"); + can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE, + CAN_STATE_ERROR_ACTIVE); + } else { + dev_kfree_skb(skb); + return 0; + } + + if (!skb) { + stats->rx_dropped++; + return -ENOMEM; + } + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + netif_rx(skb); + + return 0; +} + +/* handle uCAN Rx overflow notification */ +static int pucan_handle_cache_critical(struct peak_canfd_priv *priv) +{ + struct net_device_stats *stats = &priv->ndev->stats; + struct can_frame *cf; + struct sk_buff *skb; + + stats->rx_over_errors++; + stats->rx_errors++; + + skb = alloc_can_err_skb(priv->ndev, &cf); + if (!skb) { + stats->rx_dropped++; + return -ENOMEM; + } + + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + + cf->data[6] = priv->bec.txerr; + cf->data[7] = priv->bec.rxerr; + + stats->rx_bytes += cf->can_dlc; + stats->rx_packets++; + netif_rx(skb); + + return 0; +} + +/* handle a single uCAN message */ +int peak_canfd_handle_msg(struct peak_canfd_priv *priv, + struct pucan_rx_msg *msg) +{ + u16 msg_type = le16_to_cpu(msg->type); + int msg_size = le16_to_cpu(msg->size); + int err; + + if (!msg_size || !msg_type) { + /* null packet found: end of list */ + goto exit; + } + + switch (msg_type) { + case PUCAN_MSG_CAN_RX: + err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg); + break; + case PUCAN_MSG_ERROR: + err = pucan_handle_error(priv, (struct pucan_error_msg *)msg); + break; + case PUCAN_MSG_STATUS: + err = pucan_handle_status(priv, (struct pucan_status_msg *)msg); + break; + case PUCAN_MSG_CACHE_CRITICAL: + err = pucan_handle_cache_critical(priv); + break; + default: + err = 0; + } + + if (err < 0) + return err; + +exit: + return msg_size; +} + +/* handle a list of rx_count messages from rx_msg memory address */ +int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv, + struct pucan_rx_msg *msg_list, int msg_count) +{ + void *msg_ptr = msg_list; + int i, msg_size; + + for (i = 0; i < msg_count; i++) { + msg_size = peak_canfd_handle_msg(priv, msg_ptr); + + /* a null packet can be found at the end of a list */ + if (msg_size <= 0) + break; + + msg_ptr += msg_size; + } + + if (msg_size < 0) + return msg_size; + + return i; +} + +static int peak_canfd_start(struct peak_canfd_priv *priv) +{ + int err; + + err = pucan_clr_err_counters(priv); + if (err) + goto err_exit; + + priv->echo_idx = 0; + + priv->bec.txerr = 0; + priv->bec.rxerr = 0; + + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) + err = pucan_set_listen_only_mode(priv); + else + err = pucan_set_normal_mode(priv); + +err_exit: + return err; +} + +static void peak_canfd_stop(struct peak_canfd_priv *priv) +{ + int err; + + /* go back to RESET mode */ + err = pucan_set_reset_mode(priv); + if (err) { + netdev_err(priv->ndev, "channel %u reset failed\n", + priv->index); + } else { + /* abort last Tx (MUST be done in RESET mode only!) */ + pucan_tx_abort(priv, PUCAN_TX_ABORT_FLUSH); + } +} + +static int peak_canfd_set_mode(struct net_device *ndev, enum can_mode mode) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + + switch (mode) { + case CAN_MODE_START: + peak_canfd_start(priv); + netif_wake_queue(ndev); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int peak_canfd_get_berr_counter(const struct net_device *ndev, + struct can_berr_counter *bec) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + + *bec = priv->bec; + return 0; +} + +static int peak_canfd_open(struct net_device *ndev) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + int i, err = 0; + + err = open_candev(ndev); + if (err) { + netdev_err(ndev, "open_candev() failed, error %d\n", err); + goto err_exit; + } + + err = pucan_set_reset_mode(priv); + if (err) + goto err_close; + + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) { + if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) + err = pucan_clr_options(priv, PUCAN_OPTION_CANDFDISO); + else + err = pucan_set_options(priv, PUCAN_OPTION_CANDFDISO); + + if (err) + goto err_close; + } + + /* set option: get rx/tx error counters */ + err = pucan_set_options(priv, PUCAN_OPTION_ERROR); + if (err) + goto err_close; + + /* accept all standard CAN ID */ + for (i = 0; i <= PUCAN_FLTSTD_ROW_IDX_MAX; i++) + pucan_set_std_filter(priv, i, 0xffffffff); + + err = peak_canfd_start(priv); + if (err) + goto err_close; + + /* receiving the RB status says when Tx path is ready */ + err = pucan_setup_rx_barrier(priv); + if (!err) + goto err_exit; + +err_close: + close_candev(ndev); +err_exit: + return err; +} + +static int peak_canfd_set_bittiming(struct net_device *ndev) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + + return pucan_set_timing_slow(priv, &priv->can.bittiming); +} + +static int peak_canfd_set_data_bittiming(struct net_device *ndev) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + + return pucan_set_timing_fast(priv, &priv->can.data_bittiming); +} + +static int peak_canfd_close(struct net_device *ndev) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + + netif_stop_queue(ndev); + peak_canfd_stop(priv); + close_candev(ndev); + + return 0; +} + +static netdev_tx_t peak_canfd_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + struct peak_canfd_priv *priv = netdev_priv(ndev); + struct net_device_stats *stats = &ndev->stats; + struct canfd_frame *cf = (struct canfd_frame *)skb->data; + struct pucan_tx_msg *msg; + u16 msg_size, msg_flags; + unsigned long flags; + bool should_stop_tx_queue; + int room_left; + u8 can_dlc; + + if (can_dropped_invalid_skb(ndev, skb)) + return NETDEV_TX_OK; + + msg_size = ALIGN(sizeof(*msg) + cf->len, 4); + msg = priv->alloc_tx_msg(priv, msg_size, &room_left); + + /* should never happen except under bus-off condition and (auto-)restart + * mechanism + */ + if (!msg) { + stats->tx_dropped++; + netif_stop_queue(ndev); + return NETDEV_TX_BUSY; + } + + msg->size = cpu_to_le16(msg_size); + msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX); + msg_flags = 0; + + if (cf->can_id & CAN_EFF_FLAG) { + msg_flags |= PUCAN_MSG_EXT_ID; + msg->can_id = cpu_to_le32(cf->can_id & CAN_EFF_MASK); + } else { + msg->can_id = cpu_to_le32(cf->can_id & CAN_SFF_MASK); + } + + if (can_is_canfd_skb(skb)) { + /* CAN FD frame format */ + can_dlc = can_len2dlc(cf->len); + + msg_flags |= PUCAN_MSG_EXT_DATA_LEN; + + if (cf->flags & CANFD_BRS) + msg_flags |= PUCAN_MSG_BITRATE_SWITCH; + + if (cf->flags & CANFD_ESI) + msg_flags |= PUCAN_MSG_ERROR_STATE_IND; + } else { + /* CAN 2.0 frame format */ + can_dlc = cf->len; + + if (cf->can_id & CAN_RTR_FLAG) + msg_flags |= PUCAN_MSG_RTR; + } + + /* always ask loopback for echo management */ + msg_flags |= PUCAN_MSG_LOOPED_BACK; + + /* set driver specific bit to differentiate with application loopback */ + if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) + msg_flags |= PUCAN_MSG_SELF_RECEIVE; + + msg->flags = cpu_to_le16(msg_flags); + msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(priv->index, can_dlc); + memcpy(msg->d, cf->data, cf->len); + + /* struct msg client field is used as an index in the echo skbs ring */ + msg->client = priv->echo_idx; + + spin_lock_irqsave(&priv->echo_lock, flags); + + /* prepare and save echo skb in internal slot */ + can_put_echo_skb(skb, ndev, priv->echo_idx); + + /* move echo index to the next slot */ + priv->echo_idx = (priv->echo_idx + 1) % priv->can.echo_skb_max; + + /* if next slot is not free, stop network queue (no slot free in echo + * skb ring means that the controller did not write these frames on + * the bus: no need to continue). + */ + should_stop_tx_queue = !!(priv->can.echo_skb[priv->echo_idx]); + + spin_unlock_irqrestore(&priv->echo_lock, flags); + + /* write the skb on the interface */ + priv->write_tx_msg(priv, msg); + + /* stop network tx queue if not enough room to save one more msg too */ + if (priv->can.ctrlmode & CAN_CTRLMODE_FD) + should_stop_tx_queue |= (room_left < + (sizeof(*msg) + CANFD_MAX_DLEN)); + else + should_stop_tx_queue |= (room_left < + (sizeof(*msg) + CAN_MAX_DLEN)); + + if (should_stop_tx_queue) + netif_stop_queue(ndev); + + return NETDEV_TX_OK; +} + +static const struct net_device_ops peak_canfd_netdev_ops = { + .ndo_open = peak_canfd_open, + .ndo_stop = peak_canfd_close, + .ndo_start_xmit = peak_canfd_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +struct net_device *alloc_peak_canfd_dev(int sizeof_priv, int index, + int echo_skb_max) +{ + struct net_device *ndev; + struct peak_canfd_priv *priv; + + /* we DO support local echo */ + if (echo_skb_max < 0) + echo_skb_max = PCANFD_ECHO_SKB_MAX; + + /* allocate the candev object */ + ndev = alloc_candev(sizeof_priv, echo_skb_max); + if (!ndev) + return NULL; + + priv = netdev_priv(ndev); + + /* complete now socket-can initialization side */ + priv->can.state = CAN_STATE_STOPPED; + priv->can.bittiming_const = &peak_canfd_nominal_const; + priv->can.data_bittiming_const = &peak_canfd_data_const; + + priv->can.do_set_mode = peak_canfd_set_mode; + priv->can.do_get_berr_counter = peak_canfd_get_berr_counter; + priv->can.do_set_bittiming = peak_canfd_set_bittiming; + priv->can.do_set_data_bittiming = peak_canfd_set_data_bittiming; + priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | + CAN_CTRLMODE_LISTENONLY | + CAN_CTRLMODE_3_SAMPLES | + CAN_CTRLMODE_FD | + CAN_CTRLMODE_FD_NON_ISO | + CAN_CTRLMODE_BERR_REPORTING; + + priv->ndev = ndev; + priv->index = index; + priv->cmd_len = 0; + spin_lock_init(&priv->echo_lock); + + ndev->flags |= IFF_ECHO; + ndev->netdev_ops = &peak_canfd_netdev_ops; + ndev->dev_id = index; + + return ndev; +} |