800 строки
19 KiB
C
800 строки
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
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* Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
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*
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* Copyright (C) 2016 PEAK System-Technik GmbH
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*/
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include "peak_canfd_user.h"
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/* internal IP core cache size (used as default echo skbs max number) */
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#define PCANFD_ECHO_SKB_MAX 24
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/* bittiming ranges of the PEAK-System PC CAN-FD interfaces */
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static const struct can_bittiming_const peak_canfd_nominal_const = {
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.name = "peak_canfd",
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.tseg1_min = 1,
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.tseg1_max = (1 << PUCAN_TSLOW_TSGEG1_BITS),
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.tseg2_min = 1,
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.tseg2_max = (1 << PUCAN_TSLOW_TSGEG2_BITS),
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.sjw_max = (1 << PUCAN_TSLOW_SJW_BITS),
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.brp_min = 1,
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.brp_max = (1 << PUCAN_TSLOW_BRP_BITS),
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.brp_inc = 1,
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};
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static const struct can_bittiming_const peak_canfd_data_const = {
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.name = "peak_canfd",
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.tseg1_min = 1,
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.tseg1_max = (1 << PUCAN_TFAST_TSGEG1_BITS),
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.tseg2_min = 1,
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.tseg2_max = (1 << PUCAN_TFAST_TSGEG2_BITS),
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.sjw_max = (1 << PUCAN_TFAST_SJW_BITS),
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.brp_min = 1,
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.brp_max = (1 << PUCAN_TFAST_BRP_BITS),
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.brp_inc = 1,
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};
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static struct peak_canfd_priv *pucan_init_cmd(struct peak_canfd_priv *priv)
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{
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priv->cmd_len = 0;
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return priv;
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}
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static void *pucan_add_cmd(struct peak_canfd_priv *priv, int cmd_op)
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{
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struct pucan_command *cmd;
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if (priv->cmd_len + sizeof(*cmd) > priv->cmd_maxlen)
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return NULL;
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cmd = priv->cmd_buffer + priv->cmd_len;
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/* reset all unused bit to default */
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memset(cmd, 0, sizeof(*cmd));
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cmd->opcode_channel = pucan_cmd_opcode_channel(priv->index, cmd_op);
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priv->cmd_len += sizeof(*cmd);
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return cmd;
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}
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static int pucan_write_cmd(struct peak_canfd_priv *priv)
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{
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int err;
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if (priv->pre_cmd) {
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err = priv->pre_cmd(priv);
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if (err)
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return err;
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}
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err = priv->write_cmd(priv);
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if (err)
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return err;
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if (priv->post_cmd)
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err = priv->post_cmd(priv);
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return err;
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}
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/* uCAN commands interface functions */
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static int pucan_set_reset_mode(struct peak_canfd_priv *priv)
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{
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pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RESET_MODE);
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return pucan_write_cmd(priv);
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}
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static int pucan_set_normal_mode(struct peak_canfd_priv *priv)
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{
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int err;
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pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_NORMAL_MODE);
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err = pucan_write_cmd(priv);
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if (!err)
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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return err;
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}
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static int pucan_set_listen_only_mode(struct peak_canfd_priv *priv)
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{
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int err;
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pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_LISTEN_ONLY_MODE);
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err = pucan_write_cmd(priv);
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if (!err)
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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return err;
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}
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static int pucan_set_timing_slow(struct peak_canfd_priv *priv,
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const struct can_bittiming *pbt)
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{
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struct pucan_timing_slow *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_SLOW);
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cmd->sjw_t = PUCAN_TSLOW_SJW_T(pbt->sjw - 1,
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priv->can.ctrlmode &
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CAN_CTRLMODE_3_SAMPLES);
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cmd->tseg1 = PUCAN_TSLOW_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
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cmd->tseg2 = PUCAN_TSLOW_TSEG2(pbt->phase_seg2 - 1);
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cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(pbt->brp - 1));
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cmd->ewl = 96; /* default */
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netdev_dbg(priv->ndev,
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"nominal: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
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le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw_t);
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return pucan_write_cmd(priv);
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}
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static int pucan_set_timing_fast(struct peak_canfd_priv *priv,
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const struct can_bittiming *pbt)
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{
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struct pucan_timing_fast *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TIMING_FAST);
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cmd->sjw = PUCAN_TFAST_SJW(pbt->sjw - 1);
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cmd->tseg1 = PUCAN_TFAST_TSEG1(pbt->prop_seg + pbt->phase_seg1 - 1);
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cmd->tseg2 = PUCAN_TFAST_TSEG2(pbt->phase_seg2 - 1);
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cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(pbt->brp - 1));
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netdev_dbg(priv->ndev,
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"data: brp=%u tseg1=%u tseg2=%u sjw=%u\n",
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le16_to_cpu(cmd->brp), cmd->tseg1, cmd->tseg2, cmd->sjw);
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return pucan_write_cmd(priv);
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}
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static int pucan_set_std_filter(struct peak_canfd_priv *priv, u8 row, u32 mask)
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{
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struct pucan_std_filter *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_STD_FILTER);
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/* all the 11-bits CAN ID values are represented by one bit in a
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* 64 rows array of 32 bits: the upper 6 bits of the CAN ID select the
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* row while the lowest 5 bits select the bit in that row.
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*
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* bit filter
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* 1 passed
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* 0 discarded
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*/
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/* select the row */
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cmd->idx = row;
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/* set/unset bits in the row */
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cmd->mask = cpu_to_le32(mask);
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return pucan_write_cmd(priv);
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}
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static int pucan_tx_abort(struct peak_canfd_priv *priv, u16 flags)
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{
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struct pucan_tx_abort *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_TX_ABORT);
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cmd->flags = cpu_to_le16(flags);
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return pucan_write_cmd(priv);
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}
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static int pucan_clr_err_counters(struct peak_canfd_priv *priv)
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{
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struct pucan_wr_err_cnt *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_WR_ERR_CNT);
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cmd->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE | PUCAN_WRERRCNT_RE);
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cmd->tx_counter = 0;
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cmd->rx_counter = 0;
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return pucan_write_cmd(priv);
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}
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static int pucan_set_options(struct peak_canfd_priv *priv, u16 opt_mask)
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{
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struct pucan_options *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_SET_EN_OPTION);
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cmd->options = cpu_to_le16(opt_mask);
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return pucan_write_cmd(priv);
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}
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static int pucan_clr_options(struct peak_canfd_priv *priv, u16 opt_mask)
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{
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struct pucan_options *cmd;
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cmd = pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_CLR_DIS_OPTION);
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cmd->options = cpu_to_le16(opt_mask);
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return pucan_write_cmd(priv);
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}
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static int pucan_setup_rx_barrier(struct peak_canfd_priv *priv)
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{
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pucan_add_cmd(pucan_init_cmd(priv), PUCAN_CMD_RX_BARRIER);
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return pucan_write_cmd(priv);
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}
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static int pucan_netif_rx(struct sk_buff *skb, __le32 ts_low, __le32 ts_high)
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{
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struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
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u64 ts_us;
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ts_us = (u64)le32_to_cpu(ts_high) << 32;
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ts_us |= le32_to_cpu(ts_low);
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/* IP core timestamps are µs. */
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hwts->hwtstamp = ns_to_ktime(ts_us * NSEC_PER_USEC);
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return netif_rx(skb);
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}
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/* handle the reception of one CAN frame */
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static int pucan_handle_can_rx(struct peak_canfd_priv *priv,
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struct pucan_rx_msg *msg)
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{
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struct net_device_stats *stats = &priv->ndev->stats;
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struct canfd_frame *cf;
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struct sk_buff *skb;
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const u16 rx_msg_flags = le16_to_cpu(msg->flags);
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u8 cf_len;
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if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN)
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cf_len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(msg)));
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else
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cf_len = get_can_dlc(pucan_msg_get_dlc(msg));
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/* if this frame is an echo, */
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if (rx_msg_flags & PUCAN_MSG_LOOPED_BACK) {
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unsigned long flags;
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spin_lock_irqsave(&priv->echo_lock, flags);
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can_get_echo_skb(priv->ndev, msg->client);
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/* count bytes of the echo instead of skb */
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stats->tx_bytes += cf_len;
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stats->tx_packets++;
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/* restart tx queue (a slot is free) */
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netif_wake_queue(priv->ndev);
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spin_unlock_irqrestore(&priv->echo_lock, flags);
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/* if this frame is only an echo, stop here. Otherwise,
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* continue to push this application self-received frame into
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* its own rx queue.
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*/
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if (!(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE))
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return 0;
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}
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/* otherwise, it should be pushed into rx fifo */
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if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
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/* CANFD frame case */
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skb = alloc_canfd_skb(priv->ndev, &cf);
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if (!skb)
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return -ENOMEM;
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if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
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cf->flags |= CANFD_BRS;
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if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
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cf->flags |= CANFD_ESI;
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} else {
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/* CAN 2.0 frame case */
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skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cf);
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if (!skb)
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return -ENOMEM;
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}
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cf->can_id = le32_to_cpu(msg->can_id);
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cf->len = cf_len;
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if (rx_msg_flags & PUCAN_MSG_EXT_ID)
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cf->can_id |= CAN_EFF_FLAG;
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if (rx_msg_flags & PUCAN_MSG_RTR)
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cf->can_id |= CAN_RTR_FLAG;
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else
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memcpy(cf->data, msg->d, cf->len);
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stats->rx_bytes += cf->len;
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stats->rx_packets++;
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pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
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return 0;
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}
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/* handle rx/tx error counters notification */
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static int pucan_handle_error(struct peak_canfd_priv *priv,
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struct pucan_error_msg *msg)
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{
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priv->bec.txerr = msg->tx_err_cnt;
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priv->bec.rxerr = msg->rx_err_cnt;
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return 0;
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}
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/* handle status notification */
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static int pucan_handle_status(struct peak_canfd_priv *priv,
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struct pucan_status_msg *msg)
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{
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struct net_device *ndev = priv->ndev;
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struct net_device_stats *stats = &ndev->stats;
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struct can_frame *cf;
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struct sk_buff *skb;
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/* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
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if (pucan_status_is_rx_barrier(msg)) {
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if (priv->enable_tx_path) {
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int err = priv->enable_tx_path(priv);
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if (err)
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return err;
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}
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/* start network queue (echo_skb array is empty) */
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netif_start_queue(ndev);
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return 0;
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}
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skb = alloc_can_err_skb(ndev, &cf);
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/* test state error bits according to their priority */
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if (pucan_status_is_busoff(msg)) {
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netdev_dbg(ndev, "Bus-off entry status\n");
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priv->can.state = CAN_STATE_BUS_OFF;
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priv->can.can_stats.bus_off++;
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can_bus_off(ndev);
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if (skb)
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cf->can_id |= CAN_ERR_BUSOFF;
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} else if (pucan_status_is_passive(msg)) {
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netdev_dbg(ndev, "Error passive status\n");
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priv->can.state = CAN_STATE_ERROR_PASSIVE;
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priv->can.can_stats.error_passive++;
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if (skb) {
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cf->can_id |= CAN_ERR_CRTL;
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cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
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CAN_ERR_CRTL_TX_PASSIVE :
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CAN_ERR_CRTL_RX_PASSIVE;
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cf->data[6] = priv->bec.txerr;
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cf->data[7] = priv->bec.rxerr;
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}
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} else if (pucan_status_is_warning(msg)) {
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netdev_dbg(ndev, "Error warning status\n");
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priv->can.state = CAN_STATE_ERROR_WARNING;
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priv->can.can_stats.error_warning++;
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if (skb) {
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cf->can_id |= CAN_ERR_CRTL;
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cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
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CAN_ERR_CRTL_TX_WARNING :
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CAN_ERR_CRTL_RX_WARNING;
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cf->data[6] = priv->bec.txerr;
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cf->data[7] = priv->bec.rxerr;
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}
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} else if (priv->can.state != CAN_STATE_ERROR_ACTIVE) {
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/* back to ERROR_ACTIVE */
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netdev_dbg(ndev, "Error active status\n");
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can_change_state(ndev, cf, CAN_STATE_ERROR_ACTIVE,
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CAN_STATE_ERROR_ACTIVE);
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} else {
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dev_kfree_skb(skb);
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return 0;
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}
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if (!skb) {
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stats->rx_dropped++;
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return -ENOMEM;
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}
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
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return 0;
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}
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/* handle uCAN Rx overflow notification */
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static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
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{
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struct net_device_stats *stats = &priv->ndev->stats;
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struct can_frame *cf;
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struct sk_buff *skb;
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stats->rx_over_errors++;
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stats->rx_errors++;
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skb = alloc_can_err_skb(priv->ndev, &cf);
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if (!skb) {
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stats->rx_dropped++;
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return -ENOMEM;
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}
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cf->can_id |= CAN_ERR_CRTL;
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cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
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cf->data[6] = priv->bec.txerr;
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cf->data[7] = priv->bec.rxerr;
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stats->rx_bytes += cf->can_dlc;
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stats->rx_packets++;
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netif_rx(skb);
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return 0;
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}
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/* handle a single uCAN message */
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int peak_canfd_handle_msg(struct peak_canfd_priv *priv,
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struct pucan_rx_msg *msg)
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{
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u16 msg_type = le16_to_cpu(msg->type);
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int msg_size = le16_to_cpu(msg->size);
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int err;
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if (!msg_size || !msg_type) {
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/* null packet found: end of list */
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goto exit;
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}
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switch (msg_type) {
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case PUCAN_MSG_CAN_RX:
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err = pucan_handle_can_rx(priv, (struct pucan_rx_msg *)msg);
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break;
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case PUCAN_MSG_ERROR:
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err = pucan_handle_error(priv, (struct pucan_error_msg *)msg);
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break;
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case PUCAN_MSG_STATUS:
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err = pucan_handle_status(priv, (struct pucan_status_msg *)msg);
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break;
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case PUCAN_MSG_CACHE_CRITICAL:
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err = pucan_handle_cache_critical(priv);
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break;
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default:
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err = 0;
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}
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if (err < 0)
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return err;
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exit:
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return msg_size;
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}
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/* handle a list of rx_count messages from rx_msg memory address */
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int peak_canfd_handle_msgs_list(struct peak_canfd_priv *priv,
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struct pucan_rx_msg *msg_list, int msg_count)
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{
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void *msg_ptr = msg_list;
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int i, msg_size = 0;
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|
|
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 += ALIGN(msg_size, 4);
|
|
}
|
|
|
|
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]);
|
|
|
|
/* 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);
|
|
|
|
spin_unlock_irqrestore(&priv->echo_lock, flags);
|
|
|
|
/* write the skb on the interface */
|
|
priv->write_tx_msg(priv, msg);
|
|
|
|
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;
|
|
}
|