diff options
Diffstat (limited to 'drivers/net/can/rockchip/rockchip_canfd-tx.c')
| -rw-r--r-- | drivers/net/can/rockchip/rockchip_canfd-tx.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/net/can/rockchip/rockchip_canfd-tx.c b/drivers/net/can/rockchip/rockchip_canfd-tx.c new file mode 100644 index 000000000000..865a15e033a9 --- /dev/null +++ b/drivers/net/can/rockchip/rockchip_canfd-tx.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2023, 2024 Pengutronix, +// Marc Kleine-Budde <kernel@pengutronix.de> +// + +#include <net/netdev_queues.h> + +#include "rockchip_canfd.h" + +static bool rkcanfd_tx_tail_is_eff(const struct rkcanfd_priv *priv) +{ + const struct canfd_frame *cfd; + const struct sk_buff *skb; + unsigned int tx_tail; + + if (!rkcanfd_get_tx_pending(priv)) + return false; + + tx_tail = rkcanfd_get_tx_tail(priv); + skb = priv->can.echo_skb[tx_tail]; + if (!skb) { + netdev_err(priv->ndev, + "%s: echo_skb[%u]=NULL tx_head=0x%08x tx_tail=0x%08x\n", + __func__, tx_tail, + priv->tx_head, priv->tx_tail); + + return false; + } + + cfd = (struct canfd_frame *)skb->data; + + return cfd->can_id & CAN_EFF_FLAG; +} + +unsigned int rkcanfd_get_effective_tx_free(const struct rkcanfd_priv *priv) +{ + if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_6 && + rkcanfd_tx_tail_is_eff(priv)) + return 0; + + return rkcanfd_get_tx_free(priv); +} + +static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv, + const u32 reg_cmd) +{ + if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12) + rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default | + RKCANFD_REG_MODE_SPACE_RX_MODE); + + rkcanfd_write(priv, RKCANFD_REG_CMD, reg_cmd); + + if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12) + rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default); +} + +void rkcanfd_xmit_retry(struct rkcanfd_priv *priv) +{ + const unsigned int tx_head = rkcanfd_get_tx_head(priv); + const u32 reg_cmd = RKCANFD_REG_CMD_TX_REQ(tx_head); + + rkcanfd_start_xmit_write_cmd(priv, reg_cmd); +} + +netdev_tx_t rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct rkcanfd_priv *priv = netdev_priv(ndev); + u32 reg_frameinfo, reg_id, reg_cmd; + unsigned int tx_head, frame_len; + const struct canfd_frame *cfd; + int err; + u8 i; + + if (can_dropped_invalid_skb(ndev, skb)) + return NETDEV_TX_OK; + + if (!netif_subqueue_maybe_stop(priv->ndev, 0, + rkcanfd_get_effective_tx_free(priv), + RKCANFD_TX_STOP_THRESHOLD, + RKCANFD_TX_START_THRESHOLD)) { + if (net_ratelimit()) + netdev_info(priv->ndev, + "Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, tx_pending=%d)\n", + priv->tx_head, priv->tx_tail, + rkcanfd_get_tx_pending(priv)); + + return NETDEV_TX_BUSY; + } + + cfd = (struct canfd_frame *)skb->data; + + if (cfd->can_id & CAN_EFF_FLAG) { + reg_frameinfo = RKCANFD_REG_FD_FRAMEINFO_FRAME_FORMAT; + reg_id = FIELD_PREP(RKCANFD_REG_FD_ID_EFF, cfd->can_id); + } else { + reg_frameinfo = 0; + reg_id = FIELD_PREP(RKCANFD_REG_FD_ID_SFF, cfd->can_id); + } + + if (cfd->can_id & CAN_RTR_FLAG) + reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_RTR; + + if (can_is_canfd_skb(skb)) { + reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_FDF; + + if (cfd->flags & CANFD_BRS) + reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_BRS; + + reg_frameinfo |= FIELD_PREP(RKCANFD_REG_FD_FRAMEINFO_DATA_LENGTH, + can_fd_len2dlc(cfd->len)); + } else { + reg_frameinfo |= FIELD_PREP(RKCANFD_REG_FD_FRAMEINFO_DATA_LENGTH, + cfd->len); + } + + tx_head = rkcanfd_get_tx_head(priv); + reg_cmd = RKCANFD_REG_CMD_TX_REQ(tx_head); + + rkcanfd_write(priv, RKCANFD_REG_FD_TXFRAMEINFO, reg_frameinfo); + rkcanfd_write(priv, RKCANFD_REG_FD_TXID, reg_id); + for (i = 0; i < cfd->len; i += 4) + rkcanfd_write(priv, RKCANFD_REG_FD_TXDATA0 + i, + *(u32 *)(cfd->data + i)); + + frame_len = can_skb_get_frame_len(skb); + err = can_put_echo_skb(skb, ndev, tx_head, frame_len); + if (!err) + netdev_sent_queue(priv->ndev, frame_len); + + WRITE_ONCE(priv->tx_head, priv->tx_head + 1); + + rkcanfd_start_xmit_write_cmd(priv, reg_cmd); + + netif_subqueue_maybe_stop(priv->ndev, 0, + rkcanfd_get_effective_tx_free(priv), + RKCANFD_TX_STOP_THRESHOLD, + RKCANFD_TX_START_THRESHOLD); + + return NETDEV_TX_OK; +} + +void rkcanfd_handle_tx_done_one(struct rkcanfd_priv *priv, const u32 ts, + unsigned int *frame_len_p) +{ + struct net_device_stats *stats = &priv->ndev->stats; + unsigned int tx_tail; + struct sk_buff *skb; + + tx_tail = rkcanfd_get_tx_tail(priv); + skb = priv->can.echo_skb[tx_tail]; + + /* Manual handling of CAN Bus Error counters. See + * rkcanfd_get_corrected_berr_counter() for detailed + * explanation. + */ + if (priv->bec.txerr) + priv->bec.txerr--; + + if (skb) + rkcanfd_skb_set_timestamp(priv, skb, ts); + stats->tx_bytes += + can_rx_offload_get_echo_skb_queue_timestamp(&priv->offload, + tx_tail, ts, + frame_len_p); + stats->tx_packets++; +} |