diff options
Diffstat (limited to 'drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c')
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c index d6d0d0f34893..4445653e7743 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c @@ -2069,193 +2069,6 @@ static irqreturn_t mcp251xfd_irq(int irq, void *dev_id) return handled; } -static inline struct -mcp251xfd_tx_obj *mcp251xfd_get_tx_obj_next(struct mcp251xfd_tx_ring *tx_ring) -{ - u8 tx_head; - - tx_head = mcp251xfd_get_tx_head(tx_ring); - - return &tx_ring->obj[tx_head]; -} - -static void -mcp251xfd_tx_obj_from_skb(const struct mcp251xfd_priv *priv, - struct mcp251xfd_tx_obj *tx_obj, - const struct sk_buff *skb, - unsigned int seq) -{ - const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; - struct mcp251xfd_hw_tx_obj_raw *hw_tx_obj; - union mcp251xfd_tx_obj_load_buf *load_buf; - u8 dlc; - u32 id, flags; - int len_sanitized = 0, len; - - if (cfd->can_id & CAN_EFF_FLAG) { - u32 sid, eid; - - sid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_SID_MASK, cfd->can_id); - eid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_EID_MASK, cfd->can_id); - - id = FIELD_PREP(MCP251XFD_OBJ_ID_EID_MASK, eid) | - FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, sid); - - flags = MCP251XFD_OBJ_FLAGS_IDE; - } else { - id = FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, cfd->can_id); - flags = 0; - } - - /* Use the MCP2518FD mask even on the MCP2517FD. It doesn't - * harm, only the lower 7 bits will be transferred into the - * TEF object. - */ - flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_SEQ_MCP2518FD_MASK, seq); - - if (cfd->can_id & CAN_RTR_FLAG) - flags |= MCP251XFD_OBJ_FLAGS_RTR; - else - len_sanitized = canfd_sanitize_len(cfd->len); - - /* CANFD */ - if (can_is_canfd_skb(skb)) { - if (cfd->flags & CANFD_ESI) - flags |= MCP251XFD_OBJ_FLAGS_ESI; - - flags |= MCP251XFD_OBJ_FLAGS_FDF; - - if (cfd->flags & CANFD_BRS) - flags |= MCP251XFD_OBJ_FLAGS_BRS; - - dlc = can_fd_len2dlc(cfd->len); - } else { - dlc = can_get_cc_dlc((struct can_frame *)cfd, - priv->can.ctrlmode); - } - - flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_DLC_MASK, dlc); - - load_buf = &tx_obj->buf; - if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) - hw_tx_obj = &load_buf->crc.hw_tx_obj; - else - hw_tx_obj = &load_buf->nocrc.hw_tx_obj; - - put_unaligned_le32(id, &hw_tx_obj->id); - put_unaligned_le32(flags, &hw_tx_obj->flags); - - /* Copy data */ - memcpy(hw_tx_obj->data, cfd->data, cfd->len); - - /* Clear unused data at end of CAN frame */ - if (MCP251XFD_SANITIZE_CAN && len_sanitized) { - int pad_len; - - pad_len = len_sanitized - cfd->len; - if (pad_len) - memset(hw_tx_obj->data + cfd->len, 0x0, pad_len); - } - - /* Number of bytes to be written into the RAM of the controller */ - len = sizeof(hw_tx_obj->id) + sizeof(hw_tx_obj->flags); - if (MCP251XFD_SANITIZE_CAN) - len += round_up(len_sanitized, sizeof(u32)); - else - len += round_up(cfd->len, sizeof(u32)); - - if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) { - u16 crc; - - mcp251xfd_spi_cmd_crc_set_len_in_ram(&load_buf->crc.cmd, - len); - /* CRC */ - len += sizeof(load_buf->crc.cmd); - crc = mcp251xfd_crc16_compute(&load_buf->crc, len); - put_unaligned_be16(crc, (void *)load_buf + len); - - /* Total length */ - len += sizeof(load_buf->crc.crc); - } else { - len += sizeof(load_buf->nocrc.cmd); - } - - tx_obj->xfer[0].len = len; -} - -static int mcp251xfd_tx_obj_write(const struct mcp251xfd_priv *priv, - struct mcp251xfd_tx_obj *tx_obj) -{ - return spi_async(priv->spi, &tx_obj->msg); -} - -static bool mcp251xfd_tx_busy(const struct mcp251xfd_priv *priv, - struct mcp251xfd_tx_ring *tx_ring) -{ - if (mcp251xfd_get_tx_free(tx_ring) > 0) - return false; - - netif_stop_queue(priv->ndev); - - /* Memory barrier before checking tx_free (head and tail) */ - smp_mb(); - - if (mcp251xfd_get_tx_free(tx_ring) == 0) { - netdev_dbg(priv->ndev, - "Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, len=%d).\n", - tx_ring->head, tx_ring->tail, - tx_ring->head - tx_ring->tail); - - return true; - } - - netif_start_queue(priv->ndev); - - return false; -} - -static netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb, - struct net_device *ndev) -{ - struct mcp251xfd_priv *priv = netdev_priv(ndev); - struct mcp251xfd_tx_ring *tx_ring = priv->tx; - struct mcp251xfd_tx_obj *tx_obj; - unsigned int frame_len; - u8 tx_head; - int err; - - if (can_dropped_invalid_skb(ndev, skb)) - return NETDEV_TX_OK; - - if (mcp251xfd_tx_busy(priv, tx_ring)) - return NETDEV_TX_BUSY; - - tx_obj = mcp251xfd_get_tx_obj_next(tx_ring); - mcp251xfd_tx_obj_from_skb(priv, tx_obj, skb, tx_ring->head); - - /* Stop queue if we occupy the complete TX FIFO */ - tx_head = mcp251xfd_get_tx_head(tx_ring); - tx_ring->head++; - if (mcp251xfd_get_tx_free(tx_ring) == 0) - netif_stop_queue(ndev); - - 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); - - err = mcp251xfd_tx_obj_write(priv, tx_obj); - if (err) - goto out_err; - - return NETDEV_TX_OK; - - out_err: - netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err); - - return NETDEV_TX_OK; -} - static int mcp251xfd_open(struct net_device *ndev) { struct mcp251xfd_priv *priv = netdev_priv(ndev); |