1 // SPDX-License-Identifier: GPL-2.0
3 // mcp251xfd - Microchip MCP251xFD Family CAN controller driver
6 //               Marc Kleine-Budde <kernel@pengutronix.de>
10 // CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
27 	return &tx_ring->obj[tx_head];  in mcp251xfd_get_tx_obj_next()
36 	const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;  in mcp251xfd_tx_obj_from_skb()
43 	if (cfd->can_id & CAN_EFF_FLAG) {  in mcp251xfd_tx_obj_from_skb()
46 		sid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_SID_MASK, cfd->can_id);  in mcp251xfd_tx_obj_from_skb()
47 		eid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_EID_MASK, cfd->can_id);  in mcp251xfd_tx_obj_from_skb()
54 		id = FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, cfd->can_id);  in mcp251xfd_tx_obj_from_skb()
64 	if (cfd->can_id & CAN_RTR_FLAG)  in mcp251xfd_tx_obj_from_skb()
67 		len_sanitized = canfd_sanitize_len(cfd->len);  in mcp251xfd_tx_obj_from_skb()
71 		if (cfd->flags & CANFD_ESI)  in mcp251xfd_tx_obj_from_skb()
76 		if (cfd->flags & CANFD_BRS)  in mcp251xfd_tx_obj_from_skb()
79 		dlc = can_fd_len2dlc(cfd->len);  in mcp251xfd_tx_obj_from_skb()
82 				     priv->can.ctrlmode);  in mcp251xfd_tx_obj_from_skb()
87 	load_buf = &tx_obj->buf;  in mcp251xfd_tx_obj_from_skb()
88 	if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX)  in mcp251xfd_tx_obj_from_skb()
89 		hw_tx_obj = &load_buf->crc.hw_tx_obj;  in mcp251xfd_tx_obj_from_skb()
91 		hw_tx_obj = &load_buf->nocrc.hw_tx_obj;  in mcp251xfd_tx_obj_from_skb()
93 	put_unaligned_le32(id, &hw_tx_obj->id);  in mcp251xfd_tx_obj_from_skb()
94 	put_unaligned_le32(flags, &hw_tx_obj->flags);  in mcp251xfd_tx_obj_from_skb()
97 	memcpy(hw_tx_obj->data, cfd->data, cfd->len);  in mcp251xfd_tx_obj_from_skb()
103 		pad_len = len_sanitized - cfd->len;  in mcp251xfd_tx_obj_from_skb()
105 			memset(hw_tx_obj->data + cfd->len, 0x0, pad_len);  in mcp251xfd_tx_obj_from_skb()
109 	len = sizeof(hw_tx_obj->id) + sizeof(hw_tx_obj->flags);  in mcp251xfd_tx_obj_from_skb()
113 		len += round_up(cfd->len, sizeof(u32));  in mcp251xfd_tx_obj_from_skb()
115 	if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) {  in mcp251xfd_tx_obj_from_skb()
116 		u16 crc;  in mcp251xfd_tx_obj_from_skb()  local
118 		mcp251xfd_spi_cmd_crc_set_len_in_ram(&load_buf->crc.cmd,  in mcp251xfd_tx_obj_from_skb()
120 		/* CRC */  in mcp251xfd_tx_obj_from_skb()
121 		len += sizeof(load_buf->crc.cmd);  in mcp251xfd_tx_obj_from_skb()
122 		crc = mcp251xfd_crc16_compute(&load_buf->crc, len);  in mcp251xfd_tx_obj_from_skb()
123 		put_unaligned_be16(crc, (void *)load_buf + len);  in mcp251xfd_tx_obj_from_skb()
126 		len += sizeof(load_buf->crc.crc);  in mcp251xfd_tx_obj_from_skb()
128 		len += sizeof(load_buf->nocrc.cmd);  in mcp251xfd_tx_obj_from_skb()
131 	tx_obj->xfer[0].len = len;  in mcp251xfd_tx_obj_from_skb()
137 	return spi_async(priv->spi, &tx_obj->msg);  in mcp251xfd_tx_obj_write()
146 	netif_stop_queue(priv->ndev);  in mcp251xfd_tx_busy()
152 		netdev_dbg(priv->ndev,  in mcp251xfd_tx_busy()
153 			   "Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, len=%d).\n",  in mcp251xfd_tx_busy()
154 			   tx_ring->head, tx_ring->tail,  in mcp251xfd_tx_busy()
155 			   tx_ring->head - tx_ring->tail);  in mcp251xfd_tx_busy()
160 	netif_start_queue(priv->ndev);  in mcp251xfd_tx_busy()
169 	struct mcp251xfd_tx_ring *tx_ring = priv->tx;  in mcp251xfd_start_xmit()
182 	mcp251xfd_tx_obj_from_skb(priv, tx_obj, skb, tx_ring->head);  in mcp251xfd_start_xmit()
186 	tx_ring->head++;  in mcp251xfd_start_xmit()
193 		netdev_sent_queue(priv->ndev, frame_len);  in mcp251xfd_start_xmit()
202 	netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err);  in mcp251xfd_start_xmit()