1 // SPDX-License-Identifier: GPL-2.0
3 // mcp251xfd - Microchip MCP251xFD Family CAN controller driver
6 //               Marc Kleine-Budde <kernel@pengutronix.de>
26 	err = regmap_read(priv->map_reg, MCP251XFD_REG_TEFUA, &tef_ua);  in mcp251xfd_tef_tail_get_from_chip()
49 		netdev_err(priv->ndev,  in mcp251xfd_check_tef_tail()
52 		return -EILSEQ;  in mcp251xfd_check_tef_tail()
61 	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;  in mcp251xfd_handle_tefif_recover()
65 	err = regmap_read(priv->map_reg, MCP251XFD_REG_TEFSTA, &tef_sta);  in mcp251xfd_handle_tefif_recover()
70 		netdev_err(priv->ndev,  in mcp251xfd_handle_tefif_recover()
72 		return -ENOBUFS;  in mcp251xfd_handle_tefif_recover()
75 	netdev_info(priv->ndev,  in mcp251xfd_handle_tefif_recover()
80 		    seq, priv->tef->tail, priv->tef->head, tx_ring->head);  in mcp251xfd_handle_tefif_recover()
83 	return -EAGAIN;  in mcp251xfd_handle_tefif_recover()
91 	struct net_device_stats *stats = &priv->ndev->stats;  in mcp251xfd_handle_tefif_one()
96 			hw_tef_obj->flags);  in mcp251xfd_handle_tefif_one()
100 	 * net-yet-completed, i.e. old TEF objects.  in mcp251xfd_handle_tefif_one()
104 	tef_tail_masked = priv->tef->tail &  in mcp251xfd_handle_tefif_one()
110 	skb = priv->can.echo_skb[tef_tail];  in mcp251xfd_handle_tefif_one()
112 		mcp251xfd_skb_set_timestamp(priv, skb, hw_tef_obj->ts);  in mcp251xfd_handle_tefif_one()
113 	stats->tx_bytes +=  in mcp251xfd_handle_tefif_one()
114 		can_rx_offload_get_echo_skb(&priv->offload,  in mcp251xfd_handle_tefif_one()
115 					    tef_tail, hw_tef_obj->ts,  in mcp251xfd_handle_tefif_one()
117 	stats->tx_packets++;  in mcp251xfd_handle_tefif_one()
118 	priv->tef->tail++;  in mcp251xfd_handle_tefif_one()
125 	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;  in mcp251xfd_tef_ring_update()
134 	/* chip_tx_tail, is the next TX-Object send by the HW.  in mcp251xfd_tef_ring_update()
137 	new_head = round_down(priv->tef->head, tx_ring->obj_num) + chip_tx_tail;  in mcp251xfd_tef_ring_update()
138 	if (new_head <= priv->tef->head)  in mcp251xfd_tef_ring_update()
139 		new_head += tx_ring->obj_num;  in mcp251xfd_tef_ring_update()
141 	/* ... but it cannot exceed the TX head. */  in mcp251xfd_tef_ring_update()
142 	priv->tef->head = min(new_head, tx_ring->head);  in mcp251xfd_tef_ring_update()
152 	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;  in mcp251xfd_tef_obj_read()
153 	const int val_bytes = regmap_get_val_bytes(priv->map_rx);  in mcp251xfd_tef_obj_read()
156 	    (offset > tx_ring->obj_num ||  in mcp251xfd_tef_obj_read()
157 	     len > tx_ring->obj_num ||  in mcp251xfd_tef_obj_read()
158 	     offset + len > tx_ring->obj_num)) {  in mcp251xfd_tef_obj_read()
159 		netdev_err(priv->ndev,  in mcp251xfd_tef_obj_read()
160 			   "Trying to read too many TEF objects (max=%d, offset=%d, len=%d).\n",  in mcp251xfd_tef_obj_read()
161 			   tx_ring->obj_num, offset, len);  in mcp251xfd_tef_obj_read()
162 		return -ERANGE;  in mcp251xfd_tef_obj_read()
165 	return regmap_bulk_read(priv->map_rx,  in mcp251xfd_tef_obj_read()
173 	struct mcp251xfd_ecc *ecc = &priv->ecc;  in mcp251xfd_ecc_tefif_successful()
175 	ecc->ecc_stat = 0;  in mcp251xfd_ecc_tefif_successful()
197 		err = mcp251xfd_tef_obj_read(priv, &hw_tef_obj[l], 0, len - l);  in mcp251xfd_handle_tefif()
206 		/* -EAGAIN means the Sequence Number in the TEF  in mcp251xfd_handle_tefif()
211 		if (err == -EAGAIN)  in mcp251xfd_handle_tefif()
222 		struct mcp251xfd_tef_ring *ring = priv->tef;  in mcp251xfd_handle_tefif()
223 		struct mcp251xfd_tx_ring *tx_ring = priv->tx;  in mcp251xfd_handle_tefif()
235 		offset = ARRAY_SIZE(ring->uinc_xfer) - len;  in mcp251xfd_handle_tefif()
236 		err = spi_sync_transfer(priv->spi,  in mcp251xfd_handle_tefif()
237 					ring->uinc_xfer + offset, len);  in mcp251xfd_handle_tefif()
241 		tx_ring->tail += len;  in mcp251xfd_handle_tefif()
242 		netdev_completed_queue(priv->ndev, len, total_frame_len);  in mcp251xfd_handle_tefif()
251 	if (mcp251xfd_get_tx_free(priv->tx)) {  in mcp251xfd_handle_tefif()
253 		 * this sees the new tx_ring->tail.  in mcp251xfd_handle_tefif()
256 		netif_wake_queue(priv->ndev);  in mcp251xfd_handle_tefif()
259 	if (priv->tx_coalesce_usecs_irq)  in mcp251xfd_handle_tefif()
260 		hrtimer_start(&priv->tx_irq_timer,  in mcp251xfd_handle_tefif()
261 			      ns_to_ktime(priv->tx_coalesce_usecs_irq *  in mcp251xfd_handle_tefif()