12  *   WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
15  *   LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
16  *   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17  *   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  *   kernel-based UART device; it is essentially an Ethernet-to-UART
34 #include <linux/of.h>
49 	spinlock_t lock;			/* transmit lock */  member
65 	struct net_device *netdev = qca->net_dev;  in qca_tty_receive()
66 	struct net_device_stats *n_stats = &netdev->stats;  in qca_tty_receive()
69 	if (!qca->rx_skb) {  in qca_tty_receive()
70 		qca->rx_skb = netdev_alloc_skb_ip_align(netdev,  in qca_tty_receive()
71 							netdev->mtu +  in qca_tty_receive()
73 		if (!qca->rx_skb) {  in qca_tty_receive()
74 			n_stats->rx_errors++;  in qca_tty_receive()
75 			n_stats->rx_dropped++;  in qca_tty_receive()
83 		retcode = qcafrm_fsm_decode(&qca->frm_handle,  in qca_tty_receive()
84 					    qca->rx_skb->data,  in qca_tty_receive()
85 					    skb_tailroom(qca->rx_skb),  in qca_tty_receive()
94 			n_stats->rx_errors++;  in qca_tty_receive()
95 			n_stats->rx_dropped++;  in qca_tty_receive()
99 			n_stats->rx_errors++;  in qca_tty_receive()
100 			n_stats->rx_dropped++;  in qca_tty_receive()
103 			n_stats->rx_packets++;  in qca_tty_receive()
104 			n_stats->rx_bytes += retcode;  in qca_tty_receive()
105 			skb_put(qca->rx_skb, retcode);  in qca_tty_receive()
106 			qca->rx_skb->protocol = eth_type_trans(  in qca_tty_receive()
107 						qca->rx_skb, qca->rx_skb->dev);  in qca_tty_receive()
108 			skb_checksum_none_assert(qca->rx_skb);  in qca_tty_receive()
109 			netif_rx(qca->rx_skb);  in qca_tty_receive()
110 			qca->rx_skb = netdev_alloc_skb_ip_align(netdev,  in qca_tty_receive()
111 								netdev->mtu +  in qca_tty_receive()
113 			if (!qca->rx_skb) {  in qca_tty_receive()
114 				netdev_dbg(netdev, "recv: out of RX resources\n");  in qca_tty_receive()
115 				n_stats->rx_errors++;  in qca_tty_receive()
128 	struct net_device_stats *n_stats = &qca->net_dev->stats;  in qcauart_transmit()
131 	spin_lock_bh(&qca->lock);  in qcauart_transmit()
134 	if (!netif_running(qca->net_dev)) {  in qcauart_transmit()
135 		spin_unlock_bh(&qca->lock);  in qcauart_transmit()
139 	if (qca->tx_left <= 0)  {  in qcauart_transmit()
141 		 * transmission of another packet  in qcauart_transmit()
143 		n_stats->tx_packets++;  in qcauart_transmit()
144 		spin_unlock_bh(&qca->lock);  in qcauart_transmit()
145 		netif_wake_queue(qca->net_dev);  in qcauart_transmit()
149 	written = serdev_device_write_buf(qca->serdev, qca->tx_head,  in qcauart_transmit()
150 					  qca->tx_left);  in qcauart_transmit()
152 		qca->tx_left -= written;  in qcauart_transmit()
153 		qca->tx_head += written;  in qcauart_transmit()
155 	spin_unlock_bh(&qca->lock);  in qcauart_transmit()
165 	schedule_work(&qca->tx_work);  in qca_tty_wakeup()
177 	netif_start_queue(qca->net_dev);  in qcauart_netdev_open()
187 	flush_work(&qca->tx_work);  in qcauart_netdev_close()
189 	spin_lock_bh(&qca->lock);  in qcauart_netdev_close()
190 	qca->tx_left = 0;  in qcauart_netdev_close()
191 	spin_unlock_bh(&qca->lock);  in qcauart_netdev_close()
199 	struct net_device_stats *n_stats = &dev->stats;  in qcauart_netdev_xmit()
205 	spin_lock(&qca->lock);  in qcauart_netdev_xmit()
207 	WARN_ON(qca->tx_left);  in qcauart_netdev_xmit()
210 		spin_unlock(&qca->lock);  in qcauart_netdev_xmit()
211 		netdev_warn(qca->net_dev, "xmit: iface is down\n");  in qcauart_netdev_xmit()
215 	pos = qca->tx_buffer;  in qcauart_netdev_xmit()
217 	if (skb->len < QCAFRM_MIN_LEN)  in qcauart_netdev_xmit()
218 		pad_len = QCAFRM_MIN_LEN - skb->len;  in qcauart_netdev_xmit()
220 	pos += qcafrm_create_header(pos, skb->len + pad_len);  in qcauart_netdev_xmit()
222 	memcpy(pos, skb->data, skb->len);  in qcauart_netdev_xmit()
223 	pos += skb->len;  in qcauart_netdev_xmit()
232 	netif_stop_queue(qca->net_dev);  in qcauart_netdev_xmit()
234 	written = serdev_device_write_buf(qca->serdev, qca->tx_buffer,  in qcauart_netdev_xmit()
235 					  pos - qca->tx_buffer);  in qcauart_netdev_xmit()
237 		qca->tx_left = (pos - qca->tx_buffer) - written;  in qcauart_netdev_xmit()
238 		qca->tx_head = qca->tx_buffer + written;  in qcauart_netdev_xmit()
239 		n_stats->tx_bytes += written;  in qcauart_netdev_xmit()
241 	spin_unlock(&qca->lock);  in qcauart_netdev_xmit()
253 	netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n",  in qcauart_netdev_tx_timeout()
255 	dev->stats.tx_errors++;  in qcauart_netdev_tx_timeout()
256 	dev->stats.tx_dropped++;  in qcauart_netdev_tx_timeout()
265 	dev->mtu = QCAFRM_MAX_MTU;  in qcauart_netdev_init()
266 	dev->type = ARPHRD_ETHER;  in qcauart_netdev_init()
269 	qca->tx_buffer = devm_kmalloc(&qca->serdev->dev, len, GFP_KERNEL);  in qcauart_netdev_init()
270 	if (!qca->tx_buffer)  in qcauart_netdev_init()
271 		return -ENOMEM;  in qcauart_netdev_init()
273 	qca->rx_skb = netdev_alloc_skb_ip_align(qca->net_dev,  in qcauart_netdev_init()
274 						qca->net_dev->mtu +  in qcauart_netdev_init()
276 	if (!qca->rx_skb)  in qcauart_netdev_init()
277 		return -ENOBUFS;  in qcauart_netdev_init()
286 	dev_kfree_skb(qca->rx_skb);  in qcauart_netdev_uninit()
302 	dev->netdev_ops = &qcauart_netdev_ops;  in qcauart_netdev_setup()
303 	dev->watchdog_timeo = QCAUART_TX_TIMEOUT;  in qcauart_netdev_setup()
304 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;  in qcauart_netdev_setup()
305 	dev->tx_queue_len = 100;  in qcauart_netdev_setup()
307 	/* MTU range: 46 - 1500 */  in qcauart_netdev_setup()
308 	dev->min_mtu = QCAFRM_MIN_MTU;  in qcauart_netdev_setup()
309 	dev->max_mtu = QCAFRM_MAX_MTU;  in qcauart_netdev_setup()
318 MODULE_DEVICE_TABLE(of, qca_uart_of_match);
328 		return -ENOMEM;  in qca_uart_probe()
331 	SET_NETDEV_DEV(qcauart_dev, &serdev->dev);  in qca_uart_probe()
336 		ret = -ENOMEM;  in qca_uart_probe()
339 	qca->net_dev = qcauart_dev;  in qca_uart_probe()
340 	qca->serdev = serdev;  in qca_uart_probe()
341 	qcafrm_fsm_init_uart(&qca->frm_handle);  in qca_uart_probe()
343 	spin_lock_init(&qca->lock);  in qca_uart_probe()
344 	INIT_WORK(&qca->tx_work, qcauart_transmit);  in qca_uart_probe()
346 	of_property_read_u32(serdev->dev.of_node, "current-speed", &speed);  in qca_uart_probe()
348 	ret = of_get_ethdev_address(serdev->dev.of_node, qca->net_dev);  in qca_uart_probe()
350 		eth_hw_addr_random(qca->net_dev);  in qca_uart_probe()
351 		dev_info(&serdev->dev, "Using random MAC address: %pM\n",  in qca_uart_probe()
352 			 qca->net_dev->dev_addr);  in qca_uart_probe()
355 	netif_carrier_on(qca->net_dev);  in qca_uart_probe()
361 		dev_err(&serdev->dev, "Unable to open device %s\n",  in qca_uart_probe()
362 			qcauart_dev->name);  in qca_uart_probe()
367 	dev_info(&serdev->dev, "Using baudrate: %u\n", speed);  in qca_uart_probe()
373 		dev_err(&serdev->dev, "Unable to register net device %s\n",  in qca_uart_probe()
374 			qcauart_dev->name);  in qca_uart_probe()
376 		cancel_work_sync(&qca->tx_work);  in qca_uart_probe()
391 	unregister_netdev(qca->net_dev);  in qca_uart_remove()
395 	cancel_work_sync(&qca->tx_work);  in qca_uart_remove()
397 	free_netdev(qca->net_dev);  in qca_uart_remove()