1 // SPDX-License-Identifier: GPL-2.0-or-later
46 	/* Tx */
65 	rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT);  in liteeth_rx()
66 	len = litex_read32(priv->base + LITEETH_WRITER_LENGTH);  in liteeth_rx()
78 	memcpy_fromio(data, priv->rx_base + rx_slot * priv->slot_size, len);  in liteeth_rx()
79 	skb->protocol = eth_type_trans(skb, netdev);  in liteeth_rx()
86 	netdev->stats.rx_dropped++;  in liteeth_rx()
87 	netdev->stats.rx_errors++;  in liteeth_rx()
98 	reg = litex_read8(priv->base + LITEETH_READER_EV_PENDING);  in liteeth_interrupt()
102 		litex_write8(priv->base + LITEETH_READER_EV_PENDING, reg);  in liteeth_interrupt()
105 	reg = litex_read8(priv->base + LITEETH_WRITER_EV_PENDING);  in liteeth_interrupt()
108 		litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, reg);  in liteeth_interrupt()
120 	litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);  in liteeth_open()
121 	litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1);  in liteeth_open()
123 	err = request_irq(netdev->irq, liteeth_interrupt, 0, netdev->name, netdev);  in liteeth_open()
125 		netdev_err(netdev, "failed to request irq %d\n", netdev->irq);  in liteeth_open()
130 	litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 1);  in liteeth_open()
131 	litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 1);  in liteeth_open()
146 	litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0);  in liteeth_stop()
147 	litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0);  in liteeth_stop()
149 	free_irq(netdev->irq, netdev);  in liteeth_stop()
160 	if (!litex_read8(priv->base + LITEETH_READER_READY)) {  in liteeth_start_xmit()
170 	if (unlikely(skb->len > priv->slot_size)) {  in liteeth_start_xmit()
172 			netdev_err(netdev, "tx packet too big\n");  in liteeth_start_xmit()
175 		netdev->stats.tx_dropped++;  in liteeth_start_xmit()
176 		netdev->stats.tx_errors++;  in liteeth_start_xmit()
181 	txbuffer = priv->tx_base + priv->tx_slot * priv->slot_size;  in liteeth_start_xmit()
182 	memcpy_toio(txbuffer, skb->data, skb->len);  in liteeth_start_xmit()
183 	litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot);  in liteeth_start_xmit()
184 	litex_write16(priv->base + LITEETH_READER_LENGTH, skb->len);  in liteeth_start_xmit()
185 	litex_write8(priv->base + LITEETH_READER_START, 1);  in liteeth_start_xmit()
187 	dev_sw_netstats_tx_add(netdev, 1, skb->len);  in liteeth_start_xmit()
189 	priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots;  in liteeth_start_xmit()
198 	netdev_stats_to_stats64(stats, &netdev->stats);  in liteeth_get_stats64()
199 	dev_fetch_sw_netstats(stats, netdev->tstats);  in liteeth_get_stats64()
211 	struct device_node *np = priv->dev->of_node;  in liteeth_setup_slots()
214 	err = of_property_read_u32(np, "litex,rx-slots", &priv->num_rx_slots);  in liteeth_setup_slots()
216 		dev_dbg(priv->dev, "unable to get litex,rx-slots, using 2\n");  in liteeth_setup_slots()
217 		priv->num_rx_slots = 2;  in liteeth_setup_slots()
220 	err = of_property_read_u32(np, "litex,tx-slots", &priv->num_tx_slots);  in liteeth_setup_slots()
222 		dev_dbg(priv->dev, "unable to get litex,tx-slots, using 2\n");  in liteeth_setup_slots()
223 		priv->num_tx_slots = 2;  in liteeth_setup_slots()
226 	err = of_property_read_u32(np, "litex,slot-size", &priv->slot_size);  in liteeth_setup_slots()
228 		dev_dbg(priv->dev, "unable to get litex,slot-size, using 0x800\n");  in liteeth_setup_slots()
229 		priv->slot_size = 0x800;  in liteeth_setup_slots()
240 	netdev = devm_alloc_etherdev(&pdev->dev, sizeof(*priv));  in liteeth_probe()
242 		return -ENOMEM;  in liteeth_probe()
244 	SET_NETDEV_DEV(netdev, &pdev->dev);  in liteeth_probe()
248 	priv->netdev = netdev;  in liteeth_probe()
249 	priv->dev = &pdev->dev;  in liteeth_probe()
251 	netdev->tstats = devm_netdev_alloc_pcpu_stats(&pdev->dev,  in liteeth_probe()
253 	if (!netdev->tstats)  in liteeth_probe()
254 		return -ENOMEM;  in liteeth_probe()
259 	netdev->irq = irq;  in liteeth_probe()
261 	priv->base = devm_platform_ioremap_resource_byname(pdev, "mac");  in liteeth_probe()
262 	if (IS_ERR(priv->base))  in liteeth_probe()
263 		return PTR_ERR(priv->base);  in liteeth_probe()
271 	/* Rx slots */  in liteeth_probe()
272 	priv->rx_base = buf_base;  in liteeth_probe()
273 	priv->rx_slot = 0;  in liteeth_probe()
275 	/* Tx slots come after Rx slots */  in liteeth_probe()
276 	priv->tx_base = buf_base + priv->num_rx_slots * priv->slot_size;  in liteeth_probe()
277 	priv->tx_slot = 0;  in liteeth_probe()
279 	err = of_get_ethdev_address(pdev->dev.of_node, netdev);  in liteeth_probe()
283 	netdev->netdev_ops = &liteeth_netdev_ops;  in liteeth_probe()
287 		dev_err(&pdev->dev, "Failed to register netdev %d\n", err);  in liteeth_probe()
291 	netdev_info(netdev, "irq %d slots: tx %d rx %d size %d\n",  in liteeth_probe()
292 		    netdev->irq, priv->num_tx_slots, priv->num_rx_slots, priv->slot_size);  in liteeth_probe()