1 /*   This program is free software; you can redistribute it and/or modify
2  *   it under the terms of the GNU General Public License as published by
3  *   the Free Software Foundation; version 2 of the License
4  *
5  *   This program is distributed in the hope that it will be useful,
6  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
7  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
8  *   GNU General Public License for more details.
9  *
10  *   Copyright (C) 2009-2016 John Crispin <blogic@openwrt.org>
11  *   Copyright (C) 2009-2016 Felix Fietkau <nbd@openwrt.org>
12  *   Copyright (C) 2013-2016 Michael Lee <igvtee@gmail.com>
13  */
14 
15 #include <linux/of_device.h>
16 #include <linux/of_mdio.h>
17 #include <linux/of_net.h>
18 #include <linux/mfd/syscon.h>
19 #include <linux/regmap.h>
20 #include <linux/clk.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/if_vlan.h>
23 #include <linux/reset.h>
24 #include <linux/tcp.h>
25 #include <linux/interrupt.h>
26 
27 #include "mtk_eth_soc.h"
28 
29 static int mtk_msg_level = -1;
30 module_param_named(msg_level, mtk_msg_level, int, 0);
31 MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
32 
33 #define MTK_ETHTOOL_STAT(x) { #x, \
34 			      offsetof(struct mtk_hw_stats, x) / sizeof(u64) }
35 
36 /* strings used by ethtool */
37 static const struct mtk_ethtool_stats {
38 	char str[ETH_GSTRING_LEN];
39 	u32 offset;
40 } mtk_ethtool_stats[] = {
41 	MTK_ETHTOOL_STAT(tx_bytes),
42 	MTK_ETHTOOL_STAT(tx_packets),
43 	MTK_ETHTOOL_STAT(tx_skip),
44 	MTK_ETHTOOL_STAT(tx_collisions),
45 	MTK_ETHTOOL_STAT(rx_bytes),
46 	MTK_ETHTOOL_STAT(rx_packets),
47 	MTK_ETHTOOL_STAT(rx_overflow),
48 	MTK_ETHTOOL_STAT(rx_fcs_errors),
49 	MTK_ETHTOOL_STAT(rx_short_errors),
50 	MTK_ETHTOOL_STAT(rx_long_errors),
51 	MTK_ETHTOOL_STAT(rx_checksum_errors),
52 	MTK_ETHTOOL_STAT(rx_flow_control_packets),
53 };
54 
55 static const char * const mtk_clks_source_name[] = {
56 	"ethif", "esw", "gp1", "gp2", "trgpll"
57 };
58 
59 void mtk_w32(struct mtk_eth *eth, u32 val, unsigned reg)
60 {
61 	__raw_writel(val, eth->base + reg);
62 }
63 
64 u32 mtk_r32(struct mtk_eth *eth, unsigned reg)
65 {
66 	return __raw_readl(eth->base + reg);
67 }
68 
69 static int mtk_mdio_busy_wait(struct mtk_eth *eth)
70 {
71 	unsigned long t_start = jiffies;
72 
73 	while (1) {
74 		if (!(mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_ACCESS))
75 			return 0;
76 		if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
77 			break;
78 		usleep_range(10, 20);
79 	}
80 
81 	dev_err(eth->dev, "mdio: MDIO timeout\n");
82 	return -1;
83 }
84 
85 static u32 _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr,
86 			   u32 phy_register, u32 write_data)
87 {
88 	if (mtk_mdio_busy_wait(eth))
89 		return -1;
90 
91 	write_data &= 0xffff;
92 
93 	mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
94 		(phy_register << PHY_IAC_REG_SHIFT) |
95 		(phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
96 		MTK_PHY_IAC);
97 
98 	if (mtk_mdio_busy_wait(eth))
99 		return -1;
100 
101 	return 0;
102 }
103 
104 static u32 _mtk_mdio_read(struct mtk_eth *eth, int phy_addr, int phy_reg)
105 {
106 	u32 d;
107 
108 	if (mtk_mdio_busy_wait(eth))
109 		return 0xffff;
110 
111 	mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_READ |
112 		(phy_reg << PHY_IAC_REG_SHIFT) |
113 		(phy_addr << PHY_IAC_ADDR_SHIFT),
114 		MTK_PHY_IAC);
115 
116 	if (mtk_mdio_busy_wait(eth))
117 		return 0xffff;
118 
119 	d = mtk_r32(eth, MTK_PHY_IAC) & 0xffff;
120 
121 	return d;
122 }
123 
124 static int mtk_mdio_write(struct mii_bus *bus, int phy_addr,
125 			  int phy_reg, u16 val)
126 {
127 	struct mtk_eth *eth = bus->priv;
128 
129 	return _mtk_mdio_write(eth, phy_addr, phy_reg, val);
130 }
131 
132 static int mtk_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
133 {
134 	struct mtk_eth *eth = bus->priv;
135 
136 	return _mtk_mdio_read(eth, phy_addr, phy_reg);
137 }
138 
139 static void mtk_gmac0_rgmii_adjust(struct mtk_eth *eth, int speed)
140 {
141 	u32 val;
142 	int ret;
143 
144 	val = (speed == SPEED_1000) ?
145 		INTF_MODE_RGMII_1000 : INTF_MODE_RGMII_10_100;
146 	mtk_w32(eth, val, INTF_MODE);
147 
148 	regmap_update_bits(eth->ethsys, ETHSYS_CLKCFG0,
149 			   ETHSYS_TRGMII_CLK_SEL362_5,
150 			   ETHSYS_TRGMII_CLK_SEL362_5);
151 
152 	val = (speed == SPEED_1000) ? 250000000 : 500000000;
153 	ret = clk_set_rate(eth->clks[MTK_CLK_TRGPLL], val);
154 	if (ret)
155 		dev_err(eth->dev, "Failed to set trgmii pll: %d\n", ret);
156 
157 	val = (speed == SPEED_1000) ?
158 		RCK_CTRL_RGMII_1000 : RCK_CTRL_RGMII_10_100;
159 	mtk_w32(eth, val, TRGMII_RCK_CTRL);
160 
161 	val = (speed == SPEED_1000) ?
162 		TCK_CTRL_RGMII_1000 : TCK_CTRL_RGMII_10_100;
163 	mtk_w32(eth, val, TRGMII_TCK_CTRL);
164 }
165 
166 static void mtk_phy_link_adjust(struct net_device *dev)
167 {
168 	struct mtk_mac *mac = netdev_priv(dev);
169 	u16 lcl_adv = 0, rmt_adv = 0;
170 	u8 flowctrl;
171 	u32 mcr = MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG |
172 		  MAC_MCR_FORCE_MODE | MAC_MCR_TX_EN |
173 		  MAC_MCR_RX_EN | MAC_MCR_BACKOFF_EN |
174 		  MAC_MCR_BACKPR_EN;
175 
176 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
177 		return;
178 
179 	switch (dev->phydev->speed) {
180 	case SPEED_1000:
181 		mcr |= MAC_MCR_SPEED_1000;
182 		break;
183 	case SPEED_100:
184 		mcr |= MAC_MCR_SPEED_100;
185 		break;
186 	};
187 
188 	if (mac->id == 0 && !mac->trgmii)
189 		mtk_gmac0_rgmii_adjust(mac->hw, dev->phydev->speed);
190 
191 	if (dev->phydev->link)
192 		mcr |= MAC_MCR_FORCE_LINK;
193 
194 	if (dev->phydev->duplex) {
195 		mcr |= MAC_MCR_FORCE_DPX;
196 
197 		if (dev->phydev->pause)
198 			rmt_adv = LPA_PAUSE_CAP;
199 		if (dev->phydev->asym_pause)
200 			rmt_adv |= LPA_PAUSE_ASYM;
201 
202 		if (dev->phydev->advertising & ADVERTISED_Pause)
203 			lcl_adv |= ADVERTISE_PAUSE_CAP;
204 		if (dev->phydev->advertising & ADVERTISED_Asym_Pause)
205 			lcl_adv |= ADVERTISE_PAUSE_ASYM;
206 
207 		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
208 
209 		if (flowctrl & FLOW_CTRL_TX)
210 			mcr |= MAC_MCR_FORCE_TX_FC;
211 		if (flowctrl & FLOW_CTRL_RX)
212 			mcr |= MAC_MCR_FORCE_RX_FC;
213 
214 		netif_dbg(mac->hw, link, dev, "rx pause %s, tx pause %s\n",
215 			  flowctrl & FLOW_CTRL_RX ? "enabled" : "disabled",
216 			  flowctrl & FLOW_CTRL_TX ? "enabled" : "disabled");
217 	}
218 
219 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
220 
221 	if (dev->phydev->link)
222 		netif_carrier_on(dev);
223 	else
224 		netif_carrier_off(dev);
225 
226 	if (!of_phy_is_fixed_link(mac->of_node))
227 		phy_print_status(dev->phydev);
228 }
229 
230 static int mtk_phy_connect_node(struct mtk_eth *eth, struct mtk_mac *mac,
231 				struct device_node *phy_node)
232 {
233 	struct phy_device *phydev;
234 	int phy_mode;
235 
236 	phy_mode = of_get_phy_mode(phy_node);
237 	if (phy_mode < 0) {
238 		dev_err(eth->dev, "incorrect phy-mode %d\n", phy_mode);
239 		return -EINVAL;
240 	}
241 
242 	phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
243 				mtk_phy_link_adjust, 0, phy_mode);
244 	if (!phydev) {
245 		dev_err(eth->dev, "could not connect to PHY\n");
246 		return -ENODEV;
247 	}
248 
249 	dev_info(eth->dev,
250 		 "connected mac %d to PHY at %s [uid=%08x, driver=%s]\n",
251 		 mac->id, phydev_name(phydev), phydev->phy_id,
252 		 phydev->drv->name);
253 
254 	return 0;
255 }
256 
257 static int mtk_phy_connect(struct net_device *dev)
258 {
259 	struct mtk_mac *mac = netdev_priv(dev);
260 	struct mtk_eth *eth;
261 	struct device_node *np;
262 	u32 val;
263 
264 	eth = mac->hw;
265 	np = of_parse_phandle(mac->of_node, "phy-handle", 0);
266 	if (!np && of_phy_is_fixed_link(mac->of_node))
267 		if (!of_phy_register_fixed_link(mac->of_node))
268 			np = of_node_get(mac->of_node);
269 	if (!np)
270 		return -ENODEV;
271 
272 	switch (of_get_phy_mode(np)) {
273 	case PHY_INTERFACE_MODE_TRGMII:
274 		mac->trgmii = true;
275 	case PHY_INTERFACE_MODE_RGMII_TXID:
276 	case PHY_INTERFACE_MODE_RGMII_RXID:
277 	case PHY_INTERFACE_MODE_RGMII_ID:
278 	case PHY_INTERFACE_MODE_RGMII:
279 		mac->ge_mode = 0;
280 		break;
281 	case PHY_INTERFACE_MODE_MII:
282 		mac->ge_mode = 1;
283 		break;
284 	case PHY_INTERFACE_MODE_REVMII:
285 		mac->ge_mode = 2;
286 		break;
287 	case PHY_INTERFACE_MODE_RMII:
288 		if (!mac->id)
289 			goto err_phy;
290 		mac->ge_mode = 3;
291 		break;
292 	default:
293 		goto err_phy;
294 	}
295 
296 	/* put the gmac into the right mode */
297 	regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
298 	val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, mac->id);
299 	val |= SYSCFG0_GE_MODE(mac->ge_mode, mac->id);
300 	regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
301 
302 	/* couple phydev to net_device */
303 	if (mtk_phy_connect_node(eth, mac, np))
304 		goto err_phy;
305 
306 	dev->phydev->autoneg = AUTONEG_ENABLE;
307 	dev->phydev->speed = 0;
308 	dev->phydev->duplex = 0;
309 
310 	if (of_phy_is_fixed_link(mac->of_node))
311 		dev->phydev->supported |=
312 		SUPPORTED_Pause | SUPPORTED_Asym_Pause;
313 
314 	dev->phydev->supported &= PHY_GBIT_FEATURES | SUPPORTED_Pause |
315 				   SUPPORTED_Asym_Pause;
316 	dev->phydev->advertising = dev->phydev->supported |
317 				    ADVERTISED_Autoneg;
318 	phy_start_aneg(dev->phydev);
319 
320 	of_node_put(np);
321 
322 	return 0;
323 
324 err_phy:
325 	if (of_phy_is_fixed_link(mac->of_node))
326 		of_phy_deregister_fixed_link(mac->of_node);
327 	of_node_put(np);
328 	dev_err(eth->dev, "%s: invalid phy\n", __func__);
329 	return -EINVAL;
330 }
331 
332 static int mtk_mdio_init(struct mtk_eth *eth)
333 {
334 	struct device_node *mii_np;
335 	int ret;
336 
337 	mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
338 	if (!mii_np) {
339 		dev_err(eth->dev, "no %s child node found", "mdio-bus");
340 		return -ENODEV;
341 	}
342 
343 	if (!of_device_is_available(mii_np)) {
344 		ret = -ENODEV;
345 		goto err_put_node;
346 	}
347 
348 	eth->mii_bus = devm_mdiobus_alloc(eth->dev);
349 	if (!eth->mii_bus) {
350 		ret = -ENOMEM;
351 		goto err_put_node;
352 	}
353 
354 	eth->mii_bus->name = "mdio";
355 	eth->mii_bus->read = mtk_mdio_read;
356 	eth->mii_bus->write = mtk_mdio_write;
357 	eth->mii_bus->priv = eth;
358 	eth->mii_bus->parent = eth->dev;
359 
360 	snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
361 	ret = of_mdiobus_register(eth->mii_bus, mii_np);
362 
363 err_put_node:
364 	of_node_put(mii_np);
365 	return ret;
366 }
367 
368 static void mtk_mdio_cleanup(struct mtk_eth *eth)
369 {
370 	if (!eth->mii_bus)
371 		return;
372 
373 	mdiobus_unregister(eth->mii_bus);
374 }
375 
376 static inline void mtk_tx_irq_disable(struct mtk_eth *eth, u32 mask)
377 {
378 	unsigned long flags;
379 	u32 val;
380 
381 	spin_lock_irqsave(&eth->tx_irq_lock, flags);
382 	val = mtk_r32(eth, MTK_QDMA_INT_MASK);
383 	mtk_w32(eth, val & ~mask, MTK_QDMA_INT_MASK);
384 	spin_unlock_irqrestore(&eth->tx_irq_lock, flags);
385 }
386 
387 static inline void mtk_tx_irq_enable(struct mtk_eth *eth, u32 mask)
388 {
389 	unsigned long flags;
390 	u32 val;
391 
392 	spin_lock_irqsave(&eth->tx_irq_lock, flags);
393 	val = mtk_r32(eth, MTK_QDMA_INT_MASK);
394 	mtk_w32(eth, val | mask, MTK_QDMA_INT_MASK);
395 	spin_unlock_irqrestore(&eth->tx_irq_lock, flags);
396 }
397 
398 static inline void mtk_rx_irq_disable(struct mtk_eth *eth, u32 mask)
399 {
400 	unsigned long flags;
401 	u32 val;
402 
403 	spin_lock_irqsave(&eth->rx_irq_lock, flags);
404 	val = mtk_r32(eth, MTK_PDMA_INT_MASK);
405 	mtk_w32(eth, val & ~mask, MTK_PDMA_INT_MASK);
406 	spin_unlock_irqrestore(&eth->rx_irq_lock, flags);
407 }
408 
409 static inline void mtk_rx_irq_enable(struct mtk_eth *eth, u32 mask)
410 {
411 	unsigned long flags;
412 	u32 val;
413 
414 	spin_lock_irqsave(&eth->rx_irq_lock, flags);
415 	val = mtk_r32(eth, MTK_PDMA_INT_MASK);
416 	mtk_w32(eth, val | mask, MTK_PDMA_INT_MASK);
417 	spin_unlock_irqrestore(&eth->rx_irq_lock, flags);
418 }
419 
420 static int mtk_set_mac_address(struct net_device *dev, void *p)
421 {
422 	int ret = eth_mac_addr(dev, p);
423 	struct mtk_mac *mac = netdev_priv(dev);
424 	const char *macaddr = dev->dev_addr;
425 
426 	if (ret)
427 		return ret;
428 
429 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
430 		return -EBUSY;
431 
432 	spin_lock_bh(&mac->hw->page_lock);
433 	mtk_w32(mac->hw, (macaddr[0] << 8) | macaddr[1],
434 		MTK_GDMA_MAC_ADRH(mac->id));
435 	mtk_w32(mac->hw, (macaddr[2] << 24) | (macaddr[3] << 16) |
436 		(macaddr[4] << 8) | macaddr[5],
437 		MTK_GDMA_MAC_ADRL(mac->id));
438 	spin_unlock_bh(&mac->hw->page_lock);
439 
440 	return 0;
441 }
442 
443 void mtk_stats_update_mac(struct mtk_mac *mac)
444 {
445 	struct mtk_hw_stats *hw_stats = mac->hw_stats;
446 	unsigned int base = MTK_GDM1_TX_GBCNT;
447 	u64 stats;
448 
449 	base += hw_stats->reg_offset;
450 
451 	u64_stats_update_begin(&hw_stats->syncp);
452 
453 	hw_stats->rx_bytes += mtk_r32(mac->hw, base);
454 	stats =  mtk_r32(mac->hw, base + 0x04);
455 	if (stats)
456 		hw_stats->rx_bytes += (stats << 32);
457 	hw_stats->rx_packets += mtk_r32(mac->hw, base + 0x08);
458 	hw_stats->rx_overflow += mtk_r32(mac->hw, base + 0x10);
459 	hw_stats->rx_fcs_errors += mtk_r32(mac->hw, base + 0x14);
460 	hw_stats->rx_short_errors += mtk_r32(mac->hw, base + 0x18);
461 	hw_stats->rx_long_errors += mtk_r32(mac->hw, base + 0x1c);
462 	hw_stats->rx_checksum_errors += mtk_r32(mac->hw, base + 0x20);
463 	hw_stats->rx_flow_control_packets +=
464 					mtk_r32(mac->hw, base + 0x24);
465 	hw_stats->tx_skip += mtk_r32(mac->hw, base + 0x28);
466 	hw_stats->tx_collisions += mtk_r32(mac->hw, base + 0x2c);
467 	hw_stats->tx_bytes += mtk_r32(mac->hw, base + 0x30);
468 	stats =  mtk_r32(mac->hw, base + 0x34);
469 	if (stats)
470 		hw_stats->tx_bytes += (stats << 32);
471 	hw_stats->tx_packets += mtk_r32(mac->hw, base + 0x38);
472 	u64_stats_update_end(&hw_stats->syncp);
473 }
474 
475 static void mtk_stats_update(struct mtk_eth *eth)
476 {
477 	int i;
478 
479 	for (i = 0; i < MTK_MAC_COUNT; i++) {
480 		if (!eth->mac[i] || !eth->mac[i]->hw_stats)
481 			continue;
482 		if (spin_trylock(&eth->mac[i]->hw_stats->stats_lock)) {
483 			mtk_stats_update_mac(eth->mac[i]);
484 			spin_unlock(&eth->mac[i]->hw_stats->stats_lock);
485 		}
486 	}
487 }
488 
489 static void mtk_get_stats64(struct net_device *dev,
490 			    struct rtnl_link_stats64 *storage)
491 {
492 	struct mtk_mac *mac = netdev_priv(dev);
493 	struct mtk_hw_stats *hw_stats = mac->hw_stats;
494 	unsigned int start;
495 
496 	if (netif_running(dev) && netif_device_present(dev)) {
497 		if (spin_trylock_bh(&hw_stats->stats_lock)) {
498 			mtk_stats_update_mac(mac);
499 			spin_unlock_bh(&hw_stats->stats_lock);
500 		}
501 	}
502 
503 	do {
504 		start = u64_stats_fetch_begin_irq(&hw_stats->syncp);
505 		storage->rx_packets = hw_stats->rx_packets;
506 		storage->tx_packets = hw_stats->tx_packets;
507 		storage->rx_bytes = hw_stats->rx_bytes;
508 		storage->tx_bytes = hw_stats->tx_bytes;
509 		storage->collisions = hw_stats->tx_collisions;
510 		storage->rx_length_errors = hw_stats->rx_short_errors +
511 			hw_stats->rx_long_errors;
512 		storage->rx_over_errors = hw_stats->rx_overflow;
513 		storage->rx_crc_errors = hw_stats->rx_fcs_errors;
514 		storage->rx_errors = hw_stats->rx_checksum_errors;
515 		storage->tx_aborted_errors = hw_stats->tx_skip;
516 	} while (u64_stats_fetch_retry_irq(&hw_stats->syncp, start));
517 
518 	storage->tx_errors = dev->stats.tx_errors;
519 	storage->rx_dropped = dev->stats.rx_dropped;
520 	storage->tx_dropped = dev->stats.tx_dropped;
521 }
522 
523 static inline int mtk_max_frag_size(int mtu)
524 {
525 	/* make sure buf_size will be at least MTK_MAX_RX_LENGTH */
526 	if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH)
527 		mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
528 
529 	return SKB_DATA_ALIGN(MTK_RX_HLEN + mtu) +
530 		SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
531 }
532 
533 static inline int mtk_max_buf_size(int frag_size)
534 {
535 	int buf_size = frag_size - NET_SKB_PAD - NET_IP_ALIGN -
536 		       SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
537 
538 	WARN_ON(buf_size < MTK_MAX_RX_LENGTH);
539 
540 	return buf_size;
541 }
542 
543 static inline void mtk_rx_get_desc(struct mtk_rx_dma *rxd,
544 				   struct mtk_rx_dma *dma_rxd)
545 {
546 	rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
547 	rxd->rxd2 = READ_ONCE(dma_rxd->rxd2);
548 	rxd->rxd3 = READ_ONCE(dma_rxd->rxd3);
549 	rxd->rxd4 = READ_ONCE(dma_rxd->rxd4);
550 }
551 
552 /* the qdma core needs scratch memory to be setup */
553 static int mtk_init_fq_dma(struct mtk_eth *eth)
554 {
555 	dma_addr_t phy_ring_tail;
556 	int cnt = MTK_DMA_SIZE;
557 	dma_addr_t dma_addr;
558 	int i;
559 
560 	eth->scratch_ring = dma_alloc_coherent(eth->dev,
561 					       cnt * sizeof(struct mtk_tx_dma),
562 					       &eth->phy_scratch_ring,
563 					       GFP_ATOMIC | __GFP_ZERO);
564 	if (unlikely(!eth->scratch_ring))
565 		return -ENOMEM;
566 
567 	eth->scratch_head = kcalloc(cnt, MTK_QDMA_PAGE_SIZE,
568 				    GFP_KERNEL);
569 	if (unlikely(!eth->scratch_head))
570 		return -ENOMEM;
571 
572 	dma_addr = dma_map_single(eth->dev,
573 				  eth->scratch_head, cnt * MTK_QDMA_PAGE_SIZE,
574 				  DMA_FROM_DEVICE);
575 	if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
576 		return -ENOMEM;
577 
578 	memset(eth->scratch_ring, 0x0, sizeof(struct mtk_tx_dma) * cnt);
579 	phy_ring_tail = eth->phy_scratch_ring +
580 			(sizeof(struct mtk_tx_dma) * (cnt - 1));
581 
582 	for (i = 0; i < cnt; i++) {
583 		eth->scratch_ring[i].txd1 =
584 					(dma_addr + (i * MTK_QDMA_PAGE_SIZE));
585 		if (i < cnt - 1)
586 			eth->scratch_ring[i].txd2 = (eth->phy_scratch_ring +
587 				((i + 1) * sizeof(struct mtk_tx_dma)));
588 		eth->scratch_ring[i].txd3 = TX_DMA_SDL(MTK_QDMA_PAGE_SIZE);
589 	}
590 
591 	mtk_w32(eth, eth->phy_scratch_ring, MTK_QDMA_FQ_HEAD);
592 	mtk_w32(eth, phy_ring_tail, MTK_QDMA_FQ_TAIL);
593 	mtk_w32(eth, (cnt << 16) | cnt, MTK_QDMA_FQ_CNT);
594 	mtk_w32(eth, MTK_QDMA_PAGE_SIZE << 16, MTK_QDMA_FQ_BLEN);
595 
596 	return 0;
597 }
598 
599 static inline void *mtk_qdma_phys_to_virt(struct mtk_tx_ring *ring, u32 desc)
600 {
601 	void *ret = ring->dma;
602 
603 	return ret + (desc - ring->phys);
604 }
605 
606 static inline struct mtk_tx_buf *mtk_desc_to_tx_buf(struct mtk_tx_ring *ring,
607 						    struct mtk_tx_dma *txd)
608 {
609 	int idx = txd - ring->dma;
610 
611 	return &ring->buf[idx];
612 }
613 
614 static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
615 {
616 	if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
617 		dma_unmap_single(eth->dev,
618 				 dma_unmap_addr(tx_buf, dma_addr0),
619 				 dma_unmap_len(tx_buf, dma_len0),
620 				 DMA_TO_DEVICE);
621 	} else if (tx_buf->flags & MTK_TX_FLAGS_PAGE0) {
622 		dma_unmap_page(eth->dev,
623 			       dma_unmap_addr(tx_buf, dma_addr0),
624 			       dma_unmap_len(tx_buf, dma_len0),
625 			       DMA_TO_DEVICE);
626 	}
627 	tx_buf->flags = 0;
628 	if (tx_buf->skb &&
629 	    (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
630 		dev_kfree_skb_any(tx_buf->skb);
631 	tx_buf->skb = NULL;
632 }
633 
634 static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
635 		      int tx_num, struct mtk_tx_ring *ring, bool gso)
636 {
637 	struct mtk_mac *mac = netdev_priv(dev);
638 	struct mtk_eth *eth = mac->hw;
639 	struct mtk_tx_dma *itxd, *txd;
640 	struct mtk_tx_buf *itx_buf, *tx_buf;
641 	dma_addr_t mapped_addr;
642 	unsigned int nr_frags;
643 	int i, n_desc = 1;
644 	u32 txd4 = 0, fport;
645 
646 	itxd = ring->next_free;
647 	if (itxd == ring->last_free)
648 		return -ENOMEM;
649 
650 	/* set the forward port */
651 	fport = (mac->id + 1) << TX_DMA_FPORT_SHIFT;
652 	txd4 |= fport;
653 
654 	itx_buf = mtk_desc_to_tx_buf(ring, itxd);
655 	memset(itx_buf, 0, sizeof(*itx_buf));
656 
657 	if (gso)
658 		txd4 |= TX_DMA_TSO;
659 
660 	/* TX Checksum offload */
661 	if (skb->ip_summed == CHECKSUM_PARTIAL)
662 		txd4 |= TX_DMA_CHKSUM;
663 
664 	/* VLAN header offload */
665 	if (skb_vlan_tag_present(skb))
666 		txd4 |= TX_DMA_INS_VLAN | skb_vlan_tag_get(skb);
667 
668 	mapped_addr = dma_map_single(eth->dev, skb->data,
669 				     skb_headlen(skb), DMA_TO_DEVICE);
670 	if (unlikely(dma_mapping_error(eth->dev, mapped_addr)))
671 		return -ENOMEM;
672 
673 	WRITE_ONCE(itxd->txd1, mapped_addr);
674 	itx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
675 	itx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
676 			  MTK_TX_FLAGS_FPORT1;
677 	dma_unmap_addr_set(itx_buf, dma_addr0, mapped_addr);
678 	dma_unmap_len_set(itx_buf, dma_len0, skb_headlen(skb));
679 
680 	/* TX SG offload */
681 	txd = itxd;
682 	nr_frags = skb_shinfo(skb)->nr_frags;
683 	for (i = 0; i < nr_frags; i++) {
684 		struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
685 		unsigned int offset = 0;
686 		int frag_size = skb_frag_size(frag);
687 
688 		while (frag_size) {
689 			bool last_frag = false;
690 			unsigned int frag_map_size;
691 
692 			txd = mtk_qdma_phys_to_virt(ring, txd->txd2);
693 			if (txd == ring->last_free)
694 				goto err_dma;
695 
696 			n_desc++;
697 			frag_map_size = min(frag_size, MTK_TX_DMA_BUF_LEN);
698 			mapped_addr = skb_frag_dma_map(eth->dev, frag, offset,
699 						       frag_map_size,
700 						       DMA_TO_DEVICE);
701 			if (unlikely(dma_mapping_error(eth->dev, mapped_addr)))
702 				goto err_dma;
703 
704 			if (i == nr_frags - 1 &&
705 			    (frag_size - frag_map_size) == 0)
706 				last_frag = true;
707 
708 			WRITE_ONCE(txd->txd1, mapped_addr);
709 			WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
710 					       TX_DMA_PLEN0(frag_map_size) |
711 					       last_frag * TX_DMA_LS0));
712 			WRITE_ONCE(txd->txd4, fport);
713 
714 			tx_buf = mtk_desc_to_tx_buf(ring, txd);
715 			memset(tx_buf, 0, sizeof(*tx_buf));
716 			tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
717 			tx_buf->flags |= MTK_TX_FLAGS_PAGE0;
718 			tx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
719 					 MTK_TX_FLAGS_FPORT1;
720 
721 			dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
722 			dma_unmap_len_set(tx_buf, dma_len0, frag_map_size);
723 			frag_size -= frag_map_size;
724 			offset += frag_map_size;
725 		}
726 	}
727 
728 	/* store skb to cleanup */
729 	itx_buf->skb = skb;
730 
731 	WRITE_ONCE(itxd->txd4, txd4);
732 	WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
733 				(!nr_frags * TX_DMA_LS0)));
734 
735 	netdev_sent_queue(dev, skb->len);
736 	skb_tx_timestamp(skb);
737 
738 	ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
739 	atomic_sub(n_desc, &ring->free_count);
740 
741 	/* make sure that all changes to the dma ring are flushed before we
742 	 * continue
743 	 */
744 	wmb();
745 
746 	if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)) || !skb->xmit_more)
747 		mtk_w32(eth, txd->txd2, MTK_QTX_CTX_PTR);
748 
749 	return 0;
750 
751 err_dma:
752 	do {
753 		tx_buf = mtk_desc_to_tx_buf(ring, itxd);
754 
755 		/* unmap dma */
756 		mtk_tx_unmap(eth, tx_buf);
757 
758 		itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
759 		itxd = mtk_qdma_phys_to_virt(ring, itxd->txd2);
760 	} while (itxd != txd);
761 
762 	return -ENOMEM;
763 }
764 
765 static inline int mtk_cal_txd_req(struct sk_buff *skb)
766 {
767 	int i, nfrags;
768 	struct skb_frag_struct *frag;
769 
770 	nfrags = 1;
771 	if (skb_is_gso(skb)) {
772 		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
773 			frag = &skb_shinfo(skb)->frags[i];
774 			nfrags += DIV_ROUND_UP(frag->size, MTK_TX_DMA_BUF_LEN);
775 		}
776 	} else {
777 		nfrags += skb_shinfo(skb)->nr_frags;
778 	}
779 
780 	return nfrags;
781 }
782 
783 static int mtk_queue_stopped(struct mtk_eth *eth)
784 {
785 	int i;
786 
787 	for (i = 0; i < MTK_MAC_COUNT; i++) {
788 		if (!eth->netdev[i])
789 			continue;
790 		if (netif_queue_stopped(eth->netdev[i]))
791 			return 1;
792 	}
793 
794 	return 0;
795 }
796 
797 static void mtk_wake_queue(struct mtk_eth *eth)
798 {
799 	int i;
800 
801 	for (i = 0; i < MTK_MAC_COUNT; i++) {
802 		if (!eth->netdev[i])
803 			continue;
804 		netif_wake_queue(eth->netdev[i]);
805 	}
806 }
807 
808 static void mtk_stop_queue(struct mtk_eth *eth)
809 {
810 	int i;
811 
812 	for (i = 0; i < MTK_MAC_COUNT; i++) {
813 		if (!eth->netdev[i])
814 			continue;
815 		netif_stop_queue(eth->netdev[i]);
816 	}
817 }
818 
819 static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
820 {
821 	struct mtk_mac *mac = netdev_priv(dev);
822 	struct mtk_eth *eth = mac->hw;
823 	struct mtk_tx_ring *ring = &eth->tx_ring;
824 	struct net_device_stats *stats = &dev->stats;
825 	bool gso = false;
826 	int tx_num;
827 
828 	/* normally we can rely on the stack not calling this more than once,
829 	 * however we have 2 queues running on the same ring so we need to lock
830 	 * the ring access
831 	 */
832 	spin_lock(&eth->page_lock);
833 
834 	if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
835 		goto drop;
836 
837 	tx_num = mtk_cal_txd_req(skb);
838 	if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
839 		mtk_stop_queue(eth);
840 		netif_err(eth, tx_queued, dev,
841 			  "Tx Ring full when queue awake!\n");
842 		spin_unlock(&eth->page_lock);
843 		return NETDEV_TX_BUSY;
844 	}
845 
846 	/* TSO: fill MSS info in tcp checksum field */
847 	if (skb_is_gso(skb)) {
848 		if (skb_cow_head(skb, 0)) {
849 			netif_warn(eth, tx_err, dev,
850 				   "GSO expand head fail.\n");
851 			goto drop;
852 		}
853 
854 		if (skb_shinfo(skb)->gso_type &
855 				(SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
856 			gso = true;
857 			tcp_hdr(skb)->check = htons(skb_shinfo(skb)->gso_size);
858 		}
859 	}
860 
861 	if (mtk_tx_map(skb, dev, tx_num, ring, gso) < 0)
862 		goto drop;
863 
864 	if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
865 		mtk_stop_queue(eth);
866 
867 	spin_unlock(&eth->page_lock);
868 
869 	return NETDEV_TX_OK;
870 
871 drop:
872 	spin_unlock(&eth->page_lock);
873 	stats->tx_dropped++;
874 	dev_kfree_skb_any(skb);
875 	return NETDEV_TX_OK;
876 }
877 
878 static struct mtk_rx_ring *mtk_get_rx_ring(struct mtk_eth *eth)
879 {
880 	int i;
881 	struct mtk_rx_ring *ring;
882 	int idx;
883 
884 	if (!eth->hwlro)
885 		return &eth->rx_ring[0];
886 
887 	for (i = 0; i < MTK_MAX_RX_RING_NUM; i++) {
888 		ring = &eth->rx_ring[i];
889 		idx = NEXT_RX_DESP_IDX(ring->calc_idx, ring->dma_size);
890 		if (ring->dma[idx].rxd2 & RX_DMA_DONE) {
891 			ring->calc_idx_update = true;
892 			return ring;
893 		}
894 	}
895 
896 	return NULL;
897 }
898 
899 static void mtk_update_rx_cpu_idx(struct mtk_eth *eth)
900 {
901 	struct mtk_rx_ring *ring;
902 	int i;
903 
904 	if (!eth->hwlro) {
905 		ring = &eth->rx_ring[0];
906 		mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
907 	} else {
908 		for (i = 0; i < MTK_MAX_RX_RING_NUM; i++) {
909 			ring = &eth->rx_ring[i];
910 			if (ring->calc_idx_update) {
911 				ring->calc_idx_update = false;
912 				mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
913 			}
914 		}
915 	}
916 }
917 
918 static int mtk_poll_rx(struct napi_struct *napi, int budget,
919 		       struct mtk_eth *eth)
920 {
921 	struct mtk_rx_ring *ring;
922 	int idx;
923 	struct sk_buff *skb;
924 	u8 *data, *new_data;
925 	struct mtk_rx_dma *rxd, trxd;
926 	int done = 0;
927 
928 	while (done < budget) {
929 		struct net_device *netdev;
930 		unsigned int pktlen;
931 		dma_addr_t dma_addr;
932 		int mac = 0;
933 
934 		ring = mtk_get_rx_ring(eth);
935 		if (unlikely(!ring))
936 			goto rx_done;
937 
938 		idx = NEXT_RX_DESP_IDX(ring->calc_idx, ring->dma_size);
939 		rxd = &ring->dma[idx];
940 		data = ring->data[idx];
941 
942 		mtk_rx_get_desc(&trxd, rxd);
943 		if (!(trxd.rxd2 & RX_DMA_DONE))
944 			break;
945 
946 		/* find out which mac the packet come from. values start at 1 */
947 		mac = (trxd.rxd4 >> RX_DMA_FPORT_SHIFT) &
948 		      RX_DMA_FPORT_MASK;
949 		mac--;
950 
951 		if (unlikely(mac < 0 || mac >= MTK_MAC_COUNT ||
952 			     !eth->netdev[mac]))
953 			goto release_desc;
954 
955 		netdev = eth->netdev[mac];
956 
957 		if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
958 			goto release_desc;
959 
960 		/* alloc new buffer */
961 		new_data = napi_alloc_frag(ring->frag_size);
962 		if (unlikely(!new_data)) {
963 			netdev->stats.rx_dropped++;
964 			goto release_desc;
965 		}
966 		dma_addr = dma_map_single(eth->dev,
967 					  new_data + NET_SKB_PAD,
968 					  ring->buf_size,
969 					  DMA_FROM_DEVICE);
970 		if (unlikely(dma_mapping_error(eth->dev, dma_addr))) {
971 			skb_free_frag(new_data);
972 			netdev->stats.rx_dropped++;
973 			goto release_desc;
974 		}
975 
976 		/* receive data */
977 		skb = build_skb(data, ring->frag_size);
978 		if (unlikely(!skb)) {
979 			skb_free_frag(new_data);
980 			netdev->stats.rx_dropped++;
981 			goto release_desc;
982 		}
983 		skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
984 
985 		dma_unmap_single(eth->dev, trxd.rxd1,
986 				 ring->buf_size, DMA_FROM_DEVICE);
987 		pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
988 		skb->dev = netdev;
989 		skb_put(skb, pktlen);
990 		if (trxd.rxd4 & RX_DMA_L4_VALID)
991 			skb->ip_summed = CHECKSUM_UNNECESSARY;
992 		else
993 			skb_checksum_none_assert(skb);
994 		skb->protocol = eth_type_trans(skb, netdev);
995 
996 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
997 		    RX_DMA_VID(trxd.rxd3))
998 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
999 					       RX_DMA_VID(trxd.rxd3));
1000 		skb_record_rx_queue(skb, 0);
1001 		napi_gro_receive(napi, skb);
1002 
1003 		ring->data[idx] = new_data;
1004 		rxd->rxd1 = (unsigned int)dma_addr;
1005 
1006 release_desc:
1007 		rxd->rxd2 = RX_DMA_PLEN0(ring->buf_size);
1008 
1009 		ring->calc_idx = idx;
1010 
1011 		done++;
1012 	}
1013 
1014 rx_done:
1015 	if (done) {
1016 		/* make sure that all changes to the dma ring are flushed before
1017 		 * we continue
1018 		 */
1019 		wmb();
1020 		mtk_update_rx_cpu_idx(eth);
1021 	}
1022 
1023 	return done;
1024 }
1025 
1026 static int mtk_poll_tx(struct mtk_eth *eth, int budget)
1027 {
1028 	struct mtk_tx_ring *ring = &eth->tx_ring;
1029 	struct mtk_tx_dma *desc;
1030 	struct sk_buff *skb;
1031 	struct mtk_tx_buf *tx_buf;
1032 	unsigned int done[MTK_MAX_DEVS];
1033 	unsigned int bytes[MTK_MAX_DEVS];
1034 	u32 cpu, dma;
1035 	static int condition;
1036 	int total = 0, i;
1037 
1038 	memset(done, 0, sizeof(done));
1039 	memset(bytes, 0, sizeof(bytes));
1040 
1041 	cpu = mtk_r32(eth, MTK_QTX_CRX_PTR);
1042 	dma = mtk_r32(eth, MTK_QTX_DRX_PTR);
1043 
1044 	desc = mtk_qdma_phys_to_virt(ring, cpu);
1045 
1046 	while ((cpu != dma) && budget) {
1047 		u32 next_cpu = desc->txd2;
1048 		int mac = 0;
1049 
1050 		desc = mtk_qdma_phys_to_virt(ring, desc->txd2);
1051 		if ((desc->txd3 & TX_DMA_OWNER_CPU) == 0)
1052 			break;
1053 
1054 		tx_buf = mtk_desc_to_tx_buf(ring, desc);
1055 		if (tx_buf->flags & MTK_TX_FLAGS_FPORT1)
1056 			mac = 1;
1057 
1058 		skb = tx_buf->skb;
1059 		if (!skb) {
1060 			condition = 1;
1061 			break;
1062 		}
1063 
1064 		if (skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC) {
1065 			bytes[mac] += skb->len;
1066 			done[mac]++;
1067 			budget--;
1068 		}
1069 		mtk_tx_unmap(eth, tx_buf);
1070 
1071 		ring->last_free = desc;
1072 		atomic_inc(&ring->free_count);
1073 
1074 		cpu = next_cpu;
1075 	}
1076 
1077 	mtk_w32(eth, cpu, MTK_QTX_CRX_PTR);
1078 
1079 	for (i = 0; i < MTK_MAC_COUNT; i++) {
1080 		if (!eth->netdev[i] || !done[i])
1081 			continue;
1082 		netdev_completed_queue(eth->netdev[i], done[i], bytes[i]);
1083 		total += done[i];
1084 	}
1085 
1086 	if (mtk_queue_stopped(eth) &&
1087 	    (atomic_read(&ring->free_count) > ring->thresh))
1088 		mtk_wake_queue(eth);
1089 
1090 	return total;
1091 }
1092 
1093 static void mtk_handle_status_irq(struct mtk_eth *eth)
1094 {
1095 	u32 status2 = mtk_r32(eth, MTK_INT_STATUS2);
1096 
1097 	if (unlikely(status2 & (MTK_GDM1_AF | MTK_GDM2_AF))) {
1098 		mtk_stats_update(eth);
1099 		mtk_w32(eth, (MTK_GDM1_AF | MTK_GDM2_AF),
1100 			MTK_INT_STATUS2);
1101 	}
1102 }
1103 
1104 static int mtk_napi_tx(struct napi_struct *napi, int budget)
1105 {
1106 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, tx_napi);
1107 	u32 status, mask;
1108 	int tx_done = 0;
1109 
1110 	mtk_handle_status_irq(eth);
1111 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_QMTK_INT_STATUS);
1112 	tx_done = mtk_poll_tx(eth, budget);
1113 
1114 	if (unlikely(netif_msg_intr(eth))) {
1115 		status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
1116 		mask = mtk_r32(eth, MTK_QDMA_INT_MASK);
1117 		dev_info(eth->dev,
1118 			 "done tx %d, intr 0x%08x/0x%x\n",
1119 			 tx_done, status, mask);
1120 	}
1121 
1122 	if (tx_done == budget)
1123 		return budget;
1124 
1125 	status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
1126 	if (status & MTK_TX_DONE_INT)
1127 		return budget;
1128 
1129 	napi_complete(napi);
1130 	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1131 
1132 	return tx_done;
1133 }
1134 
1135 static int mtk_napi_rx(struct napi_struct *napi, int budget)
1136 {
1137 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, rx_napi);
1138 	u32 status, mask;
1139 	int rx_done = 0;
1140 	int remain_budget = budget;
1141 
1142 	mtk_handle_status_irq(eth);
1143 
1144 poll_again:
1145 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
1146 	rx_done = mtk_poll_rx(napi, remain_budget, eth);
1147 
1148 	if (unlikely(netif_msg_intr(eth))) {
1149 		status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
1150 		mask = mtk_r32(eth, MTK_PDMA_INT_MASK);
1151 		dev_info(eth->dev,
1152 			 "done rx %d, intr 0x%08x/0x%x\n",
1153 			 rx_done, status, mask);
1154 	}
1155 	if (rx_done == remain_budget)
1156 		return budget;
1157 
1158 	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
1159 	if (status & MTK_RX_DONE_INT) {
1160 		remain_budget -= rx_done;
1161 		goto poll_again;
1162 	}
1163 	napi_complete(napi);
1164 	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1165 
1166 	return rx_done + budget - remain_budget;
1167 }
1168 
1169 static int mtk_tx_alloc(struct mtk_eth *eth)
1170 {
1171 	struct mtk_tx_ring *ring = &eth->tx_ring;
1172 	int i, sz = sizeof(*ring->dma);
1173 
1174 	ring->buf = kcalloc(MTK_DMA_SIZE, sizeof(*ring->buf),
1175 			       GFP_KERNEL);
1176 	if (!ring->buf)
1177 		goto no_tx_mem;
1178 
1179 	ring->dma = dma_alloc_coherent(eth->dev,
1180 					  MTK_DMA_SIZE * sz,
1181 					  &ring->phys,
1182 					  GFP_ATOMIC | __GFP_ZERO);
1183 	if (!ring->dma)
1184 		goto no_tx_mem;
1185 
1186 	memset(ring->dma, 0, MTK_DMA_SIZE * sz);
1187 	for (i = 0; i < MTK_DMA_SIZE; i++) {
1188 		int next = (i + 1) % MTK_DMA_SIZE;
1189 		u32 next_ptr = ring->phys + next * sz;
1190 
1191 		ring->dma[i].txd2 = next_ptr;
1192 		ring->dma[i].txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
1193 	}
1194 
1195 	atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
1196 	ring->next_free = &ring->dma[0];
1197 	ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
1198 	ring->thresh = MAX_SKB_FRAGS;
1199 
1200 	/* make sure that all changes to the dma ring are flushed before we
1201 	 * continue
1202 	 */
1203 	wmb();
1204 
1205 	mtk_w32(eth, ring->phys, MTK_QTX_CTX_PTR);
1206 	mtk_w32(eth, ring->phys, MTK_QTX_DTX_PTR);
1207 	mtk_w32(eth,
1208 		ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1209 		MTK_QTX_CRX_PTR);
1210 	mtk_w32(eth,
1211 		ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1212 		MTK_QTX_DRX_PTR);
1213 	mtk_w32(eth, (QDMA_RES_THRES << 8) | QDMA_RES_THRES, MTK_QTX_CFG(0));
1214 
1215 	return 0;
1216 
1217 no_tx_mem:
1218 	return -ENOMEM;
1219 }
1220 
1221 static void mtk_tx_clean(struct mtk_eth *eth)
1222 {
1223 	struct mtk_tx_ring *ring = &eth->tx_ring;
1224 	int i;
1225 
1226 	if (ring->buf) {
1227 		for (i = 0; i < MTK_DMA_SIZE; i++)
1228 			mtk_tx_unmap(eth, &ring->buf[i]);
1229 		kfree(ring->buf);
1230 		ring->buf = NULL;
1231 	}
1232 
1233 	if (ring->dma) {
1234 		dma_free_coherent(eth->dev,
1235 				  MTK_DMA_SIZE * sizeof(*ring->dma),
1236 				  ring->dma,
1237 				  ring->phys);
1238 		ring->dma = NULL;
1239 	}
1240 }
1241 
1242 static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
1243 {
1244 	struct mtk_rx_ring *ring = &eth->rx_ring[ring_no];
1245 	int rx_data_len, rx_dma_size;
1246 	int i;
1247 
1248 	if (rx_flag == MTK_RX_FLAGS_HWLRO) {
1249 		rx_data_len = MTK_MAX_LRO_RX_LENGTH;
1250 		rx_dma_size = MTK_HW_LRO_DMA_SIZE;
1251 	} else {
1252 		rx_data_len = ETH_DATA_LEN;
1253 		rx_dma_size = MTK_DMA_SIZE;
1254 	}
1255 
1256 	ring->frag_size = mtk_max_frag_size(rx_data_len);
1257 	ring->buf_size = mtk_max_buf_size(ring->frag_size);
1258 	ring->data = kcalloc(rx_dma_size, sizeof(*ring->data),
1259 			     GFP_KERNEL);
1260 	if (!ring->data)
1261 		return -ENOMEM;
1262 
1263 	for (i = 0; i < rx_dma_size; i++) {
1264 		ring->data[i] = netdev_alloc_frag(ring->frag_size);
1265 		if (!ring->data[i])
1266 			return -ENOMEM;
1267 	}
1268 
1269 	ring->dma = dma_alloc_coherent(eth->dev,
1270 				       rx_dma_size * sizeof(*ring->dma),
1271 				       &ring->phys,
1272 				       GFP_ATOMIC | __GFP_ZERO);
1273 	if (!ring->dma)
1274 		return -ENOMEM;
1275 
1276 	for (i = 0; i < rx_dma_size; i++) {
1277 		dma_addr_t dma_addr = dma_map_single(eth->dev,
1278 				ring->data[i] + NET_SKB_PAD,
1279 				ring->buf_size,
1280 				DMA_FROM_DEVICE);
1281 		if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
1282 			return -ENOMEM;
1283 		ring->dma[i].rxd1 = (unsigned int)dma_addr;
1284 
1285 		ring->dma[i].rxd2 = RX_DMA_PLEN0(ring->buf_size);
1286 	}
1287 	ring->dma_size = rx_dma_size;
1288 	ring->calc_idx_update = false;
1289 	ring->calc_idx = rx_dma_size - 1;
1290 	ring->crx_idx_reg = MTK_PRX_CRX_IDX_CFG(ring_no);
1291 	/* make sure that all changes to the dma ring are flushed before we
1292 	 * continue
1293 	 */
1294 	wmb();
1295 
1296 	mtk_w32(eth, ring->phys, MTK_PRX_BASE_PTR_CFG(ring_no));
1297 	mtk_w32(eth, rx_dma_size, MTK_PRX_MAX_CNT_CFG(ring_no));
1298 	mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
1299 	mtk_w32(eth, MTK_PST_DRX_IDX_CFG(ring_no), MTK_PDMA_RST_IDX);
1300 
1301 	return 0;
1302 }
1303 
1304 static void mtk_rx_clean(struct mtk_eth *eth, int ring_no)
1305 {
1306 	struct mtk_rx_ring *ring = &eth->rx_ring[ring_no];
1307 	int i;
1308 
1309 	if (ring->data && ring->dma) {
1310 		for (i = 0; i < ring->dma_size; i++) {
1311 			if (!ring->data[i])
1312 				continue;
1313 			if (!ring->dma[i].rxd1)
1314 				continue;
1315 			dma_unmap_single(eth->dev,
1316 					 ring->dma[i].rxd1,
1317 					 ring->buf_size,
1318 					 DMA_FROM_DEVICE);
1319 			skb_free_frag(ring->data[i]);
1320 		}
1321 		kfree(ring->data);
1322 		ring->data = NULL;
1323 	}
1324 
1325 	if (ring->dma) {
1326 		dma_free_coherent(eth->dev,
1327 				  ring->dma_size * sizeof(*ring->dma),
1328 				  ring->dma,
1329 				  ring->phys);
1330 		ring->dma = NULL;
1331 	}
1332 }
1333 
1334 static int mtk_hwlro_rx_init(struct mtk_eth *eth)
1335 {
1336 	int i;
1337 	u32 ring_ctrl_dw1 = 0, ring_ctrl_dw2 = 0, ring_ctrl_dw3 = 0;
1338 	u32 lro_ctrl_dw0 = 0, lro_ctrl_dw3 = 0;
1339 
1340 	/* set LRO rings to auto-learn modes */
1341 	ring_ctrl_dw2 |= MTK_RING_AUTO_LERAN_MODE;
1342 
1343 	/* validate LRO ring */
1344 	ring_ctrl_dw2 |= MTK_RING_VLD;
1345 
1346 	/* set AGE timer (unit: 20us) */
1347 	ring_ctrl_dw2 |= MTK_RING_AGE_TIME_H;
1348 	ring_ctrl_dw1 |= MTK_RING_AGE_TIME_L;
1349 
1350 	/* set max AGG timer (unit: 20us) */
1351 	ring_ctrl_dw2 |= MTK_RING_MAX_AGG_TIME;
1352 
1353 	/* set max LRO AGG count */
1354 	ring_ctrl_dw2 |= MTK_RING_MAX_AGG_CNT_L;
1355 	ring_ctrl_dw3 |= MTK_RING_MAX_AGG_CNT_H;
1356 
1357 	for (i = 1; i < MTK_MAX_RX_RING_NUM; i++) {
1358 		mtk_w32(eth, ring_ctrl_dw1, MTK_LRO_CTRL_DW1_CFG(i));
1359 		mtk_w32(eth, ring_ctrl_dw2, MTK_LRO_CTRL_DW2_CFG(i));
1360 		mtk_w32(eth, ring_ctrl_dw3, MTK_LRO_CTRL_DW3_CFG(i));
1361 	}
1362 
1363 	/* IPv4 checksum update enable */
1364 	lro_ctrl_dw0 |= MTK_L3_CKS_UPD_EN;
1365 
1366 	/* switch priority comparison to packet count mode */
1367 	lro_ctrl_dw0 |= MTK_LRO_ALT_PKT_CNT_MODE;
1368 
1369 	/* bandwidth threshold setting */
1370 	mtk_w32(eth, MTK_HW_LRO_BW_THRE, MTK_PDMA_LRO_CTRL_DW2);
1371 
1372 	/* auto-learn score delta setting */
1373 	mtk_w32(eth, MTK_HW_LRO_REPLACE_DELTA, MTK_PDMA_LRO_ALT_SCORE_DELTA);
1374 
1375 	/* set refresh timer for altering flows to 1 sec. (unit: 20us) */
1376 	mtk_w32(eth, (MTK_HW_LRO_TIMER_UNIT << 16) | MTK_HW_LRO_REFRESH_TIME,
1377 		MTK_PDMA_LRO_ALT_REFRESH_TIMER);
1378 
1379 	/* set HW LRO mode & the max aggregation count for rx packets */
1380 	lro_ctrl_dw3 |= MTK_ADMA_MODE | (MTK_HW_LRO_MAX_AGG_CNT & 0xff);
1381 
1382 	/* the minimal remaining room of SDL0 in RXD for lro aggregation */
1383 	lro_ctrl_dw3 |= MTK_LRO_MIN_RXD_SDL;
1384 
1385 	/* enable HW LRO */
1386 	lro_ctrl_dw0 |= MTK_LRO_EN;
1387 
1388 	mtk_w32(eth, lro_ctrl_dw3, MTK_PDMA_LRO_CTRL_DW3);
1389 	mtk_w32(eth, lro_ctrl_dw0, MTK_PDMA_LRO_CTRL_DW0);
1390 
1391 	return 0;
1392 }
1393 
1394 static void mtk_hwlro_rx_uninit(struct mtk_eth *eth)
1395 {
1396 	int i;
1397 	u32 val;
1398 
1399 	/* relinquish lro rings, flush aggregated packets */
1400 	mtk_w32(eth, MTK_LRO_RING_RELINQUISH_REQ, MTK_PDMA_LRO_CTRL_DW0);
1401 
1402 	/* wait for relinquishments done */
1403 	for (i = 0; i < 10; i++) {
1404 		val = mtk_r32(eth, MTK_PDMA_LRO_CTRL_DW0);
1405 		if (val & MTK_LRO_RING_RELINQUISH_DONE) {
1406 			msleep(20);
1407 			continue;
1408 		}
1409 		break;
1410 	}
1411 
1412 	/* invalidate lro rings */
1413 	for (i = 1; i < MTK_MAX_RX_RING_NUM; i++)
1414 		mtk_w32(eth, 0, MTK_LRO_CTRL_DW2_CFG(i));
1415 
1416 	/* disable HW LRO */
1417 	mtk_w32(eth, 0, MTK_PDMA_LRO_CTRL_DW0);
1418 }
1419 
1420 static void mtk_hwlro_val_ipaddr(struct mtk_eth *eth, int idx, __be32 ip)
1421 {
1422 	u32 reg_val;
1423 
1424 	reg_val = mtk_r32(eth, MTK_LRO_CTRL_DW2_CFG(idx));
1425 
1426 	/* invalidate the IP setting */
1427 	mtk_w32(eth, (reg_val & ~MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1428 
1429 	mtk_w32(eth, ip, MTK_LRO_DIP_DW0_CFG(idx));
1430 
1431 	/* validate the IP setting */
1432 	mtk_w32(eth, (reg_val | MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1433 }
1434 
1435 static void mtk_hwlro_inval_ipaddr(struct mtk_eth *eth, int idx)
1436 {
1437 	u32 reg_val;
1438 
1439 	reg_val = mtk_r32(eth, MTK_LRO_CTRL_DW2_CFG(idx));
1440 
1441 	/* invalidate the IP setting */
1442 	mtk_w32(eth, (reg_val & ~MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1443 
1444 	mtk_w32(eth, 0, MTK_LRO_DIP_DW0_CFG(idx));
1445 }
1446 
1447 static int mtk_hwlro_get_ip_cnt(struct mtk_mac *mac)
1448 {
1449 	int cnt = 0;
1450 	int i;
1451 
1452 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1453 		if (mac->hwlro_ip[i])
1454 			cnt++;
1455 	}
1456 
1457 	return cnt;
1458 }
1459 
1460 static int mtk_hwlro_add_ipaddr(struct net_device *dev,
1461 				struct ethtool_rxnfc *cmd)
1462 {
1463 	struct ethtool_rx_flow_spec *fsp =
1464 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1465 	struct mtk_mac *mac = netdev_priv(dev);
1466 	struct mtk_eth *eth = mac->hw;
1467 	int hwlro_idx;
1468 
1469 	if ((fsp->flow_type != TCP_V4_FLOW) ||
1470 	    (!fsp->h_u.tcp_ip4_spec.ip4dst) ||
1471 	    (fsp->location > 1))
1472 		return -EINVAL;
1473 
1474 	mac->hwlro_ip[fsp->location] = htonl(fsp->h_u.tcp_ip4_spec.ip4dst);
1475 	hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + fsp->location;
1476 
1477 	mac->hwlro_ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1478 
1479 	mtk_hwlro_val_ipaddr(eth, hwlro_idx, mac->hwlro_ip[fsp->location]);
1480 
1481 	return 0;
1482 }
1483 
1484 static int mtk_hwlro_del_ipaddr(struct net_device *dev,
1485 				struct ethtool_rxnfc *cmd)
1486 {
1487 	struct ethtool_rx_flow_spec *fsp =
1488 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1489 	struct mtk_mac *mac = netdev_priv(dev);
1490 	struct mtk_eth *eth = mac->hw;
1491 	int hwlro_idx;
1492 
1493 	if (fsp->location > 1)
1494 		return -EINVAL;
1495 
1496 	mac->hwlro_ip[fsp->location] = 0;
1497 	hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + fsp->location;
1498 
1499 	mac->hwlro_ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1500 
1501 	mtk_hwlro_inval_ipaddr(eth, hwlro_idx);
1502 
1503 	return 0;
1504 }
1505 
1506 static void mtk_hwlro_netdev_disable(struct net_device *dev)
1507 {
1508 	struct mtk_mac *mac = netdev_priv(dev);
1509 	struct mtk_eth *eth = mac->hw;
1510 	int i, hwlro_idx;
1511 
1512 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1513 		mac->hwlro_ip[i] = 0;
1514 		hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + i;
1515 
1516 		mtk_hwlro_inval_ipaddr(eth, hwlro_idx);
1517 	}
1518 
1519 	mac->hwlro_ip_cnt = 0;
1520 }
1521 
1522 static int mtk_hwlro_get_fdir_entry(struct net_device *dev,
1523 				    struct ethtool_rxnfc *cmd)
1524 {
1525 	struct mtk_mac *mac = netdev_priv(dev);
1526 	struct ethtool_rx_flow_spec *fsp =
1527 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1528 
1529 	/* only tcp dst ipv4 is meaningful, others are meaningless */
1530 	fsp->flow_type = TCP_V4_FLOW;
1531 	fsp->h_u.tcp_ip4_spec.ip4dst = ntohl(mac->hwlro_ip[fsp->location]);
1532 	fsp->m_u.tcp_ip4_spec.ip4dst = 0;
1533 
1534 	fsp->h_u.tcp_ip4_spec.ip4src = 0;
1535 	fsp->m_u.tcp_ip4_spec.ip4src = 0xffffffff;
1536 	fsp->h_u.tcp_ip4_spec.psrc = 0;
1537 	fsp->m_u.tcp_ip4_spec.psrc = 0xffff;
1538 	fsp->h_u.tcp_ip4_spec.pdst = 0;
1539 	fsp->m_u.tcp_ip4_spec.pdst = 0xffff;
1540 	fsp->h_u.tcp_ip4_spec.tos = 0;
1541 	fsp->m_u.tcp_ip4_spec.tos = 0xff;
1542 
1543 	return 0;
1544 }
1545 
1546 static int mtk_hwlro_get_fdir_all(struct net_device *dev,
1547 				  struct ethtool_rxnfc *cmd,
1548 				  u32 *rule_locs)
1549 {
1550 	struct mtk_mac *mac = netdev_priv(dev);
1551 	int cnt = 0;
1552 	int i;
1553 
1554 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1555 		if (mac->hwlro_ip[i]) {
1556 			rule_locs[cnt] = i;
1557 			cnt++;
1558 		}
1559 	}
1560 
1561 	cmd->rule_cnt = cnt;
1562 
1563 	return 0;
1564 }
1565 
1566 static netdev_features_t mtk_fix_features(struct net_device *dev,
1567 					  netdev_features_t features)
1568 {
1569 	if (!(features & NETIF_F_LRO)) {
1570 		struct mtk_mac *mac = netdev_priv(dev);
1571 		int ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1572 
1573 		if (ip_cnt) {
1574 			netdev_info(dev, "RX flow is programmed, LRO should keep on\n");
1575 
1576 			features |= NETIF_F_LRO;
1577 		}
1578 	}
1579 
1580 	return features;
1581 }
1582 
1583 static int mtk_set_features(struct net_device *dev, netdev_features_t features)
1584 {
1585 	int err = 0;
1586 
1587 	if (!((dev->features ^ features) & NETIF_F_LRO))
1588 		return 0;
1589 
1590 	if (!(features & NETIF_F_LRO))
1591 		mtk_hwlro_netdev_disable(dev);
1592 
1593 	return err;
1594 }
1595 
1596 /* wait for DMA to finish whatever it is doing before we start using it again */
1597 static int mtk_dma_busy_wait(struct mtk_eth *eth)
1598 {
1599 	unsigned long t_start = jiffies;
1600 
1601 	while (1) {
1602 		if (!(mtk_r32(eth, MTK_QDMA_GLO_CFG) &
1603 		      (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)))
1604 			return 0;
1605 		if (time_after(jiffies, t_start + MTK_DMA_BUSY_TIMEOUT))
1606 			break;
1607 	}
1608 
1609 	dev_err(eth->dev, "DMA init timeout\n");
1610 	return -1;
1611 }
1612 
1613 static int mtk_dma_init(struct mtk_eth *eth)
1614 {
1615 	int err;
1616 	u32 i;
1617 
1618 	if (mtk_dma_busy_wait(eth))
1619 		return -EBUSY;
1620 
1621 	/* QDMA needs scratch memory for internal reordering of the
1622 	 * descriptors
1623 	 */
1624 	err = mtk_init_fq_dma(eth);
1625 	if (err)
1626 		return err;
1627 
1628 	err = mtk_tx_alloc(eth);
1629 	if (err)
1630 		return err;
1631 
1632 	err = mtk_rx_alloc(eth, 0, MTK_RX_FLAGS_NORMAL);
1633 	if (err)
1634 		return err;
1635 
1636 	if (eth->hwlro) {
1637 		for (i = 1; i < MTK_MAX_RX_RING_NUM; i++) {
1638 			err = mtk_rx_alloc(eth, i, MTK_RX_FLAGS_HWLRO);
1639 			if (err)
1640 				return err;
1641 		}
1642 		err = mtk_hwlro_rx_init(eth);
1643 		if (err)
1644 			return err;
1645 	}
1646 
1647 	/* Enable random early drop and set drop threshold automatically */
1648 	mtk_w32(eth, FC_THRES_DROP_MODE | FC_THRES_DROP_EN | FC_THRES_MIN,
1649 		MTK_QDMA_FC_THRES);
1650 	mtk_w32(eth, 0x0, MTK_QDMA_HRED2);
1651 
1652 	return 0;
1653 }
1654 
1655 static void mtk_dma_free(struct mtk_eth *eth)
1656 {
1657 	int i;
1658 
1659 	for (i = 0; i < MTK_MAC_COUNT; i++)
1660 		if (eth->netdev[i])
1661 			netdev_reset_queue(eth->netdev[i]);
1662 	if (eth->scratch_ring) {
1663 		dma_free_coherent(eth->dev,
1664 				  MTK_DMA_SIZE * sizeof(struct mtk_tx_dma),
1665 				  eth->scratch_ring,
1666 				  eth->phy_scratch_ring);
1667 		eth->scratch_ring = NULL;
1668 		eth->phy_scratch_ring = 0;
1669 	}
1670 	mtk_tx_clean(eth);
1671 	mtk_rx_clean(eth, 0);
1672 
1673 	if (eth->hwlro) {
1674 		mtk_hwlro_rx_uninit(eth);
1675 		for (i = 1; i < MTK_MAX_RX_RING_NUM; i++)
1676 			mtk_rx_clean(eth, i);
1677 	}
1678 
1679 	kfree(eth->scratch_head);
1680 }
1681 
1682 static void mtk_tx_timeout(struct net_device *dev)
1683 {
1684 	struct mtk_mac *mac = netdev_priv(dev);
1685 	struct mtk_eth *eth = mac->hw;
1686 
1687 	eth->netdev[mac->id]->stats.tx_errors++;
1688 	netif_err(eth, tx_err, dev,
1689 		  "transmit timed out\n");
1690 	schedule_work(&eth->pending_work);
1691 }
1692 
1693 static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
1694 {
1695 	struct mtk_eth *eth = _eth;
1696 
1697 	if (likely(napi_schedule_prep(&eth->rx_napi))) {
1698 		__napi_schedule(&eth->rx_napi);
1699 		mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1700 	}
1701 
1702 	return IRQ_HANDLED;
1703 }
1704 
1705 static irqreturn_t mtk_handle_irq_tx(int irq, void *_eth)
1706 {
1707 	struct mtk_eth *eth = _eth;
1708 
1709 	if (likely(napi_schedule_prep(&eth->tx_napi))) {
1710 		__napi_schedule(&eth->tx_napi);
1711 		mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1712 	}
1713 
1714 	return IRQ_HANDLED;
1715 }
1716 
1717 #ifdef CONFIG_NET_POLL_CONTROLLER
1718 static void mtk_poll_controller(struct net_device *dev)
1719 {
1720 	struct mtk_mac *mac = netdev_priv(dev);
1721 	struct mtk_eth *eth = mac->hw;
1722 
1723 	mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1724 	mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1725 	mtk_handle_irq_rx(eth->irq[2], dev);
1726 	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1727 	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1728 }
1729 #endif
1730 
1731 static int mtk_start_dma(struct mtk_eth *eth)
1732 {
1733 	int err;
1734 
1735 	err = mtk_dma_init(eth);
1736 	if (err) {
1737 		mtk_dma_free(eth);
1738 		return err;
1739 	}
1740 
1741 	mtk_w32(eth,
1742 		MTK_TX_WB_DDONE | MTK_TX_DMA_EN |
1743 		MTK_DMA_SIZE_16DWORDS | MTK_NDP_CO_PRO,
1744 		MTK_QDMA_GLO_CFG);
1745 
1746 	mtk_w32(eth,
1747 		MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
1748 		MTK_RX_BT_32DWORDS | MTK_MULTI_EN,
1749 		MTK_PDMA_GLO_CFG);
1750 
1751 	return 0;
1752 }
1753 
1754 static int mtk_open(struct net_device *dev)
1755 {
1756 	struct mtk_mac *mac = netdev_priv(dev);
1757 	struct mtk_eth *eth = mac->hw;
1758 
1759 	/* we run 2 netdevs on the same dma ring so we only bring it up once */
1760 	if (!atomic_read(&eth->dma_refcnt)) {
1761 		int err = mtk_start_dma(eth);
1762 
1763 		if (err)
1764 			return err;
1765 
1766 		napi_enable(&eth->tx_napi);
1767 		napi_enable(&eth->rx_napi);
1768 		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1769 		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1770 	}
1771 	atomic_inc(&eth->dma_refcnt);
1772 
1773 	phy_start(dev->phydev);
1774 	netif_start_queue(dev);
1775 
1776 	return 0;
1777 }
1778 
1779 static void mtk_stop_dma(struct mtk_eth *eth, u32 glo_cfg)
1780 {
1781 	u32 val;
1782 	int i;
1783 
1784 	/* stop the dma engine */
1785 	spin_lock_bh(&eth->page_lock);
1786 	val = mtk_r32(eth, glo_cfg);
1787 	mtk_w32(eth, val & ~(MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN),
1788 		glo_cfg);
1789 	spin_unlock_bh(&eth->page_lock);
1790 
1791 	/* wait for dma stop */
1792 	for (i = 0; i < 10; i++) {
1793 		val = mtk_r32(eth, glo_cfg);
1794 		if (val & (MTK_TX_DMA_BUSY | MTK_RX_DMA_BUSY)) {
1795 			msleep(20);
1796 			continue;
1797 		}
1798 		break;
1799 	}
1800 }
1801 
1802 static int mtk_stop(struct net_device *dev)
1803 {
1804 	struct mtk_mac *mac = netdev_priv(dev);
1805 	struct mtk_eth *eth = mac->hw;
1806 
1807 	netif_tx_disable(dev);
1808 	phy_stop(dev->phydev);
1809 
1810 	/* only shutdown DMA if this is the last user */
1811 	if (!atomic_dec_and_test(&eth->dma_refcnt))
1812 		return 0;
1813 
1814 	mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1815 	mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1816 	napi_disable(&eth->tx_napi);
1817 	napi_disable(&eth->rx_napi);
1818 
1819 	mtk_stop_dma(eth, MTK_QDMA_GLO_CFG);
1820 	mtk_stop_dma(eth, MTK_PDMA_GLO_CFG);
1821 
1822 	mtk_dma_free(eth);
1823 
1824 	return 0;
1825 }
1826 
1827 static void ethsys_reset(struct mtk_eth *eth, u32 reset_bits)
1828 {
1829 	regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
1830 			   reset_bits,
1831 			   reset_bits);
1832 
1833 	usleep_range(1000, 1100);
1834 	regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
1835 			   reset_bits,
1836 			   ~reset_bits);
1837 	mdelay(10);
1838 }
1839 
1840 static int mtk_hw_init(struct mtk_eth *eth)
1841 {
1842 	int i, val;
1843 
1844 	if (test_and_set_bit(MTK_HW_INIT, &eth->state))
1845 		return 0;
1846 
1847 	pm_runtime_enable(eth->dev);
1848 	pm_runtime_get_sync(eth->dev);
1849 
1850 	clk_prepare_enable(eth->clks[MTK_CLK_ETHIF]);
1851 	clk_prepare_enable(eth->clks[MTK_CLK_ESW]);
1852 	clk_prepare_enable(eth->clks[MTK_CLK_GP1]);
1853 	clk_prepare_enable(eth->clks[MTK_CLK_GP2]);
1854 	ethsys_reset(eth, RSTCTRL_FE);
1855 	ethsys_reset(eth, RSTCTRL_PPE);
1856 
1857 	regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
1858 	for (i = 0; i < MTK_MAC_COUNT; i++) {
1859 		if (!eth->mac[i])
1860 			continue;
1861 		val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, eth->mac[i]->id);
1862 		val |= SYSCFG0_GE_MODE(eth->mac[i]->ge_mode, eth->mac[i]->id);
1863 	}
1864 	regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
1865 
1866 	/* Set GE2 driving and slew rate */
1867 	regmap_write(eth->pctl, GPIO_DRV_SEL10, 0xa00);
1868 
1869 	/* set GE2 TDSEL */
1870 	regmap_write(eth->pctl, GPIO_OD33_CTRL8, 0x5);
1871 
1872 	/* set GE2 TUNE */
1873 	regmap_write(eth->pctl, GPIO_BIAS_CTRL, 0x0);
1874 
1875 	/* GE1, Force 1000M/FD, FC ON */
1876 	mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(0));
1877 
1878 	/* GE2, Force 1000M/FD, FC ON */
1879 	mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
1880 
1881 	/* Indicates CDM to parse the MTK special tag from CPU
1882 	 * which also is working out for untag packets.
1883 	 */
1884 	val = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
1885 	mtk_w32(eth, val | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
1886 
1887 	/* Enable RX VLan Offloading */
1888 	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
1889 
1890 	/* enable interrupt delay for RX */
1891 	mtk_w32(eth, MTK_PDMA_DELAY_RX_DELAY, MTK_PDMA_DELAY_INT);
1892 
1893 	/* disable delay and normal interrupt */
1894 	mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
1895 	mtk_tx_irq_disable(eth, ~0);
1896 	mtk_rx_irq_disable(eth, ~0);
1897 	mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
1898 	mtk_w32(eth, 0, MTK_RST_GL);
1899 
1900 	/* FE int grouping */
1901 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_PDMA_INT_GRP1);
1902 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_GRP2);
1903 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_QDMA_INT_GRP1);
1904 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_QDMA_INT_GRP2);
1905 	mtk_w32(eth, 0x21021000, MTK_FE_INT_GRP);
1906 
1907 	for (i = 0; i < 2; i++) {
1908 		u32 val = mtk_r32(eth, MTK_GDMA_FWD_CFG(i));
1909 
1910 		/* setup the forward port to send frame to PDMA */
1911 		val &= ~0xffff;
1912 
1913 		/* Enable RX checksum */
1914 		val |= MTK_GDMA_ICS_EN | MTK_GDMA_TCS_EN | MTK_GDMA_UCS_EN;
1915 
1916 		/* setup the mac dma */
1917 		mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
1918 	}
1919 
1920 	return 0;
1921 }
1922 
1923 static int mtk_hw_deinit(struct mtk_eth *eth)
1924 {
1925 	if (!test_and_clear_bit(MTK_HW_INIT, &eth->state))
1926 		return 0;
1927 
1928 	clk_disable_unprepare(eth->clks[MTK_CLK_GP2]);
1929 	clk_disable_unprepare(eth->clks[MTK_CLK_GP1]);
1930 	clk_disable_unprepare(eth->clks[MTK_CLK_ESW]);
1931 	clk_disable_unprepare(eth->clks[MTK_CLK_ETHIF]);
1932 
1933 	pm_runtime_put_sync(eth->dev);
1934 	pm_runtime_disable(eth->dev);
1935 
1936 	return 0;
1937 }
1938 
1939 static int __init mtk_init(struct net_device *dev)
1940 {
1941 	struct mtk_mac *mac = netdev_priv(dev);
1942 	struct mtk_eth *eth = mac->hw;
1943 	const char *mac_addr;
1944 
1945 	mac_addr = of_get_mac_address(mac->of_node);
1946 	if (mac_addr)
1947 		ether_addr_copy(dev->dev_addr, mac_addr);
1948 
1949 	/* If the mac address is invalid, use random mac address  */
1950 	if (!is_valid_ether_addr(dev->dev_addr)) {
1951 		eth_hw_addr_random(dev);
1952 		dev_err(eth->dev, "generated random MAC address %pM\n",
1953 			dev->dev_addr);
1954 	}
1955 
1956 	return mtk_phy_connect(dev);
1957 }
1958 
1959 static void mtk_uninit(struct net_device *dev)
1960 {
1961 	struct mtk_mac *mac = netdev_priv(dev);
1962 	struct mtk_eth *eth = mac->hw;
1963 
1964 	phy_disconnect(dev->phydev);
1965 	if (of_phy_is_fixed_link(mac->of_node))
1966 		of_phy_deregister_fixed_link(mac->of_node);
1967 	mtk_tx_irq_disable(eth, ~0);
1968 	mtk_rx_irq_disable(eth, ~0);
1969 }
1970 
1971 static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1972 {
1973 	switch (cmd) {
1974 	case SIOCGMIIPHY:
1975 	case SIOCGMIIREG:
1976 	case SIOCSMIIREG:
1977 		return phy_mii_ioctl(dev->phydev, ifr, cmd);
1978 	default:
1979 		break;
1980 	}
1981 
1982 	return -EOPNOTSUPP;
1983 }
1984 
1985 static void mtk_pending_work(struct work_struct *work)
1986 {
1987 	struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work);
1988 	int err, i;
1989 	unsigned long restart = 0;
1990 
1991 	rtnl_lock();
1992 
1993 	dev_dbg(eth->dev, "[%s][%d] reset\n", __func__, __LINE__);
1994 
1995 	while (test_and_set_bit_lock(MTK_RESETTING, &eth->state))
1996 		cpu_relax();
1997 
1998 	dev_dbg(eth->dev, "[%s][%d] mtk_stop starts\n", __func__, __LINE__);
1999 	/* stop all devices to make sure that dma is properly shut down */
2000 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2001 		if (!eth->netdev[i])
2002 			continue;
2003 		mtk_stop(eth->netdev[i]);
2004 		__set_bit(i, &restart);
2005 	}
2006 	dev_dbg(eth->dev, "[%s][%d] mtk_stop ends\n", __func__, __LINE__);
2007 
2008 	/* restart underlying hardware such as power, clock, pin mux
2009 	 * and the connected phy
2010 	 */
2011 	mtk_hw_deinit(eth);
2012 
2013 	if (eth->dev->pins)
2014 		pinctrl_select_state(eth->dev->pins->p,
2015 				     eth->dev->pins->default_state);
2016 	mtk_hw_init(eth);
2017 
2018 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2019 		if (!eth->mac[i] ||
2020 		    of_phy_is_fixed_link(eth->mac[i]->of_node))
2021 			continue;
2022 		err = phy_init_hw(eth->netdev[i]->phydev);
2023 		if (err)
2024 			dev_err(eth->dev, "%s: PHY init failed.\n",
2025 				eth->netdev[i]->name);
2026 	}
2027 
2028 	/* restart DMA and enable IRQs */
2029 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2030 		if (!test_bit(i, &restart))
2031 			continue;
2032 		err = mtk_open(eth->netdev[i]);
2033 		if (err) {
2034 			netif_alert(eth, ifup, eth->netdev[i],
2035 			      "Driver up/down cycle failed, closing device.\n");
2036 			dev_close(eth->netdev[i]);
2037 		}
2038 	}
2039 
2040 	dev_dbg(eth->dev, "[%s][%d] reset done\n", __func__, __LINE__);
2041 
2042 	clear_bit_unlock(MTK_RESETTING, &eth->state);
2043 
2044 	rtnl_unlock();
2045 }
2046 
2047 static int mtk_free_dev(struct mtk_eth *eth)
2048 {
2049 	int i;
2050 
2051 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2052 		if (!eth->netdev[i])
2053 			continue;
2054 		free_netdev(eth->netdev[i]);
2055 	}
2056 
2057 	return 0;
2058 }
2059 
2060 static int mtk_unreg_dev(struct mtk_eth *eth)
2061 {
2062 	int i;
2063 
2064 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2065 		if (!eth->netdev[i])
2066 			continue;
2067 		unregister_netdev(eth->netdev[i]);
2068 	}
2069 
2070 	return 0;
2071 }
2072 
2073 static int mtk_cleanup(struct mtk_eth *eth)
2074 {
2075 	mtk_unreg_dev(eth);
2076 	mtk_free_dev(eth);
2077 	cancel_work_sync(&eth->pending_work);
2078 
2079 	return 0;
2080 }
2081 
2082 static int mtk_get_link_ksettings(struct net_device *ndev,
2083 				  struct ethtool_link_ksettings *cmd)
2084 {
2085 	struct mtk_mac *mac = netdev_priv(ndev);
2086 
2087 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2088 		return -EBUSY;
2089 
2090 	phy_ethtool_ksettings_get(ndev->phydev, cmd);
2091 
2092 	return 0;
2093 }
2094 
2095 static int mtk_set_link_ksettings(struct net_device *ndev,
2096 				  const struct ethtool_link_ksettings *cmd)
2097 {
2098 	struct mtk_mac *mac = netdev_priv(ndev);
2099 
2100 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2101 		return -EBUSY;
2102 
2103 	return phy_ethtool_ksettings_set(ndev->phydev, cmd);
2104 }
2105 
2106 static void mtk_get_drvinfo(struct net_device *dev,
2107 			    struct ethtool_drvinfo *info)
2108 {
2109 	struct mtk_mac *mac = netdev_priv(dev);
2110 
2111 	strlcpy(info->driver, mac->hw->dev->driver->name, sizeof(info->driver));
2112 	strlcpy(info->bus_info, dev_name(mac->hw->dev), sizeof(info->bus_info));
2113 	info->n_stats = ARRAY_SIZE(mtk_ethtool_stats);
2114 }
2115 
2116 static u32 mtk_get_msglevel(struct net_device *dev)
2117 {
2118 	struct mtk_mac *mac = netdev_priv(dev);
2119 
2120 	return mac->hw->msg_enable;
2121 }
2122 
2123 static void mtk_set_msglevel(struct net_device *dev, u32 value)
2124 {
2125 	struct mtk_mac *mac = netdev_priv(dev);
2126 
2127 	mac->hw->msg_enable = value;
2128 }
2129 
2130 static int mtk_nway_reset(struct net_device *dev)
2131 {
2132 	struct mtk_mac *mac = netdev_priv(dev);
2133 
2134 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2135 		return -EBUSY;
2136 
2137 	return genphy_restart_aneg(dev->phydev);
2138 }
2139 
2140 static u32 mtk_get_link(struct net_device *dev)
2141 {
2142 	struct mtk_mac *mac = netdev_priv(dev);
2143 	int err;
2144 
2145 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2146 		return -EBUSY;
2147 
2148 	err = genphy_update_link(dev->phydev);
2149 	if (err)
2150 		return ethtool_op_get_link(dev);
2151 
2152 	return dev->phydev->link;
2153 }
2154 
2155 static void mtk_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2156 {
2157 	int i;
2158 
2159 	switch (stringset) {
2160 	case ETH_SS_STATS:
2161 		for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++) {
2162 			memcpy(data, mtk_ethtool_stats[i].str, ETH_GSTRING_LEN);
2163 			data += ETH_GSTRING_LEN;
2164 		}
2165 		break;
2166 	}
2167 }
2168 
2169 static int mtk_get_sset_count(struct net_device *dev, int sset)
2170 {
2171 	switch (sset) {
2172 	case ETH_SS_STATS:
2173 		return ARRAY_SIZE(mtk_ethtool_stats);
2174 	default:
2175 		return -EOPNOTSUPP;
2176 	}
2177 }
2178 
2179 static void mtk_get_ethtool_stats(struct net_device *dev,
2180 				  struct ethtool_stats *stats, u64 *data)
2181 {
2182 	struct mtk_mac *mac = netdev_priv(dev);
2183 	struct mtk_hw_stats *hwstats = mac->hw_stats;
2184 	u64 *data_src, *data_dst;
2185 	unsigned int start;
2186 	int i;
2187 
2188 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2189 		return;
2190 
2191 	if (netif_running(dev) && netif_device_present(dev)) {
2192 		if (spin_trylock_bh(&hwstats->stats_lock)) {
2193 			mtk_stats_update_mac(mac);
2194 			spin_unlock_bh(&hwstats->stats_lock);
2195 		}
2196 	}
2197 
2198 	data_src = (u64 *)hwstats;
2199 
2200 	do {
2201 		data_dst = data;
2202 		start = u64_stats_fetch_begin_irq(&hwstats->syncp);
2203 
2204 		for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++)
2205 			*data_dst++ = *(data_src + mtk_ethtool_stats[i].offset);
2206 	} while (u64_stats_fetch_retry_irq(&hwstats->syncp, start));
2207 }
2208 
2209 static int mtk_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
2210 			 u32 *rule_locs)
2211 {
2212 	int ret = -EOPNOTSUPP;
2213 
2214 	switch (cmd->cmd) {
2215 	case ETHTOOL_GRXRINGS:
2216 		if (dev->features & NETIF_F_LRO) {
2217 			cmd->data = MTK_MAX_RX_RING_NUM;
2218 			ret = 0;
2219 		}
2220 		break;
2221 	case ETHTOOL_GRXCLSRLCNT:
2222 		if (dev->features & NETIF_F_LRO) {
2223 			struct mtk_mac *mac = netdev_priv(dev);
2224 
2225 			cmd->rule_cnt = mac->hwlro_ip_cnt;
2226 			ret = 0;
2227 		}
2228 		break;
2229 	case ETHTOOL_GRXCLSRULE:
2230 		if (dev->features & NETIF_F_LRO)
2231 			ret = mtk_hwlro_get_fdir_entry(dev, cmd);
2232 		break;
2233 	case ETHTOOL_GRXCLSRLALL:
2234 		if (dev->features & NETIF_F_LRO)
2235 			ret = mtk_hwlro_get_fdir_all(dev, cmd,
2236 						     rule_locs);
2237 		break;
2238 	default:
2239 		break;
2240 	}
2241 
2242 	return ret;
2243 }
2244 
2245 static int mtk_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
2246 {
2247 	int ret = -EOPNOTSUPP;
2248 
2249 	switch (cmd->cmd) {
2250 	case ETHTOOL_SRXCLSRLINS:
2251 		if (dev->features & NETIF_F_LRO)
2252 			ret = mtk_hwlro_add_ipaddr(dev, cmd);
2253 		break;
2254 	case ETHTOOL_SRXCLSRLDEL:
2255 		if (dev->features & NETIF_F_LRO)
2256 			ret = mtk_hwlro_del_ipaddr(dev, cmd);
2257 		break;
2258 	default:
2259 		break;
2260 	}
2261 
2262 	return ret;
2263 }
2264 
2265 static const struct ethtool_ops mtk_ethtool_ops = {
2266 	.get_link_ksettings	= mtk_get_link_ksettings,
2267 	.set_link_ksettings	= mtk_set_link_ksettings,
2268 	.get_drvinfo		= mtk_get_drvinfo,
2269 	.get_msglevel		= mtk_get_msglevel,
2270 	.set_msglevel		= mtk_set_msglevel,
2271 	.nway_reset		= mtk_nway_reset,
2272 	.get_link		= mtk_get_link,
2273 	.get_strings		= mtk_get_strings,
2274 	.get_sset_count		= mtk_get_sset_count,
2275 	.get_ethtool_stats	= mtk_get_ethtool_stats,
2276 	.get_rxnfc		= mtk_get_rxnfc,
2277 	.set_rxnfc              = mtk_set_rxnfc,
2278 };
2279 
2280 static const struct net_device_ops mtk_netdev_ops = {
2281 	.ndo_init		= mtk_init,
2282 	.ndo_uninit		= mtk_uninit,
2283 	.ndo_open		= mtk_open,
2284 	.ndo_stop		= mtk_stop,
2285 	.ndo_start_xmit		= mtk_start_xmit,
2286 	.ndo_set_mac_address	= mtk_set_mac_address,
2287 	.ndo_validate_addr	= eth_validate_addr,
2288 	.ndo_do_ioctl		= mtk_do_ioctl,
2289 	.ndo_tx_timeout		= mtk_tx_timeout,
2290 	.ndo_get_stats64        = mtk_get_stats64,
2291 	.ndo_fix_features	= mtk_fix_features,
2292 	.ndo_set_features	= mtk_set_features,
2293 #ifdef CONFIG_NET_POLL_CONTROLLER
2294 	.ndo_poll_controller	= mtk_poll_controller,
2295 #endif
2296 };
2297 
2298 static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
2299 {
2300 	struct mtk_mac *mac;
2301 	const __be32 *_id = of_get_property(np, "reg", NULL);
2302 	int id, err;
2303 
2304 	if (!_id) {
2305 		dev_err(eth->dev, "missing mac id\n");
2306 		return -EINVAL;
2307 	}
2308 
2309 	id = be32_to_cpup(_id);
2310 	if (id >= MTK_MAC_COUNT) {
2311 		dev_err(eth->dev, "%d is not a valid mac id\n", id);
2312 		return -EINVAL;
2313 	}
2314 
2315 	if (eth->netdev[id]) {
2316 		dev_err(eth->dev, "duplicate mac id found: %d\n", id);
2317 		return -EINVAL;
2318 	}
2319 
2320 	eth->netdev[id] = alloc_etherdev(sizeof(*mac));
2321 	if (!eth->netdev[id]) {
2322 		dev_err(eth->dev, "alloc_etherdev failed\n");
2323 		return -ENOMEM;
2324 	}
2325 	mac = netdev_priv(eth->netdev[id]);
2326 	eth->mac[id] = mac;
2327 	mac->id = id;
2328 	mac->hw = eth;
2329 	mac->of_node = np;
2330 
2331 	memset(mac->hwlro_ip, 0, sizeof(mac->hwlro_ip));
2332 	mac->hwlro_ip_cnt = 0;
2333 
2334 	mac->hw_stats = devm_kzalloc(eth->dev,
2335 				     sizeof(*mac->hw_stats),
2336 				     GFP_KERNEL);
2337 	if (!mac->hw_stats) {
2338 		dev_err(eth->dev, "failed to allocate counter memory\n");
2339 		err = -ENOMEM;
2340 		goto free_netdev;
2341 	}
2342 	spin_lock_init(&mac->hw_stats->stats_lock);
2343 	u64_stats_init(&mac->hw_stats->syncp);
2344 	mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
2345 
2346 	SET_NETDEV_DEV(eth->netdev[id], eth->dev);
2347 	eth->netdev[id]->watchdog_timeo = 5 * HZ;
2348 	eth->netdev[id]->netdev_ops = &mtk_netdev_ops;
2349 	eth->netdev[id]->base_addr = (unsigned long)eth->base;
2350 
2351 	eth->netdev[id]->hw_features = MTK_HW_FEATURES;
2352 	if (eth->hwlro)
2353 		eth->netdev[id]->hw_features |= NETIF_F_LRO;
2354 
2355 	eth->netdev[id]->vlan_features = MTK_HW_FEATURES &
2356 		~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX);
2357 	eth->netdev[id]->features |= MTK_HW_FEATURES;
2358 	eth->netdev[id]->ethtool_ops = &mtk_ethtool_ops;
2359 
2360 	eth->netdev[id]->irq = eth->irq[0];
2361 	eth->netdev[id]->dev.of_node = np;
2362 
2363 	return 0;
2364 
2365 free_netdev:
2366 	free_netdev(eth->netdev[id]);
2367 	return err;
2368 }
2369 
2370 static int mtk_get_chip_id(struct mtk_eth *eth, u32 *chip_id)
2371 {
2372 	u32 val[2], id[4];
2373 
2374 	regmap_read(eth->ethsys, ETHSYS_CHIPID0_3, &val[0]);
2375 	regmap_read(eth->ethsys, ETHSYS_CHIPID4_7, &val[1]);
2376 
2377 	id[3] = ((val[0] >> 16) & 0xff) - '0';
2378 	id[2] = ((val[0] >> 24) & 0xff) - '0';
2379 	id[1] = (val[1] & 0xff) - '0';
2380 	id[0] = ((val[1] >> 8) & 0xff) - '0';
2381 
2382 	*chip_id = (id[3] * 1000) + (id[2] * 100) +
2383 		   (id[1] * 10) + id[0];
2384 
2385 	if (!(*chip_id)) {
2386 		dev_err(eth->dev, "failed to get chip id\n");
2387 		return -ENODEV;
2388 	}
2389 
2390 	dev_info(eth->dev, "chip id = %d\n", *chip_id);
2391 
2392 	return 0;
2393 }
2394 
2395 static bool mtk_is_hwlro_supported(struct mtk_eth *eth)
2396 {
2397 	switch (eth->chip_id) {
2398 	case MT7623_ETH:
2399 		return true;
2400 	}
2401 
2402 	return false;
2403 }
2404 
2405 static int mtk_probe(struct platform_device *pdev)
2406 {
2407 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2408 	struct device_node *mac_np;
2409 	struct mtk_eth *eth;
2410 	int err;
2411 	int i;
2412 
2413 	eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);
2414 	if (!eth)
2415 		return -ENOMEM;
2416 
2417 	eth->dev = &pdev->dev;
2418 	eth->base = devm_ioremap_resource(&pdev->dev, res);
2419 	if (IS_ERR(eth->base))
2420 		return PTR_ERR(eth->base);
2421 
2422 	spin_lock_init(&eth->page_lock);
2423 	spin_lock_init(&eth->tx_irq_lock);
2424 	spin_lock_init(&eth->rx_irq_lock);
2425 
2426 	eth->ethsys = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
2427 						      "mediatek,ethsys");
2428 	if (IS_ERR(eth->ethsys)) {
2429 		dev_err(&pdev->dev, "no ethsys regmap found\n");
2430 		return PTR_ERR(eth->ethsys);
2431 	}
2432 
2433 	eth->pctl = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
2434 						    "mediatek,pctl");
2435 	if (IS_ERR(eth->pctl)) {
2436 		dev_err(&pdev->dev, "no pctl regmap found\n");
2437 		return PTR_ERR(eth->pctl);
2438 	}
2439 
2440 	for (i = 0; i < 3; i++) {
2441 		eth->irq[i] = platform_get_irq(pdev, i);
2442 		if (eth->irq[i] < 0) {
2443 			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
2444 			return -ENXIO;
2445 		}
2446 	}
2447 	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
2448 		eth->clks[i] = devm_clk_get(eth->dev,
2449 					    mtk_clks_source_name[i]);
2450 		if (IS_ERR(eth->clks[i])) {
2451 			if (PTR_ERR(eth->clks[i]) == -EPROBE_DEFER)
2452 				return -EPROBE_DEFER;
2453 			return -ENODEV;
2454 		}
2455 	}
2456 
2457 	eth->msg_enable = netif_msg_init(mtk_msg_level, MTK_DEFAULT_MSG_ENABLE);
2458 	INIT_WORK(&eth->pending_work, mtk_pending_work);
2459 
2460 	err = mtk_hw_init(eth);
2461 	if (err)
2462 		return err;
2463 
2464 	err = mtk_get_chip_id(eth, &eth->chip_id);
2465 	if (err)
2466 		return err;
2467 
2468 	eth->hwlro = mtk_is_hwlro_supported(eth);
2469 
2470 	for_each_child_of_node(pdev->dev.of_node, mac_np) {
2471 		if (!of_device_is_compatible(mac_np,
2472 					     "mediatek,eth-mac"))
2473 			continue;
2474 
2475 		if (!of_device_is_available(mac_np))
2476 			continue;
2477 
2478 		err = mtk_add_mac(eth, mac_np);
2479 		if (err)
2480 			goto err_deinit_hw;
2481 	}
2482 
2483 	err = devm_request_irq(eth->dev, eth->irq[1], mtk_handle_irq_tx, 0,
2484 			       dev_name(eth->dev), eth);
2485 	if (err)
2486 		goto err_free_dev;
2487 
2488 	err = devm_request_irq(eth->dev, eth->irq[2], mtk_handle_irq_rx, 0,
2489 			       dev_name(eth->dev), eth);
2490 	if (err)
2491 		goto err_free_dev;
2492 
2493 	err = mtk_mdio_init(eth);
2494 	if (err)
2495 		goto err_free_dev;
2496 
2497 	for (i = 0; i < MTK_MAX_DEVS; i++) {
2498 		if (!eth->netdev[i])
2499 			continue;
2500 
2501 		err = register_netdev(eth->netdev[i]);
2502 		if (err) {
2503 			dev_err(eth->dev, "error bringing up device\n");
2504 			goto err_deinit_mdio;
2505 		} else
2506 			netif_info(eth, probe, eth->netdev[i],
2507 				   "mediatek frame engine at 0x%08lx, irq %d\n",
2508 				   eth->netdev[i]->base_addr, eth->irq[0]);
2509 	}
2510 
2511 	/* we run 2 devices on the same DMA ring so we need a dummy device
2512 	 * for NAPI to work
2513 	 */
2514 	init_dummy_netdev(&eth->dummy_dev);
2515 	netif_napi_add(&eth->dummy_dev, &eth->tx_napi, mtk_napi_tx,
2516 		       MTK_NAPI_WEIGHT);
2517 	netif_napi_add(&eth->dummy_dev, &eth->rx_napi, mtk_napi_rx,
2518 		       MTK_NAPI_WEIGHT);
2519 
2520 	platform_set_drvdata(pdev, eth);
2521 
2522 	return 0;
2523 
2524 err_deinit_mdio:
2525 	mtk_mdio_cleanup(eth);
2526 err_free_dev:
2527 	mtk_free_dev(eth);
2528 err_deinit_hw:
2529 	mtk_hw_deinit(eth);
2530 
2531 	return err;
2532 }
2533 
2534 static int mtk_remove(struct platform_device *pdev)
2535 {
2536 	struct mtk_eth *eth = platform_get_drvdata(pdev);
2537 	int i;
2538 
2539 	/* stop all devices to make sure that dma is properly shut down */
2540 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2541 		if (!eth->netdev[i])
2542 			continue;
2543 		mtk_stop(eth->netdev[i]);
2544 	}
2545 
2546 	mtk_hw_deinit(eth);
2547 
2548 	netif_napi_del(&eth->tx_napi);
2549 	netif_napi_del(&eth->rx_napi);
2550 	mtk_cleanup(eth);
2551 	mtk_mdio_cleanup(eth);
2552 
2553 	return 0;
2554 }
2555 
2556 const struct of_device_id of_mtk_match[] = {
2557 	{ .compatible = "mediatek,mt2701-eth" },
2558 	{},
2559 };
2560 MODULE_DEVICE_TABLE(of, of_mtk_match);
2561 
2562 static struct platform_driver mtk_driver = {
2563 	.probe = mtk_probe,
2564 	.remove = mtk_remove,
2565 	.driver = {
2566 		.name = "mtk_soc_eth",
2567 		.of_match_table = of_mtk_match,
2568 	},
2569 };
2570 
2571 module_platform_driver(mtk_driver);
2572 
2573 MODULE_LICENSE("GPL");
2574 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
2575 MODULE_DESCRIPTION("Ethernet driver for MediaTek SoC");
2576