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