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 #include <linux/pinctrl/devinfo.h>
27 
28 #include "mtk_eth_soc.h"
29 
30 static int mtk_msg_level = -1;
31 module_param_named(msg_level, mtk_msg_level, int, 0);
32 MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
33 
34 #define MTK_ETHTOOL_STAT(x) { #x, \
35 			      offsetof(struct mtk_hw_stats, x) / sizeof(u64) }
36 
37 /* strings used by ethtool */
38 static const struct mtk_ethtool_stats {
39 	char str[ETH_GSTRING_LEN];
40 	u32 offset;
41 } mtk_ethtool_stats[] = {
42 	MTK_ETHTOOL_STAT(tx_bytes),
43 	MTK_ETHTOOL_STAT(tx_packets),
44 	MTK_ETHTOOL_STAT(tx_skip),
45 	MTK_ETHTOOL_STAT(tx_collisions),
46 	MTK_ETHTOOL_STAT(rx_bytes),
47 	MTK_ETHTOOL_STAT(rx_packets),
48 	MTK_ETHTOOL_STAT(rx_overflow),
49 	MTK_ETHTOOL_STAT(rx_fcs_errors),
50 	MTK_ETHTOOL_STAT(rx_short_errors),
51 	MTK_ETHTOOL_STAT(rx_long_errors),
52 	MTK_ETHTOOL_STAT(rx_checksum_errors),
53 	MTK_ETHTOOL_STAT(rx_flow_control_packets),
54 };
55 
56 static const char * const mtk_clks_source_name[] = {
57 	"ethif", "esw", "gp0", "gp1", "gp2", "trgpll", "sgmii_tx250m",
58 	"sgmii_rx250m", "sgmii_cdr_ref", "sgmii_cdr_fb", "sgmii_ck", "eth2pll"
59 };
60 
61 void mtk_w32(struct mtk_eth *eth, u32 val, unsigned reg)
62 {
63 	__raw_writel(val, eth->base + reg);
64 }
65 
66 u32 mtk_r32(struct mtk_eth *eth, unsigned reg)
67 {
68 	return __raw_readl(eth->base + reg);
69 }
70 
71 static int mtk_mdio_busy_wait(struct mtk_eth *eth)
72 {
73 	unsigned long t_start = jiffies;
74 
75 	while (1) {
76 		if (!(mtk_r32(eth, MTK_PHY_IAC) & PHY_IAC_ACCESS))
77 			return 0;
78 		if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
79 			break;
80 		usleep_range(10, 20);
81 	}
82 
83 	dev_err(eth->dev, "mdio: MDIO timeout\n");
84 	return -1;
85 }
86 
87 static u32 _mtk_mdio_write(struct mtk_eth *eth, u32 phy_addr,
88 			   u32 phy_register, u32 write_data)
89 {
90 	if (mtk_mdio_busy_wait(eth))
91 		return -1;
92 
93 	write_data &= 0xffff;
94 
95 	mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_WRITE |
96 		(phy_register << PHY_IAC_REG_SHIFT) |
97 		(phy_addr << PHY_IAC_ADDR_SHIFT) | write_data,
98 		MTK_PHY_IAC);
99 
100 	if (mtk_mdio_busy_wait(eth))
101 		return -1;
102 
103 	return 0;
104 }
105 
106 static u32 _mtk_mdio_read(struct mtk_eth *eth, int phy_addr, int phy_reg)
107 {
108 	u32 d;
109 
110 	if (mtk_mdio_busy_wait(eth))
111 		return 0xffff;
112 
113 	mtk_w32(eth, PHY_IAC_ACCESS | PHY_IAC_START | PHY_IAC_READ |
114 		(phy_reg << PHY_IAC_REG_SHIFT) |
115 		(phy_addr << PHY_IAC_ADDR_SHIFT),
116 		MTK_PHY_IAC);
117 
118 	if (mtk_mdio_busy_wait(eth))
119 		return 0xffff;
120 
121 	d = mtk_r32(eth, MTK_PHY_IAC) & 0xffff;
122 
123 	return d;
124 }
125 
126 static int mtk_mdio_write(struct mii_bus *bus, int phy_addr,
127 			  int phy_reg, u16 val)
128 {
129 	struct mtk_eth *eth = bus->priv;
130 
131 	return _mtk_mdio_write(eth, phy_addr, phy_reg, val);
132 }
133 
134 static int mtk_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
135 {
136 	struct mtk_eth *eth = bus->priv;
137 
138 	return _mtk_mdio_read(eth, phy_addr, phy_reg);
139 }
140 
141 static void mtk_gmac0_rgmii_adjust(struct mtk_eth *eth, int speed)
142 {
143 	u32 val;
144 	int ret;
145 
146 	val = (speed == SPEED_1000) ?
147 		INTF_MODE_RGMII_1000 : INTF_MODE_RGMII_10_100;
148 	mtk_w32(eth, val, INTF_MODE);
149 
150 	regmap_update_bits(eth->ethsys, ETHSYS_CLKCFG0,
151 			   ETHSYS_TRGMII_CLK_SEL362_5,
152 			   ETHSYS_TRGMII_CLK_SEL362_5);
153 
154 	val = (speed == SPEED_1000) ? 250000000 : 500000000;
155 	ret = clk_set_rate(eth->clks[MTK_CLK_TRGPLL], val);
156 	if (ret)
157 		dev_err(eth->dev, "Failed to set trgmii pll: %d\n", ret);
158 
159 	val = (speed == SPEED_1000) ?
160 		RCK_CTRL_RGMII_1000 : RCK_CTRL_RGMII_10_100;
161 	mtk_w32(eth, val, TRGMII_RCK_CTRL);
162 
163 	val = (speed == SPEED_1000) ?
164 		TCK_CTRL_RGMII_1000 : TCK_CTRL_RGMII_10_100;
165 	mtk_w32(eth, val, TRGMII_TCK_CTRL);
166 }
167 
168 static void mtk_gmac_sgmii_hw_setup(struct mtk_eth *eth, int mac_id)
169 {
170 	u32 val;
171 
172 	/* Setup the link timer and QPHY power up inside SGMIISYS */
173 	regmap_write(eth->sgmiisys, SGMSYS_PCS_LINK_TIMER,
174 		     SGMII_LINK_TIMER_DEFAULT);
175 
176 	regmap_read(eth->sgmiisys, SGMSYS_SGMII_MODE, &val);
177 	val |= SGMII_REMOTE_FAULT_DIS;
178 	regmap_write(eth->sgmiisys, SGMSYS_SGMII_MODE, val);
179 
180 	regmap_read(eth->sgmiisys, SGMSYS_PCS_CONTROL_1, &val);
181 	val |= SGMII_AN_RESTART;
182 	regmap_write(eth->sgmiisys, SGMSYS_PCS_CONTROL_1, val);
183 
184 	regmap_read(eth->sgmiisys, SGMSYS_QPHY_PWR_STATE_CTRL, &val);
185 	val &= ~SGMII_PHYA_PWD;
186 	regmap_write(eth->sgmiisys, SGMSYS_QPHY_PWR_STATE_CTRL, val);
187 
188 	/* Determine MUX for which GMAC uses the SGMII interface */
189 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_DUAL_GMAC_SHARED_SGMII)) {
190 		regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
191 		val &= ~SYSCFG0_SGMII_MASK;
192 		val |= !mac_id ? SYSCFG0_SGMII_GMAC1 : SYSCFG0_SGMII_GMAC2;
193 		regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
194 
195 		dev_info(eth->dev, "setup shared sgmii for gmac=%d\n",
196 			 mac_id);
197 	}
198 
199 	/* Setup the GMAC1 going through SGMII path when SoC also support
200 	 * ESW on GMAC1
201 	 */
202 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_GMAC1_ESW | MTK_GMAC1_SGMII) &&
203 	    !mac_id) {
204 		mtk_w32(eth, 0, MTK_MAC_MISC);
205 		dev_info(eth->dev, "setup gmac1 going through sgmii");
206 	}
207 }
208 
209 static void mtk_phy_link_adjust(struct net_device *dev)
210 {
211 	struct mtk_mac *mac = netdev_priv(dev);
212 	u16 lcl_adv = 0, rmt_adv = 0;
213 	u8 flowctrl;
214 	u32 mcr = MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG |
215 		  MAC_MCR_FORCE_MODE | MAC_MCR_TX_EN |
216 		  MAC_MCR_RX_EN | MAC_MCR_BACKOFF_EN |
217 		  MAC_MCR_BACKPR_EN;
218 
219 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
220 		return;
221 
222 	switch (dev->phydev->speed) {
223 	case SPEED_1000:
224 		mcr |= MAC_MCR_SPEED_1000;
225 		break;
226 	case SPEED_100:
227 		mcr |= MAC_MCR_SPEED_100;
228 		break;
229 	};
230 
231 	if (MTK_HAS_CAPS(mac->hw->soc->caps, MTK_GMAC1_TRGMII) &&
232 	    !mac->id && !mac->trgmii)
233 		mtk_gmac0_rgmii_adjust(mac->hw, dev->phydev->speed);
234 
235 	if (dev->phydev->link)
236 		mcr |= MAC_MCR_FORCE_LINK;
237 
238 	if (dev->phydev->duplex) {
239 		mcr |= MAC_MCR_FORCE_DPX;
240 
241 		if (dev->phydev->pause)
242 			rmt_adv = LPA_PAUSE_CAP;
243 		if (dev->phydev->asym_pause)
244 			rmt_adv |= LPA_PAUSE_ASYM;
245 
246 		if (dev->phydev->advertising & ADVERTISED_Pause)
247 			lcl_adv |= ADVERTISE_PAUSE_CAP;
248 		if (dev->phydev->advertising & ADVERTISED_Asym_Pause)
249 			lcl_adv |= ADVERTISE_PAUSE_ASYM;
250 
251 		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
252 
253 		if (flowctrl & FLOW_CTRL_TX)
254 			mcr |= MAC_MCR_FORCE_TX_FC;
255 		if (flowctrl & FLOW_CTRL_RX)
256 			mcr |= MAC_MCR_FORCE_RX_FC;
257 
258 		netif_dbg(mac->hw, link, dev, "rx pause %s, tx pause %s\n",
259 			  flowctrl & FLOW_CTRL_RX ? "enabled" : "disabled",
260 			  flowctrl & FLOW_CTRL_TX ? "enabled" : "disabled");
261 	}
262 
263 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
264 
265 	if (dev->phydev->link)
266 		netif_carrier_on(dev);
267 	else
268 		netif_carrier_off(dev);
269 
270 	if (!of_phy_is_fixed_link(mac->of_node))
271 		phy_print_status(dev->phydev);
272 }
273 
274 static int mtk_phy_connect_node(struct mtk_eth *eth, struct mtk_mac *mac,
275 				struct device_node *phy_node)
276 {
277 	struct phy_device *phydev;
278 	int phy_mode;
279 
280 	phy_mode = of_get_phy_mode(phy_node);
281 	if (phy_mode < 0) {
282 		dev_err(eth->dev, "incorrect phy-mode %d\n", phy_mode);
283 		return -EINVAL;
284 	}
285 
286 	phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
287 				mtk_phy_link_adjust, 0, phy_mode);
288 	if (!phydev) {
289 		dev_err(eth->dev, "could not connect to PHY\n");
290 		return -ENODEV;
291 	}
292 
293 	dev_info(eth->dev,
294 		 "connected mac %d to PHY at %s [uid=%08x, driver=%s]\n",
295 		 mac->id, phydev_name(phydev), phydev->phy_id,
296 		 phydev->drv->name);
297 
298 	return 0;
299 }
300 
301 static int mtk_phy_connect(struct net_device *dev)
302 {
303 	struct mtk_mac *mac = netdev_priv(dev);
304 	struct mtk_eth *eth;
305 	struct device_node *np;
306 	u32 val;
307 
308 	eth = mac->hw;
309 	np = of_parse_phandle(mac->of_node, "phy-handle", 0);
310 	if (!np && of_phy_is_fixed_link(mac->of_node))
311 		if (!of_phy_register_fixed_link(mac->of_node))
312 			np = of_node_get(mac->of_node);
313 	if (!np)
314 		return -ENODEV;
315 
316 	mac->ge_mode = 0;
317 	switch (of_get_phy_mode(np)) {
318 	case PHY_INTERFACE_MODE_TRGMII:
319 		mac->trgmii = true;
320 	case PHY_INTERFACE_MODE_RGMII_TXID:
321 	case PHY_INTERFACE_MODE_RGMII_RXID:
322 	case PHY_INTERFACE_MODE_RGMII_ID:
323 	case PHY_INTERFACE_MODE_RGMII:
324 		break;
325 	case PHY_INTERFACE_MODE_SGMII:
326 		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SGMII))
327 			mtk_gmac_sgmii_hw_setup(eth, mac->id);
328 		break;
329 	case PHY_INTERFACE_MODE_MII:
330 		mac->ge_mode = 1;
331 		break;
332 	case PHY_INTERFACE_MODE_REVMII:
333 		mac->ge_mode = 2;
334 		break;
335 	case PHY_INTERFACE_MODE_RMII:
336 		if (!mac->id)
337 			goto err_phy;
338 		mac->ge_mode = 3;
339 		break;
340 	default:
341 		goto err_phy;
342 	}
343 
344 	/* put the gmac into the right mode */
345 	regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
346 	val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, mac->id);
347 	val |= SYSCFG0_GE_MODE(mac->ge_mode, mac->id);
348 	regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
349 
350 	/* couple phydev to net_device */
351 	if (mtk_phy_connect_node(eth, mac, np))
352 		goto err_phy;
353 
354 	dev->phydev->autoneg = AUTONEG_ENABLE;
355 	dev->phydev->speed = 0;
356 	dev->phydev->duplex = 0;
357 
358 	if (of_phy_is_fixed_link(mac->of_node))
359 		dev->phydev->supported |=
360 		SUPPORTED_Pause | SUPPORTED_Asym_Pause;
361 
362 	dev->phydev->supported &= PHY_GBIT_FEATURES | SUPPORTED_Pause |
363 				   SUPPORTED_Asym_Pause;
364 	dev->phydev->advertising = dev->phydev->supported |
365 				    ADVERTISED_Autoneg;
366 	phy_start_aneg(dev->phydev);
367 
368 	of_node_put(np);
369 
370 	return 0;
371 
372 err_phy:
373 	if (of_phy_is_fixed_link(mac->of_node))
374 		of_phy_deregister_fixed_link(mac->of_node);
375 	of_node_put(np);
376 	dev_err(eth->dev, "%s: invalid phy\n", __func__);
377 	return -EINVAL;
378 }
379 
380 static int mtk_mdio_init(struct mtk_eth *eth)
381 {
382 	struct device_node *mii_np;
383 	int ret;
384 
385 	mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
386 	if (!mii_np) {
387 		dev_err(eth->dev, "no %s child node found", "mdio-bus");
388 		return -ENODEV;
389 	}
390 
391 	if (!of_device_is_available(mii_np)) {
392 		ret = -ENODEV;
393 		goto err_put_node;
394 	}
395 
396 	eth->mii_bus = devm_mdiobus_alloc(eth->dev);
397 	if (!eth->mii_bus) {
398 		ret = -ENOMEM;
399 		goto err_put_node;
400 	}
401 
402 	eth->mii_bus->name = "mdio";
403 	eth->mii_bus->read = mtk_mdio_read;
404 	eth->mii_bus->write = mtk_mdio_write;
405 	eth->mii_bus->priv = eth;
406 	eth->mii_bus->parent = eth->dev;
407 
408 	snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
409 	ret = of_mdiobus_register(eth->mii_bus, mii_np);
410 
411 err_put_node:
412 	of_node_put(mii_np);
413 	return ret;
414 }
415 
416 static void mtk_mdio_cleanup(struct mtk_eth *eth)
417 {
418 	if (!eth->mii_bus)
419 		return;
420 
421 	mdiobus_unregister(eth->mii_bus);
422 }
423 
424 static inline void mtk_tx_irq_disable(struct mtk_eth *eth, u32 mask)
425 {
426 	unsigned long flags;
427 	u32 val;
428 
429 	spin_lock_irqsave(&eth->tx_irq_lock, flags);
430 	val = mtk_r32(eth, MTK_QDMA_INT_MASK);
431 	mtk_w32(eth, val & ~mask, MTK_QDMA_INT_MASK);
432 	spin_unlock_irqrestore(&eth->tx_irq_lock, flags);
433 }
434 
435 static inline void mtk_tx_irq_enable(struct mtk_eth *eth, u32 mask)
436 {
437 	unsigned long flags;
438 	u32 val;
439 
440 	spin_lock_irqsave(&eth->tx_irq_lock, flags);
441 	val = mtk_r32(eth, MTK_QDMA_INT_MASK);
442 	mtk_w32(eth, val | mask, MTK_QDMA_INT_MASK);
443 	spin_unlock_irqrestore(&eth->tx_irq_lock, flags);
444 }
445 
446 static inline void mtk_rx_irq_disable(struct mtk_eth *eth, u32 mask)
447 {
448 	unsigned long flags;
449 	u32 val;
450 
451 	spin_lock_irqsave(&eth->rx_irq_lock, flags);
452 	val = mtk_r32(eth, MTK_PDMA_INT_MASK);
453 	mtk_w32(eth, val & ~mask, MTK_PDMA_INT_MASK);
454 	spin_unlock_irqrestore(&eth->rx_irq_lock, flags);
455 }
456 
457 static inline void mtk_rx_irq_enable(struct mtk_eth *eth, u32 mask)
458 {
459 	unsigned long flags;
460 	u32 val;
461 
462 	spin_lock_irqsave(&eth->rx_irq_lock, flags);
463 	val = mtk_r32(eth, MTK_PDMA_INT_MASK);
464 	mtk_w32(eth, val | mask, MTK_PDMA_INT_MASK);
465 	spin_unlock_irqrestore(&eth->rx_irq_lock, flags);
466 }
467 
468 static int mtk_set_mac_address(struct net_device *dev, void *p)
469 {
470 	int ret = eth_mac_addr(dev, p);
471 	struct mtk_mac *mac = netdev_priv(dev);
472 	const char *macaddr = dev->dev_addr;
473 
474 	if (ret)
475 		return ret;
476 
477 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
478 		return -EBUSY;
479 
480 	spin_lock_bh(&mac->hw->page_lock);
481 	mtk_w32(mac->hw, (macaddr[0] << 8) | macaddr[1],
482 		MTK_GDMA_MAC_ADRH(mac->id));
483 	mtk_w32(mac->hw, (macaddr[2] << 24) | (macaddr[3] << 16) |
484 		(macaddr[4] << 8) | macaddr[5],
485 		MTK_GDMA_MAC_ADRL(mac->id));
486 	spin_unlock_bh(&mac->hw->page_lock);
487 
488 	return 0;
489 }
490 
491 void mtk_stats_update_mac(struct mtk_mac *mac)
492 {
493 	struct mtk_hw_stats *hw_stats = mac->hw_stats;
494 	unsigned int base = MTK_GDM1_TX_GBCNT;
495 	u64 stats;
496 
497 	base += hw_stats->reg_offset;
498 
499 	u64_stats_update_begin(&hw_stats->syncp);
500 
501 	hw_stats->rx_bytes += mtk_r32(mac->hw, base);
502 	stats =  mtk_r32(mac->hw, base + 0x04);
503 	if (stats)
504 		hw_stats->rx_bytes += (stats << 32);
505 	hw_stats->rx_packets += mtk_r32(mac->hw, base + 0x08);
506 	hw_stats->rx_overflow += mtk_r32(mac->hw, base + 0x10);
507 	hw_stats->rx_fcs_errors += mtk_r32(mac->hw, base + 0x14);
508 	hw_stats->rx_short_errors += mtk_r32(mac->hw, base + 0x18);
509 	hw_stats->rx_long_errors += mtk_r32(mac->hw, base + 0x1c);
510 	hw_stats->rx_checksum_errors += mtk_r32(mac->hw, base + 0x20);
511 	hw_stats->rx_flow_control_packets +=
512 					mtk_r32(mac->hw, base + 0x24);
513 	hw_stats->tx_skip += mtk_r32(mac->hw, base + 0x28);
514 	hw_stats->tx_collisions += mtk_r32(mac->hw, base + 0x2c);
515 	hw_stats->tx_bytes += mtk_r32(mac->hw, base + 0x30);
516 	stats =  mtk_r32(mac->hw, base + 0x34);
517 	if (stats)
518 		hw_stats->tx_bytes += (stats << 32);
519 	hw_stats->tx_packets += mtk_r32(mac->hw, base + 0x38);
520 	u64_stats_update_end(&hw_stats->syncp);
521 }
522 
523 static void mtk_stats_update(struct mtk_eth *eth)
524 {
525 	int i;
526 
527 	for (i = 0; i < MTK_MAC_COUNT; i++) {
528 		if (!eth->mac[i] || !eth->mac[i]->hw_stats)
529 			continue;
530 		if (spin_trylock(&eth->mac[i]->hw_stats->stats_lock)) {
531 			mtk_stats_update_mac(eth->mac[i]);
532 			spin_unlock(&eth->mac[i]->hw_stats->stats_lock);
533 		}
534 	}
535 }
536 
537 static void mtk_get_stats64(struct net_device *dev,
538 			    struct rtnl_link_stats64 *storage)
539 {
540 	struct mtk_mac *mac = netdev_priv(dev);
541 	struct mtk_hw_stats *hw_stats = mac->hw_stats;
542 	unsigned int start;
543 
544 	if (netif_running(dev) && netif_device_present(dev)) {
545 		if (spin_trylock_bh(&hw_stats->stats_lock)) {
546 			mtk_stats_update_mac(mac);
547 			spin_unlock_bh(&hw_stats->stats_lock);
548 		}
549 	}
550 
551 	do {
552 		start = u64_stats_fetch_begin_irq(&hw_stats->syncp);
553 		storage->rx_packets = hw_stats->rx_packets;
554 		storage->tx_packets = hw_stats->tx_packets;
555 		storage->rx_bytes = hw_stats->rx_bytes;
556 		storage->tx_bytes = hw_stats->tx_bytes;
557 		storage->collisions = hw_stats->tx_collisions;
558 		storage->rx_length_errors = hw_stats->rx_short_errors +
559 			hw_stats->rx_long_errors;
560 		storage->rx_over_errors = hw_stats->rx_overflow;
561 		storage->rx_crc_errors = hw_stats->rx_fcs_errors;
562 		storage->rx_errors = hw_stats->rx_checksum_errors;
563 		storage->tx_aborted_errors = hw_stats->tx_skip;
564 	} while (u64_stats_fetch_retry_irq(&hw_stats->syncp, start));
565 
566 	storage->tx_errors = dev->stats.tx_errors;
567 	storage->rx_dropped = dev->stats.rx_dropped;
568 	storage->tx_dropped = dev->stats.tx_dropped;
569 }
570 
571 static inline int mtk_max_frag_size(int mtu)
572 {
573 	/* make sure buf_size will be at least MTK_MAX_RX_LENGTH */
574 	if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH)
575 		mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
576 
577 	return SKB_DATA_ALIGN(MTK_RX_HLEN + mtu) +
578 		SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
579 }
580 
581 static inline int mtk_max_buf_size(int frag_size)
582 {
583 	int buf_size = frag_size - NET_SKB_PAD - NET_IP_ALIGN -
584 		       SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
585 
586 	WARN_ON(buf_size < MTK_MAX_RX_LENGTH);
587 
588 	return buf_size;
589 }
590 
591 static inline void mtk_rx_get_desc(struct mtk_rx_dma *rxd,
592 				   struct mtk_rx_dma *dma_rxd)
593 {
594 	rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
595 	rxd->rxd2 = READ_ONCE(dma_rxd->rxd2);
596 	rxd->rxd3 = READ_ONCE(dma_rxd->rxd3);
597 	rxd->rxd4 = READ_ONCE(dma_rxd->rxd4);
598 }
599 
600 /* the qdma core needs scratch memory to be setup */
601 static int mtk_init_fq_dma(struct mtk_eth *eth)
602 {
603 	dma_addr_t phy_ring_tail;
604 	int cnt = MTK_DMA_SIZE;
605 	dma_addr_t dma_addr;
606 	int i;
607 
608 	eth->scratch_ring = dma_alloc_coherent(eth->dev,
609 					       cnt * sizeof(struct mtk_tx_dma),
610 					       &eth->phy_scratch_ring,
611 					       GFP_ATOMIC | __GFP_ZERO);
612 	if (unlikely(!eth->scratch_ring))
613 		return -ENOMEM;
614 
615 	eth->scratch_head = kcalloc(cnt, MTK_QDMA_PAGE_SIZE,
616 				    GFP_KERNEL);
617 	if (unlikely(!eth->scratch_head))
618 		return -ENOMEM;
619 
620 	dma_addr = dma_map_single(eth->dev,
621 				  eth->scratch_head, cnt * MTK_QDMA_PAGE_SIZE,
622 				  DMA_FROM_DEVICE);
623 	if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
624 		return -ENOMEM;
625 
626 	memset(eth->scratch_ring, 0x0, sizeof(struct mtk_tx_dma) * cnt);
627 	phy_ring_tail = eth->phy_scratch_ring +
628 			(sizeof(struct mtk_tx_dma) * (cnt - 1));
629 
630 	for (i = 0; i < cnt; i++) {
631 		eth->scratch_ring[i].txd1 =
632 					(dma_addr + (i * MTK_QDMA_PAGE_SIZE));
633 		if (i < cnt - 1)
634 			eth->scratch_ring[i].txd2 = (eth->phy_scratch_ring +
635 				((i + 1) * sizeof(struct mtk_tx_dma)));
636 		eth->scratch_ring[i].txd3 = TX_DMA_SDL(MTK_QDMA_PAGE_SIZE);
637 	}
638 
639 	mtk_w32(eth, eth->phy_scratch_ring, MTK_QDMA_FQ_HEAD);
640 	mtk_w32(eth, phy_ring_tail, MTK_QDMA_FQ_TAIL);
641 	mtk_w32(eth, (cnt << 16) | cnt, MTK_QDMA_FQ_CNT);
642 	mtk_w32(eth, MTK_QDMA_PAGE_SIZE << 16, MTK_QDMA_FQ_BLEN);
643 
644 	return 0;
645 }
646 
647 static inline void *mtk_qdma_phys_to_virt(struct mtk_tx_ring *ring, u32 desc)
648 {
649 	void *ret = ring->dma;
650 
651 	return ret + (desc - ring->phys);
652 }
653 
654 static inline struct mtk_tx_buf *mtk_desc_to_tx_buf(struct mtk_tx_ring *ring,
655 						    struct mtk_tx_dma *txd)
656 {
657 	int idx = txd - ring->dma;
658 
659 	return &ring->buf[idx];
660 }
661 
662 static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
663 {
664 	if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
665 		dma_unmap_single(eth->dev,
666 				 dma_unmap_addr(tx_buf, dma_addr0),
667 				 dma_unmap_len(tx_buf, dma_len0),
668 				 DMA_TO_DEVICE);
669 	} else if (tx_buf->flags & MTK_TX_FLAGS_PAGE0) {
670 		dma_unmap_page(eth->dev,
671 			       dma_unmap_addr(tx_buf, dma_addr0),
672 			       dma_unmap_len(tx_buf, dma_len0),
673 			       DMA_TO_DEVICE);
674 	}
675 	tx_buf->flags = 0;
676 	if (tx_buf->skb &&
677 	    (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
678 		dev_kfree_skb_any(tx_buf->skb);
679 	tx_buf->skb = NULL;
680 }
681 
682 static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
683 		      int tx_num, struct mtk_tx_ring *ring, bool gso)
684 {
685 	struct mtk_mac *mac = netdev_priv(dev);
686 	struct mtk_eth *eth = mac->hw;
687 	struct mtk_tx_dma *itxd, *txd;
688 	struct mtk_tx_buf *itx_buf, *tx_buf;
689 	dma_addr_t mapped_addr;
690 	unsigned int nr_frags;
691 	int i, n_desc = 1;
692 	u32 txd4 = 0, fport;
693 
694 	itxd = ring->next_free;
695 	if (itxd == ring->last_free)
696 		return -ENOMEM;
697 
698 	/* set the forward port */
699 	fport = (mac->id + 1) << TX_DMA_FPORT_SHIFT;
700 	txd4 |= fport;
701 
702 	itx_buf = mtk_desc_to_tx_buf(ring, itxd);
703 	memset(itx_buf, 0, sizeof(*itx_buf));
704 
705 	if (gso)
706 		txd4 |= TX_DMA_TSO;
707 
708 	/* TX Checksum offload */
709 	if (skb->ip_summed == CHECKSUM_PARTIAL)
710 		txd4 |= TX_DMA_CHKSUM;
711 
712 	/* VLAN header offload */
713 	if (skb_vlan_tag_present(skb))
714 		txd4 |= TX_DMA_INS_VLAN | skb_vlan_tag_get(skb);
715 
716 	mapped_addr = dma_map_single(eth->dev, skb->data,
717 				     skb_headlen(skb), DMA_TO_DEVICE);
718 	if (unlikely(dma_mapping_error(eth->dev, mapped_addr)))
719 		return -ENOMEM;
720 
721 	WRITE_ONCE(itxd->txd1, mapped_addr);
722 	itx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
723 	itx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
724 			  MTK_TX_FLAGS_FPORT1;
725 	dma_unmap_addr_set(itx_buf, dma_addr0, mapped_addr);
726 	dma_unmap_len_set(itx_buf, dma_len0, skb_headlen(skb));
727 
728 	/* TX SG offload */
729 	txd = itxd;
730 	nr_frags = skb_shinfo(skb)->nr_frags;
731 	for (i = 0; i < nr_frags; i++) {
732 		struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
733 		unsigned int offset = 0;
734 		int frag_size = skb_frag_size(frag);
735 
736 		while (frag_size) {
737 			bool last_frag = false;
738 			unsigned int frag_map_size;
739 
740 			txd = mtk_qdma_phys_to_virt(ring, txd->txd2);
741 			if (txd == ring->last_free)
742 				goto err_dma;
743 
744 			n_desc++;
745 			frag_map_size = min(frag_size, MTK_TX_DMA_BUF_LEN);
746 			mapped_addr = skb_frag_dma_map(eth->dev, frag, offset,
747 						       frag_map_size,
748 						       DMA_TO_DEVICE);
749 			if (unlikely(dma_mapping_error(eth->dev, mapped_addr)))
750 				goto err_dma;
751 
752 			if (i == nr_frags - 1 &&
753 			    (frag_size - frag_map_size) == 0)
754 				last_frag = true;
755 
756 			WRITE_ONCE(txd->txd1, mapped_addr);
757 			WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
758 					       TX_DMA_PLEN0(frag_map_size) |
759 					       last_frag * TX_DMA_LS0));
760 			WRITE_ONCE(txd->txd4, fport);
761 
762 			tx_buf = mtk_desc_to_tx_buf(ring, txd);
763 			memset(tx_buf, 0, sizeof(*tx_buf));
764 			tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
765 			tx_buf->flags |= MTK_TX_FLAGS_PAGE0;
766 			tx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
767 					 MTK_TX_FLAGS_FPORT1;
768 
769 			dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
770 			dma_unmap_len_set(tx_buf, dma_len0, frag_map_size);
771 			frag_size -= frag_map_size;
772 			offset += frag_map_size;
773 		}
774 	}
775 
776 	/* store skb to cleanup */
777 	itx_buf->skb = skb;
778 
779 	WRITE_ONCE(itxd->txd4, txd4);
780 	WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
781 				(!nr_frags * TX_DMA_LS0)));
782 
783 	netdev_sent_queue(dev, skb->len);
784 	skb_tx_timestamp(skb);
785 
786 	ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
787 	atomic_sub(n_desc, &ring->free_count);
788 
789 	/* make sure that all changes to the dma ring are flushed before we
790 	 * continue
791 	 */
792 	wmb();
793 
794 	if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)) || !skb->xmit_more)
795 		mtk_w32(eth, txd->txd2, MTK_QTX_CTX_PTR);
796 
797 	return 0;
798 
799 err_dma:
800 	do {
801 		tx_buf = mtk_desc_to_tx_buf(ring, itxd);
802 
803 		/* unmap dma */
804 		mtk_tx_unmap(eth, tx_buf);
805 
806 		itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
807 		itxd = mtk_qdma_phys_to_virt(ring, itxd->txd2);
808 	} while (itxd != txd);
809 
810 	return -ENOMEM;
811 }
812 
813 static inline int mtk_cal_txd_req(struct sk_buff *skb)
814 {
815 	int i, nfrags;
816 	struct skb_frag_struct *frag;
817 
818 	nfrags = 1;
819 	if (skb_is_gso(skb)) {
820 		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
821 			frag = &skb_shinfo(skb)->frags[i];
822 			nfrags += DIV_ROUND_UP(frag->size, MTK_TX_DMA_BUF_LEN);
823 		}
824 	} else {
825 		nfrags += skb_shinfo(skb)->nr_frags;
826 	}
827 
828 	return nfrags;
829 }
830 
831 static int mtk_queue_stopped(struct mtk_eth *eth)
832 {
833 	int i;
834 
835 	for (i = 0; i < MTK_MAC_COUNT; i++) {
836 		if (!eth->netdev[i])
837 			continue;
838 		if (netif_queue_stopped(eth->netdev[i]))
839 			return 1;
840 	}
841 
842 	return 0;
843 }
844 
845 static void mtk_wake_queue(struct mtk_eth *eth)
846 {
847 	int i;
848 
849 	for (i = 0; i < MTK_MAC_COUNT; i++) {
850 		if (!eth->netdev[i])
851 			continue;
852 		netif_wake_queue(eth->netdev[i]);
853 	}
854 }
855 
856 static void mtk_stop_queue(struct mtk_eth *eth)
857 {
858 	int i;
859 
860 	for (i = 0; i < MTK_MAC_COUNT; i++) {
861 		if (!eth->netdev[i])
862 			continue;
863 		netif_stop_queue(eth->netdev[i]);
864 	}
865 }
866 
867 static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
868 {
869 	struct mtk_mac *mac = netdev_priv(dev);
870 	struct mtk_eth *eth = mac->hw;
871 	struct mtk_tx_ring *ring = &eth->tx_ring;
872 	struct net_device_stats *stats = &dev->stats;
873 	bool gso = false;
874 	int tx_num;
875 
876 	/* normally we can rely on the stack not calling this more than once,
877 	 * however we have 2 queues running on the same ring so we need to lock
878 	 * the ring access
879 	 */
880 	spin_lock(&eth->page_lock);
881 
882 	if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
883 		goto drop;
884 
885 	tx_num = mtk_cal_txd_req(skb);
886 	if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
887 		mtk_stop_queue(eth);
888 		netif_err(eth, tx_queued, dev,
889 			  "Tx Ring full when queue awake!\n");
890 		spin_unlock(&eth->page_lock);
891 		return NETDEV_TX_BUSY;
892 	}
893 
894 	/* TSO: fill MSS info in tcp checksum field */
895 	if (skb_is_gso(skb)) {
896 		if (skb_cow_head(skb, 0)) {
897 			netif_warn(eth, tx_err, dev,
898 				   "GSO expand head fail.\n");
899 			goto drop;
900 		}
901 
902 		if (skb_shinfo(skb)->gso_type &
903 				(SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
904 			gso = true;
905 			tcp_hdr(skb)->check = htons(skb_shinfo(skb)->gso_size);
906 		}
907 	}
908 
909 	if (mtk_tx_map(skb, dev, tx_num, ring, gso) < 0)
910 		goto drop;
911 
912 	if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
913 		mtk_stop_queue(eth);
914 
915 	spin_unlock(&eth->page_lock);
916 
917 	return NETDEV_TX_OK;
918 
919 drop:
920 	spin_unlock(&eth->page_lock);
921 	stats->tx_dropped++;
922 	dev_kfree_skb_any(skb);
923 	return NETDEV_TX_OK;
924 }
925 
926 static struct mtk_rx_ring *mtk_get_rx_ring(struct mtk_eth *eth)
927 {
928 	int i;
929 	struct mtk_rx_ring *ring;
930 	int idx;
931 
932 	if (!eth->hwlro)
933 		return &eth->rx_ring[0];
934 
935 	for (i = 0; i < MTK_MAX_RX_RING_NUM; i++) {
936 		ring = &eth->rx_ring[i];
937 		idx = NEXT_RX_DESP_IDX(ring->calc_idx, ring->dma_size);
938 		if (ring->dma[idx].rxd2 & RX_DMA_DONE) {
939 			ring->calc_idx_update = true;
940 			return ring;
941 		}
942 	}
943 
944 	return NULL;
945 }
946 
947 static void mtk_update_rx_cpu_idx(struct mtk_eth *eth)
948 {
949 	struct mtk_rx_ring *ring;
950 	int i;
951 
952 	if (!eth->hwlro) {
953 		ring = &eth->rx_ring[0];
954 		mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
955 	} else {
956 		for (i = 0; i < MTK_MAX_RX_RING_NUM; i++) {
957 			ring = &eth->rx_ring[i];
958 			if (ring->calc_idx_update) {
959 				ring->calc_idx_update = false;
960 				mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
961 			}
962 		}
963 	}
964 }
965 
966 static int mtk_poll_rx(struct napi_struct *napi, int budget,
967 		       struct mtk_eth *eth)
968 {
969 	struct mtk_rx_ring *ring;
970 	int idx;
971 	struct sk_buff *skb;
972 	u8 *data, *new_data;
973 	struct mtk_rx_dma *rxd, trxd;
974 	int done = 0;
975 
976 	while (done < budget) {
977 		struct net_device *netdev;
978 		unsigned int pktlen;
979 		dma_addr_t dma_addr;
980 		int mac = 0;
981 
982 		ring = mtk_get_rx_ring(eth);
983 		if (unlikely(!ring))
984 			goto rx_done;
985 
986 		idx = NEXT_RX_DESP_IDX(ring->calc_idx, ring->dma_size);
987 		rxd = &ring->dma[idx];
988 		data = ring->data[idx];
989 
990 		mtk_rx_get_desc(&trxd, rxd);
991 		if (!(trxd.rxd2 & RX_DMA_DONE))
992 			break;
993 
994 		/* find out which mac the packet come from. values start at 1 */
995 		mac = (trxd.rxd4 >> RX_DMA_FPORT_SHIFT) &
996 		      RX_DMA_FPORT_MASK;
997 		mac--;
998 
999 		if (unlikely(mac < 0 || mac >= MTK_MAC_COUNT ||
1000 			     !eth->netdev[mac]))
1001 			goto release_desc;
1002 
1003 		netdev = eth->netdev[mac];
1004 
1005 		if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
1006 			goto release_desc;
1007 
1008 		/* alloc new buffer */
1009 		new_data = napi_alloc_frag(ring->frag_size);
1010 		if (unlikely(!new_data)) {
1011 			netdev->stats.rx_dropped++;
1012 			goto release_desc;
1013 		}
1014 		dma_addr = dma_map_single(eth->dev,
1015 					  new_data + NET_SKB_PAD,
1016 					  ring->buf_size,
1017 					  DMA_FROM_DEVICE);
1018 		if (unlikely(dma_mapping_error(eth->dev, dma_addr))) {
1019 			skb_free_frag(new_data);
1020 			netdev->stats.rx_dropped++;
1021 			goto release_desc;
1022 		}
1023 
1024 		/* receive data */
1025 		skb = build_skb(data, ring->frag_size);
1026 		if (unlikely(!skb)) {
1027 			skb_free_frag(new_data);
1028 			netdev->stats.rx_dropped++;
1029 			goto release_desc;
1030 		}
1031 		skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1032 
1033 		dma_unmap_single(eth->dev, trxd.rxd1,
1034 				 ring->buf_size, DMA_FROM_DEVICE);
1035 		pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
1036 		skb->dev = netdev;
1037 		skb_put(skb, pktlen);
1038 		if (trxd.rxd4 & RX_DMA_L4_VALID)
1039 			skb->ip_summed = CHECKSUM_UNNECESSARY;
1040 		else
1041 			skb_checksum_none_assert(skb);
1042 		skb->protocol = eth_type_trans(skb, netdev);
1043 
1044 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
1045 		    RX_DMA_VID(trxd.rxd3))
1046 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1047 					       RX_DMA_VID(trxd.rxd3));
1048 		skb_record_rx_queue(skb, 0);
1049 		napi_gro_receive(napi, skb);
1050 
1051 		ring->data[idx] = new_data;
1052 		rxd->rxd1 = (unsigned int)dma_addr;
1053 
1054 release_desc:
1055 		rxd->rxd2 = RX_DMA_PLEN0(ring->buf_size);
1056 
1057 		ring->calc_idx = idx;
1058 
1059 		done++;
1060 	}
1061 
1062 rx_done:
1063 	if (done) {
1064 		/* make sure that all changes to the dma ring are flushed before
1065 		 * we continue
1066 		 */
1067 		wmb();
1068 		mtk_update_rx_cpu_idx(eth);
1069 	}
1070 
1071 	return done;
1072 }
1073 
1074 static int mtk_poll_tx(struct mtk_eth *eth, int budget)
1075 {
1076 	struct mtk_tx_ring *ring = &eth->tx_ring;
1077 	struct mtk_tx_dma *desc;
1078 	struct sk_buff *skb;
1079 	struct mtk_tx_buf *tx_buf;
1080 	unsigned int done[MTK_MAX_DEVS];
1081 	unsigned int bytes[MTK_MAX_DEVS];
1082 	u32 cpu, dma;
1083 	int total = 0, i;
1084 
1085 	memset(done, 0, sizeof(done));
1086 	memset(bytes, 0, sizeof(bytes));
1087 
1088 	cpu = mtk_r32(eth, MTK_QTX_CRX_PTR);
1089 	dma = mtk_r32(eth, MTK_QTX_DRX_PTR);
1090 
1091 	desc = mtk_qdma_phys_to_virt(ring, cpu);
1092 
1093 	while ((cpu != dma) && budget) {
1094 		u32 next_cpu = desc->txd2;
1095 		int mac = 0;
1096 
1097 		desc = mtk_qdma_phys_to_virt(ring, desc->txd2);
1098 		if ((desc->txd3 & TX_DMA_OWNER_CPU) == 0)
1099 			break;
1100 
1101 		tx_buf = mtk_desc_to_tx_buf(ring, desc);
1102 		if (tx_buf->flags & MTK_TX_FLAGS_FPORT1)
1103 			mac = 1;
1104 
1105 		skb = tx_buf->skb;
1106 		if (!skb)
1107 			break;
1108 
1109 		if (skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC) {
1110 			bytes[mac] += skb->len;
1111 			done[mac]++;
1112 			budget--;
1113 		}
1114 		mtk_tx_unmap(eth, tx_buf);
1115 
1116 		ring->last_free = desc;
1117 		atomic_inc(&ring->free_count);
1118 
1119 		cpu = next_cpu;
1120 	}
1121 
1122 	mtk_w32(eth, cpu, MTK_QTX_CRX_PTR);
1123 
1124 	for (i = 0; i < MTK_MAC_COUNT; i++) {
1125 		if (!eth->netdev[i] || !done[i])
1126 			continue;
1127 		netdev_completed_queue(eth->netdev[i], done[i], bytes[i]);
1128 		total += done[i];
1129 	}
1130 
1131 	if (mtk_queue_stopped(eth) &&
1132 	    (atomic_read(&ring->free_count) > ring->thresh))
1133 		mtk_wake_queue(eth);
1134 
1135 	return total;
1136 }
1137 
1138 static void mtk_handle_status_irq(struct mtk_eth *eth)
1139 {
1140 	u32 status2 = mtk_r32(eth, MTK_INT_STATUS2);
1141 
1142 	if (unlikely(status2 & (MTK_GDM1_AF | MTK_GDM2_AF))) {
1143 		mtk_stats_update(eth);
1144 		mtk_w32(eth, (MTK_GDM1_AF | MTK_GDM2_AF),
1145 			MTK_INT_STATUS2);
1146 	}
1147 }
1148 
1149 static int mtk_napi_tx(struct napi_struct *napi, int budget)
1150 {
1151 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, tx_napi);
1152 	u32 status, mask;
1153 	int tx_done = 0;
1154 
1155 	mtk_handle_status_irq(eth);
1156 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_QMTK_INT_STATUS);
1157 	tx_done = mtk_poll_tx(eth, budget);
1158 
1159 	if (unlikely(netif_msg_intr(eth))) {
1160 		status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
1161 		mask = mtk_r32(eth, MTK_QDMA_INT_MASK);
1162 		dev_info(eth->dev,
1163 			 "done tx %d, intr 0x%08x/0x%x\n",
1164 			 tx_done, status, mask);
1165 	}
1166 
1167 	if (tx_done == budget)
1168 		return budget;
1169 
1170 	status = mtk_r32(eth, MTK_QMTK_INT_STATUS);
1171 	if (status & MTK_TX_DONE_INT)
1172 		return budget;
1173 
1174 	napi_complete(napi);
1175 	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1176 
1177 	return tx_done;
1178 }
1179 
1180 static int mtk_napi_rx(struct napi_struct *napi, int budget)
1181 {
1182 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, rx_napi);
1183 	u32 status, mask;
1184 	int rx_done = 0;
1185 	int remain_budget = budget;
1186 
1187 	mtk_handle_status_irq(eth);
1188 
1189 poll_again:
1190 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
1191 	rx_done = mtk_poll_rx(napi, remain_budget, eth);
1192 
1193 	if (unlikely(netif_msg_intr(eth))) {
1194 		status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
1195 		mask = mtk_r32(eth, MTK_PDMA_INT_MASK);
1196 		dev_info(eth->dev,
1197 			 "done rx %d, intr 0x%08x/0x%x\n",
1198 			 rx_done, status, mask);
1199 	}
1200 	if (rx_done == remain_budget)
1201 		return budget;
1202 
1203 	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
1204 	if (status & MTK_RX_DONE_INT) {
1205 		remain_budget -= rx_done;
1206 		goto poll_again;
1207 	}
1208 	napi_complete(napi);
1209 	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1210 
1211 	return rx_done + budget - remain_budget;
1212 }
1213 
1214 static int mtk_tx_alloc(struct mtk_eth *eth)
1215 {
1216 	struct mtk_tx_ring *ring = &eth->tx_ring;
1217 	int i, sz = sizeof(*ring->dma);
1218 
1219 	ring->buf = kcalloc(MTK_DMA_SIZE, sizeof(*ring->buf),
1220 			       GFP_KERNEL);
1221 	if (!ring->buf)
1222 		goto no_tx_mem;
1223 
1224 	ring->dma = dma_zalloc_coherent(eth->dev, MTK_DMA_SIZE * sz,
1225 					&ring->phys, GFP_ATOMIC);
1226 	if (!ring->dma)
1227 		goto no_tx_mem;
1228 
1229 	for (i = 0; i < MTK_DMA_SIZE; i++) {
1230 		int next = (i + 1) % MTK_DMA_SIZE;
1231 		u32 next_ptr = ring->phys + next * sz;
1232 
1233 		ring->dma[i].txd2 = next_ptr;
1234 		ring->dma[i].txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
1235 	}
1236 
1237 	atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
1238 	ring->next_free = &ring->dma[0];
1239 	ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
1240 	ring->thresh = MAX_SKB_FRAGS;
1241 
1242 	/* make sure that all changes to the dma ring are flushed before we
1243 	 * continue
1244 	 */
1245 	wmb();
1246 
1247 	mtk_w32(eth, ring->phys, MTK_QTX_CTX_PTR);
1248 	mtk_w32(eth, ring->phys, MTK_QTX_DTX_PTR);
1249 	mtk_w32(eth,
1250 		ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1251 		MTK_QTX_CRX_PTR);
1252 	mtk_w32(eth,
1253 		ring->phys + ((MTK_DMA_SIZE - 1) * sz),
1254 		MTK_QTX_DRX_PTR);
1255 	mtk_w32(eth, (QDMA_RES_THRES << 8) | QDMA_RES_THRES, MTK_QTX_CFG(0));
1256 
1257 	return 0;
1258 
1259 no_tx_mem:
1260 	return -ENOMEM;
1261 }
1262 
1263 static void mtk_tx_clean(struct mtk_eth *eth)
1264 {
1265 	struct mtk_tx_ring *ring = &eth->tx_ring;
1266 	int i;
1267 
1268 	if (ring->buf) {
1269 		for (i = 0; i < MTK_DMA_SIZE; i++)
1270 			mtk_tx_unmap(eth, &ring->buf[i]);
1271 		kfree(ring->buf);
1272 		ring->buf = NULL;
1273 	}
1274 
1275 	if (ring->dma) {
1276 		dma_free_coherent(eth->dev,
1277 				  MTK_DMA_SIZE * sizeof(*ring->dma),
1278 				  ring->dma,
1279 				  ring->phys);
1280 		ring->dma = NULL;
1281 	}
1282 }
1283 
1284 static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
1285 {
1286 	struct mtk_rx_ring *ring;
1287 	int rx_data_len, rx_dma_size;
1288 	int i;
1289 	u32 offset = 0;
1290 
1291 	if (rx_flag == MTK_RX_FLAGS_QDMA) {
1292 		if (ring_no)
1293 			return -EINVAL;
1294 		ring = &eth->rx_ring_qdma;
1295 		offset = 0x1000;
1296 	} else {
1297 		ring = &eth->rx_ring[ring_no];
1298 	}
1299 
1300 	if (rx_flag == MTK_RX_FLAGS_HWLRO) {
1301 		rx_data_len = MTK_MAX_LRO_RX_LENGTH;
1302 		rx_dma_size = MTK_HW_LRO_DMA_SIZE;
1303 	} else {
1304 		rx_data_len = ETH_DATA_LEN;
1305 		rx_dma_size = MTK_DMA_SIZE;
1306 	}
1307 
1308 	ring->frag_size = mtk_max_frag_size(rx_data_len);
1309 	ring->buf_size = mtk_max_buf_size(ring->frag_size);
1310 	ring->data = kcalloc(rx_dma_size, sizeof(*ring->data),
1311 			     GFP_KERNEL);
1312 	if (!ring->data)
1313 		return -ENOMEM;
1314 
1315 	for (i = 0; i < rx_dma_size; i++) {
1316 		ring->data[i] = netdev_alloc_frag(ring->frag_size);
1317 		if (!ring->data[i])
1318 			return -ENOMEM;
1319 	}
1320 
1321 	ring->dma = dma_alloc_coherent(eth->dev,
1322 				       rx_dma_size * sizeof(*ring->dma),
1323 				       &ring->phys,
1324 				       GFP_ATOMIC | __GFP_ZERO);
1325 	if (!ring->dma)
1326 		return -ENOMEM;
1327 
1328 	for (i = 0; i < rx_dma_size; i++) {
1329 		dma_addr_t dma_addr = dma_map_single(eth->dev,
1330 				ring->data[i] + NET_SKB_PAD,
1331 				ring->buf_size,
1332 				DMA_FROM_DEVICE);
1333 		if (unlikely(dma_mapping_error(eth->dev, dma_addr)))
1334 			return -ENOMEM;
1335 		ring->dma[i].rxd1 = (unsigned int)dma_addr;
1336 
1337 		ring->dma[i].rxd2 = RX_DMA_PLEN0(ring->buf_size);
1338 	}
1339 	ring->dma_size = rx_dma_size;
1340 	ring->calc_idx_update = false;
1341 	ring->calc_idx = rx_dma_size - 1;
1342 	ring->crx_idx_reg = MTK_PRX_CRX_IDX_CFG(ring_no);
1343 	/* make sure that all changes to the dma ring are flushed before we
1344 	 * continue
1345 	 */
1346 	wmb();
1347 
1348 	mtk_w32(eth, ring->phys, MTK_PRX_BASE_PTR_CFG(ring_no) + offset);
1349 	mtk_w32(eth, rx_dma_size, MTK_PRX_MAX_CNT_CFG(ring_no) + offset);
1350 	mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg + offset);
1351 	mtk_w32(eth, MTK_PST_DRX_IDX_CFG(ring_no), MTK_PDMA_RST_IDX + offset);
1352 
1353 	return 0;
1354 }
1355 
1356 static void mtk_rx_clean(struct mtk_eth *eth, struct mtk_rx_ring *ring)
1357 {
1358 	int i;
1359 
1360 	if (ring->data && ring->dma) {
1361 		for (i = 0; i < ring->dma_size; i++) {
1362 			if (!ring->data[i])
1363 				continue;
1364 			if (!ring->dma[i].rxd1)
1365 				continue;
1366 			dma_unmap_single(eth->dev,
1367 					 ring->dma[i].rxd1,
1368 					 ring->buf_size,
1369 					 DMA_FROM_DEVICE);
1370 			skb_free_frag(ring->data[i]);
1371 		}
1372 		kfree(ring->data);
1373 		ring->data = NULL;
1374 	}
1375 
1376 	if (ring->dma) {
1377 		dma_free_coherent(eth->dev,
1378 				  ring->dma_size * sizeof(*ring->dma),
1379 				  ring->dma,
1380 				  ring->phys);
1381 		ring->dma = NULL;
1382 	}
1383 }
1384 
1385 static int mtk_hwlro_rx_init(struct mtk_eth *eth)
1386 {
1387 	int i;
1388 	u32 ring_ctrl_dw1 = 0, ring_ctrl_dw2 = 0, ring_ctrl_dw3 = 0;
1389 	u32 lro_ctrl_dw0 = 0, lro_ctrl_dw3 = 0;
1390 
1391 	/* set LRO rings to auto-learn modes */
1392 	ring_ctrl_dw2 |= MTK_RING_AUTO_LERAN_MODE;
1393 
1394 	/* validate LRO ring */
1395 	ring_ctrl_dw2 |= MTK_RING_VLD;
1396 
1397 	/* set AGE timer (unit: 20us) */
1398 	ring_ctrl_dw2 |= MTK_RING_AGE_TIME_H;
1399 	ring_ctrl_dw1 |= MTK_RING_AGE_TIME_L;
1400 
1401 	/* set max AGG timer (unit: 20us) */
1402 	ring_ctrl_dw2 |= MTK_RING_MAX_AGG_TIME;
1403 
1404 	/* set max LRO AGG count */
1405 	ring_ctrl_dw2 |= MTK_RING_MAX_AGG_CNT_L;
1406 	ring_ctrl_dw3 |= MTK_RING_MAX_AGG_CNT_H;
1407 
1408 	for (i = 1; i < MTK_MAX_RX_RING_NUM; i++) {
1409 		mtk_w32(eth, ring_ctrl_dw1, MTK_LRO_CTRL_DW1_CFG(i));
1410 		mtk_w32(eth, ring_ctrl_dw2, MTK_LRO_CTRL_DW2_CFG(i));
1411 		mtk_w32(eth, ring_ctrl_dw3, MTK_LRO_CTRL_DW3_CFG(i));
1412 	}
1413 
1414 	/* IPv4 checksum update enable */
1415 	lro_ctrl_dw0 |= MTK_L3_CKS_UPD_EN;
1416 
1417 	/* switch priority comparison to packet count mode */
1418 	lro_ctrl_dw0 |= MTK_LRO_ALT_PKT_CNT_MODE;
1419 
1420 	/* bandwidth threshold setting */
1421 	mtk_w32(eth, MTK_HW_LRO_BW_THRE, MTK_PDMA_LRO_CTRL_DW2);
1422 
1423 	/* auto-learn score delta setting */
1424 	mtk_w32(eth, MTK_HW_LRO_REPLACE_DELTA, MTK_PDMA_LRO_ALT_SCORE_DELTA);
1425 
1426 	/* set refresh timer for altering flows to 1 sec. (unit: 20us) */
1427 	mtk_w32(eth, (MTK_HW_LRO_TIMER_UNIT << 16) | MTK_HW_LRO_REFRESH_TIME,
1428 		MTK_PDMA_LRO_ALT_REFRESH_TIMER);
1429 
1430 	/* set HW LRO mode & the max aggregation count for rx packets */
1431 	lro_ctrl_dw3 |= MTK_ADMA_MODE | (MTK_HW_LRO_MAX_AGG_CNT & 0xff);
1432 
1433 	/* the minimal remaining room of SDL0 in RXD for lro aggregation */
1434 	lro_ctrl_dw3 |= MTK_LRO_MIN_RXD_SDL;
1435 
1436 	/* enable HW LRO */
1437 	lro_ctrl_dw0 |= MTK_LRO_EN;
1438 
1439 	mtk_w32(eth, lro_ctrl_dw3, MTK_PDMA_LRO_CTRL_DW3);
1440 	mtk_w32(eth, lro_ctrl_dw0, MTK_PDMA_LRO_CTRL_DW0);
1441 
1442 	return 0;
1443 }
1444 
1445 static void mtk_hwlro_rx_uninit(struct mtk_eth *eth)
1446 {
1447 	int i;
1448 	u32 val;
1449 
1450 	/* relinquish lro rings, flush aggregated packets */
1451 	mtk_w32(eth, MTK_LRO_RING_RELINQUISH_REQ, MTK_PDMA_LRO_CTRL_DW0);
1452 
1453 	/* wait for relinquishments done */
1454 	for (i = 0; i < 10; i++) {
1455 		val = mtk_r32(eth, MTK_PDMA_LRO_CTRL_DW0);
1456 		if (val & MTK_LRO_RING_RELINQUISH_DONE) {
1457 			msleep(20);
1458 			continue;
1459 		}
1460 		break;
1461 	}
1462 
1463 	/* invalidate lro rings */
1464 	for (i = 1; i < MTK_MAX_RX_RING_NUM; i++)
1465 		mtk_w32(eth, 0, MTK_LRO_CTRL_DW2_CFG(i));
1466 
1467 	/* disable HW LRO */
1468 	mtk_w32(eth, 0, MTK_PDMA_LRO_CTRL_DW0);
1469 }
1470 
1471 static void mtk_hwlro_val_ipaddr(struct mtk_eth *eth, int idx, __be32 ip)
1472 {
1473 	u32 reg_val;
1474 
1475 	reg_val = mtk_r32(eth, MTK_LRO_CTRL_DW2_CFG(idx));
1476 
1477 	/* invalidate the IP setting */
1478 	mtk_w32(eth, (reg_val & ~MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1479 
1480 	mtk_w32(eth, ip, MTK_LRO_DIP_DW0_CFG(idx));
1481 
1482 	/* validate the IP setting */
1483 	mtk_w32(eth, (reg_val | MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1484 }
1485 
1486 static void mtk_hwlro_inval_ipaddr(struct mtk_eth *eth, int idx)
1487 {
1488 	u32 reg_val;
1489 
1490 	reg_val = mtk_r32(eth, MTK_LRO_CTRL_DW2_CFG(idx));
1491 
1492 	/* invalidate the IP setting */
1493 	mtk_w32(eth, (reg_val & ~MTK_RING_MYIP_VLD), MTK_LRO_CTRL_DW2_CFG(idx));
1494 
1495 	mtk_w32(eth, 0, MTK_LRO_DIP_DW0_CFG(idx));
1496 }
1497 
1498 static int mtk_hwlro_get_ip_cnt(struct mtk_mac *mac)
1499 {
1500 	int cnt = 0;
1501 	int i;
1502 
1503 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1504 		if (mac->hwlro_ip[i])
1505 			cnt++;
1506 	}
1507 
1508 	return cnt;
1509 }
1510 
1511 static int mtk_hwlro_add_ipaddr(struct net_device *dev,
1512 				struct ethtool_rxnfc *cmd)
1513 {
1514 	struct ethtool_rx_flow_spec *fsp =
1515 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1516 	struct mtk_mac *mac = netdev_priv(dev);
1517 	struct mtk_eth *eth = mac->hw;
1518 	int hwlro_idx;
1519 
1520 	if ((fsp->flow_type != TCP_V4_FLOW) ||
1521 	    (!fsp->h_u.tcp_ip4_spec.ip4dst) ||
1522 	    (fsp->location > 1))
1523 		return -EINVAL;
1524 
1525 	mac->hwlro_ip[fsp->location] = htonl(fsp->h_u.tcp_ip4_spec.ip4dst);
1526 	hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + fsp->location;
1527 
1528 	mac->hwlro_ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1529 
1530 	mtk_hwlro_val_ipaddr(eth, hwlro_idx, mac->hwlro_ip[fsp->location]);
1531 
1532 	return 0;
1533 }
1534 
1535 static int mtk_hwlro_del_ipaddr(struct net_device *dev,
1536 				struct ethtool_rxnfc *cmd)
1537 {
1538 	struct ethtool_rx_flow_spec *fsp =
1539 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1540 	struct mtk_mac *mac = netdev_priv(dev);
1541 	struct mtk_eth *eth = mac->hw;
1542 	int hwlro_idx;
1543 
1544 	if (fsp->location > 1)
1545 		return -EINVAL;
1546 
1547 	mac->hwlro_ip[fsp->location] = 0;
1548 	hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + fsp->location;
1549 
1550 	mac->hwlro_ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1551 
1552 	mtk_hwlro_inval_ipaddr(eth, hwlro_idx);
1553 
1554 	return 0;
1555 }
1556 
1557 static void mtk_hwlro_netdev_disable(struct net_device *dev)
1558 {
1559 	struct mtk_mac *mac = netdev_priv(dev);
1560 	struct mtk_eth *eth = mac->hw;
1561 	int i, hwlro_idx;
1562 
1563 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1564 		mac->hwlro_ip[i] = 0;
1565 		hwlro_idx = (mac->id * MTK_MAX_LRO_IP_CNT) + i;
1566 
1567 		mtk_hwlro_inval_ipaddr(eth, hwlro_idx);
1568 	}
1569 
1570 	mac->hwlro_ip_cnt = 0;
1571 }
1572 
1573 static int mtk_hwlro_get_fdir_entry(struct net_device *dev,
1574 				    struct ethtool_rxnfc *cmd)
1575 {
1576 	struct mtk_mac *mac = netdev_priv(dev);
1577 	struct ethtool_rx_flow_spec *fsp =
1578 		(struct ethtool_rx_flow_spec *)&cmd->fs;
1579 
1580 	/* only tcp dst ipv4 is meaningful, others are meaningless */
1581 	fsp->flow_type = TCP_V4_FLOW;
1582 	fsp->h_u.tcp_ip4_spec.ip4dst = ntohl(mac->hwlro_ip[fsp->location]);
1583 	fsp->m_u.tcp_ip4_spec.ip4dst = 0;
1584 
1585 	fsp->h_u.tcp_ip4_spec.ip4src = 0;
1586 	fsp->m_u.tcp_ip4_spec.ip4src = 0xffffffff;
1587 	fsp->h_u.tcp_ip4_spec.psrc = 0;
1588 	fsp->m_u.tcp_ip4_spec.psrc = 0xffff;
1589 	fsp->h_u.tcp_ip4_spec.pdst = 0;
1590 	fsp->m_u.tcp_ip4_spec.pdst = 0xffff;
1591 	fsp->h_u.tcp_ip4_spec.tos = 0;
1592 	fsp->m_u.tcp_ip4_spec.tos = 0xff;
1593 
1594 	return 0;
1595 }
1596 
1597 static int mtk_hwlro_get_fdir_all(struct net_device *dev,
1598 				  struct ethtool_rxnfc *cmd,
1599 				  u32 *rule_locs)
1600 {
1601 	struct mtk_mac *mac = netdev_priv(dev);
1602 	int cnt = 0;
1603 	int i;
1604 
1605 	for (i = 0; i < MTK_MAX_LRO_IP_CNT; i++) {
1606 		if (mac->hwlro_ip[i]) {
1607 			rule_locs[cnt] = i;
1608 			cnt++;
1609 		}
1610 	}
1611 
1612 	cmd->rule_cnt = cnt;
1613 
1614 	return 0;
1615 }
1616 
1617 static netdev_features_t mtk_fix_features(struct net_device *dev,
1618 					  netdev_features_t features)
1619 {
1620 	if (!(features & NETIF_F_LRO)) {
1621 		struct mtk_mac *mac = netdev_priv(dev);
1622 		int ip_cnt = mtk_hwlro_get_ip_cnt(mac);
1623 
1624 		if (ip_cnt) {
1625 			netdev_info(dev, "RX flow is programmed, LRO should keep on\n");
1626 
1627 			features |= NETIF_F_LRO;
1628 		}
1629 	}
1630 
1631 	return features;
1632 }
1633 
1634 static int mtk_set_features(struct net_device *dev, netdev_features_t features)
1635 {
1636 	int err = 0;
1637 
1638 	if (!((dev->features ^ features) & NETIF_F_LRO))
1639 		return 0;
1640 
1641 	if (!(features & NETIF_F_LRO))
1642 		mtk_hwlro_netdev_disable(dev);
1643 
1644 	return err;
1645 }
1646 
1647 /* wait for DMA to finish whatever it is doing before we start using it again */
1648 static int mtk_dma_busy_wait(struct mtk_eth *eth)
1649 {
1650 	unsigned long t_start = jiffies;
1651 
1652 	while (1) {
1653 		if (!(mtk_r32(eth, MTK_QDMA_GLO_CFG) &
1654 		      (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)))
1655 			return 0;
1656 		if (time_after(jiffies, t_start + MTK_DMA_BUSY_TIMEOUT))
1657 			break;
1658 	}
1659 
1660 	dev_err(eth->dev, "DMA init timeout\n");
1661 	return -1;
1662 }
1663 
1664 static int mtk_dma_init(struct mtk_eth *eth)
1665 {
1666 	int err;
1667 	u32 i;
1668 
1669 	if (mtk_dma_busy_wait(eth))
1670 		return -EBUSY;
1671 
1672 	/* QDMA needs scratch memory for internal reordering of the
1673 	 * descriptors
1674 	 */
1675 	err = mtk_init_fq_dma(eth);
1676 	if (err)
1677 		return err;
1678 
1679 	err = mtk_tx_alloc(eth);
1680 	if (err)
1681 		return err;
1682 
1683 	err = mtk_rx_alloc(eth, 0, MTK_RX_FLAGS_QDMA);
1684 	if (err)
1685 		return err;
1686 
1687 	err = mtk_rx_alloc(eth, 0, MTK_RX_FLAGS_NORMAL);
1688 	if (err)
1689 		return err;
1690 
1691 	if (eth->hwlro) {
1692 		for (i = 1; i < MTK_MAX_RX_RING_NUM; i++) {
1693 			err = mtk_rx_alloc(eth, i, MTK_RX_FLAGS_HWLRO);
1694 			if (err)
1695 				return err;
1696 		}
1697 		err = mtk_hwlro_rx_init(eth);
1698 		if (err)
1699 			return err;
1700 	}
1701 
1702 	/* Enable random early drop and set drop threshold automatically */
1703 	mtk_w32(eth, FC_THRES_DROP_MODE | FC_THRES_DROP_EN | FC_THRES_MIN,
1704 		MTK_QDMA_FC_THRES);
1705 	mtk_w32(eth, 0x0, MTK_QDMA_HRED2);
1706 
1707 	return 0;
1708 }
1709 
1710 static void mtk_dma_free(struct mtk_eth *eth)
1711 {
1712 	int i;
1713 
1714 	for (i = 0; i < MTK_MAC_COUNT; i++)
1715 		if (eth->netdev[i])
1716 			netdev_reset_queue(eth->netdev[i]);
1717 	if (eth->scratch_ring) {
1718 		dma_free_coherent(eth->dev,
1719 				  MTK_DMA_SIZE * sizeof(struct mtk_tx_dma),
1720 				  eth->scratch_ring,
1721 				  eth->phy_scratch_ring);
1722 		eth->scratch_ring = NULL;
1723 		eth->phy_scratch_ring = 0;
1724 	}
1725 	mtk_tx_clean(eth);
1726 	mtk_rx_clean(eth, &eth->rx_ring[0]);
1727 	mtk_rx_clean(eth, &eth->rx_ring_qdma);
1728 
1729 	if (eth->hwlro) {
1730 		mtk_hwlro_rx_uninit(eth);
1731 		for (i = 1; i < MTK_MAX_RX_RING_NUM; i++)
1732 			mtk_rx_clean(eth, &eth->rx_ring[i]);
1733 	}
1734 
1735 	kfree(eth->scratch_head);
1736 }
1737 
1738 static void mtk_tx_timeout(struct net_device *dev)
1739 {
1740 	struct mtk_mac *mac = netdev_priv(dev);
1741 	struct mtk_eth *eth = mac->hw;
1742 
1743 	eth->netdev[mac->id]->stats.tx_errors++;
1744 	netif_err(eth, tx_err, dev,
1745 		  "transmit timed out\n");
1746 	schedule_work(&eth->pending_work);
1747 }
1748 
1749 static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
1750 {
1751 	struct mtk_eth *eth = _eth;
1752 
1753 	if (likely(napi_schedule_prep(&eth->rx_napi))) {
1754 		__napi_schedule(&eth->rx_napi);
1755 		mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1756 	}
1757 
1758 	return IRQ_HANDLED;
1759 }
1760 
1761 static irqreturn_t mtk_handle_irq_tx(int irq, void *_eth)
1762 {
1763 	struct mtk_eth *eth = _eth;
1764 
1765 	if (likely(napi_schedule_prep(&eth->tx_napi))) {
1766 		__napi_schedule(&eth->tx_napi);
1767 		mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1768 	}
1769 
1770 	return IRQ_HANDLED;
1771 }
1772 
1773 #ifdef CONFIG_NET_POLL_CONTROLLER
1774 static void mtk_poll_controller(struct net_device *dev)
1775 {
1776 	struct mtk_mac *mac = netdev_priv(dev);
1777 	struct mtk_eth *eth = mac->hw;
1778 
1779 	mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1780 	mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1781 	mtk_handle_irq_rx(eth->irq[2], dev);
1782 	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1783 	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1784 }
1785 #endif
1786 
1787 static int mtk_start_dma(struct mtk_eth *eth)
1788 {
1789 	int err;
1790 
1791 	err = mtk_dma_init(eth);
1792 	if (err) {
1793 		mtk_dma_free(eth);
1794 		return err;
1795 	}
1796 
1797 	mtk_w32(eth,
1798 		MTK_TX_WB_DDONE | MTK_TX_DMA_EN |
1799 		MTK_DMA_SIZE_16DWORDS | MTK_NDP_CO_PRO |
1800 		MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
1801 		MTK_RX_BT_32DWORDS,
1802 		MTK_QDMA_GLO_CFG);
1803 
1804 	mtk_w32(eth,
1805 		MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
1806 		MTK_RX_BT_32DWORDS | MTK_MULTI_EN,
1807 		MTK_PDMA_GLO_CFG);
1808 
1809 	return 0;
1810 }
1811 
1812 static int mtk_open(struct net_device *dev)
1813 {
1814 	struct mtk_mac *mac = netdev_priv(dev);
1815 	struct mtk_eth *eth = mac->hw;
1816 
1817 	/* we run 2 netdevs on the same dma ring so we only bring it up once */
1818 	if (!refcount_read(&eth->dma_refcnt)) {
1819 		int err = mtk_start_dma(eth);
1820 
1821 		if (err)
1822 			return err;
1823 
1824 		napi_enable(&eth->tx_napi);
1825 		napi_enable(&eth->rx_napi);
1826 		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
1827 		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
1828 		refcount_set(&eth->dma_refcnt, 1);
1829 	}
1830 	else
1831 		refcount_inc(&eth->dma_refcnt);
1832 
1833 	phy_start(dev->phydev);
1834 	netif_start_queue(dev);
1835 
1836 	return 0;
1837 }
1838 
1839 static void mtk_stop_dma(struct mtk_eth *eth, u32 glo_cfg)
1840 {
1841 	u32 val;
1842 	int i;
1843 
1844 	/* stop the dma engine */
1845 	spin_lock_bh(&eth->page_lock);
1846 	val = mtk_r32(eth, glo_cfg);
1847 	mtk_w32(eth, val & ~(MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN),
1848 		glo_cfg);
1849 	spin_unlock_bh(&eth->page_lock);
1850 
1851 	/* wait for dma stop */
1852 	for (i = 0; i < 10; i++) {
1853 		val = mtk_r32(eth, glo_cfg);
1854 		if (val & (MTK_TX_DMA_BUSY | MTK_RX_DMA_BUSY)) {
1855 			msleep(20);
1856 			continue;
1857 		}
1858 		break;
1859 	}
1860 }
1861 
1862 static int mtk_stop(struct net_device *dev)
1863 {
1864 	struct mtk_mac *mac = netdev_priv(dev);
1865 	struct mtk_eth *eth = mac->hw;
1866 
1867 	netif_tx_disable(dev);
1868 	phy_stop(dev->phydev);
1869 
1870 	/* only shutdown DMA if this is the last user */
1871 	if (!refcount_dec_and_test(&eth->dma_refcnt))
1872 		return 0;
1873 
1874 	mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
1875 	mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
1876 	napi_disable(&eth->tx_napi);
1877 	napi_disable(&eth->rx_napi);
1878 
1879 	mtk_stop_dma(eth, MTK_QDMA_GLO_CFG);
1880 	mtk_stop_dma(eth, MTK_PDMA_GLO_CFG);
1881 
1882 	mtk_dma_free(eth);
1883 
1884 	return 0;
1885 }
1886 
1887 static void ethsys_reset(struct mtk_eth *eth, u32 reset_bits)
1888 {
1889 	regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
1890 			   reset_bits,
1891 			   reset_bits);
1892 
1893 	usleep_range(1000, 1100);
1894 	regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
1895 			   reset_bits,
1896 			   ~reset_bits);
1897 	mdelay(10);
1898 }
1899 
1900 static void mtk_clk_disable(struct mtk_eth *eth)
1901 {
1902 	int clk;
1903 
1904 	for (clk = MTK_CLK_MAX - 1; clk >= 0; clk--)
1905 		clk_disable_unprepare(eth->clks[clk]);
1906 }
1907 
1908 static int mtk_clk_enable(struct mtk_eth *eth)
1909 {
1910 	int clk, ret;
1911 
1912 	for (clk = 0; clk < MTK_CLK_MAX ; clk++) {
1913 		ret = clk_prepare_enable(eth->clks[clk]);
1914 		if (ret)
1915 			goto err_disable_clks;
1916 	}
1917 
1918 	return 0;
1919 
1920 err_disable_clks:
1921 	while (--clk >= 0)
1922 		clk_disable_unprepare(eth->clks[clk]);
1923 
1924 	return ret;
1925 }
1926 
1927 static int mtk_hw_init(struct mtk_eth *eth)
1928 {
1929 	int i, val, ret;
1930 
1931 	if (test_and_set_bit(MTK_HW_INIT, &eth->state))
1932 		return 0;
1933 
1934 	pm_runtime_enable(eth->dev);
1935 	pm_runtime_get_sync(eth->dev);
1936 
1937 	ret = mtk_clk_enable(eth);
1938 	if (ret)
1939 		goto err_disable_pm;
1940 
1941 	ethsys_reset(eth, RSTCTRL_FE);
1942 	ethsys_reset(eth, RSTCTRL_PPE);
1943 
1944 	regmap_read(eth->ethsys, ETHSYS_SYSCFG0, &val);
1945 	for (i = 0; i < MTK_MAC_COUNT; i++) {
1946 		if (!eth->mac[i])
1947 			continue;
1948 		val &= ~SYSCFG0_GE_MODE(SYSCFG0_GE_MASK, eth->mac[i]->id);
1949 		val |= SYSCFG0_GE_MODE(eth->mac[i]->ge_mode, eth->mac[i]->id);
1950 	}
1951 	regmap_write(eth->ethsys, ETHSYS_SYSCFG0, val);
1952 
1953 	if (eth->pctl) {
1954 		/* Set GE2 driving and slew rate */
1955 		regmap_write(eth->pctl, GPIO_DRV_SEL10, 0xa00);
1956 
1957 		/* set GE2 TDSEL */
1958 		regmap_write(eth->pctl, GPIO_OD33_CTRL8, 0x5);
1959 
1960 		/* set GE2 TUNE */
1961 		regmap_write(eth->pctl, GPIO_BIAS_CTRL, 0x0);
1962 	}
1963 
1964 	/* Set linkdown as the default for each GMAC. Its own MCR would be set
1965 	 * up with the more appropriate value when mtk_phy_link_adjust call is
1966 	 * being invoked.
1967 	 */
1968 	for (i = 0; i < MTK_MAC_COUNT; i++)
1969 		mtk_w32(eth, 0, MTK_MAC_MCR(i));
1970 
1971 	/* Indicates CDM to parse the MTK special tag from CPU
1972 	 * which also is working out for untag packets.
1973 	 */
1974 	val = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
1975 	mtk_w32(eth, val | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
1976 
1977 	/* Enable RX VLan Offloading */
1978 	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
1979 
1980 	/* enable interrupt delay for RX */
1981 	mtk_w32(eth, MTK_PDMA_DELAY_RX_DELAY, MTK_PDMA_DELAY_INT);
1982 
1983 	/* disable delay and normal interrupt */
1984 	mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
1985 	mtk_tx_irq_disable(eth, ~0);
1986 	mtk_rx_irq_disable(eth, ~0);
1987 	mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
1988 	mtk_w32(eth, 0, MTK_RST_GL);
1989 
1990 	/* FE int grouping */
1991 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_PDMA_INT_GRP1);
1992 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_GRP2);
1993 	mtk_w32(eth, MTK_TX_DONE_INT, MTK_QDMA_INT_GRP1);
1994 	mtk_w32(eth, MTK_RX_DONE_INT, MTK_QDMA_INT_GRP2);
1995 	mtk_w32(eth, 0x21021000, MTK_FE_INT_GRP);
1996 
1997 	for (i = 0; i < 2; i++) {
1998 		u32 val = mtk_r32(eth, MTK_GDMA_FWD_CFG(i));
1999 
2000 		/* setup the forward port to send frame to PDMA */
2001 		val &= ~0xffff;
2002 
2003 		/* Enable RX checksum */
2004 		val |= MTK_GDMA_ICS_EN | MTK_GDMA_TCS_EN | MTK_GDMA_UCS_EN;
2005 
2006 		/* setup the mac dma */
2007 		mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
2008 	}
2009 
2010 	return 0;
2011 
2012 err_disable_pm:
2013 	pm_runtime_put_sync(eth->dev);
2014 	pm_runtime_disable(eth->dev);
2015 
2016 	return ret;
2017 }
2018 
2019 static int mtk_hw_deinit(struct mtk_eth *eth)
2020 {
2021 	if (!test_and_clear_bit(MTK_HW_INIT, &eth->state))
2022 		return 0;
2023 
2024 	mtk_clk_disable(eth);
2025 
2026 	pm_runtime_put_sync(eth->dev);
2027 	pm_runtime_disable(eth->dev);
2028 
2029 	return 0;
2030 }
2031 
2032 static int __init mtk_init(struct net_device *dev)
2033 {
2034 	struct mtk_mac *mac = netdev_priv(dev);
2035 	struct mtk_eth *eth = mac->hw;
2036 	const char *mac_addr;
2037 
2038 	mac_addr = of_get_mac_address(mac->of_node);
2039 	if (mac_addr)
2040 		ether_addr_copy(dev->dev_addr, mac_addr);
2041 
2042 	/* If the mac address is invalid, use random mac address  */
2043 	if (!is_valid_ether_addr(dev->dev_addr)) {
2044 		eth_hw_addr_random(dev);
2045 		dev_err(eth->dev, "generated random MAC address %pM\n",
2046 			dev->dev_addr);
2047 	}
2048 
2049 	return mtk_phy_connect(dev);
2050 }
2051 
2052 static void mtk_uninit(struct net_device *dev)
2053 {
2054 	struct mtk_mac *mac = netdev_priv(dev);
2055 	struct mtk_eth *eth = mac->hw;
2056 
2057 	phy_disconnect(dev->phydev);
2058 	if (of_phy_is_fixed_link(mac->of_node))
2059 		of_phy_deregister_fixed_link(mac->of_node);
2060 	mtk_tx_irq_disable(eth, ~0);
2061 	mtk_rx_irq_disable(eth, ~0);
2062 }
2063 
2064 static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
2065 {
2066 	switch (cmd) {
2067 	case SIOCGMIIPHY:
2068 	case SIOCGMIIREG:
2069 	case SIOCSMIIREG:
2070 		return phy_mii_ioctl(dev->phydev, ifr, cmd);
2071 	default:
2072 		break;
2073 	}
2074 
2075 	return -EOPNOTSUPP;
2076 }
2077 
2078 static void mtk_pending_work(struct work_struct *work)
2079 {
2080 	struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work);
2081 	int err, i;
2082 	unsigned long restart = 0;
2083 
2084 	rtnl_lock();
2085 
2086 	dev_dbg(eth->dev, "[%s][%d] reset\n", __func__, __LINE__);
2087 
2088 	while (test_and_set_bit_lock(MTK_RESETTING, &eth->state))
2089 		cpu_relax();
2090 
2091 	dev_dbg(eth->dev, "[%s][%d] mtk_stop starts\n", __func__, __LINE__);
2092 	/* stop all devices to make sure that dma is properly shut down */
2093 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2094 		if (!eth->netdev[i])
2095 			continue;
2096 		mtk_stop(eth->netdev[i]);
2097 		__set_bit(i, &restart);
2098 	}
2099 	dev_dbg(eth->dev, "[%s][%d] mtk_stop ends\n", __func__, __LINE__);
2100 
2101 	/* restart underlying hardware such as power, clock, pin mux
2102 	 * and the connected phy
2103 	 */
2104 	mtk_hw_deinit(eth);
2105 
2106 	if (eth->dev->pins)
2107 		pinctrl_select_state(eth->dev->pins->p,
2108 				     eth->dev->pins->default_state);
2109 	mtk_hw_init(eth);
2110 
2111 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2112 		if (!eth->mac[i] ||
2113 		    of_phy_is_fixed_link(eth->mac[i]->of_node))
2114 			continue;
2115 		err = phy_init_hw(eth->netdev[i]->phydev);
2116 		if (err)
2117 			dev_err(eth->dev, "%s: PHY init failed.\n",
2118 				eth->netdev[i]->name);
2119 	}
2120 
2121 	/* restart DMA and enable IRQs */
2122 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2123 		if (!test_bit(i, &restart))
2124 			continue;
2125 		err = mtk_open(eth->netdev[i]);
2126 		if (err) {
2127 			netif_alert(eth, ifup, eth->netdev[i],
2128 			      "Driver up/down cycle failed, closing device.\n");
2129 			dev_close(eth->netdev[i]);
2130 		}
2131 	}
2132 
2133 	dev_dbg(eth->dev, "[%s][%d] reset done\n", __func__, __LINE__);
2134 
2135 	clear_bit_unlock(MTK_RESETTING, &eth->state);
2136 
2137 	rtnl_unlock();
2138 }
2139 
2140 static int mtk_free_dev(struct mtk_eth *eth)
2141 {
2142 	int i;
2143 
2144 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2145 		if (!eth->netdev[i])
2146 			continue;
2147 		free_netdev(eth->netdev[i]);
2148 	}
2149 
2150 	return 0;
2151 }
2152 
2153 static int mtk_unreg_dev(struct mtk_eth *eth)
2154 {
2155 	int i;
2156 
2157 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2158 		if (!eth->netdev[i])
2159 			continue;
2160 		unregister_netdev(eth->netdev[i]);
2161 	}
2162 
2163 	return 0;
2164 }
2165 
2166 static int mtk_cleanup(struct mtk_eth *eth)
2167 {
2168 	mtk_unreg_dev(eth);
2169 	mtk_free_dev(eth);
2170 	cancel_work_sync(&eth->pending_work);
2171 
2172 	return 0;
2173 }
2174 
2175 static int mtk_get_link_ksettings(struct net_device *ndev,
2176 				  struct ethtool_link_ksettings *cmd)
2177 {
2178 	struct mtk_mac *mac = netdev_priv(ndev);
2179 
2180 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2181 		return -EBUSY;
2182 
2183 	phy_ethtool_ksettings_get(ndev->phydev, cmd);
2184 
2185 	return 0;
2186 }
2187 
2188 static int mtk_set_link_ksettings(struct net_device *ndev,
2189 				  const struct ethtool_link_ksettings *cmd)
2190 {
2191 	struct mtk_mac *mac = netdev_priv(ndev);
2192 
2193 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2194 		return -EBUSY;
2195 
2196 	return phy_ethtool_ksettings_set(ndev->phydev, cmd);
2197 }
2198 
2199 static void mtk_get_drvinfo(struct net_device *dev,
2200 			    struct ethtool_drvinfo *info)
2201 {
2202 	struct mtk_mac *mac = netdev_priv(dev);
2203 
2204 	strlcpy(info->driver, mac->hw->dev->driver->name, sizeof(info->driver));
2205 	strlcpy(info->bus_info, dev_name(mac->hw->dev), sizeof(info->bus_info));
2206 	info->n_stats = ARRAY_SIZE(mtk_ethtool_stats);
2207 }
2208 
2209 static u32 mtk_get_msglevel(struct net_device *dev)
2210 {
2211 	struct mtk_mac *mac = netdev_priv(dev);
2212 
2213 	return mac->hw->msg_enable;
2214 }
2215 
2216 static void mtk_set_msglevel(struct net_device *dev, u32 value)
2217 {
2218 	struct mtk_mac *mac = netdev_priv(dev);
2219 
2220 	mac->hw->msg_enable = value;
2221 }
2222 
2223 static int mtk_nway_reset(struct net_device *dev)
2224 {
2225 	struct mtk_mac *mac = netdev_priv(dev);
2226 
2227 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2228 		return -EBUSY;
2229 
2230 	return genphy_restart_aneg(dev->phydev);
2231 }
2232 
2233 static u32 mtk_get_link(struct net_device *dev)
2234 {
2235 	struct mtk_mac *mac = netdev_priv(dev);
2236 	int err;
2237 
2238 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2239 		return -EBUSY;
2240 
2241 	err = genphy_update_link(dev->phydev);
2242 	if (err)
2243 		return ethtool_op_get_link(dev);
2244 
2245 	return dev->phydev->link;
2246 }
2247 
2248 static void mtk_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2249 {
2250 	int i;
2251 
2252 	switch (stringset) {
2253 	case ETH_SS_STATS:
2254 		for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++) {
2255 			memcpy(data, mtk_ethtool_stats[i].str, ETH_GSTRING_LEN);
2256 			data += ETH_GSTRING_LEN;
2257 		}
2258 		break;
2259 	}
2260 }
2261 
2262 static int mtk_get_sset_count(struct net_device *dev, int sset)
2263 {
2264 	switch (sset) {
2265 	case ETH_SS_STATS:
2266 		return ARRAY_SIZE(mtk_ethtool_stats);
2267 	default:
2268 		return -EOPNOTSUPP;
2269 	}
2270 }
2271 
2272 static void mtk_get_ethtool_stats(struct net_device *dev,
2273 				  struct ethtool_stats *stats, u64 *data)
2274 {
2275 	struct mtk_mac *mac = netdev_priv(dev);
2276 	struct mtk_hw_stats *hwstats = mac->hw_stats;
2277 	u64 *data_src, *data_dst;
2278 	unsigned int start;
2279 	int i;
2280 
2281 	if (unlikely(test_bit(MTK_RESETTING, &mac->hw->state)))
2282 		return;
2283 
2284 	if (netif_running(dev) && netif_device_present(dev)) {
2285 		if (spin_trylock_bh(&hwstats->stats_lock)) {
2286 			mtk_stats_update_mac(mac);
2287 			spin_unlock_bh(&hwstats->stats_lock);
2288 		}
2289 	}
2290 
2291 	data_src = (u64 *)hwstats;
2292 
2293 	do {
2294 		data_dst = data;
2295 		start = u64_stats_fetch_begin_irq(&hwstats->syncp);
2296 
2297 		for (i = 0; i < ARRAY_SIZE(mtk_ethtool_stats); i++)
2298 			*data_dst++ = *(data_src + mtk_ethtool_stats[i].offset);
2299 	} while (u64_stats_fetch_retry_irq(&hwstats->syncp, start));
2300 }
2301 
2302 static int mtk_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
2303 			 u32 *rule_locs)
2304 {
2305 	int ret = -EOPNOTSUPP;
2306 
2307 	switch (cmd->cmd) {
2308 	case ETHTOOL_GRXRINGS:
2309 		if (dev->features & NETIF_F_LRO) {
2310 			cmd->data = MTK_MAX_RX_RING_NUM;
2311 			ret = 0;
2312 		}
2313 		break;
2314 	case ETHTOOL_GRXCLSRLCNT:
2315 		if (dev->features & NETIF_F_LRO) {
2316 			struct mtk_mac *mac = netdev_priv(dev);
2317 
2318 			cmd->rule_cnt = mac->hwlro_ip_cnt;
2319 			ret = 0;
2320 		}
2321 		break;
2322 	case ETHTOOL_GRXCLSRULE:
2323 		if (dev->features & NETIF_F_LRO)
2324 			ret = mtk_hwlro_get_fdir_entry(dev, cmd);
2325 		break;
2326 	case ETHTOOL_GRXCLSRLALL:
2327 		if (dev->features & NETIF_F_LRO)
2328 			ret = mtk_hwlro_get_fdir_all(dev, cmd,
2329 						     rule_locs);
2330 		break;
2331 	default:
2332 		break;
2333 	}
2334 
2335 	return ret;
2336 }
2337 
2338 static int mtk_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
2339 {
2340 	int ret = -EOPNOTSUPP;
2341 
2342 	switch (cmd->cmd) {
2343 	case ETHTOOL_SRXCLSRLINS:
2344 		if (dev->features & NETIF_F_LRO)
2345 			ret = mtk_hwlro_add_ipaddr(dev, cmd);
2346 		break;
2347 	case ETHTOOL_SRXCLSRLDEL:
2348 		if (dev->features & NETIF_F_LRO)
2349 			ret = mtk_hwlro_del_ipaddr(dev, cmd);
2350 		break;
2351 	default:
2352 		break;
2353 	}
2354 
2355 	return ret;
2356 }
2357 
2358 static const struct ethtool_ops mtk_ethtool_ops = {
2359 	.get_link_ksettings	= mtk_get_link_ksettings,
2360 	.set_link_ksettings	= mtk_set_link_ksettings,
2361 	.get_drvinfo		= mtk_get_drvinfo,
2362 	.get_msglevel		= mtk_get_msglevel,
2363 	.set_msglevel		= mtk_set_msglevel,
2364 	.nway_reset		= mtk_nway_reset,
2365 	.get_link		= mtk_get_link,
2366 	.get_strings		= mtk_get_strings,
2367 	.get_sset_count		= mtk_get_sset_count,
2368 	.get_ethtool_stats	= mtk_get_ethtool_stats,
2369 	.get_rxnfc		= mtk_get_rxnfc,
2370 	.set_rxnfc              = mtk_set_rxnfc,
2371 };
2372 
2373 static const struct net_device_ops mtk_netdev_ops = {
2374 	.ndo_init		= mtk_init,
2375 	.ndo_uninit		= mtk_uninit,
2376 	.ndo_open		= mtk_open,
2377 	.ndo_stop		= mtk_stop,
2378 	.ndo_start_xmit		= mtk_start_xmit,
2379 	.ndo_set_mac_address	= mtk_set_mac_address,
2380 	.ndo_validate_addr	= eth_validate_addr,
2381 	.ndo_do_ioctl		= mtk_do_ioctl,
2382 	.ndo_tx_timeout		= mtk_tx_timeout,
2383 	.ndo_get_stats64        = mtk_get_stats64,
2384 	.ndo_fix_features	= mtk_fix_features,
2385 	.ndo_set_features	= mtk_set_features,
2386 #ifdef CONFIG_NET_POLL_CONTROLLER
2387 	.ndo_poll_controller	= mtk_poll_controller,
2388 #endif
2389 };
2390 
2391 static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
2392 {
2393 	struct mtk_mac *mac;
2394 	const __be32 *_id = of_get_property(np, "reg", NULL);
2395 	int id, err;
2396 
2397 	if (!_id) {
2398 		dev_err(eth->dev, "missing mac id\n");
2399 		return -EINVAL;
2400 	}
2401 
2402 	id = be32_to_cpup(_id);
2403 	if (id >= MTK_MAC_COUNT) {
2404 		dev_err(eth->dev, "%d is not a valid mac id\n", id);
2405 		return -EINVAL;
2406 	}
2407 
2408 	if (eth->netdev[id]) {
2409 		dev_err(eth->dev, "duplicate mac id found: %d\n", id);
2410 		return -EINVAL;
2411 	}
2412 
2413 	eth->netdev[id] = alloc_etherdev(sizeof(*mac));
2414 	if (!eth->netdev[id]) {
2415 		dev_err(eth->dev, "alloc_etherdev failed\n");
2416 		return -ENOMEM;
2417 	}
2418 	mac = netdev_priv(eth->netdev[id]);
2419 	eth->mac[id] = mac;
2420 	mac->id = id;
2421 	mac->hw = eth;
2422 	mac->of_node = np;
2423 
2424 	memset(mac->hwlro_ip, 0, sizeof(mac->hwlro_ip));
2425 	mac->hwlro_ip_cnt = 0;
2426 
2427 	mac->hw_stats = devm_kzalloc(eth->dev,
2428 				     sizeof(*mac->hw_stats),
2429 				     GFP_KERNEL);
2430 	if (!mac->hw_stats) {
2431 		dev_err(eth->dev, "failed to allocate counter memory\n");
2432 		err = -ENOMEM;
2433 		goto free_netdev;
2434 	}
2435 	spin_lock_init(&mac->hw_stats->stats_lock);
2436 	u64_stats_init(&mac->hw_stats->syncp);
2437 	mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
2438 
2439 	SET_NETDEV_DEV(eth->netdev[id], eth->dev);
2440 	eth->netdev[id]->watchdog_timeo = 5 * HZ;
2441 	eth->netdev[id]->netdev_ops = &mtk_netdev_ops;
2442 	eth->netdev[id]->base_addr = (unsigned long)eth->base;
2443 
2444 	eth->netdev[id]->hw_features = MTK_HW_FEATURES;
2445 	if (eth->hwlro)
2446 		eth->netdev[id]->hw_features |= NETIF_F_LRO;
2447 
2448 	eth->netdev[id]->vlan_features = MTK_HW_FEATURES &
2449 		~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX);
2450 	eth->netdev[id]->features |= MTK_HW_FEATURES;
2451 	eth->netdev[id]->ethtool_ops = &mtk_ethtool_ops;
2452 
2453 	eth->netdev[id]->irq = eth->irq[0];
2454 	eth->netdev[id]->dev.of_node = np;
2455 
2456 	return 0;
2457 
2458 free_netdev:
2459 	free_netdev(eth->netdev[id]);
2460 	return err;
2461 }
2462 
2463 static int mtk_get_chip_id(struct mtk_eth *eth, u32 *chip_id)
2464 {
2465 	u32 val[2], id[4];
2466 
2467 	regmap_read(eth->ethsys, ETHSYS_CHIPID0_3, &val[0]);
2468 	regmap_read(eth->ethsys, ETHSYS_CHIPID4_7, &val[1]);
2469 
2470 	id[3] = ((val[0] >> 16) & 0xff) - '0';
2471 	id[2] = ((val[0] >> 24) & 0xff) - '0';
2472 	id[1] = (val[1] & 0xff) - '0';
2473 	id[0] = ((val[1] >> 8) & 0xff) - '0';
2474 
2475 	*chip_id = (id[3] * 1000) + (id[2] * 100) +
2476 		   (id[1] * 10) + id[0];
2477 
2478 	if (!(*chip_id)) {
2479 		dev_err(eth->dev, "failed to get chip id\n");
2480 		return -ENODEV;
2481 	}
2482 
2483 	dev_info(eth->dev, "chip id = %d\n", *chip_id);
2484 
2485 	return 0;
2486 }
2487 
2488 static bool mtk_is_hwlro_supported(struct mtk_eth *eth)
2489 {
2490 	switch (eth->chip_id) {
2491 	case MT7622_ETH:
2492 	case MT7623_ETH:
2493 		return true;
2494 	}
2495 
2496 	return false;
2497 }
2498 
2499 static int mtk_probe(struct platform_device *pdev)
2500 {
2501 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2502 	struct device_node *mac_np;
2503 	struct mtk_eth *eth;
2504 	int err;
2505 	int i;
2506 
2507 	eth = devm_kzalloc(&pdev->dev, sizeof(*eth), GFP_KERNEL);
2508 	if (!eth)
2509 		return -ENOMEM;
2510 
2511 	eth->soc = of_device_get_match_data(&pdev->dev);
2512 
2513 	eth->dev = &pdev->dev;
2514 	eth->base = devm_ioremap_resource(&pdev->dev, res);
2515 	if (IS_ERR(eth->base))
2516 		return PTR_ERR(eth->base);
2517 
2518 	spin_lock_init(&eth->page_lock);
2519 	spin_lock_init(&eth->tx_irq_lock);
2520 	spin_lock_init(&eth->rx_irq_lock);
2521 
2522 	eth->ethsys = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
2523 						      "mediatek,ethsys");
2524 	if (IS_ERR(eth->ethsys)) {
2525 		dev_err(&pdev->dev, "no ethsys regmap found\n");
2526 		return PTR_ERR(eth->ethsys);
2527 	}
2528 
2529 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SGMII)) {
2530 		eth->sgmiisys =
2531 		syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
2532 						"mediatek,sgmiisys");
2533 		if (IS_ERR(eth->sgmiisys)) {
2534 			dev_err(&pdev->dev, "no sgmiisys regmap found\n");
2535 			return PTR_ERR(eth->sgmiisys);
2536 		}
2537 	}
2538 
2539 	if (eth->soc->required_pctl) {
2540 		eth->pctl = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
2541 							    "mediatek,pctl");
2542 		if (IS_ERR(eth->pctl)) {
2543 			dev_err(&pdev->dev, "no pctl regmap found\n");
2544 			return PTR_ERR(eth->pctl);
2545 		}
2546 	}
2547 
2548 	for (i = 0; i < 3; i++) {
2549 		eth->irq[i] = platform_get_irq(pdev, i);
2550 		if (eth->irq[i] < 0) {
2551 			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
2552 			return -ENXIO;
2553 		}
2554 	}
2555 	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
2556 		eth->clks[i] = devm_clk_get(eth->dev,
2557 					    mtk_clks_source_name[i]);
2558 		if (IS_ERR(eth->clks[i])) {
2559 			if (PTR_ERR(eth->clks[i]) == -EPROBE_DEFER)
2560 				return -EPROBE_DEFER;
2561 			if (eth->soc->required_clks & BIT(i)) {
2562 				dev_err(&pdev->dev, "clock %s not found\n",
2563 					mtk_clks_source_name[i]);
2564 				return -EINVAL;
2565 			}
2566 			eth->clks[i] = NULL;
2567 		}
2568 	}
2569 
2570 	eth->msg_enable = netif_msg_init(mtk_msg_level, MTK_DEFAULT_MSG_ENABLE);
2571 	INIT_WORK(&eth->pending_work, mtk_pending_work);
2572 
2573 	err = mtk_hw_init(eth);
2574 	if (err)
2575 		return err;
2576 
2577 	err = mtk_get_chip_id(eth, &eth->chip_id);
2578 	if (err)
2579 		return err;
2580 
2581 	eth->hwlro = mtk_is_hwlro_supported(eth);
2582 
2583 	for_each_child_of_node(pdev->dev.of_node, mac_np) {
2584 		if (!of_device_is_compatible(mac_np,
2585 					     "mediatek,eth-mac"))
2586 			continue;
2587 
2588 		if (!of_device_is_available(mac_np))
2589 			continue;
2590 
2591 		err = mtk_add_mac(eth, mac_np);
2592 		if (err)
2593 			goto err_deinit_hw;
2594 	}
2595 
2596 	err = devm_request_irq(eth->dev, eth->irq[1], mtk_handle_irq_tx, 0,
2597 			       dev_name(eth->dev), eth);
2598 	if (err)
2599 		goto err_free_dev;
2600 
2601 	err = devm_request_irq(eth->dev, eth->irq[2], mtk_handle_irq_rx, 0,
2602 			       dev_name(eth->dev), eth);
2603 	if (err)
2604 		goto err_free_dev;
2605 
2606 	err = mtk_mdio_init(eth);
2607 	if (err)
2608 		goto err_free_dev;
2609 
2610 	for (i = 0; i < MTK_MAX_DEVS; i++) {
2611 		if (!eth->netdev[i])
2612 			continue;
2613 
2614 		err = register_netdev(eth->netdev[i]);
2615 		if (err) {
2616 			dev_err(eth->dev, "error bringing up device\n");
2617 			goto err_deinit_mdio;
2618 		} else
2619 			netif_info(eth, probe, eth->netdev[i],
2620 				   "mediatek frame engine at 0x%08lx, irq %d\n",
2621 				   eth->netdev[i]->base_addr, eth->irq[0]);
2622 	}
2623 
2624 	/* we run 2 devices on the same DMA ring so we need a dummy device
2625 	 * for NAPI to work
2626 	 */
2627 	init_dummy_netdev(&eth->dummy_dev);
2628 	netif_napi_add(&eth->dummy_dev, &eth->tx_napi, mtk_napi_tx,
2629 		       MTK_NAPI_WEIGHT);
2630 	netif_napi_add(&eth->dummy_dev, &eth->rx_napi, mtk_napi_rx,
2631 		       MTK_NAPI_WEIGHT);
2632 
2633 	platform_set_drvdata(pdev, eth);
2634 
2635 	return 0;
2636 
2637 err_deinit_mdio:
2638 	mtk_mdio_cleanup(eth);
2639 err_free_dev:
2640 	mtk_free_dev(eth);
2641 err_deinit_hw:
2642 	mtk_hw_deinit(eth);
2643 
2644 	return err;
2645 }
2646 
2647 static int mtk_remove(struct platform_device *pdev)
2648 {
2649 	struct mtk_eth *eth = platform_get_drvdata(pdev);
2650 	int i;
2651 
2652 	/* stop all devices to make sure that dma is properly shut down */
2653 	for (i = 0; i < MTK_MAC_COUNT; i++) {
2654 		if (!eth->netdev[i])
2655 			continue;
2656 		mtk_stop(eth->netdev[i]);
2657 	}
2658 
2659 	mtk_hw_deinit(eth);
2660 
2661 	netif_napi_del(&eth->tx_napi);
2662 	netif_napi_del(&eth->rx_napi);
2663 	mtk_cleanup(eth);
2664 	mtk_mdio_cleanup(eth);
2665 
2666 	return 0;
2667 }
2668 
2669 static const struct mtk_soc_data mt2701_data = {
2670 	.caps = MTK_GMAC1_TRGMII,
2671 	.required_clks = MT7623_CLKS_BITMAP,
2672 	.required_pctl = true,
2673 };
2674 
2675 static const struct mtk_soc_data mt7622_data = {
2676 	.caps = MTK_DUAL_GMAC_SHARED_SGMII | MTK_GMAC1_ESW,
2677 	.required_clks = MT7622_CLKS_BITMAP,
2678 	.required_pctl = false,
2679 };
2680 
2681 static const struct mtk_soc_data mt7623_data = {
2682 	.caps = MTK_GMAC1_TRGMII,
2683 	.required_clks = MT7623_CLKS_BITMAP,
2684 	.required_pctl = true,
2685 };
2686 
2687 const struct of_device_id of_mtk_match[] = {
2688 	{ .compatible = "mediatek,mt2701-eth", .data = &mt2701_data},
2689 	{ .compatible = "mediatek,mt7622-eth", .data = &mt7622_data},
2690 	{ .compatible = "mediatek,mt7623-eth", .data = &mt7623_data},
2691 	{},
2692 };
2693 MODULE_DEVICE_TABLE(of, of_mtk_match);
2694 
2695 static struct platform_driver mtk_driver = {
2696 	.probe = mtk_probe,
2697 	.remove = mtk_remove,
2698 	.driver = {
2699 		.name = "mtk_soc_eth",
2700 		.of_match_table = of_mtk_match,
2701 	},
2702 };
2703 
2704 module_platform_driver(mtk_driver);
2705 
2706 MODULE_LICENSE("GPL");
2707 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
2708 MODULE_DESCRIPTION("Ethernet driver for MediaTek SoC");
2709