1 // SPDX-License-Identifier: GPL-2.0
2 /* Ethernet device driver for Cortina Systems Gemini SoC
3  * Also known as the StorLink SL3512 and SL3516 (SL351x) or Lepus
4  * Net Engine and Gigabit Ethernet MAC (GMAC)
5  * This hardware contains a TCP Offload Engine (TOE) but currently the
6  * driver does not make use of it.
7  *
8  * Authors:
9  * Linus Walleij <linus.walleij@linaro.org>
10  * Tobias Waldvogel <tobias.waldvogel@gmail.com> (OpenWRT)
11  * Michał Mirosław <mirq-linux@rere.qmqm.pl>
12  * Paulius Zaleckas <paulius.zaleckas@gmail.com>
13  * Giuseppe De Robertis <Giuseppe.DeRobertis@ba.infn.it>
14  * Gary Chen & Ch Hsu Storlink Semiconductor
15  */
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/cache.h>
24 #include <linux/interrupt.h>
25 #include <linux/reset.h>
26 #include <linux/clk.h>
27 #include <linux/of.h>
28 #include <linux/of_mdio.h>
29 #include <linux/of_net.h>
30 #include <linux/of_platform.h>
31 #include <linux/etherdevice.h>
32 #include <linux/if_vlan.h>
33 #include <linux/skbuff.h>
34 #include <linux/phy.h>
35 #include <linux/crc32.h>
36 #include <linux/ethtool.h>
37 #include <linux/tcp.h>
38 #include <linux/u64_stats_sync.h>
39 
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 
44 #include "gemini.h"
45 
46 #define DRV_NAME		"gmac-gemini"
47 
48 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
49 static int debug = -1;
50 module_param(debug, int, 0);
51 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
52 
53 #define HSIZE_8			0x00
54 #define HSIZE_16		0x01
55 #define HSIZE_32		0x02
56 
57 #define HBURST_SINGLE		0x00
58 #define HBURST_INCR		0x01
59 #define HBURST_INCR4		0x02
60 #define HBURST_INCR8		0x03
61 
62 #define HPROT_DATA_CACHE	BIT(0)
63 #define HPROT_PRIVILIGED	BIT(1)
64 #define HPROT_BUFFERABLE	BIT(2)
65 #define HPROT_CACHABLE		BIT(3)
66 
67 #define DEFAULT_RX_COALESCE_NSECS	0
68 #define DEFAULT_GMAC_RXQ_ORDER		9
69 #define DEFAULT_GMAC_TXQ_ORDER		8
70 #define DEFAULT_RX_BUF_ORDER		11
71 #define DEFAULT_NAPI_WEIGHT		64
72 #define TX_MAX_FRAGS			16
73 #define TX_QUEUE_NUM			1	/* max: 6 */
74 #define RX_MAX_ALLOC_ORDER		2
75 
76 #define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
77 		      GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
78 #define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
79 			      GMAC0_SWTQ00_FIN_INT_BIT)
80 #define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
81 
82 #define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
83 		NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
84 		NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
85 
86 /**
87  * struct gmac_queue_page - page buffer per-page info
88  */
89 struct gmac_queue_page {
90 	struct page *page;
91 	dma_addr_t mapping;
92 };
93 
94 struct gmac_txq {
95 	struct gmac_txdesc *ring;
96 	struct sk_buff	**skb;
97 	unsigned int	cptr;
98 	unsigned int	noirq_packets;
99 };
100 
101 struct gemini_ethernet;
102 
103 struct gemini_ethernet_port {
104 	u8 id; /* 0 or 1 */
105 
106 	struct gemini_ethernet *geth;
107 	struct net_device *netdev;
108 	struct device *dev;
109 	void __iomem *dma_base;
110 	void __iomem *gmac_base;
111 	struct clk *pclk;
112 	struct reset_control *reset;
113 	int irq;
114 	__le32 mac_addr[3];
115 
116 	void __iomem		*rxq_rwptr;
117 	struct gmac_rxdesc	*rxq_ring;
118 	unsigned int		rxq_order;
119 
120 	struct napi_struct	napi;
121 	struct hrtimer		rx_coalesce_timer;
122 	unsigned int		rx_coalesce_nsecs;
123 	unsigned int		freeq_refill;
124 	struct gmac_txq		txq[TX_QUEUE_NUM];
125 	unsigned int		txq_order;
126 	unsigned int		irq_every_tx_packets;
127 
128 	dma_addr_t		rxq_dma_base;
129 	dma_addr_t		txq_dma_base;
130 
131 	unsigned int		msg_enable;
132 	spinlock_t		config_lock; /* Locks config register */
133 
134 	struct u64_stats_sync	tx_stats_syncp;
135 	struct u64_stats_sync	rx_stats_syncp;
136 	struct u64_stats_sync	ir_stats_syncp;
137 
138 	struct rtnl_link_stats64 stats;
139 	u64			hw_stats[RX_STATS_NUM];
140 	u64			rx_stats[RX_STATUS_NUM];
141 	u64			rx_csum_stats[RX_CHKSUM_NUM];
142 	u64			rx_napi_exits;
143 	u64			tx_frag_stats[TX_MAX_FRAGS];
144 	u64			tx_frags_linearized;
145 	u64			tx_hw_csummed;
146 };
147 
148 struct gemini_ethernet {
149 	struct device *dev;
150 	void __iomem *base;
151 	struct gemini_ethernet_port *port0;
152 	struct gemini_ethernet_port *port1;
153 	bool initialized;
154 
155 	spinlock_t	irq_lock; /* Locks IRQ-related registers */
156 	unsigned int	freeq_order;
157 	unsigned int	freeq_frag_order;
158 	struct gmac_rxdesc *freeq_ring;
159 	dma_addr_t	freeq_dma_base;
160 	struct gmac_queue_page	*freeq_pages;
161 	unsigned int	num_freeq_pages;
162 	spinlock_t	freeq_lock; /* Locks queue from reentrance */
163 };
164 
165 #define GMAC_STATS_NUM	( \
166 	RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \
167 	TX_MAX_FRAGS + 2)
168 
169 static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = {
170 	"GMAC_IN_DISCARDS",
171 	"GMAC_IN_ERRORS",
172 	"GMAC_IN_MCAST",
173 	"GMAC_IN_BCAST",
174 	"GMAC_IN_MAC1",
175 	"GMAC_IN_MAC2",
176 	"RX_STATUS_GOOD_FRAME",
177 	"RX_STATUS_TOO_LONG_GOOD_CRC",
178 	"RX_STATUS_RUNT_FRAME",
179 	"RX_STATUS_SFD_NOT_FOUND",
180 	"RX_STATUS_CRC_ERROR",
181 	"RX_STATUS_TOO_LONG_BAD_CRC",
182 	"RX_STATUS_ALIGNMENT_ERROR",
183 	"RX_STATUS_TOO_LONG_BAD_ALIGN",
184 	"RX_STATUS_RX_ERR",
185 	"RX_STATUS_DA_FILTERED",
186 	"RX_STATUS_BUFFER_FULL",
187 	"RX_STATUS_11",
188 	"RX_STATUS_12",
189 	"RX_STATUS_13",
190 	"RX_STATUS_14",
191 	"RX_STATUS_15",
192 	"RX_CHKSUM_IP_UDP_TCP_OK",
193 	"RX_CHKSUM_IP_OK_ONLY",
194 	"RX_CHKSUM_NONE",
195 	"RX_CHKSUM_3",
196 	"RX_CHKSUM_IP_ERR_UNKNOWN",
197 	"RX_CHKSUM_IP_ERR",
198 	"RX_CHKSUM_TCP_UDP_ERR",
199 	"RX_CHKSUM_7",
200 	"RX_NAPI_EXITS",
201 	"TX_FRAGS[1]",
202 	"TX_FRAGS[2]",
203 	"TX_FRAGS[3]",
204 	"TX_FRAGS[4]",
205 	"TX_FRAGS[5]",
206 	"TX_FRAGS[6]",
207 	"TX_FRAGS[7]",
208 	"TX_FRAGS[8]",
209 	"TX_FRAGS[9]",
210 	"TX_FRAGS[10]",
211 	"TX_FRAGS[11]",
212 	"TX_FRAGS[12]",
213 	"TX_FRAGS[13]",
214 	"TX_FRAGS[14]",
215 	"TX_FRAGS[15]",
216 	"TX_FRAGS[16+]",
217 	"TX_FRAGS_LINEARIZED",
218 	"TX_HW_CSUMMED",
219 };
220 
221 static void gmac_dump_dma_state(struct net_device *netdev);
222 
223 static void gmac_update_config0_reg(struct net_device *netdev,
224 				    u32 val, u32 vmask)
225 {
226 	struct gemini_ethernet_port *port = netdev_priv(netdev);
227 	unsigned long flags;
228 	u32 reg;
229 
230 	spin_lock_irqsave(&port->config_lock, flags);
231 
232 	reg = readl(port->gmac_base + GMAC_CONFIG0);
233 	reg = (reg & ~vmask) | val;
234 	writel(reg, port->gmac_base + GMAC_CONFIG0);
235 
236 	spin_unlock_irqrestore(&port->config_lock, flags);
237 }
238 
239 static void gmac_enable_tx_rx(struct net_device *netdev)
240 {
241 	struct gemini_ethernet_port *port = netdev_priv(netdev);
242 	unsigned long flags;
243 	u32 reg;
244 
245 	spin_lock_irqsave(&port->config_lock, flags);
246 
247 	reg = readl(port->gmac_base + GMAC_CONFIG0);
248 	reg &= ~CONFIG0_TX_RX_DISABLE;
249 	writel(reg, port->gmac_base + GMAC_CONFIG0);
250 
251 	spin_unlock_irqrestore(&port->config_lock, flags);
252 }
253 
254 static void gmac_disable_tx_rx(struct net_device *netdev)
255 {
256 	struct gemini_ethernet_port *port = netdev_priv(netdev);
257 	unsigned long flags;
258 	u32 val;
259 
260 	spin_lock_irqsave(&port->config_lock, flags);
261 
262 	val = readl(port->gmac_base + GMAC_CONFIG0);
263 	val |= CONFIG0_TX_RX_DISABLE;
264 	writel(val, port->gmac_base + GMAC_CONFIG0);
265 
266 	spin_unlock_irqrestore(&port->config_lock, flags);
267 
268 	mdelay(10);	/* let GMAC consume packet */
269 }
270 
271 static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx)
272 {
273 	struct gemini_ethernet_port *port = netdev_priv(netdev);
274 	unsigned long flags;
275 	u32 val;
276 
277 	spin_lock_irqsave(&port->config_lock, flags);
278 
279 	val = readl(port->gmac_base + GMAC_CONFIG0);
280 	val &= ~CONFIG0_FLOW_CTL;
281 	if (tx)
282 		val |= CONFIG0_FLOW_TX;
283 	if (rx)
284 		val |= CONFIG0_FLOW_RX;
285 	writel(val, port->gmac_base + GMAC_CONFIG0);
286 
287 	spin_unlock_irqrestore(&port->config_lock, flags);
288 }
289 
290 static void gmac_speed_set(struct net_device *netdev)
291 {
292 	struct gemini_ethernet_port *port = netdev_priv(netdev);
293 	struct phy_device *phydev = netdev->phydev;
294 	union gmac_status status, old_status;
295 	int pause_tx = 0;
296 	int pause_rx = 0;
297 
298 	status.bits32 = readl(port->gmac_base + GMAC_STATUS);
299 	old_status.bits32 = status.bits32;
300 	status.bits.link = phydev->link;
301 	status.bits.duplex = phydev->duplex;
302 
303 	switch (phydev->speed) {
304 	case 1000:
305 		status.bits.speed = GMAC_SPEED_1000;
306 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
307 			status.bits.mii_rmii = GMAC_PHY_RGMII_1000;
308 		netdev_dbg(netdev, "connect %s to RGMII @ 1Gbit\n",
309 			   phydev_name(phydev));
310 		break;
311 	case 100:
312 		status.bits.speed = GMAC_SPEED_100;
313 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
314 			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
315 		netdev_dbg(netdev, "connect %s to RGMII @ 100 Mbit\n",
316 			   phydev_name(phydev));
317 		break;
318 	case 10:
319 		status.bits.speed = GMAC_SPEED_10;
320 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
321 			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
322 		netdev_dbg(netdev, "connect %s to RGMII @ 10 Mbit\n",
323 			   phydev_name(phydev));
324 		break;
325 	default:
326 		netdev_warn(netdev, "Unsupported PHY speed (%d) on %s\n",
327 			    phydev->speed, phydev_name(phydev));
328 	}
329 
330 	if (phydev->duplex == DUPLEX_FULL) {
331 		u16 lcladv = phy_read(phydev, MII_ADVERTISE);
332 		u16 rmtadv = phy_read(phydev, MII_LPA);
333 		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
334 
335 		if (cap & FLOW_CTRL_RX)
336 			pause_rx = 1;
337 		if (cap & FLOW_CTRL_TX)
338 			pause_tx = 1;
339 	}
340 
341 	gmac_set_flow_control(netdev, pause_tx, pause_rx);
342 
343 	if (old_status.bits32 == status.bits32)
344 		return;
345 
346 	if (netif_msg_link(port)) {
347 		phy_print_status(phydev);
348 		netdev_info(netdev, "link flow control: %s\n",
349 			    phydev->pause
350 			    ? (phydev->asym_pause ? "tx" : "both")
351 			    : (phydev->asym_pause ? "rx" : "none")
352 		);
353 	}
354 
355 	gmac_disable_tx_rx(netdev);
356 	writel(status.bits32, port->gmac_base + GMAC_STATUS);
357 	gmac_enable_tx_rx(netdev);
358 }
359 
360 static int gmac_setup_phy(struct net_device *netdev)
361 {
362 	struct gemini_ethernet_port *port = netdev_priv(netdev);
363 	union gmac_status status = { .bits32 = 0 };
364 	struct device *dev = port->dev;
365 	struct phy_device *phy;
366 
367 	phy = of_phy_get_and_connect(netdev,
368 				     dev->of_node,
369 				     gmac_speed_set);
370 	if (!phy)
371 		return -ENODEV;
372 	netdev->phydev = phy;
373 
374 	phy_set_max_speed(phy, SPEED_1000);
375 	phy_support_asym_pause(phy);
376 
377 	/* set PHY interface type */
378 	switch (phy->interface) {
379 	case PHY_INTERFACE_MODE_MII:
380 		netdev_dbg(netdev,
381 			   "MII: set GMAC0 to GMII mode, GMAC1 disabled\n");
382 		status.bits.mii_rmii = GMAC_PHY_MII;
383 		break;
384 	case PHY_INTERFACE_MODE_GMII:
385 		netdev_dbg(netdev,
386 			   "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n");
387 		status.bits.mii_rmii = GMAC_PHY_GMII;
388 		break;
389 	case PHY_INTERFACE_MODE_RGMII:
390 		netdev_dbg(netdev,
391 			   "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n");
392 		status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
393 		break;
394 	default:
395 		netdev_err(netdev, "Unsupported MII interface\n");
396 		phy_disconnect(phy);
397 		netdev->phydev = NULL;
398 		return -EINVAL;
399 	}
400 	writel(status.bits32, port->gmac_base + GMAC_STATUS);
401 
402 	if (netif_msg_link(port))
403 		phy_attached_info(phy);
404 
405 	return 0;
406 }
407 
408 /* The maximum frame length is not logically enumerated in the
409  * hardware, so we do a table lookup to find the applicable max
410  * frame length.
411  */
412 struct gmac_max_framelen {
413 	unsigned int max_l3_len;
414 	u8 val;
415 };
416 
417 static const struct gmac_max_framelen gmac_maxlens[] = {
418 	{
419 		.max_l3_len = 1518,
420 		.val = CONFIG0_MAXLEN_1518,
421 	},
422 	{
423 		.max_l3_len = 1522,
424 		.val = CONFIG0_MAXLEN_1522,
425 	},
426 	{
427 		.max_l3_len = 1536,
428 		.val = CONFIG0_MAXLEN_1536,
429 	},
430 	{
431 		.max_l3_len = 1542,
432 		.val = CONFIG0_MAXLEN_1542,
433 	},
434 	{
435 		.max_l3_len = 9212,
436 		.val = CONFIG0_MAXLEN_9k,
437 	},
438 	{
439 		.max_l3_len = 10236,
440 		.val = CONFIG0_MAXLEN_10k,
441 	},
442 };
443 
444 static int gmac_pick_rx_max_len(unsigned int max_l3_len)
445 {
446 	const struct gmac_max_framelen *maxlen;
447 	int maxtot;
448 	int i;
449 
450 	maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN;
451 
452 	for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) {
453 		maxlen = &gmac_maxlens[i];
454 		if (maxtot <= maxlen->max_l3_len)
455 			return maxlen->val;
456 	}
457 
458 	return -1;
459 }
460 
461 static int gmac_init(struct net_device *netdev)
462 {
463 	struct gemini_ethernet_port *port = netdev_priv(netdev);
464 	union gmac_config0 config0 = { .bits = {
465 		.dis_tx = 1,
466 		.dis_rx = 1,
467 		.ipv4_rx_chksum = 1,
468 		.ipv6_rx_chksum = 1,
469 		.rx_err_detect = 1,
470 		.rgmm_edge = 1,
471 		.port0_chk_hwq = 1,
472 		.port1_chk_hwq = 1,
473 		.port0_chk_toeq = 1,
474 		.port1_chk_toeq = 1,
475 		.port0_chk_classq = 1,
476 		.port1_chk_classq = 1,
477 	} };
478 	union gmac_ahb_weight ahb_weight = { .bits = {
479 		.rx_weight = 1,
480 		.tx_weight = 1,
481 		.hash_weight = 1,
482 		.pre_req = 0x1f,
483 		.tq_dv_threshold = 0,
484 	} };
485 	union gmac_tx_wcr0 hw_weigh = { .bits = {
486 		.hw_tq3 = 1,
487 		.hw_tq2 = 1,
488 		.hw_tq1 = 1,
489 		.hw_tq0 = 1,
490 	} };
491 	union gmac_tx_wcr1 sw_weigh = { .bits = {
492 		.sw_tq5 = 1,
493 		.sw_tq4 = 1,
494 		.sw_tq3 = 1,
495 		.sw_tq2 = 1,
496 		.sw_tq1 = 1,
497 		.sw_tq0 = 1,
498 	} };
499 	union gmac_config1 config1 = { .bits = {
500 		.set_threshold = 16,
501 		.rel_threshold = 24,
502 	} };
503 	union gmac_config2 config2 = { .bits = {
504 		.set_threshold = 16,
505 		.rel_threshold = 32,
506 	} };
507 	union gmac_config3 config3 = { .bits = {
508 		.set_threshold = 0,
509 		.rel_threshold = 0,
510 	} };
511 	union gmac_config0 tmp;
512 	u32 val;
513 
514 	config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
515 	tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
516 	config0.bits.reserved = tmp.bits.reserved;
517 	writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
518 	writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
519 	writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
520 	writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
521 
522 	val = readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
523 	writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
524 
525 	writel(hw_weigh.bits32,
526 	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
527 	writel(sw_weigh.bits32,
528 	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
529 
530 	port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
531 	port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
532 	port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
533 
534 	/* Mark every quarter of the queue a packet for interrupt
535 	 * in order to be able to wake up the queue if it was stopped
536 	 */
537 	port->irq_every_tx_packets = 1 << (port->txq_order - 2);
538 
539 	return 0;
540 }
541 
542 static void gmac_uninit(struct net_device *netdev)
543 {
544 	if (netdev->phydev)
545 		phy_disconnect(netdev->phydev);
546 }
547 
548 static int gmac_setup_txqs(struct net_device *netdev)
549 {
550 	struct gemini_ethernet_port *port = netdev_priv(netdev);
551 	unsigned int n_txq = netdev->num_tx_queues;
552 	struct gemini_ethernet *geth = port->geth;
553 	size_t entries = 1 << port->txq_order;
554 	struct gmac_txq *txq = port->txq;
555 	struct gmac_txdesc *desc_ring;
556 	size_t len = n_txq * entries;
557 	struct sk_buff **skb_tab;
558 	void __iomem *rwptr_reg;
559 	unsigned int r;
560 	int i;
561 
562 	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
563 
564 	skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
565 	if (!skb_tab)
566 		return -ENOMEM;
567 
568 	desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
569 				       &port->txq_dma_base, GFP_KERNEL);
570 
571 	if (!desc_ring) {
572 		kfree(skb_tab);
573 		return -ENOMEM;
574 	}
575 
576 	if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
577 		dev_warn(geth->dev, "TX queue base is not aligned\n");
578 		dma_free_coherent(geth->dev, len * sizeof(*desc_ring),
579 				  desc_ring, port->txq_dma_base);
580 		kfree(skb_tab);
581 		return -ENOMEM;
582 	}
583 
584 	writel(port->txq_dma_base | port->txq_order,
585 	       port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
586 
587 	for (i = 0; i < n_txq; i++) {
588 		txq->ring = desc_ring;
589 		txq->skb = skb_tab;
590 		txq->noirq_packets = 0;
591 
592 		r = readw(rwptr_reg);
593 		rwptr_reg += 2;
594 		writew(r, rwptr_reg);
595 		rwptr_reg += 2;
596 		txq->cptr = r;
597 
598 		txq++;
599 		desc_ring += entries;
600 		skb_tab += entries;
601 	}
602 
603 	return 0;
604 }
605 
606 static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
607 			   unsigned int r)
608 {
609 	struct gemini_ethernet_port *port = netdev_priv(netdev);
610 	unsigned int m = (1 << port->txq_order) - 1;
611 	struct gemini_ethernet *geth = port->geth;
612 	unsigned int c = txq->cptr;
613 	union gmac_txdesc_0 word0;
614 	union gmac_txdesc_1 word1;
615 	unsigned int hwchksum = 0;
616 	unsigned long bytes = 0;
617 	struct gmac_txdesc *txd;
618 	unsigned short nfrags;
619 	unsigned int errs = 0;
620 	unsigned int pkts = 0;
621 	unsigned int word3;
622 	dma_addr_t mapping;
623 
624 	if (c == r)
625 		return;
626 
627 	while (c != r) {
628 		txd = txq->ring + c;
629 		word0 = txd->word0;
630 		word1 = txd->word1;
631 		mapping = txd->word2.buf_adr;
632 		word3 = txd->word3.bits32;
633 
634 		dma_unmap_single(geth->dev, mapping,
635 				 word0.bits.buffer_size, DMA_TO_DEVICE);
636 
637 		if (word3 & EOF_BIT)
638 			dev_kfree_skb(txq->skb[c]);
639 
640 		c++;
641 		c &= m;
642 
643 		if (!(word3 & SOF_BIT))
644 			continue;
645 
646 		if (!word0.bits.status_tx_ok) {
647 			errs++;
648 			continue;
649 		}
650 
651 		pkts++;
652 		bytes += txd->word1.bits.byte_count;
653 
654 		if (word1.bits32 & TSS_CHECKUM_ENABLE)
655 			hwchksum++;
656 
657 		nfrags = word0.bits.desc_count - 1;
658 		if (nfrags) {
659 			if (nfrags >= TX_MAX_FRAGS)
660 				nfrags = TX_MAX_FRAGS - 1;
661 
662 			u64_stats_update_begin(&port->tx_stats_syncp);
663 			port->tx_frag_stats[nfrags]++;
664 			u64_stats_update_end(&port->tx_stats_syncp);
665 		}
666 	}
667 
668 	u64_stats_update_begin(&port->ir_stats_syncp);
669 	port->stats.tx_errors += errs;
670 	port->stats.tx_packets += pkts;
671 	port->stats.tx_bytes += bytes;
672 	port->tx_hw_csummed += hwchksum;
673 	u64_stats_update_end(&port->ir_stats_syncp);
674 
675 	txq->cptr = c;
676 }
677 
678 static void gmac_cleanup_txqs(struct net_device *netdev)
679 {
680 	struct gemini_ethernet_port *port = netdev_priv(netdev);
681 	unsigned int n_txq = netdev->num_tx_queues;
682 	struct gemini_ethernet *geth = port->geth;
683 	void __iomem *rwptr_reg;
684 	unsigned int r, i;
685 
686 	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
687 
688 	for (i = 0; i < n_txq; i++) {
689 		r = readw(rwptr_reg);
690 		rwptr_reg += 2;
691 		writew(r, rwptr_reg);
692 		rwptr_reg += 2;
693 
694 		gmac_clean_txq(netdev, port->txq + i, r);
695 	}
696 	writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
697 
698 	kfree(port->txq->skb);
699 	dma_free_coherent(geth->dev,
700 			  n_txq * sizeof(*port->txq->ring) << port->txq_order,
701 			  port->txq->ring, port->txq_dma_base);
702 }
703 
704 static int gmac_setup_rxq(struct net_device *netdev)
705 {
706 	struct gemini_ethernet_port *port = netdev_priv(netdev);
707 	struct gemini_ethernet *geth = port->geth;
708 	struct nontoe_qhdr __iomem *qhdr;
709 
710 	qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
711 	port->rxq_rwptr = &qhdr->word1;
712 
713 	/* Remap a slew of memory to use for the RX queue */
714 	port->rxq_ring = dma_alloc_coherent(geth->dev,
715 				sizeof(*port->rxq_ring) << port->rxq_order,
716 				&port->rxq_dma_base, GFP_KERNEL);
717 	if (!port->rxq_ring)
718 		return -ENOMEM;
719 	if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
720 		dev_warn(geth->dev, "RX queue base is not aligned\n");
721 		return -ENOMEM;
722 	}
723 
724 	writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
725 	writel(0, port->rxq_rwptr);
726 	return 0;
727 }
728 
729 static struct gmac_queue_page *
730 gmac_get_queue_page(struct gemini_ethernet *geth,
731 		    struct gemini_ethernet_port *port,
732 		    dma_addr_t addr)
733 {
734 	struct gmac_queue_page *gpage;
735 	dma_addr_t mapping;
736 	int i;
737 
738 	/* Only look for even pages */
739 	mapping = addr & PAGE_MASK;
740 
741 	if (!geth->freeq_pages) {
742 		dev_err(geth->dev, "try to get page with no page list\n");
743 		return NULL;
744 	}
745 
746 	/* Look up a ring buffer page from virtual mapping */
747 	for (i = 0; i < geth->num_freeq_pages; i++) {
748 		gpage = &geth->freeq_pages[i];
749 		if (gpage->mapping == mapping)
750 			return gpage;
751 	}
752 
753 	return NULL;
754 }
755 
756 static void gmac_cleanup_rxq(struct net_device *netdev)
757 {
758 	struct gemini_ethernet_port *port = netdev_priv(netdev);
759 	struct gemini_ethernet *geth = port->geth;
760 	struct gmac_rxdesc *rxd = port->rxq_ring;
761 	static struct gmac_queue_page *gpage;
762 	struct nontoe_qhdr __iomem *qhdr;
763 	void __iomem *dma_reg;
764 	void __iomem *ptr_reg;
765 	dma_addr_t mapping;
766 	union dma_rwptr rw;
767 	unsigned int r, w;
768 
769 	qhdr = geth->base +
770 		TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
771 	dma_reg = &qhdr->word0;
772 	ptr_reg = &qhdr->word1;
773 
774 	rw.bits32 = readl(ptr_reg);
775 	r = rw.bits.rptr;
776 	w = rw.bits.wptr;
777 	writew(r, ptr_reg + 2);
778 
779 	writel(0, dma_reg);
780 
781 	/* Loop from read pointer to write pointer of the RX queue
782 	 * and free up all pages by the queue.
783 	 */
784 	while (r != w) {
785 		mapping = rxd[r].word2.buf_adr;
786 		r++;
787 		r &= ((1 << port->rxq_order) - 1);
788 
789 		if (!mapping)
790 			continue;
791 
792 		/* Freeq pointers are one page off */
793 		gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
794 		if (!gpage) {
795 			dev_err(geth->dev, "could not find page\n");
796 			continue;
797 		}
798 		/* Release the RX queue reference to the page */
799 		put_page(gpage->page);
800 	}
801 
802 	dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
803 			  port->rxq_ring, port->rxq_dma_base);
804 }
805 
806 static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
807 					      int pn)
808 {
809 	struct gmac_rxdesc *freeq_entry;
810 	struct gmac_queue_page *gpage;
811 	unsigned int fpp_order;
812 	unsigned int frag_len;
813 	dma_addr_t mapping;
814 	struct page *page;
815 	int i;
816 
817 	/* First allocate and DMA map a single page */
818 	page = alloc_page(GFP_ATOMIC);
819 	if (!page)
820 		return NULL;
821 
822 	mapping = dma_map_single(geth->dev, page_address(page),
823 				 PAGE_SIZE, DMA_FROM_DEVICE);
824 	if (dma_mapping_error(geth->dev, mapping)) {
825 		put_page(page);
826 		return NULL;
827 	}
828 
829 	/* The assign the page mapping (physical address) to the buffer address
830 	 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
831 	 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
832 	 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
833 	 * each page normally needs two entries in the queue.
834 	 */
835 	frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
836 	fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
837 	freeq_entry = geth->freeq_ring + (pn << fpp_order);
838 	dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
839 		 pn, frag_len, (1 << fpp_order), freeq_entry);
840 	for (i = (1 << fpp_order); i > 0; i--) {
841 		freeq_entry->word2.buf_adr = mapping;
842 		freeq_entry++;
843 		mapping += frag_len;
844 	}
845 
846 	/* If the freeq entry already has a page mapped, then unmap it. */
847 	gpage = &geth->freeq_pages[pn];
848 	if (gpage->page) {
849 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
850 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
851 		/* This should be the last reference to the page so it gets
852 		 * released
853 		 */
854 		put_page(gpage->page);
855 	}
856 
857 	/* Then put our new mapping into the page table */
858 	dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
859 		pn, (unsigned int)mapping, page);
860 	gpage->mapping = mapping;
861 	gpage->page = page;
862 
863 	return page;
864 }
865 
866 /**
867  * geth_fill_freeq() - Fill the freeq with empty fragments to use
868  * @geth: the ethernet adapter
869  * @refill: whether to reset the queue by filling in all freeq entries or
870  * just refill it, usually the interrupt to refill the queue happens when
871  * the queue is half empty.
872  */
873 static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
874 {
875 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
876 	unsigned int count = 0;
877 	unsigned int pn, epn;
878 	unsigned long flags;
879 	union dma_rwptr rw;
880 	unsigned int m_pn;
881 
882 	/* Mask for page */
883 	m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
884 
885 	spin_lock_irqsave(&geth->freeq_lock, flags);
886 
887 	rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
888 	pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
889 	epn = (rw.bits.rptr >> fpp_order) - 1;
890 	epn &= m_pn;
891 
892 	/* Loop over the freeq ring buffer entries */
893 	while (pn != epn) {
894 		struct gmac_queue_page *gpage;
895 		struct page *page;
896 
897 		gpage = &geth->freeq_pages[pn];
898 		page = gpage->page;
899 
900 		dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
901 			pn, page_ref_count(page), 1 << fpp_order);
902 
903 		if (page_ref_count(page) > 1) {
904 			unsigned int fl = (pn - epn) & m_pn;
905 
906 			if (fl > 64 >> fpp_order)
907 				break;
908 
909 			page = geth_freeq_alloc_map_page(geth, pn);
910 			if (!page)
911 				break;
912 		}
913 
914 		/* Add one reference per fragment in the page */
915 		page_ref_add(page, 1 << fpp_order);
916 		count += 1 << fpp_order;
917 		pn++;
918 		pn &= m_pn;
919 	}
920 
921 	writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
922 
923 	spin_unlock_irqrestore(&geth->freeq_lock, flags);
924 
925 	return count;
926 }
927 
928 static int geth_setup_freeq(struct gemini_ethernet *geth)
929 {
930 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
931 	unsigned int frag_len = 1 << geth->freeq_frag_order;
932 	unsigned int len = 1 << geth->freeq_order;
933 	unsigned int pages = len >> fpp_order;
934 	union queue_threshold qt;
935 	union dma_skb_size skbsz;
936 	unsigned int filled;
937 	unsigned int pn;
938 
939 	geth->freeq_ring = dma_alloc_coherent(geth->dev,
940 		sizeof(*geth->freeq_ring) << geth->freeq_order,
941 		&geth->freeq_dma_base, GFP_KERNEL);
942 	if (!geth->freeq_ring)
943 		return -ENOMEM;
944 	if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
945 		dev_warn(geth->dev, "queue ring base is not aligned\n");
946 		goto err_freeq;
947 	}
948 
949 	/* Allocate a mapping to page look-up index */
950 	geth->freeq_pages = kcalloc(pages, sizeof(*geth->freeq_pages),
951 				    GFP_KERNEL);
952 	if (!geth->freeq_pages)
953 		goto err_freeq;
954 	geth->num_freeq_pages = pages;
955 
956 	dev_info(geth->dev, "allocate %d pages for queue\n", pages);
957 	for (pn = 0; pn < pages; pn++)
958 		if (!geth_freeq_alloc_map_page(geth, pn))
959 			goto err_freeq_alloc;
960 
961 	filled = geth_fill_freeq(geth, false);
962 	if (!filled)
963 		goto err_freeq_alloc;
964 
965 	qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
966 	qt.bits.swfq_empty = 32;
967 	writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
968 
969 	skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
970 	writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
971 	writel(geth->freeq_dma_base | geth->freeq_order,
972 	       geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
973 
974 	return 0;
975 
976 err_freeq_alloc:
977 	while (pn > 0) {
978 		struct gmac_queue_page *gpage;
979 		dma_addr_t mapping;
980 
981 		--pn;
982 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
983 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
984 		gpage = &geth->freeq_pages[pn];
985 		put_page(gpage->page);
986 	}
987 
988 	kfree(geth->freeq_pages);
989 err_freeq:
990 	dma_free_coherent(geth->dev,
991 			  sizeof(*geth->freeq_ring) << geth->freeq_order,
992 			  geth->freeq_ring, geth->freeq_dma_base);
993 	geth->freeq_ring = NULL;
994 	return -ENOMEM;
995 }
996 
997 /**
998  * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
999  * @geth: the Gemini global ethernet state
1000  */
1001 static void geth_cleanup_freeq(struct gemini_ethernet *geth)
1002 {
1003 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
1004 	unsigned int frag_len = 1 << geth->freeq_frag_order;
1005 	unsigned int len = 1 << geth->freeq_order;
1006 	unsigned int pages = len >> fpp_order;
1007 	unsigned int pn;
1008 
1009 	writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
1010 	       geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
1011 	writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
1012 
1013 	for (pn = 0; pn < pages; pn++) {
1014 		struct gmac_queue_page *gpage;
1015 		dma_addr_t mapping;
1016 
1017 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
1018 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
1019 
1020 		gpage = &geth->freeq_pages[pn];
1021 		while (page_ref_count(gpage->page) > 0)
1022 			put_page(gpage->page);
1023 	}
1024 
1025 	kfree(geth->freeq_pages);
1026 
1027 	dma_free_coherent(geth->dev,
1028 			  sizeof(*geth->freeq_ring) << geth->freeq_order,
1029 			  geth->freeq_ring, geth->freeq_dma_base);
1030 }
1031 
1032 /**
1033  * geth_resize_freeq() - resize the software queue depth
1034  * @port: the port requesting the change
1035  *
1036  * This gets called at least once during probe() so the device queue gets
1037  * "resized" from the hardware defaults. Since both ports/net devices share
1038  * the same hardware queue, some synchronization between the ports is
1039  * needed.
1040  */
1041 static int geth_resize_freeq(struct gemini_ethernet_port *port)
1042 {
1043 	struct gemini_ethernet *geth = port->geth;
1044 	struct net_device *netdev = port->netdev;
1045 	struct gemini_ethernet_port *other_port;
1046 	struct net_device *other_netdev;
1047 	unsigned int new_size = 0;
1048 	unsigned int new_order;
1049 	unsigned long flags;
1050 	u32 en;
1051 	int ret;
1052 
1053 	if (netdev->dev_id == 0)
1054 		other_netdev = geth->port1->netdev;
1055 	else
1056 		other_netdev = geth->port0->netdev;
1057 
1058 	if (other_netdev && netif_running(other_netdev))
1059 		return -EBUSY;
1060 
1061 	new_size = 1 << (port->rxq_order + 1);
1062 	netdev_dbg(netdev, "port %d size: %d order %d\n",
1063 		   netdev->dev_id,
1064 		   new_size,
1065 		   port->rxq_order);
1066 	if (other_netdev) {
1067 		other_port = netdev_priv(other_netdev);
1068 		new_size += 1 << (other_port->rxq_order + 1);
1069 		netdev_dbg(other_netdev, "port %d size: %d order %d\n",
1070 			   other_netdev->dev_id,
1071 			   (1 << (other_port->rxq_order + 1)),
1072 			   other_port->rxq_order);
1073 	}
1074 
1075 	new_order = min(15, ilog2(new_size - 1) + 1);
1076 	dev_dbg(geth->dev, "set shared queue to size %d order %d\n",
1077 		new_size, new_order);
1078 	if (geth->freeq_order == new_order)
1079 		return 0;
1080 
1081 	spin_lock_irqsave(&geth->irq_lock, flags);
1082 
1083 	/* Disable the software queue IRQs */
1084 	en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1085 	en &= ~SWFQ_EMPTY_INT_BIT;
1086 	writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1087 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1088 
1089 	/* Drop the old queue */
1090 	if (geth->freeq_ring)
1091 		geth_cleanup_freeq(geth);
1092 
1093 	/* Allocate a new queue with the desired order */
1094 	geth->freeq_order = new_order;
1095 	ret = geth_setup_freeq(geth);
1096 
1097 	/* Restart the interrupts - NOTE if this is the first resize
1098 	 * after probe(), this is where the interrupts get turned on
1099 	 * in the first place.
1100 	 */
1101 	spin_lock_irqsave(&geth->irq_lock, flags);
1102 	en |= SWFQ_EMPTY_INT_BIT;
1103 	writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1104 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1105 
1106 	return ret;
1107 }
1108 
1109 static void gmac_tx_irq_enable(struct net_device *netdev,
1110 			       unsigned int txq, int en)
1111 {
1112 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1113 	struct gemini_ethernet *geth = port->geth;
1114 	u32 val, mask;
1115 
1116 	netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
1117 
1118 	mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
1119 
1120 	if (en)
1121 		writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1122 
1123 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1124 	val = en ? val | mask : val & ~mask;
1125 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1126 }
1127 
1128 static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
1129 {
1130 	struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num);
1131 
1132 	gmac_tx_irq_enable(netdev, txq_num, 0);
1133 	netif_tx_wake_queue(ntxq);
1134 }
1135 
1136 static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb,
1137 			    struct gmac_txq *txq, unsigned short *desc)
1138 {
1139 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1140 	struct skb_shared_info *skb_si =  skb_shinfo(skb);
1141 	unsigned short m = (1 << port->txq_order) - 1;
1142 	short frag, last_frag = skb_si->nr_frags - 1;
1143 	struct gemini_ethernet *geth = port->geth;
1144 	unsigned int word1, word3, buflen;
1145 	unsigned short w = *desc;
1146 	struct gmac_txdesc *txd;
1147 	skb_frag_t *skb_frag;
1148 	dma_addr_t mapping;
1149 	unsigned short mtu;
1150 	void *buffer;
1151 
1152 	mtu  = ETH_HLEN;
1153 	mtu += netdev->mtu;
1154 	if (skb->protocol == htons(ETH_P_8021Q))
1155 		mtu += VLAN_HLEN;
1156 
1157 	word1 = skb->len;
1158 	word3 = SOF_BIT;
1159 
1160 	if (word1 > mtu) {
1161 		word1 |= TSS_MTU_ENABLE_BIT;
1162 		word3 |= mtu;
1163 	}
1164 
1165 	if (skb->ip_summed != CHECKSUM_NONE) {
1166 		int tcp = 0;
1167 
1168 		if (skb->protocol == htons(ETH_P_IP)) {
1169 			word1 |= TSS_IP_CHKSUM_BIT;
1170 			tcp = ip_hdr(skb)->protocol == IPPROTO_TCP;
1171 		} else { /* IPv6 */
1172 			word1 |= TSS_IPV6_ENABLE_BIT;
1173 			tcp = ipv6_hdr(skb)->nexthdr == IPPROTO_TCP;
1174 		}
1175 
1176 		word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT;
1177 	}
1178 
1179 	frag = -1;
1180 	while (frag <= last_frag) {
1181 		if (frag == -1) {
1182 			buffer = skb->data;
1183 			buflen = skb_headlen(skb);
1184 		} else {
1185 			skb_frag = skb_si->frags + frag;
1186 			buffer = skb_frag_address(skb_frag);
1187 			buflen = skb_frag_size(skb_frag);
1188 		}
1189 
1190 		if (frag == last_frag) {
1191 			word3 |= EOF_BIT;
1192 			txq->skb[w] = skb;
1193 		}
1194 
1195 		mapping = dma_map_single(geth->dev, buffer, buflen,
1196 					 DMA_TO_DEVICE);
1197 		if (dma_mapping_error(geth->dev, mapping))
1198 			goto map_error;
1199 
1200 		txd = txq->ring + w;
1201 		txd->word0.bits32 = buflen;
1202 		txd->word1.bits32 = word1;
1203 		txd->word2.buf_adr = mapping;
1204 		txd->word3.bits32 = word3;
1205 
1206 		word3 &= MTU_SIZE_BIT_MASK;
1207 		w++;
1208 		w &= m;
1209 		frag++;
1210 	}
1211 
1212 	*desc = w;
1213 	return 0;
1214 
1215 map_error:
1216 	while (w != *desc) {
1217 		w--;
1218 		w &= m;
1219 
1220 		dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr,
1221 			       txq->ring[w].word0.bits.buffer_size,
1222 			       DMA_TO_DEVICE);
1223 	}
1224 	return -ENOMEM;
1225 }
1226 
1227 static int gmac_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1228 {
1229 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1230 	unsigned short m = (1 << port->txq_order) - 1;
1231 	struct netdev_queue *ntxq;
1232 	unsigned short r, w, d;
1233 	void __iomem *ptr_reg;
1234 	struct gmac_txq *txq;
1235 	int txq_num, nfrags;
1236 	union dma_rwptr rw;
1237 
1238 	if (skb->len >= 0x10000)
1239 		goto out_drop_free;
1240 
1241 	txq_num = skb_get_queue_mapping(skb);
1242 	ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num);
1243 	txq = &port->txq[txq_num];
1244 	ntxq = netdev_get_tx_queue(netdev, txq_num);
1245 	nfrags = skb_shinfo(skb)->nr_frags;
1246 
1247 	rw.bits32 = readl(ptr_reg);
1248 	r = rw.bits.rptr;
1249 	w = rw.bits.wptr;
1250 
1251 	d = txq->cptr - w - 1;
1252 	d &= m;
1253 
1254 	if (d < nfrags + 2) {
1255 		gmac_clean_txq(netdev, txq, r);
1256 		d = txq->cptr - w - 1;
1257 		d &= m;
1258 
1259 		if (d < nfrags + 2) {
1260 			netif_tx_stop_queue(ntxq);
1261 
1262 			d = txq->cptr + nfrags + 16;
1263 			d &= m;
1264 			txq->ring[d].word3.bits.eofie = 1;
1265 			gmac_tx_irq_enable(netdev, txq_num, 1);
1266 
1267 			u64_stats_update_begin(&port->tx_stats_syncp);
1268 			netdev->stats.tx_fifo_errors++;
1269 			u64_stats_update_end(&port->tx_stats_syncp);
1270 			return NETDEV_TX_BUSY;
1271 		}
1272 	}
1273 
1274 	if (gmac_map_tx_bufs(netdev, skb, txq, &w)) {
1275 		if (skb_linearize(skb))
1276 			goto out_drop;
1277 
1278 		u64_stats_update_begin(&port->tx_stats_syncp);
1279 		port->tx_frags_linearized++;
1280 		u64_stats_update_end(&port->tx_stats_syncp);
1281 
1282 		if (gmac_map_tx_bufs(netdev, skb, txq, &w))
1283 			goto out_drop_free;
1284 	}
1285 
1286 	writew(w, ptr_reg + 2);
1287 
1288 	gmac_clean_txq(netdev, txq, r);
1289 	return NETDEV_TX_OK;
1290 
1291 out_drop_free:
1292 	dev_kfree_skb(skb);
1293 out_drop:
1294 	u64_stats_update_begin(&port->tx_stats_syncp);
1295 	port->stats.tx_dropped++;
1296 	u64_stats_update_end(&port->tx_stats_syncp);
1297 	return NETDEV_TX_OK;
1298 }
1299 
1300 static void gmac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1301 {
1302 	netdev_err(netdev, "Tx timeout\n");
1303 	gmac_dump_dma_state(netdev);
1304 }
1305 
1306 static void gmac_enable_irq(struct net_device *netdev, int enable)
1307 {
1308 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1309 	struct gemini_ethernet *geth = port->geth;
1310 	unsigned long flags;
1311 	u32 val, mask;
1312 
1313 	netdev_dbg(netdev, "%s device %d %s\n", __func__,
1314 		   netdev->dev_id, enable ? "enable" : "disable");
1315 	spin_lock_irqsave(&geth->irq_lock, flags);
1316 
1317 	mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2);
1318 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1319 	val = enable ? (val | mask) : (val & ~mask);
1320 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1321 
1322 	mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1323 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1324 	val = enable ? (val | mask) : (val & ~mask);
1325 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1326 
1327 	mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8);
1328 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1329 	val = enable ? (val | mask) : (val & ~mask);
1330 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1331 
1332 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1333 }
1334 
1335 static void gmac_enable_rx_irq(struct net_device *netdev, int enable)
1336 {
1337 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1338 	struct gemini_ethernet *geth = port->geth;
1339 	unsigned long flags;
1340 	u32 val, mask;
1341 
1342 	netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id,
1343 		   enable ? "enable" : "disable");
1344 	spin_lock_irqsave(&geth->irq_lock, flags);
1345 	mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1346 
1347 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1348 	val = enable ? (val | mask) : (val & ~mask);
1349 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1350 
1351 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1352 }
1353 
1354 static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port,
1355 					      union gmac_rxdesc_0 word0,
1356 					      unsigned int frame_len)
1357 {
1358 	unsigned int rx_csum = word0.bits.chksum_status;
1359 	unsigned int rx_status = word0.bits.status;
1360 	struct sk_buff *skb = NULL;
1361 
1362 	port->rx_stats[rx_status]++;
1363 	port->rx_csum_stats[rx_csum]++;
1364 
1365 	if (word0.bits.derr || word0.bits.perr ||
1366 	    rx_status || frame_len < ETH_ZLEN ||
1367 	    rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) {
1368 		port->stats.rx_errors++;
1369 
1370 		if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status))
1371 			port->stats.rx_length_errors++;
1372 		if (RX_ERROR_OVER(rx_status))
1373 			port->stats.rx_over_errors++;
1374 		if (RX_ERROR_CRC(rx_status))
1375 			port->stats.rx_crc_errors++;
1376 		if (RX_ERROR_FRAME(rx_status))
1377 			port->stats.rx_frame_errors++;
1378 		return NULL;
1379 	}
1380 
1381 	skb = napi_get_frags(&port->napi);
1382 	if (!skb)
1383 		goto update_exit;
1384 
1385 	if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK)
1386 		skb->ip_summed = CHECKSUM_UNNECESSARY;
1387 
1388 update_exit:
1389 	port->stats.rx_bytes += frame_len;
1390 	port->stats.rx_packets++;
1391 	return skb;
1392 }
1393 
1394 static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
1395 {
1396 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1397 	unsigned short m = (1 << port->rxq_order) - 1;
1398 	struct gemini_ethernet *geth = port->geth;
1399 	void __iomem *ptr_reg = port->rxq_rwptr;
1400 	unsigned int frame_len, frag_len;
1401 	struct gmac_rxdesc *rx = NULL;
1402 	struct gmac_queue_page *gpage;
1403 	static struct sk_buff *skb;
1404 	union gmac_rxdesc_0 word0;
1405 	union gmac_rxdesc_1 word1;
1406 	union gmac_rxdesc_3 word3;
1407 	struct page *page = NULL;
1408 	unsigned int page_offs;
1409 	unsigned short r, w;
1410 	union dma_rwptr rw;
1411 	dma_addr_t mapping;
1412 	int frag_nr = 0;
1413 
1414 	rw.bits32 = readl(ptr_reg);
1415 	/* Reset interrupt as all packages until here are taken into account */
1416 	writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
1417 	       geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1418 	r = rw.bits.rptr;
1419 	w = rw.bits.wptr;
1420 
1421 	while (budget && w != r) {
1422 		rx = port->rxq_ring + r;
1423 		word0 = rx->word0;
1424 		word1 = rx->word1;
1425 		mapping = rx->word2.buf_adr;
1426 		word3 = rx->word3;
1427 
1428 		r++;
1429 		r &= m;
1430 
1431 		frag_len = word0.bits.buffer_size;
1432 		frame_len = word1.bits.byte_count;
1433 		page_offs = mapping & ~PAGE_MASK;
1434 
1435 		if (!mapping) {
1436 			netdev_err(netdev,
1437 				   "rxq[%u]: HW BUG: zero DMA desc\n", r);
1438 			goto err_drop;
1439 		}
1440 
1441 		/* Freeq pointers are one page off */
1442 		gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
1443 		if (!gpage) {
1444 			dev_err(geth->dev, "could not find mapping\n");
1445 			continue;
1446 		}
1447 		page = gpage->page;
1448 
1449 		if (word3.bits32 & SOF_BIT) {
1450 			if (skb) {
1451 				napi_free_frags(&port->napi);
1452 				port->stats.rx_dropped++;
1453 			}
1454 
1455 			skb = gmac_skb_if_good_frame(port, word0, frame_len);
1456 			if (!skb)
1457 				goto err_drop;
1458 
1459 			page_offs += NET_IP_ALIGN;
1460 			frag_len -= NET_IP_ALIGN;
1461 			frag_nr = 0;
1462 
1463 		} else if (!skb) {
1464 			put_page(page);
1465 			continue;
1466 		}
1467 
1468 		if (word3.bits32 & EOF_BIT)
1469 			frag_len = frame_len - skb->len;
1470 
1471 		/* append page frag to skb */
1472 		if (frag_nr == MAX_SKB_FRAGS)
1473 			goto err_drop;
1474 
1475 		if (frag_len == 0)
1476 			netdev_err(netdev, "Received fragment with len = 0\n");
1477 
1478 		skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
1479 		skb->len += frag_len;
1480 		skb->data_len += frag_len;
1481 		skb->truesize += frag_len;
1482 		frag_nr++;
1483 
1484 		if (word3.bits32 & EOF_BIT) {
1485 			napi_gro_frags(&port->napi);
1486 			skb = NULL;
1487 			--budget;
1488 		}
1489 		continue;
1490 
1491 err_drop:
1492 		if (skb) {
1493 			napi_free_frags(&port->napi);
1494 			skb = NULL;
1495 		}
1496 
1497 		if (mapping)
1498 			put_page(page);
1499 
1500 		port->stats.rx_dropped++;
1501 	}
1502 
1503 	writew(r, ptr_reg);
1504 	return budget;
1505 }
1506 
1507 static int gmac_napi_poll(struct napi_struct *napi, int budget)
1508 {
1509 	struct gemini_ethernet_port *port = netdev_priv(napi->dev);
1510 	struct gemini_ethernet *geth = port->geth;
1511 	unsigned int freeq_threshold;
1512 	unsigned int received;
1513 
1514 	freeq_threshold = 1 << (geth->freeq_order - 1);
1515 	u64_stats_update_begin(&port->rx_stats_syncp);
1516 
1517 	received = gmac_rx(napi->dev, budget);
1518 	if (received < budget) {
1519 		napi_gro_flush(napi, false);
1520 		napi_complete_done(napi, received);
1521 		gmac_enable_rx_irq(napi->dev, 1);
1522 		++port->rx_napi_exits;
1523 	}
1524 
1525 	port->freeq_refill += (budget - received);
1526 	if (port->freeq_refill > freeq_threshold) {
1527 		port->freeq_refill -= freeq_threshold;
1528 		geth_fill_freeq(geth, true);
1529 	}
1530 
1531 	u64_stats_update_end(&port->rx_stats_syncp);
1532 	return received;
1533 }
1534 
1535 static void gmac_dump_dma_state(struct net_device *netdev)
1536 {
1537 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1538 	struct gemini_ethernet *geth = port->geth;
1539 	void __iomem *ptr_reg;
1540 	u32 reg[5];
1541 
1542 	/* Interrupt status */
1543 	reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1544 	reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1545 	reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
1546 	reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
1547 	reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1548 	netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1549 		   reg[0], reg[1], reg[2], reg[3], reg[4]);
1550 
1551 	/* Interrupt enable */
1552 	reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1553 	reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1554 	reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
1555 	reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
1556 	reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1557 	netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1558 		   reg[0], reg[1], reg[2], reg[3], reg[4]);
1559 
1560 	/* RX DMA status */
1561 	reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG);
1562 	reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG);
1563 	reg[2] = GET_RPTR(port->rxq_rwptr);
1564 	reg[3] = GET_WPTR(port->rxq_rwptr);
1565 	netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1566 		   reg[0], reg[1], reg[2], reg[3]);
1567 
1568 	reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG);
1569 	reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG);
1570 	reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG);
1571 	reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG);
1572 	netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1573 		   reg[0], reg[1], reg[2], reg[3]);
1574 
1575 	/* TX DMA status */
1576 	ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
1577 
1578 	reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG);
1579 	reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG);
1580 	reg[2] = GET_RPTR(ptr_reg);
1581 	reg[3] = GET_WPTR(ptr_reg);
1582 	netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1583 		   reg[0], reg[1], reg[2], reg[3]);
1584 
1585 	reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG);
1586 	reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG);
1587 	reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG);
1588 	reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG);
1589 	netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1590 		   reg[0], reg[1], reg[2], reg[3]);
1591 
1592 	/* FREE queues status */
1593 	ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG;
1594 
1595 	reg[0] = GET_RPTR(ptr_reg);
1596 	reg[1] = GET_WPTR(ptr_reg);
1597 
1598 	ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG;
1599 
1600 	reg[2] = GET_RPTR(ptr_reg);
1601 	reg[3] = GET_WPTR(ptr_reg);
1602 	netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n",
1603 		   reg[0], reg[1], reg[2], reg[3]);
1604 }
1605 
1606 static void gmac_update_hw_stats(struct net_device *netdev)
1607 {
1608 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1609 	unsigned int rx_discards, rx_mcast, rx_bcast;
1610 	struct gemini_ethernet *geth = port->geth;
1611 	unsigned long flags;
1612 
1613 	spin_lock_irqsave(&geth->irq_lock, flags);
1614 	u64_stats_update_begin(&port->ir_stats_syncp);
1615 
1616 	rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS);
1617 	port->hw_stats[0] += rx_discards;
1618 	port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS);
1619 	rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST);
1620 	port->hw_stats[2] += rx_mcast;
1621 	rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST);
1622 	port->hw_stats[3] += rx_bcast;
1623 	port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1);
1624 	port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2);
1625 
1626 	port->stats.rx_missed_errors += rx_discards;
1627 	port->stats.multicast += rx_mcast;
1628 	port->stats.multicast += rx_bcast;
1629 
1630 	writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8),
1631 	       geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1632 
1633 	u64_stats_update_end(&port->ir_stats_syncp);
1634 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1635 }
1636 
1637 /**
1638  * gmac_get_intr_flags() - get interrupt status flags for a port from
1639  * @netdev: the net device for the port to get flags from
1640  * @i: the interrupt status register 0..4
1641  */
1642 static u32 gmac_get_intr_flags(struct net_device *netdev, int i)
1643 {
1644 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1645 	struct gemini_ethernet *geth = port->geth;
1646 	void __iomem *irqif_reg, *irqen_reg;
1647 	unsigned int offs, val;
1648 
1649 	/* Calculate the offset using the stride of the status registers */
1650 	offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG -
1651 		    GLOBAL_INTERRUPT_STATUS_0_REG);
1652 
1653 	irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs;
1654 	irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs;
1655 
1656 	val = readl(irqif_reg) & readl(irqen_reg);
1657 	return val;
1658 }
1659 
1660 static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer)
1661 {
1662 	struct gemini_ethernet_port *port =
1663 		container_of(timer, struct gemini_ethernet_port,
1664 			     rx_coalesce_timer);
1665 
1666 	napi_schedule(&port->napi);
1667 	return HRTIMER_NORESTART;
1668 }
1669 
1670 static irqreturn_t gmac_irq(int irq, void *data)
1671 {
1672 	struct gemini_ethernet_port *port;
1673 	struct net_device *netdev = data;
1674 	struct gemini_ethernet *geth;
1675 	u32 val, orr = 0;
1676 
1677 	port = netdev_priv(netdev);
1678 	geth = port->geth;
1679 
1680 	val = gmac_get_intr_flags(netdev, 0);
1681 	orr |= val;
1682 
1683 	if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) {
1684 		/* Oh, crap */
1685 		netdev_err(netdev, "hw failure/sw bug\n");
1686 		gmac_dump_dma_state(netdev);
1687 
1688 		/* don't know how to recover, just reduce losses */
1689 		gmac_enable_irq(netdev, 0);
1690 		return IRQ_HANDLED;
1691 	}
1692 
1693 	if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6)))
1694 		gmac_tx_irq(netdev, 0);
1695 
1696 	val = gmac_get_intr_flags(netdev, 1);
1697 	orr |= val;
1698 
1699 	if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) {
1700 		gmac_enable_rx_irq(netdev, 0);
1701 
1702 		if (!port->rx_coalesce_nsecs) {
1703 			napi_schedule(&port->napi);
1704 		} else {
1705 			ktime_t ktime;
1706 
1707 			ktime = ktime_set(0, port->rx_coalesce_nsecs);
1708 			hrtimer_start(&port->rx_coalesce_timer, ktime,
1709 				      HRTIMER_MODE_REL);
1710 		}
1711 	}
1712 
1713 	val = gmac_get_intr_flags(netdev, 4);
1714 	orr |= val;
1715 
1716 	if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8)))
1717 		gmac_update_hw_stats(netdev);
1718 
1719 	if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
1720 		writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
1721 		       geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1722 
1723 		spin_lock(&geth->irq_lock);
1724 		u64_stats_update_begin(&port->ir_stats_syncp);
1725 		++port->stats.rx_fifo_errors;
1726 		u64_stats_update_end(&port->ir_stats_syncp);
1727 		spin_unlock(&geth->irq_lock);
1728 	}
1729 
1730 	return orr ? IRQ_HANDLED : IRQ_NONE;
1731 }
1732 
1733 static void gmac_start_dma(struct gemini_ethernet_port *port)
1734 {
1735 	void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1736 	union gmac_dma_ctrl dma_ctrl;
1737 
1738 	dma_ctrl.bits32 = readl(dma_ctrl_reg);
1739 	dma_ctrl.bits.rd_enable = 1;
1740 	dma_ctrl.bits.td_enable = 1;
1741 	dma_ctrl.bits.loopback = 0;
1742 	dma_ctrl.bits.drop_small_ack = 0;
1743 	dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN;
1744 	dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED;
1745 	dma_ctrl.bits.rd_burst_size = HBURST_INCR8;
1746 	dma_ctrl.bits.rd_bus = HSIZE_8;
1747 	dma_ctrl.bits.td_prot = HPROT_DATA_CACHE;
1748 	dma_ctrl.bits.td_burst_size = HBURST_INCR8;
1749 	dma_ctrl.bits.td_bus = HSIZE_8;
1750 
1751 	writel(dma_ctrl.bits32, dma_ctrl_reg);
1752 }
1753 
1754 static void gmac_stop_dma(struct gemini_ethernet_port *port)
1755 {
1756 	void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1757 	union gmac_dma_ctrl dma_ctrl;
1758 
1759 	dma_ctrl.bits32 = readl(dma_ctrl_reg);
1760 	dma_ctrl.bits.rd_enable = 0;
1761 	dma_ctrl.bits.td_enable = 0;
1762 	writel(dma_ctrl.bits32, dma_ctrl_reg);
1763 }
1764 
1765 static int gmac_open(struct net_device *netdev)
1766 {
1767 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1768 	int err;
1769 
1770 	if (!netdev->phydev) {
1771 		err = gmac_setup_phy(netdev);
1772 		if (err) {
1773 			netif_err(port, ifup, netdev,
1774 				  "PHY init failed: %d\n", err);
1775 			return err;
1776 		}
1777 	}
1778 
1779 	err = request_irq(netdev->irq, gmac_irq,
1780 			  IRQF_SHARED, netdev->name, netdev);
1781 	if (err) {
1782 		netdev_err(netdev, "no IRQ\n");
1783 		return err;
1784 	}
1785 
1786 	netif_carrier_off(netdev);
1787 	phy_start(netdev->phydev);
1788 
1789 	err = geth_resize_freeq(port);
1790 	/* It's fine if it's just busy, the other port has set up
1791 	 * the freeq in that case.
1792 	 */
1793 	if (err && (err != -EBUSY)) {
1794 		netdev_err(netdev, "could not resize freeq\n");
1795 		goto err_stop_phy;
1796 	}
1797 
1798 	err = gmac_setup_rxq(netdev);
1799 	if (err) {
1800 		netdev_err(netdev, "could not setup RXQ\n");
1801 		goto err_stop_phy;
1802 	}
1803 
1804 	err = gmac_setup_txqs(netdev);
1805 	if (err) {
1806 		netdev_err(netdev, "could not setup TXQs\n");
1807 		gmac_cleanup_rxq(netdev);
1808 		goto err_stop_phy;
1809 	}
1810 
1811 	napi_enable(&port->napi);
1812 
1813 	gmac_start_dma(port);
1814 	gmac_enable_irq(netdev, 1);
1815 	gmac_enable_tx_rx(netdev);
1816 	netif_tx_start_all_queues(netdev);
1817 
1818 	hrtimer_init(&port->rx_coalesce_timer, CLOCK_MONOTONIC,
1819 		     HRTIMER_MODE_REL);
1820 	port->rx_coalesce_timer.function = &gmac_coalesce_delay_expired;
1821 
1822 	netdev_dbg(netdev, "opened\n");
1823 
1824 	return 0;
1825 
1826 err_stop_phy:
1827 	phy_stop(netdev->phydev);
1828 	free_irq(netdev->irq, netdev);
1829 	return err;
1830 }
1831 
1832 static int gmac_stop(struct net_device *netdev)
1833 {
1834 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1835 
1836 	hrtimer_cancel(&port->rx_coalesce_timer);
1837 	netif_tx_stop_all_queues(netdev);
1838 	gmac_disable_tx_rx(netdev);
1839 	gmac_stop_dma(port);
1840 	napi_disable(&port->napi);
1841 
1842 	gmac_enable_irq(netdev, 0);
1843 	gmac_cleanup_rxq(netdev);
1844 	gmac_cleanup_txqs(netdev);
1845 
1846 	phy_stop(netdev->phydev);
1847 	free_irq(netdev->irq, netdev);
1848 
1849 	gmac_update_hw_stats(netdev);
1850 	return 0;
1851 }
1852 
1853 static void gmac_set_rx_mode(struct net_device *netdev)
1854 {
1855 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1856 	union gmac_rx_fltr filter = { .bits = {
1857 		.broadcast = 1,
1858 		.multicast = 1,
1859 		.unicast = 1,
1860 	} };
1861 	struct netdev_hw_addr *ha;
1862 	unsigned int bit_nr;
1863 	u32 mc_filter[2];
1864 
1865 	mc_filter[1] = 0;
1866 	mc_filter[0] = 0;
1867 
1868 	if (netdev->flags & IFF_PROMISC) {
1869 		filter.bits.error = 1;
1870 		filter.bits.promiscuous = 1;
1871 		mc_filter[1] = ~0;
1872 		mc_filter[0] = ~0;
1873 	} else if (netdev->flags & IFF_ALLMULTI) {
1874 		mc_filter[1] = ~0;
1875 		mc_filter[0] = ~0;
1876 	} else {
1877 		netdev_for_each_mc_addr(ha, netdev) {
1878 			bit_nr = ~crc32_le(~0, ha->addr, ETH_ALEN) & 0x3f;
1879 			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 0x1f);
1880 		}
1881 	}
1882 
1883 	writel(mc_filter[0], port->gmac_base + GMAC_MCAST_FIL0);
1884 	writel(mc_filter[1], port->gmac_base + GMAC_MCAST_FIL1);
1885 	writel(filter.bits32, port->gmac_base + GMAC_RX_FLTR);
1886 }
1887 
1888 static void gmac_write_mac_address(struct net_device *netdev)
1889 {
1890 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1891 	__le32 addr[3];
1892 
1893 	memset(addr, 0, sizeof(addr));
1894 	memcpy(addr, netdev->dev_addr, ETH_ALEN);
1895 
1896 	writel(le32_to_cpu(addr[0]), port->gmac_base + GMAC_STA_ADD0);
1897 	writel(le32_to_cpu(addr[1]), port->gmac_base + GMAC_STA_ADD1);
1898 	writel(le32_to_cpu(addr[2]), port->gmac_base + GMAC_STA_ADD2);
1899 }
1900 
1901 static int gmac_set_mac_address(struct net_device *netdev, void *addr)
1902 {
1903 	struct sockaddr *sa = addr;
1904 
1905 	memcpy(netdev->dev_addr, sa->sa_data, ETH_ALEN);
1906 	gmac_write_mac_address(netdev);
1907 
1908 	return 0;
1909 }
1910 
1911 static void gmac_clear_hw_stats(struct net_device *netdev)
1912 {
1913 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1914 
1915 	readl(port->gmac_base + GMAC_IN_DISCARDS);
1916 	readl(port->gmac_base + GMAC_IN_ERRORS);
1917 	readl(port->gmac_base + GMAC_IN_MCAST);
1918 	readl(port->gmac_base + GMAC_IN_BCAST);
1919 	readl(port->gmac_base + GMAC_IN_MAC1);
1920 	readl(port->gmac_base + GMAC_IN_MAC2);
1921 }
1922 
1923 static void gmac_get_stats64(struct net_device *netdev,
1924 			     struct rtnl_link_stats64 *stats)
1925 {
1926 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1927 	unsigned int start;
1928 
1929 	gmac_update_hw_stats(netdev);
1930 
1931 	/* Racing with RX NAPI */
1932 	do {
1933 		start = u64_stats_fetch_begin(&port->rx_stats_syncp);
1934 
1935 		stats->rx_packets = port->stats.rx_packets;
1936 		stats->rx_bytes = port->stats.rx_bytes;
1937 		stats->rx_errors = port->stats.rx_errors;
1938 		stats->rx_dropped = port->stats.rx_dropped;
1939 
1940 		stats->rx_length_errors = port->stats.rx_length_errors;
1941 		stats->rx_over_errors = port->stats.rx_over_errors;
1942 		stats->rx_crc_errors = port->stats.rx_crc_errors;
1943 		stats->rx_frame_errors = port->stats.rx_frame_errors;
1944 
1945 	} while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
1946 
1947 	/* Racing with MIB and TX completion interrupts */
1948 	do {
1949 		start = u64_stats_fetch_begin(&port->ir_stats_syncp);
1950 
1951 		stats->tx_errors = port->stats.tx_errors;
1952 		stats->tx_packets = port->stats.tx_packets;
1953 		stats->tx_bytes = port->stats.tx_bytes;
1954 
1955 		stats->multicast = port->stats.multicast;
1956 		stats->rx_missed_errors = port->stats.rx_missed_errors;
1957 		stats->rx_fifo_errors = port->stats.rx_fifo_errors;
1958 
1959 	} while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
1960 
1961 	/* Racing with hard_start_xmit */
1962 	do {
1963 		start = u64_stats_fetch_begin(&port->tx_stats_syncp);
1964 
1965 		stats->tx_dropped = port->stats.tx_dropped;
1966 
1967 	} while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
1968 
1969 	stats->rx_dropped += stats->rx_missed_errors;
1970 }
1971 
1972 static int gmac_change_mtu(struct net_device *netdev, int new_mtu)
1973 {
1974 	int max_len = gmac_pick_rx_max_len(new_mtu);
1975 
1976 	if (max_len < 0)
1977 		return -EINVAL;
1978 
1979 	gmac_disable_tx_rx(netdev);
1980 
1981 	netdev->mtu = new_mtu;
1982 	gmac_update_config0_reg(netdev, max_len << CONFIG0_MAXLEN_SHIFT,
1983 				CONFIG0_MAXLEN_MASK);
1984 
1985 	netdev_update_features(netdev);
1986 
1987 	gmac_enable_tx_rx(netdev);
1988 
1989 	return 0;
1990 }
1991 
1992 static netdev_features_t gmac_fix_features(struct net_device *netdev,
1993 					   netdev_features_t features)
1994 {
1995 	if (netdev->mtu + ETH_HLEN + VLAN_HLEN > MTU_SIZE_BIT_MASK)
1996 		features &= ~GMAC_OFFLOAD_FEATURES;
1997 
1998 	return features;
1999 }
2000 
2001 static int gmac_set_features(struct net_device *netdev,
2002 			     netdev_features_t features)
2003 {
2004 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2005 	int enable = features & NETIF_F_RXCSUM;
2006 	unsigned long flags;
2007 	u32 reg;
2008 
2009 	spin_lock_irqsave(&port->config_lock, flags);
2010 
2011 	reg = readl(port->gmac_base + GMAC_CONFIG0);
2012 	reg = enable ? reg | CONFIG0_RX_CHKSUM : reg & ~CONFIG0_RX_CHKSUM;
2013 	writel(reg, port->gmac_base + GMAC_CONFIG0);
2014 
2015 	spin_unlock_irqrestore(&port->config_lock, flags);
2016 	return 0;
2017 }
2018 
2019 static int gmac_get_sset_count(struct net_device *netdev, int sset)
2020 {
2021 	return sset == ETH_SS_STATS ? GMAC_STATS_NUM : 0;
2022 }
2023 
2024 static void gmac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
2025 {
2026 	if (stringset != ETH_SS_STATS)
2027 		return;
2028 
2029 	memcpy(data, gmac_stats_strings, sizeof(gmac_stats_strings));
2030 }
2031 
2032 static void gmac_get_ethtool_stats(struct net_device *netdev,
2033 				   struct ethtool_stats *estats, u64 *values)
2034 {
2035 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2036 	unsigned int start;
2037 	u64 *p;
2038 	int i;
2039 
2040 	gmac_update_hw_stats(netdev);
2041 
2042 	/* Racing with MIB interrupt */
2043 	do {
2044 		p = values;
2045 		start = u64_stats_fetch_begin(&port->ir_stats_syncp);
2046 
2047 		for (i = 0; i < RX_STATS_NUM; i++)
2048 			*p++ = port->hw_stats[i];
2049 
2050 	} while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
2051 	values = p;
2052 
2053 	/* Racing with RX NAPI */
2054 	do {
2055 		p = values;
2056 		start = u64_stats_fetch_begin(&port->rx_stats_syncp);
2057 
2058 		for (i = 0; i < RX_STATUS_NUM; i++)
2059 			*p++ = port->rx_stats[i];
2060 		for (i = 0; i < RX_CHKSUM_NUM; i++)
2061 			*p++ = port->rx_csum_stats[i];
2062 		*p++ = port->rx_napi_exits;
2063 
2064 	} while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
2065 	values = p;
2066 
2067 	/* Racing with TX start_xmit */
2068 	do {
2069 		p = values;
2070 		start = u64_stats_fetch_begin(&port->tx_stats_syncp);
2071 
2072 		for (i = 0; i < TX_MAX_FRAGS; i++) {
2073 			*values++ = port->tx_frag_stats[i];
2074 			port->tx_frag_stats[i] = 0;
2075 		}
2076 		*values++ = port->tx_frags_linearized;
2077 		*values++ = port->tx_hw_csummed;
2078 
2079 	} while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
2080 }
2081 
2082 static int gmac_get_ksettings(struct net_device *netdev,
2083 			      struct ethtool_link_ksettings *cmd)
2084 {
2085 	if (!netdev->phydev)
2086 		return -ENXIO;
2087 	phy_ethtool_ksettings_get(netdev->phydev, cmd);
2088 
2089 	return 0;
2090 }
2091 
2092 static int gmac_set_ksettings(struct net_device *netdev,
2093 			      const struct ethtool_link_ksettings *cmd)
2094 {
2095 	if (!netdev->phydev)
2096 		return -ENXIO;
2097 	return phy_ethtool_ksettings_set(netdev->phydev, cmd);
2098 }
2099 
2100 static int gmac_nway_reset(struct net_device *netdev)
2101 {
2102 	if (!netdev->phydev)
2103 		return -ENXIO;
2104 	return phy_start_aneg(netdev->phydev);
2105 }
2106 
2107 static void gmac_get_pauseparam(struct net_device *netdev,
2108 				struct ethtool_pauseparam *pparam)
2109 {
2110 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2111 	union gmac_config0 config0;
2112 
2113 	config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2114 
2115 	pparam->rx_pause = config0.bits.rx_fc_en;
2116 	pparam->tx_pause = config0.bits.tx_fc_en;
2117 	pparam->autoneg = true;
2118 }
2119 
2120 static void gmac_get_ringparam(struct net_device *netdev,
2121 			       struct ethtool_ringparam *rp)
2122 {
2123 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2124 	union gmac_config0 config0;
2125 
2126 	config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2127 
2128 	rp->rx_max_pending = 1 << 15;
2129 	rp->rx_mini_max_pending = 0;
2130 	rp->rx_jumbo_max_pending = 0;
2131 	rp->tx_max_pending = 1 << 15;
2132 
2133 	rp->rx_pending = 1 << port->rxq_order;
2134 	rp->rx_mini_pending = 0;
2135 	rp->rx_jumbo_pending = 0;
2136 	rp->tx_pending = 1 << port->txq_order;
2137 }
2138 
2139 static int gmac_set_ringparam(struct net_device *netdev,
2140 			      struct ethtool_ringparam *rp)
2141 {
2142 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2143 	int err = 0;
2144 
2145 	if (netif_running(netdev))
2146 		return -EBUSY;
2147 
2148 	if (rp->rx_pending) {
2149 		port->rxq_order = min(15, ilog2(rp->rx_pending - 1) + 1);
2150 		err = geth_resize_freeq(port);
2151 	}
2152 	if (rp->tx_pending) {
2153 		port->txq_order = min(15, ilog2(rp->tx_pending - 1) + 1);
2154 		port->irq_every_tx_packets = 1 << (port->txq_order - 2);
2155 	}
2156 
2157 	return err;
2158 }
2159 
2160 static int gmac_get_coalesce(struct net_device *netdev,
2161 			     struct ethtool_coalesce *ecmd)
2162 {
2163 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2164 
2165 	ecmd->rx_max_coalesced_frames = 1;
2166 	ecmd->tx_max_coalesced_frames = port->irq_every_tx_packets;
2167 	ecmd->rx_coalesce_usecs = port->rx_coalesce_nsecs / 1000;
2168 
2169 	return 0;
2170 }
2171 
2172 static int gmac_set_coalesce(struct net_device *netdev,
2173 			     struct ethtool_coalesce *ecmd)
2174 {
2175 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2176 
2177 	if (ecmd->tx_max_coalesced_frames < 1)
2178 		return -EINVAL;
2179 	if (ecmd->tx_max_coalesced_frames >= 1 << port->txq_order)
2180 		return -EINVAL;
2181 
2182 	port->irq_every_tx_packets = ecmd->tx_max_coalesced_frames;
2183 	port->rx_coalesce_nsecs = ecmd->rx_coalesce_usecs * 1000;
2184 
2185 	return 0;
2186 }
2187 
2188 static u32 gmac_get_msglevel(struct net_device *netdev)
2189 {
2190 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2191 
2192 	return port->msg_enable;
2193 }
2194 
2195 static void gmac_set_msglevel(struct net_device *netdev, u32 level)
2196 {
2197 	struct gemini_ethernet_port *port = netdev_priv(netdev);
2198 
2199 	port->msg_enable = level;
2200 }
2201 
2202 static void gmac_get_drvinfo(struct net_device *netdev,
2203 			     struct ethtool_drvinfo *info)
2204 {
2205 	strcpy(info->driver,  DRV_NAME);
2206 	strcpy(info->bus_info, netdev->dev_id ? "1" : "0");
2207 }
2208 
2209 static const struct net_device_ops gmac_351x_ops = {
2210 	.ndo_init		= gmac_init,
2211 	.ndo_uninit		= gmac_uninit,
2212 	.ndo_open		= gmac_open,
2213 	.ndo_stop		= gmac_stop,
2214 	.ndo_start_xmit		= gmac_start_xmit,
2215 	.ndo_tx_timeout		= gmac_tx_timeout,
2216 	.ndo_set_rx_mode	= gmac_set_rx_mode,
2217 	.ndo_set_mac_address	= gmac_set_mac_address,
2218 	.ndo_get_stats64	= gmac_get_stats64,
2219 	.ndo_change_mtu		= gmac_change_mtu,
2220 	.ndo_fix_features	= gmac_fix_features,
2221 	.ndo_set_features	= gmac_set_features,
2222 };
2223 
2224 static const struct ethtool_ops gmac_351x_ethtool_ops = {
2225 	.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS |
2226 				     ETHTOOL_COALESCE_MAX_FRAMES,
2227 	.get_sset_count	= gmac_get_sset_count,
2228 	.get_strings	= gmac_get_strings,
2229 	.get_ethtool_stats = gmac_get_ethtool_stats,
2230 	.get_link	= ethtool_op_get_link,
2231 	.get_link_ksettings = gmac_get_ksettings,
2232 	.set_link_ksettings = gmac_set_ksettings,
2233 	.nway_reset	= gmac_nway_reset,
2234 	.get_pauseparam	= gmac_get_pauseparam,
2235 	.get_ringparam	= gmac_get_ringparam,
2236 	.set_ringparam	= gmac_set_ringparam,
2237 	.get_coalesce	= gmac_get_coalesce,
2238 	.set_coalesce	= gmac_set_coalesce,
2239 	.get_msglevel	= gmac_get_msglevel,
2240 	.set_msglevel	= gmac_set_msglevel,
2241 	.get_drvinfo	= gmac_get_drvinfo,
2242 };
2243 
2244 static irqreturn_t gemini_port_irq_thread(int irq, void *data)
2245 {
2246 	unsigned long irqmask = SWFQ_EMPTY_INT_BIT;
2247 	struct gemini_ethernet_port *port = data;
2248 	struct gemini_ethernet *geth;
2249 	unsigned long flags;
2250 
2251 	geth = port->geth;
2252 	/* The queue is half empty so refill it */
2253 	geth_fill_freeq(geth, true);
2254 
2255 	spin_lock_irqsave(&geth->irq_lock, flags);
2256 	/* ACK queue interrupt */
2257 	writel(irqmask, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2258 	/* Enable queue interrupt again */
2259 	irqmask |= readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2260 	writel(irqmask, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2261 	spin_unlock_irqrestore(&geth->irq_lock, flags);
2262 
2263 	return IRQ_HANDLED;
2264 }
2265 
2266 static irqreturn_t gemini_port_irq(int irq, void *data)
2267 {
2268 	struct gemini_ethernet_port *port = data;
2269 	struct gemini_ethernet *geth;
2270 	irqreturn_t ret = IRQ_NONE;
2271 	u32 val, en;
2272 
2273 	geth = port->geth;
2274 	spin_lock(&geth->irq_lock);
2275 
2276 	val = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2277 	en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2278 
2279 	if (val & en & SWFQ_EMPTY_INT_BIT) {
2280 		/* Disable the queue empty interrupt while we work on
2281 		 * processing the queue. Also disable overrun interrupts
2282 		 * as there is not much we can do about it here.
2283 		 */
2284 		en &= ~(SWFQ_EMPTY_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT
2285 					   | GMAC1_RX_OVERRUN_INT_BIT);
2286 		writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2287 		ret = IRQ_WAKE_THREAD;
2288 	}
2289 
2290 	spin_unlock(&geth->irq_lock);
2291 
2292 	return ret;
2293 }
2294 
2295 static void gemini_port_remove(struct gemini_ethernet_port *port)
2296 {
2297 	if (port->netdev)
2298 		unregister_netdev(port->netdev);
2299 	clk_disable_unprepare(port->pclk);
2300 	geth_cleanup_freeq(port->geth);
2301 }
2302 
2303 static void gemini_ethernet_init(struct gemini_ethernet *geth)
2304 {
2305 	/* Only do this once both ports are online */
2306 	if (geth->initialized)
2307 		return;
2308 	if (geth->port0 && geth->port1)
2309 		geth->initialized = true;
2310 	else
2311 		return;
2312 
2313 	writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
2314 	writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
2315 	writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
2316 	writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
2317 	writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2318 
2319 	/* Interrupt config:
2320 	 *
2321 	 *	GMAC0 intr bits ------> int0 ----> eth0
2322 	 *	GMAC1 intr bits ------> int1 ----> eth1
2323 	 *	TOE intr -------------> int1 ----> eth1
2324 	 *	Classification Intr --> int0 ----> eth0
2325 	 *	Default Q0 -----------> int0 ----> eth0
2326 	 *	Default Q1 -----------> int1 ----> eth1
2327 	 *	FreeQ intr -----------> int1 ----> eth1
2328 	 */
2329 	writel(0xCCFC0FC0, geth->base + GLOBAL_INTERRUPT_SELECT_0_REG);
2330 	writel(0x00F00002, geth->base + GLOBAL_INTERRUPT_SELECT_1_REG);
2331 	writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_2_REG);
2332 	writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_3_REG);
2333 	writel(0xFF000003, geth->base + GLOBAL_INTERRUPT_SELECT_4_REG);
2334 
2335 	/* edge-triggered interrupts packed to level-triggered one... */
2336 	writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
2337 	writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
2338 	writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
2339 	writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
2340 	writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2341 
2342 	/* Set up queue */
2343 	writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
2344 	writel(0, geth->base + GLOBAL_HW_FREEQ_BASE_SIZE_REG);
2345 	writel(0, geth->base + GLOBAL_SWFQ_RWPTR_REG);
2346 	writel(0, geth->base + GLOBAL_HWFQ_RWPTR_REG);
2347 
2348 	geth->freeq_frag_order = DEFAULT_RX_BUF_ORDER;
2349 	/* This makes the queue resize on probe() so that we
2350 	 * set up and enable the queue IRQ. FIXME: fragile.
2351 	 */
2352 	geth->freeq_order = 1;
2353 }
2354 
2355 static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port)
2356 {
2357 	port->mac_addr[0] =
2358 		cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD0));
2359 	port->mac_addr[1] =
2360 		cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD1));
2361 	port->mac_addr[2] =
2362 		cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD2));
2363 }
2364 
2365 static int gemini_ethernet_port_probe(struct platform_device *pdev)
2366 {
2367 	char *port_names[2] = { "ethernet0", "ethernet1" };
2368 	struct gemini_ethernet_port *port;
2369 	struct device *dev = &pdev->dev;
2370 	struct gemini_ethernet *geth;
2371 	struct net_device *netdev;
2372 	struct resource *gmacres;
2373 	struct resource *dmares;
2374 	struct device *parent;
2375 	unsigned int id;
2376 	int irq;
2377 	int ret;
2378 
2379 	parent = dev->parent;
2380 	geth = dev_get_drvdata(parent);
2381 
2382 	if (!strcmp(dev_name(dev), "60008000.ethernet-port"))
2383 		id = 0;
2384 	else if (!strcmp(dev_name(dev), "6000c000.ethernet-port"))
2385 		id = 1;
2386 	else
2387 		return -ENODEV;
2388 
2389 	dev_info(dev, "probe %s ID %d\n", dev_name(dev), id);
2390 
2391 	netdev = alloc_etherdev_mq(sizeof(*port), TX_QUEUE_NUM);
2392 	if (!netdev) {
2393 		dev_err(dev, "Can't allocate ethernet device #%d\n", id);
2394 		return -ENOMEM;
2395 	}
2396 
2397 	port = netdev_priv(netdev);
2398 	SET_NETDEV_DEV(netdev, dev);
2399 	port->netdev = netdev;
2400 	port->id = id;
2401 	port->geth = geth;
2402 	port->dev = dev;
2403 	port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2404 
2405 	/* DMA memory */
2406 	dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2407 	if (!dmares) {
2408 		dev_err(dev, "no DMA resource\n");
2409 		return -ENODEV;
2410 	}
2411 	port->dma_base = devm_ioremap_resource(dev, dmares);
2412 	if (IS_ERR(port->dma_base))
2413 		return PTR_ERR(port->dma_base);
2414 
2415 	/* GMAC config memory */
2416 	gmacres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2417 	if (!gmacres) {
2418 		dev_err(dev, "no GMAC resource\n");
2419 		return -ENODEV;
2420 	}
2421 	port->gmac_base = devm_ioremap_resource(dev, gmacres);
2422 	if (IS_ERR(port->gmac_base))
2423 		return PTR_ERR(port->gmac_base);
2424 
2425 	/* Interrupt */
2426 	irq = platform_get_irq(pdev, 0);
2427 	if (irq <= 0)
2428 		return irq ? irq : -ENODEV;
2429 	port->irq = irq;
2430 
2431 	/* Clock the port */
2432 	port->pclk = devm_clk_get(dev, "PCLK");
2433 	if (IS_ERR(port->pclk)) {
2434 		dev_err(dev, "no PCLK\n");
2435 		return PTR_ERR(port->pclk);
2436 	}
2437 	ret = clk_prepare_enable(port->pclk);
2438 	if (ret)
2439 		return ret;
2440 
2441 	/* Maybe there is a nice ethernet address we should use */
2442 	gemini_port_save_mac_addr(port);
2443 
2444 	/* Reset the port */
2445 	port->reset = devm_reset_control_get_exclusive(dev, NULL);
2446 	if (IS_ERR(port->reset)) {
2447 		dev_err(dev, "no reset\n");
2448 		return PTR_ERR(port->reset);
2449 	}
2450 	reset_control_reset(port->reset);
2451 	usleep_range(100, 500);
2452 
2453 	/* Assign pointer in the main state container */
2454 	if (!id)
2455 		geth->port0 = port;
2456 	else
2457 		geth->port1 = port;
2458 
2459 	/* This will just be done once both ports are up and reset */
2460 	gemini_ethernet_init(geth);
2461 
2462 	platform_set_drvdata(pdev, port);
2463 
2464 	/* Set up and register the netdev */
2465 	netdev->dev_id = port->id;
2466 	netdev->irq = irq;
2467 	netdev->netdev_ops = &gmac_351x_ops;
2468 	netdev->ethtool_ops = &gmac_351x_ethtool_ops;
2469 
2470 	spin_lock_init(&port->config_lock);
2471 	gmac_clear_hw_stats(netdev);
2472 
2473 	netdev->hw_features = GMAC_OFFLOAD_FEATURES;
2474 	netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO;
2475 	/* We can handle jumbo frames up to 10236 bytes so, let's accept
2476 	 * payloads of 10236 bytes minus VLAN and ethernet header
2477 	 */
2478 	netdev->min_mtu = ETH_MIN_MTU;
2479 	netdev->max_mtu = 10236 - VLAN_ETH_HLEN;
2480 
2481 	port->freeq_refill = 0;
2482 	netif_napi_add(netdev, &port->napi, gmac_napi_poll,
2483 		       DEFAULT_NAPI_WEIGHT);
2484 
2485 	if (is_valid_ether_addr((void *)port->mac_addr)) {
2486 		memcpy(netdev->dev_addr, port->mac_addr, ETH_ALEN);
2487 	} else {
2488 		dev_dbg(dev, "ethernet address 0x%08x%08x%08x invalid\n",
2489 			port->mac_addr[0], port->mac_addr[1],
2490 			port->mac_addr[2]);
2491 		dev_info(dev, "using a random ethernet address\n");
2492 		eth_random_addr(netdev->dev_addr);
2493 	}
2494 	gmac_write_mac_address(netdev);
2495 
2496 	ret = devm_request_threaded_irq(port->dev,
2497 					port->irq,
2498 					gemini_port_irq,
2499 					gemini_port_irq_thread,
2500 					IRQF_SHARED,
2501 					port_names[port->id],
2502 					port);
2503 	if (ret)
2504 		return ret;
2505 
2506 	ret = register_netdev(netdev);
2507 	if (!ret) {
2508 		netdev_info(netdev,
2509 			    "irq %d, DMA @ 0x%pap, GMAC @ 0x%pap\n",
2510 			    port->irq, &dmares->start,
2511 			    &gmacres->start);
2512 		ret = gmac_setup_phy(netdev);
2513 		if (ret)
2514 			netdev_info(netdev,
2515 				    "PHY init failed, deferring to ifup time\n");
2516 		return 0;
2517 	}
2518 
2519 	port->netdev = NULL;
2520 	free_netdev(netdev);
2521 	return ret;
2522 }
2523 
2524 static int gemini_ethernet_port_remove(struct platform_device *pdev)
2525 {
2526 	struct gemini_ethernet_port *port = platform_get_drvdata(pdev);
2527 
2528 	gemini_port_remove(port);
2529 	free_netdev(port->netdev);
2530 	return 0;
2531 }
2532 
2533 static const struct of_device_id gemini_ethernet_port_of_match[] = {
2534 	{
2535 		.compatible = "cortina,gemini-ethernet-port",
2536 	},
2537 	{},
2538 };
2539 MODULE_DEVICE_TABLE(of, gemini_ethernet_port_of_match);
2540 
2541 static struct platform_driver gemini_ethernet_port_driver = {
2542 	.driver = {
2543 		.name = "gemini-ethernet-port",
2544 		.of_match_table = of_match_ptr(gemini_ethernet_port_of_match),
2545 	},
2546 	.probe = gemini_ethernet_port_probe,
2547 	.remove = gemini_ethernet_port_remove,
2548 };
2549 
2550 static int gemini_ethernet_probe(struct platform_device *pdev)
2551 {
2552 	struct device *dev = &pdev->dev;
2553 	struct gemini_ethernet *geth;
2554 	unsigned int retry = 5;
2555 	struct resource *res;
2556 	u32 val;
2557 
2558 	/* Global registers */
2559 	geth = devm_kzalloc(dev, sizeof(*geth), GFP_KERNEL);
2560 	if (!geth)
2561 		return -ENOMEM;
2562 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2563 	if (!res)
2564 		return -ENODEV;
2565 	geth->base = devm_ioremap_resource(dev, res);
2566 	if (IS_ERR(geth->base))
2567 		return PTR_ERR(geth->base);
2568 	geth->dev = dev;
2569 
2570 	/* Wait for ports to stabilize */
2571 	do {
2572 		udelay(2);
2573 		val = readl(geth->base + GLOBAL_TOE_VERSION_REG);
2574 		barrier();
2575 	} while (!val && --retry);
2576 	if (!retry) {
2577 		dev_err(dev, "failed to reset ethernet\n");
2578 		return -EIO;
2579 	}
2580 	dev_info(dev, "Ethernet device ID: 0x%03x, revision 0x%01x\n",
2581 		 (val >> 4) & 0xFFFU, val & 0xFU);
2582 
2583 	spin_lock_init(&geth->irq_lock);
2584 	spin_lock_init(&geth->freeq_lock);
2585 
2586 	/* The children will use this */
2587 	platform_set_drvdata(pdev, geth);
2588 
2589 	/* Spawn child devices for the two ports */
2590 	return devm_of_platform_populate(dev);
2591 }
2592 
2593 static int gemini_ethernet_remove(struct platform_device *pdev)
2594 {
2595 	struct gemini_ethernet *geth = platform_get_drvdata(pdev);
2596 
2597 	geth_cleanup_freeq(geth);
2598 	geth->initialized = false;
2599 
2600 	return 0;
2601 }
2602 
2603 static const struct of_device_id gemini_ethernet_of_match[] = {
2604 	{
2605 		.compatible = "cortina,gemini-ethernet",
2606 	},
2607 	{},
2608 };
2609 MODULE_DEVICE_TABLE(of, gemini_ethernet_of_match);
2610 
2611 static struct platform_driver gemini_ethernet_driver = {
2612 	.driver = {
2613 		.name = DRV_NAME,
2614 		.of_match_table = of_match_ptr(gemini_ethernet_of_match),
2615 	},
2616 	.probe = gemini_ethernet_probe,
2617 	.remove = gemini_ethernet_remove,
2618 };
2619 
2620 static int __init gemini_ethernet_module_init(void)
2621 {
2622 	int ret;
2623 
2624 	ret = platform_driver_register(&gemini_ethernet_port_driver);
2625 	if (ret)
2626 		return ret;
2627 
2628 	ret = platform_driver_register(&gemini_ethernet_driver);
2629 	if (ret) {
2630 		platform_driver_unregister(&gemini_ethernet_port_driver);
2631 		return ret;
2632 	}
2633 
2634 	return 0;
2635 }
2636 module_init(gemini_ethernet_module_init);
2637 
2638 static void __exit gemini_ethernet_module_exit(void)
2639 {
2640 	platform_driver_unregister(&gemini_ethernet_driver);
2641 	platform_driver_unregister(&gemini_ethernet_port_driver);
2642 }
2643 module_exit(gemini_ethernet_module_exit);
2644 
2645 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
2646 MODULE_DESCRIPTION("StorLink SL351x (Gemini) ethernet driver");
2647 MODULE_LICENSE("GPL");
2648 MODULE_ALIAS("platform:" DRV_NAME);
2649